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Diffstat (limited to 'drivers/png/image_loader_png.cpp')
-rw-r--r--drivers/png/image_loader_png.cpp433
1 files changed, 433 insertions, 0 deletions
diff --git a/drivers/png/image_loader_png.cpp b/drivers/png/image_loader_png.cpp
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+++ b/drivers/png/image_loader_png.cpp
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+/*************************************************************************/
+/* image_loader_png.cpp */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* http://www.godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
+/* */
+/* 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 "image_loader_png.h"
+
+#include "print_string.h"
+#include "os/os.h"
+
+void ImageLoaderPNG::_read_png_data(png_structp png_ptr,png_bytep data, png_size_t p_length) {
+
+ FileAccess *f = (FileAccess*)png_get_io_ptr(png_ptr);
+ f->get_buffer( (uint8_t*)data, p_length );
+}
+
+/*
+png_structp png_ptr = png_create_read_struct_2
+ (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+ user_error_fn, user_warning_fn, (png_voidp)
+ user_mem_ptr, user_malloc_fn, user_free_fn);
+*/
+static png_voidp _png_malloc_fn(png_structp png_ptr, png_size_t size) {
+
+ return memalloc(size);
+}
+
+static void _png_free_fn(png_structp png_ptr, png_voidp ptr) {
+
+ memfree(ptr);
+}
+
+static void _png_error_function(png_structp, png_const_charp text) {
+
+ ERR_PRINT(text);
+}
+
+static void _png_warn_function(png_structp, png_const_charp text) {
+
+ ERR_PRINT(text);
+}
+
+typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
+
+Error ImageLoaderPNG::_load_image(void *rf_up,png_rw_ptr p_func,Image *p_image) {
+
+
+
+ png_structp png;
+ png_infop info;
+
+ //png = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL, NULL, NULL);
+
+ png = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,_png_error_function,_png_warn_function,(png_voidp)NULL,
+ _png_malloc_fn,_png_free_fn );
+
+ ERR_FAIL_COND_V(!png, ERR_OUT_OF_MEMORY);
+
+ info = png_create_info_struct(png);
+ if (!info) {
+ png_destroy_read_struct(&png,NULL,NULL);
+ ERR_PRINT("Out of Memory");
+ return ERR_OUT_OF_MEMORY;
+ }
+
+ if (setjmp(png_jmpbuf(png))) {
+
+ png_destroy_read_struct(&png,NULL,NULL);
+ ERR_PRINT("PNG Corrupted");
+ return ERR_FILE_CORRUPT;
+ }
+
+ png_set_read_fn(png,(void*)rf_up,p_func);
+
+ png_uint_32 width, height;
+ int depth, color;
+
+
+ png_read_info(png, info);
+ png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
+
+ /*
+ printf("Image width:%i\n", width);
+ printf("Image Height:%i\n", height);
+ printf("Bit depth:%i\n", depth);
+ printf("Color type:%i\n", color);
+ */
+
+ if (depth<8) { //only bit dept 8 per channel is handled
+
+ png_set_packing(png);
+ };
+
+ if (depth > 8) {
+ png_set_strip_16(png);
+ png_read_update_info(png, info);
+ }
+
+ int palette_colors = 0;
+ int palette_components = 0;
+ int components = 0;
+
+ Image::Format fmt;
+ switch(color) {
+
+
+ case PNG_COLOR_TYPE_GRAY: {
+
+ fmt=Image::FORMAT_GRAYSCALE;
+ components=1;
+ } break;
+ case PNG_COLOR_TYPE_GRAY_ALPHA: {
+
