Implement support for a Context parameter in image filters

tests/ImageFilterTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBicubicImageFilter.h"
 #include "SkBitmap.h"
 #include "SkBitmapDevice.h"
@@ skipping 25 matching lines @@
 static const int kBitmapSize = 4;
 
 namespace {
 
 class MatrixTestImageFilter : public SkImageFilter {
 public:
     MatrixTestImageFilter(skiatest::Reporter* reporter, const SkMatrix& expectedMatrix)
       : SkImageFilter(0), fReporter(reporter), fExpectedMatrix(expectedMatrix) {
     }
 
-    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix& ctm,
+    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context& ctx,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
-        REPORTER_ASSERT(fReporter, ctm == fExpectedMatrix);
+        REPORTER_ASSERT(fReporter, ctx.ctm() == fExpectedMatrix);
         return true;
     }
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(MatrixTestImageFilter)
 
 protected:
     explicit MatrixTestImageFilter(SkReadBuffer& buffer) : SkImageFilter(0) {
         fReporter = static_cast<skiatest::Reporter*>(buffer.readFunctionPtr());
         buffer.readMatrix(&fExpectedMatrix);
     }
@@ skipping 124 matching lines @@
         {
             // This tests for scale bringing width to 0
             SkSize scale = SkSize::Make(-0.001f, SK_Scalar1);
             SkAutoTUnref<SkImageFilter> bmSrc(SkBitmapSource::Create(bitmap));
             SkAutoTUnref<SkBicubicImageFilter> bicubic(
                 SkBicubicImageFilter::CreateMitchell(scale, bmSrc));
             SkBitmapDevice device(bitmap);
             SkDeviceImageFilterProxy proxy(&device);
             SkIPoint loc = SkIPoint::Make(0, 0);
             // An empty input should early return and return false
+            SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeEmpty());
             REPORTER_ASSERT(reporter,
-                            !bicubic->filterImage(&proxy, bitmap, SkMatrix::I(), &result, &loc));
+                            !bicubic->filterImage(&proxy, bitmap, ctx, &result, &loc));
         }
     }
 }
 
 static void test_crop_rects(SkBaseDevice* device, skiatest::Reporter* reporter) {
     // Check that all filters offset to their absolute crop rect,
     // unaffected by the input crop rect.
     // Tests pass by not asserting.
     SkBitmap bitmap;
     bitmap.allocN32Pixels(100, 100);
@@ skipping 33 matching lines @@
         SkTileImageFilter::Create(inputCropRect.rect(), cropRect.rect(), input.get()),
         SkXfermodeImageFilter::Create(SkXfermode::Create(SkXfermode::kSrcOver_Mode), input.get(), input.get(), &cropRect),
     };
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
         SkImageFilter* filter = filters[i];
         SkBitmap result;
         SkIPoint offset;
         SkString str;
         str.printf("filter %d", static_cast<int>(i));
-        REPORTER_ASSERT_MESSAGE(reporter, filter->filterImage(&proxy, bitmap, SkMatrix::I(), &result, &offset), str.c_str());
+        SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeEmpty());
+        REPORTER_ASSERT_MESSAGE(reporter, filter->filterImage(&proxy, bitmap, ctx, &result, &offset), str.c_str());
         REPORTER_ASSERT_MESSAGE(reporter, offset.fX == 20 && offset.fY == 30, str.c_str());
     }
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
         SkSafeUnref(filters[i]);
     }
 }
 
 DEF_TEST(ImageFilterCropRect, reporter) {
     SkBitmap temp;
@@ skipping 36 matching lines @@
 
 #if SK_SUPPORT_GPU
 DEF_GPUTEST(ImageFilterCropRectGPU, reporter, factory) {
     GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(context,
                                                          SkImageInfo::MakeN32Premul(100, 100),
                                                          0));
     test_crop_rects(device, reporter);
 }
 #endif