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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; )
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