mirror of
https://github.com/thorvg/thorvg.git
synced 2025-06-18 14:08:05 +00:00
a39e70fb88
enhance decoding efficiency by determining the desired canvas format during image loading. This allows loaders to preemptively decode the image in the specified format, to not convert the format again.
113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "tvgPngLoader.h"
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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void PngLoader::clear()
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{
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png_image_free(image);
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free(image);
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image = nullptr;
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}
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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PngLoader::PngLoader() : ImageLoader(FileType::Png)
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{
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image = static_cast<png_imagep>(calloc(1, sizeof(png_image)));
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image->version = PNG_IMAGE_VERSION;
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image->opaque = NULL;
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}
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PngLoader::~PngLoader()
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{
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clear();
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free((void*)surface.buf32);
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}
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bool PngLoader::open(const string& path)
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{
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image->opaque = NULL;
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if (!png_image_begin_read_from_file(image, path.c_str())) return false;
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w = (float)image->width;
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h = (float)image->height;
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return true;
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}
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bool PngLoader::open(const char* data, uint32_t size, bool copy)
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{
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image->opaque = NULL;
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if (!png_image_begin_read_from_memory(image, data, size)) return false;
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w = (float)image->width;
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h = (float)image->height;
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return true;
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}
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bool PngLoader::read()
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{
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if (!LoadModule::read()) return true;
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if (w == 0 || h == 0) return false;
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if (cs == ColorSpace::ARGB8888 || cs == ColorSpace::ARGB8888S) {
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image->format = PNG_FORMAT_BGRA;
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surface.cs = ColorSpace::ARGB8888;
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} else {
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image->format = PNG_FORMAT_RGBA;
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surface.cs = ColorSpace::ABGR8888;
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}
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auto buffer = static_cast<png_bytep>(malloc(PNG_IMAGE_SIZE((*image))));
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if (!png_image_finish_read(image, NULL, buffer, 0, NULL)) {
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free(buffer);
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return false;
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}
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//setup the surface
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surface.buf32 = reinterpret_cast<uint32_t*>(buffer);
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surface.stride = (uint32_t)w;
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surface.w = (uint32_t)w;
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surface.h = (uint32_t)h;
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surface.channelSize = sizeof(uint32_t);
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//TODO: we can acquire a pre-multiplied image. See "png_structrp"
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surface.premultiplied = false;
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clear();
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return true;
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}
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