Add code path for Gr client to resolve an Gr-created MSAA render target.

Review URL: http://codereview.appspot.com/5580049/


git-svn-id: http://skia.googlecode.com/svn/trunk@3112 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 22 insertions, 0 deletions

diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index ca440a6243..3fb47750cf 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -562,6 +562,20 @@ public:
      * @param dst           the render target to copy to.
      */
     void copyTexture(GrTexture* src, GrRenderTarget* dst);
+
+    /**
+     * Resolves a render target that has MSAA. The intermediate MSAA buffer is
+     * downsampled to the associated GrTexture (accessible via
+     * GrRenderTarget::asTexture()). Any pending draws to the render target will
+     * be executed before the resolve.
+     *
+     * This is only necessary when a client wants to access the object directly
+     * using the underlying graphics API. GrContext will detect when it must
+     * perform a resolve to a GrTexture used as the source of a draw or before
+     * reading pixels back from a GrTexture or GrRenderTarget.
+     */
+    void resolveRenderTarget(GrRenderTarget* target);
+
     /**
      * Applies a 1D convolution kernel in the X direction to a rectangle of
      * pixels from a given texture.
diff --git a/include/gpu/GrRenderTarget.h b/include/gpu/GrRenderTarget.h
index 13b2160f79..909adb3e7d 100644
--- a/include/gpu/GrRenderTarget.h
+++ b/include/gpu/GrRenderTarget.h
@@ -112,6 +112,14 @@ public:
      */
     const GrIRect& getResolveRect() const { return fResolveRect; }
 
+    /**
+     * If the render target is multisampled this will perform a multisample
+     * resolve. Any pending draws to the target are first flushed. This only
+     * applies to render targets that are associated with GrTextures. After the
+     * function returns the GrTexture will contain the resolved pixels.
+     */
+    void resolve();
+
     // GrResource overrides
     virtual size_t sizeInBytes() const;