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skia2/tests/BlurTest.cpp
Michael Ludwig e267464b89 Make small epsilons more rigorous for gpu gaussian blurs 
This also has several other bug fixes and refactorings within it that
I realized were possible while updating every where that had checked
sigma > 0 to be sigma > kEffectivelyZeroSigma.

The big things are that SkBlurPriv.h goes away and its functions are
just moved into SkGpuBlurUtils since they were only used by the GPU.
The implementations of those functions are also collected into
SkGpuBlurUtils.cpp.  I removed the GrMatrixConvolution::MakeGaussian,
in favor of SkGpuBlurUtils filling in the kernel itself and then calling
the regular Make. This let me consolidate two different 1D kernel
computing functions, and remove the 1D fallback code from the 2D kernel
calculation because GaussianBlur() can detect that earlier.

The new GM, BlurSigmaSmall, originally drew incorrectly on the GPU
backend because it's small but non-zero sigma would trick the sigma > 0
checks in various places so we'd do a full 2 pass X/Y blur. However,
when the sigma was too small, the kernel was just filled with 0s so the
Y pass would effectively clear everything. While I could have just fixed
that to be a [0, 1, 0] kernel, updating the blur pipeline to compare
against integer radii seems more robust.

Change-Id: I3c41e0235a27615a9056b25e627ffedd995264bd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328797
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2020-10-21 17:37:12 +00:00

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/*
* Copyright 2011 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/SkBlendMode.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkDrawLooper.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkMath.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRRect.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkBlurDrawLooper.h"
#include "include/effects/SkLayerDrawLooper.h"
#include "include/effects/SkPerlinNoiseShader.h"
#include "include/gpu/GrDirectContext.h"
#include "include/private/SkFloatBits.h"
#include "include/private/SkTPin.h"
#include "src/core/SkBlurMask.h"
#include "src/core/SkGpuBlurUtils.h"
#include "src/core/SkMask.h"
#include "src/core/SkMaskFilterBase.h"
#include "src/core/SkMathPriv.h"
#include "src/effects/SkEmbossMaskFilter.h"
#include "tests/Test.h"
#include "tools/ToolUtils.h"
#include "tools/gpu/GrContextFactory.h"
#include <math.h>
#include <string.h>
#include <initializer_list>
#include <utility>
#define WRITE_CSV 0
///////////////////////////////////////////////////////////////////////////////
#define ILLEGAL_MODE ((SkXfermode::Mode)-1)
static const int outset = 100;
static const SkColor bgColor = SK_ColorWHITE;
static const int strokeWidth = 4;
static void create(SkBitmap* bm, const SkIRect& bound) {
bm->allocN32Pixels(bound.width(), bound.height());
}
static void drawBG(SkCanvas* canvas) {
canvas->drawColor(bgColor);
}
struct BlurTest {
void (*addPath)(SkPath*);
int viewLen;
SkIRect views[9];
};
//Path Draw Procs
//Beware that paths themselves my draw differently depending on the clip.
static void draw50x50Rect(SkPath* path) {
path->addRect(0, 0, SkIntToScalar(50), SkIntToScalar(50));
}
//Tests
static BlurTest tests[] = {
{ draw50x50Rect, 3, {
//inner half of blur
{ 0, 0, 50, 50 },
//blur, but no path.
{ 50 + strokeWidth/2, 50 + strokeWidth/2, 100, 100 },
//just an edge
{ 40, strokeWidth, 60, 50 - strokeWidth },
}},
};
/** Assumes that the ref draw was completely inside ref canvas --
implies that everything outside is "bgColor".
Checks that all overlap is the same and that all non-overlap on the
ref is "bgColor".
