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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkBitmap.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkRefCnt.h"
- #include "tests/Test.h"
- #include <cmath>
- #include <cstdlib>
- static inline void assert_color(skiatest::Reporter* reporter,
- SkColor expected, SkColor actual, int tolerance) {
- REPORTER_ASSERT(reporter, abs((int)(SkColorGetA(expected) - SkColorGetA(actual))) <= tolerance);
- REPORTER_ASSERT(reporter, abs((int)(SkColorGetR(expected) - SkColorGetR(actual))) <= tolerance);
- REPORTER_ASSERT(reporter, abs((int)(SkColorGetG(expected) - SkColorGetG(actual))) <= tolerance);
- REPORTER_ASSERT(reporter, abs((int)(SkColorGetB(expected) - SkColorGetB(actual))) <= tolerance);
- }
- static inline void assert_color(skiatest::Reporter* reporter, SkColor expected, SkColor actual) {
- const int TOLERANCE = 1;
- assert_color(reporter, expected, actual, TOLERANCE);
- }
- /**
- * This test case is a mirror of the Android CTS tests for MatrixColorFilter
- * found in the android.graphics.ColorMatrixColorFilterTest class.
- */
- static inline void test_colorMatrixCTS(skiatest::Reporter* reporter) {
- SkBitmap bitmap;
- bitmap.allocN32Pixels(1,1);
- SkCanvas canvas(bitmap);
- SkPaint paint;
- float blueToCyan[20] = {
- 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
- 0.0f, 1.0f, 1.0f, 0.0f, 0.0f,
- 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
- 0.0f, 0.0f, 0.0f, 1.0f, 0.0f };
- paint.setColorFilter(SkColorFilters::Matrix(blueToCyan));
- paint.setColor(SK_ColorBLUE);
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
- paint.setColor(SK_ColorGREEN);
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorGREEN, bitmap.getColor(0, 0));
- paint.setColor(SK_ColorRED);
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorRED, bitmap.getColor(0, 0));
- // color components are clipped, not scaled
- paint.setColor(SK_ColorMAGENTA);
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorWHITE, bitmap.getColor(0, 0));
- float transparentRedAddBlue[20] = {
- 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
- 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
- 0.0f, 0.0f, 1.0f, 0.0f, 64.0f/255,
- -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
- };
- paint.setColorFilter(SkColorFilters::Matrix(transparentRedAddBlue));
- bitmap.eraseColor(SK_ColorTRANSPARENT);
- paint.setColor(SK_ColorRED);
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SkColorSetARGB(128, 255, 0, 64), bitmap.getColor(0, 0), 2);
- paint.setColor(SK_ColorCYAN);
- canvas.drawPoint(0, 0, paint);
- // blue gets clipped
- assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
- // change array to filter out green
- REPORTER_ASSERT(reporter, 1.0f == transparentRedAddBlue[6]);
- transparentRedAddBlue[6] = 0.0f;
- // check that changing the array has no effect
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));
- // create a new filter with the changed matrix
- paint.setColorFilter(SkColorFilters::Matrix(transparentRedAddBlue));
- canvas.drawPoint(0, 0, paint);
- assert_color(reporter, SK_ColorBLUE, bitmap.getColor(0, 0));
- }
- DEF_TEST(ColorMatrix, reporter) {
- test_colorMatrixCTS(reporter);
- }
- DEF_TEST(ColorMatrix_clamp_while_unpremul, r) {
- // This matrix does green += 255/255 and alpha += 32/255. We want to test
- // that if we pass it opaque alpha and small red and blue values, red and
- // blue stay unchanged, not pumped up by that ~1.12 intermediate alpha.
- float m[] = {
- 1, 0, 0, 0, 0,
- 0, 1, 0, 0, 1,
- 0, 0, 1, 0, 0,
- 0, 0, 0, 1, 32.0f/255,
- };
- auto filter = SkColorFilters::Matrix(m);
- SkColor filtered = filter->filterColor(0xff0a0b0c);
- REPORTER_ASSERT(r, SkColorGetA(filtered) == 0xff);
- REPORTER_ASSERT(r, SkColorGetR(filtered) == 0x0a);
- REPORTER_ASSERT(r, SkColorGetG(filtered) == 0xff);
- REPORTER_ASSERT(r, SkColorGetB(filtered) == 0x0c);
- }
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