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skia2/gm/cubicpaths.cpp
Hal Canary fa3305ae3f gm: add some overrides 
Change-Id: I5348e2da1a2034b629d43b9e9faadb6db333abe8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228348
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2019-07-24 19:11:35 +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/SkFont.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.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/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/utils/SkRandom.h"
#include "tools/ToolUtils.h"
// https://bug.skia.org/1316 shows that this cubic, when slightly clipped, creates big
// (incorrect) changes to its control points.
class ClippedCubicGM : public skiagm::GM {
SkString onShortName() override { return SkString("clippedcubic"); }
SkISize onISize() override { return {1240, 390}; }
virtual void onDraw(SkCanvas* canvas) override {
SkPath path;
path.moveTo(0, 0);
path.cubicTo(140, 150, 40, 10, 170, 150);
SkPaint paint;
SkRect bounds = path.getBounds();
for (SkScalar dy = -1; dy <= 1; dy += 1) {
canvas->save();
for (SkScalar dx = -1; dx <= 1; dx += 1) {
canvas->save();
canvas->clipRect(bounds);
canvas->translate(dx, dy);
canvas->drawPath(path, paint);
canvas->restore();
canvas->translate(bounds.width(), 0);
}
canvas->restore();
canvas->translate(0, bounds.height());
}
}
};
class ClippedCubic2GM : public skiagm::GM {
SkString onShortName() override { return SkString("clippedcubic2"); }
SkISize onISize() override { return {1240, 390}; }
void onDraw(SkCanvas* canvas) override {
canvas->save();
canvas->translate(-2, 120);
drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 80, 150));
canvas->translate(0, 170);
drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 80, 100));
canvas->translate(0, 170);
drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 30, 150));
canvas->translate(0, 170);
drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 10, 150));
canvas->restore();
canvas->save();
canvas->translate(20, -2);
drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 80));
canvas->translate(170, 0);
drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 100, 80));
canvas->translate(170, 0);
drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 30));
canvas->translate(170, 0);
drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 10));
canvas->restore();
}
void drawOne(SkCanvas* canvas, const SkPath& path, const SkRect& clip) {
SkPaint framePaint, fillPaint;
framePaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(clip, framePaint);
canvas->drawPath(path, framePaint);
canvas->save();
canvas->clipRect(clip);
canvas->drawPath(path, fillPaint);
canvas->restore();
}
void onOnceBeforeDraw() override {
fPath.moveTo(69.7030518991886f, 0);
fPath.cubicTo( 69.7030518991886f, 21.831149999999997f,
58.08369508178456f, 43.66448333333333f, 34.8449814469765f, 65.5f);
fPath.cubicTo( 11.608591683531916f, 87.33115f, -0.010765133872116195f, 109.16448333333332f,
-0.013089005235602302f, 131);
fPath.close();
fFlipped = fPath;
SkMatrix matrix;
matrix.reset();
matrix.setScaleX(0);
matrix.setScaleY(0);
matrix.setSkewX(1);
matrix.setSkewY(1);
fFlipped.transform(matrix);
}
SkPath fPath;
SkPath fFlipped;
private:
typedef skiagm::GM INHERITED;
};
class CubicPathGM : public skiagm::GM {
SkString onShortName() override { return SkString("cubicpath"); }
SkISize onISize() override { return {1240, 390}; }
void drawPath(SkPath& path,SkCanvas* canvas,SkColor color,
const SkRect& clip,SkPaint::Cap cap, SkPaint::Join join,
SkPaint::Style style, SkPath::FillType fill,
SkScalar strokeWidth) {
path.setFillType(fill);
SkPaint paint;
paint.setStrokeCap(cap);
paint.setStrokeWidth(strokeWidth);
