Allow GrEffects with multiple textures.

It will work as long as the total number of textures sis less than GrDrawState::kNumStages. That will be fixed in a follow up CL.
Review URL: https://codereview.appspot.com/7040052

git-svn-id: http://skia.googlecode.com/svn/trunk@7023 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 10 insertions, 1 deletions

diff --git a/include/gpu/GrEffect.h b/include/gpu/GrEffect.h
index 0adc00be00..5a151190a2 100644
--- a/include/gpu/GrEffect.h
+++ b/include/gpu/GrEffect.h
@@ -11,11 +11,11 @@
 #include "GrRefCnt.h"
 #include "GrNoncopyable.h"
 #include "GrEffectUnitTest.h"
+#include "GrTexture.h"
 #include "GrTextureAccess.h"
 
 class GrBackendEffectFactory;
 class GrContext;
-class GrTexture;
 class SkString;
 
 /** Provides custom vertex shader, fragment shader, uniform data for a
@@ -86,6 +86,15 @@ public:
     /** Shortcut for textureAccess(index).texture(); */
     GrTexture* texture(int index) const { return this->textureAccess(index).getTexture(); }
 
+    /** Useful for effects that want to insert a texture matrix that is implied by the texture
+        dimensions */
+    static inline SkMatrix MakeDivByTextureWHMatrix(const GrTexture* texture) {
+        GrAssert(NULL != texture);
+        SkMatrix mat;
+        mat.setIDiv(texture->width(), texture->height());
+        return mat;
+    }
+
     void* operator new(size_t size);
     void operator delete(void* target);