skia2/samplecode/SampleMixer.cpp

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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkImage.h"
#include "include/core/SkPath.h"
#include "include/core/SkRegion.h"
#include "include/core/SkShader.h"
#include "include/effects/SkGradientShader.h"
#include "samplecode/Sample.h"
#include "src/core/SkUtils.h"
#include "tools/Resources.h"
const float gMat[] = {
.3f, .6f, .1f, 0, 0,
.3f, .6f, .1f, 0, 0,
.3f, .6f, .1f, 0, 0,
0, 0, 0, 1, 0,
};
class MixerView : public Sample {
sk_sp<SkImage> fImg;
sk_sp<SkColorFilter> fCF0;
sk_sp<SkColorFilter> fCF1;
float fWeight = 0;
float fDW = 0.02f;
public:
MixerView() {}
protected:
SkString name() override { return SkString("Mixer"); }
void dodraw(SkCanvas* canvas, sk_sp<SkColorFilter> cf0, sk_sp<SkColorFilter> cf1, float gap) {
SkPaint paint;
paint.setColorFilter(cf0);
canvas->drawImage(fImg, 0, 0, &paint);
paint.setColorFilter(SkColorFilters::Lerp(fWeight, cf0, cf1));
canvas->drawImage(fImg, fImg->width() + gap * fWeight, 0, &paint);
paint.setColorFilter(cf1);
canvas->drawImage(fImg, 2*fImg->width() + gap, 0, &paint);
}
void onDrawContent(SkCanvas* canvas) override {
if (!fImg) {
fImg = GetResourceAsImage("images/mandrill_256.png");
fCF0 = SkColorFilters::Matrix(gMat);
fCF1 = SkColorFilters::Blend(0xFF44CC88, SkBlendMode::kScreen);
}
float gap = fImg->width() * 3;
canvas->translate(10, 10);
dodraw(canvas, nullptr, fCF1, gap);
canvas->translate(0, fImg->height() + 10);
dodraw(canvas, fCF0, nullptr, gap);
canvas->translate(0, fImg->height() + 10);
dodraw(canvas, fCF0, fCF1, gap);
fWeight += fDW;
if (fWeight > 1 || fWeight < 0) {
fDW = -fDW;
}
}
virtual Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
return fRect.contains(SkScalarRoundToInt(x),
SkScalarRoundToInt(y)) ? new Click() : nullptr;
}
bool onClick(Click* click) override {
fRect.offset(click->fCurr.fX - click->fPrev.fX,
click->fCurr.fY - click->fPrev.fY);
return true;
}
private:
SkIRect fRect;
typedef Sample INHERITED;
};
DEF_SAMPLE( return new MixerView; )
//////////////////////////////////////////////////////////////////////////////
#include "include/core/SkMaskFilter.h"
#include "include/core/SkSurface.h"
static sk_sp<SkShader> make_resource_shader(const char path[], int size) {
auto img = GetResourceAsImage(path);
if (!img) {
return nullptr;
}
SkRect src = SkRect::MakeIWH(img->width(), img->height());
SkRect dst = SkRect::MakeIWH(size, size);
SkMatrix m;
m.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
return img->makeShader(&m);
}
class ShaderMixerView : public Sample {
sk_sp<SkShader> fSH0;
sk_sp<SkShader> fSH1;
sk_sp<SkSurface> fSurface;
SkBlendMode fMode = SkBlendMode::kClear;
enum { SIZE = 256 };
const SkRect fRect = SkRect::MakeXYWH(10, 10 + SIZE + 10, SIZE, SIZE);
public:
ShaderMixerView() {}
void onOnceBeforeDraw() override {
fSH0 = make_resource_shader("images/mandrill_256.png", SIZE);
fSH1 = make_resource_shader("images/baby_tux.png", SIZE);
}
protected:
SkString name() override { return SkString("ShaderMixer"); }
void onDrawContent(SkCanvas* canvas) override {
if (!fSurface) {
fSurface = canvas->makeSurface(SkImageInfo::MakeN32Premul(SIZE, SIZE));
}
SkPaint paint;
const SkRect r = SkRect::MakeIWH(SIZE, SIZE);
canvas->translate(10, 10);
canvas->save();
paint.setShader(fSH0); canvas->drawRect(r, paint);
canvas->translate(SIZE + 10.f, 0);
paint.setShader(fSH1); canvas->drawRect(r, paint);
canvas->restore();
canvas->translate(0, SIZE + 10.f);
auto sh = fSurface->makeImageSnapshot()->makeShader();
canvas->save();
paint.setShader(sh); canvas->drawRect(r, paint);
canvas->translate(SIZE + 10.f, 0);
paint.setShader(SkShaders::Lerp(sh, fSH0, fSH1)); canvas->drawRect(r, paint);
canvas->restore();
}
virtual Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
fMode = (fMode == SkBlendMode::kSrcOver) ? SkBlendMode::kClear : SkBlendMode::kSrcOver;
return fRect.contains(SkScalarRoundToInt(x),
SkScalarRoundToInt(y)) ? new Click() : nullptr;
}
bool onClick(Click* click) override {
SkPaint p;
p.setAntiAlias(true);
p.setColor(SK_ColorRED);
p.setBlendMode(fMode);
p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 12));
SkScalar x = click->fCurr.fX - fRect.fLeft;
SkScalar y = click->fCurr.fY - fRect.fTop;
fSurface->getCanvas()->drawCircle(x, y, 10, p);
return true;
}
private:
typedef Sample INHERITED;
};
DEF_SAMPLE( return new ShaderMixerView; )