void onOnceBeforeDraw() override {
fCheckerboard.reset(SkImage::NewFromBitmap(
sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8)));
fGradientCircle.reset(make_gradient_circle(64, 64));
}
virtual void onDraw(SkCanvas* canvas) {
SkAutoTUnref<SkColorFilter> cf(
SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
SkImageFilter::CropRect crop_rect(
SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)),
SkImageFilter::CropRect::kHasAll_CropEdge);
SkBitmap gradient_circle, checkerboard;
make_gradient_circle(64, 64, &gradient_circle);
make_checkerboard(&checkerboard);
SkAutoTUnref<SkImageFilter> gradient_circle_source(
SkBitmapSource::Create(gradient_circle));
SkAutoTUnref<SkImageFilter> noop_cropped(
SkOffsetImageFilter::Create(0, 0, NULL, &crop_rect));
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> cf_alpha_trans(SkColorMatrixFilter::Create(matrix));
SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
SkScalar MARGIN = SkIntToScalar(12);
SkIRect bounds;
r.roundOut(&bounds);
SkPaint paint;
canvas->translate(MARGIN, MARGIN);
for (int outset = -15; outset <= 20; outset += 5) {
canvas->save();
SkRect rect = crop_rect.rect();
rect.outset(SkIntToScalar(outset),
SkIntToScalar(outset));
SkImageFilter::CropRect big_rect(rect, SkImageFilter::CropRect::kHasAll_CropEdge);
draw(canvas, checkerboard, rect, SkColorFilterImageFilter::Create(
cf_alpha_trans, noop_cropped.get(), &big_rect));
draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
8.0f, 8.0f, noop_cropped.get(), &big_rect));
draw(canvas, checkerboard, rect, SkDilateImageFilter::Create(
2, 2, noop_cropped.get(), &big_rect));
draw(canvas, checkerboard, rect, SkErodeImageFilter::Create(
2, 2, noop_cropped.get(), &big_rect));
draw(canvas, checkerboard, rect, SkDropShadowImageFilter::Create(
SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(3), SkIntToScalar(3),
SK_ColorBLUE, noop_cropped.get(), &big_rect));
draw(canvas, checkerboard, rect, SkDisplacementMapEffect::Create(
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkIntToScalar(12),
gradient_circle_source.get(),
noop_cropped.get(),
&big_rect));
draw(canvas, checkerboard, rect, SkOffsetImageFilter::Create(
SkIntToScalar(-8), SkIntToScalar(16), noop_cropped.get(), &big_rect));
canvas->restore();
canvas->translate(0, SkIntToScalar(80));
}
}