+ fmt=Image::FORMAT_GRAYSCALE_ALPHA;
+ components=2;
+ } break;
+ case PNG_COLOR_TYPE_RGB: {
+
+ fmt=Image::FORMAT_RGB;
+ components=3;
+ } break;
+ case PNG_COLOR_TYPE_RGB_ALPHA: {
+
+ fmt=Image::FORMAT_RGBA;
+ components=4;
+ } break;
+ case PNG_COLOR_TYPE_PALETTE: {
+
+ int ntrans = 0;
+ png_get_tRNS(png, info, NULL, &ntrans, NULL);
+ //printf("transparent colors %i\n", ntrans);
+
+ fmt = ntrans > 0 ? Image::FORMAT_INDEXED_ALPHA : Image::FORMAT_INDEXED;
+ palette_components = ntrans > 0 ? 4 : 3;
+ components = 1;
+
+ png_colorp colors;
+ png_get_PLTE(png, info, &colors, &palette_colors);
+
+ } break;
+ default: {
+
+ ERR_PRINT("INVALID PNG TYPE");
+ png_destroy_read_struct(&png, &info, NULL);
+ return ERR_UNAVAILABLE;
+ } break;
+ }
+
+ //int rowsize = png_get_rowbytes(png, info);
+ int rowsize = components * width;
+
+ DVector<uint8_t> dstbuff;
+
+ dstbuff.resize( rowsize * height + palette_components * 256 ); // alloc the entire palette? - yes always
+
+ DVector<uint8_t>::Write dstbuff_write = dstbuff.write();
+
+ uint8_t* data = dstbuff_write.ptr();
+
+ uint8_t **row_p = memnew_arr( uint8_t*, height );
+
+ for (unsigned int i = 0; i < height; i++) {
+ row_p[i] = &data[components*width*i];
+ }
+
+ png_read_image(png, (png_bytep*)row_p);
+
+ if (palette_colors) {
+
+ uint8_t *r_pal = &data[components*width*height]; // end of the array
+ png_colorp colors;
+ int num;
+ png_get_PLTE(png, info, &colors, &num);
+
+ int ofs = 0;
+ for (int i=0; i < palette_colors; i++) {
+
+ r_pal[ofs + 0] = colors[i].red;
+ r_pal[ofs + 1] = colors[i].green;
+ r_pal[ofs + 2] = colors[i].blue;
+ if (palette_components == 4) {
+ r_pal[ofs + 3] = 255;
+ };
+ ofs += palette_components;
+ };
+
+ if (fmt == Image::FORMAT_INDEXED_ALPHA) {
+ png_color_16p alphas;
+ png_bytep alpha_idx;
+ int count;
+ png_get_tRNS(png, info, &alpha_idx, &count, &alphas);
+ for (int i=0; i<count; i++) {
+
+ //printf("%i: loading alpha fron transparent color %i, values %i, %i, %i, %i, %i\n", i, (int)alpha_idx[i], (int)alphas[i].index, (int)alphas[i].red, (int)alphas[i].green, (int)alphas[i].blue, (int)alphas[i].gray);
+ //r_pal[alpha_idx[i]] = alphas[i].gray >> 8;
+ r_pal[i*4+3] = alpha_idx[i];
+ };
+ };
+ };
+
+ memdelete_arr( row_p );
+
+ p_image->create( width, height, 0,fmt, dstbuff );
+
+ png_destroy_read_struct(&png, &info, NULL );
+
+ return OK;
+}
+
+
+Error ImageLoaderPNG::load_image(Image *p_image,FileAccess *f) {
+
+ Error err = _load_image(f,_read_png_data,p_image);
+ f->close();
+
+
+ return err;
+
+}
+
+void ImageLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
+
+ p_extensions->push_back("png");
+}
+
+
+struct PNGReadStatus {
+
+ int offset;
+ const unsigned char *image;
+};
+
+static void user_read_data(png_structp png_ptr,png_bytep data, png_size_t p_length) {
+
+ PNGReadStatus *rstatus;
+ rstatus=(PNGReadStatus*)png_get_io_ptr(png_ptr);
+
+ memcpy(data,&rstatus->image[rstatus->offset],p_length);
+ rstatus->offset+=p_length;
+}
+
+
+static Image _load_mem_png(const uint8_t* p_png) {
+
+
+ PNGReadStatus prs;
+ prs.image=p_png;
+ prs.offset=0;
+
+ Image img;
+ Error err = ImageLoaderPNG::_load_image(&prs,user_read_data,&img);
