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Diffstat (limited to 'thirdparty/jpeg-compressor/jpgd.h')
| -rw-r--r-- | thirdparty/jpeg-compressor/jpgd.h | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/thirdparty/jpeg-compressor/jpgd.h b/thirdparty/jpeg-compressor/jpgd.h new file mode 100644 index 0000000000..150b9a0b26 --- /dev/null +++ b/thirdparty/jpeg-compressor/jpgd.h @@ -0,0 +1,319 @@ +// jpgd.h - C++ class for JPEG decompression. +// Public domain, Rich Geldreich <richgel99@gmail.com> +#ifndef JPEG_DECODER_H +#define JPEG_DECODER_H + +#include <stdlib.h> +#include <stdio.h> +#include <setjmp.h> + +#ifdef _MSC_VER + #define JPGD_NORETURN __declspec(noreturn) +#elif defined(__GNUC__) + #define JPGD_NORETURN __attribute__ ((noreturn)) +#else + #define JPGD_NORETURN +#endif + +namespace jpgd +{ + typedef unsigned char uint8; + typedef signed short int16; + typedef unsigned short uint16; + typedef unsigned int uint; + typedef signed int int32; + + // Loads a JPEG image from a memory buffer or a file. + // req_comps can be 1 (grayscale), 3 (RGB), or 4 (RGBA). + // On return, width/height will be set to the image's dimensions, and actual_comps will be set to the either 1 (grayscale) or 3 (RGB). + // Notes: For more control over where and how the source data is read, see the decompress_jpeg_image_from_stream() function below, or call the jpeg_decoder class directly. + // Requesting a 8 or 32bpp image is currently a little faster than 24bpp because the jpeg_decoder class itself currently always unpacks to either 8 or 32bpp. + unsigned char *decompress_jpeg_image_from_memory(const unsigned char *pSrc_data, int src_data_size, int *width, int *height, int *actual_comps, int req_comps); + unsigned char *decompress_jpeg_image_from_file(const char *pSrc_filename, int *width, int *height, int *actual_comps, int req_comps); + + // Success/failure error codes. + enum jpgd_status + { + JPGD_SUCCESS = 0, JPGD_FAILED = -1, JPGD_DONE = 1, + JPGD_BAD_DHT_COUNTS = -256, JPGD_BAD_DHT_INDEX, JPGD_BAD_DHT_MARKER, JPGD_BAD_DQT_MARKER, JPGD_BAD_DQT_TABLE, + JPGD_BAD_PRECISION, JPGD_BAD_HEIGHT, JPGD_BAD_WIDTH, JPGD_TOO_MANY_COMPONENTS, + JPGD_BAD_SOF_LENGTH, JPGD_BAD_VARIABLE_MARKER, JPGD_BAD_DRI_LENGTH, JPGD_BAD_SOS_LENGTH, + JPGD_BAD_SOS_COMP_ID, JPGD_W_EXTRA_BYTES_BEFORE_MARKER, JPGD_NO_ARITHMITIC_SUPPORT, JPGD_UNEXPECTED_MARKER, + JPGD_NOT_JPEG, JPGD_UNSUPPORTED_MARKER, JPGD_BAD_DQT_LENGTH, JPGD_TOO_MANY_BLOCKS, + JPGD_UNDEFINED_QUANT_TABLE, JPGD_UNDEFINED_HUFF_TABLE, JPGD_NOT_SINGLE_SCAN, JPGD_UNSUPPORTED_COLORSPACE, + JPGD_UNSUPPORTED_SAMP_FACTORS, JPGD_DECODE_ERROR, JPGD_BAD_RESTART_MARKER, JPGD_ASSERTION_ERROR, + JPGD_BAD_SOS_SPECTRAL, JPGD_BAD_SOS_SUCCESSIVE, JPGD_STREAM_READ, JPGD_NOTENOUGHMEM + }; + + // Input stream interface. + // Derive from this class to read input data from sources other than files or memory. Set m_eof_flag to true when no more data is available. + // The decoder is rather greedy: it will keep on calling this method until its internal input buffer is full, or until the EOF flag is set. + // It the input stream contains data after the JPEG stream's EOI (end of image) marker it will probably be pulled into the internal buffer. + // Call the get_total_bytes_read() method to determine the actual size of the JPEG stream after successful