| /* |
| * 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.h" |
| #include "SkCanvas.h" |
| #include "SkPaint.h" |
| #include "SkDashPathEffect.h" |
| |
| static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint, |
| SkScalar finalX = SkIntToScalar(600)) { |
| SkPaint p(paint); |
| |
| const SkScalar intervals[] = { |
| SkIntToScalar(on), |
| SkIntToScalar(off), |
| }; |
| |
| p.setPathEffect(new SkDashPathEffect(intervals, 2, 0))->unref(); |
| canvas->drawLine(0, 0, finalX, 0, 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)); |
| } |
| |
| class DashingGM : public skiagm::GM { |
| public: |
| DashingGM() {} |
| |
| protected: |
| SkString onShortName() { |
| return SkString("dashing"); |
| } |
| |
| SkISize onISize() { return skiagm::make_isize(640, 300); } |
| |
| virtual void onDraw(SkCanvas* canvas) { |
| static const 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); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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; |
| SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV); |
| path->lineTo(cosV, sinV); |
| } |
| 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 skiagm::make_isize(640, 480); } |
| |
| virtual void onDraw(SkCanvas* canvas) { |
| static const 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(new SkDashPathEffect(vals, count, phase))->unref(); |
| |
| 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 skiagm::make_isize(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(new SkDashPathEffect(intervals, 2, phase, false))->unref(); |
| |
| 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(); |
| } |
| } |
| |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static skiagm::GM* F0(void*) { return new DashingGM; } |
| static skiagm::GM* F1(void*) { return new Dashing2GM; } |
| static skiagm::GM* F2(void*) { return new Dashing3GM; } |
| |
| static skiagm::GMRegistry gR0(F0); |
| static skiagm::GMRegistry gR1(F1); |
| static skiagm::GMRegistry gR2(F2); |