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skia2/gm/degeneratesegments.cpp
Mike Reed 92f6eb1602 use pathbuilder 
Change-Id: I2bca419a3273a9cc8a984b0f4159f518968c6652
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313077
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2020-08-25 16:29:48 +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/SkPaint.h"
#include "include/core/SkPathBuilder.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"
namespace skiagm {
class DegenerateSegmentsGM : public GM {
struct PathAndName {
SkPath fPath;
const char* fName1;
const char* fName2;
};
SkString onShortName() override { return SkString("degeneratesegments"); }
SkISize onISize() override { return {896, 930}; }
typedef SkPoint (*AddSegmentFunc)(SkPathBuilder&, SkPoint&);
// We need to use explicit commands here, instead of addPath, because we
// do not want the moveTo that is added at the beginning of a path to
// appear in the appended path.
static SkPoint AddMove(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
return moveToPt;
}
static SkPoint AddMoveClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.close();
return moveToPt;
}
static SkPoint AddDegenLine(SkPathBuilder& path, SkPoint& startPt) {
path.lineTo(startPt);
return startPt;
}
static SkPoint AddMoveDegenLine(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.lineTo(moveToPt);
return moveToPt;
}
static SkPoint AddMoveDegenLineClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.lineTo(moveToPt);
path.close();
return moveToPt;
}
static SkPoint AddDegenQuad(SkPathBuilder& path, SkPoint& startPt) {
path.quadTo(startPt, startPt);
return startPt;
}
static SkPoint AddMoveDegenQuad(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.quadTo(moveToPt, moveToPt);
return moveToPt;
}
static SkPoint AddMoveDegenQuadClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.quadTo(moveToPt, moveToPt);
path.close();
return moveToPt;
}
static SkPoint AddDegenCubic(SkPathBuilder& path, SkPoint& startPt) {
path.cubicTo(startPt, startPt, startPt);
return startPt;
}
static SkPoint AddMoveDegenCubic(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.cubicTo(moveToPt, moveToPt, moveToPt);
return moveToPt;
}
static SkPoint AddMoveDegenCubicClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
path.moveTo(moveToPt);
path.cubicTo(moveToPt, moveToPt, moveToPt);
path.close();
return moveToPt;
}
static SkPoint AddClose(SkPathBuilder& path, SkPoint& startPt) {
path.close();
return startPt;
}
static SkPoint AddLine(SkPathBuilder& path, SkPoint& startPt) {
SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
path.lineTo(endPt);
return endPt;
}
static SkPoint AddMoveLine(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.lineTo(endPt);
return endPt;
}
static SkPoint AddMoveLineClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.lineTo(endPt);
path.close();
return endPt;
}
static SkPoint AddQuad(SkPathBuilder& path, SkPoint& startPt) {
SkPoint midPt = startPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
path.quadTo(midPt, endPt);
return endPt;
}
static SkPoint AddMoveQuad(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint midPt = moveToPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.quadTo(midPt, endPt);
return endPt;
}
static SkPoint AddMoveQuadClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint midPt = moveToPt + SkPoint::Make(20*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.quadTo(midPt, endPt);
path.close();
return endPt;
}
static SkPoint AddCubic(SkPathBuilder& path, SkPoint& startPt) {
SkPoint t1Pt = startPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
SkPoint t2Pt = startPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
path.cubicTo(t1Pt, t2Pt, endPt);
return endPt;
}
static SkPoint AddMoveCubic(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint t1Pt = moveToPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
SkPoint t2Pt = moveToPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.cubicTo(t1Pt, t2Pt, endPt);
return endPt;
}
static SkPoint AddMoveCubicClose(SkPathBuilder& path, SkPoint& startPt) {
SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
SkPoint t1Pt = moveToPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
SkPoint t2Pt = moveToPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
