Make SkGpuDevice know its alpha type

src/gpu/SkGpuDevice.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGpuDevice_DEFINED
 #define SkGpuDevice_DEFINED
@@ skipping 12 matching lines @@
 
 class GrAccelData;
 struct GrCachedLayer;
 
 /**
  *  Subclass of SkBaseDevice, which directs all drawing to the GrGpu owned by the
  *  canvas.
  */
 class SK_API SkGpuDevice : public SkBaseDevice {
 public:
-    enum Flags {
-        kNeedClear_Flag = 1 << 0,  //!< Surface requires an initial clear
+    enum InitContents {
+        kClear_InitContents,
+        kUninit_InitContents
     };
 
     /**
      * Creates an SkGpuDevice from a GrRenderTarget.
      */
-    static SkGpuDevice* Create(GrRenderTarget* target, const SkSurfaceProps*, unsigned flags = 0);
+    static SkGpuDevice* Create(GrRenderTarget* target, const SkSurfaceProps*, InitContents);
 
     /**
      * Creates an SkGpuDevice from a GrRenderTarget whose texture width/height is
      * different than its actual width/height (e.g., approx-match scratch texture).
      */
     static SkGpuDevice* Create(GrRenderTarget* target, int width, int height,
-                               const SkSurfaceProps*, unsigned flags = 0);
+                               const SkSurfaceProps*, InitContents);
 
     /**
      * New device that will create an offscreen renderTarget based on the ImageInfo and
      * sampleCount. The Budgeted param controls whether the device's backing store counts against
      * the resource cache budget. On failure, returns NULL.
      */
     static SkGpuDevice* Create(GrContext*, SkSurface::Budgeted, const SkImageInfo&,
-                               int sampleCount, const SkSurfaceProps*, unsigned flags = 0);
+                               int sampleCount, const SkSurfaceProps*, InitContents);
 
     virtual ~SkGpuDevice();
 
     SkGpuDevice* cloneDevice(const SkSurfaceProps& props) {
         SkBaseDevice* dev = this->onCreateDevice(CreateInfo(this->imageInfo(), kPossible_TileUsage,
                                                             props.pixelGeometry()),
                                                  NULL);
         return static_cast<SkGpuDevice*>(dev);
     }
 
@@ skipping 80 matching lines @@
     GrContext*                      fContext;
     GrSkDrawProcs*                  fDrawProcs;
     SkAutoTUnref<const SkClipStack> fClipStack;
     SkIPoint                        fClipOrigin;
     GrClip                          fClip;
     SkAutoTUnref<GrDrawContext>     fDrawContext;
     GrRenderTarget*                 fRenderTarget;
     // remove when our clients don't rely on accessBitmap()
     SkBitmap                        fLegacyBitmap;
     bool                            fNeedClear;
+    bool                            fOpaque;
+
+    enum Flags {
+        kNeedClear_Flag = 1 << 0,  //!< Surface requires an initial clear
+        kIsOpaque_Flag  = 1 << 1,  //!< Hint from client that rendering to this device will be
+                                   //   opaque even if the config supports alpha.
+    };
+    static bool CheckAlphaTypeAndGetFlags(const SkImageInfo* info, InitContents init,
+                                          unsigned* flags);
 
     SkGpuDevice(GrRenderTarget*, int width, int height, const SkSurfaceProps*, unsigned flags);
 
     SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
 
     SkSurface* newSurface(const SkImageInfo&, const SkSurfaceProps&) override;
 
     SkImageFilter::Cache* getImageFilterCache() override;
 
     bool forceConservativeRasterClip() const override { return true; }
@@ skipping 46 matching lines @@
 
     static GrRenderTarget* CreateRenderTarget(GrContext*, SkSurface::Budgeted, const SkImageInfo&,
                                               int sampleCount);
 
     friend class GrAtlasTextContext;
     friend class SkSurface_Gpu;      // for access to surfaceProps
     typedef SkBaseDevice INHERITED;
 };
 
 #endif