| /* |
| * 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 "include/core/SkCanvas.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkColorPriv.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkMaskFilter.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRegion.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkTime.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/utils/SkCamera.h" |
| #include "samplecode/Sample.h" |
| #include "src/core/SkClipOpPriv.h" |
| #include "src/utils/SkUTF.h" |
| |
| static void make_paint(SkPaint* paint, const SkMatrix& localMatrix) { |
| SkColor colors[] = { 0, SK_ColorWHITE }; |
| SkPoint pts[] = { { 0, 0 }, { 0, SK_Scalar1*20 } }; |
| paint->setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, |
| SkTileMode::kClamp, 0, &localMatrix)); |
| paint->setBlendMode(SkBlendMode::kDstIn); |
| } |
| |
| // test drawing with strips of fading gradient above and below |
| static void test_fade(SkCanvas* canvas) { |
| SkAutoCanvasRestore ar(canvas, true); |
| |
| SkRect r; |
| |
| SkPaint p; |
| p.setAlpha(0x88); |
| |
| SkAutoCanvasRestore ar2(canvas, false); |
| |
| // create the layers |
| |
| r.setWH(100, 100); |
| canvas->clipRect(r); |
| |
| r.fBottom = SkIntToScalar(20); |
| canvas->saveLayer(&r, nullptr); |
| |
| r.fTop = SkIntToScalar(80); |
| r.fBottom = SkIntToScalar(100); |
| canvas->saveLayer(&r, nullptr); |
| |
| // now draw the "content" |
| |
| if (true) { |
| r.setWH(100, 100); |
| |
| canvas->saveLayerAlpha(&r, 0x80); |
| |
| SkPaint p; |
| p.setColor(SK_ColorRED); |
| p.setAntiAlias(true); |
| canvas->drawOval(r, p); |
| |
| canvas->restore(); |
| } else { |
| r.setWH(100, 100); |
| |
| SkPaint p; |
| p.setColor(SK_ColorRED); |
| p.setAntiAlias(true); |
| canvas->drawOval(r, p); |
| } |
| |
| // return; |
| |
| // now apply an effect |
| SkMatrix m; |
| m.setScale(SK_Scalar1, -SK_Scalar1); |
| m.postTranslate(0, SkIntToScalar(100)); |
| |
| SkPaint paint; |
| make_paint(&paint, m); |
| r.setWH(100, 20); |
| // SkDebugf("--------- draw top grad\n"); |
| canvas->drawRect(r, paint); |
| |
| r.fTop = SkIntToScalar(80); |
| r.fBottom = SkIntToScalar(100); |
| // SkDebugf("--------- draw bot grad\n"); |
| canvas->drawRect(r, paint); |
| } |
| |
| class LayersView : public Sample { |
| public: |
| LayersView() {} |
| |
| protected: |
| SkString name() override { return SkString("Layers"); } |
| |
| void drawBG(SkCanvas* canvas) { |
| canvas->drawColor(SK_ColorGRAY); |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| this->drawBG(canvas); |
| |
| if (true) { |
| SkRect r; |
| r.setWH(220, 120); |
| SkPaint p; |
| canvas->saveLayer(&r, &p); |
| canvas->drawColor(0xFFFF0000); |
| p.setAlpha(0); // or 0 |
| p.setBlendMode(SkBlendMode::kSrc); |
| canvas->drawOval(r, p); |
| canvas->restore(); |
| return; |
| } |
| |
| if (false) { |
| SkRect r; |
| r.setWH(220, 120); |
| SkPaint p; |
| p.setAlpha(0x88); |
| p.setAntiAlias(true); |
| |
| if (true) { |
| canvas->saveLayer(&r, &p); |
| p.setColor(0xFFFF0000); |
| canvas->drawOval(r, p); |
| canvas->restore(); |
| } |
| |
| p.setColor(0xFF0000FF); |
| r.offset(SkIntToScalar(20), SkIntToScalar(50)); |
| canvas->drawOval(r, p); |
| } |
| |
| if (false) { |
| SkPaint p; |
| p.setAlpha(0x88); |
| p.setAntiAlias(true); |
| |
| canvas->translate(SkIntToScalar(300), 0); |
| |
| SkRect r; |
| r.setWH(220, 60); |
| |
| canvas->saveLayer(&r, &p); |
| |
| r.setWH(220, 120); |
| p.setColor(SK_ColorBLUE); |
| canvas->drawOval(r, p); |
| canvas->restore(); |
| return; |
| } |
| |
| test_fade(canvas); |
| } |
| |
| private: |
| using INHERITED = Sample; |
| }; |
| DEF_SAMPLE( return new LayersView; ) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #include "include/effects/SkImageFilters.h" |
| |
| #include "tools/Resources.h" |
| |
| class BackdropView : public Sample { |
| SkPoint fCenter; |
| SkScalar fAngle; |
| sk_sp<SkImage> fImage; |
| sk_sp<SkImageFilter> fFilter; |
| public: |
| BackdropView() { |
| fCenter.set(200, 150); |
| fAngle = 0; |
| fImage = GetResourceAsImage("images/mandrill_512.png"); |
| fFilter = SkImageFilters::Dilate(8, 8, nullptr); |
| } |
| |
| protected: |
| SkString name() override { return SkString("Backdrop"); } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| canvas->drawImage(fImage.get(), 0, 0); |
| |
| const SkScalar w = 250; |
| const SkScalar h = 150; |
| SkPath path; |
| path.addOval(SkRect::MakeXYWH(-w/2, -h/2, w, h)); |
| SkMatrix m; |
| m.setRotate(fAngle); |
| m.postTranslate(fCenter.x(), fCenter.y()); |
| path.transform(m); |
| |
| canvas->clipPath(path, kIntersect_SkClipOp, true); |
| const SkRect bounds = path.getBounds(); |
| |
| SkPaint paint; |
| paint.setAlpha(0xCC); |
| canvas->saveLayer(SkCanvas::SaveLayerRec(&bounds, &paint, fFilter.get(), 0)); |
| |
| canvas->restore(); |
| } |
| |
| bool onAnimate(double nanos) override { |
| fAngle = SkDoubleToScalar(fmod(1e-9 * nanos * 360 / 5, 360)); |
| return true; |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override { |
| return new Click(); |
| } |
| |
| bool onClick(Click* click) override { |
| fCenter = click->fCurr; |
| return true; |
| } |
| |
| private: |
| using INHERITED = Sample; |
| }; |
| DEF_SAMPLE( return new BackdropView; ) |