SkPoint endPt = moveToPt + SkPoint::Make(40*SK_Scalar1, 0);
path.moveTo(moveToPt);
path.cubicTo(t1Pt, t2Pt, endPt);
path.close();
return endPt;
}
void drawPath(SkPath path, SkCanvas* canvas, SkColor color,
const SkRect& clip, SkPaint::Cap cap, SkPaint::Join join,
SkPaint::Style style, SkPathFillType 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 {
constexpr AddSegmentFunc gSegmentFunctions[] = {
AddMove,
AddMoveClose,
AddDegenLine,
AddMoveDegenLine,
AddMoveDegenLineClose,
AddDegenQuad,
AddMoveDegenQuad,
AddMoveDegenQuadClose,
AddDegenCubic,
AddMoveDegenCubic,
AddMoveDegenCubicClose,
AddClose,
AddLine,
AddMoveLine,
AddMoveLineClose,
AddQuad,
AddMoveQuad,
AddMoveQuadClose,
AddCubic,
AddMoveCubic,
AddMoveCubicClose
};
const char* gSegmentNames[] = {
"Move",
"MoveClose",
"DegenLine",
"MoveDegenLine",
"MoveDegenLineClose",
"DegenQuad",
"MoveDegenQuad",
"MoveDegenQuadClose",
"DegenCubic",
"MoveDegenCubic",
"MoveDegenCubicClose",
"Close",
"Line",
"MoveLine",
"MoveLineClose",
"Quad",
"MoveQuad",
"MoveQuadClose",
"Cubic",
"MoveCubic",
"MoveCubicClose"
};
struct FillAndName {
SkPathFillType fFill;
const char* fName;
};
constexpr FillAndName gFills[] = {
{SkPathFillType::kWinding, "Winding"},
{SkPathFillType::kEvenOdd, "Even / Odd"},
{SkPathFillType::kInverseWinding, "Inverse Winding"},
{SkPathFillType::kInverseEvenOdd, "Inverse Even / Odd"}
};
struct StyleAndName {
SkPaint::Style fStyle;
const char* fName;
};
constexpr StyleAndName gStyles[] = {
{SkPaint::kFill_Style, "Fill"},
{SkPaint::kStroke_Style, "Stroke 10"},
{SkPaint::kStrokeAndFill_Style, "Stroke 10 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"}
};
SkPaint titlePaint;
titlePaint.setColor(SK_ColorBLACK);
titlePaint.setAntiAlias(true);
SkFont font(ToolUtils::create_portable_typeface(), 15);
const char title[] = "Random Paths Drawn Into Rectangle Clips With "
"Indicated Style, Fill and Linecaps, "
"with Stroke width 6";
canvas->drawString(title, 20, 20, font, titlePaint);
SkRandom rand;
SkRect rect = SkRect::MakeWH(220*SK_Scalar1, 50*SK_Scalar1);
canvas->save();
canvas->translate(2*SK_Scalar1, 30 * SK_Scalar1); // The title
canvas->save();
unsigned numSegments = SK_ARRAY_COUNT(gSegmentFunctions);
unsigned numCaps = SK_ARRAY_COUNT(gCaps);
unsigned numStyles = SK_ARRAY_COUNT(gStyles);
unsigned numFills = SK_ARRAY_COUNT(gFills);
for (size_t row = 0; row < 6; ++row) {
if (0 < row) {
canvas->translate(0, rect.height() + 100*SK_Scalar1);
}
canvas->save();
for (size_t column = 0; column < 4; ++column) {
if (0 < column) {
canvas->translate(rect.width() + 4*SK_Scalar1, 0);
}
SkColor color = ToolUtils::color_to_565(0xff007000);
StyleAndName style = gStyles[(rand.nextU() >> 16) % numStyles];
CapAndName cap = gCaps[(rand.nextU() >> 16) % numCaps];
FillAndName fill = gFills[(rand.nextU() >> 16) % numFills];
unsigned s1 = (rand.nextU() >> 16) % numSegments;
unsigned s2 = (rand.nextU() >> 16) % numSegments;
unsigned s3 = (rand.nextU() >> 16) % numSegments;
unsigned s4 = (rand.nextU() >> 16) % numSegments;
unsigned s5 = (rand.nextU() >> 16) % numSegments;
SkPoint pt = SkPoint::Make(10*SK_Scalar1, 0);
SkPathBuilder path;
pt = gSegmentFunctions[s1](path, pt);
pt = gSegmentFunctions[s2](path, pt);
pt = gSegmentFunctions[s3](path, pt);
pt = gSegmentFunctions[s4](path, pt);
pt = gSegmentFunctions[s5](path, pt);
this->drawPath(path.detach(), canvas, color, rect,
cap.fCap, cap.fJoin, style.fStyle,
fill.fFill, SK_Scalar1*6);
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(style.fName, 0, rect.height() + 12, font, labelPaint);
canvas->drawString(fill.fName, 0, rect.height() + 24, font, labelPaint);
canvas->drawString(cap.fName, 0, rect.height() + 36, font, labelPaint);
canvas->drawString(gSegmentNames[s1], 0, rect.height() + 48, font, labelPaint);
canvas->drawString(gSegmentNames[s2], 0, rect.height() + 60, font, labelPaint);
canvas->drawString(gSegmentNames[s3], 0, rect.height() + 72, font, labelPaint);
canvas->drawString(gSegmentNames[s4], 0, rect.height() + 84, font, labelPaint);
canvas->drawString(gSegmentNames[s5], 0, rect.height() + 96, font, labelPaint);
}
canvas->restore();
}
canvas->restore();
canvas->restore();
}
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new DegenerateSegmentsGM; )
} // namespace skiagm
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