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skia2/gm/strokes.cpp
caryclark 40b7d3b48b fix hair fuzz 
If the end and control points of a quad, conic, or cubic are the same,
adjust all of them when stretching the curve to account for a square
or round end cap. If all of the points are the same, move all but the
last.

Enlarge the clip check to account for the cap.

The clip bug was detected by ASAN.

R=reed@google.com, msarett@google.com
BUG=571214
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1547483003

Review URL: https://codereview.chromium.org/1547483003
2015-12-22 06:13:33 -08:00

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/*
* Copyright 2011 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 "SkPath.h"
#include "SkRandom.h"
#include "SkDashPathEffect.h"
#include "SkParsePath.h"
#define W 400
#define H 400
#define N 50
static const SkScalar SW = SkIntToScalar(W);
static const SkScalar SH = SkIntToScalar(H);
static void rnd_rect(SkRect* r, SkPaint* paint, SkRandom& rand) {
SkScalar x = rand.nextUScalar1() * W;
SkScalar y = rand.nextUScalar1() * H;
SkScalar w = rand.nextUScalar1() * (W >> 2);
SkScalar h = rand.nextUScalar1() * (H >> 2);
SkScalar hoffset = rand.nextSScalar1();
SkScalar woffset = rand.nextSScalar1();
r->set(x, y, x + w, y + h);
r->offset(-w/2 + woffset, -h/2 + hoffset);
paint->setColor(rand.nextU());
paint->setAlpha(0xFF);
}
class StrokesGM : public skiagm::GM {
public:
StrokesGM() {}
protected:
SkString onShortName() override {
return SkString("strokes_round");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(9)/2);
for (int y = 0; y < 2; y++) {
paint.setAntiAlias(!!y);
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(0, SH * y);
canvas->clipRect(SkRect::MakeLTRB(
SkIntToScalar(2), SkIntToScalar(2)
, SW - SkIntToScalar(2), SH - SkIntToScalar(2)
));
SkRandom rand;
for (int i = 0; i < N; i++) {
SkRect r;
rnd_rect(&r, &paint, rand);
canvas->drawOval(r, paint);
rnd_rect(&r, &paint, rand);
canvas->drawRoundRect(r, r.width()/4, r.height()/4, paint);
rnd_rect(&r, &paint, rand);
}
}
}
private:
typedef skiagm::GM INHERITED;
};
/* See
https://code.google.com/p/chromium/issues/detail?id=422974 and
http://jsfiddle.net/1xnku3sg/2/
*/
class ZeroLenStrokesGM : public skiagm::GM {
SkPath fMoveHfPath, fMoveZfPath, fDashedfPath, fRefPath[4];
SkPath fCubicPath, fQuadPath, fLinePath;
protected:
void onOnceBeforeDraw() override {
SkAssertResult(SkParsePath::FromSVGString("M0,0h0M10,0h0M20,0h0", &fMoveHfPath));
SkAssertResult(SkParsePath::FromSVGString("M0,0zM10,0zM20,0z", &fMoveZfPath));
SkAssertResult(SkParsePath::FromSVGString("M0,0h25", &fDashedfPath));
SkAssertResult(SkParsePath::FromSVGString("M 0 0 C 0 0 0 0 0 0", &fCubicPath));
SkAssertResult(SkParsePath::FromSVGString("M 0 0 Q 0 0 0 0", &fQuadPath));
SkAssertResult(SkParsePath::FromSVGString("M 0 0 L 0 0", &fLinePath));
for (int i = 0; i < 3; ++i) {
fRefPath[0].addCircle(i * 10.f, 0, 5);
fRefPath[1].addCircle(i * 10.f, 0, 10);
fRefPath[2].addRect(i * 10.f - 4, -2, i * 10.f + 4, 6);
fRefPath[3].addRect(i * 10.f - 10, -10, i * 10.f + 10, 10);
}
}
SkString onShortName() override {
return SkString("zeroPath");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
