Adding a new unit test that demonstrates that dithering affects constant gradients
Related bug: crbug.com/169602
Review URL: https://codereview.appspot.com/7220063
git-svn-id: http://skia.googlecode.com/svn/trunk@7465 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/GradientTest.cpp b/tests/GradientTest.cpp
index 007caa3..e60c9ed 100644
--- a/tests/GradientTest.cpp
+++ b/tests/GradientTest.cpp
@@ -6,6 +6,7 @@
* found in the LICENSE file.
*/
#include "Test.h"
+#include "SkDevice.h"
#include "SkTemplates.h"
#include "SkShader.h"
#include "SkColorShader.h"
@@ -126,9 +127,39 @@
REPORTER_ASSERT(reporter, !memcmp(info.fRadius, rec.fRadius, 2 * sizeof(SkScalar)));
}
+// Ensure that repeated color gradients behave like drawing a single color
+static void TestConstantGradient(skiatest::Reporter* reporter) {
+ const SkPoint pts[] = {
+ { 0, 0 },
+ { SkIntToScalar(10), 0 }
+ };
+ SkColor colors[] = { SK_ColorBLUE, SK_ColorBLUE };
+ const SkScalar pos[] = { 0, SK_Scalar1 };
+ SkAutoTUnref<SkShader> s(SkGradientShader::CreateLinear(pts,
+ colors,
+ pos,
+ 2,
+ SkShader::kClamp_TileMode));
+ SkBitmap outBitmap;
+ outBitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 1);
+ outBitmap.allocPixels();
+ SkPaint paint;
+ paint.setShader(s.get());
+ SkDevice device(outBitmap);
+ SkCanvas canvas(&device);
+ canvas.drawPaint(paint);
+ SkAutoLockPixels alp(outBitmap);
+ for (int i = 0; i < 10; i++) {
+ // The following is commented out because it currently fails
+ // Related bug: https://code.google.com/p/skia/issues/detail?id=1098
+
+ // REPORTER_ASSERT(reporter, SK_ColorBLUE == outBitmap.getColor(i, 0));
+ }
+}
+
typedef void (*GradProc)(skiatest::Reporter* reporter, const GradRec&);
-static void TestGradients(skiatest::Reporter* reporter) {
+static void TestGradientShaders(skiatest::Reporter* reporter) {
static const SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
static const SkPoint gPts[] = {
@@ -160,5 +191,9 @@
}
}
+static void TestGradients(skiatest::Reporter* reporter) {
+ TestGradientShaders(reporter);
+ TestConstantGradient(reporter);
+}
#include "TestClassDef.h"
DEFINE_TESTCLASS("Gradients", TestGradientsClass, TestGradients)