+ ERR_FAIL_COND_V(err,Image());
+
+ return img;
+}
+
+
+static Image _lossless_unpack_png(const DVector<uint8_t>& p_data) {
+
+ DVector<uint8_t>::Read r = p_data.read();
+ ERR_FAIL_COND_V(r[0]!='P' || r[1]!='N' || r[2]!='G' || r[3]!=' ',Image());
+ return _load_mem_png(&r[4]);
+
+}
+
+static void _write_png_data(png_structp png_ptr,png_bytep data, png_size_t p_length) {
+
+ DVector<uint8_t> &v = *(DVector<uint8_t>*)png_get_io_ptr(png_ptr);
+ int vs = v.size();
+
+ v.resize(vs+p_length);
+ DVector<uint8_t>::Write w = v.write();
+ copymem(&w[vs],data,p_length);
+ //print_line("png write: "+itos(p_length));
+}
+
+
+static DVector<uint8_t> _lossless_pack_png(const Image& p_image) {
+
+
+ Image img = p_image;
+ if (img.get_format() > Image::FORMAT_INDEXED_ALPHA)
+ img.decompress();
+
+
+ ERR_FAIL_COND_V(img.get_format() > Image::FORMAT_INDEXED_ALPHA, DVector<uint8_t>());
+
+ png_structp png_ptr;
+ png_infop info_ptr;
+ png_bytep * row_pointers;
+
+
+ /* initialize stuff */
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+
+ ERR_FAIL_COND_V(!png_ptr,DVector<uint8_t>());
+
+ info_ptr = png_create_info_struct(png_ptr);
+
+ ERR_FAIL_COND_V(!info_ptr,DVector<uint8_t>());
+
+ if (setjmp(png_jmpbuf(png_ptr))) {
+ ERR_FAIL_V(DVector<uint8_t>());
+ }
+ DVector<uint8_t> ret;
+ ret.push_back('P');
+ ret.push_back('N');
+ ret.push_back('G');
+ ret.push_back(' ');
+
+ png_set_write_fn(png_ptr,&ret,_write_png_data,NULL);
+
+ /* write header */
+ if (setjmp(png_jmpbuf(png_ptr))) {
+ ERR_FAIL_V(DVector<uint8_t>());
+ }
+
+ int pngf=0;
+ int pngb=8;
+ int cs=0;
+
+ switch(img.get_format()) {
+
+ case Image::FORMAT_GRAYSCALE: {
+
+ pngf=PNG_COLOR_TYPE_GRAY;
+ cs=1;
+ } break;
+ case Image::FORMAT_GRAYSCALE_ALPHA: {
+
+ pngf=PNG_COLOR_TYPE_GRAY_ALPHA;
+ cs=2;
+ } break;
+ case Image::FORMAT_RGB: {
+
+ pngf=PNG_COLOR_TYPE_RGB;
+ cs=3;
+ } break;
+ case Image::FORMAT_RGBA: {
+
+ pngf=PNG_COLOR_TYPE_RGB_ALPHA;
+ cs=4;
+ } break;
+ default: {
+
+ if (img.detect_alpha()) {
+
+ img.convert(Image::FORMAT_RGBA);
+ pngf=PNG_COLOR_TYPE_RGB_ALPHA;
+ cs=4;
+ } else {
+
+ img.convert(Image::FORMAT_RGB);
+ pngf=PNG_COLOR_TYPE_RGB;
+ cs=3;
+ }
+
+ }
+ }
+
+ int w = img.get_width();
+ int h = img.get_height();
+ png_set_IHDR(png_ptr, info_ptr, w,h,
+ 8, pngf, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+
+ png_write_info(png_ptr, info_ptr);
+
+
+ /* write bytes */
+ if (setjmp(png_jmpbuf(png_ptr))) {
+ ERR_FAIL_V(DVector<uint8_t>());
+ }
+
+
+ DVector<uint8_t>::Read r = img.get_data().read();
+
+ row_pointers = (png_bytep*)memalloc(sizeof(png_bytep)*h);
+ for(int i=0;i<h;i++) {
+
+ row_pointers[i]=(png_bytep)&r[i*w*cs];
+ }
+ png_write_image(png_ptr, row_pointers);
+
+ memfree(row_pointers);
+
+ /* end write */
+ if (setjmp(png_jmpbuf(png_ptr))) {
+
+ ERR_FAIL_V(DVector<uint8_t>());
+ }
+
+ png_write_end(png_ptr, NULL);
+
+
+ return ret;
+}
+
+ImageLoaderPNG::ImageLoaderPNG() {
+
+ Image::_png_mem_loader_func=_load_mem_png;
+ Image::lossless_unpacker=_lossless_unpack_png;
+ Image::lossless_packer=_lossless_pack_png;
+
+
+}
+
+
+
+
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