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Fix SkTwoPointConicalGradient zero-radius handling

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r == 0 is within valid gradient range, we shouldn't skip it.

BUG=skia:5023
R=caryclark@google.com,reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1756573002

Review URL: https://codereview.chromium.org/1756573002
This commit is contained in:
fmalita 2016-03-01 14:28:27 -08:00 committed by Commit bot
parent bdc6b2b168
commit 9c0b02a557
2 changed files with 26 additions and 2 deletions
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4
src/effects/gradients/SkTwoPointConicalGradient.cpp
View File

@ -122,10 +122,10 @@ SkFixed TwoPtRadialContext::nextT() {
// find_quad_roots returns the values sorted, so we start with the last
float t = roots[countRoots - 1];
float r = lerp(fRec.fRadius, fRec.fDRadius, t);
if (r <= 0) {
if (r < 0) {
t = roots[0]; // might be the same as roots[countRoots-1]
r = lerp(fRec.fRadius, fRec.fDRadius, t);
if (r <= 0) {
if (r < 0) {
return TwoPtRadial::kDontDrawT;
}
}

24
tests/GradientTest.cpp
View File

@ -6,6 +6,7 @@
*/
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkColorShader.h"
#include "SkGradientShader.h"
#include "SkShader.h"
@ -233,10 +234,33 @@ static void test_linear_fuzz(skiatest::Reporter* reporter) {
surface->getCanvas()->drawRect(r, paint);
}
// https://bugs.chromium.org/p/skia/issues/detail?id=5023
// We should still shade pixels for which the radius is exactly 0.
static void test_two_point_conical_zero_radius(skiatest::Reporter* reporter) {
SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(5, 5));
surface->getCanvas()->clear(SK_ColorRED);
const SkColor colors[] = { SK_ColorGREEN, SK_ColorBLUE };
SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(
SkPoint::Make(2.5f, 2.5f), 0,
SkPoint::Make(3.0f, 3.0f), 10,
colors, nullptr, SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode));
SkPaint p;
p.setShader(shader);
surface->getCanvas()->drawPaint(p);
// r == 0 for the center pixel.
// verify that we draw it (no red bleed)
SkPMColor centerPMColor;
surface->readPixels(SkImageInfo::MakeN32Premul(1, 1), &centerPMColor, sizeof(SkPMColor), 2, 2);
REPORTER_ASSERT(reporter, SkGetPackedR32(centerPMColor) == 0);
}
DEF_TEST(Gradient, reporter) {
TestGradientShaders(reporter);
TestConstantGradient(reporter);
test_big_grad(reporter);
test_nearly_vertical(reporter);
test_linear_fuzz(reporter);
test_two_point_conical_zero_radius(reporter);
}