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skia2/gm/dashing.cpp
Brian Osman 4428f2c39f Remove SkScalarSinCos 
This differed from the separate versions in that it snapped to zero.
It was also strictly worse than calling the two separate versions.
Most clients don't need the snapping, so just call the two existing
functions. For clients that need the snapping, call new variants of
each that do snap.

Change-Id: Ia4e09fd9651932fe15caeab1399df7f6281bdc17
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205303
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2019-04-02 15:46:57 +00:00

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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkDashPathEffect.h"
#include "SkPaint.h"
#include "ToolUtils.h"
#include "gm.h"
static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint,
SkScalar finalX = SkIntToScalar(600), SkScalar finalY = SkIntToScalar(0),
SkScalar phase = SkIntToScalar(0),
SkScalar startX = SkIntToScalar(0), SkScalar startY = SkIntToScalar(0)) {
SkPaint p(paint);
const SkScalar intervals[] = {
SkIntToScalar(on),
SkIntToScalar(off),
};
p.setPathEffect(SkDashPathEffect::Make(intervals, 2, phase));
canvas->drawLine(startX, startY, finalX, finalY, p);
}
// earlier bug stopped us from drawing very long single-segment dashes, because
// SkPathMeasure was skipping very small delta-T values (nearlyzero). This is
// now fixes, so this giant dash should appear.
static void show_giant_dash(SkCanvas* canvas) {
SkPaint paint;
drawline(canvas, 1, 1, paint, SkIntToScalar(20 * 1000));
}
static void show_zero_len_dash(SkCanvas* canvas) {
SkPaint paint;
drawline(canvas, 2, 2, paint, SkIntToScalar(0));
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(2));
canvas->translate(0, SkIntToScalar(20));
drawline(canvas, 4, 4, paint, SkIntToScalar(0));
}
class DashingGM : public skiagm::GM {
public:
DashingGM() {}
protected:
SkString onShortName() {
return SkString("dashing");
}
SkISize onISize() { return SkISize::Make(640, 340); }
virtual void onDraw(SkCanvas* canvas) {
constexpr struct {
int fOnInterval;
int fOffInterval;
} gData[] = {
{ 1, 1 },
{ 4, 1 },
};
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
canvas->translate(0, SK_ScalarHalf);
for (int width = 0; width <= 2; ++width) {
for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
for (int aa = 0; aa <= 1; ++aa) {
int w = width * width * width;
paint.setAntiAlias(SkToBool(aa));
paint.setStrokeWidth(SkIntToScalar(w));
int scale = w ? w : 1;
drawline(canvas, gData[data].fOnInterval * scale,
gData[data].fOffInterval * scale,
paint);
canvas->translate(0, SkIntToScalar(20));
}
}
}
show_giant_dash(canvas);
canvas->translate(0, SkIntToScalar(20));
show_zero_len_dash(canvas);
canvas->translate(0, SkIntToScalar(20));
// Draw 0 on, 0 off dashed line
paint.setStrokeWidth(SkIntToScalar(8));
drawline(canvas, 0, 0, paint);
}
};
///////////////////////////////////////////////////////////////////////////////
static void make_unit_star(SkPath* path, int n) {
SkScalar rad = -SK_ScalarPI / 2;
const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
path->moveTo(0, -SK_Scalar1);
for (int i = 1; i < n; i++) {
rad += drad;
path->lineTo(SkScalarCos(rad), SkScalarSin(rad));
}
path->close();
}
static void make_path_line(SkPath* path, const SkRect& bounds) {
path->moveTo(bounds.left(), bounds.top());
path->lineTo(bounds.right(), bounds.bottom());
}
static void make_path_rect(SkPath* path, const SkRect& bounds) {
path->addRect(bounds);
}
static void make_path_oval(SkPath* path, const SkRect& bounds) {
path->addOval(bounds);
}
