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060d982036
skia2/samplecode/SampleAndroidShadows.cpp
Jim Van Verth 060d982036 Combine the ambient and spot alphas into the base color 
for geometric shadows. 

This matches the analytic shadow approach better, and
is color space invariant.
Also includes cleanup in SampleAndroidShadows.

Bug: skia:6546
Change-Id: I7a7cd060420dae741f967334c8b19542a14f0bcf
Reviewed-on: https://skia-review.googlesource.com/15228
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2017-05-04 14:28:28 +00:00

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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkAnimTimer.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkColorFilter.h"
#include "SkCamera.h"
#include "SkCanvas.h"
#include "SkGaussianEdgeShader.h"
#include "SkPath.h"
#include "SkPathOps.h"
#include "SkPoint3.h"
#include "SkShadowUtils.h"
#include "SkUtils.h"
#include "SkView.h"
#include "sk_tool_utils.h"
////////////////////////////////////////////////////////////////////////////
class ShadowsView : public SampleView {
SkPath fRectPath;
SkPath fRRPath;
SkPath fCirclePath;
SkPath fFunkyRRPath;
SkPath fCubicPath;
SkPath fSquareRRectPath;
SkPath fWideRectPath;
SkPath fWideOvalPath;
SkPoint3 fLightPos;
SkScalar fZDelta;
SkScalar fAnimTranslate;
SkScalar fAnimAngle;
bool fShowAmbient;
bool fShowSpot;
bool fUseAlt;
bool fShowObject;
bool fIgnoreShadowAlpha;
public:
ShadowsView()
: fZDelta(0)
, fAnimTranslate(0)
, fAnimAngle(0)
, fShowAmbient(true)
, fShowSpot(true)
, fUseAlt(false)
, fShowObject(true)
, fIgnoreShadowAlpha(false) {}
protected:
void onOnceBeforeDraw() override {
fCirclePath.addCircle(0, 0, 50);
fRectPath.addRect(SkRect::MakeXYWH(-100, -50, 200, 100));
fRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-100, -50, 200, 100), 4, 4));
fFunkyRRPath.addRoundRect(SkRect::MakeXYWH(-50, -50, SK_Scalar1 * 100, SK_Scalar1 * 100),
40 * SK_Scalar1, 20 * SK_Scalar1,
SkPath::kCW_Direction);
fCubicPath.cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1,
20 * SK_Scalar1, 100 * SK_Scalar1,
0 * SK_Scalar1, 0 * SK_Scalar1);
fSquareRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-50, -50, 100, 100),
10, 10));
fWideRectPath.addRect(SkRect::MakeXYWH(0, 0, 630, 70));
fWideOvalPath.addOval(SkRect::MakeXYWH(0, 0, 630, 70));
fLightPos = SkPoint3::Make(350, 0, 600);
}
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "AndroidShadows");
return true;
}
SkUnichar uni;
if (SampleCode::CharQ(*evt, &uni)) {
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) {
this->inval(nullptr);
return true;
}
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
}
void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
std::function<SkScalar(SkScalar, SkScalar)> zFunc,
const SkPaint& paint, SkScalar ambientAlpha,
const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
if (!fShowAmbient) {
ambientAlpha = 0;
}
if (!fShowSpot) {
spotAlpha = 0;
}
uint32_t flags = 0;
if (fUseAlt) {
flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
}
//SkShadowUtils::DrawShadow(canvas, path,
// zValue,
// lightPos, lightWidth,
// ambientAlpha, spotAlpha, SK_ColorBLACK, flags);
SkShadowUtils::DrawUncachedShadow(canvas, path, zFunc,
lightPos, lightWidth,
ambientAlpha, spotAlpha, SK_ColorBLACK, 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);
const SkScalar kLightWidth = 800;
const SkScalar kAmbientAlpha = 0.1f;
const SkScalar kSpotAlpha = 0.25f;
SkPaint paint;
