Function PadSprites

src/spritecache.cpp:321–362

}

static bool PadSprites(SpriteLoader::SpriteCollection &sprite, ZoomLevels sprite_avail, SpriteEncoder *encoder)
{
	/* Get minimum top left corner coordinates. */
	int min_xoffs = INT32_MAX;
	int min_yoffs = INT32_MAX;
	for (ZoomLevel zoom : sprite_avail) {
		min_xoffs = std::min(min_xoffs, ScaleByZoom(sprite[zoom].x_offs, zoom));
		min_yoffs = std::min(min_yoffs, ScaleByZoom(sprite[zoom].y_offs, zoom));
	}

	/* Get maximum dimensions taking necessary padding at the top left into account. */
	int max_width  = INT32_MIN;
	int max_height = INT32_MIN;
	for (ZoomLevel zoom : sprite_avail) {
		max_width  = std::max(max_width, ScaleByZoom(sprite[zoom].width + sprite[zoom].x_offs - UnScaleByZoom(min_xoffs, zoom), zoom));
		max_height = std::max(max_height, ScaleByZoom(sprite[zoom].height + sprite[zoom].y_offs - UnScaleByZoom(min_yoffs, zoom), zoom));
	}

	/* Align height and width if required to match the needs of the sprite encoder. */
	uint align = encoder->GetSpriteAlignment();
	if (align != 0) {
		max_width  = Align(max_width,  align);
		max_height = Align(max_height, align);
	}

	/* Pad sprites where needed. */
	for (ZoomLevel zoom : sprite_avail) {
		auto &cur_sprite = sprite[zoom];
		/* Scaling the sprite dimensions in the blitter is done with rounding up,
		 * so a negative padding here is not an error. */
		int pad_left = std::max(0, cur_sprite.x_offs - UnScaleByZoom(min_xoffs, zoom));
		int pad_top = std::max(0, cur_sprite.y_offs - UnScaleByZoom(min_yoffs, zoom));
		int pad_right = std::max(0, UnScaleByZoom(max_width, zoom) - cur_sprite.width - pad_left);
		int pad_bottom = std::max(0, UnScaleByZoom(max_height, zoom) - cur_sprite.height - pad_top);

		if (pad_left > 0 || pad_right > 0 || pad_top > 0 || pad_bottom > 0) {
			if (!PadSingleSprite(&cur_sprite, zoom, pad_left, pad_top, pad_right, pad_bottom)) return false;
		}
	}

	return true;
}

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