static void make_path_star(SkPath* path, const SkRect& bounds) {
make_unit_star(path, 5);
SkMatrix matrix;
matrix.setRectToRect(path->getBounds(), bounds, SkMatrix::kCenter_ScaleToFit);
path->transform(matrix);
}
class Dashing2GM : public skiagm::GM {
public:
Dashing2GM() {}
protected:
SkString onShortName() {
return SkString("dashing2");
}
SkISize onISize() { return SkISize::Make(640, 480); }
virtual void onDraw(SkCanvas* canvas) {
constexpr int gIntervals[] = {
3, // 3 dashes: each count [0] followed by intervals [1..count]
2, 10, 10,
4, 20, 5, 5, 5,
2, 2, 2
};
void (*gProc[])(SkPath*, const SkRect&) = {
make_path_line, make_path_rect, make_path_oval, make_path_star,
};
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(6));
SkRect bounds = SkRect::MakeWH(SkIntToScalar(120), SkIntToScalar(120));
bounds.offset(SkIntToScalar(20), SkIntToScalar(20));
SkScalar dx = bounds.width() * 4 / 3;
SkScalar dy = bounds.height() * 4 / 3;
const int* intervals = &gIntervals[1];
for (int y = 0; y < gIntervals[0]; ++y) {
SkScalar vals[SK_ARRAY_COUNT(gIntervals)]; // more than enough
int count = *intervals++;
for (int i = 0; i < count; ++i) {
vals[i] = SkIntToScalar(*intervals++);
}
SkScalar phase = vals[0] / 2;
paint.setPathEffect(SkDashPathEffect::Make(vals, count, phase));
for (size_t x = 0; x < SK_ARRAY_COUNT(gProc); ++x) {
SkPath path;
SkRect r = bounds;
r.offset(x * dx, y * dy);
gProc[x](&path, r);
canvas->drawPath(path, paint);
}
}
}
};
//////////////////////////////////////////////////////////////////////////////
// Test out the on/off line dashing Chrome if fond of
class Dashing3GM : public skiagm::GM {
public:
Dashing3GM() {}
protected:
SkString onShortName() {
return SkString("dashing3");
}
SkISize onISize() { return SkISize::Make(640, 480); }
// Draw a 100x100 block of dashed lines. The horizontal ones are BW
// while the vertical ones are AA.
void drawDashedLines(SkCanvas* canvas,
SkScalar lineLength,
SkScalar phase,
SkScalar dashLength,
int strokeWidth,
bool circles) {
SkPaint p;
p.setColor(SK_ColorBLACK);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SkIntToScalar(strokeWidth));
if (circles) {
p.setStrokeCap(SkPaint::kRound_Cap);
}
SkScalar intervals[2] = { dashLength, dashLength };
p.setPathEffect(SkDashPathEffect::Make(intervals, 2, phase));
SkPoint pts[2];
for (int y = 0; y < 100; y += 10*strokeWidth) {
pts[0].set(0, SkIntToScalar(y));
pts[1].set(lineLength, SkIntToScalar(y));
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
}
p.setAntiAlias(true);
for (int x = 0; x < 100; x += 14*strokeWidth) {
pts[0].set(SkIntToScalar(x), 0);
pts[1].set(SkIntToScalar(x), lineLength);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
}
}
virtual void onDraw(SkCanvas* canvas) {
// 1on/1off 1x1 squares with phase of 0 - points fastpath
canvas->save();
canvas->translate(2, 0);
this->drawDashedLines(canvas, 100, 0, SK_Scalar1, 1, false);
canvas->restore();
// 1on/1off 1x1 squares with phase of .5 - rects fastpath (due to partial squares)
canvas->save();
canvas->translate(112, 0);
this->drawDashedLines(canvas, 100, SK_ScalarHalf, SK_Scalar1, 1, false);
canvas->restore();
// 1on/1off 1x1 squares with phase of 1 - points fastpath
canvas->save();
canvas->translate(222, 0);
this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
canvas->restore();
// 1on/1off 1x1 squares with phase of 1 and non-integer length - rects fastpath
canvas->save();
canvas->translate(332, 0);
this->drawDashedLines(canvas, 99.5f, SK_ScalarHalf, SK_Scalar1, 1, false);
canvas->restore();
// 255on/255off 1x1 squares with phase of 0 - rects fast path
canvas->save();
