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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 "gm/gm.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkPoint3.h"
- #include "include/core/SkRRect.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkTypes.h"
- #include "include/private/SkShadowFlags.h"
- #include "include/private/SkTArray.h"
- #include "include/private/SkTDArray.h"
- #include "include/utils/SkShadowUtils.h"
- #include <initializer_list>
- 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<SkPath> 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<SkPath> 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<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);
- for (auto& m : matrices) {
- for (int flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) {
- int pathCounter = 0;
- 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);
- // flip a couple of paths to test 180° rotation
- if (kTransparentOccluder_ShadowFlag == flags && 0 == pathCounter % 3) {
- canvas->save();
- canvas->rotate(180, 25, 25);
- }
- 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);
- if (kTransparentOccluder_ShadowFlag == flags && 0 == pathCounter % 3) {
- canvas->restore();
- }
- canvas->restore();
- canvas->translate(dx, 0);
- x += dx;
- dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
- ++pathCounter;
- }
- }
- }
- // 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);
- }
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