diff options
Diffstat (limited to 'thirdparty/thorvg/src/loaders')
| -rw-r--r-- | thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.cpp | 164 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.h | 52 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/png/tvgLodePng.cpp | 2647 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/png/tvgLodePng.h | 174 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/png/tvgPngLoader.cpp | 194 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/png/tvgPngLoader.h | 54 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp | 6 | ||||
| -rw-r--r-- | thirdparty/thorvg/src/loaders/tvg/tvgTvgBinInterpreter.cpp | 4 |
8 files changed, 5 insertions, 3290 deletions
diff --git a/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.cpp b/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.cpp deleted file mode 100644 index 522c3c71a6..0000000000 --- a/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.cpp +++ /dev/null @@ -1,164 +0,0 @@ -/* - * Copyright (c) 2021 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ - -#include <memory.h> -#include <turbojpeg.h> -#include "tvgLoader.h" -#include "tvgJpgLoader.h" - -/************************************************************************/ -/* Internal Class Implementation */ -/************************************************************************/ - -void JpgLoader::clear() -{ - if (freeData) free(data); - data = nullptr; - size = 0; - freeData = false; -} - -/************************************************************************/ -/* External Class Implementation */ -/************************************************************************/ - -JpgLoader::JpgLoader() -{ - jpegDecompressor = tjInitDecompress(); -} - - -JpgLoader::~JpgLoader() -{ - if (freeData) free(data); - tjDestroy(jpegDecompressor); - - //This image is shared with raster engine. - tjFree(image); -} - - -bool JpgLoader::open(const string& path) -{ - clear(); - - auto jpegFile = fopen(path.c_str(), "rb"); - if (!jpegFile) return false; - - auto ret = false; - - //determine size - if (fseek(jpegFile, 0, SEEK_END) < 0) goto finalize; - if (((size = ftell(jpegFile)) < 1)) goto finalize; - if (fseek(jpegFile, 0, SEEK_SET)) goto finalize; - - data = (unsigned char *) malloc(size); - if (!data) goto finalize; - - freeData = true; - - if (fread(data, size, 1, jpegFile) < 1) goto failure; - - int width, height, subSample, colorSpace; - if (tjDecompressHeader3(jpegDecompressor, data, size, &width, &height, &subSample, &colorSpace) < 0) { - TVGERR("JPG LOADER", "%s", tjGetErrorStr()); - goto failure; - } - - w = static_cast<float>(width); - h = static_cast<float>(height); - ret = true; - - goto finalize; - -failure: - clear(); - -finalize: - fclose(jpegFile); - return ret; -} - - -bool JpgLoader::open(const char* data, uint32_t size, bool copy) -{ - clear(); - - int width, height, subSample, colorSpace; - if (tjDecompressHeader3(jpegDecompressor, (unsigned char *) data, size, &width, &height, &subSample, &colorSpace) < 0) return false; - - if (copy) { - this->data = (unsigned char *) malloc(size); - if (!this->data) return false; - memcpy((unsigned char *)this->data, data, size); - freeData = true; - } else { - this->data = (unsigned char *) data; - freeData = false; - } - - w = static_cast<float>(width); - h = static_cast<float>(height); - this->size = size; - - return true; -} - - -bool JpgLoader::read() -{ - if (image) tjFree(image); - image = (unsigned char *)tjAlloc(static_cast<int>(w) * static_cast<int>(h) * tjPixelSize[TJPF_BGRX]); - if (!image) return false; - - //decompress jpg image - if (tjDecompress2(jpegDecompressor, data, size, image, static_cast<int>(w), 0, static_cast<int>(h), TJPF_BGRX, 0) < 0) { - TVGERR("JPG LOADER", "%s", tjGetErrorStr()); - tjFree(image); - image = nullptr; - return false; - } - - return true; -} - - -bool JpgLoader::close() -{ - clear(); - return true; -} - - -unique_ptr<Surface> JpgLoader::bitmap() -{ - if (!image) return nullptr; - - auto surface = static_cast<Surface*>(malloc(sizeof(Surface))); - surface->buffer = (uint32_t*)(image); - surface->stride = w; - surface->w = w; - surface->h = h; - surface->cs = SwCanvas::ARGB8888; - - return unique_ptr<Surface>(surface); -} diff --git a/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.h b/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.h deleted file mode 100644 index 3f82af8003..0000000000 --- a/thirdparty/thorvg/src/loaders/external_jpg/tvgJpgLoader.h +++ /dev/null @@ -1,52 +0,0 @@ -/* - * Copyright (c) 2021 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ -#ifndef _TVG_JPG_LOADER_H_ -#define _TVG_JPG_LOADER_H_ - -using tjhandle = void*; - -//TODO: Use Task? -class JpgLoader : public LoadModule -{ -public: - JpgLoader(); - ~JpgLoader(); - - using LoadModule::open; - bool open(const string& path) override; - bool open(const char* data, uint32_t size, bool copy) override; - bool read() override; - bool close() override; - - unique_ptr<Surface> bitmap() override; - -private: - void clear(); - - tjhandle jpegDecompressor; - unsigned char* data = nullptr; - unsigned char *image = nullptr; - unsigned long size = 0; - bool freeData = false; -}; - -#endif //_TVG_JPG_LOADER_H_ diff --git a/thirdparty/thorvg/src/loaders/png/tvgLodePng.cpp b/thirdparty/thorvg/src/loaders/png/tvgLodePng.cpp deleted file mode 100644 index eaed025c54..0000000000 --- a/thirdparty/thorvg/src/loaders/png/tvgLodePng.cpp +++ /dev/null @@ -1,2647 +0,0 @@ -/* - * Copyright (c) 2020 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ - -/* - LodePNG version 20200306 - - Copyright (c) 2005-2020 Lode Vandevenne - - This software is provided 'as-is', without any express or implied - warranty. In no event will the authors be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - - 3. This notice may not be removed or altered from any sourcedistribution. -*/ - -#include <cstdlib> -#include "tvgLodePng.h" - - -/************************************************************************/ -/* Internal Class Implementation */ -/************************************************************************/ - -#if defined(_MSC_VER) && (_MSC_VER >= 1310) /*Visual Studio: A few warning types are not desired here.*/ - #pragma warning( disable : 4244 ) /*implicit conversions: not warned by gcc -Wall -Wextra and requires too much casts*/ - #pragma warning( disable : 4996 ) /*VS does not like fopen, but fopen_s is not standard C so unusable here*/ -#endif /*_MSC_VER */ - - -/* convince the compiler to inline a function, for use when this measurably improves performance */ -/* inline is not available in C90, but use it when supported by the compiler */ -#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || (defined(__cplusplus) && (__cplusplus >= 199711L)) - #define LODEPNG_INLINE inline -#else - #define LODEPNG_INLINE /* not available */ -#endif - -/* restrict is not available in C90, but use it when supported by the compiler */ -#if (defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))) ||\ - (defined(_MSC_VER) && (_MSC_VER >= 1400)) || \ - (defined(__WATCOMC__) && (__WATCOMC__ >= 1250) && !defined(__cplusplus)) - #define LODEPNG_RESTRICT __restrict -#else - #define LODEPNG_RESTRICT /* not available */ -#endif - -#define LODEPNG_MAX(a, b) (((a) > (b)) ? (a) : (b)) -#define LODEPNG_MIN(a, b) (((a) < (b)) ? (a) : (b)) -#define LODEPNG_ABS(x) ((x) < 0 ? -(x) : (x)) - - -/* Replacements for C library functions such as memcpy and strlen, to support platforms -where a full C library is not available. The compiler can recognize them and compile -to something as fast. */ - -static void lodepng_memcpy(void* LODEPNG_RESTRICT dst, const void* LODEPNG_RESTRICT src, size_t size) -{ - size_t i; - for (i = 0; i < size; i++) ((char*)dst)[i] = ((const char*)src)[i]; -} - - -static void lodepng_memset(void* LODEPNG_RESTRICT dst, int value, size_t num) -{ - size_t i; - for (i = 0; i < num; i++) ((char*)dst)[i] = (char)value; -} - - -/* does not check memory out of bounds, do not use on untrusted data */ -static size_t lodepng_strlen(const char* a) -{ - const char* orig = a; - /* avoid warning about unused function in case of disabled COMPILE... macros */ - (void)(&lodepng_strlen); - while (*a) a++; - return (size_t)(a - orig); -} - - -/* Safely check if adding two integers will overflow (no undefined -behavior, compiler removing the code, etc...) and output result. */ -static int lodepng_addofl(size_t a, size_t b, size_t* result) -{ - *result = a + b; /* Unsigned addition is well defined and safe in C90 */ - return *result < a; -} - - -/* Safely check if multiplying two integers will overflow (no undefined -behavior, compiler removing the code, etc...) and output result. */ -static int lodepng_mulofl(size_t a, size_t b, size_t* result) -{ - *result = a * b; /* Unsigned multiplication is well defined and safe in C90 */ - return (a != 0 && *result / a != b); -} - - -/* Safely check if a + b > c, even if overflow could happen. */ -static int lodepng_gtofl(size_t a, size_t b, size_t c) -{ - size_t d; - if (lodepng_addofl(a, b, &d)) return 1; - return d > c; -} - - -/* - Often in case of an error a value is assigned to a variable and then it breaks - out of a loop (to go to the cleanup phase of a function). This macro does that. - It makes the error handling code shorter and more readable. - - Example: if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83); -*/ -#define CERROR_BREAK(errorvar, code){\ - errorvar = code;\ - break;\ -} - -/* version of CERROR_BREAK that assumes the common case where the error variable is named "error" */ -#define ERROR_BREAK(code) CERROR_BREAK(error, code) - -/* Set error var to the error code, and return it.*/ -#define CERROR_RETURN_ERROR(errorvar, code){\ - errorvar = code;\ - return code;\ -} - -/* Try the code, if it returns error, also return the error. */ -#define CERROR_TRY_RETURN(call){\ - unsigned error = call;\ - if(error) return error;\ -} - -/* Set error var to the error code, and return from the void function. */ -#define CERROR_RETURN(errorvar, code){\ - errorvar = code;\ - return;\ -} - - -/* dynamic vector of unsigned chars */ -struct ucvector -{ - unsigned char* data; - size_t size; /*used size*/ - size_t allocsize; /*allocated size*/ -}; - - -/* returns 1 if success, 0 if failure ==> nothing done */ -static unsigned ucvector_resize(ucvector* p, size_t size) -{ - if (size > p->allocsize) { - size_t newsize = size + (p->allocsize >> 1u); - void* data = realloc(p->data, newsize); - if(data) { - p->allocsize = newsize; - p->data = (unsigned char*)data; - } - else return 0; /*error: not enough memory*/ - } - p->size = size; - return 1; /*success*/ -} - - -static ucvector ucvector_init(unsigned char* buffer, size_t size) -{ - ucvector v; - v.data = buffer; - v.allocsize = v.size = size; - return v; -} - - -static unsigned lodepng_read32bitInt(const unsigned char* buffer) -{ - return (((unsigned)buffer[0] << 24u) | ((unsigned)buffer[1] << 16u) | ((unsigned)buffer[2] << 8u) | (unsigned)buffer[3]); -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* // End of common code and tools. Begin of Zlib related code. // */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ - -struct LodePNGBitReader -{ - const unsigned char* data; - size_t size; /*size of data in bytes*/ - size_t bitsize; /*size of data in bits, end of valid bp values, should be 8*size*/ - size_t bp; - unsigned buffer; /*buffer for reading bits. NOTE: 'unsigned' must support at least 32 bits*/ -}; - - -/* data size argument is in bytes. Returns error if size too large causing overflow */ -static unsigned LodePNGBitReader_init(LodePNGBitReader* reader, const unsigned char* data, size_t size) -{ - size_t temp; - reader->data = data; - reader->size = size; - /* size in bits, return error if overflow (if size_t is 32 bit this supports up to 500MB) */ - if (lodepng_mulofl(size, 8u, &reader->bitsize)) return 105; - /*ensure incremented bp can be compared to bitsize without overflow even when it would be incremented 32 too much and - trying to ensure 32 more bits*/ - if (lodepng_addofl(reader->bitsize, 64u, &temp)) return 105; - reader->bp = 0; - reader->buffer = 0; - return 0; /*ok*/ - } - -/* - ensureBits functions: - Ensures the reader can at least read nbits bits in one or more readBits calls, - safely even if not enough bits are available. - Returns 1 if there are enough bits available, 0 if not. -*/ - -/*See ensureBits documentation above. This one ensures exactly 1 bit */ -/*static unsigned ensureBits1(LodePNGBitReader* reader) { - if(reader->bp >= reader->bitsize) return 0; - reader->buffer = (unsigned)reader->data[reader->bp >> 3u] >> (reader->bp & 7u); - return 1; -}*/ - -/*See ensureBits documentation above. This one ensures up to 9 bits */ -static unsigned ensureBits9(LodePNGBitReader* reader, size_t nbits) -{ - size_t start = reader->bp >> 3u; - size_t size = reader->size; - if (start + 1u < size) { - reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u); - reader->buffer >>= (reader->bp & 7u); - return 1; - } else { - reader->buffer = 0; - if (start + 0u < size) reader->buffer |= reader->data[start + 0]; - reader->buffer >>= (reader->bp & 7u); - return reader->bp + nbits <= reader->bitsize; - } -} - - -/*See ensureBits documentation above. This one ensures up to 17 bits */ -static unsigned ensureBits17(LodePNGBitReader* reader, size_t nbits) -{ - size_t start = reader->bp >> 3u; - size_t size = reader->size; - if (start + 2u < size) { - reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | ((unsigned)reader->data[start + 2] << 16u); - reader->buffer >>= (reader->bp & 7u); - return 1; - } else { - reader->buffer = 0; - if (start + 0u < size) reader->buffer |= reader->data[start + 0]; - if (start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); - reader->buffer >>= (reader->bp & 7u); - return reader->bp + nbits <= reader->bitsize; - } -} - - -/*See ensureBits documentation above. This one ensures up to 25 bits */ -static LODEPNG_INLINE unsigned ensureBits25(LodePNGBitReader* reader, size_t nbits) -{ - size_t start = reader->bp >> 3u; - size_t size = reader->size; - if (start + 3u < size) { - reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u); - reader->buffer >>= (reader->bp & 7u); - return 1; - } else { - reader->buffer = 0; - if (start + 0u < size) reader->buffer |= reader->data[start + 0]; - if (start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); - if (start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u); - reader->buffer >>= (reader->bp & 7u); - return reader->bp + nbits <= reader->bitsize; - } -} - - -/*See ensureBits documentation above. This one ensures up to 32 bits */ -static LODEPNG_INLINE unsigned ensureBits32(LodePNGBitReader* reader, size_t nbits) -{ - size_t start = reader->bp >> 3u; - size_t size = reader->size; - if(start + 4u < size) { - reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u); - reader->buffer >>= (reader->bp & 7u); - reader->buffer |= (((unsigned)reader->data[start + 4] << 24u) << (8u - (reader->bp & 7u))); - return 1; - } else { - reader->buffer = 0; - if (start + 0u < size) reader->buffer |= reader->data[start + 0]; - if (start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); - if (start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u); - if (start + 3u < size) reader->buffer |= ((unsigned)reader->data[start + 3] << 24u); - reader->buffer >>= (reader->bp & 7u); - return reader->bp + nbits <= reader->bitsize; - } -} - - -/* Get bits without advancing the bit pointer. Must have enough bits available with ensureBits. Max nbits is 31. */ -static unsigned peekBits(LodePNGBitReader* reader, size_t nbits) -{ - /* The shift allows nbits to be only up to 31. */ - return reader->buffer & ((1u << nbits) - 1u); -} - - -/* Must have enough bits available with ensureBits */ -static void advanceBits(LodePNGBitReader* reader, size_t nbits) -{ - reader->buffer >>= nbits; - reader->bp += nbits; -} - - -/* Must have enough bits available with ensureBits */ -static unsigned readBits(LodePNGBitReader* reader, size_t nbits) -{ - unsigned result = peekBits(reader, nbits); - advanceBits(reader, nbits); - return result; -} - - -/* Public for testing only. steps and result must have numsteps values. */ -unsigned lode_png_test_bitreader(const unsigned char* data, size_t size, size_t numsteps, const size_t* steps, unsigned* result) -{ - size_t i; - LodePNGBitReader reader; - unsigned error = LodePNGBitReader_init(&reader, data, size); - if (error) return 0; - for (i = 0; i < numsteps; i++) { - size_t step = steps[i]; - unsigned ok; - if (step > 25) ok = ensureBits32(&reader, step); - else if (step > 17) ok = ensureBits25(&reader, step); - else if (step > 9) ok = ensureBits17(&reader, step); - else ok = ensureBits9(&reader, step); - if (!ok) return 0; - result[i] = readBits(&reader, step); - } - return 1; -} - - -static unsigned reverseBits(unsigned bits, unsigned num) -{ - /*TODO: implement faster lookup table based version when needed*/ - unsigned i, result = 0; - for (i = 0; i < num; i++) result |= ((bits >> (num - i - 1u)) & 1u) << i; - return result; -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Deflate - Huffman / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -#define FIRST_LENGTH_CODE_INDEX 257 -#define LAST_LENGTH_CODE_INDEX 285 -/*256 literals, the end code, some length codes, and 2 unused codes*/ -#define NUM_DEFLATE_CODE_SYMBOLS 288 -/*the distance codes have their own symbols, 30 used, 2 unused*/ -#define NUM_DISTANCE_SYMBOLS 32 -/*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/ -#define NUM_CODE_LENGTH_CODES 19 - -/*the base lengths represented by codes 257-285*/ -static const unsigned LENGTHBASE[29] - = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, - 67, 83, 99, 115, 131, 163, 195, 227, 258}; - -/*the extra bits used by codes 257-285 (added to base length)*/ -static const unsigned LENGTHEXTRA[29] - = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, - 4, 4, 4, 4, 5, 5, 5, 5, 0}; - -/*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/ -static const unsigned DISTANCEBASE[30] - = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, - 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; - -/*the extra bits of backwards distances (added to base)*/ -static const unsigned DISTANCEEXTRA[30] - = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, - 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; - -/*the order in which "code length alphabet code lengths" are stored as specified by deflate, out of this the huffman -tree of the dynamic huffman tree lengths is generated*/ -static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES] - = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; - -/* ////////////////////////////////////////////////////////////////////////// */ - -/* -Huffman tree struct, containing multiple representations of the tree -*/ -struct HuffmanTree -{ - unsigned* codes; /*the huffman codes (bit patterns representing the symbols)*/ - unsigned* lengths; /*the lengths of the huffman codes*/ - unsigned maxbitlen; /*maximum number of bits a single code can get*/ - unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ - /* for reading only */ - unsigned char* table_len; /*length of symbol from lookup table, or max length if secondary lookup needed*/ - unsigned short* table_value; /*value of symbol from lookup table, or pointer to secondary table if needed*/ -}; - - -static void HuffmanTree_init(HuffmanTree* tree) -{ - tree->codes = 0; - tree->lengths = 0; - tree->table_len = 0; - tree->table_value = 0; -} - - -static void HuffmanTree_cleanup(HuffmanTree* tree) -{ - free(tree->codes); - free(tree->lengths); - free(tree->table_len); - free(tree->table_value); -} - - -/* amount of bits for first huffman table lookup (aka root bits), see HuffmanTree_makeTable and huffmanDecodeSymbol.*/ -/* values 8u and 9u work the fastest */ -#define FIRSTBITS 9u - -/* a symbol value too big to represent any valid symbol, to indicate reading disallowed huffman bits combination, -which is possible in case of only 0 or 1 present symbols. */ -#define INVALIDSYMBOL 65535u - -/* make table for huffman decoding */ -static unsigned HuffmanTree_makeTable(HuffmanTree* tree) -{ - static const unsigned headsize = 1u << FIRSTBITS; /*size of the first table*/ - static const unsigned mask = (1u << FIRSTBITS) /*headsize*/ - 1u; - size_t i, numpresent, pointer, size; /*total table size*/ - unsigned* maxlens = (unsigned*)malloc(headsize * sizeof(unsigned)); - if (!maxlens) return 83; /*alloc fail*/ - - /* compute maxlens: max total bit length of symbols sharing prefix in the first table*/ - lodepng_memset(maxlens, 0, headsize * sizeof(*maxlens)); - for (i = 0; i < tree->numcodes; i++) { - unsigned symbol = tree->codes[i]; - unsigned l = tree->lengths[i]; - unsigned index; - if(l <= FIRSTBITS) continue; /*symbols that fit in first table don't increase secondary table size*/ - /*get the FIRSTBITS MSBs, the MSBs of the symbol are encoded first. See later comment about the reversing*/ - index = reverseBits(symbol >> (l - FIRSTBITS), FIRSTBITS); - maxlens[index] = LODEPNG_MAX(maxlens[index], l); - } - /* compute total table size: size of first table plus all secondary tables for symbols longer than FIRSTBITS */ - size = headsize; - for (i = 0; i < headsize; ++i) { - unsigned l = maxlens[i]; - if (l > FIRSTBITS) size += (1u << (l - FIRSTBITS)); - } - tree->table_len = (unsigned char*)malloc(size * sizeof(*tree->table_len)); - tree->table_value = (unsigned short*)malloc(size * sizeof(*tree->table_value)); - if (!tree->table_len || !tree->table_value) { - free(maxlens); - /* freeing tree->table values is done at a higher scope */ - return 83; /*alloc fail*/ - } - /*initialize with an invalid length to indicate unused entries*/ - for (i = 0; i < size; ++i) tree->table_len[i] = 16; - - /*fill in the first table for long symbols: max prefix size and pointer to secondary tables*/ - pointer = headsize; - for (i = 0; i < headsize; ++i) { - unsigned l = maxlens[i]; - if(l <= FIRSTBITS) continue; - tree->table_len[i] = l; - tree->table_value[i] = pointer; - pointer += (1u << (l - FIRSTBITS)); - } - free(maxlens); - - /*fill in the first table for short symbols, or secondary table for long symbols*/ - numpresent = 0; - for (i = 0; i < tree->numcodes; ++i) { - unsigned l = tree->lengths[i]; - unsigned symbol = tree->codes[i]; /*the huffman bit pattern. i itself is the value.*/ - /*reverse bits, because the huffman bits are given in MSB first order but the bit reader reads LSB first*/ - unsigned reverse = reverseBits(symbol, l); - if (l == 0) continue; - numpresent++; - - if (l <= FIRSTBITS) { - /*short symbol, fully in first table, replicated num times if l < FIRSTBITS*/ - unsigned num = 1u << (FIRSTBITS - l); - unsigned j; - for (j = 0; j < num; ++j) { - /*bit reader will read the l bits of symbol first, the remaining FIRSTBITS - l bits go to the MSB's*/ - unsigned index = reverse | (j << l); - if(tree->table_len[index] != 16) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ - tree->table_len[index] = l; - tree->table_value[index] = i; - } - } else { - /*long symbol, shares prefix with other long symbols in first lookup table, needs second lookup*/ - /*the FIRSTBITS MSBs of the symbol are the first table index*/ - unsigned index = reverse & mask; - unsigned maxlen = tree->table_len[index]; - /*log2 of secondary table length, should be >= l - FIRSTBITS*/ - unsigned tablelen = maxlen - FIRSTBITS; - unsigned start = tree->table_value[index]; /*starting index in secondary table*/ - unsigned num = 1u << (tablelen - (l - FIRSTBITS)); /*amount of entries of this symbol in secondary table*/ - unsigned j; - if (maxlen < l) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ - for (j = 0; j < num; ++j) { - unsigned reverse2 = reverse >> FIRSTBITS; /* l - FIRSTBITS bits */ - unsigned index2 = start + (reverse2 | (j << (l - FIRSTBITS))); - tree->table_len[index2] = l; - tree->table_value[index2] = i; - } - } - } - - if (numpresent < 2) { - /* In case of exactly 1 symbol, in theory the huffman symbol needs 0 bits, - but deflate uses 1 bit instead. In case of 0 symbols, no symbols can - appear at all, but such huffman tree could still exist (e.g. if distance - codes are never used). In both cases, not all symbols of the table will be - filled in. Fill them in with an invalid symbol value so returning them from - huffmanDecodeSymbol will cause error. */ - for (i = 0; i < size; ++i) { - if (tree->table_len[i] == 16) { - /* As length, use a value smaller than FIRSTBITS for the head table, - and a value larger than FIRSTBITS for the secondary table, to ensure - valid behavior for advanceBits when reading this symbol. */ - tree->table_len[i] = (i < headsize) ? 1 : (FIRSTBITS + 1); - tree->table_value[i] = INVALIDSYMBOL; - } - } - } else { - /* A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. - If that is not the case (due to too long length codes), the table will not - have been fully used, and this is an error (not all bit combinations can be - decoded): an oversubscribed huffman tree, indicated by error 55. */ - for (i = 0; i < size; ++i) { - if (tree->table_len[i] == 16) return 55; - } - } - return 0; -} - - -/* - Second step for the ...makeFromLengths and ...makeFromFrequencies functions. - numcodes, lengths and maxbitlen must already be filled in correctly. return - value is error. -*/ -static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) -{ - unsigned* blcount; - unsigned* nextcode; - unsigned error = 0; - unsigned bits, n; - - tree->codes = (unsigned*)malloc(tree->numcodes * sizeof(unsigned)); - blcount = (unsigned*)malloc((tree->maxbitlen + 1) * sizeof(unsigned)); - nextcode = (unsigned*)malloc((tree->maxbitlen + 1) * sizeof(unsigned)); - if (!tree->codes || !blcount || !nextcode) error = 83; /*alloc fail*/ - - if (!error) { - for (n = 0; n != tree->maxbitlen + 1; n++) blcount[n] = nextcode[n] = 0; - /*step 1: count number of instances of each code length*/ - for (bits = 0; bits != tree->numcodes; ++bits) ++blcount[tree->lengths[bits]]; - /*step 2: generate the nextcode values*/ - for(bits = 1; bits <= tree->maxbitlen; ++bits) { - nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1u; - } - /*step 3: generate all the codes*/ - for (n = 0; n != tree->numcodes; ++n) { - if (tree->lengths[n] != 0) { - tree->codes[n] = nextcode[tree->lengths[n]]++; - /*remove superfluous bits from the code*/ - tree->codes[n] &= ((1u << tree->lengths[n]) - 1u); - } - } - } - - free(blcount); - free(nextcode); - - if (!error) error = HuffmanTree_makeTable(tree); - return error; -} - - -/* - given the code lengths (as stored in the PNG file), generate the tree as defined - by Deflate. maxbitlen is the maximum bits that a code in the tree can have. - return value is error. -*/ -static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, size_t numcodes, unsigned maxbitlen) -{ - unsigned i; - tree->lengths = (unsigned*)malloc(numcodes * sizeof(unsigned)); - if (!tree->lengths) return 83; /*alloc fail*/ - for (i = 0; i != numcodes; ++i) tree->lengths[i] = bitlen[i]; - tree->numcodes = (unsigned)numcodes; /*number of symbols*/ - tree->maxbitlen = maxbitlen; - return HuffmanTree_makeFromLengths2(tree); -} - - -/*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/ -static unsigned generateFixedLitLenTree(HuffmanTree* tree) -{ - unsigned i, error = 0; - unsigned* bitlen = (unsigned*)malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); - if (!bitlen) return 83; /*alloc fail*/ - - /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ - for (i = 0; i <= 143; ++i) bitlen[i] = 8; - for (i = 144; i <= 255; ++i) bitlen[i] = 9; - for (i = 256; i <= 279; ++i) bitlen[i] = 7; - for (i = 280; i <= 287; ++i) bitlen[i] = 8; - - error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15); - - free(bitlen); - return error; -} - - -/*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/ -static unsigned generateFixedDistanceTree(HuffmanTree* tree) -{ - unsigned i, error = 0; - unsigned* bitlen = (unsigned*)malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); - if (!bitlen) return 83; /*alloc fail*/ - - /*there are 32 distance codes, but 30-31 are unused*/ - for (i = 0; i != NUM_DISTANCE_SYMBOLS; ++i) bitlen[i] = 5; - error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DISTANCE_SYMBOLS, 15); - - free(bitlen); - return error; -} - - -/* - returns the code. The bit reader must already have been ensured at least 15 bits -*/ -static unsigned huffmanDecodeSymbol(LodePNGBitReader* reader, const HuffmanTree* codetree) -{ - unsigned short code = peekBits(reader, FIRSTBITS); - unsigned short l = codetree->table_len[code]; - unsigned short value = codetree->table_value[code]; - if (l <= FIRSTBITS) { - advanceBits(reader, l); - return value; - } else { - unsigned index2; - advanceBits(reader, FIRSTBITS); - index2 = value + peekBits(reader, l - FIRSTBITS); - advanceBits(reader, codetree->table_len[index2] - FIRSTBITS); - return codetree->table_value[index2]; - } -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Inflator (Decompressor) / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*get the tree of a deflated block with fixed tree, as specified in the deflate specification -Returns error code.