canvas->translate(446, 0);
this->drawDashedLines(canvas, 100, 0, SkIntToScalar(255), 1, false);
canvas->restore();
// 1on/1off 3x3 squares with phase of 0 - points fast path
canvas->save();
canvas->translate(2, 110);
this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, false);
canvas->restore();
// 1on/1off 3x3 squares with phase of 1.5 - rects fast path
canvas->save();
canvas->translate(112, 110);
this->drawDashedLines(canvas, 100, 1.5f, SkIntToScalar(3), 3, false);
canvas->restore();
// 1on/1off 1x1 circles with phase of 1 - no fast path yet
canvas->save();
canvas->translate(2, 220);
this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, true);
canvas->restore();
// 1on/1off 3x3 circles with phase of 1 - no fast path yet
canvas->save();
canvas->translate(112, 220);
this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, true);
canvas->restore();
// 1on/1off 1x1 squares with rotation - should break fast path
canvas->save();
canvas->translate(332+SK_ScalarRoot2Over2*100, 110+SK_ScalarRoot2Over2*100);
canvas->rotate(45);
canvas->translate(-50, -50);
this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
canvas->restore();
// 3on/3off 3x1 rects - should use rect fast path regardless of phase
for (int phase = 0; phase <= 3; ++phase) {
canvas->save();
canvas->translate(SkIntToScalar(phase*110+2),
SkIntToScalar(330));
this->drawDashedLines(canvas, 100, SkIntToScalar(phase), SkIntToScalar(3), 1, false);
canvas->restore();
}
}
};
//////////////////////////////////////////////////////////////////////////////
class Dashing4GM : public skiagm::GM {
public:
Dashing4GM() {}
protected:
SkString onShortName() {
return SkString("dashing4");
}
SkISize onISize() { return SkISize::Make(640, 1100); }
virtual void onDraw(SkCanvas* canvas) {
constexpr struct {
int fOnInterval;
int fOffInterval;
} gData[] = {
{ 1, 1 },
{ 4, 2 },
{ 0, 4 }, // test for zero length on interval
};
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
canvas->translate(SK_ScalarHalf, SK_ScalarHalf);
for (int width = 0; width <= 2; ++width) {
for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
for (int aa = 0; aa <= 1; ++aa) {
for (int cap = 0; cap <= 1; ++cap) {
int w = width * width * width;
paint.setAntiAlias(SkToBool(aa));
paint.setStrokeWidth(SkIntToScalar(w));
SkToBool(cap) ? paint.setStrokeCap(SkPaint::kSquare_Cap)
: paint.setStrokeCap(SkPaint::kRound_Cap);
int scale = w ? w : 1;
drawline(canvas, gData[data].fOnInterval * scale,
gData[data].fOffInterval * scale,
paint);
canvas->translate(0, SkIntToScalar(20));
}
}
}
}
for (int aa = 0; aa <= 1; ++aa) {
paint.setAntiAlias(SkToBool(aa));
paint.setStrokeWidth(8.f);
paint.setStrokeCap(SkPaint::kSquare_Cap);
// Single dash element that is cut off at start and end
drawline(canvas, 32, 16, paint, 20.f, 0, 5.f);
canvas->translate(0, SkIntToScalar(20));
// Two dash elements where each one is cut off at beginning and end respectively
drawline(canvas, 32, 16, paint, 56.f, 0, 5.f);
canvas->translate(0, SkIntToScalar(20));
// Many dash elements where first and last are cut off at beginning and end respectively
drawline(canvas, 32, 16, paint, 584.f, 0, 5.f);
canvas->translate(0, SkIntToScalar(20));
// Diagonal dash line where src pnts are not axis aligned (as apposed to being diagonal from
// a canvas rotation)
drawline(canvas, 32, 16, paint, 600.f, 30.f);
canvas->translate(0, SkIntToScalar(20));
// Case where only the off interval exists on the line. Thus nothing should be drawn
drawline(canvas, 32, 16, paint, 8.f, 0.f, 40.f);
canvas->translate(0, SkIntToScalar(20));
}
// Test overlapping circles.
