Function PadSingleSprite

src/spritecache.cpp:272–319

}

static bool PadSingleSprite(SpriteLoader::Sprite *sprite, ZoomLevel zoom, uint pad_left, uint pad_top, uint pad_right, uint pad_bottom)
{
	uint width  = sprite->width + pad_left + pad_right;
	uint height = sprite->height + pad_top + pad_bottom;

	if (width > UINT16_MAX || height > UINT16_MAX) return false;

	/* Copy source data and reallocate sprite memory. */
	size_t sprite_size = static_cast<size_t>(sprite->width) * sprite->height;
	std::vector<SpriteLoader::CommonPixel> src_data(sprite->data, sprite->data + sprite_size);
	sprite->AllocateData(zoom, static_cast<size_t>(width) * height);

	/* Copy with padding to destination. */
	SpriteLoader::CommonPixel *src = src_data.data();
	SpriteLoader::CommonPixel *data = sprite->data;
	for (uint y = 0; y < height; y++) {
		if (y < pad_top || pad_bottom + y >= height) {
			/* Top/bottom padding. */
			std::fill_n(data, width, SpriteLoader::CommonPixel{});
			data += width;
		} else {
			if (pad_left > 0) {
				/* Pad left. */
				std::fill_n(data, pad_left, SpriteLoader::CommonPixel{});
				data += pad_left;
			}

			/* Copy pixels. */
			std::copy_n(src, sprite->width, data);
			src += sprite->width;
			data += sprite->width;

			if (pad_right > 0) {
				/* Pad right. */
				std::fill_n(data, pad_right, SpriteLoader::CommonPixel{});
				data += pad_right;
			}
		}
	}

	/* Update sprite size. */
	sprite->width   = width;
	sprite->height  = height;
	sprite->x_offs -= pad_left;
	sprite->y_offs -= pad_top;

	return true;
}

static bool PadSprites(SpriteLoader::SpriteCollection &sprite, ZoomLevels sprite_avail, SpriteEncoder *encoder)
{