/* * 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 "gm/gm.h" #include "include/core/SkCanvas.h" #include "include/core/SkPath.h" #include "include/utils/SkShadowUtils.h" #include "src/core/SkResourceCache.h" void draw_shadow(SkCanvas* canvas, const SkPath& path, SkScalar height, SkColor color, SkPoint3 lightPos, SkScalar lightR, bool isAmbient, uint32_t flags) { SkScalar ambientAlpha = isAmbient ? .5f : 0.f; SkScalar spotAlpha = isAmbient ? 0.f : .5f; SkColor ambientColor = SkColorSetARGB(ambientAlpha*SkColorGetA(color), SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)); SkColor spotColor = SkColorSetARGB(spotAlpha*SkColorGetA(color), SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)); SkShadowUtils::DrawShadow(canvas, path, SkPoint3{ 0, 0, height}, lightPos, lightR, ambientColor, spotColor, flags); } static constexpr int kW = 800; static constexpr int kH = 960; enum ShadowMode { kDebugColorNoOccluders, kDebugColorOccluders, kGrayscale }; void draw_paths(SkCanvas* canvas, ShadowMode mode) { SkTArray paths; paths.push_back().addRoundRect(SkRect::MakeWH(50, 50), 10, 10); SkRRect oddRRect; oddRRect.setNinePatch(SkRect::MakeWH(50, 50), 9, 13, 6, 16); paths.push_back().addRRect(oddRRect); paths.push_back().addRect(SkRect::MakeWH(50, 50)); paths.push_back().addCircle(25, 25, 25); paths.push_back().cubicTo(100, 50, 20, 100, 0, 0); paths.push_back().addOval(SkRect::MakeWH(20, 60)); // star SkTArray concavePaths; concavePaths.push_back().moveTo(0.0f, -33.3333f); concavePaths.back().lineTo(9.62f, -16.6667f); concavePaths.back().lineTo(28.867f, -16.6667f); concavePaths.back().lineTo(19.24f, 0.0f); concavePaths.back().lineTo(28.867f, 16.6667f); concavePaths.back().lineTo(9.62f, 16.6667f); concavePaths.back().lineTo(0.0f, 33.3333f); concavePaths.back().lineTo(-9.62f, 16.6667f); concavePaths.back().lineTo(-28.867f, 16.6667f); concavePaths.back().lineTo(-19.24f, 0.0f); concavePaths.back().lineTo(-28.867f, -16.6667f); concavePaths.back().lineTo(-9.62f, -16.6667f); concavePaths.back().close(); // dumbbell concavePaths.push_back().moveTo(50, 0); concavePaths.back().cubicTo(100, 25, 60, 50, 50, 0); concavePaths.back().cubicTo(0, -25, 40, -50, 50, 0); static constexpr SkScalar kPad = 15.f; static constexpr SkScalar kLightR = 100.f; static constexpr SkScalar kHeight = 50.f; // transform light position relative to canvas to handle tiling SkPoint lightXY = canvas->getTotalMatrix().mapXY(250, 400); SkPoint3 lightPos = { lightXY.fX, lightXY.fY, 500 }; canvas->translate(3 * kPad, 3 * kPad); canvas->save(); SkScalar x = 0; SkScalar dy = 0; SkTDArray 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); for (auto& m : matrices) { for (int flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) { for (const auto& path : paths) { 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); if (kDebugColorNoOccluders == mode || kDebugColorOccluders == mode) { draw_shadow(canvas, path, kHeight, SK_ColorRED, lightPos, kLightR, true, flags); draw_shadow(canvas, path, kHeight, SK_ColorBLUE, lightPos, kLightR, false, flags); } else if (kGrayscale == mode) { SkColor ambientColor = SkColorSetARGB(0.1f * 255, 0, 0, 0); SkColor spotColor = SkColorSetARGB(0.25f * 255, 0, 0, 0); SkShadowUtils::DrawShadow(canvas, path, SkPoint3{0, 0, kHeight}, lightPos, kLightR, ambientColor, spotColor, flags); } SkPaint paint; paint.setAntiAlias(true); if (kDebugColorNoOccluders == mode) { // Draw the path outline in green on top of the ambient and spot shadows. if (SkToBool(flags & kTransparentOccluder_ShadowFlag)) { paint.setColor(SK_ColorCYAN); } else { paint.setColor(SK_ColorGREEN); } paint.setStyle(SkPaint::kStroke_Style); paint.setStrokeWidth(0); } else { paint.setColor(kDebugColorOccluders == mode ? SK_ColorLTGRAY : SK_ColorWHITE); if (SkToBool(flags & kTransparentOccluder_ShadowFlag)) { paint.setAlphaf(0.5f); } paint.setStyle(SkPaint::kFill_Style); } canvas->drawPath(path, paint); 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 the concave paths we are not clipping, so transparent and opaque are the same for (const auto& path : concavePaths) { SkRect postMBounds = path.getBounds(); m.mapRect(&postMBounds); SkScalar w = postMBounds.width() + kHeight; SkScalar dx = w + kPad; canvas->save(); canvas->concat(m); if (kDebugColorNoOccluders == mode || kDebugColorOccluders == mode) { draw_shadow(canvas, path, kHeight, SK_ColorRED, lightPos, kLightR, true, kNone_ShadowFlag); draw_shadow(canvas, path, kHeight, SK_ColorBLUE, lightPos, kLightR, false, kNone_ShadowFlag); } else if (kGrayscale == mode) { SkColor ambientColor = SkColorSetARGB(0.1f * 255, 0, 0, 0); SkColor spotColor = SkColorSetARGB(0.25f * 255, 0, 0, 0); SkShadowUtils::DrawShadow(canvas, path, SkPoint3{ 0, 0, kHeight }, lightPos, kLightR, ambientColor, spotColor, kNone_ShadowFlag); } SkPaint paint; paint.setAntiAlias(true); if (kDebugColorNoOccluders == mode) { // Draw the path outline in green on top of the ambient and spot shadows. paint.setColor(SK_ColorGREEN); paint.setStyle(SkPaint::kStroke_Style); paint.setStrokeWidth(0); } else { paint.setColor(kDebugColorOccluders == mode ? SK_ColorLTGRAY : SK_ColorWHITE); paint.setStyle(SkPaint::kFill_Style); } canvas->drawPath(path, paint); 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(); } } DEF_SIMPLE_GM(shadow_utils, canvas, kW, kH) { draw_paths(canvas, kDebugColorNoOccluders); } DEF_SIMPLE_GM(shadow_utils_occl, canvas, kW, kH) { draw_paths(canvas, kDebugColorOccluders); } DEF_SIMPLE_GM(shadow_utils_gray, canvas, kW, kH) { draw_paths(canvas, kGrayscale); }