Preserve texture compression when saving a revised skp from debugger

debugger/QT/SkDebuggerGUI.cpp

Index: debugger/QT/SkDebuggerGUI.cpp
diff --git a/debugger/QT/SkDebuggerGUI.cpp b/debugger/QT/SkDebuggerGUI.cpp
index a8d8f14c21715e6a34419ae777543135a7556e77..42df29e83c5e8b6c279d0cf427bd6751d9e70a06 100644
--- a/debugger/QT/SkDebuggerGUI.cpp
+++ b/debugger/QT/SkDebuggerGUI.cpp
@@ -355,11 +355,23 @@ void SkDebuggerGUI::drawComplete() {
     fInspectorWidget.setClip(fDebugger.getCurrentClip());
 }
 
+// Encodes to PNG, unless there is already encoded data, in which case that gets
+// used.
+class PngPixelSerializer : public SkPixelSerializer {

[scroggo, 2015/03/20 17:21:41]

I think this is the third instance of this. It may be time to consolidate.

+public:
+    bool onUseEncodedData(const void*, size_t) SK_OVERRIDE { return true; }
+    SkData* onEncodePixels(const SkImageInfo& info, const void* pixels,
+                           size_t rowBytes) SK_OVERRIDE {
+        return SkImageEncoder::EncodeData(info, pixels, rowBytes, SkImageEncoder::kPNG_Type, 100);
+    }
+};
+
 void SkDebuggerGUI::saveToFile(const SkString& filename) {
     SkFILEWStream file(filename.c_str());
     SkAutoTUnref<SkPicture> copy(fDebugger.copyPicture());
 
-    copy->serialize(&file);
+    PngPixelSerializer serializer;
+    copy->serialize(&file, &serializer);
 }
 
 void SkDebuggerGUI::loadFile(QListWidgetItem *item) {