574 lines
19 KiB
C++
574 lines
19 KiB
C++
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkBlurMask.h"
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#include "SkBlurMaskFilter.h"
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#include "SkBlurDrawLooper.h"
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#include "SkLayerDrawLooper.h"
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#include "SkEmbossMaskFilter.h"
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#include "SkCanvas.h"
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#include "SkMath.h"
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#include "SkPaint.h"
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#include "Test.h"
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#if SK_SUPPORT_GPU
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#include "GrContextFactory.h"
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#include "SkGpuDevice.h"
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#endif
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#define WRITE_CSV 0
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///////////////////////////////////////////////////////////////////////////////
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#define ILLEGAL_MODE ((SkXfermode::Mode)-1)
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static const int outset = 100;
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static const SkColor bgColor = SK_ColorWHITE;
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static const int strokeWidth = 4;
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static void create(SkBitmap* bm, const SkIRect& bound) {
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bm->allocN32Pixels(bound.width(), bound.height());
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}
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static void drawBG(SkCanvas* canvas) {
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canvas->drawColor(bgColor);
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}
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struct BlurTest {
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void (*addPath)(SkPath*);
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int viewLen;
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SkIRect views[9];
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};
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//Path Draw Procs
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//Beware that paths themselves my draw differently depending on the clip.
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static void draw50x50Rect(SkPath* path) {
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path->addRect(0, 0, SkIntToScalar(50), SkIntToScalar(50));
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}
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//Tests
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static BlurTest tests[] = {
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{ draw50x50Rect, 3, {
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//inner half of blur
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{ 0, 0, 50, 50 },
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//blur, but no path.
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{ 50 + strokeWidth/2, 50 + strokeWidth/2, 100, 100 },
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//just an edge
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{ 40, strokeWidth, 60, 50 - strokeWidth },
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}},
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};
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/** Assumes that the ref draw was completely inside ref canvas --
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implies that everything outside is "bgColor".
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Checks that all overlap is the same and that all non-overlap on the
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ref is "bgColor".
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*/
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static bool compare(const SkBitmap& ref, const SkIRect& iref,
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const SkBitmap& test, const SkIRect& itest)
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{
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const int xOff = itest.fLeft - iref.fLeft;
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const int yOff = itest.fTop - iref.fTop;
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SkAutoLockPixels alpRef(ref);
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SkAutoLockPixels alpTest(test);
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for (int y = 0; y < test.height(); ++y) {
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for (int x = 0; x < test.width(); ++x) {
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SkColor testColor = test.getColor(x, y);
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int refX = x + xOff;
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int refY = y + yOff;
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SkColor refColor;
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if (refX >= 0 && refX < ref.width() &&
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refY >= 0 && refY < ref.height())
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{
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refColor = ref.getColor(refX, refY);
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} else {
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refColor = bgColor;
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}
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if (refColor != testColor) {
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return false;
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}
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}
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}
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return true;
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}
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static void test_blur_drawing(skiatest::Reporter* reporter) {
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SkPaint paint;
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paint.setColor(SK_ColorGRAY);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(strokeWidth));
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SkScalar sigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5));
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for (int style = 0; style <= kLastEnum_SkBlurStyle; ++style) {
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SkBlurStyle blurStyle = static_cast<SkBlurStyle>(style);
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const uint32_t flagPermutations = SkBlurMaskFilter::kAll_BlurFlag;
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for (uint32_t flags = 0; flags < flagPermutations; ++flags) {
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SkMaskFilter* filter;
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filter = SkBlurMaskFilter::Create(blurStyle, sigma, flags);
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paint.setMaskFilter(filter);
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filter->unref();
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for (size_t test = 0; test < SK_ARRAY_COUNT(tests); ++test) {
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SkPath path;
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tests[test].addPath(&path);
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SkPath strokedPath;
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paint.getFillPath(path, &strokedPath);
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SkRect refBound = strokedPath.getBounds();
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SkIRect iref;
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refBound.roundOut(&iref);
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iref.inset(-outset, -outset);
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SkBitmap refBitmap;
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create(&refBitmap, iref);
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SkCanvas refCanvas(refBitmap);
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refCanvas.translate(SkIntToScalar(-iref.fLeft),
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SkIntToScalar(-iref.fTop));
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drawBG(&refCanvas);
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refCanvas.drawPath(path, paint);
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for (int view = 0; view < tests[test].viewLen; ++view) {
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SkIRect itest = tests[test].views[view];
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SkBitmap testBitmap;
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create(&testBitmap, itest);
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SkCanvas testCanvas(testBitmap);
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testCanvas.translate(SkIntToScalar(-itest.fLeft),
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SkIntToScalar(-itest.fTop));
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drawBG(&testCanvas);
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testCanvas.drawPath(path, paint);
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REPORTER_ASSERT(reporter,
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compare(refBitmap, iref, testBitmap, itest));
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}
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}
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// Use SkBlurMask::BlurGroundTruth to blur a 'width' x 'height' solid
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// white rect. Return the right half of the middle row in 'result'.
