104 lines
4.2 KiB
C++
104 lines
4.2 KiB
C++
/*************************************************************************/
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/* image_loader_png.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "image_loader_png.h"
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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#include "drivers/png/png_driver_common.h"
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#include <string.h>
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Error ImageLoaderPNG::load_image(Ref<Image> p_image, Ref<FileAccess> f, bool p_force_linear, float p_scale) {
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const uint64_t buffer_size = f->get_length();
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Vector<uint8_t> file_buffer;
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Error err = file_buffer.resize(buffer_size);
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if (err) {
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return err;
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}
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{
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uint8_t *writer = file_buffer.ptrw();
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f->get_buffer(writer, buffer_size);
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}
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const uint8_t *reader = file_buffer.ptr();
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return PNGDriverCommon::png_to_image(reader, buffer_size, p_force_linear, p_image);
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}
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void ImageLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("png");
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}
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Ref<Image> ImageLoaderPNG::load_mem_png(const uint8_t *p_png, int p_size) {
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Ref<Image> img;
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img.instantiate();
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// the value of p_force_linear does not matter since it only applies to 16 bit
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Error err = PNGDriverCommon::png_to_image(p_png, p_size, false, img);
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ERR_FAIL_COND_V(err, Ref<Image>());
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return img;
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}
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Ref<Image> ImageLoaderPNG::lossless_unpack_png(const Vector<uint8_t> &p_data) {
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const int len = p_data.size();
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ERR_FAIL_COND_V(len < 4, Ref<Image>());
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const uint8_t *r = p_data.ptr();
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ERR_FAIL_COND_V(r[0] != 'P' || r[1] != 'N' || r[2] != 'G' || r[3] != ' ', Ref<Image>());
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return load_mem_png(&r[4], len - 4);
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}
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Vector<uint8_t> ImageLoaderPNG::lossless_pack_png(const Ref<Image> &p_image) {
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Vector<uint8_t> out_buffer;
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// add Godot's own "PNG " prefix
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if (out_buffer.resize(4) != OK) {
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ERR_FAIL_V(Vector<uint8_t>());
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}
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// scope for writer lifetime
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{
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// must be closed before call to image_to_png
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uint8_t *writer = out_buffer.ptrw();
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memcpy(writer, "PNG ", 4);
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}
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Error err = PNGDriverCommon::image_to_png(p_image, out_buffer);
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if (err) {
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ERR_FAIL_V(Vector<uint8_t>());
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}
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return out_buffer;
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}
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ImageLoaderPNG::ImageLoaderPNG() {
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Image::_png_mem_loader_func = load_mem_png;
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Image::png_unpacker = lossless_unpack_png;
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Image::png_packer = lossless_pack_png;
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}
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