void onDraw(SkCanvas* canvas) override {
auto cf = SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkXfermode::kSrc_Mode);
sk_sp<SkImageFilter> filters[] = {
SkColorFilterImageFilter::Make(std::move(cf), nullptr),
SkBlurImageFilter::Make(2.0f, 2.0f, nullptr),
SkDropShadowImageFilter::Make(
10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
nullptr),
};
SkIRect clipBounds[] {
{ -20, -20, 100, 100 },
{ 0, 0, 75, 75 },
{ 20, 20, 100, 100 },
{ -20, -20, 50, 50 },
{ 20, 20, 50, 50 },
};
SkImageInfo info = SkImageInfo::MakeN32(100, 100, kPremul_SkAlphaType);
SkScalar MARGIN = SkIntToScalar(40);
SkScalar DX = info.width() + MARGIN;
SkScalar DY = info.height() + MARGIN;
canvas->translate(MARGIN, MARGIN);
sk_sp<SkSurface> surface = canvas->makeSurface(info);
if (!surface) {
surface = SkSurface::MakeRaster(info);
}
sk_tool_utils::draw_checkerboard(surface->getCanvas());
sk_sp<SkImage> source = surface->makeImageSnapshot();
for (auto clipBound : clipBounds) {
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
SkIRect outSubset;
SkIPoint offset;
sk_sp<SkImage> result = source->makeWithFilter(filters[i].get(), subset, clipBound,
&outSubset, &offset);
SkASSERT(result);
SkASSERT(source->isTextureBacked() == result->isTextureBacked());
result = result->makeSubset(outSubset);
canvas->drawImage(result.get(), SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
show_bounds(canvas, SkIRect::MakeXYWH(offset.x(), offset.y(), outSubset.width(),
outSubset.height()), clipBound);
canvas->translate(DX, 0);
}
canvas->restore();
canvas->translate(0, DY);
}
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setTextSize(100);
paint.setStyle(SkPaint::kStroke_Style);
paint.setTextScaleX(fScaleX);
paint.setTextSkewX(fSkewX);
const SkColor boundsColors[2] = { SK_ColorRED, SK_ColorBLUE };
SkFontMgr* fm = fFM;
int count = SkMin32(fm->countFamilies(), 32);
int index = 0;
SkScalar x = 0, y = 0;
canvas->translate(80, 120);
for (int i = 0; i < count; ++i) {
SkAutoTUnref<SkFontStyleSet> set(fm->createStyleSet(i));
for (int j = 0; j < set->count(); ++j) {
SkSafeUnref(paint.setTypeface(set->createTypeface(j)));
if (paint.getTypeface()) {
show_bounds(canvas, paint, x, y, boundsColors[index & 1]);
index += 1;
x += 160;
if (0 == (index % 6)) {
x = 0;
y += 160;
}
if (index >= 30) {
return;
}
}
}
}
}