*/
static bool compare(const SkBitmap& ref, const SkIRect& iref,
const SkBitmap& test, const SkIRect& itest)
{
const int xOff = itest.fLeft - iref.fLeft;
const int yOff = itest.fTop - iref.fTop;
for (int y = 0; y < test.height(); ++y) {
for (int x = 0; x < test.width(); ++x) {
SkColor testColor = test.getColor(x, y);
int refX = x + xOff;
int refY = y + yOff;
SkColor refColor;
if (refX >= 0 && refX < ref.width() &&
refY >= 0 && refY < ref.height())
{
refColor = ref.getColor(refX, refY);
} else {
refColor = bgColor;
}
if (refColor != testColor) {
return false;
}
}
}
return true;
}
DEF_TEST(BlurDrawing, reporter) {
SkPaint paint;
paint.setColor(SK_ColorGRAY);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(strokeWidth));
SkScalar sigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5));
for (int style = 0; style <= kLastEnum_SkBlurStyle; ++style) {
SkBlurStyle blurStyle = static_cast<SkBlurStyle>(style);
for (bool respectCTM : { false, true }) {
paint.setMaskFilter(SkMaskFilter::MakeBlur(blurStyle, sigma, respectCTM));
for (size_t test = 0; test < SK_ARRAY_COUNT(tests); ++test) {
SkPath path;
tests[test].addPath(&path);
SkPath strokedPath;
paint.getFillPath(path, &strokedPath);
SkRect refBound = strokedPath.getBounds();
SkIRect iref;
refBound.roundOut(&iref);
iref.inset(-outset, -outset);
SkBitmap refBitmap;
create(&refBitmap, iref);
SkCanvas refCanvas(refBitmap);
refCanvas.translate(SkIntToScalar(-iref.fLeft),
SkIntToScalar(-iref.fTop));
drawBG(&refCanvas);
refCanvas.drawPath(path, paint);
for (int view = 0; view < tests[test].viewLen; ++view) {
SkIRect itest = tests[test].views[view];
SkBitmap testBitmap;
create(&testBitmap, itest);
SkCanvas testCanvas(testBitmap);
testCanvas.translate(SkIntToScalar(-itest.fLeft),
SkIntToScalar(-itest.fTop));
drawBG(&testCanvas);
testCanvas.drawPath(path, paint);
REPORTER_ASSERT(reporter,
compare(refBitmap, iref, testBitmap, itest));
}
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
// Use SkBlurMask::BlurGroundTruth to blur a 'width' x 'height' solid
// white rect. Return the right half of the middle row in 'result'.
static void ground_truth_2d(int width, int height,
SkScalar sigma,
int* result, int resultCount) {
SkMask src, dst;
src.fBounds.setWH(width, height);
src.fFormat = SkMask::kA8_Format;
src.fRowBytes = src.fBounds.width();
src.fImage = SkMask::AllocImage(src.computeTotalImageSize());
memset(src.fImage, 0xff, src.computeTotalImageSize());
if (!SkBlurMask::BlurGroundTruth(sigma, &dst, src, kNormal_SkBlurStyle)) {
return;
}
int midX = dst.fBounds.x() + dst.fBounds.width()/2;
int midY = dst.fBounds.y() + dst.fBounds.height()/2;
uint8_t* bytes = dst.getAddr8(midX, midY);
int i;
for (i = 0; i < dst.fBounds.width()-(midX-dst.fBounds.fLeft); ++i) {
if (i < resultCount) {
result[i] = bytes[i];
}
}
for ( ; i < resultCount; ++i) {
result[i] = 0;
}
SkMask::FreeImage(src.fImage);
SkMask::FreeImage(dst.fImage);
}
// Implement a step function that is 255 between min and max; 0 elsewhere.
static int step(int x, SkScalar min, SkScalar max) {
if (min < x && x < max) {
return 255;
}
return 0;
}
// Implement a Gaussian function with 0 mean and std.dev. of 'sigma'.
static float gaussian(int x, SkScalar sigma) {
float k = SK_Scalar1/(sigma * sqrtf(2.0f*SK_ScalarPI));
float exponent = -(x * x) / (2 * sigma * sigma);
return k * expf(exponent);
}
// Perform a brute force convolution of a step function with a Gaussian.
