Make the orientation of a texture accessible from and known by GrSurface.
R=robertphillips@google.com
Review URL: https://codereview.appspot.com/6801044
git-svn-id: http://skia.googlecode.com/svn/branches/gpu_dev@6148 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrSurface.h b/include/gpu/GrSurface.h
index aa237ae..d7aa267 100644
--- a/include/gpu/GrSurface.h
+++ b/include/gpu/GrSurface.h
@@ -34,6 +34,22 @@
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);
+ return fOrigin;
+ }
+
+ /**
* Retrieves the pixel config specified when the surface was created.
* For render targets this can be kUnknown_GrPixelConfig
* if client asked us to render to a target that has a pixel
@@ -66,7 +82,7 @@
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
- * @param rowBytes number of bytes bewtween consecutive rows. Zero means rows are tightly
+ * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
* packed.
* @param pixelOpsFlags See the GrContext::PixelOpsFlags enum.
*
@@ -88,7 +104,7 @@
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read the rectangle from.
- * @param rowBytes number of bytes bewtween consecutive rows. Zero means rows are tightly
+ * @param rowBytes number of bytes between consecutive rows. Zero means rows are tightly
* packed.
* @param pixelOpsFlags See the GrContext::PixelOpsFlags enum.
*/
@@ -99,14 +115,17 @@
uint32_t pixelOpsFlags = 0) = 0;
protected:
- GrTextureDesc fDesc;
-
- GrSurface(GrGpu* gpu, const GrTextureDesc& desc)
+ GrSurface(GrGpu* gpu, const GrTextureDesc& desc, Origin origin)
: INHERITED(gpu)
- , fDesc(desc) {
+ , fDesc(desc)
+ , fOrigin(origin) {
}
+ GrTextureDesc fDesc;
+
private:
+ Origin fOrigin;
+
typedef GrResource INHERITED;
};