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static void ground_truth_2d(int width, int height,
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SkScalar sigma,
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int* result, int resultCount) {
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SkMask src, dst;
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src.fBounds.set(0, 0, width, height);
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src.fFormat = SkMask::kA8_Format;
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src.fRowBytes = src.fBounds.width();
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src.fImage = SkMask::AllocImage(src.computeTotalImageSize());
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memset(src.fImage, 0xff, src.computeTotalImageSize());
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dst.fImage = NULL;
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SkBlurMask::BlurGroundTruth(sigma, &dst, src, kNormal_SkBlurStyle);
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int midX = dst.fBounds.centerX();
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int midY = dst.fBounds.centerY();
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uint8_t* bytes = dst.getAddr8(midX, midY);
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int i;
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for (i = 0; i < dst.fBounds.width()-(midX-dst.fBounds.fLeft); ++i) {
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if (i < resultCount) {
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result[i] = bytes[i];
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}
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}
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for ( ; i < resultCount; ++i) {
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result[i] = 0;
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}
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SkMask::FreeImage(src.fImage);
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SkMask::FreeImage(dst.fImage);
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}
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// Implement a step function that is 255 between min and max; 0 elsewhere.
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static int step(int x, SkScalar min, SkScalar max) {
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if (min < x && x < max) {
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return 255;
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}
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return 0;
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}
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// Implement a Gaussian function with 0 mean and std.dev. of 'sigma'.
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static float gaussian(int x, SkScalar sigma) {
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float k = SK_Scalar1/(sigma * sqrtf(2.0f*SK_ScalarPI));
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float exponent = -(x * x) / (2 * sigma * sigma);
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return k * expf(exponent);
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}
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// Perform a brute force convolution of a step function with a Gaussian.
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// Return the right half in 'result'
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static void brute_force_1d(SkScalar stepMin, SkScalar stepMax,
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SkScalar gaussianSigma,
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int* result, int resultCount) {
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int gaussianRange = SkScalarCeilToInt(10 * gaussianSigma);
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for (int i = 0; i < resultCount; ++i) {
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SkScalar sum = 0.0f;
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for (int j = -gaussianRange; j < gaussianRange; ++j) {
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sum += gaussian(j, gaussianSigma) * step(i-j, stepMin, stepMax);
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}
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result[i] = SkClampMax(SkClampPos(int(sum + 0.5f)), 255);
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}
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}
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static void blur_path(SkCanvas* canvas, const SkPath& path,
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SkScalar gaussianSigma) {
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SkScalar midX = path.getBounds().centerX();
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SkScalar midY = path.getBounds().centerY();
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canvas->translate(-midX, -midY);
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SkPaint blurPaint;
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blurPaint.setColor(SK_ColorWHITE);
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SkMaskFilter* filter = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
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gaussianSigma,
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SkBlurMaskFilter::kHighQuality_BlurFlag);
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blurPaint.setMaskFilter(filter)->unref();
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canvas->drawColor(SK_ColorBLACK);
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canvas->drawPath(path, blurPaint);
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}
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// Readback the blurred draw results from the canvas
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static void readback(SkCanvas* canvas, int* result, int resultCount) {
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SkBitmap readback;
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readback.allocN32Pixels(resultCount, 30);
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SkIRect readBackRect = { 0, 0, resultCount, 30 };
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canvas->readPixels(readBackRect, &readback);
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readback.lockPixels();
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SkPMColor* pixels = (SkPMColor*) readback.getAddr32(0, 15);
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for (int i = 0; i < resultCount; ++i) {
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result[i] = SkColorGetR(pixels[i]);
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}
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}
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// Draw a blurred version of the provided path.
