修复频谱图bug

render_2D/render/Blend2D_Cache.cpp

@@ -222,11 +222,22 @@ Painter::~Painter() {
         context_.end();
 }
 
-void Painter::clip(RectF value) {
+Painter::Clip_Scope::Clip_Scope(Painter& painter, RectF value) {
     value = value.normalized();
-    if (!active_ || value.empty())
+    if (!painter.active_ || value.empty())
         return;
-    context_.clip_to_rect(BLRect(value.x, value.y, value.width, value.height));
+    painter.context_.save();
+    painter.context_.clip_to_rect(BLRect(value.x, value.y, value.width, value.height));
+    painter_ = &painter;
+}
+
+Painter::Clip_Scope::~Clip_Scope() {
+    if (painter_)
+        painter_->context_.restore();
+}
+
+Painter::Clip_Scope Painter::scoped_clip(RectF value) {
+    return Clip_Scope(*this, value);
 }
 
 void Painter::composite(const Blend2D_Color_Cache& source) {