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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "DecodeFile.h"
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
static sk_sp<SkShader> make_bitmapfade(const SkBitmap& bm) {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(bm.height()));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0, 0, 0, 0);
auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
auto shaderB = SkShader::MakeBitmapShader(bm,
SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
return SkShader::MakeComposeShader(std::move(shaderB), std::move(shaderA), SkBlendMode::kDstIn);
}
class ShaderView : public SampleView {
public:
sk_sp<SkShader> fShader;
SkBitmap fBitmap;
ShaderView() {
decode_file("/skimages/logo.gif", &fBitmap);
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(100), 0);
colors[0] = SK_ColorRED;
colors[1] = SK_ColorBLUE;
auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(100));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
fShader = SkShader::MakeComposeShader(std::move(shaderA), std::move(shaderB),
SkBlendMode::kDstIn);
}
protected:
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Shaders");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
canvas->drawBitmap(fBitmap, 0, 0);
canvas->translate(20, 120);
SkPaint paint;
SkRect r;
paint.setColor(SK_ColorGREEN);
canvas->drawRect(SkRect::MakeWH(100, 100), paint);
paint.setShader(fShader);
canvas->drawRect(SkRect::MakeWH(100, 100), paint);
canvas->translate(SkIntToScalar(110), 0);
int w = fBitmap.width();
int h = fBitmap.height();
w = 120;
h = 80;
r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h));
paint.setShader(nullptr);
canvas->drawRect(r, paint);
paint.setShader(make_bitmapfade(fBitmap));
canvas->drawRect(r, paint);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShaderView; }
static SkViewRegister reg(MyFactory);
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