void onDraw(SkCanvas* canvas) override {
SkPaint fillPaint, strokePaint, dashPaint;
fillPaint.setAntiAlias(true);
strokePaint = fillPaint;
strokePaint.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i < 2; ++i) {
fillPaint.setAlpha(255);
strokePaint.setAlpha(255);
strokePaint.setStrokeWidth(i ? 8.f : 10.f);
strokePaint.setStrokeCap(i ? SkPaint::kSquare_Cap : SkPaint::kRound_Cap);
canvas->save();
canvas->translate(10 + i * 100.f, 10);
canvas->drawPath(fMoveHfPath, strokePaint);
canvas->translate(0, 20);
canvas->drawPath(fMoveZfPath, strokePaint);
dashPaint = strokePaint;
const SkScalar intervals[] = { 0, 10 };
dashPaint.setPathEffect(SkDashPathEffect::Create(intervals, 2, 0))->unref();
SkPath fillPath;
dashPaint.getFillPath(fDashedfPath, &fillPath);
canvas->translate(0, 20);
canvas->drawPath(fDashedfPath, dashPaint);
canvas->translate(0, 20);
canvas->drawPath(fRefPath[i * 2], fillPaint);
strokePaint.setStrokeWidth(20);
strokePaint.setAlpha(127);
canvas->translate(0, 50);
canvas->drawPath(fMoveHfPath, strokePaint);
canvas->translate(0, 30);
canvas->drawPath(fMoveZfPath, strokePaint);
canvas->translate(0, 30);
fillPaint.setAlpha(127);
canvas->drawPath(fRefPath[1 + i * 2], fillPaint);
canvas->translate(0, 30);
canvas->drawPath(fCubicPath, strokePaint);
canvas->translate(0, 30);
canvas->drawPath(fQuadPath, strokePaint);
canvas->translate(0, 30);
canvas->drawPath(fLinePath, strokePaint);
canvas->restore();
}
}
private:
typedef skiagm::GM INHERITED;
};
class TeenyStrokesGM : public skiagm::GM {
SkString onShortName() override {
return SkString("teenyStrokes");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
static void line(SkScalar scale, SkCanvas* canvas, SkColor color) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setColor(color);
canvas->translate(50, 0);
canvas->save();
p.setStrokeWidth(scale * 5);
canvas->scale(1 / scale, 1 / scale);
canvas->drawLine(20 * scale, 20 * scale, 20 * scale, 100 * scale, p);
canvas->drawLine(20 * scale, 20 * scale, 100 * scale, 100 * scale, p);
canvas->restore();
}
void onDraw(SkCanvas* canvas) override {
line(0.00005f, canvas, SK_ColorBLACK);
line(0.000045f, canvas, SK_ColorRED);
line(0.0000035f, canvas, SK_ColorGREEN);
line(0.000003f, canvas, SK_ColorBLUE);
line(0.000002f, canvas, SK_ColorBLACK);
}
private:
typedef skiagm::GM INHERITED;
};
DEF_SIMPLE_GM(CubicStroke, canvas, 384, 384) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(1.0720f);
SkPath path;
path.moveTo(-6000,-6000);
path.cubicTo(-3500,5500,-500,5500,2500,-6500);
canvas->drawPath(path, p);
p.setStrokeWidth(1.0721f);
canvas->translate(10, 10);
canvas->drawPath(path, p);
p.setStrokeWidth(1.0722f);
canvas->translate(10, 10);
canvas->drawPath(path, p);
}
DEF_SIMPLE_GM(zerolinestroke, canvas, 90, 120) {
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(20);
paint.setAntiAlias(true);
paint.setStrokeCap(SkPaint::kRound_Cap);
SkPath path;
path.moveTo(30, 90);
path.lineTo(30, 90);
path.lineTo(60, 90);
path.lineTo(60, 90);
canvas->drawPath(path, paint);
path.reset();
path.moveTo(30, 30);
path.lineTo(60, 30);
canvas->drawPath(path, paint);
path.reset();
path.moveTo(30, 60);
path.lineTo(30, 60);
