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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/SkPath.h"
- #include "include/core/SkPoint3.h"
- #include "include/effects/SkBlurMaskFilter.h"
- #include "include/pathops/SkPathOps.h"
- #include "include/utils/SkCamera.h"
- #include "include/utils/SkShadowUtils.h"
- #include "samplecode/Sample.h"
- #include "src/core/SkBlurMask.h"
- #include "src/utils/SkUTF.h"
- #include "tools/ToolUtils.h"
- ////////////////////////////////////////////////////////////////////////////
- class ShadowUtilsView : public Sample {
- SkTArray<SkPath> fConvexPaths;
- SkTArray<SkPath> fConcavePaths;
- SkScalar fZDelta;
- bool fShowAmbient;
- bool fShowSpot;
- bool fUseAlt;
- bool fShowObject;
- bool fIgnoreShadowAlpha;
- public:
- ShadowUtilsView()
- : fZDelta(0)
- , fShowAmbient(true)
- , fShowSpot(true)
- , fUseAlt(false)
- , fShowObject(false)
- , fIgnoreShadowAlpha(false) {}
- protected:
- void onOnceBeforeDraw() override {
- fConvexPaths.push_back().addRoundRect(SkRect::MakeWH(50, 50), 10, 10);
- SkRRect oddRRect;
- oddRRect.setNinePatch(SkRect::MakeWH(50, 50), 9, 13, 6, 16);
- fConvexPaths.push_back().addRRect(oddRRect);
- fConvexPaths.push_back().addRect(SkRect::MakeWH(50, 50));
- fConvexPaths.push_back().addCircle(25, 25, 25);
- fConvexPaths.push_back().cubicTo(100, 50, 20, 100, 0, 0);
- fConvexPaths.push_back().addOval(SkRect::MakeWH(20, 60));
- // star
- fConcavePaths.push_back().moveTo(0.0f, -33.3333f);
- fConcavePaths.back().lineTo(9.62f, -16.6667f);
- fConcavePaths.back().lineTo(28.867f, -16.6667f);
- fConcavePaths.back().lineTo(19.24f, 0.0f);
- fConcavePaths.back().lineTo(28.867f, 16.6667f);
- fConcavePaths.back().lineTo(9.62f, 16.6667f);
- fConcavePaths.back().lineTo(0.0f, 33.3333f);
- fConcavePaths.back().lineTo(-9.62f, 16.6667f);
- fConcavePaths.back().lineTo(-28.867f, 16.6667f);
- fConcavePaths.back().lineTo(-19.24f, 0.0f);
- fConcavePaths.back().lineTo(-28.867f, -16.6667f);
- fConcavePaths.back().lineTo(-9.62f, -16.6667f);
- fConcavePaths.back().close();
- // dumbbell
- fConcavePaths.push_back().moveTo(50, 0);
- fConcavePaths.back().cubicTo(100, 25, 60, 50, 50, 0);
- fConcavePaths.back().cubicTo(0, -25, 40, -50, 50, 0);
- }
- SkString name() override { return SkString("ShadowUtils"); }
- bool onChar(SkUnichar uni) override {
- bool handled = false;
- switch (uni) {
- case 'W':
- fShowAmbient = !fShowAmbient;
- handled = true;
- break;
- case 'S':
- fShowSpot = !fShowSpot;
- handled = true;
- break;
- case 'T':
- fUseAlt = !fUseAlt;
- handled = true;
- break;
- case 'O':
- fShowObject = !fShowObject;
- handled = true;
- break;
- case '>':
- fZDelta += 0.5f;
- handled = true;
- break;
- case '<':
- fZDelta -= 0.5f;
- handled = true;
- break;
- case '?':
- fIgnoreShadowAlpha = !fIgnoreShadowAlpha;
- handled = true;
- break;
- default:
- break;
- }
- if (handled) {
- return true;
- }
- return false;
- }
- void drawBG(SkCanvas* canvas) {
- canvas->drawColor(0xFFFFFFFF);
- }
- void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
- const SkPoint3& zPlaneParams,
- const SkPaint& paint, SkScalar ambientAlpha,
- const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha,
- uint32_t flags) {
- if (fIgnoreShadowAlpha) {
- ambientAlpha = 255;
- spotAlpha = 255;
- }
- if (!fShowAmbient) {
