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      1 
      2 /*
      3  * Copyright 2013 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "Test.h"
     10 #include "SkColorMatrixFilter.h"
     11 #include "SkColorFilterImageFilter.h"
     12 #include "SkRect.h"
     13 
     14 class ImageFilterTest {
     15 public:
     16 
     17     static SkImageFilter* make_scale(float amount, SkImageFilter* input = NULL) {
     18         SkScalar s = SkFloatToScalar(amount);
     19         SkScalar matrix[20] = { s, 0, 0, 0, 0,
     20                                 0, s, 0, 0, 0,
     21                                 0, 0, s, 0, 0,
     22                                 0, 0, 0, s, 0 };
     23         SkAutoTUnref<SkColorFilter> filter(new SkColorMatrixFilter(matrix));
     24         return SkColorFilterImageFilter::Create(filter, input);
     25     }
     26 
     27     static SkImageFilter* make_grayscale(SkImageFilter* input = NULL, const SkIRect* cropRect = NULL) {
     28         SkScalar matrix[20];
     29         memset(matrix, 0, 20 * sizeof(SkScalar));
     30         matrix[0] = matrix[5] = matrix[10] = SkFloatToScalar(0.2126f);
     31         matrix[1] = matrix[6] = matrix[11] = SkFloatToScalar(0.7152f);
     32         matrix[2] = matrix[7] = matrix[12] = SkFloatToScalar(0.0722f);
     33         matrix[18] = SkFloatToScalar(1.0f);
     34         SkAutoTUnref<SkColorFilter> filter(new SkColorMatrixFilter(matrix));
     35         return SkColorFilterImageFilter::Create(filter, input, cropRect);
     36     }
     37 
     38     static SkImageFilter* make_mode_blue(SkImageFilter* input = NULL) {
     39         SkAutoTUnref<SkColorFilter> filter(
     40             SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
     41         return SkColorFilterImageFilter::Create(filter, input);
     42     }
     43 
     44     static void Test(skiatest::Reporter* reporter) {
     45         {
     46             // Check that two non-clipping color matrices concatenate into a single filter.
     47             SkAutoTUnref<SkImageFilter> halfBrightness(make_scale(0.5f));
     48             SkAutoTUnref<SkImageFilter> quarterBrightness(make_scale(0.5f, halfBrightness));
     49             REPORTER_ASSERT(reporter, NULL == quarterBrightness->getInput(0));
     50         }
     51 
     52         {
     53             // Check that a clipping color matrix followed by a grayscale does not concatenate into a single filter.
     54             SkAutoTUnref<SkImageFilter> doubleBrightness(make_scale(2.0f));
     55             SkAutoTUnref<SkImageFilter> halfBrightness(make_scale(0.5f, doubleBrightness));
     56             REPORTER_ASSERT(reporter, NULL != halfBrightness->getInput(0));
     57         }
     58 
     59         {
     60             // Check that a color filter image filter without a crop rect can be
     61             // expressed as a color filter.
     62             SkAutoTUnref<SkImageFilter> gray(make_grayscale());
     63             REPORTER_ASSERT(reporter, true == gray->asColorFilter(NULL));
     64         }
     65 
     66         {
     67             // Check that a color filter image filter with a crop rect cannot
     68             // be expressed as a color filter.
     69             SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
     70             SkAutoTUnref<SkImageFilter> grayWithCrop(make_grayscale(NULL, &cropRect));
     71             REPORTER_ASSERT(reporter, false == grayWithCrop->asColorFilter(NULL));
     72         }
     73     }
     74 };
     75 
     76 
     77 #include "TestClassDef.h"
     78 DEFINE_TESTCLASS("ImageFilterTest", ImageFilterTestClass, ImageFilterTest::Test)
     79