Added --deepColor option to SampleApp, triggers creation of a ten-bit/channel buffer on Windows.

samplecode/SampleApp.h

 /*
  * Copyright 2011 Skia
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SampleApp_DEFINED
 #define SampleApp_DEFINED
 
@@ skipping 56 matching lines @@
      * SampleApp ports can subclass this manager class if they want to:
      *      * filter the types of devices supported
      *      * customize plugging of SkBaseDevice objects into an SkCanvas
      *      * customize publishing the results of draw to the OS window
      *      * manage GrContext / GrRenderTarget lifetimes
      */
     class DeviceManager : public SkRefCnt {
     public:
 
 
-        virtual void setUpBackend(SampleWindow* win, int msaaSampleCount) = 0;
+        virtual void setUpBackend(SampleWindow* win, int msaaSampleCount, bool deepColor) = 0;
 
         virtual void tearDownBackend(SampleWindow* win) = 0;
 
         // called before drawing. should install correct device
         // type on the canvas. Will skip drawing if returns false.
         virtual SkSurface* createSurface(DeviceType dType, SampleWindow* win) = 0;
 
         // called after drawing, should get the results onto the
         // screen.
         virtual void publishCanvas(DeviceType dType,
                                    SkCanvas* canvas,
                                    SampleWindow* win) = 0;
 
         // called when window changes size, guaranteed to be called
         // at least once before first draw (after init)
         virtual void windowSizeChanged(SampleWindow* win) = 0;
 
         // return the GrContext backing gpu devices (nullptr if not built with GPU support)
         virtual GrContext* getGrContext() = 0;
 
         // return the GrRenderTarget backing gpu devices (nullptr if not built with GPU support)
         virtual GrRenderTarget* getGrRenderTarget() = 0;
+
+        // return the color depth of the output device
+        virtual int getColorBits() = 0;
+
     private:
         typedef SkRefCnt INHERITED;
     };
 
     SampleWindow(void* hwnd, int argc, char** argv, DeviceManager*);
     virtual ~SampleWindow();
 
     SkSurface* createSurface() override {
         SkSurface* surface = nullptr;
         if (fDevManager) {
@@ skipping 95 matching lines @@
 
     SkOSMenu::TriState fLCDState;
     SkOSMenu::TriState fAAState;
     SkOSMenu::TriState fSubpixelState;
     int fHintingState;
     int fPixelGeometryIndex;
     int fFilterQualityIndex;
     unsigned   fFlipAxis;
 
     int fMSAASampleCount;
+    bool fDeepColor;
 
     SkScalar fZoomCenterX, fZoomCenterY;
 
     //Stores global settings
     SkOSMenu* fAppMenu; // We pass ownership to SkWindow, when we call addMenu
     //Stores slide specific settings
     SkOSMenu* fSlideMenu; // We pass ownership to SkWindow, when we call addMenu
 
     void loadView(SkView*);
     void updateTitle();
     bool getRawTitle(SkString*);
 
     bool zoomIn();
     bool zoomOut();
     void updatePointer(int x, int y);
     void magnify(SkCanvas* canvas);
     void showZoomer(SkCanvas* canvas);
     void updateMatrix();
     void postAnimatingEvent();
     int findByTitle(const char*);
     void listTitles();
     SkSize tileSize() const;
     bool sendAnimatePulse();
 
     typedef SkOSWindow INHERITED;
 };
 
 #endif