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/*
* Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved.
* 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 "tvgLoader.h"
#include "tvgPngLoader.h"
static inline uint32_t PREMULTIPLY(uint32_t c)
{
auto a = (c >> 24);
return (c & 0xff000000) + ((((c >> 8) & 0xff) * a) & 0xff00) + ((((c & 0x00ff00ff) * a) >> 8) & 0x00ff00ff);
}
static void _premultiply(uint32_t* data, uint32_t w, uint32_t h)
{
auto buffer = data;
for (uint32_t y = 0; y < h; ++y, buffer += w) {
auto src = buffer;
for (uint32_t x = 0; x < w; ++x, ++src) {
*src = PREMULTIPLY(*src);
}
}
}
PngLoader::PngLoader()
{
image = static_cast<png_imagep>(calloc(1, sizeof(png_image)));
image->version = PNG_IMAGE_VERSION;
image->opaque = NULL;
}
PngLoader::~PngLoader()
{
if (content) {
free((void*)content);
content = nullptr;
}
free(image);
}
bool PngLoader::open(const string& path)
{
image->opaque = NULL;
if (!png_image_begin_read_from_file(image, path.c_str())) return false;
w = (float)image->width;
h = (float)image->height;
return true;
}
bool PngLoader::open(const char* data, uint32_t size, bool copy)
{
image->opaque = NULL;
if (!png_image_begin_read_from_memory(image, data, size)) return false;
w = (float)image->width;
h = (float)image->height;
return true;
}
bool PngLoader::read()
{
png_bytep buffer;
image->format = PNG_FORMAT_BGRA;
buffer = static_cast<png_bytep>(malloc(PNG_IMAGE_SIZE((*image))));
if (!buffer) {
//out of memory, only time when libpng doesnt free its data
png_image_free(image);
return false;
}
if (!png_image_finish_read(image, NULL, buffer, 0, NULL)) return false;
content = reinterpret_cast<uint32_t*>(buffer);
_premultiply(reinterpret_cast<uint32_t*>(buffer), image->width, image->height);
return true;
}
bool PngLoader::close()
{
png_image_free(image);
return true;
}
unique_ptr<Surface> PngLoader::bitmap()
{
if (!content) return nullptr;
auto surface = static_cast<Surface*>(malloc(sizeof(Surface)));
surface->buffer = (uint32_t*)(content);
surface->stride = w;
surface->w = w;
surface->h = h;
surface->cs = SwCanvas::ARGB8888;
return unique_ptr<Surface>(surface);
}
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