*/ -static unsigned getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) -{ - unsigned error = generateFixedLitLenTree(tree_ll); - if (error) return error; - return generateFixedDistanceTree(tree_d); -} - - -/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ -static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, LodePNGBitReader* reader) -{ - /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ - unsigned error = 0; - unsigned n, HLIT, HDIST, HCLEN, i; - - /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/ - unsigned* bitlen_ll = 0; /*lit,len code lengths*/ - unsigned* bitlen_d = 0; /*dist code lengths*/ - /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/ - unsigned* bitlen_cl = 0; - HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/ - - if (!ensureBits17(reader, 14)) return 49; /*error: the bit pointer is or will go past the memory*/ - - /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ - HLIT = readBits(reader, 5) + 257; - /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ - HDIST = readBits(reader, 5) + 1; - /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ - HCLEN = readBits(reader, 4) + 4; - - bitlen_cl = (unsigned*)malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned)); - if(!bitlen_cl) return 83 /*alloc fail*/; - - HuffmanTree_init(&tree_cl); - - while (!error) { - /*read the code length codes out of 3 * (amount of code length codes) bits*/ - if (lodepng_gtofl(reader->bp, HCLEN * 3, reader->bitsize)) { - ERROR_BREAK(50); /*error: the bit pointer is or will go past the memory*/ - } - for (i = 0; i != HCLEN; ++i) { - ensureBits9(reader, 3); /*out of bounds already checked above */ - bitlen_cl[CLCL_ORDER[i]] = readBits(reader, 3); - } - for (i = HCLEN; i != NUM_CODE_LENGTH_CODES; ++i) { - bitlen_cl[CLCL_ORDER[i]] = 0; - } - - error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7); - if(error) break; - - /*now we can use this tree to read the lengths for the tree that this function will return*/ - bitlen_ll = (unsigned*)malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); - bitlen_d = (unsigned*)malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); - if (!bitlen_ll || !bitlen_d) ERROR_BREAK(83 /*alloc fail*/); - lodepng_memset(bitlen_ll, 0, NUM_DEFLATE_CODE_SYMBOLS * sizeof(*bitlen_ll)); - lodepng_memset(bitlen_d, 0, NUM_DISTANCE_SYMBOLS * sizeof(*bitlen_d)); - - /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/ - i = 0; - while (i < HLIT + HDIST) { - unsigned code; - ensureBits25(reader, 22); /* up to 15 bits for huffman code, up to 7 extra bits below*/ - code = huffmanDecodeSymbol(reader, &tree_cl); - if (code <= 15) /*a length code*/ { - if (i < HLIT) bitlen_ll[i] = code; - else bitlen_d[i - HLIT] = code; - ++i; - } else if (code == 16) /*repeat previous*/ { - unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ - unsigned value; /*set value to the previous code*/ - - if (i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/ - - replength += readBits(reader, 2); - - if (i < HLIT + 1) value = bitlen_ll[i - 1]; - else value = bitlen_d[i - HLIT - 1]; - /*repeat this value in the next lengths*/ - for (n = 0; n < replength; ++n) { - if (i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/ - if (i < HLIT) bitlen_ll[i] = value; - else bitlen_d[i - HLIT] = value; - ++i; - } - } else if(code == 17) /*repeat "0" 3-10 times*/ { - unsigned replength = 3; /*read in the bits that indicate repeat length*/ - replength += readBits(reader, 3); - - /*repeat this value in the next lengths*/ - for (n = 0; n < replength; ++n) { - if (i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/ - - if (i < HLIT) bitlen_ll[i] = 0; - else bitlen_d[i - HLIT] = 0; - ++i; - } - } else if(code == 18) /*repeat "0" 11-138 times*/ { - unsigned replength = 11; /*read in the bits that indicate repeat length*/ - replength += readBits(reader, 7); - - /*repeat this value in the next lengths*/ - for (n = 0; n < replength; ++n) { - if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/ - - if(i < HLIT) bitlen_ll[i] = 0; - else bitlen_d[i - HLIT] = 0; - ++i; - } - } else /*if(code == INVALIDSYMBOL)*/ { - ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ - } - /*check if any of the ensureBits above went out of bounds*/ - if (reader->bp > reader->bitsize) { - /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol - (10=no endcode, 11=wrong jump outside of tree)*/ - /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ - ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ - } - } - if (error) break; - - if (bitlen_ll[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/ - - /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/ - error = HuffmanTree_makeFromLengths(tree_ll, bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 15); - if (error) break; - error = HuffmanTree_makeFromLengths(tree_d, bitlen_d, NUM_DISTANCE_SYMBOLS, 15); - - break; /*end of error-while*/ - } - - free(bitlen_cl); - free(bitlen_ll); - free(bitlen_d); - HuffmanTree_cleanup(&tree_cl); - - return error; -} - - -/*inflate a block with dynamic of fixed Huffman tree. btype must be 1 or 2.*/ -static unsigned inflateHuffmanBlock(ucvector* out, LodePNGBitReader* reader, unsigned btype) -{ - unsigned error = 0; - HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/ - HuffmanTree tree_d; /*the huffman tree for distance codes*/ - - HuffmanTree_init(&tree_ll); - HuffmanTree_init(&tree_d); - - if (btype == 1) error = getTreeInflateFixed(&tree_ll, &tree_d); - else /*if(btype == 2)*/ error = getTreeInflateDynamic(&tree_ll, &tree_d, reader); - - while (!error) /*decode all symbols until end reached, breaks at end code*/ { - /*code_ll is literal, length or end code*/ - unsigned code_ll; - ensureBits25(reader, 20); /* up to 15 for the huffman symbol, up to 5 for the length extra bits */ - code_ll = huffmanDecodeSymbol(reader, &tree_ll); - if (code_ll <= 255) /*literal symbol*/ { - if (!ucvector_resize(out, out->size + 1)) ERROR_BREAK(83 /*alloc fail*/); - out->data[out->size - 1] = (unsigned char)code_ll; - } else if (code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ { - unsigned code_d, distance; - unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/ - size_t start, backward, length; - - /*part 1: get length base*/ - length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX]; - - /*part 2: get extra bits and add the value of that to length*/ - numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX]; - if (numextrabits_l != 0) { - /* bits already ensured above */ - length += readBits(reader, numextrabits_l); - } - - /*part 3: get distance code*/ - ensureBits32(reader, 28); /* up to 15 for the huffman symbol, up to 13 for the extra bits */ - code_d = huffmanDecodeSymbol(reader, &tree_d); - if (code_d > 29) { - if (code_d <= 31) { - ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/ - } else /* if(code_d == INVALIDSYMBOL) */{ - ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ - } - } - distance = DISTANCEBASE[code_d]; - - /*part 4: get extra bits from distance*/ - numextrabits_d = DISTANCEEXTRA[code_d]; - if (numextrabits_d != 0) { - /* bits already ensured above */ - distance += readBits(reader, numextrabits_d); - } - - /*part 5: fill in all the out[n] values based on the length and dist*/ - start = out->size; - if (distance > start) ERROR_BREAK(52); /*too long backward distance*/ - backward = start - distance; - - if (!ucvector_resize(out, out->size + length)) ERROR_BREAK(83 /*alloc fail*/); - if (distance < length) { - size_t forward; - lodepng_memcpy(out->data + start, out->data + backward, distance); - start += distance; - for (forward = distance; forward < length; ++forward) { - out->data[start++] = out->data[backward++]; - } - } else { - lodepng_memcpy(out->data + start, out->data + backward, length); - } - } else if (code_ll == 256) { - break; /*end code, break the loop*/ - } else /*if(code_ll == INVALIDSYMBOL)*/ { - ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ - } - /*check if any of the ensureBits above went out of bounds*/ - if (reader->bp > reader->bitsize) { - /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol - (10=no endcode, 11=wrong jump outside of tree)*/ - /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ - ERROR_BREAK(51); /*error, bit pointer jumps past memory*/ - } - } - - HuffmanTree_cleanup(&tree_ll); - HuffmanTree_cleanup(&tree_d); - - return error; -} - - -static unsigned inflateNoCompression(ucvector* out, LodePNGBitReader* reader, const LodePNGDecompressSettings* settings) -{ - size_t bytepos; - size_t size = reader->size; - unsigned LEN, NLEN, error = 0; - - /*go to first boundary of byte*/ - bytepos = (reader->bp + 7u) >> 3u; - - /*read LEN (2 bytes) and NLEN (2 bytes)*/ - if (bytepos + 4 >= size) return 52; /*error, bit pointer will jump past memory*/ - LEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2; - NLEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2; - - /*check if 16-bit NLEN is really the one's complement of LEN*/ - if (!settings->ignore_nlen && LEN + NLEN != 65535) { - return 21; /*error: NLEN is not one's complement of LEN*/ - } - - if (!ucvector_resize(out, out->size + LEN)) return 83; /*alloc fail*/ - - /*read the literal data: LEN bytes are now stored in the out buffer*/ - if (bytepos + LEN > size) return 23; /*error: reading outside of in buffer*/ - - lodepng_memcpy(out->data + out->size - LEN, reader->data + bytepos, LEN); - bytepos += LEN; - - reader->bp = bytepos << 3u; - - return error; -} - - -static unsigned lodepng_inflatev(ucvector* out, const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) -{ - unsigned BFINAL = 0; - LodePNGBitReader reader; - unsigned error = LodePNGBitReader_init(&reader, in, insize); - - if (error) return error; - - while (!BFINAL) { - unsigned BTYPE; - if (!ensureBits9(&reader, 3)) return 52; /*error, bit pointer will jump past memory*/ - BFINAL = readBits(&reader, 1); - BTYPE = readBits(&reader, 2); - - if (BTYPE == 3) return 20; /*error: invalid BTYPE*/ - else if (BTYPE == 0) error = inflateNoCompression(out, &reader, settings); /*no compression*/ - else error = inflateHuffmanBlock(out, &reader, BTYPE); /*compression, BTYPE 01 or 10*/ - - if (error) return error; - } - - return error; -} - - -static unsigned inflatev(ucvector* out, const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) -{ - if (settings->custom_inflate) { - unsigned error = settings->custom_inflate(&out->data, &out->size, in, insize, settings); - out->allocsize = out->size; - return error; - } else { - return lodepng_inflatev(out, in, insize, settings); - } -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Adler32 / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) -{ - unsigned s1 = adler & 0xffffu; - unsigned s2 = (adler >> 16u) & 0xffffu; - - while (len != 0u) { - unsigned i; - /*at least 5552 sums can be done before the sums overflow, saving a lot of module divisions*/ - unsigned amount = len > 5552u ? 5552u : len; - len -= amount; - for (i = 0; i != amount; ++i) { - s1 += (*data++); - s2 += s1; - } - s1 %= 65521u; - s2 %= 65521u; - } - - return (s2 << 16u) | s1; -} - -/*Return the adler32 of the bytes data[0..len-1]*/ -static unsigned adler32(const unsigned char* data, unsigned len) -{ - return update_adler32(1u, data, len); -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Zlib / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned lodepng_zlib_decompressv(ucvector* out, const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) -{ - unsigned error = 0; - unsigned CM, CINFO, FDICT; - - if (insize < 2) return 53; /*error, size of zlib data too small*/ - /*read information from zlib header*/ - if ((in[0] * 256 + in[1]) % 31 != 0) { - /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ - return 24; - } - - CM = in[0] & 15; - CINFO = (in[0] >> 4) & 15; - /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/ - FDICT = (in[1] >> 5) & 1; - /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/ - - if (CM != 8 || CINFO > 7) { - /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ - return 25; - } - if (FDICT != 0) { - /*error: the specification of PNG says about the zlib stream: - "The additional flags shall not specify a preset dictionary."