5e24611241
Wrapped libpng usage in a pair of functions under PNGDriverCommon, which convert between Godot Image and png data. Switched to libpng 1.6 simplified API for ease of maintenance. Implemented ImageLoaderPNG and ResourceSaverPNG in terms of PNGDriverCommon functions. Travis, switched to builtin libpng (thus builtin freetype and zlib also) so we can build on Xenial.
112 lines
4.2 KiB
C++
112 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) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 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/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, FileAccess *f, bool p_force_linear, float p_scale) {
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const size_t buffer_size = f->get_len();
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PoolVector<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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f->close();
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return err;
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}
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{
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PoolVector<uint8_t>::Write writer = file_buffer.write();
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f->get_buffer(writer.ptr(), buffer_size);
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f->close();
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}
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PoolVector<uint8_t>::Read reader = file_buffer.read();
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return PNGDriverCommon::png_to_image(reader.ptr(), buffer_size, 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.instance();
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Error err = PNGDriverCommon::png_to_image(p_png, p_size, 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 PoolVector<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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PoolVector<uint8_t>::Read r = p_data.read();
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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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PoolVector<uint8_t> ImageLoaderPNG::lossless_pack_png(const Ref<Image> &p_image) {
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PoolVector<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(PoolVector<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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PoolVector<uint8_t>::Write writer = out_buffer.write();
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copymem(writer.ptr(), "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(PoolVector<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::lossless_unpacker = lossless_unpack_png;
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Image::lossless_packer = lossless_pack_png;
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}
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