godot/drivers/png/resource_saver_png.cpp
2014-02-09 22:10:30 -03:00

183 lines
5.2 KiB
C++

/*************************************************************************/
/* resource_saver_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 "resource_saver_png.h"
#include "scene/resources/texture.h"
#include "drivers/png/png.h"
#include "os/file_access.h"
static void _write_png_data(png_structp png_ptr,png_bytep data, png_size_t p_length) {
FileAccess *f = (FileAccess*)png_get_io_ptr(png_ptr);
f->store_buffer( (const uint8_t*)data,p_length);
}
Error ResourceSaverPNG::save(const String &p_path,const RES& p_resource,uint32_t p_flags) {
Ref<ImageTexture> texture=p_resource;
ERR_FAIL_COND_V(!texture.is_valid(),ERR_INVALID_PARAMETER);
ERR_EXPLAIN("Can't save empty texture as PNG");
ERR_FAIL_COND_V(!texture->get_width() || !texture->get_height(),ERR_INVALID_PARAMETER);
Image img = texture->get_data();
if (img.get_format() > Image::FORMAT_INDEXED_ALPHA)
img.decompress();
ERR_FAIL_COND_V(img.get_format() > Image::FORMAT_INDEXED_ALPHA, ERR_INVALID_PARAMETER);
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,ERR_CANT_CREATE);
info_ptr = png_create_info_struct(png_ptr);
ERR_FAIL_COND_V(!info_ptr,ERR_CANT_CREATE);
if (setjmp(png_jmpbuf(png_ptr))) {
ERR_FAIL_V(ERR_CANT_OPEN);
}
//change this
Error err;
FileAccess* f = FileAccess::open(p_path,FileAccess::WRITE,&err);
if (err) {
ERR_FAIL_V(err);
}
png_set_write_fn(png_ptr,f,_write_png_data,NULL);
/* write header */
if (setjmp(png_jmpbuf(png_ptr))) {
ERR_FAIL_V(ERR_CANT_OPEN);
}
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))) {
memdelete(f);
ERR_FAIL_V(ERR_CANT_OPEN);
}
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))) {
memdelete(f);
ERR_FAIL_V(ERR_CANT_OPEN);
}
png_write_end(png_ptr, NULL);
memdelete(f);
/* cleanup heap allocation */
return OK;
}
bool ResourceSaverPNG::recognize(const RES& p_resource) const {
return (p_resource.is_valid() && p_resource->is_type("ImageTexture"));
}
void ResourceSaverPNG::get_recognized_extensions(const RES& p_resource,List<String> *p_extensions) const{
if (p_resource->cast_to<Texture>()) {
p_extensions->push_back("png");
}
}