Function ResizeSprites

src/spritecache.cpp:364–407

}

static bool ResizeSprites(SpriteLoader::SpriteCollection &sprite, ZoomLevels sprite_avail, SpriteEncoder *encoder)
{
	/* Create a fully zoomed image if it does not exist */
	ZoomLevel first_avail = ZoomLevel::End;
	for (ZoomLevel zoom = ZoomLevel::Min; zoom <= ZoomLevel::Max; ++zoom) {
		if (!sprite_avail.Test(zoom)) continue;
		first_avail = zoom;
		if (zoom != ZoomLevel::Min) {
			if (!ResizeSpriteIn(sprite, zoom, ZoomLevel::Min)) return false;
			sprite_avail.Set(ZoomLevel::Min);
		}
		break;
	}

	/* Pad sprites to make sizes match. */
	if (!PadSprites(sprite, sprite_avail, encoder)) return false;

	/* Create other missing zoom levels */
	for (ZoomLevel zoom = ZoomLevel::Begin; zoom != ZoomLevel::End; zoom++) {
		if (zoom == ZoomLevel::Min) continue;

		if (sprite_avail.Test(zoom)) {
			/* Check that size and offsets match the fully zoomed image. */
			[[maybe_unused]] const auto &root_sprite = sprite[ZoomLevel::Min];
			[[maybe_unused]] const auto &dest_sprite = sprite[zoom];
			assert(dest_sprite.width == UnScaleByZoom(root_sprite.width, zoom));
			assert(dest_sprite.height == UnScaleByZoom(root_sprite.height, zoom));
			assert(dest_sprite.x_offs == UnScaleByZoom(root_sprite.x_offs, zoom));
			assert(dest_sprite.y_offs == UnScaleByZoom(root_sprite.y_offs, zoom));
		} else {
			/* Zoom level is not available, or unusable, so create it */
			ResizeSpriteOut(sprite, zoom);
		}
	}

	/* Replace sprites with higher resolution than the desired maximum source resolution with scaled up sprites, if not already done. */
	if (first_avail < _settings_client.gui.sprite_zoom_min) {
		for (ZoomLevel zoom = std::min(ZoomLevel::Normal, _settings_client.gui.sprite_zoom_min); zoom > ZoomLevel::Min; --zoom) {
			ResizeSpriteIn(sprite, zoom, zoom - 1);
		}
	}

	return  true;
}

/**
 * Load a recolour sprite into memory.