canvas->translate(SkIntToScalar(5), SkIntToScalar(20));
paint.setAntiAlias(true);
paint.setStrokeCap(SkPaint::kRound_Cap);
paint.setColor(0x44000000);
paint.setStrokeWidth(40);
drawline(canvas, 0, 30, paint);
canvas->translate(0, SkIntToScalar(50));
paint.setStrokeCap(SkPaint::kSquare_Cap);
drawline(canvas, 0, 30, paint);
// Test we draw the cap when the line length is zero.
canvas->translate(0, SkIntToScalar(50));
paint.setStrokeCap(SkPaint::kRound_Cap);
paint.setColor(0xFF000000);
paint.setStrokeWidth(11);
drawline(canvas, 0, 30, paint, 0);
canvas->translate(SkIntToScalar(100), 0);
drawline(canvas, 1, 30, paint, 0);
}
};
//////////////////////////////////////////////////////////////////////////////
class Dashing5GM : public skiagm::GM {
public:
Dashing5GM(bool doAA) : fDoAA(doAA) {}
protected:
bool runAsBench() const override { return true; }
SkString onShortName() override {
if (fDoAA) {
return SkString("dashing5_aa");
} else {
return SkString("dashing5_bw");
}
}
SkISize onISize() override { return SkISize::Make(400, 200); }
void onDraw(SkCanvas* canvas) override {
constexpr int kOn = 4;
constexpr int kOff = 4;
constexpr int kIntervalLength = kOn + kOff;
constexpr SkColor gColors[kIntervalLength] = {
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorCYAN,
SK_ColorMAGENTA,
SK_ColorYELLOW,
SK_ColorGRAY,
SK_ColorDKGRAY
};
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setAntiAlias(fDoAA);
SkMatrix rot;
rot.setRotate(90);
SkASSERT(rot.rectStaysRect());
canvas->concat(rot);
int sign; // used to toggle the direction of the lines
int phase = 0;
for (int x = 0; x < 200; x += 10) {
paint.setStrokeWidth(SkIntToScalar(phase+1));
paint.setColor(gColors[phase]);
sign = (x % 20) ? 1 : -1;
drawline(canvas, kOn, kOff, paint,
SkIntToScalar(x), -sign * SkIntToScalar(10003),
SkIntToScalar(phase),
SkIntToScalar(x), sign * SkIntToScalar(10003));
phase = (phase + 1) % kIntervalLength;
}
for (int y = -400; y < 0; y += 10) {
paint.setStrokeWidth(SkIntToScalar(phase+1));
paint.setColor(gColors[phase]);
sign = (y % 20) ? 1 : -1;
drawline(canvas, kOn, kOff, paint,
-sign * SkIntToScalar(10003), SkIntToScalar(y),
SkIntToScalar(phase),
sign * SkIntToScalar(10003), SkIntToScalar(y));
phase = (phase + 1) % kIntervalLength;
}
}
private:
bool fDoAA;
};
DEF_SIMPLE_GM(longpathdash, canvas, 612, 612) {
SkPath lines;
for (int x = 32; x < 256; x += 16) {
for (SkScalar a = 0; a < 3.141592f * 2; a += 0.03141592f) {
SkPoint pts[2] = {
{ 256 + (float) sin(a) * x,
256 + (float) cos(a) * x },
{ 256 + (float) sin(a + 3.141592 / 3) * (x + 64),
256 + (float) cos(a + 3.141592 / 3) * (x + 64) }
};
lines.moveTo(pts[0]);
for (SkScalar i = 0; i < 1; i += 0.05f) {
lines.lineTo(pts[0].fX * (1 - i) + pts[1].fX * i,
pts[0].fY * (1 - i) + pts[1].fY * i);
