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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 "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
static 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);
SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
SkShader* shaderB = SkShader::CreateBitmapShader(bm,
SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
SkShader* shader = SkShader::CreateComposeShader(shaderB, shaderA, mode);
shaderA->unref();
shaderB->unref();
mode->unref();
return shader;
}
class ShaderView : public SampleView {
public:
SkShader* fShader;
SkBitmap fBitmap;
ShaderView() {
SkImageDecoder::DecodeFile("/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;
SkShader* shaderA = SkGradientShader::CreateLinear(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);
SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
fShader = SkShader::CreateComposeShader(shaderA, shaderB, mode);
shaderA->unref();
shaderB->unref();
mode->unref();
}
virtual ~ShaderView() {
SkSafeUnref(fShader);
}
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(SkIntToScalar(20), SkIntToScalar(120));
SkPaint paint;
SkRect r;
paint.setColor(SK_ColorGREEN);
canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
paint.setShader(fShader);
canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(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))->unref();
canvas->drawRect(r, paint);
}
SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
this->inval(nullptr);
return this->INHERITED::onFindClickHandler(x, y, modi);
}
bool onClick(Click* click) override {
return this->INHERITED::onClick(click);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShaderView; }
static SkViewRegister reg(MyFactory);
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