// Return the right half in 'result'
static void brute_force_1d(SkScalar stepMin, SkScalar stepMax,
SkScalar gaussianSigma,
int* result, int resultCount) {
int gaussianRange = SkScalarCeilToInt(10 * gaussianSigma);
for (int i = 0; i < resultCount; ++i) {
SkScalar sum = 0.0f;
for (int j = -gaussianRange; j < gaussianRange; ++j) {
sum += gaussian(j, gaussianSigma) * step(i-j, stepMin, stepMax);
}
result[i] = SkTPin(SkClampPos(int(sum + 0.5f)), 0, 255);
}
}
static void blur_path(SkCanvas* canvas, const SkPath& path,
SkScalar gaussianSigma) {
SkScalar midX = path.getBounds().centerX();
SkScalar midY = path.getBounds().centerY();
canvas->translate(-midX, -midY);
SkPaint blurPaint;
blurPaint.setColor(SK_ColorWHITE);
blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, gaussianSigma));
canvas->drawColor(SK_ColorBLACK);
canvas->drawPath(path, blurPaint);
}
// Readback the blurred draw results from the canvas
static void readback(const SkBitmap& src, int* result, int resultCount) {
SkBitmap readback;
readback.allocN32Pixels(resultCount, 30);
SkPixmap pm;
readback.peekPixels(&pm);
src.readPixels(pm, 0, 0);
const SkPMColor* pixels = pm.addr32(0, 15);
for (int i = 0; i < resultCount; ++i) {
result[i] = SkColorGetR(pixels[i]);
}
}
// Draw a blurred version of the provided path.
// Return the right half of the middle row in 'result'.
static void cpu_blur_path(const SkPath& path, SkScalar gaussianSigma,
int* result, int resultCount) {
SkBitmap bitmap;
bitmap.allocN32Pixels(resultCount, 30);
SkCanvas canvas(bitmap);
blur_path(&canvas, path, gaussianSigma);
readback(bitmap, result, resultCount);
}
#if WRITE_CSV
static void write_as_csv(const char* label, SkScalar scale, int* data, int count) {
SkDebugf("%s_%.2f,", label, scale);
for (int i = 0; i < count-1; ++i) {
SkDebugf("%d,", data[i]);
}
SkDebugf("%d\n", data[count-1]);
}
#endif
static bool match(int* first, int* second, int count, int tol) {
int delta;
for (int i = 0; i < count; ++i) {
delta = first[i] - second[i];
if (delta > tol || delta < -tol) {
return false;
}
}
return true;
}
// Test out the normal blur style with a wide range of sigmas
DEF_TEST(BlurSigmaRange, reporter) {
static const int kSize = 100;
// The geometry is offset a smidge to trigger:
// https://code.google.com/p/chromium/issues/detail?id=282418
SkPath rectPath;
rectPath.addRect(0.3f, 0.3f, 100.3f, 100.3f);
SkPoint polyPts[] = {
{ 0.3f, 0.3f },
{ 100.3f, 0.3f },
{ 100.3f, 100.3f },
{ 0.3f, 100.3f },
{ 2.3f, 50.3f } // a little divet to throw off the rect special case
};
SkPath polyPath;
polyPath.addPoly(polyPts, SK_ARRAY_COUNT(polyPts), true);
int rectSpecialCaseResult[kSize];
int generalCaseResult[kSize];
int groundTruthResult[kSize];
int bruteForce1DResult[kSize];
SkScalar sigma = 10.0f;
for (int i = 0; i < 4; ++i, sigma /= 10) {
cpu_blur_path(rectPath, sigma, rectSpecialCaseResult, kSize);
cpu_blur_path(polyPath, sigma, generalCaseResult, kSize);
ground_truth_2d(100, 100, sigma, groundTruthResult, kSize);
brute_force_1d(-50.0f, 50.0f, sigma, bruteForce1DResult, kSize);
REPORTER_ASSERT(reporter, match(rectSpecialCaseResult, bruteForce1DResult, kSize, 5));
REPORTER_ASSERT(reporter, match(generalCaseResult, bruteForce1DResult, kSize, 15));