paint.setAntiAlias(true);
SkPoint3 lightPos = fLightPos;
paint.setColor(SK_ColorWHITE);
canvas->translate(200, 90);
SkScalar zValue = SkTMax(1.0f, 2 + fZDelta);
std::function<SkScalar(SkScalar, SkScalar)> zFunc =
[zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fRRPath, zFunc, paint, kAmbientAlpha,
lightPos, kLightWidth, kSpotAlpha);
paint.setColor(SK_ColorRED);
canvas->translate(250, 0);
zValue = SkTMax(1.0f, 8 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fRectPath, zFunc, paint, kAmbientAlpha,
lightPos, kLightWidth, kSpotAlpha);
paint.setColor(SK_ColorBLUE);
canvas->translate(-250, 110);
zValue = SkTMax(1.0f, 12 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fCirclePath, zFunc, paint, kAmbientAlpha,
lightPos, kLightWidth, 0.5f);
paint.setColor(SK_ColorGREEN);
canvas->translate(250, 0);
zValue = SkTMax(1.0f, 64 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fRRPath, zFunc, paint, kAmbientAlpha,
lightPos, kLightWidth, kSpotAlpha);
paint.setColor(SK_ColorYELLOW);
canvas->translate(-250, 110);
zValue = SkTMax(1.0f, 8 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fFunkyRRPath, zFunc, paint, kAmbientAlpha,
lightPos, kLightWidth, kSpotAlpha);
paint.setColor(SK_ColorCYAN);
canvas->translate(250, 0);
zValue = SkTMax(1.0f, 16 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, fCubicPath, zFunc, paint,
kAmbientAlpha, lightPos, kLightWidth, kSpotAlpha);
// circular reveal
SkPath tmpPath;
SkPath tmpClipPath;
tmpClipPath.addCircle(fAnimTranslate, 0, 60);
Op(fSquareRRectPath, tmpClipPath, kIntersect_SkPathOp, &tmpPath);
paint.setColor(SK_ColorMAGENTA);
canvas->translate(-125, 60);
zValue = SkTMax(1.0f, 32 + fZDelta);
zFunc = [zValue](SkScalar, SkScalar) { return zValue; };
this->drawShadowedPath(canvas, tmpPath, zFunc, paint, .1f,
lightPos, kLightWidth, .5f);
// perspective paths
SkPoint pivot = SkPoint::Make(fWideRectPath.getBounds().width()/2,
fWideRectPath.getBounds().height()/2);
SkPoint translate = SkPoint::Make(100, 450);
paint.setColor(SK_ColorWHITE);
Sk3DView view;
view.save();
view.rotateX(fAnimAngle);
SkMatrix persp;
view.getMatrix(&persp);
persp.preTranslate(-pivot.fX, -pivot.fY);
persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
canvas->setMatrix(persp);
zValue = SkTMax(1.0f, 16 + fZDelta);
SkScalar radians = SkDegreesToRadians(fAnimAngle);
zFunc = [zValue, pivot, radians](SkScalar x, SkScalar y) {
return SkScalarSin(-radians)*y +
zValue - SkScalarSin(-radians)*pivot.fY;
};
this->drawShadowedPath(canvas, fWideRectPath, zFunc, paint, .1f,
lightPos, kLightWidth, .5f);
pivot = SkPoint::Make(fWideOvalPath.getBounds().width() / 2,
fWideOvalPath.getBounds().height() / 2);
translate = SkPoint::Make(100, 600);
view.restore();
view.rotateY(fAnimAngle);
view.getMatrix(&persp);
persp.preTranslate(-pivot.fX, -pivot.fY);
persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
canvas->setMatrix(persp);
zValue = SkTMax(1.0f, 32 + fZDelta);
zFunc = [zValue, pivot, radians](SkScalar x, SkScalar y) {
return -SkScalarSin(radians)*x +
zValue + SkScalarSin(radians)*pivot.fX;
};
this->drawShadowedPath(canvas, fWideOvalPath, zFunc, paint, .1f,
lightPos, kLightWidth, .5f);
}
bool onAnimate(const SkAnimTimer& timer) override {
fAnimTranslate = timer.pingPong(30, 0, 200, -200);
fAnimAngle = timer.pingPong(15, 0, 0, 20);
return true;
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShadowsView; }
static SkViewRegister reg(MyFactory);
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