path.lineTo(60, 60);
canvas->drawPath(path, paint);
}
DEF_SIMPLE_GM(quadcap, canvas, 200, 200) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(0);
SkPath path;
SkPoint pts[] = {{105.738571f,13.126318f},
{105.738571f,13.126318f},
{123.753784f,1.f}};
SkVector tangent = pts[1] - pts[2];
tangent.normalize();
SkPoint pts2[3];
memcpy(pts2, pts, sizeof(pts));
const SkScalar capOutset = SK_ScalarPI / 8;
pts2[0].fX += tangent.fX * capOutset;
pts2[0].fY += tangent.fY * capOutset;
pts2[1].fX += tangent.fX * capOutset;
pts2[1].fY += tangent.fY * capOutset;
pts2[2].fX += -tangent.fX * capOutset;
pts2[2].fY += -tangent.fY * capOutset;
path.moveTo(pts2[0]);
path.quadTo(pts2[1], pts2[2]);
canvas->drawPath(path, p);
path.reset();
path.moveTo(pts[0]);
path.quadTo(pts[1], pts[2]);
p.setStrokeCap(SkPaint::kRound_Cap);
canvas->translate(30, 0);
canvas->drawPath(path, p);
}
class Strokes2GM : public skiagm::GM {
SkPath fPath;
protected:
void onOnceBeforeDraw() override {
SkRandom rand;
fPath.moveTo(0, 0);
for (int i = 0; i < 13; i++) {
SkScalar x = rand.nextUScalar1() * (W >> 1);
SkScalar y = rand.nextUScalar1() * (H >> 1);
fPath.lineTo(x, y);
}
}
SkString onShortName() override {
return SkString("strokes_poly");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
static void rotate(SkScalar angle, SkScalar px, SkScalar py, SkCanvas* canvas) {
SkMatrix matrix;
matrix.setRotate(angle, px, py);
canvas->concat(matrix);
}
void onDraw(SkCanvas* canvas) override {
canvas->drawColor(SK_ColorWHITE);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(9)/2);
for (int y = 0; y < 2; y++) {
paint.setAntiAlias(!!y);
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(0, SH * y);
canvas->clipRect(SkRect::MakeLTRB(SkIntToScalar(2),
SkIntToScalar(2),
SW - SkIntToScalar(2),
SH - SkIntToScalar(2)));
SkRandom rand;
for (int i = 0; i < N/2; i++) {
SkRect r;
rnd_rect(&r, &paint, rand);
rotate(SkIntToScalar(15), SW/2, SH/2, canvas);
canvas->drawPath(fPath, paint);
}
}
}
private:
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkRect inset(const SkRect& r) {
SkRect rr(r);
rr.inset(r.width()/10, r.height()/10);
return rr;
}
class Strokes3GM : public skiagm::GM {
static void make0(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPath::kCW_Direction);
path->addRect(inset(bounds), SkPath::kCW_Direction);
title->set("CW CW");
}
static void make1(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPath::kCW_Direction);
path->addRect(inset(bounds), SkPath::kCCW_Direction);
title->set("CW CCW");
}
static void make2(SkPath* path, const SkRect& bounds, SkString* title) {
path->addOval(bounds, SkPath::kCW_Direction);
path->addOval(inset(bounds), SkPath::kCW_Direction);
title->set("CW CW");
}
static void make3(SkPath* path, const SkRect& bounds, SkString* title) {
path->addOval(bounds, SkPath::kCW_Direction);
path->addOval(inset(bounds), SkPath::kCCW_Direction);
title->set("CW CCW");
}
static void make4(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPath::kCW_Direction);
SkRect r = bounds;
r.inset(bounds.width() / 10, -bounds.height() / 10);
path->addOval(r, SkPath::kCW_Direction);
title->set("CW CW");
}
