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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "sk_tool_utils.h"
#include "SkBlurImageFilter.h"
#include "SkColor.h"
#include "SkDisplacementMapEffect.h"
#include "SkDropShadowImageFilter.h"
#include "SkGradientShader.h"
#include "SkImage.h"
#include "SkImageSource.h"
#include "SkMorphologyImageFilter.h"
#include "SkScalar.h"
#include "SkSurface.h"
#include "gm.h"
namespace skiagm {
// This GM draws image filters with a CTM containing shearing / rotation.
// It checks that the scale portion of the CTM is correctly extracted
// and applied to the image inputs separately from the non-scale portion.
static sk_sp<SkImage> make_gradient_circle(int width, int height) {
SkScalar x = SkIntToScalar(width / 2);
SkScalar y = SkIntToScalar(height / 2);
SkScalar radius = SkMinScalar(x, y) * 0.8f;
auto surface(SkSurface::MakeRasterN32Premul(width, height));
SkCanvas* canvas = surface->getCanvas();
canvas->clear(0x00000000);
SkColor colors[2];
colors[0] = SK_ColorWHITE;
colors[1] = SK_ColorBLACK;
SkPaint paint;
paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr, 2,
SkShader::kClamp_TileMode));
canvas->drawCircle(x, y, radius, paint);
return surface->makeImageSnapshot();
}
class ImageFiltersTransformedGM : public GM {
public:
ImageFiltersTransformedGM() {
this->setBGColor(SK_ColorBLACK);
}
protected:
SkString onShortName() override { return SkString("imagefilterstransformed"); }
SkISize onISize() override { return SkISize::Make(420, 240); }
void onOnceBeforeDraw() override {
fCheckerboard = SkImage::MakeFromBitmap(
sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8));
fGradientCircle = make_gradient_circle(64, 64);
}
void onDraw(SkCanvas* canvas) override {
sk_sp<SkImageFilter> gradient(SkImageSource::Make(fGradientCircle));
sk_sp<SkImageFilter> checkerboard(SkImageSource::Make(fCheckerboard));
sk_sp<SkImageFilter> filters[] = {
SkBlurImageFilter::Make(12, 0, nullptr),
SkDropShadowImageFilter::Make(0, 15, 8, 0, SK_ColorGREEN,
SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode, nullptr),
SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
SkDisplacementMapEffect::kR_ChannelSelectorType,
12,
std::move(gradient),
checkerboard),
SkDilateImageFilter::Make(2, 2, checkerboard),
SkErodeImageFilter::Make(2, 2, checkerboard),
};
const SkScalar margin = SkIntToScalar(20);
const SkScalar size = SkIntToScalar(60);
for (size_t j = 0; j < 3; j++) {
canvas->save();
canvas->translate(margin, 0);
for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
SkPaint paint;
paint.setColor(SK_ColorWHITE);
paint.setImageFilter(filters[i]);
paint.setAntiAlias(true);
canvas->save();
canvas->translate(size * SK_ScalarHalf, size * SK_ScalarHalf);
canvas->scale(SkDoubleToScalar(0.8), SkDoubleToScalar(0.8));
if (j == 1) {
canvas->rotate(SkIntToScalar(45));
} else if (j == 2) {
canvas->skew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
}
canvas->translate(-size * SK_ScalarHalf, -size * SK_ScalarHalf);
canvas->drawOval(SkRect::MakeXYWH(0, size * SkDoubleToScalar(0.1),
size, size * SkDoubleToScalar(0.6)), paint);
canvas->restore();
canvas->translate(size + margin, 0);
}
canvas->restore();
canvas->translate(0, size + margin);
}
}
private:
sk_sp<SkImage> fCheckerboard;
sk_sp<SkImage> fGradientCircle;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new ImageFiltersTransformedGM; )
}
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