REPORTER_ASSERT(reporter, match(groundTruthResult, bruteForce1DResult, kSize, 1));
#if WRITE_CSV
write_as_csv("RectSpecialCase", sigma, rectSpecialCaseResult, kSize);
write_as_csv("GeneralCase", sigma, generalCaseResult, kSize);
write_as_csv("GPU", sigma, gpuResult, kSize);
write_as_csv("GroundTruth2D", sigma, groundTruthResult, kSize);
write_as_csv("BruteForce1D", sigma, bruteForce1DResult, kSize);
#endif
}
}
///////////////////////////////////////////////////////////////////////////////////////////
static void test_blurDrawLooper(skiatest::Reporter* reporter, SkScalar sigma, SkBlurStyle style) {
if (kNormal_SkBlurStyle != style) {
return; // blurdrawlooper only supports normal
}
const SkColor color = 0xFF335577;
const SkScalar dx = 10;
const SkScalar dy = -5;
sk_sp<SkDrawLooper> lp(SkBlurDrawLooper::Make(color, sigma, dx, dy));
const bool expectSuccess = sigma > 0;
if (nullptr == lp) {
REPORTER_ASSERT(reporter, sigma <= 0);
} else {
SkDrawLooper::BlurShadowRec rec;
bool success = lp->asABlurShadow(&rec);
REPORTER_ASSERT(reporter, success == expectSuccess);
if (success) {
REPORTER_ASSERT(reporter, rec.fSigma == sigma);
REPORTER_ASSERT(reporter, rec.fOffset.x() == dx);
REPORTER_ASSERT(reporter, rec.fOffset.y() == dy);
REPORTER_ASSERT(reporter, rec.fColor == color);
REPORTER_ASSERT(reporter, rec.fStyle == style);
}
}
}
static void test_looper(skiatest::Reporter* reporter, sk_sp<SkDrawLooper> lp, SkScalar sigma,
SkBlurStyle style, bool expectSuccess) {
SkDrawLooper::BlurShadowRec rec;
bool success = lp->asABlurShadow(&rec);
REPORTER_ASSERT(reporter, success == expectSuccess);
if (success != expectSuccess) {
lp->asABlurShadow(&rec);
}
if (success) {
REPORTER_ASSERT(reporter, rec.fSigma == sigma);
REPORTER_ASSERT(reporter, rec.fStyle == style);
}
}
static void make_noop_layer(SkLayerDrawLooper::Builder* builder) {
SkLayerDrawLooper::LayerInfo info;
info.fPaintBits = 0;
info.fColorMode = SkBlendMode::kDst;
builder->addLayer(info);
}
static void make_blur_layer(SkLayerDrawLooper::Builder* builder, sk_sp<SkMaskFilter> mf) {
SkLayerDrawLooper::LayerInfo info;
info.fPaintBits = SkLayerDrawLooper::kMaskFilter_Bit;
info.fColorMode = SkBlendMode::kSrc;
SkPaint* paint = builder->addLayer(info);
paint->setMaskFilter(std::move(mf));
}
static void test_layerDrawLooper(skiatest::Reporter* reporter, sk_sp<SkMaskFilter> mf,
SkScalar sigma, SkBlurStyle style, bool expectSuccess) {
SkLayerDrawLooper::LayerInfo info;
SkLayerDrawLooper::Builder builder;
// 1 layer is too few
make_noop_layer(&builder);
test_looper(reporter, builder.detach(), sigma, style, false);
// 2 layers is good, but need blur
make_noop_layer(&builder);
make_noop_layer(&builder);
test_looper(reporter, builder.detach(), sigma, style, false);
// 2 layers is just right
make_noop_layer(&builder);
make_blur_layer(&builder, mf);
test_looper(reporter, builder.detach(), sigma, style, expectSuccess);
// 3 layers is too many
make_noop_layer(&builder);
make_blur_layer(&builder, mf);
make_noop_layer(&builder);
test_looper(reporter, builder.detach(), sigma, style, false);
}
DEF_TEST(BlurAsABlur, reporter) {
const SkBlurStyle styles[] = {
kNormal_SkBlurStyle, kSolid_SkBlurStyle, kOuter_SkBlurStyle, kInner_SkBlurStyle
};
const SkScalar sigmas[] = {
// values <= 0 should not success for a blur