}
}
}
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(1);
const SkScalar intervals[] = { 1, 1 };
p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
canvas->translate(50, 50);
canvas->drawPath(lines, p);
}
DEF_SIMPLE_GM(longlinedash, canvas, 512, 512) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(80);
const SkScalar intervals[] = { 2, 2 };
p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
canvas->drawRect(SkRect::MakeXYWH(-10000, 100, 20000, 20), p);
}
DEF_SIMPLE_GM(longwavyline, canvas, 512, 512) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(2);
SkPath wavy;
wavy.moveTo(-10000, 100);
for (SkScalar i = -10000; i < 10000; i += 20) {
wavy.quadTo(i + 5, 95, i + 10, 100);
wavy.quadTo(i + 15, 105, i + 20, 100);
}
canvas->drawPath(wavy, p);
}
DEF_SIMPLE_GM(dashtextcaps, canvas, 512, 512) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(10);
p.setStrokeCap(SkPaint::kRound_Cap);
p.setStrokeJoin(SkPaint::kRound_Join);
p.setARGB(0xff, 0xbb, 0x00, 0x00);
SkFont font(ToolUtils::create_portable_typeface(), 100);
const SkScalar intervals[] = { 12, 12 };
p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
canvas->drawString("Sausages", 10, 90, font, p);
canvas->drawLine(8, 120, 456, 120, p);
}
DEF_SIMPLE_GM(dash_line_zero_off_interval, canvas, 160, 330) {
static constexpr SkScalar kIntervals[] = {5.f, 0.f, 2.f, 0.f};
SkPaint dashPaint;
dashPaint.setPathEffect(SkDashPathEffect::Make(kIntervals, SK_ARRAY_COUNT(kIntervals), 0.f));
SkASSERT(dashPaint.getPathEffect());
dashPaint.setStyle(SkPaint::kStroke_Style);
dashPaint.setStrokeWidth(20.f);
static constexpr struct {
SkPoint fA, fB;
} kLines[] = {{{0.5f, 0.5f}, {30.5f, 0.5f}}, // horizontal
{{0.5f, 0.5f}, {0.5f, 30.5f}}, // vertical
{{0.5f, 0.5f}, {0.5f, 0.5f}}, // point
{{0.5f, 0.5f}, {25.5f, 25.5f}}}; // diagonal
SkScalar pad = 5.f + dashPaint.getStrokeWidth();
canvas->translate(pad / 2.f, pad / 2.f);
canvas->save();
SkScalar h = 0.f;
for (const auto& line : kLines) {
h = SkTMax(h, SkScalarAbs(line.fA.fY - line.fB.fY));
}
for (const auto& line : kLines) {
SkScalar w = SkScalarAbs(line.fA.fX - line.fB.fX);
for (auto cap : {SkPaint::kButt_Cap, SkPaint::kSquare_Cap, SkPaint::kRound_Cap}) {
dashPaint.setStrokeCap(cap);
for (auto aa : {false, true}) {
dashPaint.setAntiAlias(aa);
canvas->drawLine(line.fA, line.fB, dashPaint);
canvas->translate(0.f, pad + h);
}
}
canvas->restore();
canvas->translate(pad + w, 0.f);
canvas->save();
}
}
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new DashingGM;)
DEF_GM(return new Dashing2GM;)
DEF_GM(return new Dashing3GM;)
DEF_GM(return new Dashing4GM;)
DEF_GM(return new Dashing5GM(true);)
DEF_GM(return new Dashing5GM(false);)
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