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/*************************************************************************/
/* image_loader_png.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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 "core/os/os.h"
#include "core/string/print_string.h"
#include "drivers/png/png_driver_common.h"
#include <string.h>
Error ImageLoaderPNG::load_image(Ref<Image> p_image, FileAccess *f, bool p_force_linear, float p_scale) {
const uint64_t buffer_size = f->get_length();
Vector<uint8_t> file_buffer;
Error err = file_buffer.resize(buffer_size);
if (err) {
f->close();
return err;
}
{
uint8_t *writer = file_buffer.ptrw();
f->get_buffer(writer, buffer_size);
f->close();
}
const uint8_t *reader = file_buffer.ptr();
return PNGDriverCommon::png_to_image(reader, buffer_size, p_force_linear, p_image);
}
void ImageLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("png");
}
Ref<Image> ImageLoaderPNG::load_mem_png(const uint8_t *p_png, int p_size) {
Ref<Image> img;
img.instance();
// the value of p_force_linear does not matter since it only applies to 16 bit
Error err = PNGDriverCommon::png_to_image(p_png, p_size, false, img);
ERR_FAIL_COND_V(err, Ref<Image>());
return img;
}
Ref<Image> ImageLoaderPNG::lossless_unpack_png(const Vector<uint8_t> &p_data) {
const int len = p_data.size();
ERR_FAIL_COND_V(len < 4, Ref<Image>());
const uint8_t *r = p_data.ptr();
ERR_FAIL_COND_V(r[0] != 'P' || r[1] != 'N' || r[2] != 'G' || r[3] != ' ', Ref<Image>());
return load_mem_png(&r[4], len - 4);
}
Vector<uint8_t> ImageLoaderPNG::lossless_pack_png(const Ref<Image> &p_image) {
Vector<uint8_t> out_buffer;
// add Godot's own "PNG " prefix
if (out_buffer.resize(4) != OK) {
ERR_FAIL_V(Vector<uint8_t>());
}
// scope for writer lifetime
{
// must be closed before call to image_to_png
uint8_t *writer = out_buffer.ptrw();
memcpy(writer, "PNG ", 4);
}
Error err = PNGDriverCommon::image_to_png(p_image, out_buffer);
if (err) {
ERR_FAIL_V(Vector<uint8_t>());
}
return out_buffer;
}
ImageLoaderPNG::ImageLoaderPNG() {
Image::_png_mem_loader_func = load_mem_png;
Image::png_unpacker = lossless_unpack_png;
Image::png_packer = lossless_pack_png;
}
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