f91c6dc2ebaf7d21bff3bc431c38376f68ddaeff
- canvas尺寸改为精确匹配bitmap尺寸,不再只增不减 - 仅在尺寸真正变化时才设置canvas.width/height(避免不必要的画布清空) - 移除每帧绘制前的clearRect调用(消除透明闪烁) - fit模式下用黑色fillRect替代clearRect填充边缘区域 - stretch模式下drawImage覆盖全画布,无需额外清除
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