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// Return the right half of the middle row in 'result'.
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static void cpu_blur_path(const SkPath& path, SkScalar gaussianSigma,
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int* result, int resultCount) {
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SkBitmap bitmap;
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bitmap.allocN32Pixels(resultCount, 30);
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SkCanvas canvas(bitmap);
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blur_path(&canvas, path, gaussianSigma);
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readback(&canvas, result, resultCount);
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}
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#if SK_SUPPORT_GPU
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#if 0
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// temporary disable; see below for explanation
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static bool gpu_blur_path(GrContextFactory* factory, const SkPath& path,
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SkScalar gaussianSigma,
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int* result, int resultCount) {
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GrContext* grContext = factory->get(GrContextFactory::kNative_GLContextType);
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if (NULL == grContext) {
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return false;
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}
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GrSurfaceDesc desc;
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desc.fConfig = kSkia8888_GrPixelConfig;
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desc.fFlags = kRenderTarget_GrSurfaceFlag;
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desc.fWidth = resultCount;
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desc.fHeight = 30;
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desc.fSampleCnt = 0;
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SkAutoTUnref<GrTexture> texture(grContext->createTexture(desc, false, NULL, 0));
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SkAutoTUnref<SkGpuDevice> device(SkNEW_ARGS(SkGpuDevice, (grContext, texture.get())));
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SkCanvas canvas(device.get());
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blur_path(&canvas, path, gaussianSigma);
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readback(&canvas, result, resultCount);
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return true;
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}
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#endif
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#endif
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#if WRITE_CSV
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static void write_as_csv(const char* label, SkScalar scale, int* data, int count) {
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SkDebugf("%s_%.2f,", label, scale);
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for (int i = 0; i < count-1; ++i) {
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SkDebugf("%d,", data[i]);
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}
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SkDebugf("%d\n", data[count-1]);
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}
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#endif
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static bool match(int* first, int* second, int count, int tol) {
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int delta;
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for (int i = 0; i < count; ++i) {
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delta = first[i] - second[i];
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if (delta > tol || delta < -tol) {
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return false;
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}
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}
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return true;
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}
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// Test out the normal blur style with a wide range of sigmas
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static void test_sigma_range(skiatest::Reporter* reporter, GrContextFactory* factory) {
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static const int kSize = 100;
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// The geometry is offset a smidge to trigger:
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// https://code.google.com/p/chromium/issues/detail?id=282418
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SkPath rectPath;
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rectPath.addRect(0.3f, 0.3f, 100.3f, 100.3f);
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SkPoint polyPts[] = {
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{ 0.3f, 0.3f },
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{ 100.3f, 0.3f },
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{ 100.3f, 100.3f },
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{ 0.3f, 100.3f },
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{ 2.3f, 50.3f } // a little divet to throw off the rect special case
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};
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SkPath polyPath;
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polyPath.addPoly(polyPts, SK_ARRAY_COUNT(polyPts), true);
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int rectSpecialCaseResult[kSize];
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int generalCaseResult[kSize];
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int groundTruthResult[kSize];
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int bruteForce1DResult[kSize];
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SkScalar sigma = 10.0f;
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for (int i = 0; i < 4; ++i, sigma /= 10) {
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cpu_blur_path(rectPath, sigma, rectSpecialCaseResult, kSize);
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cpu_blur_path(polyPath, sigma, generalCaseResult, kSize);
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ground_truth_2d(100, 100, sigma, groundTruthResult, kSize);
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brute_force_1d(-50.0f, 50.0f, sigma, bruteForce1DResult, kSize);
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REPORTER_ASSERT(reporter, match(rectSpecialCaseResult, bruteForce1DResult, kSize, 5));
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REPORTER_ASSERT(reporter, match(generalCaseResult, bruteForce1DResult, kSize, 15));
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#if SK_SUPPORT_GPU
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#if 0
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int gpuResult[kSize];
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bool haveGPUResult = gpu_blur_path(factory, rectPath, sigma, gpuResult, kSize);
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// Disabling this test for now -- I don't think it's a legit comparison.
