Adding linear interpolation to rgb->yuv conversion

src/gpu/effects/GrYUVtoRGBEffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrYUVtoRGBEffect.h"
 
 #include "GrCoordTransform.h"
@@ skipping 15 matching lines @@
         w[1] = SkIntToScalar(sizes[1].fWidth)  / SkIntToScalar(uTexture->width());
         h[1] = SkIntToScalar(sizes[1].fHeight) / SkIntToScalar(uTexture->height());
         w[2] = SkIntToScalar(sizes[2].fWidth)  / SkIntToScalar(vTexture->width());
         h[2] = SkIntToScalar(sizes[2].fHeight) / SkIntToScalar(vTexture->height());
         SkMatrix yuvMatrix[3];
         yuvMatrix[0] = GrCoordTransform::MakeDivByTextureWHMatrix(yTexture);
         yuvMatrix[1] = yuvMatrix[0];
         yuvMatrix[1].preScale(w[1] / w[0], h[1] / h[0]);
         yuvMatrix[2] = yuvMatrix[0];
         yuvMatrix[2].preScale(w[2] / w[0], h[2] / h[0]);
-        return SkNEW_ARGS(YUVtoRGBEffect, (yTexture, uTexture, vTexture, yuvMatrix, colorSpace));
+        GrTextureParams::FilterMode uvFilterMode =
+            ((sizes[1].fWidth  != sizes[0].fWidth) ||
+             (sizes[1].fHeight != sizes[0].fHeight) ||
+             (sizes[2].fWidth  != sizes[0].fWidth) ||
+             (sizes[2].fHeight != sizes[0].fHeight)) ?
+            GrTextureParams::kBilerp_FilterMode :
+            GrTextureParams::kNone_FilterMode;
+        return SkNEW_ARGS(YUVtoRGBEffect, (yTexture, uTexture, vTexture, yuvMatrix,
+                                           uvFilterMode, colorSpace));
     }
 
     const char* name() const SK_OVERRIDE { return "YUV to RGB"; }
 
     SkYUVColorSpace getColorSpace() const {
         return fColorSpace;
     }
 
     class GLProcessor : public GrGLFragmentProcessor {
     public:
@@ skipping 49 matching lines @@
                                    GrProcessorKeyBuilder* b) const SK_OVERRIDE {
         GLProcessor::GenKey(*this, caps, b);
     }
 
     GrGLFragmentProcessor* createGLInstance() const SK_OVERRIDE {
         return SkNEW_ARGS(GLProcessor, (*this));
     }
 
 private:
     YUVtoRGBEffect(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
-                   SkMatrix yuvMatrix[3], SkYUVColorSpace colorSpace)
+                   SkMatrix yuvMatrix[3], GrTextureParams::FilterMode uvFilterMode,
+                   SkYUVColorSpace colorSpace)
     : fYTransform(kLocal_GrCoordSet, yuvMatrix[0], yTexture, GrTextureParams::kNone_FilterMode)
     , fYAccess(yTexture)
-    , fUTransform(kLocal_GrCoordSet, yuvMatrix[1], uTexture, GrTextureParams::kNone_FilterMode)
-    , fUAccess(uTexture)
-    , fVTransform(kLocal_GrCoordSet, yuvMatrix[2], vTexture, GrTextureParams::kNone_FilterMode)
-    , fVAccess(vTexture)
+    , fUTransform(kLocal_GrCoordSet, yuvMatrix[1], uTexture, uvFilterMode)
+    , fUAccess(uTexture, uvFilterMode)
+    , fVTransform(kLocal_GrCoordSet, yuvMatrix[2], vTexture, uvFilterMode)
+    , fVAccess(vTexture, uvFilterMode)
     , fColorSpace(colorSpace) {
         this->initClassID<YUVtoRGBEffect>();
         this->addCoordTransform(&fYTransform);
         this->addTextureAccess(&fYAccess);
         this->addCoordTransform(&fUTransform);
         this->addTextureAccess(&fUAccess);
         this->addCoordTransform(&fVTransform);
         this->addTextureAccess(&fVAccess);
     }
 
@@ skipping 32 matching lines @@
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrFragmentProcessor*
 GrYUVtoRGBEffect::Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
                          SkISize sizes[3], SkYUVColorSpace colorSpace) {
     SkASSERT(yTexture && uTexture && vTexture && sizes);
     return YUVtoRGBEffect::Create(yTexture, uTexture, vTexture, sizes, colorSpace);
 }