Graphics: Taint entire Bitmap in #snap_to_bitmap

src/bitmap.cpp

@@ -1045,6 +1045,11 @@ void Bitmap::bindTex(ShaderBase &shader)
 	p->bindTexture(shader);
 }
 
+void Bitmap::taintArea(const IntRect &rect)
+{
+	p->addTaintedArea(rect);
+}
+
 void Bitmap::releaseResources()
 {
 	if (p->megaSurface)

src/bitmap.h

@@ -116,6 +116,9 @@ public:
 	 * texture size uniform in shader */
 	void bindTex(ShaderBase &shader);
 
+	/* Adds 'rect' to tainted area */
+	void taintArea(const IntRect &rect);
+
 	sigc::signal<void> modified;
 
 private:

src/graphics.cpp

@@ -779,6 +779,9 @@ Bitmap *Graphics::snapToBitmap()
 
 	p->compositeToBuffer(bitmap->getGLTypes().fbo);
 
+	/* Taint entire bitmap */
+	bitmap->taintArea(IntRect(0, 0, width(), height()));
+
 	return bitmap;
 }