Add ColorMatrix filter tests from Android CTS.
BUG=skia:3848
Review URL: https://codereview.chromium.org/1134753008
diff --git a/tests/ColorMatrixTest.cpp b/tests/ColorMatrixTest.cpp
new file mode 100644
index 0000000..1eea4f5
--- /dev/null
+++ b/tests/ColorMatrixTest.cpp
@@ -0,0 +1,101 @@
+/*
+ * 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 "Test.h"
+
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkColorMatrixFilter.h"
+#include "SkPaint.h"
+
+#include <stdlib.h>
+
+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;
+
+ SkScalar 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(SkColorMatrixFilter::Create(blueToCyan))->unref();
+
+ 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));
+
+ SkScalar 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,
+ -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
+ };
+ paint.setColorFilter(SkColorMatrixFilter::Create(transparentRedAddBlue))->unref();
+ 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(SkColorMatrixFilter::Create(transparentRedAddBlue))->unref();
+ canvas.drawPoint(0, 0, paint);
+ assert_color(reporter, SK_ColorBLUE, bitmap.getColor(0, 0));
+}
+
+DEF_TEST(ColorMatrix, reporter) {
+ test_colorMatrixCTS(reporter);
+}