paint.setStrokeJoin(join);
paint.setColor(color);
paint.setStyle(style);
canvas->save();
canvas->clipRect(clip);
canvas->drawPath(path, paint);
canvas->restore();
}
void onDraw(SkCanvas* canvas) override {
struct FillAndName {
SkPath::FillType fFill;
const char* fName;
};
constexpr FillAndName gFills[] = {
{SkPath::kWinding_FillType, "Winding"},
{SkPath::kEvenOdd_FillType, "Even / Odd"},
{SkPath::kInverseWinding_FillType, "Inverse Winding"},
{SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"},
};
struct StyleAndName {
SkPaint::Style fStyle;
const char* fName;
};
constexpr StyleAndName gStyles[] = {
{SkPaint::kFill_Style, "Fill"},
{SkPaint::kStroke_Style, "Stroke"},
{SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
};
struct CapAndName {
SkPaint::Cap fCap;
SkPaint::Join fJoin;
const char* fName;
};
constexpr CapAndName gCaps[] = {
{SkPaint::kButt_Cap, SkPaint::kBevel_Join, "Butt"},
{SkPaint::kRound_Cap, SkPaint::kRound_Join, "Round"},
{SkPaint::kSquare_Cap, SkPaint::kBevel_Join, "Square"}
};
struct PathAndName {
SkPath fPath;
const char* fName;
};
PathAndName path;
path.fPath.moveTo(25*SK_Scalar1, 10*SK_Scalar1);
path.fPath.cubicTo(40*SK_Scalar1, 20*SK_Scalar1,
60*SK_Scalar1, 20*SK_Scalar1,
75*SK_Scalar1, 10*SK_Scalar1);
path.fName = "moveTo-cubic";
SkPaint titlePaint;
titlePaint.setColor(SK_ColorBLACK);
titlePaint.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface(), 15);
const char title[] = "Cubic Drawn Into Rectangle Clips With "
"Indicated Style, Fill and Linecaps, with stroke width 10";
canvas->drawString(title, 20, 20, font, titlePaint);
SkRandom rand;
SkRect rect = SkRect::MakeWH(100*SK_Scalar1, 30*SK_Scalar1);
canvas->save();
canvas->translate(10 * SK_Scalar1, 30 * SK_Scalar1);
canvas->save();
for (size_t cap = 0; cap < SK_ARRAY_COUNT(gCaps); ++cap) {
if (0 < cap) {
canvas->translate((rect.width() + 40 * SK_Scalar1) * SK_ARRAY_COUNT(gStyles), 0);
}
canvas->save();
for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
if (0 < fill) {
canvas->translate(0, rect.height() + 40 * SK_Scalar1);
}
canvas->save();
for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
if (0 < style) {
canvas->translate(rect.width() + 40 * SK_Scalar1, 0);
}
SkColor color = 0xff007000;
this->drawPath(path.fPath, canvas, color, rect,
gCaps[cap].fCap, gCaps[cap].fJoin, gStyles[style].fStyle,
gFills[fill].fFill, SK_Scalar1*10);
SkPaint rectPaint;
rectPaint.setColor(SK_ColorBLACK);
rectPaint.setStyle(SkPaint::kStroke_Style);
rectPaint.setStrokeWidth(-1);
rectPaint.setAntiAlias(true);
canvas->drawRect(rect, rectPaint);
SkPaint labelPaint;
labelPaint.setColor(color);
font.setSize(10);
canvas->drawString(gStyles[style].fName, 0, rect.height() + 12, font, labelPaint);
canvas->drawString(gFills[fill].fName, 0, rect.height() + 24, font, labelPaint);
canvas->drawString(gCaps[cap].fName, 0, rect.height() + 36, font, labelPaint);
}
canvas->restore();
}
canvas->restore();
}
canvas->restore();
canvas->restore();
}
};
class CubicClosePathGM : public skiagm::GM {
SkString onShortName() override { return SkString("cubicclosepath"); }
SkISize onISize() override { return {1240, 390}; }
void drawPath(SkPath& path,SkCanvas* canvas,SkColor color,
const SkRect& clip,SkPaint::Cap cap, SkPaint::Join join,
SkPaint::Style style, SkPath::FillType fill,
SkScalar strokeWidth) {
path.setFillType(fill);
SkPaint paint;
paint.setStrokeCap(cap);
paint.setStrokeWidth(strokeWidth);
paint.setStrokeJoin(join);
paint.setColor(color);
paint.setStyle(style);
canvas->save();
canvas->clipRect(clip);
canvas->drawPath(path, paint);
canvas->restore();
}
virtual void onDraw(SkCanvas* canvas) override {
struct FillAndName {
SkPath::FillType fFill;
const char* fName;
};
constexpr FillAndName gFills[] = {