*/ - return 26; - } - - error = inflatev(out, in + 2, insize - 2, settings); - if (error) return error; - - if (!settings->ignore_adler32) { - unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]); - unsigned checksum = adler32(out->data, (unsigned)(out->size)); - if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/ - } - - return 0; /*no error*/ -} - - -/*expected_size is expected output size, to avoid intermediate allocations. Set to 0 if not known. */ -static unsigned zlib_decompress(unsigned char** out, size_t* outsize, size_t expected_size, const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) -{ - if(settings->custom_zlib) { - return settings->custom_zlib(out, outsize, in, insize, settings); - } else { - unsigned error; - ucvector v = ucvector_init(*out, *outsize); - if (expected_size) { - /*reserve the memory to avoid intermediate reallocations*/ - ucvector_resize(&v, *outsize + expected_size); - v.size = *outsize; - } - error = lodepng_zlib_decompressv(&v, in, insize, settings); - *out = v.data; - *outsize = v.size; - return error; - } -} - - -static void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) -{ - settings->ignore_adler32 = 0; - settings->ignore_nlen = 0; - settings->custom_zlib = 0; - settings->custom_inflate = 0; - settings->custom_context = 0; -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* // End of Zlib related code. Begin of PNG related code. // */ -/* ////////////////////////////////////////////////////////////////////////// */ -/* ////////////////////////////////////////////////////////////////////////// */ - - -#if 0 //thorvg don't use crc -/* CRC polynomial: 0xedb88320 */ -static unsigned lodepng_crc32_table[256] = { - 0u, 1996959894u, 3993919788u, 2567524794u, 124634137u, 1886057615u, 3915621685u, 2657392035u, - 249268274u, 2044508324u, 3772115230u, 2547177864u, 162941995u, 2125561021u, 3887607047u, 2428444049u, - 498536548u, 1789927666u, 4089016648u, 2227061214u, 450548861u, 1843258603u, 4107580753u, 2211677639u, - 325883990u, 1684777152u, 4251122042u, 2321926636u, 335633487u, 1661365465u, 4195302755u, 2366115317u, - 997073096u, 1281953886u, 3579855332u, 2724688242u, 1006888145u, 1258607687u, 3524101629u, 2768942443u, - 901097722u, 1119000684u, 3686517206u, 2898065728u, 853044451u, 1172266101u, 3705015759u, 2882616665u, - 651767980u, 1373503546u, 3369554304u, 3218104598u, 565507253u, 1454621731u, 3485111705u, 3099436303u, - 671266974u, 1594198024u, 3322730930u, 2970347812u, 795835527u, 1483230225u, 3244367275u, 3060149565u, - 1994146192u, 31158534u, 2563907772u, 4023717930u, 1907459465u, 112637215u, 2680153253u, 3904427059u, - 2013776290u, 251722036u, 2517215374u, 3775830040u, 2137656763u, 141376813u, 2439277719u, 3865271297u, - 1802195444u, 476864866u, 2238001368u, 4066508878u, 1812370925u, 453092731u, 2181625025u, 4111451223u, - 1706088902u, 314042704u, 2344532202u, 4240017532u, 1658658271u, 366619977u, 2362670323u, 4224994405u, - 1303535960u, 984961486u, 2747007092u, 3569037538u, 1256170817u, 1037604311u, 2765210733u, 3554079995u, - 1131014506u, 879679996u, 2909243462u, 3663771856u, 1141124467u, 855842277u, 2852801631u, 3708648649u, - 1342533948u, 654459306u, 3188396048u, 3373015174u, 1466479909u, 544179635u, 3110523913u, 3462522015u, - 1591671054u, 702138776u, 2966460450u, 3352799412u, 1504918807u, 783551873u, 3082640443u, 3233442989u, - 3988292384u, 2596254646u, 62317068u, 1957810842u, 3939845945u, 2647816111u, 81470997u, 1943803523u, - 3814918930u, 2489596804u, 225274430u, 2053790376u, 3826175755u, 2466906013u, 167816743u, 2097651377u, - 4027552580u, 2265490386u, 503444072u, 1762050814u, 4150417245u, 2154129355u, 426522225u, 1852507879u, - 4275313526u, 2312317920u, 282753626u, 1742555852u, 4189708143u, 2394877945u, 397917763u, 1622183637u, - 3604390888u, 2714866558u, 953729732u, 1340076626u, 3518719985u, 2797360999u, 1068828381u, 1219638859u, - 3624741850u, 2936675148u, 906185462u, 1090812512u, 3747672003u, 2825379669u, 829329135u, 1181335161u, - 3412177804u, 3160834842u, 628085408u, 1382605366u, 3423369109u, 3138078467u, 570562233u, 1426400815u, - 3317316542u, 2998733608u, 733239954u, 1555261956u, 3268935591u, 3050360625u, 752459403u, 1541320221u, - 2607071920u, 3965973030u, 1969922972u, 40735498u, 2617837225u, 3943577151u, 1913087877u, 83908371u, - 2512341634u, 3803740692u, 2075208622u, 213261112u, 2463272603u, 3855990285u, 2094854071u, 198958881u, - 2262029012u, 4057260610u, 1759359992u, 534414190u, 2176718541u, 4139329115u, 1873836001u, 414664567u, - 2282248934u, 4279200368u, 1711684554u, 285281116u, 2405801727u, 4167216745u, 1634467795u, 376229701u, - 2685067896u, 3608007406u, 1308918612u, 956543938u, 2808555105u, 3495958263u, 1231636301u, 1047427035u, - 2932959818u, 3654703836u, 1088359270u, 936918000u, 2847714899u, 3736837829u, 1202900863u, 817233897u, - 3183342108u, 3401237130u, 1404277552u, 615818150u, 3134207493u, 3453421203u, 1423857449u, 601450431u, - 3009837614u, 3294710456u, 1567103746u, 711928724u, 3020668471u, 3272380065u, 1510334235u, 755167117u -}; - - -/* Calculate CRC32 of buffer - Return the CRC of the bytes buf[0..len-1]. */ -static unsigned lodepng_crc32(const unsigned char* data, size_t length) -{ - unsigned r = 0xffffffffu; - size_t i; - for (i = 0; i < length; ++i) { - r = lodepng_crc32_table[(r ^ data[i]) & 0xffu] ^ (r >> 8u); - } - return r ^ 0xffffffffu; -} -#endif - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Reading and writing PNG color channel bits / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/* The color channel bits of less-than-8-bit pixels are read with the MSB of bytes first, -so LodePNGBitWriter and LodePNGBitReader can't be used for those. */ - -static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) -{ - unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); - ++(*bitpointer); - return result; -} - - -/* TODO: make this faster */ -static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) -{ - unsigned result = 0; - size_t i; - for (i = 0 ; i < nbits; ++i) { - result <<= 1u; - result |= (unsigned)readBitFromReversedStream(bitpointer, bitstream); - } - return result; -} - - -static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) -{ - /*the current bit in bitstream may be 0 or 1 for this to work*/ - if (bit == 0) bitstream[(*bitpointer) >> 3u] &= (unsigned char)(~(1u << (7u - ((*bitpointer) & 7u)))); - else bitstream[(*bitpointer) >> 3u] |= (1u << (7u - ((*bitpointer) & 7u))); - ++(*bitpointer); -} - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / PNG chunks / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/* - The lodepng_chunk functions are normally not needed, except to traverse the - unknown chunks stored in the LodePNGInfo struct, or add new ones to it. - It also allows traversing the chunks of an encoded PNG file yourself. - - The chunk pointer always points to the beginning of the chunk itself, that is - the first byte of the 4 length bytes. - - In the PNG file format, chunks have the following format: - -4 bytes length: length of the data of the chunk in bytes (chunk itself is 12 bytes longer) - -4 bytes chunk type (ASCII a-z,A-Z only, see below) - -length bytes of data (may be 0 bytes if length was 0) - -4 bytes of CRC, computed on chunk name + data - - The first chunk starts at the 8th byte of the PNG file, the entire rest of the file - exists out of concatenated chunks with the above format. - - PNG standard chunk ASCII naming conventions: - -First byte: uppercase = critical, lowercase = ancillary - -Second byte: uppercase = public, lowercase = private - -Third byte: must be uppercase - -Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy -*/ - - -/* - Gets the length of the data of the chunk. Total chunk length has 12 bytes more. - There must be at least 4 bytes to read from. If the result value is too large, - it may be corrupt data. -*/ -static unsigned lodepng_chunk_length(const unsigned char* chunk) -{ - return lodepng_read32bitInt(&chunk[0]); -} - - -/* check if the type is the given type */ -static unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) -{ - if (lodepng_strlen(type) != 4) return 0; - return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); -} - - -/* 0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard) */ -static unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) -{ - return ((chunk[4] & 32) != 0); -} - - -static const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) -{ - return &chunk[8]; -} - -#if 0 //thorvg don't use crc -/* returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!) */ -static unsigned lodepng_chunk_check_crc(const unsigned char* chunk) -{ - unsigned length = lodepng_chunk_length(chunk); - unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]); - /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ - unsigned checksum = lodepng_crc32(&chunk[4], length + 4); - if (CRC != checksum) return 1; - else return 0; -} -#endif - -static const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end) -{ - if (chunk >= end || end - chunk < 12) return end; /*too small to contain a chunk*/ - if (chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47 - && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) { - /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */ - return chunk + 8; - } else { - size_t total_chunk_length; - const unsigned char* result; - if (lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end; - result = chunk + total_chunk_length; - if (result < chunk) return end; /*pointer overflow*/ - return result; - } -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / Color types, channels, bits / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -/*checks if the colortype is valid and the bitdepth bd is allowed for this colortype. -Return value is a LodePNG error code.*/ -static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) -{ - switch(colortype) { - case LCT_GREY: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; - case LCT_RGB: if(!( bd == 8 || bd == 16)) return 37; break; - case LCT_PALETTE: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; - case LCT_GREY_ALPHA: if(!( bd == 8 || bd == 16)) return 37; break; - case LCT_RGBA: if(!( bd == 8 || bd == 16)) return 37; break; - case LCT_MAX_OCTET_VALUE: return 31; /* invalid color type */ - default: return 31; /* invalid color type */ - } - return 0; /*allowed color type / bits combination*/ -} - - -static unsigned getNumColorChannels(LodePNGColorType colortype) -{ - switch(colortype) { - case LCT_GREY: return 1; - case LCT_RGB: return 3; - case LCT_PALETTE: return 1; - case LCT_GREY_ALPHA: return 2; - case LCT_RGBA: return 4; - case LCT_MAX_OCTET_VALUE: return 0; /* invalid color type */ - default: return 0; /*invalid color type*/ - } -} - - -static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) -{ - /*bits per pixel is amount of channels * bits per channel*/ - return getNumColorChannels(colortype) * bitdepth; -} - - -static void lodepng_color_mode_init(LodePNGColorMode* info) -{ - info->key_defined = 0; - info->key_r = info->key_g = info->key_b = 0; - info->colortype = LCT_RGBA; - info->bitdepth = 8; - info->palette = 0; - info->palettesize = 0; -} - - -/*allocates palette memory if needed, and initializes all colors to black*/ -static void lodepng_color_mode_alloc_palette(LodePNGColorMode* info) -{ - size_t i; - /*if the palette is already allocated, it will have size 1024 so no reallocation needed in that case*/ - /*the palette must have room for up to 256 colors with 4 bytes each.*/ - if (!info->palette) info->palette = (unsigned char*)malloc(1024); - if (!info->palette) return; /*alloc fail*/ - for (i = 0; i != 256; ++i) { - /*Initialize all unused colors with black, the value used for invalid palette indices. - This is an error according to the PNG spec, but common PNG decoders make it black instead. - That makes color conversion slightly faster due to no error handling needed.