Implement crop rect for lighting image filters.

src/effects/SkMagnifierImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkMagnifierImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 200 matching lines @@
     uint32_t x = random->nextULessThan(kMaxWidth - width);
     uint32_t y = random->nextULessThan(kMaxHeight - height);
     SkScalar inset = SkIntToScalar(random->nextULessThan(kMaxInset));
 
     SkAutoTUnref<SkMagnifierImageFilter> filter(
             new SkMagnifierImageFilter(
                 SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
                                  SkIntToScalar(width), SkIntToScalar(height)),
                 inset));
     GrEffectRef* effect;
-    filter->asNewEffect(&effect, textures[0]);
+    filter->asNewEffect(&effect, textures[0], SkIPoint::Make(0, 0));
     GrAssert(NULL != effect);
     return effect;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const {
     return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance();
 }
 
@@ skipping 25 matching lines @@
     fInset = buffer.readScalar();
 }
 
 // FIXME:  implement single-input semantics
 SkMagnifierImageFilter::SkMagnifierImageFilter(SkRect srcRect, SkScalar inset)
     : INHERITED(0), fSrcRect(srcRect), fInset(inset) {
     SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
 }
 
 #if SK_SUPPORT_GPU
-bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture) const {
+bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkIPoint&) const {
     if (effect) {
         *effect = GrMagnifierEffect::Create(texture,
                                             fSrcRect.x() / texture->width(),
                                             fSrcRect.y() / texture->height(),
                                             texture->width() / fSrcRect.width(),
                                             texture->height() / fSrcRect.height(),
                                             fInset / texture->width(),
                                             fInset / texture->height());
     }
     return true;
@@ skipping 67 matching lines @@
 
             int x_val = SkMin32(SkScalarFloorToInt(x_interp), width - 1);
             int y_val = SkMin32(SkScalarFloorToInt(y_interp), height - 1);
 
             *dptr = sptr[y_val * width + x_val];
             dptr++;
         }
     }
     return true;
 }