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skia2/gm/convex_all_line_paths.cpp

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/*
* Copyright 2015 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 "SkPathPriv.h"
static void create_ngon(int n, SkPoint* pts, SkScalar width, SkScalar height) {
float angleStep = 360.0f / n, angle = 0.0f, sin, cos;
if ((n % 2) == 1) {
angle = angleStep/2.0f;
}
for (int i = 0; i < n; ++i) {
sin = SkScalarSinCos(SkDegreesToRadians(angle), &cos);
pts[i].fX = -sin * width;
pts[i].fY = cos * height;
angle += angleStep;
}
}
namespace skiagm {
// This GM is intended to exercise Ganesh's handling of convex line-only
// paths
class ConvexLineOnlyPathsGM : public GM {
public:
ConvexLineOnlyPathsGM() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override { return SkString("convex-lineonly-paths"); }
SkISize onISize() override { return SkISize::Make(kGMWidth, kGMHeight); }
bool runAsBench() const override { return true; }
static SkPath GetPath(int index, int offset, SkPath::Direction dir) {
// narrow rect
const SkPoint gPoints0[] = {
{ -1.5f, -50.0f },
{ 1.5f, -50.0f },
{ 1.5f, 50.0f },
{ -1.5f, 50.0f }
};
// narrow rect on an angle
const SkPoint gPoints1[] = {
{ -50.0f, -49.0f },
{ -49.0f, -50.0f },
{ 50.0f, 49.0f },
{ 49.0f, 50.0f }
};
// trap - narrow on top - wide on bottom
const SkPoint gPoints2[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 50.0f, 50.0f },
{ -50.0f, 50.0f }
};
// wide skewed rect
const SkPoint gPoints3[] = {
{ -50.0f, -50.0f },
{ 0.0f, -50.0f },
{ 50.0f, 50.0f },
{ 0.0f, 50.0f }
};
// thin rect with colinear-ish lines
const SkPoint gPoints4[] = {
{ -6.0f, -50.0f },
{ 4.0f, -50.0f },
{ 5.0f, -25.0f },
{ 6.0f, 0.0f },
{ 5.0f, 25.0f },
{ 4.0f, 50.0f },
{ -4.0f, 50.0f }
};
// degenerate
const SkPoint gPoints5[] = {
{ -0.025f, -0.025f },
{ 0.025f, -0.025f },
{ 0.025f, 0.025f },
{ -0.025f, 0.025f }
};
// Triangle in which the first point should fuse with last
const SkPoint gPoints6[] = {
{ -20.0f, -13.0f },
{ -20.0f, -13.05f },
{ 20.0f, -13.0f },
{ 20.0f, 27.0f }
};
// thin rect with colinear lines
const SkPoint gPoints7[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 10.0f, -25.0f },
{ 10.0f, 0.0f },
{ 10.0f, 25.0f },
{ 10.0f, 50.0f },
{ -10.0f, 50.0f }
};
// capped teardrop
const SkPoint gPoints8[] = {
{ 50.00f, 50.00f },
{ 0.00f, 50.00f },
{ -15.45f, 47.55f },
{ -29.39f, 40.45f },
{ -40.45f, 29.39f },
{ -47.55f, 15.45f },
{ -50.00f, 0.00f },
{ -47.55f, -15.45f },
{ -40.45f, -29.39f },
{ -29.39f, -40.45f },
{ -15.45f, -47.55f },
{ 0.00f, -50.00f },
{ 50.00f, -50.00f }
};
// teardrop
const SkPoint gPoints9[] = {
{ 4.39f, 40.45f },
{ -9.55f, 47.55f },
{ -25.00f, 50.00f },
{ -40.45f, 47.55f },
{ -54.39f, 40.45f },
{ -65.45f, 29.39f },
{ -72.55f, 15.45f },
{ -75.00f, 0.00f },
{ -72.55f, -15.45f },
{ -65.45f, -29.39f },
{ -54.39f, -40.45f },
{ -40.45f, -47.55f },
{ -25.0f, -50.0f },
{ -9.55f, -47.55f },
{ 4.39f, -40.45f },
{ 75.00f, 0.00f }
};
// clipped triangle
const SkPoint gPoints10[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 50.0f, 31.0f },
{ 40.0f, 50.0f },
{ -40.0f, 50.0f },
{ -50.0f, 31.0f },
};
const SkPoint* gPoints[] = {
gPoints0, gPoints1, gPoints2, gPoints3, gPoints4, gPoints5, gPoints6,
gPoints7, gPoints8, gPoints9, gPoints10,
};
const size_t gSizes[] = {
SK_ARRAY_COUNT(gPoints0),
SK_ARRAY_COUNT(gPoints1),
SK_ARRAY_COUNT(gPoints2),
SK_ARRAY_COUNT(gPoints3),
SK_ARRAY_COUNT(gPoints4),
SK_ARRAY_COUNT(gPoints5),
SK_ARRAY_COUNT(gPoints6),
SK_ARRAY_COUNT(gPoints7),
SK_ARRAY_COUNT(gPoints8),
SK_ARRAY_COUNT(gPoints9),
SK_ARRAY_COUNT(gPoints10),
};
