Fix clipped lighting image filters.

src/effects/SkLightingImageFilter.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 "SkLightingImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 1199 matching lines @@
 
     SkAutoLockPixels alp(src);
     if (!src.getPixels()) {
         return false;
     }
 
     if (!dst->tryAllocPixels(src.info().makeWH(bounds.width(), bounds.height()))) {
         return false;
     }
 
-    SkAutoTUnref<SkImageFilterLight> transformedLight(light()->transform(ctx.ctm()));
+    SkMatrix matrix(ctx.ctm());
+    matrix.postTranslate(SkIntToScalar(-srcOffset.x()), SkIntToScalar(-srcOffset.y()));
+    SkAutoTUnref<SkImageFilterLight> transformedLight(light()->transform(matrix));
 
     DiffuseLightingType lightingType(fKD);
     offset->fX = bounds.left();
     offset->fY = bounds.top();
     bounds.offset(-srcOffset);
     switch (transformedLight->type()) {
         case SkImageFilterLight::kDistant_LightType:
             lightBitmap<DiffuseLightingType, SkDistantLight>(lightingType,
                                                              transformedLight,
                                                              src,
@@ skipping 124 matching lines @@
         return false;
     }
 
     if (!dst->tryAllocPixels(src.info().makeWH(bounds.width(), bounds.height()))) {
         return false;
     }
 
     SpecularLightingType lightingType(fKS, fShininess);
     offset->fX = bounds.left();
     offset->fY = bounds.top();
+    SkMatrix matrix(ctx.ctm());
+    matrix.postTranslate(SkIntToScalar(-srcOffset.x()), SkIntToScalar(-srcOffset.y()));
+    SkAutoTUnref<SkImageFilterLight> transformedLight(light()->transform(matrix));
     bounds.offset(-srcOffset);
-    SkAutoTUnref<SkImageFilterLight> transformedLight(light()->transform(ctx.ctm()));
     switch (transformedLight->type()) {
         case SkImageFilterLight::kDistant_LightType:
             lightBitmap<SpecularLightingType, SkDistantLight>(lightingType,
                                                               transformedLight,
                                                               src,
                                                               dst,
                                                               surfaceScale(),
                                                               bounds);
             break;
         case SkImageFilterLight::kPoint_LightType:
@@ skipping 658 matching lines @@
 
     fsBuilder->codeAppendf("%s(%s)", fLightColorFunc.c_str(), surfaceToLight);
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDiffuseLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpecularLightingImageFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END