Add an origin flag for backend (external) textures. Some textures in WebKit have a topdown orientation, and skia needs to be notified of this, so that they are not drawn upside-down.

Review URL: https://codereview.appspot.com/7200048

git-svn-id: http://skia.googlecode.com/svn/trunk@7414 2bbb7eff-a529-9590-31e7-b0007b416f81

4 files changed, 18 insertions, 17 deletions

diff --git a/include/gpu/GrRenderTarget.h b/include/gpu/GrRenderTarget.h
index 4e77466b9a..19a37a5d8b 100644
--- a/include/gpu/GrRenderTarget.h
+++ b/include/gpu/GrRenderTarget.h
@@ -142,7 +142,7 @@ protected:
                    bool isWrapped,
                    GrTexture* texture,
                    const GrTextureDesc& desc,
-                   Origin origin)
+                   GrSurfaceOrigin origin)
         : INHERITED(gpu, isWrapped, desc, origin)
         , fStencilBuffer(NULL)
         , fTexture(texture) {
diff --git a/include/gpu/GrSurface.h b/include/gpu/GrSurface.h
index 4ef0acb82e..8ccbc9833b 100644
--- a/include/gpu/GrSurface.h
+++ b/include/gpu/GrSurface.h
@@ -33,19 +33,8 @@ public:
      */
     int height() const { return fDesc.fHeight; }
 
-    /**
-     * Some surfaces will be stored such that the upper and left edges of the content meet at the
-     * the origin (in texture coord space) and for other surfaces the lower and left edges meet at
-     * the origin. Render-targets are always consistent with the convention of the underlying
-     * backend API to make it easier to mix native backend rendering with Skia rendering. Wrapped
-     * backend surfaces always use the backend's convention as well.
-     */
-    enum Origin {
-        kTopLeft_Origin,
-        kBottomLeft_Origin,
-    };
-    Origin origin() const {
-        GrAssert(kTopLeft_Origin == fOrigin || kBottomLeft_Origin == fOrigin);
+    GrSurfaceOrigin origin() const {
+        GrAssert(kTopLeft_SurfaceOrigin == fOrigin || kBottomLeft_SurfaceOrigin == fOrigin);
         return fOrigin;
     }
 
@@ -115,7 +104,7 @@ public:
                              uint32_t pixelOpsFlags = 0) = 0;
 
 protected:
-    GrSurface(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, Origin origin)
+    GrSurface(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, GrSurfaceOrigin origin)
     : INHERITED(gpu, isWrapped)
     , fDesc(desc)
     , fOrigin(origin) {
@@ -124,7 +113,7 @@ protected:
     GrTextureDesc fDesc;
 
 private:
-    Origin fOrigin;
+    GrSurfaceOrigin fOrigin;
 
     typedef GrResource INHERITED;
 };
diff --git a/include/gpu/GrTexture.h b/include/gpu/GrTexture.h
index 657e6e5078..94d578894b 100644
--- a/include/gpu/GrTexture.h
+++ b/include/gpu/GrTexture.h
@@ -140,7 +140,7 @@ protected:
                                    // base class cons sets to NULL
                                    // subclass cons can create and set
 
-    GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, Origin origin)
+    GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, GrSurfaceOrigin origin)
     : INHERITED(gpu, isWrapped, desc, origin)
     , fRenderTarget(NULL) {
 
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index d7241b499c..055750dd11 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -425,6 +425,17 @@ enum {
     kGrColorTableSize = 256 * 4 //sizeof(GrColor)
 };
 
+/**
+ * Some textures will be stored such that the upper and left edges of the content meet at the
+ * the origin (in texture coord space) and for other textures the lower and left edges meet at
+ * the origin. Render-targets are always consistent with the convention of the underlying
+ * backend API to make it easier to mix native backend rendering with Skia rendering.
+ */
+
+enum GrSurfaceOrigin {
+    kBottomLeft_GrSurfaceOrigin,
+    kTopLeft_GrSurfaceOrigin,
+};
 
 /**
  * Describes a texture to be created.
@@ -596,6 +607,7 @@ GR_MAKE_BITFIELD_OPS(GrBackendTextureFlags)
 struct GrBackendTextureDesc {
     GrBackendTextureDesc() { memset(this, 0, sizeof(*this)); }
     GrBackendTextureFlags           fFlags;
+    GrSurfaceOrigin                 fOrigin;
     int                             fWidth;         //<! width in pixels
     int                             fHeight;        //<! height in pixels
     GrPixelConfig                   fConfig;        //<! color format