-1, 0, 0.5f, 2
};
// Test asABlur for SkBlurMaskFilter
//
for (size_t i = 0; i < SK_ARRAY_COUNT(styles); ++i) {
const SkBlurStyle style = styles[i];
for (size_t j = 0; j < SK_ARRAY_COUNT(sigmas); ++j) {
const SkScalar sigma = sigmas[j];
for (bool respectCTM : { false, true }) {
sk_sp<SkMaskFilter> mf(SkMaskFilter::MakeBlur(style, sigma, respectCTM));
if (nullptr == mf.get()) {
REPORTER_ASSERT(reporter, sigma <= 0);
} else {
REPORTER_ASSERT(reporter, sigma > 0);
SkMaskFilterBase::BlurRec rec;
bool success = as_MFB(mf)->asABlur(&rec);
if (respectCTM) {
REPORTER_ASSERT(reporter, success);
REPORTER_ASSERT(reporter, rec.fSigma == sigma);
REPORTER_ASSERT(reporter, rec.fStyle == style);
} else {
REPORTER_ASSERT(reporter, !success);
}
test_layerDrawLooper(reporter, std::move(mf), sigma, style, success);
}
test_blurDrawLooper(reporter, sigma, style);
}
}
}
// Test asABlur for SkEmbossMaskFilter -- should never succeed
//
{
SkEmbossMaskFilter::Light light = {
{ 1, 1, 1 }, 0, 127, 127
};
for (size_t j = 0; j < SK_ARRAY_COUNT(sigmas); ++j) {
const SkScalar sigma = sigmas[j];
auto mf(SkEmbossMaskFilter::Make(sigma, light));
if (mf) {
SkMaskFilterBase::BlurRec rec;
bool success = as_MFB(mf)->asABlur(&rec);
REPORTER_ASSERT(reporter, !success);
}
}
}
}
// This exercises the problem discovered in crbug.com/570232. The return value from
// SkBlurMask::BoxBlur wasn't being checked in SkBlurMaskFilter.cpp::GrRRectBlurEffect::Create
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SmallBoxBlurBug, reporter, ctxInfo) {
SkImageInfo info = SkImageInfo::MakeN32Premul(128, 128);
auto surface(SkSurface::MakeRenderTarget(ctxInfo.directContext(), SkBudgeted::kNo, info));
SkCanvas* canvas = surface->getCanvas();
SkRect r = SkRect::MakeXYWH(10, 10, 100, 100);
SkRRect rr = SkRRect::MakeRectXY(r, 10, 10);
SkPaint p;
p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 0.01f));
canvas->drawRRect(rr, p);
}
DEF_TEST(BlurredRRectNinePatchComputation, reporter) {
const SkRect r = SkRect::MakeXYWH(10, 10, 100, 100);
static const SkScalar kBlurRad = 3.0f;
bool ninePatchable;
SkRRect rrectToDraw;
SkISize size;
SkScalar rectXs[SkGpuBlurUtils::kBlurRRectMaxDivisions],
rectYs[SkGpuBlurUtils::kBlurRRectMaxDivisions];
SkScalar texXs[SkGpuBlurUtils::kBlurRRectMaxDivisions],
texYs[SkGpuBlurUtils::kBlurRRectMaxDivisions];
// not nine-patchable
{
SkVector radii[4] = { { 100, 100 }, { 0, 0 }, { 100, 100 }, { 0, 0 } };
SkRRect rr;
rr.setRectRadii(r, radii);
ninePatchable = SkGpuBlurUtils::ComputeBlurredRRectParams(rr, rr, kBlurRad, kBlurRad,
&rrectToDraw, &size,
rectXs, rectYs, texXs, texYs);
REPORTER_ASSERT(reporter, !ninePatchable);
}
// simple circular
{
static const SkScalar kCornerRad = 10.0f;
SkRRect rr;
rr.setRectXY(r, kCornerRad, kCornerRad);
ninePatchable = SkGpuBlurUtils::ComputeBlurredRRectParams(rr, rr, kBlurRad, kBlurRad,
&rrectToDraw, &size,
rectXs, rectYs, texXs, texYs);
static const SkScalar kAns = 12.0f * kBlurRad + 2.0f * kCornerRad + 1.0f;
REPORTER_ASSERT(reporter, ninePatchable);
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(SkIntToScalar(size.fWidth), kAns));
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(SkIntToScalar(size.fHeight), kAns));
}
// simple elliptical
{
