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skia2/gm/strokes.cpp
Tyler Denniston bdc412f149 Revert "Reland "Omit inner join geometry when possible"" 
This reverts commit 44edd1952a.

Reason for revert: problematic gold diffs (e.g. paths-data-10-t) and androit CTS failures

Original change's description:
> Reland "Omit inner join geometry when possible"
>
> This is a reland of 1b0a95e0ee
>
> Original change's description:
> > Omit inner join geometry when possible
> >
> > There is some relatively cheap math we can do to determine easy cases
> > when the inner join geometry can be skipped. This CL is not
> > comprehensive in that there may be other cases where we can skip the
> > geometry.
> >
> > Only handling miter joins in this CL - the other join types can likely
> > have similar logic, but will require a bit more computation to compute
> > the inner (reflected) miter point.
> >
> > Misc notes:
> > - Added SK_LEGACY_INNER_JOINS ifdef in the event that clients depend on
> >   the old behavior.
> > - Modified stroker to track "previous previous" point, which is the
> >   start point of the previous line segment.
> >
> > Bug: b/165379671, skia:11964
> > Change-Id: I56789e85a2b4627c32f2a30fe60e47d448e9adf3
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/404717
> > Reviewed-by: Mike Reed <reed@google.com>
> > Commit-Queue: Tyler Denniston <tdenniston@google.com>
>
> Bug: b/165379671, skia:11964
> Change-Id: If8bf183db9379d0a98a6f88e70f871a559692a60
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/423821
> Reviewed-by: Tyler Denniston <tdenniston@google.com>
> Commit-Queue: Tyler Denniston <tdenniston@google.com>

TBR=reed@google.com,tdenniston@google.com

Change-Id: I5a2dfd402269db6c788f0e0625f67e9bf3b1f5cf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/165379671, skia:11964
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/426059
Reviewed-by: Tyler Denniston <tdenniston@google.com>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
2021-07-08 22:14:00 +00:00