- ambientAlpha = 0;
- }
- if (!fShowSpot) {
- spotAlpha = 0;
- }
- if (fUseAlt) {
- flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
- }
- SkColor ambientColor = SkColorSetARGB(ambientAlpha * 255, 255, 0, 0);
- SkColor spotColor = SkColorSetARGB(spotAlpha * 255, 0, 0, 255);
- SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
- lightPos, lightWidth,
- ambientColor, spotColor, flags);
- if (fShowObject) {
- canvas->drawPath(path, paint);
- } else {
- SkPaint strokePaint;
- strokePaint.setColor(paint.getColor());
- strokePaint.setStyle(SkPaint::kStroke_Style);
- canvas->drawPath(path, strokePaint);
- }
- }
- void onDrawContent(SkCanvas* canvas) override {
- this->drawBG(canvas);
- static constexpr int kW = 800;
- static constexpr SkScalar kPad = 15.f;
- static constexpr SkScalar kLightR = 100.f;
- static constexpr SkScalar kHeight = 50.f;
- static constexpr SkScalar kAmbientAlpha = 0.5f;
- static constexpr SkScalar kSpotAlpha = 0.5f;
- static constexpr SkPoint3 lightPos = { 250, 400, 500 };
- canvas->translate(3 * kPad, 3 * kPad);
- canvas->save();
- SkScalar x = 0;
- SkScalar dy = 0;
- SkTDArray<SkMatrix> matrices;
- matrices.push()->reset();
- SkMatrix* m = matrices.push();
- m->setRotate(33.f, 25.f, 25.f);
- m->postScale(1.2f, 0.8f, 25.f, 25.f);
- SkPaint paint;
- paint.setColor(SK_ColorGREEN);
- paint.setAntiAlias(true);
- SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, SkTMax(1.0f, kHeight + fZDelta));
- // convex paths
- for (auto& m : matrices) {
- for (auto flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) {
- for (const auto& path : fConvexPaths) {
- SkRect postMBounds = path.getBounds();
- m.mapRect(&postMBounds);
- SkScalar w = postMBounds.width() + kHeight;
- SkScalar dx = w + kPad;
- if (x + dx > kW - 3 * kPad) {
- canvas->restore();
- canvas->translate(0, dy);
- canvas->save();
- x = 0;
- dy = 0;
- }
- canvas->save();
- canvas->concat(m);
- this->drawShadowedPath(canvas, path, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightR, kSpotAlpha, flags);
- canvas->restore();
- canvas->translate(dx, 0);
- x += dx;
- dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
- }
- }
- }
- // concave paths
- canvas->restore();
- canvas->translate(kPad, dy);
- canvas->save();
- x = kPad;
- dy = 0;
- for (auto& m : matrices) {
- for (const auto& path : fConcavePaths) {
- SkRect postMBounds = path.getBounds();
- m.mapRect(&postMBounds);
- SkScalar w = postMBounds.width();
- SkScalar dx = w + kPad;
- canvas->save();
- canvas->concat(m);
- this->drawShadowedPath(canvas, path, zPlaneParams, paint, kAmbientAlpha, lightPos,
- kLightR, kSpotAlpha, kNone_ShadowFlag);
- canvas->restore();
- canvas->translate(dx, 0);
- x += dx;
- dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
- }
- }
- // Show where the light is in x,y as a circle (specified in device space).
- SkMatrix invCanvasM = canvas->getTotalMatrix();
- if (invCanvasM.invert(&invCanvasM)) {
- canvas->save();
- canvas->concat(invCanvasM);
- SkPaint paint;
- paint.setColor(SK_ColorBLACK);
- paint.setAntiAlias(true);
- canvas->drawCircle(lightPos.fX, lightPos.fY, kLightR / 10.f, paint);
- canvas->restore();
- }
- }
- private:
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new ShadowUtilsView(); )
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