skia2/gm/reveal.cpp
2016-09-14 07:04:49 -07:00

437 lines
12 KiB
C++

/*
* 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 "gm.h"
#include "SkAnimTimer.h"
#include "SkBlurMaskFilter.h"
#include "SkGaussianEdgeShader.h"
#include "SkRRectsGaussianEdgeShader.h"
#include "SkPath.h"
#include "SkPathOps.h"
#include "SkRRect.h"
#include "SkStroke.h"
constexpr int kNumCols = 2;
constexpr int kNumRows = 5;
constexpr int kCellSize = 128;
constexpr SkScalar kPad = 8.0f;
constexpr SkScalar kPeriod = 8.0f;
constexpr int kClipOffset = 32;
///////////////////////////////////////////////////////////////////////////////////////////////////
class Object {
public:
virtual ~Object() {}
virtual bool asRRect(SkRRect* rr) const = 0;
virtual SkPath asPath(SkScalar inset) const = 0;
virtual void draw(SkCanvas* canvas, const SkPaint& paint) const = 0;
virtual void clip(SkCanvas* canvas) const = 0;
virtual bool contains(const SkRect& r) const = 0;
virtual const SkRect& bounds() const = 0;
};
typedef Object* (*PFMakeMthd)(const SkRect& r);
class RRect : public Object {
public:
RRect(const SkRect& r) {
fRRect = SkRRect::MakeRectXY(r, 4*kPad, 4*kPad);
}
bool asRRect(SkRRect* rr) const override {
*rr = fRRect;
return true;
}
SkPath asPath(SkScalar inset) const override {
SkRRect tmp = fRRect;
tmp.inset(inset, inset);
SkPath p;
p.addRRect(tmp);
return p;
}
void draw(SkCanvas* canvas, const SkPaint& paint) const override {
canvas->drawRRect(fRRect, paint);
}
void clip(SkCanvas* canvas) const override {
canvas->clipRRect(fRRect);
}
bool contains(const SkRect& r) const override {
return fRRect.contains(r);
}
const SkRect& bounds() const override {
return fRRect.getBounds();
}
static Object* Make(const SkRect& r) {
return new RRect(r);
}
private:
SkRRect fRRect;
};
class StrokedRRect : public Object {
public:
StrokedRRect(const SkRect& r) {
fRRect = SkRRect::MakeRectXY(r, 2*kPad, 2*kPad);
fStrokedBounds = r.makeOutset(kPad, kPad);
}
bool asRRect(SkRRect* rr) const override {
return false;
}
SkPath asPath(SkScalar inset) const override {
SkRRect tmp = fRRect;
tmp.inset(inset, inset);
// In this case we want the outline of the stroked rrect
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(kPad);
SkPath p, stroked;
p.addRRect(tmp);
SkStroke stroke(paint);
stroke.strokePath(p, &stroked);
return stroked;
}
void draw(SkCanvas* canvas, const SkPaint& paint) const override {
SkPaint stroke(paint);
stroke.setStyle(SkPaint::kStroke_Style);
stroke.setStrokeWidth(kPad);
canvas->drawRRect(fRRect, stroke);
}
void clip(SkCanvas* canvas) const override {
canvas->clipPath(this->asPath(0.0f));
}
bool contains(const SkRect& r) const override {
return false;
}
const SkRect& bounds() const override {
return fStrokedBounds;
}
static Object* Make(const SkRect& r) {
return new StrokedRRect(r);
}
private:
SkRRect fRRect;
SkRect fStrokedBounds;
};
class Oval : public Object {
public:
Oval(const SkRect& r) {
fRRect = SkRRect::MakeOval(r);
}
bool asRRect(SkRRect* rr) const override {
*rr = fRRect;
return true;
}
SkPath asPath(SkScalar inset) const override {
SkRRect tmp = fRRect;
tmp.inset(inset, inset);
