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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkBlurImageFilter.h"
#include "SkCanvas.h"
#include "SkColorFilter.h"
#include "SkColorFilterImageFilter.h"
#include "SkDropShadowImageFilter.h"
#include "SkSurface.h"
///////////////////////////////////////////////////////////////////////////////
static void show_bounds(SkCanvas* canvas, const SkIRect& subset, const SkIRect& clip) {
SkIRect rects[] { subset, clip };
SkColor colors[] { SK_ColorRED, SK_ColorBLUE };
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
for (size_t i = 0; i < SK_ARRAY_COUNT(rects); ++i) {
paint.setColor(colors[i]);
canvas->drawRect(SkRect::Make(rects[i]), paint);
}
}
// In this GM, we're going to feed the inner portion of a 100x100 checkboard
// (i.e., strip off a 25-wide border) through the makeWithFilter method.
// We'll then draw the appropriate subset of the result to the screen at the
// given offset.
class ImageMakeWithFilterGM : public skiagm::GM {
public:
ImageMakeWithFilterGM () {}
protected:
SkString onShortName() override {
return SkString("imagemakewithfilter");
}
SkISize onISize() override { return SkISize::Make(440, 530); }
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);
}
}
private:
typedef GM INHERITED;
};
DEF_GM( return new ImageMakeWithFilterGM; )
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