*/ - info->palette[i * 4 + 0] = 0; - info->palette[i * 4 + 1] = 0; - info->palette[i * 4 + 2] = 0; - info->palette[i * 4 + 3] = 255; - } -} - -static void lodepng_palette_clear(LodePNGColorMode* info) -{ - if (info->palette) free(info->palette); - info->palette = 0; - info->palettesize = 0; -} - - -static void lodepng_color_mode_cleanup(LodePNGColorMode* info) -{ - lodepng_palette_clear(info); -} - - -/*return value is error code (0 means no error)*/ -static unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) -{ - lodepng_color_mode_cleanup(dest); - lodepng_memcpy(dest, source, sizeof(LodePNGColorMode)); - if (source->palette) { - dest->palette = (unsigned char*)malloc(1024); - if (!dest->palette && source->palettesize) return 83; /*alloc fail*/ - lodepng_memcpy(dest->palette, source->palette, source->palettesize * 4); - } - return 0; -} - - -static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) -{ - size_t i; - if (a->colortype != b->colortype) return 0; - if (a->bitdepth != b->bitdepth) return 0; - if (a->key_defined != b->key_defined) return 0; - if (a->key_defined) { - if(a->key_r != b->key_r) return 0; - if(a->key_g != b->key_g) return 0; - if(a->key_b != b->key_b) return 0; - } - if (a->palettesize != b->palettesize) return 0; - for (i = 0; i != a->palettesize * 4; ++i) { - if (a->palette[i] != b->palette[i]) return 0; - } - return 1; -} - - -static size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) -{ - size_t bpp = lodepng_get_bpp_lct(colortype, bitdepth); - size_t n = (size_t)w * (size_t)h; - return ((n / 8u) * bpp) + ((n & 7u) * bpp + 7u) / 8u; -} - - -/* Returns the byte size of a raw image buffer with given width, height and color mode */ -static size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) -{ - return lodepng_get_raw_size_lct(w, h, color->colortype, color->bitdepth); -} - - -/*in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer, -and in addition has one extra byte per line: the filter byte. So this gives a larger -result than lodepng_get_raw_size. Set h to 1 to get the size of 1 row including filter byte. */ -static size_t lodepng_get_raw_size_idat(unsigned w, unsigned h, unsigned bpp) -{ - /* + 1 for the filter byte, and possibly plus padding bits per line. */ - /* Ignoring casts, the expression is equal to (w * bpp + 7) / 8 + 1, but avoids overflow of w * bpp */ - size_t line = ((size_t)(w / 8u) * bpp) + 1u + ((w & 7u) * bpp + 7u) / 8u; - return (size_t)h * line; -} - - -/* Safely checks whether size_t overflow can be caused due to amount of pixels. - This check is overcautious rather than precise. If this check indicates no overflow, - you can safely compute in a size_t (but not an unsigned): - -(size_t)w * (size_t)h * 8 - -amount of bytes in IDAT (including filter, padding and Adam7 bytes) - -amount of bytes in raw color model - Returns 1 if overflow possible, 0 if not. */ -static int lodepng_pixel_overflow(unsigned w, unsigned h, const LodePNGColorMode* pngcolor, const LodePNGColorMode* rawcolor) -{ - size_t bpp = LODEPNG_MAX(lodepng_get_bpp_lct(pngcolor->colortype, pngcolor->bitdepth), lodepng_get_bpp_lct(rawcolor->colortype, rawcolor->bitdepth)); - size_t numpixels, total; - size_t line; /* bytes per line in worst case */ - - if (lodepng_mulofl((size_t)w, (size_t)h, &numpixels)) return 1; - if (lodepng_mulofl(numpixels, 8, &total)) return 1; /* bit pointer with 8-bit color, or 8 bytes per channel color */ - - /* Bytes per scanline with the expression "(w / 8u) * bpp) + ((w & 7u) * bpp + 7u) / 8u" */ - if (lodepng_mulofl((size_t)(w / 8u), bpp, &line)) return 1; - if (lodepng_addofl(line, ((w & 7u) * bpp + 7u) / 8u, &line)) return 1; - - if (lodepng_addofl(line, 5, &line)) return 1; /* 5 bytes overhead per line: 1 filterbyte, 4 for Adam7 worst case */ - if (lodepng_mulofl(line, h, &total)) return 1; /* Total bytes in worst case */ - - return 0; /* no overflow */ -} - - -static void lodepng_info_init(LodePNGInfo* info) -{ - lodepng_color_mode_init(&info->color); - info->interlace_method = 0; - info->compression_method = 0; - info->filter_method = 0; -} - - -static void lodepng_info_cleanup(LodePNGInfo* info) -{ - lodepng_color_mode_cleanup(&info->color); -} - - -/* index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to */ -static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) -{ - unsigned m = bits == 1 ? 7 : bits == 2 ? 3 : 1; /*8 / bits - 1*/ - /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/ - unsigned p = index & m; - in &= (1u << bits) - 1u; /*filter out any other bits of the input value*/ - in = in << (bits * (m - p)); - if(p == 0) out[index * bits / 8u] = in; - else out[index * bits / 8u] |= in; -} - -/* - One node of a color tree - This is the data structure used to count the number of unique colors and to get a palette - index for a color. It's like an octree, but because the alpha channel is used too, each - node has 16 instead of 8 children. -*/ -struct ColorTree -{ - ColorTree* children[16]; /* up to 16 pointers to ColorTree of next level */ - int index; /* the payload. Only has a meaningful value if this is in the last level */ -}; - -static void color_tree_init(ColorTree* tree) -{ - lodepng_memset(tree->children, 0, 16 * sizeof(*tree->children)); - tree->index = -1; -} - -static void color_tree_cleanup(ColorTree* tree) -{ - int i; - for (i = 0; i != 16; ++i) { - if(tree->children[i]) { - color_tree_cleanup(tree->children[i]); - free(tree->children[i]); - } - } -} - - -/* returns -1 if color not present, its index otherwise */ -static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - int bit = 0; - for (bit = 0; bit < 8; ++bit) { - int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); - if (!tree->children[i]) return -1; - else tree = tree->children[i]; - } - return tree ? tree->index : -1; -} - - -/* color is not allowed to already exist. - Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist") - Returns error code, or 0 if ok */ -static unsigned color_tree_add(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned index) -{ - int bit; - for (bit = 0; bit < 8; ++bit) { - int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); - if (!tree->children[i]) { - tree->children[i] = (ColorTree*)malloc(sizeof(ColorTree)); - if (!tree->children[i]) return 83; /*alloc fail*/ - color_tree_init(tree->children[i]); - } - tree = tree->children[i]; - } - tree->index = (int)index; - return 0; -} - -/* put a pixel, given its RGBA color, into image of any color type */ -static unsigned rgba8ToPixel(unsigned char* out, size_t i, const LodePNGColorMode* mode, ColorTree* tree /*for palette*/, unsigned char r, unsigned char g, unsigned char b, unsigned char a) -{ - if (mode->colortype == LCT_GREY) { - unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ - if (mode->bitdepth == 8) out[i] = gray; - else if (mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = gray; - else { - /*take the most significant bits of gray*/ - gray = ((unsigned)gray >> (8u - mode->bitdepth)) & ((1u << mode->bitdepth) - 1u); - addColorBits(out, i, mode->bitdepth, gray); - } - } else if (mode->colortype == LCT_RGB) { - if (mode->bitdepth == 8) { - out[i * 3 + 0] = r; - out[i * 3 + 1] = g; - out[i * 3 + 2] = b; - } else { - out[i * 6 + 0] = out[i * 6 + 1] = r; - out[i * 6 + 2] = out[i * 6 + 3] = g; - out[i * 6 + 4] = out[i * 6 + 5] = b; - } - } else if(mode->colortype == LCT_PALETTE) { - int index = color_tree_get(tree, r, g, b, a); - if (index < 0) return 82; /*color not in palette*/ - if (mode->bitdepth == 8) out[i] = index; - else addColorBits(out, i, mode->bitdepth, (unsigned)index); - } else if (mode->colortype == LCT_GREY_ALPHA) { - unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ - if (mode->bitdepth == 8) { - out[i * 2 + 0] = gray; - out[i * 2 + 1] = a; - } else if (mode->bitdepth == 16) { - out[i * 4 + 0] = out[i * 4 + 1] = gray; - out[i * 4 + 2] = out[i * 4 + 3] = a; - } - } else if (mode->colortype == LCT_RGBA) { - if (mode->bitdepth == 8) { - out[i * 4 + 0] = r; - out[i * 4 + 1] = g; - out[i * 4 + 2] = b; - out[i * 4 + 3] = a; - } else { - out[i * 8 + 0] = out[i * 8 + 1] = r; - out[i * 8 + 2] = out[i * 8 + 3] = g; - out[i * 8 + 4] = out[i * 8 + 5] = b; - out[i * 8 + 6] = out[i * 8 + 7] = a; - } - } - return 0; /*no error*/ -} - - -/* put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type */ -static void rgba16ToPixel(unsigned char* out, size_t i, const LodePNGColorMode* mode, unsigned short r, unsigned short g, unsigned short b, unsigned short a) -{ - if (mode->colortype == LCT_GREY) { - unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ - out[i * 2 + 0] = (gray >> 8) & 255; - out[i * 2 + 1] = gray & 255; - } else if (mode->colortype == LCT_RGB) { - out[i * 6 + 0] = (r >> 8) & 255; - out[i * 6 + 1] = r & 255; - out[i * 6 + 2] = (g >> 8) & 255; - out[i * 6 + 3] = g & 255; - out[i * 6 + 4] = (b >> 8) & 255; - out[i * 6 + 5] = b & 255; - } else if (mode->colortype == LCT_GREY_ALPHA) { - unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ - out[i * 4 + 0] = (gray >> 8) & 255; - out[i * 4 + 1] = gray & 255; - out[i * 4 + 2] = (a >> 8) & 255; - out[i * 4 + 3] = a & 255; - } else if (mode->colortype == LCT_RGBA) { - out[i * 8 + 0] = (r >> 8) & 255; - out[i * 8 + 1] = r & 255; - out[i * 8 + 2] = (g >> 8) & 255; - out[i * 8 + 3] = g & 255; - out[i * 8 + 4] = (b >> 8) & 255; - out[i * 8 + 5] = b & 255; - out[i * 8 + 6] = (a >> 8) & 255; - out[i * 8 + 7] = a & 255; - } -} - - -/* Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type. */ -static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, unsigned char* b, unsigned char* a, const unsigned char* in, size_t i, const LodePNGColorMode* mode) -{ - if (mode->colortype == LCT_GREY) { - if (mode->bitdepth == 8) { - *r = *g = *b = in[i]; - if (mode->key_defined && *r == mode->key_r) *a = 0; - else *a = 255; - } else if (mode->bitdepth == 16) { - *r = *g = *b = in[i * 2 + 0]; - if (mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; - else *a = 255; - } else { - unsigned highest = ((1U << mode->bitdepth) - 1U); /* highest possible value for this bit depth */ - size_t j = i * mode->bitdepth; - unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); - *r = *g = *b = (value * 255) / highest; - if (mode->key_defined && value == mode->key_r) *a = 0; - else *a = 255; - } - } else if (mode->colortype == LCT_RGB) { - if (mode->bitdepth == 8) { - *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2]; - if (mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0; - else *a = 255; - } else { - *r = in[i * 6 + 0]; - *g = in[i * 6 + 2]; - *b = in[i * 6 + 4]; - if (mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r - && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g - && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; - else *a = 255; - } - } else if (mode->colortype == LCT_PALETTE) { - unsigned index; - if (mode->bitdepth == 8) index = in[i]; - else { - size_t j = i * mode->bitdepth; - index = readBitsFromReversedStream(&j, in, mode->bitdepth); - } - /* out of bounds of palette not checked: see lodepng_color_mode_alloc_palette. */ - *r = mode->palette[index * 4 + 0]; - *g = mode->palette[index * 4 + 1]; - *b = mode->palette[index * 4 + 2]; - *a = mode->palette[index * 4 + 3]; - } else if (mode->colortype == LCT_GREY_ALPHA) { - if (mode->bitdepth == 8) { - *r = *g = *b = in[i * 2 + 0]; - *a = in[i * 2 + 1]; - } else { - *r = *g = *b = in[i * 4 + 0]; - *a = in[i * 4 + 2]; - } - } else if (mode->colortype == LCT_RGBA) { - if (mode->bitdepth == 8) { - *r = in[i * 4 + 0]; - *g = in[i * 4 + 1]; - *b = in[i * 4 + 2]; - *a = in[i * 4 + 3]; - } else { - *r = in[i * 8 + 0]; - *g = in[i * 8 + 2]; - *b = in[i * 8 + 4]; - *a = in[i * 8 + 6]; - } - } -} - - -/* Similar to getPixelColorRGBA8, but with all the for loops inside of the color - mode test cases, optimized to convert the colors much faster, when converting - to the common case of RGBA with 8 bit per channel. buffer must be RGBA with - enough memory.*/ -static void getPixelColorsRGBA8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, const unsigned char* LODEPNG_RESTRICT in, const LodePNGColorMode* mode) -{ - unsigned num_channels = 4; - size_t i; - if (mode->colortype == LCT_GREY) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i]; - buffer[3] = 255; - } - if (mode->key_defined) { - buffer -= numpixels * num_channels; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - if(buffer[0] == mode->key_r) buffer[3] = 0; - } - } - } else if (mode->bitdepth == 16) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 2]; - buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255; - } - } else { - unsigned highest = ((1U << mode->bitdepth) - 1U); /* highest possible value for this bit depth */ - size_t j = 0; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); - buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; - buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255; - } - } - } else if (mode->colortype == LCT_RGB) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - //lodepng_memcpy(buffer, &in[i * 3], 3); - //Convert colortype to LCT_BGR? - buffer[0] = in[i * 3 + 2]; - buffer[1] = in[i * 3 + 1]; - buffer[2] = in[i * 3 + 0]; - buffer[3] = 255; - } - if (mode->key_defined) { - buffer -= numpixels * num_channels; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - if (buffer[0] == mode->key_r && buffer[1]== mode->key_g && buffer[2] == mode->key_b) buffer[3] = 0; - } - } - } else { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = in[i * 6 + 0]; - buffer[1] = in[i * 6 + 2]; - buffer[2] = in[i * 6 + 4]; - buffer[3] = mode->key_defined - && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r - && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g - && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b ? 0 : 255; - } - } - } else if (mode->colortype == LCT_PALETTE) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned index = in[i]; - /* out of bounds of palette not checked: see lodepng_color_mode_alloc_palette. */ - lodepng_memcpy(buffer, &mode->palette[index * 4], 4); - } - } else { - size_t j = 0; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); - /* out of bounds of palette not checked: see lodepng_color_mode_alloc_palette. */ - lodepng_memcpy(buffer, &mode->palette[index * 4], 4); - } - } - } else if (mode->colortype == LCT_GREY_ALPHA) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; - buffer[3] = in[i * 2 + 1]; - } - } else { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; - buffer[3] = in[i * 4 + 2]; - } - } - } else if (mode->colortype == LCT_RGBA) { - if (mode->bitdepth == 8) { - lodepng_memcpy(buffer, in, numpixels * 4); - } else { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = in[i * 8 + 0]; - buffer[1] = in[i * 8 + 2]; - buffer[2] = in[i * 8 + 4]; - buffer[3] = in[i * 8 + 6]; - } - } - } -} - - -/* Similar to getPixelColorsRGBA8, but with 3-channel RGB output. */ -static void getPixelColorsRGB8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, const unsigned char* LODEPNG_RESTRICT in, const LodePNGColorMode* mode) -{ - const unsigned num_channels = 3; - size_t i; - if (mode->colortype == LCT_GREY) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i]; - } - } else if (mode->bitdepth == 16) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 2]; - } - } else { - unsigned highest = ((1U << mode->bitdepth) - 1U); /* highest possible value for this bit depth */ - size_t j = 0; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); - buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; - } - } - } else if (mode->colortype == LCT_RGB) { - if (mode->bitdepth == 8) { - lodepng_memcpy(buffer, in, numpixels * 3); - } else { - for(i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = in[i * 6 + 0]; - buffer[1] = in[i * 6 + 2]; - buffer[2] = in[i * 6 + 4]; - } - } - } else if (mode->colortype == LCT_PALETTE) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned index = in[i]; - /* out