/* * 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 fImg; sk_sp fCF0; sk_sp fCF1; float fWeight = 0; float fDW = 0.02f; public: MixerView() {} protected: SkString name() override { return SkString("Mixer"); } void dodraw(SkCanvas* canvas, sk_sp cf0, sk_sp 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 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 fSH0; sk_sp fSH1; sk_sp 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; )