static_assert(SK_ARRAY_COUNT(gSizes) == SK_ARRAY_COUNT(gPoints), "array_mismatch");
SkAutoTDeleteArray<SkPoint> data(nullptr);
const SkPoint* points;
int numPts;
if (index < (int) SK_ARRAY_COUNT(gPoints)) {
// manually specified
points = gPoints[index];
numPts = (int) gSizes[index];
} else {
// procedurally generated
SkScalar width = kMaxPathHeight/2;
SkScalar height = kMaxPathHeight/2;
switch (index-SK_ARRAY_COUNT(gPoints)) {
case 0:
numPts = 3;
break;
case 1:
numPts = 4;
break;
case 2:
numPts = 5;
break;
case 3: // squashed pentagon
numPts = 5;
width = kMaxPathHeight/5;
break;
case 4:
numPts = 6;
break;
case 5:
numPts = 8;
break;
case 6: // squashed octogon
numPts = 8;
width = kMaxPathHeight/5;
break;
case 7:
numPts = 20;
break;
case 8:
numPts = 100;
break;
default:
numPts = 3;
break;
}
data.reset(new SkPoint[numPts]);
create_ngon(numPts, data.get(), width, height);
points = data.get();
}
SkPath path;
if (SkPath::kCW_Direction == dir) {
path.moveTo(points[0]);
for (int i = 1; i < numPts; ++i) {
path.lineTo(points[i]);
}
} else {
path.moveTo(points[numPts-1]);
for (int i = numPts-2; i >= 0; --i) {
path.lineTo(points[i]);
}
}
path.close();
#ifdef SK_DEBUG
// Each path this method returns should be convex, only composed of
// lines, wound the right direction, and short enough to fit in one
// of the GMs rows.
SkASSERT(path.isConvex());
SkASSERT(SkPath::kLine_SegmentMask == path.getSegmentMasks());
SkPathPriv::FirstDirection actualDir;
SkASSERT(SkPathPriv::CheapComputeFirstDirection(path, &actualDir));
SkASSERT(SkPathPriv::AsFirstDirection(dir) == actualDir);
SkRect bounds = path.getBounds();
SkASSERT(SkScalarNearlyEqual(bounds.centerX(), 0.0f));
SkASSERT(bounds.height() <= kMaxPathHeight);
#endif
return path;
}
// Draw a single path several times, shrinking it, flipping its direction
// and changing its start vertex each time.
void drawPath(SkCanvas* canvas, int index, SkPoint* offset) {
SkPoint center;
{
SkPath path = GetPath(index, 0, SkPath::kCW_Direction);
if (offset->fX+path.getBounds().width() > kGMWidth) {
offset->fX = 0;
offset->fY += kMaxPathHeight;
}
center = { offset->fX + SkScalarHalf(path.getBounds().width()), offset->fY};
offset->fX += path.getBounds().width();
}
const SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
const SkPath::Direction dirs[2] = { SkPath::kCW_Direction, SkPath::kCCW_Direction };
const float scales[] = { 1.0f, 0.75f, 0.5f, 0.25f, 0.1f, 0.01f, 0.001f };
SkPaint paint;
paint.setAntiAlias(true);
for (size_t i = 0; i < SK_ARRAY_COUNT(scales); ++i) {
SkPath path = GetPath(index, (int) i, dirs[i%2]);
canvas->save();
canvas->translate(center.fX, center.fY);
canvas->scale(scales[i], scales[i]);
paint.setColor(colors[i%2]);
canvas->drawPath(path, paint);
canvas->restore();
}
}
void onDraw(SkCanvas* canvas) override {
// the right edge of the last drawn path
SkPoint offset = { 0, SkScalarHalf(kMaxPathHeight) };
for (int i = 0; i < kNumPaths; ++i) {
this->drawPath(canvas, i, &offset);
}
// Repro for crbug.com/472723 (Missing AA on portions of graphic with GPU rasterization)
{
canvas->translate(356.0f, 50.0f);
SkPaint p;
p.setAntiAlias(true);
SkPath p1;
p1.moveTo(60.8522949f, 364.671021f);
p1.lineTo(59.4380493f, 364.671021f);
p1.lineTo(385.414276f, 690.647217f);
p1.lineTo(386.121399f, 689.940125f);
canvas->drawPath(p1, p);
}
}
private:
static const int kNumPaths = 20;
static const int kMaxPathHeight = 100;
static const int kGMWidth = 512;
static const int kGMHeight = 512;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new ConvexLineOnlyPathsGM;)
}
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