void onOnceBeforeDraw() override {
make_bitmap();
fCheckerboard.allocN32Pixels(80, 80);
SkCanvas checkerboardCanvas(fCheckerboard);
sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
}
virtual void onDraw(SkCanvas* canvas) {
if (!fInitialized) {
make_bitmap();
fCheckerboard.allocN32Pixels(80, 80);
SkCanvas checkerboardCanvas(fCheckerboard);
sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
fInitialized = true;
}
canvas->clear(0x00000000);
int x = 0, y = 0;
for (size_t i = 0; i < 4; i++) {
SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
SkRect srcRect = SkRect::MakeXYWH(SkIntToScalar(bitmap->width()/4),
SkIntToScalar(bitmap->height()/4),
SkIntToScalar(bitmap->width()/(i+1)),
SkIntToScalar(bitmap->height()/(i+1)));
SkRect dstRect = SkRect::MakeXYWH(SkIntToScalar(i * 8),
SkIntToScalar(i * 4),
SkIntToScalar(bitmap->width() - i * 12),
SkIntToScalar(bitmap->height()) - i * 12);
SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
SkAutoTUnref<SkImageFilter> filter(
SkTileImageFilter::Create(srcRect, dstRect, tileInput));
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
SkPaint paint;
paint.setImageFilter(filter);
canvas->drawBitmap(fBitmap, 0, 0, &paint);
canvas->restore();
x += bitmap->width() + MARGIN;
if (x + bitmap->width() > WIDTH) {
x = 0;
y += bitmap->height() + MARGIN;
}
}
SkScalar matrix[20] = { SK_Scalar1, 0, 0, 0, 0,
0, SK_Scalar1, 0, 0, 0,
0, 0, SK_Scalar1, 0, 0,
0, 0, 0, SK_Scalar1, 0 };
SkRect srcRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width()),
SkIntToScalar(fBitmap.height()));
SkRect dstRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() * 2),
SkIntToScalar(fBitmap.height() * 2));
SkAutoTUnref<SkImageFilter> tile(SkTileImageFilter::Create(srcRect, dstRect, NULL));
SkAutoTUnref<SkColorFilter> cf(SkColorMatrixFilter::Create(matrix));
SkAutoTUnref<SkImageFilter> cfif(SkColorFilterImageFilter::Create(cf, tile.get()));
SkPaint paint;
paint.setImageFilter(cfif);
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
canvas->clipRect(dstRect);
canvas->saveLayer(&dstRect, &paint);
canvas->drawBitmap(fBitmap, 0, 0);
canvas->restore();
canvas->restore();
}
virtual void onDraw(SkCanvas* canvas) {
if (!fInitialized) {
fCheckerboard.allocN32Pixels(64, 64);
SkCanvas checkerboardCanvas(fCheckerboard);
sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
this->make_gradient_circle(64, 64);
fInitialized = true;
}
canvas->clear(SK_ColorBLACK);
SkAutoTUnref<SkImageFilter> gradient(SkBitmapSource::Create(fGradientCircle));
SkAutoTUnref<SkImageFilter> checkerboard(SkBitmapSource::Create(fCheckerboard));
SkAutoTUnref<SkShader> noise(SkPerlinNoiseShader::CreateFractalNoise(
SkDoubleToScalar(0.1), SkDoubleToScalar(0.05), 1, 0));
SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
SkScalar spotExponent = SK_Scalar1;
SkScalar cutoffAngle = SkIntToScalar(15);
SkScalar kd = SkIntToScalar(2);
SkScalar surfaceScale = SkIntToScalar(1);
SkColor white(0xFFFFFFFF);
SkMatrix resizeMatrix;
resizeMatrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
SkImageFilter* filters[] = {
SkBlurImageFilter::Create(SkIntToScalar(4), SkIntToScalar(4)),
SkDropShadowImageFilter::Create(SkIntToScalar(5), SkIntToScalar(10),
SkIntToScalar(3), SkIntToScalar(3), SK_ColorYELLOW,
SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
SkDisplacementMapEffect::kR_ChannelSelectorType,
SkIntToScalar(12),
gradient.get(),
checkerboard.get()),
SkDilateImageFilter::Create(1, 1, checkerboard.get()),
SkErodeImageFilter::Create(1, 1, checkerboard.get()),
SkOffsetImageFilter::Create(SkIntToScalar(32), 0),
SkImageFilter::CreateMatrixFilter(resizeMatrix, kNone_SkFilterQuality),
SkRectShaderImageFilter::Create(noise),
SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd),
SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent,
cutoffAngle, white, surfaceScale, kd),
};
SkVector scales[] = {
SkVector::Make(SkScalarInvert(2), SkScalarInvert(2)),
SkVector::Make(SkIntToScalar(1), SkIntToScalar(1)),
SkVector::Make(SkIntToScalar(1), SkIntToScalar(2)),
SkVector::Make(SkIntToScalar(2), SkIntToScalar(1)),
SkVector::Make(SkIntToScalar(2), SkIntToScalar(2)),
};
SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
SkScalar margin = SkIntToScalar(16);
SkRect bounds = r;
bounds.outset(margin, margin);
for (size_t j = 0; j < SK_ARRAY_COUNT(scales); ++j) {
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
SkPaint paint;
paint.setColor(SK_ColorBLUE);
paint.setImageFilter(filters[i]);
paint.setAntiAlias(true);
canvas->save();
canvas->scale(scales[j].fX, scales[j].fY);
if (5 == i) {
canvas->translate(SkIntToScalar(-32), 0);
} else if (6 == i) {
canvas->scale(SkScalarInvert(RESIZE_FACTOR),
SkScalarInvert(RESIZE_FACTOR));
}
canvas->drawCircle(r.centerX(), r.centerY(),
SkScalarDiv(r.width()*2, SkIntToScalar(5)), paint);
canvas->restore();
canvas->translate(r.width() * scales[j].fX + margin, 0);
}
canvas->restore();
canvas->translate(0, r.height() * scales[j].fY + margin);
}
for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
filters[i]->unref();
}
}
