Function ResizeSpriteOut

src/spritecache.cpp:236–270

}

static void ResizeSpriteOut(SpriteLoader::SpriteCollection &sprite, ZoomLevel zoom)
{
	const auto &root_sprite = sprite.Root();
	const auto &src_sprite = sprite[zoom - 1];
	auto &dest_sprite = sprite[zoom];

	/* Algorithm based on 32bpp_Optimized::ResizeSprite() */
	dest_sprite.width = UnScaleByZoom(root_sprite.width, zoom);
	dest_sprite.height = UnScaleByZoom(root_sprite.height, zoom);
	dest_sprite.x_offs = UnScaleByZoom(root_sprite.x_offs, zoom);
	dest_sprite.y_offs = UnScaleByZoom(root_sprite.y_offs, zoom);
	dest_sprite.colours = root_sprite.colours;

	dest_sprite.AllocateData(zoom, static_cast<size_t>(dest_sprite.height) * dest_sprite.width);

	SpriteLoader::CommonPixel *dst = dest_sprite.data;
	const SpriteLoader::CommonPixel *src = src_sprite.data;
	[[maybe_unused]] const SpriteLoader::CommonPixel *src_end = src + src_sprite.height * src_sprite.width;

	for (uint y = 0; y < dest_sprite.height; y++) {
		const SpriteLoader::CommonPixel *src_ln = src + src_sprite.width;
		assert(src_ln <= src_end);
		for (uint x = 0; x < dest_sprite.width; x++) {
			assert(src < src_ln);
			if (src + 1 != src_ln && (src + 1)->a != 0) {
				*dst = *(src + 1);
			} else {
				*dst = *src;
			}
			dst++;
			src += 2;
		}
		src = src_ln + src_sprite.width;
	}
}

static bool PadSingleSprite(SpriteLoader::Sprite *sprite, ZoomLevel zoom, uint pad_left, uint pad_top, uint pad_right, uint pad_bottom)
{