of bounds of palette not checked: see lodepng_color_mode_alloc_palette. */ - lodepng_memcpy(buffer, &mode->palette[index * 4], 3); - } - } else { - size_t j = 0; - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); - /* out of bounds of palette not checked: see lodepng_color_mode_alloc_palette. */ - lodepng_memcpy(buffer, &mode->palette[index * 4], 3); - } - } - } else if (mode->colortype == LCT_GREY_ALPHA) { - if (mode->bitdepth == 8) { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; - } - } else { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; - } - } - } else if (mode->colortype == LCT_RGBA) { - if (mode->bitdepth == 8) { - for(i = 0; i != numpixels; ++i, buffer += num_channels) { - lodepng_memcpy(buffer, &in[i * 4], 3); - } - } else { - for (i = 0; i != numpixels; ++i, buffer += num_channels) { - buffer[0] = in[i * 8 + 0]; - buffer[1] = in[i * 8 + 2]; - buffer[2] = in[i * 8 + 4]; - } - } - } -} - - -/* Get RGBA16 color of pixel with index i (y * width + x) from the raw image with - given color type, but the given color type must be 16-bit itself. */ -static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a, const unsigned char* in, size_t i, const LodePNGColorMode* mode) -{ - if (mode->colortype == LCT_GREY) { - *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1]; - if (mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; - else *a = 65535; - } else if (mode->colortype == LCT_RGB) { - *r = 256u * in[i * 6 + 0] + in[i * 6 + 1]; - *g = 256u * in[i * 6 + 2] + in[i * 6 + 3]; - *b = 256u * in[i * 6 + 4] + in[i * 6 + 5]; - if (mode->key_defined - && 256u * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r - && 256u * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g - && 256u * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; - else *a = 65535; - } else if (mode->colortype == LCT_GREY_ALPHA) { - *r = *g = *b = 256u * in[i * 4 + 0] + in[i * 4 + 1]; - *a = 256u * in[i * 4 + 2] + in[i * 4 + 3]; - } else if (mode->colortype == LCT_RGBA) { - *r = 256u * in[i * 8 + 0] + in[i * 8 + 1]; - *g = 256u * in[i * 8 + 2] + in[i * 8 + 3]; - *b = 256u * in[i * 8 + 4] + in[i * 8 + 5]; - *a = 256u * in[i * 8 + 6] + in[i * 8 + 7]; - } -} - -/* - Converts raw buffer from one color type to another color type, based on - LodePNGColorMode structs to describe the input and output color type. - See the reference manual at the end of this header file to see which color conversions are supported. - return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported) - The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel - of the output color type (lodepng_get_bpp). - For < 8 bpp images, there should not be padding bits at the end of scanlines. - For 16-bit per channel colors, uses big endian format like PNG does. - Return value is LodePNG error code -*/ -static unsigned lodepng_convert(unsigned char* out, const unsigned char* in, const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, unsigned w, unsigned h) -{ - size_t i; - ColorTree tree; - size_t numpixels = (size_t)w * (size_t)h; - unsigned error = 0; - - if (mode_in->colortype == LCT_PALETTE && !mode_in->palette) { - return 107; /* error: must provide palette if input mode is palette */ - } - - if (lodepng_color_mode_equal(mode_out, mode_in)) { - size_t numbytes = lodepng_get_raw_size(w, h, mode_in); - lodepng_memcpy(out, in, numbytes); - return 0; - } - - if (mode_out->colortype == LCT_PALETTE) { - size_t palettesize = mode_out->palettesize; - const unsigned char* palette = mode_out->palette; - size_t palsize = (size_t)1u << mode_out->bitdepth; - /* if the user specified output palette but did not give the values, assume - they want the values of the input color type (assuming that one is palette). - Note that we never create a new palette ourselves.*/ - if (palettesize == 0) { - palettesize = mode_in->palettesize; - palette = mode_in->palette; - /* if the input was also palette with same bitdepth, then the color types are also - equal, so copy literally. This to preserve the exact indices that were in the PNG - even in case there are duplicate colors in the palette.*/ - if (mode_in->colortype == LCT_PALETTE && mode_in->bitdepth == mode_out->bitdepth) { - size_t numbytes = lodepng_get_raw_size(w, h, mode_in); - lodepng_memcpy(out, in, numbytes); - return 0; - } - } - if (palettesize < palsize) palsize = palettesize; - color_tree_init(&tree); - for (i = 0; i != palsize; ++i) { - const unsigned char* p = &palette[i * 4]; - error = color_tree_add(&tree, p[0], p[1], p[2], p[3], (unsigned)i); - if (error) break; - } - } - - if (!error) { - if (mode_in->bitdepth == 16 && mode_out->bitdepth == 16) { - for (i = 0; i != numpixels; ++i) { - unsigned short r = 0, g = 0, b = 0, a = 0; - getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); - rgba16ToPixel(out, i, mode_out, r, g, b, a); - } - } else if (mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) { - getPixelColorsRGBA8(out, numpixels, in, mode_in); - } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) { - getPixelColorsRGB8(out, numpixels, in, mode_in); - } else { - unsigned char r = 0, g = 0, b = 0, a = 0; - for (i = 0; i != numpixels; ++i) { - getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); - error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a); - if (error) break; - } - } - } - - if (mode_out->colortype == LCT_PALETTE) { - color_tree_cleanup(&tree); - } - - return error; -} - - -/* Paeth predictor, used by PNG filter type 4 - The parameters are of type short, but should come from unsigned chars, the shorts - are only needed to make the paeth calculation correct. -*/ -static unsigned char paethPredictor(short a, short b, short c) -{ - short pa = LODEPNG_ABS(b - c); - short pb = LODEPNG_ABS(a - c); - short pc = LODEPNG_ABS(a + b - c - c); - /* return input value associated with smallest of pa, pb, pc (with certain priority if equal) */ - if (pb < pa) { a = b; pa = pb; } - return (pc < pa) ? c : a; -} - - -/*shared values used by multiple Adam7 related functions*/ -static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/ -static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/ -static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/ -static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/ - -/* Outputs various dimensions and positions in the image related to the Adam7 reduced images. - passw: output containing the width of the 7 passes - passh: output containing the height of the 7 passes - filter_passstart: output containing the index of the start and end of each - reduced image with filter bytes - padded_passstart output containing the index of the start and end of each - reduced image when without filter bytes but with padded scanlines - passstart: output containing the index of the start and end of each reduced - image without padding between scanlines, but still padding between the images - w, h: width and height of non-interlaced image - bpp: bits per pixel - "padded" is only relevant if bpp is less than 8 and a scanline or image does not - end at a full byte */ -static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) -{ - /* the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass */ - unsigned i; - - /* calculate width and height in pixels of each pass */ - for (i = 0; i != 7; ++i) { - passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; - passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; - if(passw[i] == 0) passh[i] = 0; - if(passh[i] == 0) passw[i] = 0; - } - - filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; - for (i = 0; i != 7; ++i) { - /* if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte) */ - filter_passstart[i + 1] = filter_passstart[i] - + ((passw[i] && passh[i]) ? passh[i] * (1u + (passw[i] * bpp + 7u) / 8u) : 0); - /* bits padded if needed to fill full byte at end of each scanline */ - padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7u) / 8u); - /* only padded at end of reduced image */ - passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7u) / 8u; - } -} - - -/* ////////////////////////////////////////////////////////////////////////// */ -/* / PNG Decoder / */ -/* ////////////////////////////////////////////////////////////////////////// */ - -static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, size_t bytewidth, unsigned char filterType, size_t length) -{ - /* For PNG filter method 0 - unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, - the filter works byte per byte (bytewidth = 1) - precon is the previous unfiltered scanline, recon the result, scanline the current one - the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead - recon and scanline MAY be the same memory address! precon must be disjoint. */ - - size_t i; - switch (filterType) { - case 0: { - if (bytewidth == 4) { - for (i = 0; i < length; i += 4) { - //RGBA -> BGRA - recon[i + 0] = scanline[i + 2]; - recon[i + 1] = scanline[i + 1]; - recon[i + 2] = scanline[i + 0]; - recon[i + 3] = scanline[i + 3]; - } - } else { - for (i = 0; i != length; ++i) recon[i] = scanline[i]; - } - break; - } - case 1: { - for (i = 0; i != bytewidth; ++i) recon[i] = scanline[i]; - for (i = bytewidth; i < length; ++i) recon[i] = scanline[i] + recon[i - bytewidth]; - break; - } - case 2: { - if (precon) { - for (i = 0; i != length; ++i) recon[i] = scanline[i] + precon[i]; - } else { - for (i = 0; i != length; ++i) recon[i] = scanline[i]; - } - break; - } - case 3: { - if (precon) { - for (i = 0; i != bytewidth; ++i) recon[i] = scanline[i] + (precon[i] >> 1u); - for (i = bytewidth; i < length; ++i) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) >> 1u); - } else { - for (i = 0; i != bytewidth; ++i) recon[i] = scanline[i]; - for (i = bytewidth; i < length; ++i) recon[i] = scanline[i] + (recon[i - bytewidth] >> 1u); - } - break; - } - case 4: { - if (precon) { - for (i = 0; i != bytewidth; ++i) { - recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/ - } - - /* Unroll independent paths of the paeth predictor. A 6x and 8x version would also be possible but that - adds too much code. Whether this actually speeds anything up at all depends on compiler and settings. */ - if (bytewidth >= 4) { - for (; i + 3 < length; i += 4) { - size_t j = i - bytewidth; - unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2], s3 = scanline[i + 3]; - unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2], r3 = recon[j + 3]; - unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2], p3 = precon[i + 3]; - unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2], q3 = precon[j + 3]; - recon[i + 0] = s0 + paethPredictor(r0, p0, q0); - recon[i + 1] = s1 + paethPredictor(r1, p1, q1); - recon[i + 2] = s2 + paethPredictor(r2, p2, q2); - recon[i + 3] = s3 + paethPredictor(r3, p3, q3); - } - } else if (bytewidth >= 3) { - for (; i + 2 < length; i += 3) { - size_t j = i - bytewidth; - unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2]; - unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2]; - unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2]; - unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2]; - recon[i + 0] = s0 + paethPredictor(r0, p0, q0); - recon[i + 1] = s1 + paethPredictor(r1, p1, q1); - recon[i + 2] = s2 + paethPredictor(r2, p2, q2); - } - } else if (bytewidth >= 2) { - for (; i + 1 < length; i += 2) { - size_t j = i - bytewidth; - unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1]; - unsigned char r0 = recon[j + 0], r1 = recon[j + 1]; - unsigned char p0 = precon[i + 0], p1 = precon[i + 1]; - unsigned char q0 = precon[j + 0], q1 = precon[j + 1]; - recon[i + 0] = s0 + paethPredictor(r0, p0, q0); - recon[i + 1] = s1 + paethPredictor(r1, p1, q1); - } - } - - for (; i != length; ++i) { - recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth])); - } - } else { - for (i = 0; i != bytewidth; ++i) { - recon[i] = scanline[i]; - } - for (i = bytewidth; i < length; ++i) { - /* paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth] */ - recon[i] = (scanline[i] + recon[i - bytewidth]); - } - } - break; - } - default: return 36; /* error: invalid filter type given */ - } - return 0; -} - - -static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ - /* For PNG filter method 0 - this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times) - out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline - w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel - in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes) */ - - unsigned y; - unsigned char* prevline = 0; - - /* bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise */ - size_t bytewidth = (bpp + 7u) / 8u; - /* the width of a scanline in bytes, not including the filter type */ - size_t linebytes = lodepng_get_raw_size_idat(w, 1, bpp) - 1u; - - for (y = 0; y < h; ++y) { - size_t outindex = linebytes * y; - size_t inindex = (1 + linebytes) * y; /* the extra filterbyte added to each row */ - unsigned char filterType = in[inindex]; - CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes)); - prevline = &out[outindex]; - } - - return 0; -} - -/* in: Adam7 interlaced image, with no padding bits between scanlines, but between - reduced images so that each reduced image starts at a byte. - out: the same pixels, but re-ordered so that they're now a non-interlaced image with size w*h - bpp: bits per pixel - out has the following size in bits: w * h * bpp. - in is possibly bigger due to padding bits between reduced images. - out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation - (because that's likely a little bit faster) - NOTE: comments about padding bits are only relevant if bpp < 8 */ -static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) -{ - unsigned passw[7], passh[7]; - size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - if (bpp >= 8) { - for(i = 0; i != 7; ++i) { - unsigned x, y, b; - size_t