static const SkScalar kXCornerRad = 2.0f;
static const SkScalar kYCornerRad = 10.0f;
SkRRect rr;
rr.setRectXY(r, kXCornerRad, kYCornerRad);
ninePatchable = SkGpuBlurUtils::ComputeBlurredRRectParams(rr, rr, kBlurRad, kBlurRad,
&rrectToDraw, &size,
rectXs, rectYs, texXs, texYs);
static const SkScalar kXAns = 12.0f * kBlurRad + 2.0f * kXCornerRad + 1.0f;
static const SkScalar kYAns = 12.0f * kBlurRad + 2.0f * kYCornerRad + 1.0f;
REPORTER_ASSERT(reporter, ninePatchable);
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(SkIntToScalar(size.fWidth), kXAns));
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(SkIntToScalar(size.fHeight), kYAns));
}
}
// https://crbugs.com/787712
DEF_TEST(EmbossPerlinCrash, reporter) {
SkPaint p;
static constexpr SkEmbossMaskFilter::Light light = {
{ 1, 1, 1 }, 0, 127, 127
};
p.setMaskFilter(SkEmbossMaskFilter::Make(1, light));
p.setShader(SkPerlinNoiseShader::MakeFractalNoise(1.0f, 1.0f, 2, 0.0f));
sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(100, 100);
surface->getCanvas()->drawPaint(p);
}
///////////////////////////////////////////////////////////////////////////////////////////
DEF_TEST(BlurZeroSigma, reporter) {
auto surf = SkSurface::MakeRasterN32Premul(20, 20);
SkPaint paint;
paint.setAntiAlias(true);
const SkIRect ir = { 5, 5, 15, 15 };
const SkRect r = SkRect::Make(ir);
const SkScalar sigmas[] = { 0, SkBits2Float(1) };
// if sigma is zero (or nearly so), we need to draw correctly (unblurred) and not crash
// or assert.
for (auto sigma : sigmas) {
paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, sigma));
surf->getCanvas()->drawRect(r, paint);
ToolUtils::PixelIter iter(surf.get());
SkIPoint loc;
while (const SkPMColor* p = (const SkPMColor*)iter.next(&loc)) {
if (ir.contains(loc.fX, loc.fY)) {
// inside the rect we draw (opaque black)
REPORTER_ASSERT(reporter, *p == SkPackARGB32(0xFF, 0, 0, 0));
} else {
// outside the rect we didn't draw at all, no blurred edges
REPORTER_ASSERT(reporter, *p == 0);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(BlurMaskBiggerThanDest, reporter, ctxInfo) {
auto context = ctxInfo.directContext();
SkImageInfo ii = SkImageInfo::Make(32, 32, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
sk_sp<SkSurface> dst(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));
if (!dst) {
ERRORF(reporter, "Could not create surface for test.");
return;
}
SkPaint p;
p.setColor(SK_ColorRED);
p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 3));
SkCanvas* canvas = dst->getCanvas();
canvas->clear(SK_ColorBLACK);
canvas->drawCircle(SkPoint::Make(16, 16), 8, p);
SkBitmap readback;
SkAssertResult(readback.tryAllocPixels(ii));
canvas->readPixels(readback, 0, 0);
REPORTER_ASSERT(reporter, SkColorGetR(readback.getColor(15, 15)) > 128);
REPORTER_ASSERT(reporter, SkColorGetG(readback.getColor(15, 15)) == 0);
REPORTER_ASSERT(reporter, SkColorGetB(readback.getColor(15, 15)) == 0);
REPORTER_ASSERT(reporter, readback.getColor(31, 31) == SK_ColorBLACK);
}
DEF_TEST(zero_blur, reporter) {
SkBitmap alpha, bitmap;
SkPaint paint;
paint.setMaskFilter(SkMaskFilter::MakeBlur(kOuter_SkBlurStyle, 3));
SkIPoint offset;
bitmap.extractAlpha(&alpha, &paint, nullptr, &offset);
}
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