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Adding a new unit test that demonstrates that dithering affects constant gradients

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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
This commit is contained in:
junov@chromium.org 2013-01-30 15:52:06 +00:00
parent e40591d548
commit e94b5e40c5
1 changed files with 36 additions and 1 deletions
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37
tests/GradientTest.cpp
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@ -6,6 +6,7 @@
* found in the LICENSE file. * found in the LICENSE file.
*/ */
#include "Test.h" #include "Test.h"
#include "SkDevice.h"
#include "SkTemplates.h" #include "SkTemplates.h"
#include "SkShader.h" #include "SkShader.h"
#include "SkColorShader.h" #include "SkColorShader.h"
@ -126,9 +127,39 @@ static void conical_gradproc(skiatest::Reporter* reporter, const GradRec& rec) {
REPORTER_ASSERT(reporter, !memcmp(info.fRadius, rec.fRadius, 2 * sizeof(SkScalar))); 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&); 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 SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 }; static const SkScalar gPos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
static const SkPoint gPts[] = { static const SkPoint gPts[] = {
@ -160,5 +191,9 @@ static void TestGradients(skiatest::Reporter* reporter) {
} }
} }
static void TestGradients(skiatest::Reporter* reporter) {
TestGradientShaders(reporter);
TestConstantGradient(reporter);
}
#include "TestClassDef.h" #include "TestClassDef.h"
DEFINE_TESTCLASS("Gradients", TestGradientsClass, TestGradients) DEFINE_TESTCLASS("Gradients", TestGradientsClass, TestGradients)