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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 "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/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/SkTypeface.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkDashPathEffect.h"
- #include "tools/ToolUtils.h"
- #include <math.h>
- #include <initializer_list>
- 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 {
- SkString onShortName() override { return SkString("dashing"); }
- SkISize onISize() override { return {640, 340}; }
- void onDraw(SkCanvas* canvas) override {
- 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 {
- SkString onShortName() override { return SkString("dashing2"); }
- SkISize onISize() override { return {640, 480}; }
- void onDraw(SkCanvas* canvas) override {
- 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 {
- SkString onShortName() override { return SkString("dashing3"); }
- SkISize onISize() override { return {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);
- }
- }
- void onDraw(SkCanvas* canvas) override {
- // 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 {
- SkString onShortName() override { return SkString("dashing4"); }
- SkISize onISize() override { return {640, 1100}; }
- void onDraw(SkCanvas* canvas) override {
- 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) {}
- private:
- bool runAsBench() const override { return true; }
- SkString onShortName() override { return SkString(fDoAA ? "dashing5_aa" : "dashing5_bw"); }
- SkISize onISize() override { return {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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