Add DeviceManager to SampleWindow

Review URL: http://codereview.appspot.com/4715045/


git-svn-id: http://skia.googlecode.com/svn/trunk@1857 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 49 insertions, 16 deletions

diff --git a/samplecode/SampleApp.h b/samplecode/SampleApp.h
index 9b47b8e0dd..770d620690 100644
--- a/samplecode/SampleApp.h
+++ b/samplecode/SampleApp.h
@@ -44,7 +44,48 @@ enum SkTriState {
 class SampleWindow : public SkOSWindow {
     SkTDArray<SkViewFactory> fSamples;
 public:
-    SampleWindow(void* hwnd, int argc, char** argv);
+    enum DeviceType {
+        kRaster_DeviceType,
+        kPicture_DeviceType,
+        kGPU_DeviceType
+    };
+    /**
+     * SampleApp ports can subclass this manager class if they want to:
+     *      * filter the types of devices supported
+     *      * customize plugging of SkDevice objects into an SkCanvas
+     *      * customize publishing the results of draw to the OS window
+     *      * manage GrContext / GrRenderTarget lifetimes
+     */
+    class DeviceManager : public SkRefCnt {
+    public:
+        // called at end of SampleWindow cons
+        virtual void init(SampleWindow* win) = 0;
+
+        // called when selecting a new device type
+        // can disallow a device type by returning false.
+        virtual bool supportsDeviceType(DeviceType dType) = 0;
+
+        // called before drawing. should install correct device
+        // type on the canvas. Will skip drawing if returns false.
+        virtual bool prepareCanvas(DeviceType dType,
+                                   SkCanvas* canvas,
+                                   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
+        virtual GrContext* getGrContext() = 0;
+    };
+
+    SampleWindow(void* hwnd, int argc, char** argv, DeviceManager*);
     virtual ~SampleWindow();
 
     virtual void draw(SkCanvas* canvas);
@@ -52,9 +93,9 @@ public:
     void toggleRendering();
     void toggleSlideshow();
     void toggleFPS();
-    bool drawsToHardware() { return fCanvasType == kGPU_CanvasType; }
-    bool setGrContext(GrContext*);
-    GrContext* getGrContext();
+
+    GrContext* getGrContext() const { return fDevManager->getGrContext(); }
+
     void setZoomCenter(float x, float y);
     void changeZoomLevel(float delta);
     bool nextSample();
@@ -87,23 +128,19 @@ protected:
     virtual Click* onFindClickHandler(SkScalar x, SkScalar y);
 
 private:
+    class DefaultDeviceManager;
+
     int fCurrIndex;
 
     SkPicture* fPicture;
-    GrContext* fGrContext;
-    GrRenderTarget* fGrRenderTarget;
     SkPath fClipPath;
 
     SkTouchGesture fGesture;
     SkScalar fZoomLevel;
     SkScalar fZoomScale;
 
-    enum CanvasType {
-        kRaster_CanvasType,
-        kPicture_CanvasType,
-        kGPU_CanvasType
-    };
-    CanvasType fCanvasType;
+    DeviceType fDeviceType;
+    DeviceManager* fDevManager;
 
     bool fSaveToPdf;
     SkCanvas* fPdfCanvas;
@@ -137,8 +174,6 @@ private:
     int fScrollTestX, fScrollTestY;
     SkScalar fZoomCenterX, fZoomCenterY;
 
-    bool make3DReady();
-
     void loadView(SkView*);
     void updateTitle();
 
@@ -150,8 +185,6 @@ private:
 
     void postAnimatingEvent();
 
-    static CanvasType cycle_canvastype(CanvasType);
-
     typedef SkOSWindow INHERITED;
 };