decoding. + class jpeg_decoder_stream + { + public: + jpeg_decoder_stream() { } + virtual ~jpeg_decoder_stream() { } + + // The read() method is called when the internal input buffer is empty. + // Parameters: + // pBuf - input buffer + // max_bytes_to_read - maximum bytes that can be written to pBuf + // pEOF_flag - set this to true if at end of stream (no more bytes remaining) + // Returns -1 on error, otherwise return the number of bytes actually written to the buffer (which may be 0). + // Notes: This method will be called in a loop until you set *pEOF_flag to true or the internal buffer is full. + virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag) = 0; + }; + + // stdio FILE stream class. + class jpeg_decoder_file_stream : public jpeg_decoder_stream + { + jpeg_decoder_file_stream(const jpeg_decoder_file_stream &); + jpeg_decoder_file_stream &operator =(const jpeg_decoder_file_stream &); + + FILE *m_pFile; + bool m_eof_flag, m_error_flag; + + public: + jpeg_decoder_file_stream(); + virtual ~jpeg_decoder_file_stream(); + + bool open(const char *Pfilename); + void close(); + + virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag); + }; + + // Memory stream class. + class jpeg_decoder_mem_stream : public jpeg_decoder_stream + { + const uint8 *m_pSrc_data; + uint m_ofs, m_size; + + public: + jpeg_decoder_mem_stream() : m_pSrc_data(NULL), m_ofs(0), m_size(0) { } + jpeg_decoder_mem_stream(const uint8 *pSrc_data, uint size) : m_pSrc_data(pSrc_data), m_ofs(0), m_size(size) { } + + virtual ~jpeg_decoder_mem_stream() { } + + bool open(const uint8 *pSrc_data, uint size); + void close() { m_pSrc_data = NULL; m_ofs = 0; m_size = 0; } + + virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag); + }; + + // Loads JPEG file from a jpeg_decoder_stream. + unsigned char *decompress_jpeg_image_from_stream(jpeg_decoder_stream *pStream, int *width, int *height, int *actual_comps, int req_comps); + + enum + { + JPGD_IN_BUF_SIZE = 8192, JPGD_MAX_BLOCKS_PER_MCU = 10, JPGD_MAX_HUFF_TABLES = 8, JPGD_MAX_QUANT_TABLES = 4, + JPGD_MAX_COMPONENTS = 4, JPGD_MAX_COMPS_IN_SCAN = 4, JPGD_MAX_BLOCKS_PER_ROW = 8192, JPGD_MAX_HEIGHT = 16384, JPGD_MAX_WIDTH = 16384 + }; + + typedef int16 jpgd_quant_t; + typedef int16 jpgd_block_t; + + class jpeg_decoder + { + public: + // Call get_error_code() after constructing to determine if the stream is valid or not. You may call the get_width(), get_height(), etc. + // methods after the constructor is called. You may then either destruct the object, or begin decoding the image by calling begin_decoding(), then decode() on each scanline. + jpeg_decoder(jpeg_decoder_stream *pStream); + + ~jpeg_decoder(); + + // Call this method after constructing the object to begin decompression. + // If JPGD_SUCCESS is returned you may then call decode() on each scanline. + int begin_decoding(); + + // Returns the next scan line. + // For grayscale images, pScan_line will point to a buffer containing 8-bit pixels (get_bytes_per_pixel() will return 1). + // Otherwise, it will always point to a buffer containing 32-bit RGBA pixels (A will always be 255, and get_bytes_per_pixel() will return 4). + // Returns JPGD_SUCCESS if a scan line has been returned. + // Returns JPGD_DONE if all scan lines have been returned. + // Returns JPGD_FAILED if an error