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// Will continue to investigate this.
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if (haveGPUResult) {
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// 1 works everywhere but: Ubuntu13 & Nexus4
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REPORTER_ASSERT(reporter, match(gpuResult, bruteForce1DResult, kSize, 10));
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}
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#endif
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#endif
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REPORTER_ASSERT(reporter, match(groundTruthResult, bruteForce1DResult, kSize, 1));
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#if WRITE_CSV
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write_as_csv("RectSpecialCase", sigma, rectSpecialCaseResult, kSize);
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write_as_csv("GeneralCase", sigma, generalCaseResult, kSize);
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#if SK_SUPPORT_GPU
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write_as_csv("GPU", sigma, gpuResult, kSize);
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#endif
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write_as_csv("GroundTruth2D", sigma, groundTruthResult, kSize);
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write_as_csv("BruteForce1D", sigma, bruteForce1DResult, kSize);
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#endif
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////
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static SkBlurQuality blurMaskFilterFlags_as_quality(uint32_t blurMaskFilterFlags) {
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return (blurMaskFilterFlags & SkBlurMaskFilter::kHighQuality_BlurFlag) ?
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kHigh_SkBlurQuality : kLow_SkBlurQuality;
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}
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static uint32_t blurMaskFilterFlags_to_blurDrawLooperFlags(uint32_t bmf) {
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const struct {
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uint32_t fBlurMaskFilterFlag;
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uint32_t fBlurDrawLooperFlag;
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} pairs[] = {
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{ SkBlurMaskFilter::kIgnoreTransform_BlurFlag, SkBlurDrawLooper::kIgnoreTransform_BlurFlag },
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{ SkBlurMaskFilter::kHighQuality_BlurFlag, SkBlurDrawLooper::kHighQuality_BlurFlag },
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};
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uint32_t bdl = 0;
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for (size_t i = 0; i < SK_ARRAY_COUNT(pairs); ++i) {
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if (bmf & pairs[i].fBlurMaskFilterFlag) {
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bdl |= pairs[i].fBlurDrawLooperFlag;
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}
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}
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return bdl;
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}
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static void test_blurDrawLooper(skiatest::Reporter* reporter, SkScalar sigma,
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SkBlurStyle style, uint32_t blurMaskFilterFlags) {
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if (kNormal_SkBlurStyle != style) {
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return; // blurdrawlooper only supports normal
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}
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const SkColor color = 0xFF335577;
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const SkScalar dx = 10;
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const SkScalar dy = -5;
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const SkBlurQuality quality = blurMaskFilterFlags_as_quality(blurMaskFilterFlags);
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uint32_t flags = blurMaskFilterFlags_to_blurDrawLooperFlags(blurMaskFilterFlags);
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SkAutoTUnref<SkDrawLooper> lp(SkBlurDrawLooper::Create(color, sigma, dx, dy, flags));
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const bool expectSuccess = sigma > 0 &&
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0 == (flags & SkBlurDrawLooper::kIgnoreTransform_BlurFlag);
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if (NULL == lp.get()) {
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REPORTER_ASSERT(reporter, sigma <= 0);
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} else {
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SkDrawLooper::BlurShadowRec rec;
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bool success = lp->asABlurShadow(&rec);
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REPORTER_ASSERT(reporter, success == expectSuccess);
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if (success) {
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REPORTER_ASSERT(reporter, rec.fSigma == sigma);
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REPORTER_ASSERT(reporter, rec.fOffset.x() == dx);
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REPORTER_ASSERT(reporter, rec.fOffset.y() == dy);
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REPORTER_ASSERT(reporter, rec.fColor == color);
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REPORTER_ASSERT(reporter, rec.fStyle == style);
