Method SpriteEffect

src/cache.cpp:465–523

}

BitmapRef Cache::SpriteEffect(const BitmapRef& src_bitmap, const Rect& rect, bool flip_x, bool flip_y, const Tone& tone, const Color& blend) {
	std::string id = ToString(src_bitmap->GetId());

	if (id.empty()) {
		// Log causes false positives when empty bitmaps or placeholder (checkerboard)
		// bitmaps are used.
		//Output::Debug("Bitmap has no ID. Please report a bug!");
		id = fmt::format("{}", (void*)(src_bitmap.get()));
	}

	const effect_key_type key {
		id,
		src_bitmap->GetTransparent(),
		rect,
		flip_x,
		flip_y,
		tone,
		blend
	};

	const auto it = cache_effects.find(key);

	if (it == cache_effects.end() || it->second.expired()) {
		BitmapRef bitmap_effects;

		auto create = [&rect] () -> BitmapRef {
			return Bitmap::Create(rect.width, rect.height, true);
		};

		if (tone != Tone()) {
			bitmap_effects = create();
			bitmap_effects->ToneBlit(0, 0, *src_bitmap, rect, tone, Opacity::Opaque());
		}

		if (blend != Color()) {
			if (bitmap_effects) {
				// Tone blit was applied
				bitmap_effects->BlendBlit(0, 0, *bitmap_effects, bitmap_effects->GetRect(), blend, Opacity::Opaque());
			} else {
				bitmap_effects = create();
				bitmap_effects->BlendBlit(0, 0, *src_bitmap, rect, blend, Opacity::Opaque());
			}
		}

		if (flip_x || flip_y) {
			if (bitmap_effects) {
				// Tone or blend blit was applied
				bitmap_effects->Flip(flip_x, flip_y);
			} else {
				bitmap_effects = create();
				bitmap_effects->FlipBlit(0, 0, *src_bitmap, rect, flip_x, flip_y, Opacity::Opaque());
			}
		}

		assert(bitmap_effects && "Effect cache used but no effect applied!");

		return(cache_effects[key] = bitmap_effects).lock();
	} else { return it->second.lock(); }