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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/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPathEffect.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkDashPathEffect.h"
#include "include/private/SkFloatBits.h"
#include "include/utils/SkParsePath.h"
#include "include/utils/SkRandom.h"
#include "tools/ToolUtils.h"
#include <string.h>
#define W 400
#define H 400
#define N 50
constexpr SkScalar SW = SkIntToScalar(W);
constexpr 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->setXYWH(x, y, w, h);
r->offset(-w/2 + woffset, -h/2 + hoffset);
paint->setColor(rand.nextU());
paint->setAlphaf(1.0f);
}
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:
using INHERITED = skiagm::GM;
};
/* 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.setAlphaf(1.0f);
strokePaint.setAlphaf(1.0f);
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::Make(intervals, 2, 0));
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.setAlphaf(0.5f);
canvas->translate(0, 50);
canvas->drawPath(fMoveHfPath, strokePaint);
canvas->translate(0, 30);
canvas->drawPath(fMoveZfPath, strokePaint);
canvas->translate(0, 30);
fillPaint.setAlphaf(0.5f);
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:
using INHERITED = skiagm::GM;
};
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:
using INHERITED = skiagm::GM;
};
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);
}
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);
canvas->rotate(SkIntToScalar(15), SW/2, SH/2);
canvas->drawPath(fPath, paint);
}
}
}
private:
using INHERITED = skiagm::GM;
};
//////////////////////////////////////////////////////////////////////////////
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, SkPathDirection::kCW);
path->addRect(inset(bounds), SkPathDirection::kCW);
title->set("CW CW");
}
static void make1(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPathDirection::kCW);
path->addRect(inset(bounds), SkPathDirection::kCCW);
title->set("CW CCW");
}
static void make2(SkPath* path, const SkRect& bounds, SkString* title) {
path->addOval(bounds, SkPathDirection::kCW);
path->addOval(inset(bounds), SkPathDirection::kCW);
title->set("CW CW");
}
static void make3(SkPath* path, const SkRect& bounds, SkString* title) {
path->addOval(bounds, SkPathDirection::kCW);
path->addOval(inset(bounds), SkPathDirection::kCCW);
title->set("CW CCW");
}
static void make4(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPathDirection::kCW);
SkRect r = bounds;
r.inset(bounds.width() / 10, -bounds.height() / 10);
path->addOval(r, SkPathDirection::kCW);
title->set("CW CW");
}
static void make5(SkPath* path, const SkRect& bounds, SkString* title) {
path->addRect(bounds, SkPathDirection::kCW);
SkRect r = bounds;
r.inset(bounds.width() / 10, -bounds.height() / 10);
path->addOval(r, SkPathDirection::kCCW);
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(ToolUtils::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:
using INHERITED = skiagm::GM;
};
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:
using INHERITED = skiagm::GM;
};
// 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:
using INHERITED = skiagm::GM;
};
//////////////////////////////////////////////////////////////////////////////
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; )
DEF_SIMPLE_GM(zerolinedash, canvas, 256, 256) {
canvas->clear(SK_ColorWHITE);
SkPaint paint;
paint.setColor(SkColorSetARGB(255, 0, 0, 0));
paint.setStrokeWidth(11);
paint.setStrokeCap(SkPaint::kRound_Cap);
paint.setStrokeJoin(SkPaint::kBevel_Join);
SkScalar dash_pattern[] = {1, 5};
paint.setPathEffect(SkDashPathEffect::Make(dash_pattern, 2, 0));
canvas->drawLine(100, 100, 100, 100, paint);
}
#ifdef PDF_IS_FIXED_SO_THIS_DOESNT_BREAK_IT
DEF_SIMPLE_GM(longrect_dash, canvas, 250, 250) {
canvas->clear(SK_ColorWHITE);
SkPaint paint;
paint.setColor(SkColorSetARGB(255, 0, 0, 0));
paint.setStrokeWidth(5);
paint.setStrokeCap(SkPaint::kRound_Cap);
paint.setStrokeJoin(SkPaint::kBevel_Join);
paint.setStyle(SkPaint::kStroke_Style);
SkScalar dash_pattern[] = {1, 5};
paint.setPathEffect(SkDashPathEffect::Make(dash_pattern, 2, 0));
// try all combinations of stretching bounds
for (auto left : { 20.f, -100001.f } ) {
for (auto top : { 20.f, -100001.f } ) {
for (auto right : { 40.f, 100001.f } ) {
for (auto bottom : { 40.f, 100001.f } ) {
canvas->save();
canvas->clipRect({10, 10, 50, 50});
canvas->drawRect({left, top, right, bottom}, paint);
canvas->restore();
canvas->translate(60, 0);
}
}
canvas->translate(-60 * 4, 60);
}
}
}
#endif
DEF_SIMPLE_GM(inner_join_geometry, canvas, 1000, 700) {
// These paths trigger cases where we must add inner join geometry.
// skbug.com/11964
const SkPoint pathPoints[] = {
/*moveTo*/ /*lineTo*/ /*lineTo*/
{119, 71}, {129, 151}, {230, 24},
{200, 144}, {129, 151}, {230, 24},
{192, 176}, {224, 175}, {281, 103},
{233, 205}, {224, 175}, {281, 103},
{121, 216}, {234, 189}, {195, 147},
{141, 216}, {254, 189}, {238, 250},
{159, 202}, {269, 197}, {289, 165},
{159, 202}, {269, 197}, {287, 227},
};
SkPaint pathPaint;
pathPaint.setStroke(true);
pathPaint.setAntiAlias(true);
pathPaint.setStrokeWidth(100);
SkPaint skeletonPaint;
skeletonPaint.setStroke(true);
skeletonPaint.setAntiAlias(true);
skeletonPaint.setStrokeWidth(0);
skeletonPaint.setColor(SK_ColorRED);
canvas->translate(0, 50);
for (size_t i = 0; i < SK_ARRAY_COUNT(pathPoints) / 3; i++) {
auto path = SkPath::Polygon(pathPoints + i * 3, 3, false);
canvas->drawPath(path, pathPaint);
SkPath fillPath;
pathPaint.getFillPath(path, &fillPath);
canvas->drawPath(fillPath, skeletonPaint);
canvas->translate(200, 0);
if ((i + 1) % 4 == 0) {
canvas->translate(-800, 200);
}
}
}
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