{SkPath::kWinding_FillType, "Winding"},
{SkPath::kEvenOdd_FillType, "Even / Odd"},
{SkPath::kInverseWinding_FillType, "Inverse Winding"},
{SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"},
};
struct StyleAndName {
SkPaint::Style fStyle;
const char* fName;
};
constexpr StyleAndName gStyles[] = {
{SkPaint::kFill_Style, "Fill"},
{SkPaint::kStroke_Style, "Stroke"},
{SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
};
struct CapAndName {
SkPaint::Cap fCap;
SkPaint::Join fJoin;
const char* fName;
};
constexpr CapAndName gCaps[] = {
{SkPaint::kButt_Cap, SkPaint::kBevel_Join, "Butt"},
{SkPaint::kRound_Cap, SkPaint::kRound_Join, "Round"},
{SkPaint::kSquare_Cap, SkPaint::kBevel_Join, "Square"}
};
struct PathAndName {
SkPath fPath;
const char* fName;
};
PathAndName path;
path.fPath.moveTo(25*SK_Scalar1, 10*SK_Scalar1);
path.fPath.cubicTo(40*SK_Scalar1, 20*SK_Scalar1,
60*SK_Scalar1, 20*SK_Scalar1,
75*SK_Scalar1, 10*SK_Scalar1);
path.fPath.close();
path.fName = "moveTo-cubic-close";
SkPaint titlePaint;
titlePaint.setColor(SK_ColorBLACK);
titlePaint.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface(), 15);
const char title[] = "Cubic Closed Drawn Into Rectangle Clips With "
"Indicated Style, Fill and Linecaps, with stroke width 10";
canvas->drawString(title, 20, 20, font, titlePaint);
SkRandom rand;
SkRect rect = SkRect::MakeWH(100*SK_Scalar1, 30*SK_Scalar1);
canvas->save();
canvas->translate(10 * SK_Scalar1, 30 * SK_Scalar1);
canvas->save();
for (size_t cap = 0; cap < SK_ARRAY_COUNT(gCaps); ++cap) {
if (0 < cap) {
canvas->translate((rect.width() + 40 * SK_Scalar1) * SK_ARRAY_COUNT(gStyles), 0);
}
canvas->save();
for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
if (0 < fill) {
canvas->translate(0, rect.height() + 40 * SK_Scalar1);
}
canvas->save();
for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
if (0 < style) {
canvas->translate(rect.width() + 40 * SK_Scalar1, 0);
}
SkColor color = 0xff007000;
this->drawPath(path.fPath, canvas, color, rect,
gCaps[cap].fCap, gCaps[cap].fJoin, gStyles[style].fStyle,
gFills[fill].fFill, SK_Scalar1*10);
SkPaint rectPaint;
rectPaint.setColor(SK_ColorBLACK);
rectPaint.setStyle(SkPaint::kStroke_Style);
rectPaint.setStrokeWidth(-1);
rectPaint.setAntiAlias(true);
canvas->drawRect(rect, rectPaint);
SkPaint labelPaint;
labelPaint.setColor(color);
labelPaint.setAntiAlias(true);
font.setSize(10);
canvas->drawString(gStyles[style].fName, 0, rect.height() + 12, font, labelPaint);
canvas->drawString(gFills[fill].fName, 0, rect.height() + 24, font, labelPaint);
canvas->drawString(gCaps[cap].fName, 0, rect.height() + 36, font, labelPaint);
}
canvas->restore();
}
canvas->restore();
}
canvas->restore();
canvas->restore();
}
};
DEF_SIMPLE_GM(bug5099, canvas, 50, 50) {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(10);
SkPath path;
path.moveTo(6, 27);
path.cubicTo(31.5f, 1.5f, 3.5f, 4.5f, 29, 29);
canvas->drawPath(path, p);
}
DEF_SIMPLE_GM(bug6083, canvas, 100, 50) {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(15);
canvas->translate(-500, -130);
SkPath path;
path.moveTo(500.988f, 155.200f);
path.lineTo(526.109f, 155.200f);
SkPoint p1 = { 526.109f, 155.200f };
SkPoint p2 = { 525.968f, 212.968f };
SkPoint p3 = { 526.109f, 241.840f };
path.cubicTo(p1, p2, p3);
canvas->drawPath(path, p);
canvas->translate(50, 0);
path.reset();
p2.set(525.968f, 213.172f);
path.moveTo(500.988f, 155.200f);
path.lineTo(526.109f, 155.200f);
path.cubicTo(p1, p2, p3);
canvas->drawPath(path, p);
}
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new CubicPathGM; )
DEF_GM( return new CubicClosePathGM; )
DEF_GM( return new ClippedCubicGM; )
DEF_GM( return new ClippedCubic2GM; )
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