occurred. Call get_error_code() for a more info. + int decode(const void** pScan_line, uint* pScan_line_len); + + inline jpgd_status get_error_code() const { return m_error_code; } + + inline int get_width() const { return m_image_x_size; } + inline int get_height() const { return m_image_y_size; } + + inline int get_num_components() const { return m_comps_in_frame; } + + inline int get_bytes_per_pixel() const { return m_dest_bytes_per_pixel; } + inline int get_bytes_per_scan_line() const { return m_image_x_size * get_bytes_per_pixel(); } + + // Returns the total number of bytes actually consumed by the decoder (which should equal the actual size of the JPEG file). + inline int get_total_bytes_read() const { return m_total_bytes_read; } + + private: + jpeg_decoder(const jpeg_decoder &); + jpeg_decoder &operator =(const jpeg_decoder &); + + typedef void (*pDecode_block_func)(jpeg_decoder *, int, int, int); + + struct huff_tables + { + bool ac_table; + uint look_up[256]; + uint look_up2[256]; + uint8 code_size[256]; + uint tree[512]; + }; + + struct coeff_buf + { + uint8 *pData; + int block_num_x, block_num_y; + int block_len_x, block_len_y; + int block_size; + }; + + struct mem_block + { + mem_block *m_pNext; + size_t m_used_count; + size_t m_size; + char m_data[1]; + }; + + jmp_buf m_jmp_state; + mem_block *m_pMem_blocks; + int m_image_x_size; + int m_image_y_size; + jpeg_decoder_stream *m_pStream; + int m_progressive_flag; + uint8 m_huff_ac[JPGD_MAX_HUFF_TABLES]; + uint8* m_huff_num[JPGD_MAX_HUFF_TABLES]; // pointer to number of Huffman codes per bit size + uint8* m_huff_val[JPGD_MAX_HUFF_TABLES]; // pointer to Huffman codes per bit size + jpgd_quant_t* m_quant[JPGD_MAX_QUANT_TABLES]; // pointer to quantization tables + int m_scan_type; // Gray, Yh1v1, Yh1v2, Yh2v1, Yh2v2 (CMYK111, CMYK4114 no longer supported) + int m_comps_in_frame; // # of components in frame + int m_comp_h_samp[JPGD_MAX_COMPONENTS]; // component's horizontal sampling factor + int m_comp_v_samp[JPGD_MAX_COMPONENTS]; // component's vertical sampling factor + int m_comp_quant[JPGD_MAX_COMPONENTS]; // component's quantization table selector + int m_comp_ident[JPGD_MAX_COMPONENTS]; // component's ID + int m_comp_h_blocks[JPGD_MAX_COMPONENTS]; + int m_comp_v_blocks[JPGD_MAX_COMPONENTS]; + int m_comps_in_scan; // # of components in scan + int m_comp_list[JPGD_MAX_COMPS_IN_SCAN]; // components in this scan + int m_comp_dc_tab[JPGD_MAX_COMPONENTS]; // component's DC Huffman coding table selector + int m_comp_ac_tab[JPGD_MAX_COMPONENTS]; // component's AC Huffman coding table selector + int m_spectral_start; // spectral selection start + int m_spectral_end; // spectral selection end + int m_successive_low; // successive approximation low + int m_successive_high; // successive approximation high + int m_max_mcu_x_size; // MCU's max. X size in pixels + int m_max_mcu_y_size; // MCU's max. Y size in pixels + int m_blocks_per_mcu; + int m_max_blocks_per_row; + int m_mcus_per_row, m_mcus_per_col; + int m_mcu_org[JPGD_MAX_BLOCKS_PER_MCU]; + int m_total_lines_left; // total # lines left in image + int m_mcu_lines_left; // total # lines left in this MCU + int m_real_dest_bytes_per_scan_line; + int m_dest_bytes_per_scan_line; // rounded up + int m_dest_bytes_per_pixel; // 4 (RGB) or 1 (Y) + huff_tables* m_pHuff_tabs[JPGD_MAX_HUFF_TABLES]; + coeff_buf* m_dc_coeffs[JPGD_MAX_COMPONENTS]; + coeff_buf* m_ac_coeffs[JPGD_MAX_COMPONENTS]; + int m_eob_run; + int m_block_y_mcu[JPGD_MAX_COMPONENTS]; + uint8* m_pIn_buf_ofs; + int m_in_buf_left; + int m_tem_flag; + bool m_eof_flag; + uint8 m_in_buf_pad_start[128]; + uint8 m_in_buf[JPGD_IN_BUF_SIZE + 128]; + uint8 m_in_buf_pad_end[128]; + int m_bits_left; + uint m_bit_buf; + int m_restart_interval; + int m_restarts_left; + int m_next_restart_num; + int m_max_mcus_per_row; + int m_max_blocks_per_mcu; + int m_expanded_blocks_per_mcu; + int m_expanded_blocks_per_row; + int m_expanded_blocks_per_component; + bool m_freq_domain_chroma_upsample; + int m_max_mcus_per_col; + uint m_last_dc_val[JPGD_MAX_COMPONENTS]; + jpgd_block_t* m_pMCU_coefficients; + int m_mcu_block_max_zag[JPGD_MAX_BLOCKS_PER_MCU]; + uint8* m_pSample_buf; + int m_crr[256]; + int m_cbb[256]; + int m_crg[256]; + int m_cbg[256]; + uint8* m_pScan_line_0; + uint8* m_pScan_line_1; + jpgd_status m_error_code; + bool m_ready_flag; + int m_total_bytes_read; + + void free_all_blocks(); + JPGD_NORETURN void stop_decoding(jpgd_status status); + void *alloc(size_t n, bool zero = false); + void word_clear(void *p, uint16 c, uint n); + void prep_in_buffer(); + void read_dht_marker(); + void read_dqt_marker(); + void read_sof_marker(); + void skip_variable_marker(); + void read_dri_marker(); + void read_sos_marker(); + int next_marker(); + int process_markers(); + void locate_soi_marker(); + void locate_sof_marker(); + int locate_sos_marker(); + void init(jpeg_decoder_stream * pStream); + void create_look_ups(); + void fix_in_buffer(); + void transform_mcu(int mcu_row); + void transform_mcu_expand(int mcu_row); + coeff_buf* coeff_buf_open(int block_num_x, int block_num_y, int block_len_x, int block_len_y); + inline jpgd_block_t *coeff_buf_getp(coeff_buf *cb, int block_x, int block_y); + void load_next_row(); + void decode_next_row(); + void make_huff_table(int index, huff_tables *pH); + void check_quant_tables(); + void check_huff_tables(); + void calc_mcu_block_order(); + int init_scan(); + void init_frame(); + void process_restart(); + void decode_scan(pDecode_block_func decode_block_func); + void init_progressive(); + void init_sequential(); + void decode_start(); + void decode_init(jpeg_decoder_stream * pStream); + void H2V2Convert(); + void H2V1Convert(); + void H1V2Convert(); + void H1V1Convert(); + void gray_convert(); + void expanded_convert(); + void find_eoi(); + inline uint get_char(); + inline uint get_char(bool *pPadding_flag); + inline void stuff_char(uint8 q); + inline uint8 get_octet(); + inline uint get_bits(int num_bits); + inline uint get_bits_no_markers(int numbits); + inline int huff_decode(huff_tables *pH); + inline int huff_decode(huff_tables *pH, int& extrabits); + static inline uint8 clamp(int i); + static void decode_block_dc_first(jpeg_decoder *pD, int component_id, int block_x, int block_y); + static void decode_block_dc_refine(jpeg_decoder *pD, int component_id, int block_x, int block_y); + static void decode_block_ac_first(jpeg_decoder *pD, int component_id, int block_x, int block_y); + static void decode_block_ac_refine(jpeg_decoder *pD, int component_id, int block_x, int block_y); + }; + +} // namespace jpgd + +#endif // JPEG_DECODER_H |