void onDraw(SkCanvas* canvas) override {
SkAutoTUnref<SkColorFilter> cf(
SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
SkImageFilter::CropRect cropRect(
SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)),
SkImageFilter::CropRect::kHasAll_CropEdge);
sk_sp<SkImage> gradientCircle(MakeGradientCircle(64, 64));
SkBitmap checkerboard;
MakeCheckerboard(&checkerboard);
SkAutoTUnref<SkImageFilter> gradientCircleSource(
SkImageSource::Create(gradientCircle.get()));
SkAutoTUnref<SkImageFilter> noopCropped(
SkOffsetImageFilter::Create(0, 0, nullptr, &cropRect));
SkScalar sk255 = SkIntToScalar(255);
SkScalar matrix[20] = { 1, 0, 0, 0, 0,
0, 1, 0, 0, sk255,
0, 0, 1, 0, 0,
0, 0, 0, 0, sk255 };
SkAutoTUnref<SkColorFilter> cfAlphaTrans(SkColorMatrixFilter::Create(matrix));
SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
SkScalar MARGIN = SkIntToScalar(12);
SkPoint3 pointLocation = SkPoint3::Make(0, 0, SkIntToScalar(10));
SkScalar kd = SkIntToScalar(2);
SkScalar surfaceScale = SkIntToScalar(1);
SkIRect bounds;
r.roundOut(&bounds);
SkPaint paint;
canvas->translate(MARGIN, MARGIN);
for (int outset = -15; outset <= 20; outset += 5) {
canvas->save();
SkRect rect = cropRect.rect();
rect.outset(SkIntToScalar(outset),
SkIntToScalar(outset));
SkImageFilter::CropRect bigRect(rect, SkImageFilter::CropRect::kHasAll_CropEdge);
Draw(canvas, checkerboard, rect, SkColorFilterImageFilter::Create(
cfAlphaTrans, noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
0.3f, 0.3f, noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
8.0f, 8.0f, noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkDilateImageFilter::Create(
2, 2, noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkErodeImageFilter::Create(
2, 2, noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkDropShadowImageFilter::Create(
SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(3), SkIntToScalar(3),
SK_ColorBLUE, SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect, SkDisplacementMapEffect::Create(
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkIntToScalar(12),
gradientCircleSource.get(),
noopCropped.get(),
&bigRect));
Draw(canvas, checkerboard, rect, SkOffsetImageFilter::Create(
SkIntToScalar(-8), SkIntToScalar(16), noopCropped.get(), &bigRect));
Draw(canvas, checkerboard, rect,
SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, SK_ColorWHITE,
surfaceScale, kd, noopCropped.get(), &bigRect));
canvas->restore();
canvas->translate(0, SkIntToScalar(80));
}
}
void onDraw(SkCanvas* canvas) override {
SkImageFilter::CropRect cropRect(
SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)),
SkImageFilter::CropRect::kHasAll_CropEdge);
sk_sp<SkImage> gradientCircle(MakeGradientCircle(64, 64));
SkBitmap checkerboard;
MakeCheckerboard(&checkerboard);
sk_sp<SkImageFilter> gradientCircleSource(SkImageSource::Make(std::move(gradientCircle)));
sk_sp<SkImageFilter> noopCropped(SkOffsetImageFilter::Make(0, 0, nullptr, &cropRect));
// This color matrix saturates the green component but only partly increases the opacity.
// For the opaque checkerboard, the opacity boost doesn't matter but it does impact the
// area outside the checkerboard.
SkScalar matrix[20] = { 1, 0, 0, 0, 0,
0, 1, 0, 0, 255,
0, 0, 1, 0, 0,
0, 0, 0, 1, 32 };
sk_sp<SkColorFilter> cfAlphaTrans(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
SkScalar MARGIN = SkIntToScalar(12);
SkPoint3 pointLocation = SkPoint3::Make(0, 0, SkIntToScalar(10));
SkScalar kd = SkIntToScalar(2);
SkScalar surfaceScale = SkIntToScalar(1);
SkIRect bounds;
r.roundOut(&bounds);
SkPaint paint;
canvas->translate(MARGIN, MARGIN);
for (int outset = -15; outset <= 20; outset += 5) {
canvas->save();
SkRect rect = cropRect.rect();
rect.outset(SkIntToScalar(outset),
SkIntToScalar(outset));
SkImageFilter::CropRect bigRect(rect, SkImageFilter::CropRect::kHasAll_CropEdge);
Draw(canvas, checkerboard, rect, SkColorFilterImageFilter::Make(cfAlphaTrans,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect, SkBlurImageFilter::Make(0.3f, 0.3f,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect, SkBlurImageFilter::Make(8.0f, 8.0f,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect, SkDilateImageFilter::Make(2, 2,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect, SkErodeImageFilter::Make(2, 2,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect,
SkDropShadowImageFilter::Make(
SkIntToScalar(10),
SkIntToScalar(10),
SkIntToScalar(3),
SkIntToScalar(3),
SK_ColorBLUE,
SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect,
SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkIntToScalar(12),
gradientCircleSource,
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect,
SkOffsetImageFilter::Make(SkIntToScalar(-8), SkIntToScalar(16),
noopCropped,
&bigRect));
Draw(canvas, checkerboard, rect,
SkLightingImageFilter::MakePointLitDiffuse(pointLocation,
SK_ColorWHITE,
surfaceScale,
kd,
noopCropped,
&bigRect));
canvas->restore();
canvas->translate(0, SkIntToScalar(80));
}
}