Method loadTexture

packages/fairygui/src/render/RenderBridge.ts:153–186

* Load or get cached texture * 加载或获取缓存的纹理

(
        url: string,
        source?: ImageBitmap | HTMLImageElement | HTMLCanvasElement | ImageData
    )

     * 加载或获取缓存的纹理
     */
    public async loadTexture(
        url: string,
        source?: ImageBitmap | HTMLImageElement | HTMLCanvasElement | ImageData
    ): Promise<ITextureHandle | null> {
        // Check cache first
        const cached = this._textureCache.get(url);
        if (cached) {
            cached.lastUsedFrame = this._currentFrame;
            cached.refCount++;
            return cached.handle;
        }

        // Load or create texture
        let textureSource = source;
        if (!textureSource) {
            try {
                const response = await fetch(url);
                const blob = await response.blob();
                textureSource = await createImageBitmap(blob);
            } catch (error) {
                console.error(`Failed to load texture: ${url}`, error);
                return null;
            }
        }

        const handle = this._backend.createTexture(textureSource);
        this._textureCache.set(url, {
            handle,
            lastUsedFrame: this._currentFrame,
            refCount: 1
        });

        return handle;
    }

    /**
     * Release a texture reference