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REPORTER_ASSERT(reporter, rec.fQuality == quality);
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}
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}
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}
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static void test_delete_looper(skiatest::Reporter* reporter, SkDrawLooper* lp, SkScalar sigma,
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SkBlurStyle style, SkBlurQuality quality, bool expectSuccess) {
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SkDrawLooper::BlurShadowRec rec;
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bool success = lp->asABlurShadow(&rec);
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REPORTER_ASSERT(reporter, success == expectSuccess);
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if (success != expectSuccess) {
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lp->asABlurShadow(&rec);
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}
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if (success) {
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REPORTER_ASSERT(reporter, rec.fSigma == sigma);
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REPORTER_ASSERT(reporter, rec.fStyle == style);
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REPORTER_ASSERT(reporter, rec.fQuality == quality);
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}
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lp->unref();
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}
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static void make_noop_layer(SkLayerDrawLooper::Builder* builder) {
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SkLayerDrawLooper::LayerInfo info;
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info.fPaintBits = 0;
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info.fColorMode = SkXfermode::kDst_Mode;
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builder->addLayer(info);
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}
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static void make_blur_layer(SkLayerDrawLooper::Builder* builder, SkMaskFilter* mf) {
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SkLayerDrawLooper::LayerInfo info;
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info.fPaintBits = SkLayerDrawLooper::kMaskFilter_Bit;
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info.fColorMode = SkXfermode::kSrc_Mode;
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SkPaint* paint = builder->addLayer(info);
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paint->setMaskFilter(mf);
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}
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static void test_layerDrawLooper(skiatest::Reporter* reporter, SkMaskFilter* mf, SkScalar sigma,
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SkBlurStyle style, SkBlurQuality quality, bool expectSuccess) {
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SkLayerDrawLooper::LayerInfo info;
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SkLayerDrawLooper::Builder builder;
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// 1 layer is too few
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make_noop_layer(&builder);
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test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);
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// 2 layers is good, but need blur
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make_noop_layer(&builder);
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make_noop_layer(&builder);
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test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);
|
|
|
|
// 2 layers is just right
|
|
make_noop_layer(&builder);
|
|
make_blur_layer(&builder, mf);
|
|
test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, expectSuccess);
|
|
|
|
// 3 layers is too many
|
|
make_noop_layer(&builder);
|
|
make_blur_layer(&builder, mf);
|
|
make_noop_layer(&builder);
|
|
test_delete_looper(reporter, builder.detachLooper(), sigma, style, quality, false);
|
|
}
|
|
|
|
static void test_asABlur(skiatest::Reporter* 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 = (SkBlurStyle)styles[i];
|
|
for (size_t j = 0; j < SK_ARRAY_COUNT(sigmas); ++j) {
|
|
const SkScalar sigma = sigmas[j];
|
|
for (int flags = 0; flags <= SkBlurMaskFilter::kAll_BlurFlag; ++flags) {
|
|
const SkBlurQuality quality = blurMaskFilterFlags_as_quality(flags);
|
|
|
|
SkAutoTUnref<SkMaskFilter> mf(SkBlurMaskFilter::Create(style, sigma, flags));
|
|
if (NULL == mf.get()) {
|
|
REPORTER_ASSERT(reporter, sigma <= 0);
|
|
} else {
|
|
REPORTER_ASSERT(reporter, sigma > 0);
|
|
SkMaskFilter::BlurRec rec;
|
|
bool success = mf->asABlur(&rec);
|
|
if (flags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag) {
|
|
REPORTER_ASSERT(reporter, !success);
|
|
} else {
|
|
REPORTER_ASSERT(reporter, success);
|
|
REPORTER_ASSERT(reporter, rec.fSigma == sigma);
|
|
REPORTER_ASSERT(reporter, rec.fStyle == style);
|
|
REPORTER_ASSERT(reporter, rec.fQuality == quality);
|
|
}
|
|
test_layerDrawLooper(reporter, mf, sigma, style, quality, success);
|
|
}
|
|
test_blurDrawLooper(reporter, sigma, style, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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];
|
|
SkAutoTUnref<SkMaskFilter> mf(SkEmbossMaskFilter::Create(sigma, light));
|
|
if (mf.get()) {
|
|
SkMaskFilter::BlurRec rec;
|
|
bool success = mf->asABlur(&rec);
|
|
REPORTER_ASSERT(reporter, !success);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
DEF_GPUTEST(Blur, reporter, factory) {
|
|
test_blur_drawing(reporter);
|
|
test_sigma_range(reporter, factory);
|
|
test_asABlur(reporter);
|
|
}
|