bytewidth = bpp / 8u; - for (y = 0; y < passh[i]; ++y) - for (x = 0; x < passw[i]; ++x) { - size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; - size_t pixeloutstart = ((ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * (size_t)w + ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bytewidth; - for (b = 0; b < bytewidth; ++b) { - out[pixeloutstart + b] = in[pixelinstart + b]; - } - } - } - } else /* bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers */ { - for (i = 0; i != 7; ++i) { - unsigned x, y, b; - unsigned ilinebits = bpp * passw[i]; - unsigned olinebits = bpp * w; - size_t obp, ibp; /* bit pointers (for out and in buffer) */ - for (y = 0; y < passh[i]; ++y) - for (x = 0; x < passw[i]; ++x) { - ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); - obp = (ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bpp; - for (b = 0; b < bpp; ++b) { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream(&obp, out, bit); - } - } - } - } -} - - -static void removePaddingBits(unsigned char* out, const unsigned char* in, size_t olinebits, size_t ilinebits, unsigned h) -{ - /* After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need - to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers - for the Adam7 code, the color convert code and the output to the user. - in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must - have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits - also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7 - only useful if (ilinebits - olinebits) is a value in the range 1..7 */ - unsigned y; - size_t diff = ilinebits - olinebits; - size_t ibp = 0, obp = 0; /*input and output bit pointers*/ - for (y = 0; y < h; ++y) { - size_t x; - for (x = 0; x < olinebits; ++x) { - unsigned char bit = readBitFromReversedStream(&ibp, in); - setBitOfReversedStream(&obp, out, bit); - } - ibp += diff; - } -} - - -/* out must be buffer big enough to contain full image, and in must contain the full decompressed data from - the IDAT chunks (with filter index bytes and possible padding bits) - return value is error */ -static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, unsigned w, unsigned h, const LodePNGInfo* info_png) -{ - /* This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. - Steps: - *) if no Adam7: 1) unfilter 2) remove padding bits (= possible extra bits per scanline if bpp < 8) - *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace - NOTE: the in buffer will be overwritten with intermediate data! */ - unsigned bpp = lodepng_get_bpp_lct(info_png->color.colortype, info_png->color.bitdepth); - if (bpp == 0) return 31; /* error: invalid colortype */ - - if (info_png->interlace_method == 0) { - if (bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) { - CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp)); - removePaddingBits(out, in, w * bpp, ((w * bpp + 7u) / 8u) * 8u, h); - } - /* we can immediately filter into the out buffer, no other steps needed */ - else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp)); - } else /* interlace_method is 1 (Adam7) */ { - unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; - unsigned i; - - Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); - - for (i = 0; i != 7; ++i) { - CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp)); - /* TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, - move bytes instead of bits or move not at all */ - if (bpp < 8) { - /* remove padding bits in scanlines; after this there still may be padding - bits between the different reduced images: each reduced image still starts nicely at a byte */ - removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, ((passw[i] * bpp + 7u) / 8u) * 8u, passh[i]); - } - } - Adam7_deinterlace(out, in, w, h, bpp); - } - return 0; -} - - -static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) -{ - unsigned pos = 0, i; - color->palettesize = chunkLength / 3u; - if (color->palettesize == 0 || color->palettesize > 256) return 38; /* error: palette too small or big */ - lodepng_color_mode_alloc_palette(color); - if (!color->palette && color->palettesize) { - color->palettesize = 0; - return 83; /* alloc fail */ - } - - for (i = 0; i != color->palettesize; ++i) { - color->palette[4 * i + 0] = data[pos++]; /*R*/ - color->palette[4 * i + 1] = data[pos++]; /*G*/ - color->palette[4 * i + 2] = data[pos++]; /*B*/ - color->palette[4 * i + 3] = 255; /*alpha*/ - } - - return 0; /* OK */ -} - - -static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) -{ - unsigned i; - if (color->colortype == LCT_PALETTE) { - /* error: more alpha values given than there are palette entries */ - if (chunkLength > color->palettesize) return 39; - - for (i = 0; i != chunkLength; ++i) color->palette[4 * i + 3] = data[i]; - } else if (color->colortype == LCT_GREY) { - /* error: this chunk must be 2 bytes for grayscale image */ - if (chunkLength != 2) return 30; - - color->key_defined = 1; - color->key_r = color->key_g = color->key_b = 256u * data[0] + data[1]; - } else if (color->colortype == LCT_RGB) { - /* error: this chunk must be 6 bytes for RGB image */ - if (chunkLength != 6) return 41; - - color->key_defined = 1; - color->key_r = 256u * data[0] + data[1]; - color->key_g = 256u * data[2] + data[3]; - color->key_b = 256u * data[4] + data[5]; - } - else return 42; /* error: tRNS chunk not allowed for other color models */ - - return 0; /* OK */ -} - - -/* read a PNG, the result will be in the same color type as the PNG (hence "generic") */ -static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize) -{ - unsigned char IEND = 0; - const unsigned char* chunk; - unsigned char* idat; /*the data from idat chunks, zlib compressed*/ - size_t idatsize = 0; - unsigned char* scanlines = 0; - size_t scanlines_size = 0, expected_size = 0; - size_t outsize = 0; - - /* safe output values in case error happens */ - *out = 0; - *w = *h = 0; - - state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/ - if (state->error) return; - - if (lodepng_pixel_overflow(*w, *h, &state->info_png.color, &state->info_raw)) { - CERROR_RETURN(state->error, 92); /*overflow possible due to amount of pixels*/ - } - - /*the input filesize is a safe upper bound for the sum of idat chunks size*/ - idat = (unsigned char*)malloc(insize); - if (!idat) CERROR_RETURN(state->error, 83); /*alloc fail*/ - - chunk = &in[33]; /*first byte of the first chunk after the header*/ - - /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. - IDAT data is put at the start of the in buffer*/ - while (!IEND && !state->error) { - unsigned chunkLength; - const unsigned char* data; /*the data in the chunk*/ - - /*error: size of the in buffer too small to contain next chunk*/ - if ((size_t)((chunk - in) + 12) > insize || chunk < in) { - if (state->decoder.ignore_end) break; /*other errors may still happen though*/ - CERROR_BREAK(state->error, 30); - } - - /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/ - chunkLength = lodepng_chunk_length(chunk); - /*error: chunk length larger than the max PNG chunk size*/ - if (chunkLength > 2147483647) { - if (state->decoder.ignore_end) break; /*other errors may still happen though*/ - CERROR_BREAK(state->error, 63); - } - - if ((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in) { - CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk*/ - } - - data = lodepng_chunk_data_const(chunk); - - /*for unknown chunk order*/ - //unsigned unknown = 0; - - /*IDAT chunk, containing compressed image data*/ - if (lodepng_chunk_type_equals(chunk, "IDAT")) { - size_t newsize; - if (lodepng_addofl(idatsize, chunkLength, &newsize)) CERROR_BREAK(state->error, 95); - if (newsize > insize) CERROR_BREAK(state->error, 95); - lodepng_memcpy(idat + idatsize, data, chunkLength); - idatsize += chunkLength; - } else if (lodepng_chunk_type_equals(chunk, "IEND")) { - /*IEND chunk*/ - IEND = 1; - } else if (lodepng_chunk_type_equals(chunk, "PLTE")) { - /*palette chunk (PLTE)*/ - state->error = readChunk_PLTE(&state->info_png.color, data, chunkLength); - if (state->error) break; - } else if (lodepng_chunk_type_equals(chunk, "tRNS")) { - /*palette transparency chunk (tRNS). Even though this one is an ancillary chunk , it is still compiled - in without 'LODEPNG_COMPILE_ANCILLARY_CHUNKS' because it contains essential color information that - affects the alpha channel of pixels. */ - state->error = readChunk_tRNS(&state->info_png.color, data, chunkLength); - if (state->error) break; - } else /*it's not an implemented chunk type, so ignore it: skip over the data*/ { - /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ - if (!state->decoder.ignore_critical && !lodepng_chunk_ancillary(chunk)) { - CERROR_BREAK(state->error, 69); - } - //unknown = 1; - } - -#if 0 //We don't use CRC - if (!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ { - if (lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/ - } -#endif - if (!IEND) chunk = lodepng_chunk_next_const(chunk, in + insize); - } - - if (state->info_png.color.colortype == LCT_PALETTE && !state->info_png.color.palette) { - state->error = 106; /* error: PNG file must have PLTE chunk if color type is palette */ - } - - if (!state->error) { - /*predict output size, to allocate exact size for output buffer to avoid more dynamic allocation. - If the decompressed size does not match the prediction, the image must be corrupt.*/ - if (state->info_png.interlace_method == 0) { - size_t bpp = lodepng_get_bpp_lct(state->info_png.color.colortype, state->info_png.color.bitdepth); - expected_size = lodepng_get_raw_size_idat(*w, *h, bpp); - } else { - size_t bpp = lodepng_get_bpp_lct(state->info_png.color.colortype, state->info_png.color.bitdepth); - /*Adam-7 interlaced: expected size is the sum of the 7 sub-images sizes*/ - expected_size = 0; - expected_size += lodepng_get_raw_size_idat((*w + 7) >> 3, (*h + 7) >> 3, bpp); - if (*w > 4) expected_size += lodepng_get_raw_size_idat((*w + 3) >> 3, (*h + 7) >> 3, bpp); - expected_size += lodepng_get_raw_size_idat((*w + 3) >> 2, (*h + 3) >> 3, bpp); - if (*w > 2) expected_size += lodepng_get_raw_size_idat((*w + 1) >> 2, (*h + 3) >> 2, bpp); - expected_size += lodepng_get_raw_size_idat((*w + 1) >> 1, (*h + 1) >> 2, bpp); - if (*w > 1) expected_size += lodepng_get_raw_size_idat((*w + 0) >> 1, (*h + 1) >> 1, bpp); - expected_size += lodepng_get_raw_size_idat((*w + 0), (*h + 0) >> 1, bpp); - } - state->error = zlib_decompress(&scanlines, &scanlines_size, expected_size, idat, idatsize, &state->decoder.zlibsettings); - } - - if (!state->error && scanlines_size != expected_size) state->error = 91; /*decompressed size doesn't match prediction*/ - free(idat); - - if (!state->error) { - outsize = lodepng_get_raw_size(*w, *h, &state->info_png.color); - *out = (unsigned char*)malloc(outsize); - if (!*out) state->error = 83; /*alloc fail*/ - } - if (!state->error) { - lodepng_memset(*out, 0, outsize); - state->error = postProcessScanlines(*out, scanlines, *w, *h, &state->info_png); - } - free(scanlines); -} - - -static void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) -{ - settings->color_convert = 1; - settings->ignore_crc = 0; - settings->ignore_critical = 0; - settings->ignore_end = 0; - lodepng_decompress_settings_init(&settings->zlibsettings); -} - - -/************************************************************************/ -/* External Class Implementation */ -/************************************************************************/ - -/*read the information from the header and store it in the LodePNGInfo. return value is error*/ -unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize) -{ - unsigned width, height; - LodePNGInfo* info = &state->info_png; - if (insize == 0 || in == 0) { - CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/ - } - if (insize < 33) { - CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/ - } - - /* when decoding a new PNG image, make sure all parameters created after previous decoding are reset */ - /* TODO: remove this. One should use a new LodePNGState for new sessions */ - lodepng_info_cleanup(info); - lodepng_info_init(info); - - if (in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { - CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/ - } - if (lodepng_chunk_length(in + 8) != 13) { - CERROR_RETURN_ERROR(state->error, 94); /*error: header size must be 13 bytes*/ - } - if (!lodepng_chunk_type_equals(in + 8, "IHDR")) { - CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/ - } - - /*read the values given in the header*/ - width = lodepng_read32bitInt(&in[16]); - height = lodepng_read32bitInt(&in[20]); - /*TODO: remove the undocumented feature that allows to give null pointers to width or height*/ - if (w) *w = width; - if (h) *h = height; - info->color.bitdepth = in[24]; - info->color.colortype = (LodePNGColorType)in[25]; - info->compression_method = in[26]; - info->filter_method = in[27]; - info->interlace_method = in[28]; - - /*errors returned only after the parsing so other values are still output*/ - - /*error: invalid image size*/ - if (width == 0 || height == 0) CERROR_RETURN_ERROR(state->error, 93); - /*error: invalid colortype or bitdepth combination*/ - state->error = checkColorValidity(info->color.colortype, info->color.bitdepth); - if (state->error) return state->error; - /*error: only compression method 0 is allowed in the specification*/ - if (info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32); - /*error: only filter method 0 is allowed in the specification*/ - if (info->filter_method != 0) CERROR_RETURN_ERROR(state->error, 33); - /*error: only interlace methods 0 and 1 exist in the specification*/ - if (info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34); - -#if 0 //thorvg don't use crc - if (!state->decoder.ignore_crc) { - unsigned CRC = lodepng_read32bitInt(&in[29]); - unsigned checksum = lodepng_crc32(&in[12], 17); - if (CRC != checksum) { - CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/ - } - } -#endif - return state->error; -} - - -unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize) -{ - *out = 0; - decodeGeneric(out, w, h, state, in, insize); - if (state->error) return state->error; - if (!