Function SaveState_ReadScreenshot

pcsx2/SaveState.cpp:845–922

}

static bool SaveState_ReadScreenshot(zip_t* zf, u32* out_width, u32* out_height, std::vector<u32>* out_pixels)
{
	auto zff = zip_fopen_managed(zf, EntryFilename_Screenshot, 0);
	if (!zff)
		return false;

	png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
	if (!png_ptr)
		return false;

	png_infop info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr)
	{
		png_destroy_read_struct(&png_ptr, nullptr, nullptr);
		return false;
	}

	ScopedGuard cleanup([&png_ptr, &info_ptr]() {
		png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
	});

	if (setjmp(png_jmpbuf(png_ptr)))
		return false;

	png_set_read_fn(png_ptr, zff.get(), [](png_structp png_ptr, png_bytep data_ptr, png_size_t size) {
		zip_fread(static_cast<zip_file_t*>(png_get_io_ptr(png_ptr)), data_ptr, size);
	});

	png_read_info(png_ptr, info_ptr);

	png_uint_32 width = 0;
	png_uint_32 height = 0;
	int bitDepth = 0;
	int colorType = -1;
	if (png_get_IHDR(png_ptr, info_ptr, &width, &height, &bitDepth, &colorType, nullptr, nullptr, nullptr) != 1 ||
		width == 0 || height == 0)
	{
		return false;
	}

	const png_uint_32 bytesPerRow = png_get_rowbytes(png_ptr, info_ptr);
	std::vector<u8> rowData(bytesPerRow);

	*out_width = width;
	*out_height = height;
	out_pixels->resize(width * height);

	for (u32 y = 0; y < height; y++)
	{
		png_read_row(png_ptr, static_cast<png_bytep>(rowData.data()), nullptr);

		const u8* row_ptr = rowData.data();
		u32* out_ptr = &out_pixels->at(y * width);
		if (colorType == PNG_COLOR_TYPE_RGB)
		{
			for (u32 x = 0; x < width; x++)
			{
				u32 pixel = static_cast<u32>(*(row_ptr)++);