Orphan ProcXfermode, with an eye towards removing it

src/utils/debugger/SkDebugCanvas.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkColorPriv.h"
@@ skipping 74 matching lines @@
             fCommandVector[i]->execute(&canvas);
         }
         if (prev != bitmap.getColor(0,0)) {
             layer = i;
         }
         prev = bitmap.getColor(0,0);
     }
     return layer;
 }
 
-static SkPMColor OverdrawXferModeProc(SkPMColor src, SkPMColor dst) {
-    // This table encodes the color progression of the overdraw visualization
-    static const SkPMColor gTable[] = {
-        SkPackARGB32(0x00, 0x00, 0x00, 0x00),
-        SkPackARGB32(0xFF, 128, 158, 255),
-        SkPackARGB32(0xFF, 170, 185, 212),
-        SkPackARGB32(0xFF, 213, 195, 170),
-        SkPackARGB32(0xFF, 255, 192, 127),
-        SkPackARGB32(0xFF, 255, 185, 85),
-        SkPackARGB32(0xFF, 255, 165, 42),
-        SkPackARGB32(0xFF, 255, 135, 0),
-        SkPackARGB32(0xFF, 255,  95, 0),
-        SkPackARGB32(0xFF, 255,  50, 0),
-        SkPackARGB32(0xFF, 255,  0, 0)
-    };
-
-    for (size_t i = 0; i < SK_ARRAY_COUNT(gTable)-1; ++i) {
-        if (gTable[i] == dst) {
-            return gTable[i+1];
+class OverdrawXfermode : public SkXfermode {
+public:
+    virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const SK_OVERRIDE {
+        // This table encodes the color progression of the overdraw visualization
+        static const SkPMColor gTable[] = {
+            SkPackARGB32(0x00, 0x00, 0x00, 0x00),
+            SkPackARGB32(0xFF, 128, 158, 255),
+            SkPackARGB32(0xFF, 170, 185, 212),
+            SkPackARGB32(0xFF, 213, 195, 170),
+            SkPackARGB32(0xFF, 255, 192, 127),
+            SkPackARGB32(0xFF, 255, 185, 85),
+            SkPackARGB32(0xFF, 255, 165, 42),
+            SkPackARGB32(0xFF, 255, 135, 0),
+            SkPackARGB32(0xFF, 255,  95, 0),
+            SkPackARGB32(0xFF, 255,  50, 0),
+            SkPackARGB32(0xFF, 255,  0, 0)
+        };
+        
+        for (size_t i = 0; i < SK_ARRAY_COUNT(gTable)-1; ++i) {
+            if (gTable[i] == dst) {
+                return gTable[i+1];
+            }
         }
+        
+        return gTable[SK_ARRAY_COUNT(gTable)-1];
     }
 
-    return gTable[SK_ARRAY_COUNT(gTable)-1];
-}
+    virtual Factory getFactory() const SK_OVERRIDE { return NULL; }
+#ifndef SK_IGNORE_TO_STRING
+    virtual void toString(SkString* str) const { str->set("OverdrawXfermode"); }
+#endif
+};
 
 // The OverdrawFilter modifies every paint to use an SkProcXfermode which
 // in turn invokes OverdrawXferModeProc
 class SkOverdrawFilter : public SkDrawFilter {
 public:
     SkOverdrawFilter() {
-        fXferMode = SkProcXfermode::Create(OverdrawXferModeProc);
+        fXferMode = SkNEW(OverdrawXfermode);
     }
 
     virtual ~SkOverdrawFilter() {
         delete fXferMode;
     }
 
     virtual bool filter(SkPaint* p, Type) SK_OVERRIDE {
         p->setXfermode(fXferMode);
         return true;
     }
@@ skipping 439 matching lines @@
 
 void SkDebugCanvas::didSetMatrix(const SkMatrix& matrix) {
     this->addDrawCommand(new SkSetMatrixCommand(matrix));
     this->INHERITED::didSetMatrix(matrix);
 }
 
 void SkDebugCanvas::toggleCommand(int index, bool toggle) {
     SkASSERT(index < fCommandVector.count());
     fCommandVector[index]->setVisible(toggle);
 }