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) { - /*same color type, no copying or converting of data needed*/ - /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype - the raw image has to the end user*/ - if (!state->decoder.color_convert) { - state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color); - if (state->error) return state->error; - } - } else { /*color conversion needed*/ - unsigned char* data = *out; - size_t outsize; - - /*TODO: check if this works according to the statement in the documentation: "The converter can convert - from grayscale input color type, to 8-bit grayscale or grayscale with alpha"*/ - if (!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA) && !(state->info_raw.bitdepth == 8)) { - return 56; /*unsupported color mode conversion*/ - } - - outsize = lodepng_get_raw_size(*w, *h, &state->info_raw); - *out = (unsigned char*)malloc(outsize); - if (!(*out)) { - state->error = 83; /*alloc fail*/ - } - else state->error = lodepng_convert(*out, data, &state->info_raw, &state->info_png.color, *w, *h); - free(data); - } - return state->error; -} - - -void lodepng_state_init(LodePNGState* state) -{ - lodepng_decoder_settings_init(&state->decoder); - lodepng_color_mode_init(&state->info_raw); - lodepng_info_init(&state->info_png); - state->error = 1; -} - - -void lodepng_state_cleanup(LodePNGState* state) -{ - lodepng_color_mode_cleanup(&state->info_raw); - lodepng_info_cleanup(&state->info_png); -} diff --git a/thirdparty/thorvg/src/loaders/png/tvgLodePng.h b/thirdparty/thorvg/src/loaders/png/tvgLodePng.h deleted file mode 100644 index 0cdac7cbea..0000000000 --- a/thirdparty/thorvg/src/loaders/png/tvgLodePng.h +++ /dev/null @@ -1,174 +0,0 @@ -/* - * Copyright (c) 2020 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ - -/* - LodePNG version 20200306 - - Copyright (c) 2005-2020 Lode Vandevenne - - This software is provided 'as-is', without any express or implied - warranty. In no event will the authors be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - - 3. This notice may not be removed or altered from any source - distribution. -*/ - -#ifndef _TVG_LODEPNG_H_ -#define _TVG_LODEPNG_H_ - -#include <stddef.h> - -/*The PNG color types (also used for raw image).*/ -enum LodePNGColorType -{ - LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/ - LCT_RGB = 2, /*RGB: 8,16 bit*/ - LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ - LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/ - LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/ - /*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid - byte value from 0 to 255 that could be present in an invalid PNG file header. Do - not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use - the valid color type names above, or numeric values like 1 or 7 when checking for - particular disallowed color type byte values, or cast to integer to print it.*/ - LCT_MAX_OCTET_VALUE = 255 -}; - -/*Settings for zlib decompression*/ -struct LodePNGDecompressSettings -{ - /* Check LodePNGDecoderSettings for more ignorable errors such as ignore_crc */ - unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ - unsigned ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/ - - /*use custom zlib decoder instead of built in one (default: null)*/ - unsigned (*custom_zlib)(unsigned char**, size_t*, const unsigned char*, size_t, const LodePNGDecompressSettings*); - /*use custom deflate decoder instead of built in one (default: null) if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate)*/ - unsigned (*custom_inflate)(unsigned char**, size_t*, const unsigned char*, size_t, const LodePNGDecompressSettings*); - - const void* custom_context; /*optional custom settings for custom functions*/ -}; - -/* - Color mode of an image. Contains all information required to decode the pixel - bits to RGBA colors. This information is the same as used in the PNG file - format, and is used both for PNG and raw image data in LodePNG. -*/ -struct LodePNGColorMode -{ - /*header (IHDR)*/ - LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ - unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ - - /* - palette (PLTE and tRNS) - - Dynamically allocated with the colors of the palette, including alpha. - This field may not be allocated directly, use lodepng_color_mode_init first, - then lodepng_palette_add per color to correctly initialize it (to ensure size - of exactly 1024 bytes). - - The alpha channels must be set as well, set them to 255 for opaque images. - - When decoding, by default you can ignore this palette, since LodePNG already - fills the palette colors in the pixels of the raw RGBA output. - - The palette is only supported for color type 3. - */ - unsigned char* palette; /*palette in RGBARGBA... order. Must be either 0, or when allocated must have 1024 bytes*/ - size_t palettesize; /*palette size in number of colors (amount of used bytes is 4 * palettesize)*/ - - /* - transparent color key (tRNS) - - This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. - For grayscale PNGs, r, g and b will all 3 be set to the same. - - When decoding, by default you can ignore this information, since LodePNG sets - pixels with this key to transparent already in the raw RGBA output. - - The color key is only supported for color types 0 and 2. - */ - unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ - unsigned key_r; /*red/grayscale component of color key*/ - unsigned key_g; /*green component of color key*/ - unsigned key_b; /*blue component of color key*/ -}; - -/*Information about the PNG image, except pixels, width and height.*/ -struct LodePNGInfo -{ - /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ - unsigned compression_method;/*compression method of the original file. Always 0.*/ - unsigned filter_method; /*filter method of the original file*/ - unsigned interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/ - LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ -}; - -/* - Settings for the decoder. This contains settings for the PNG and the Zlib - decoder, but not the Info settings from the Info structs. -*/ -struct LodePNGDecoderSettings -{ - LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ - - /* Check LodePNGDecompressSettings for more ignorable errors such as ignore_adler32 */ - unsigned ignore_crc; /*ignore CRC checksums*/ - unsigned ignore_critical; /*ignore unknown critical chunks*/ - unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/ - /* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable - errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some - strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters - in string keys, etc... */ - - unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ -}; - -/*The settings, state and information for extended encoding and decoding.*/ -struct LodePNGState -{ - LodePNGDecoderSettings decoder; /*the decoding settings*/ - LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ - LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ - unsigned error; -}; - -void lodepng_state_init(LodePNGState* state); -void lodepng_state_cleanup(LodePNGState* state); -unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize); -unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize); - -#endif //_TVG_LODEPNG_H_ diff --git a/thirdparty/thorvg/src/loaders/png/tvgPngLoader.cpp b/thirdparty/thorvg/src/loaders/png/tvgPngLoader.cpp deleted file mode 100644 index 3e293176b7..0000000000 --- a/thirdparty/thorvg/src/loaders/png/tvgPngLoader.cpp +++ /dev/null @@ -1,194 +0,0 @@ -/* - * Copyright (c) 2021 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ -#include <memory.h> -#include "tvgLoader.h" -#include "tvgPngLoader.h" - - -/************************************************************************/ -/* Internal Class Implementation */ -/************************************************************************/ - - -static inline uint32_t PREMULTIPLY(uint32_t c) -{ - auto a = (c >> 24); - return (c & 0xff000000) + ((((c >> 8) & 0xff) * a) & 0xff00) + ((((c & 0x00ff00ff) * a) >> 8) & 0x00ff00ff); -} - - -static void _premultiply(uint32_t* data, uint32_t w, uint32_t h) -{ - auto buffer = data; - for (uint32_t y = 0; y < h; ++y, buffer += w) { - auto src = buffer; - for (uint32_t x = 0; x < w; ++x, ++src) { - *src = PREMULTIPLY(*src); - } - } -} - - -void PngLoader::clear() -{ - lodepng_state_cleanup(&state); - - if (freeData) free(data); - data = nullptr; - size = 0; - freeData = false; -} - - -/************************************************************************/ -/* External Class Implementation */ -/************************************************************************/ - -PngLoader::PngLoader() -{ - lodepng_state_init(&state); -} - - -PngLoader::~PngLoader() -{ - if (freeData) free(data); - free(image); -} - - -bool PngLoader::open(const string& path) -{ - clear(); - - auto pngFile = fopen(path.c_str(), "rb"); - if (!pngFile) return false; - - auto ret = false; - - //determine size - if (fseek(pngFile, 0, SEEK_END) < 0) goto finalize; - if (((size = ftell(pngFile)) < 1)) goto finalize; - if (fseek(pngFile, 0, SEEK_SET)) goto finalize; - - data = (unsigned char *) malloc(size); - if (!data) goto finalize; - - freeData = true; - - if (fread(data, size, 1, pngFile) < 1) goto failure; - - lodepng_state_init(&state); - - unsigned int width, height; - if (lodepng_inspect(&width, &height, &state, data, size) > 0) goto failure; - - w = static_cast<float>(width); - h = static_cast<float>(height); - ret = true; - - goto finalize; - -failure: - clear(); - -finalize: - fclose(pngFile); - return ret; -} - - -bool PngLoader::open(const char* data, uint32_t size, bool copy) -{ - clear(); - - lodepng_state_init(&state); - - unsigned int width, height; - if (lodepng_inspect(&width, &height, &state, (unsigned char*)(data), size) > 0) return false; - - if (copy) { - this->data = (unsigned char *) malloc(size); - if (!this->data) return false; - memcpy((unsigned char *)this->data, data, size); - freeData = true; - } else { - this->data = (unsigned char *) data; - freeData = false; - } - - w = static_cast<float>(width); - h = static_cast<float>(height); - this->size = size; - - return true; -} - - -bool PngLoader::read() -{ - if (!data || w <= 0 || h <= 0) return false; - - TaskScheduler::request(this); - - return true; -} - - -bool PngLoader::close() -{ - this->done(); - clear(); - return true; -} - - -unique_ptr<Surface> PngLoader::bitmap() -{ - this->done(); - - if (!image) return nullptr; - - auto surface = static_cast<Surface*>(malloc(sizeof(Surface))); - surface->buffer = (uint32_t*)(image); - surface->stride = w; - surface->w = w; - surface->h = h; - surface->cs = SwCanvas::ARGB8888; - - return unique_ptr<Surface>(surface); -} - - -void PngLoader::run(unsigned tid) -{ - if (image) { - free(image); - image = nullptr; - } - auto width = static_cast<unsigned>(w); - auto height = static_cast<unsigned>(h); - - lodepng_decode(&image, &width, &height, &state, data, size); - - _premultiply((uint32_t*)(image), width, height); -} diff --git a/thirdparty/thorvg/src/loaders/png/tvgPngLoader.h b/thirdparty/thorvg/src/loaders/png/tvgPngLoader.h deleted file mode 100644 index 8f07f6418f..0000000000 --- a/thirdparty/thorvg/src/loaders/png/tvgPngLoader.h +++ /dev/null @@ -1,54 +0,0 @@ -/* - * Copyright (c) 2021 - 2022 Samsung Electronics Co., Ltd. All rights reserved. - - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - - * The above copyright notice and this permission notice shall be included in all - * copies or substantial portions of the Software. - - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ -#ifndef _TVG_PNG_LOADER_H_ -#define _TVG_PNG_LOADER_H_ - -#include "tvgLodePng.h" -#include "tvgTaskScheduler.h" - - -class PngLoader : public LoadModule, public Task -{ -private: - LodePNGState state; - unsigned char* data = nullptr; - unsigned char *image = nullptr; - unsigned long size = 0; - bool freeData = false; - - void clear(); - -public: - PngLoader(); - ~PngLoader(); - - using LoadModule::open; - bool open(const string& path) override; - bool open(const char* data, uint32_t size, bool copy) override; - bool read() override; - bool close() override; - - unique_ptr<Surface> bitmap() override; - void run(unsigned tid) override; -}; - -#endif //_TVG_PNG_LOADER_H_ diff --git a/thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp b/thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp index d7c51bdc30..c373da2dd5 100644 --- a/thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp +++ b/thirdparty/thorvg/src/loaders/svg/tvgXmlParser.cpp @@ -26,8 +26,8 @@ #ifdef _WIN32 #include <malloc.h> -#elif defined(__FreeBSD__) - #include <stdlib.h> +#elif __FreeBSD__ + #include<stdlib.h> #else #include <alloca.h> #endif @@ -390,7 +390,7 @@ bool simpleXmlParse(const char* buf, unsigned bufLength, bool strip, simpleXMLCb if (p) { //Invalid case: '<' nested - if (*p == '<') return false; + if (*p == '<' && type != SimpleXMLType::Doctype) return false; const char *start, *end; start = itr + 1 + toff; diff --git a/thirdparty/thorvg/src/loaders/tvg/tvgTvgBinInterpreter.cpp b/thirdparty/thorvg/src/loaders/tvg/tvgTvgBinInterpreter.cpp index 66de860aaa..62a75ecd3d 100644 --- a/thirdparty/thorvg/src/loaders/tvg/tvgTvgBinInterpreter.cpp +++ b/thirdparty/thorvg/src/loaders/tvg/tvgTvgBinInterpreter.cpp @@ -23,8 +23,8 @@ #ifdef _WIN32 #include <malloc.h> -#elif defined(__FreeBSD__) - #include <stdlib.h> +#elif __FreeBSD__ + #include<stdlib.h> #else #include <alloca.h> #endif |