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<h1 id="mask-alpha">Mask Alpha 编辑</h1>
<p><code>operators/mask_tool.py</code> 定义 <code>EditImageAlpha</code> 和 <code>MaskTool</code>,使用 <code>common/viewport.py</code> 的 <code>ImageGesture</code> 管理 Lasso、Brush 与 Polyline。</p>
<pre class="mermaid"><code>flowchart TD
A[冻结 Scene 的 Gesture、Mode、Radius] --&gt; B[屏幕手势与 Overlay]
B --&gt; C[完成后投影并生成覆盖 M]
C --&gt; D[读取源 RGBA]
D --&gt; E[按模式计算 Alpha]
E --&gt; F[保留 RGB 和源画布尺寸]
F --&gt; G[替换 Packed Image 并提交一个 Undo]</code></pre>
<table>
<thead>
<tr>
<th>模式</th>
<th>源 Alpha A 与覆盖 M 的结果</th>
</tr>
</thead>
<tbody>
<tr>
<td>Set</td>
<td><code>A × M</code></td>
</tr>
<tr>
<td>Extend</td>
<td><code>max(A, M)</code></td>
</tr>
<tr>
<td>Subtract</td>
<td><code>A × (1 − M)</code></td>
</tr>
</tbody>
</table>
<p>Brush 拖动时维护简化屏幕路径、圆形印记与连接条的并集预览;释放时一次生成图片覆盖。Polyline 使用逐点路径,至少三个点后通过闭合圈、双击或 Enter 完成,Backspace 删除末点。</p>
<p>结果保留 Empty 的身份、矩阵、显示尺寸和偏移。全透明结果有效,取消或切换工具清理未提交的 Overlay;共享 Image 通过统一替换入口分流。</p>
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