SkPath p;
p.addRRect(tmp);
return p;
}
void draw(SkCanvas* canvas, const SkPaint& paint) const override {
canvas->drawRRect(fRRect, paint);
}
void clip(SkCanvas* canvas) const override {
canvas->clipRRect(fRRect);
}
bool contains(const SkRect& r) const override {
return fRRect.contains(r);
}
const SkRect& bounds() const override {
return fRRect.getBounds();
}
static Object* Make(const SkRect& r) {
return new Oval(r);
}
private:
SkRRect fRRect;
};
class Rect : public Object {
public:
Rect(const SkRect& r) : fRect(r) { }
bool asRRect(SkRRect* rr) const override {
*rr = SkRRect::MakeRect(fRect);
return true;
}
SkPath asPath(SkScalar inset) const override {
SkRect tmp = fRect;
tmp.inset(inset, inset);
SkPath p;
p.addRect(tmp);
return p;
}
void draw(SkCanvas* canvas, const SkPaint& paint) const override {
canvas->drawRect(fRect, paint);
}
void clip(SkCanvas* canvas) const override {
canvas->clipRect(fRect);
}
bool contains(const SkRect& r) const override {
return fRect.contains(r);
}
const SkRect& bounds() const override {
return fRect;
}
static Object* Make(const SkRect& r) {
return new Rect(r);
}
private:
SkRect fRect;
};
class Pentagon : public Object {
public:
Pentagon(const SkRect& r) {
SkPoint points[5] = {
{ 0.000000f, -1.000000f },
{ -0.951056f, -0.309017f },
{ -0.587785f, 0.809017f },
{ 0.587785f, 0.809017f },
{ 0.951057f, -0.309017f },
};
SkScalar height = r.height()/2.0f;
SkScalar width = r.width()/2.0f;
fPath.moveTo(r.centerX() + points[0].fX * width, r.centerY() + points[0].fY * height);
fPath.lineTo(r.centerX() + points[1].fX * width, r.centerY() + points[1].fY * height);
fPath.lineTo(r.centerX() + points[2].fX * width, r.centerY() + points[2].fY * height);
fPath.lineTo(r.centerX() + points[3].fX * width, r.centerY() + points[3].fY * height);
fPath.lineTo(r.centerX() + points[4].fX * width, r.centerY() + points[4].fY * height);
fPath.close();
}
bool asRRect(SkRRect* rr) const override {
return false;
}
SkPath asPath(SkScalar inset) const override { return fPath; }
void draw(SkCanvas* canvas, const SkPaint& paint) const override {
canvas->drawPath(fPath, paint);
}
void clip(SkCanvas* canvas) const override {
canvas->clipPath(this->asPath(0.0f));
}
bool contains(const SkRect& r) const override {
return false;
}
const SkRect& bounds() const override {
return fPath.getBounds();
}
static Object* Make(const SkRect& r) {
return new Pentagon(r);
}
private:
SkPath fPath;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace skiagm {
// This GM attempts to mimic Android's reveal animation
class RevealGM : public GM {
public:
enum Mode {
kGaussianEdge_Mode,
kBlurMask_Mode,
kRRectsGaussianEdge_Mode,
kLast_Mode = kRRectsGaussianEdge_Mode
};
static const int kModeCount = kLast_Mode + 1;
RevealGM() : fFraction(0.5f), fMode(kRRectsGaussianEdge_Mode), fPause(false) {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
}
protected:
SkString onShortName() override {
return SkString("reveal");
}
SkISize onISize() override {
return SkISize::Make(kNumCols * kCellSize, kNumRows * kCellSize);
}
void onDraw(SkCanvas* canvas) override {
