/* * 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/SkPathBuilder.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 #include 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.setStroke(true); 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 { struct Intervals { int fOnInterval; int fOffInterval; }; SkPaint paint; paint.setStroke(true); canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); canvas->translate(0, SK_ScalarHalf); for (int width = 0; width <= 2; ++width) { for (const Intervals& data : {Intervals{1, 1}, Intervals{4, 1}}) { for (bool aa : {false, true}) { int w = width * width * width; paint.setAntiAlias(aa); paint.setStrokeWidth(SkIntToScalar(w)); int scale = w ? w : 1; drawline(canvas, data.fOnInterval * scale, 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 SkPath make_unit_star(int n) { SkScalar rad = -SK_ScalarPI / 2; const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n; SkPathBuilder b; b.moveTo(0, -SK_Scalar1); for (int i = 1; i < n; i++) { rad += drad; b.lineTo(SkScalarCos(rad), SkScalarSin(rad)); } return b.close().detach(); } static SkPath make_path_line(const SkRect& bounds) { return SkPathBuilder().moveTo(bounds.left(), bounds.top()) .lineTo(bounds.right(), bounds.bottom()) .detach(); } static SkPath make_path_rect(const SkRect& bounds) { return SkPath::Rect(bounds); } static SkPath make_path_oval(const SkRect& bounds) { return SkPath::Oval(bounds); } static SkPath make_path_star(const SkRect& bounds) { SkPath path = make_unit_star(5); SkMatrix matrix; matrix.setRectToRect(path.getBounds(), bounds, SkMatrix::kCenter_ScaleToFit); return path.makeTransform(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 }; SkPath (*gProc[])(const SkRect&) = { make_path_line, make_path_rect, make_path_oval, make_path_star, }; SkPaint paint; paint.setAntiAlias(true); paint.setStroke(true); 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); canvas->drawPath(gProc[x](r), 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.setStroke(true); 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 { struct Intervals { int fOnInterval; int fOffInterval; }; SkPaint paint; paint.setStroke(true); canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); canvas->translate(SK_ScalarHalf, SK_ScalarHalf); for (int width = 0; width <= 2; ++width) { for (const Intervals& data : {Intervals{1, 1}, Intervals{4, 2}, Intervals{0, 4}}) { // test for zero length on interval for (bool aa : {false, true}) { for (auto cap : {SkPaint::kRound_Cap, SkPaint::kSquare_Cap}) { int w = width * width * width; paint.setAntiAlias(aa); paint.setStrokeWidth(SkIntToScalar(w)); paint.setStrokeCap(cap); int scale = w ? w : 1; drawline(canvas, data.fOnInterval * scale, 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.setStroke(true); 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.setStroke(true); 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.setStroke(true); 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.setStroke(true); 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.setStroke(true); 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.setStroke(true); 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 = std::max(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_SIMPLE_GM(thin_aa_dash_lines, canvas, 330, 110) { SkPaint paint; static constexpr SkScalar kScale = 100.f; static constexpr SkScalar kIntervals[] = {10/kScale, 5/kScale}; paint.setPathEffect(SkDashPathEffect::Make(kIntervals, SK_ARRAY_COUNT(kIntervals), 0.f)); paint.setAntiAlias(true); paint.setStrokeWidth(0.25f/kScale); // substep moves the subpixel offset every iteration. static constexpr SkScalar kSubstep = 0.05f/kScale; // We will draw a grid of horiz/vertical lines that pass through each other's off intervals. static constexpr SkScalar kStep = kIntervals[0] + kIntervals[1]; canvas->scale(kScale, kScale); canvas->translate(kIntervals[1], kIntervals[1]); for (auto c : {SkPaint::kButt_Cap, SkPaint::kSquare_Cap, SkPaint::kRound_Cap}) { paint.setStrokeCap(c); for (SkScalar x = -.5f*kIntervals[1]; x < 105/kScale; x += (kStep + kSubstep)) { canvas->drawLine({x, 0}, {x, 100/kScale}, paint); canvas->drawLine({0, x}, {100/kScale, x}, paint); } canvas->translate(110/kScale, 0); } } ////////////////////////////////////////////////////////////////////////////// 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);)