static void make5(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPath::kCW_Direction);
SkRect r = bounds;
r.inset(bounds.width() / 10, -bounds.height() / 10);
path->addOval(r, SkPath::kCCW_Direction);
title->set("CW CCW");
}
public:
Strokes3GM() {}
protected:
SkString onShortName() override {
return SkString("strokes3");
}
SkISize onISize() override {
return SkISize::Make(1500, 1500);
}
void onDraw(SkCanvas* canvas) override {
SkPaint origPaint;
origPaint.setAntiAlias(true);
origPaint.setStyle(SkPaint::kStroke_Style);
SkPaint fillPaint(origPaint);
fillPaint.setColor(SK_ColorRED);
SkPaint strokePaint(origPaint);
strokePaint.setColor(sk_tool_utils::color_to_565(0xFF4444FF));
void (*procs[])(SkPath*, const SkRect&, SkString*) = {
make0, make1, make2, make3, make4, make5
};
canvas->translate(SkIntToScalar(20), SkIntToScalar(80));
SkRect bounds = SkRect::MakeWH(SkIntToScalar(50), SkIntToScalar(50));
SkScalar dx = bounds.width() * 4/3;
SkScalar dy = bounds.height() * 5;
for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
SkPath orig;
SkString str;
procs[i](&orig, bounds, &str);
canvas->save();
for (int j = 0; j < 13; ++j) {
strokePaint.setStrokeWidth(SK_Scalar1 * j * j);
canvas->drawPath(orig, strokePaint);
canvas->drawPath(orig, origPaint);
SkPath fill;
strokePaint.getFillPath(orig, &fill);
canvas->drawPath(fill, fillPaint);
canvas->translate(dx + strokePaint.getStrokeWidth(), 0);
}
canvas->restore();
canvas->translate(0, dy);
}
}
private:
typedef skiagm::GM INHERITED;
};
class Strokes4GM : public skiagm::GM {
public:
Strokes4GM() {}
protected:
SkString onShortName() override {
return SkString("strokes_zoomed");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(0.055f);
canvas->scale(1000, 1000);
canvas->drawCircle(0, 2, 1.97f, paint);
}
private:
typedef skiagm::GM INHERITED;
};
// Test stroking for curves that produce degenerate tangents when t is 0 or 1 (see bug 4191)
class Strokes5GM : public skiagm::GM {
public:
Strokes5GM() {}
protected:
SkString onShortName() override {
return SkString("zero_control_stroke");
}
SkISize onISize() override {
return SkISize::Make(W, H*2);
}
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(40);
p.setStrokeCap(SkPaint::kButt_Cap);
SkPath path;
path.moveTo(157.474f,111.753f);
path.cubicTo(128.5f,111.5f,35.5f,29.5f,35.5f,29.5f);
canvas->drawPath(path, p);
path.reset();
path.moveTo(250, 50);
path.quadTo(280, 80, 280, 80);
canvas->drawPath(path, p);
path.reset();
path.moveTo(150, 50);
path.conicTo(180, 80, 180, 80, 0.707f);
canvas->drawPath(path, p);
path.reset();
path.moveTo(157.474f,311.753f);
path.cubicTo(157.474f,311.753f,85.5f,229.5f,35.5f,229.5f);
canvas->drawPath(path, p);
path.reset();
path.moveTo(280, 250);
path.quadTo(280, 250, 310, 280);
canvas->drawPath(path, p);
path.reset();
path.moveTo(180, 250);
path.conicTo(180, 250, 210, 280, 0.707f);
canvas->drawPath(path, p);
}
private:
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new StrokesGM; )
DEF_GM( return new Strokes2GM; )
DEF_GM( return new Strokes3GM; )
DEF_GM( return new Strokes4GM; )
DEF_GM( return new Strokes5GM; )
DEF_GM( return new ZeroLenStrokesGM; )
DEF_GM( return new TeenyStrokesGM; )
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