PFMakeMthd clipMakes[kNumCols] = { Oval::Make, Rect::Make };
PFMakeMthd drawMakes[kNumRows] = {
RRect::Make, StrokedRRect::Make, Oval::Make, Rect::Make, Pentagon::Make
};
SkPaint strokePaint;
strokePaint.setColor(SK_ColorGREEN);
strokePaint.setStyle(SkPaint::kStroke_Style);
strokePaint.setStrokeWidth(0.0f);
for (int y = 0; y < kNumRows; ++y) {
for (int x = 0; x < kNumCols; ++x) {
SkRect cell = SkRect::MakeXYWH(SkIntToScalar(x*kCellSize),
SkIntToScalar(y*kCellSize),
SkIntToScalar(kCellSize),
SkIntToScalar(kCellSize));
canvas->save();
canvas->clipRect(cell);
cell.inset(kPad, kPad);
SkPoint clipCenter = SkPoint::Make(cell.centerX() - kClipOffset,
cell.centerY() + kClipOffset);
SkScalar curSize = kCellSize * fFraction;
const SkRect clipRect = SkRect::MakeLTRB(clipCenter.fX - curSize,
clipCenter.fY - curSize,
clipCenter.fX + curSize,
clipCenter.fY + curSize);
SkAutoTDelete<Object> clipObj((*clipMakes[x])(clipRect));
SkAutoTDelete<Object> drawObj((*drawMakes[y])(cell));
// The goal is to replace this clipped draw (which clips the
// shadow) with a draw using the geometric clip
if (kGaussianEdge_Mode == fMode) {
canvas->save();
clipObj->clip(canvas);
// Draw with GaussianEdgeShader
SkPaint paint;
paint.setAntiAlias(true);
// G channel is an F6.2 radius
paint.setColor(SkColorSetARGB(255, 0, (unsigned char)(4*kPad), 0));
paint.setShader(SkGaussianEdgeShader::Make());
drawObj->draw(canvas, paint);
canvas->restore();
} else if (kBlurMask_Mode == fMode) {
SkPath clippedPath;
SkScalar sigma = kPad / 4.0f;
if (clipObj->contains(drawObj->bounds())) {
clippedPath = drawObj->asPath(2.0f*sigma);
} else {
SkPath drawnPath = drawObj->asPath(2.0f*sigma);
SkPath clipPath = clipObj->asPath(2.0f*sigma);
SkAssertResult(Op(clipPath, drawnPath, kIntersect_SkPathOp, &clippedPath));
}
SkPaint blurPaint;
blurPaint.setAntiAlias(true);
blurPaint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, sigma));
canvas->drawPath(clippedPath, blurPaint);
} else {
SkASSERT(kRRectsGaussianEdge_Mode == fMode);
SkRect cover = drawObj->bounds();
SkAssertResult(cover.intersect(clipObj->bounds()));
SkPaint paint;
SkRRect clipRR, drawnRR;
if (clipObj->asRRect(&clipRR) && drawObj->asRRect(&drawnRR)) {
paint.setShader(SkRRectsGaussianEdgeShader::Make(clipRR, drawnRR,
kPad, 0.0f));
}
canvas->drawRect(cover, paint);
}
// Draw the clip and draw objects for reference
SkPaint strokePaint;
strokePaint.setStyle(SkPaint::kStroke_Style);
strokePaint.setStrokeWidth(0);
strokePaint.setColor(SK_ColorRED);
canvas->drawPath(drawObj->asPath(0.0f), strokePaint);
strokePaint.setColor(SK_ColorGREEN);
canvas->drawPath(clipObj->asPath(0.0f), strokePaint);
canvas->restore();
}
}
}
bool onHandleKey(SkUnichar uni) override {
switch (uni) {
case 'C':
fMode = (Mode)((fMode + 1) % kModeCount);
return true;
case 'p':
fPause = !fPause;
return true;
}
return false;
}
bool onAnimate(const SkAnimTimer& timer) override {
if (!fPause) {
fFraction = timer.pingPong(kPeriod, 0.0f, 0.0f, 1.0f);
}
return true;
}
private:
SkScalar fFraction;
Mode fMode;
bool fPause;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new RevealGM;)
}