godot/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 */
/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
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/* */
/* 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"
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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);
png_textp t;
//https://svn.gov.pt/projects/ccidadao/repository/middleware-offline/trunk/_src/eidmw/FreeImagePTEiD/Source/FreeImage/PluginPNG.cpp
//png_get_text(png,info,)
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/*
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);
}
if (png_get_valid(png,info,PNG_INFO_tRNS)) {
// png_set_expand_gray_1_2_4_to_8(png);
png_set_tRNS_to_alpha(png);
png_read_update_info(png, info);
png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
}
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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;
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int size;
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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);
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int to_read=p_length;
if (rstatus->size>=0) {
to_read = MIN( p_length, rstatus->size - rstatus->offset);
}
memcpy(data,&rstatus->image[rstatus->offset],to_read);
rstatus->offset+=to_read;
if (to_read<p_length) {
memset(&data[to_read],0,p_length-to_read);
}
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}
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static Image _load_mem_png(const uint8_t* p_png,int p_size) {
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PNGReadStatus prs;
prs.image=p_png;
prs.offset=0;
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prs.size=p_size;
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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) {
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int len = p_data.size();
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DVector<uint8_t>::Read r = p_data.read();
ERR_FAIL_COND_V(r[0]!='P' || r[1]!='N' || r[2]!='G' || r[3]!=' ',Image());
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return _load_mem_png(&r[4],len-4);
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}
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() {
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Image::_png_mem_loader_func=_load_mem_png;
Image::lossless_unpacker=_lossless_unpack_png;
Image::lossless_packer=_lossless_pack_png;
}