| /* |
| * 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, skui::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; ) |