Function ResizeSpriteIn

src/spritecache.cpp:207–234

}

static bool ResizeSpriteIn(SpriteLoader::SpriteCollection &sprite, ZoomLevel src, ZoomLevel tgt)
{
	uint8_t scaled_1 = AdjustByZoom(1, src - tgt);
	const auto &src_sprite = sprite[src];
	auto &dest_sprite = sprite[tgt];

	/* Check for possible memory overflow. */
	if (src_sprite.width * scaled_1 > UINT16_MAX || src_sprite.height * scaled_1 > UINT16_MAX) return false;

	dest_sprite.width = src_sprite.width * scaled_1;
	dest_sprite.height = src_sprite.height * scaled_1;
	dest_sprite.x_offs = src_sprite.x_offs * scaled_1;
	dest_sprite.y_offs = src_sprite.y_offs * scaled_1;
	dest_sprite.colours = src_sprite.colours;

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

	SpriteLoader::CommonPixel *dst = dest_sprite.data;
	for (int y = 0; y < dest_sprite.height; y++) {
		const SpriteLoader::CommonPixel *src_ln = &src_sprite.data[y / scaled_1 * src_sprite.width];
		for (int x = 0; x < dest_sprite.width; x++) {
			*dst = src_ln[x / scaled_1];
			dst++;
		}
	}

	return true;
}

static void ResizeSpriteOut(SpriteLoader::SpriteCollection &sprite, ZoomLevel zoom)
{