1c4029296f
Depends on https://codereview.chromium.org/873753002/ Thumbs up to CLion for refactoring this for me. BUG=skia: Review URL: https://codereview.chromium.org/867963004
484 lines
15 KiB
C++
484 lines
15 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkPaint.h"
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#include "SkDashPathEffect.h"
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static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint,
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SkScalar finalX = SkIntToScalar(600), SkScalar finalY = SkIntToScalar(0),
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SkScalar phase = SkIntToScalar(0),
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SkScalar startX = SkIntToScalar(0), SkScalar startY = SkIntToScalar(0)) {
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SkPaint p(paint);
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const SkScalar intervals[] = {
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SkIntToScalar(on),
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SkIntToScalar(off),
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};
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p.setPathEffect(SkDashPathEffect::Create(intervals, 2, phase))->unref();
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canvas->drawLine(startX, startY, finalX, finalY, p);
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}
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// earlier bug stopped us from drawing very long single-segment dashes, because
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// SkPathMeasure was skipping very small delta-T values (nearlyzero). This is
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// now fixes, so this giant dash should appear.
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static void show_giant_dash(SkCanvas* canvas) {
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SkPaint paint;
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drawline(canvas, 1, 1, paint, SkIntToScalar(20 * 1000));
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}
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static void show_zero_len_dash(SkCanvas* canvas) {
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SkPaint paint;
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drawline(canvas, 2, 2, paint, SkIntToScalar(0));
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(2));
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canvas->translate(0, SkIntToScalar(20));
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drawline(canvas, 4, 4, paint, SkIntToScalar(0));
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}
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class DashingGM : public skiagm::GM {
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public:
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DashingGM() {}
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protected:
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SkString onShortName() {
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return SkString("dashing");
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}
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SkISize onISize() { return SkISize::Make(640, 300); }
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virtual void onDraw(SkCanvas* canvas) {
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static const struct {
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int fOnInterval;
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int fOffInterval;
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} gData[] = {
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{ 1, 1 },
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{ 4, 1 },
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};
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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canvas->translate(0, SK_ScalarHalf);
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for (int width = 0; width <= 2; ++width) {
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for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
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for (int aa = 0; aa <= 1; ++aa) {
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int w = width * width * width;
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paint.setAntiAlias(SkToBool(aa));
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paint.setStrokeWidth(SkIntToScalar(w));
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int scale = w ? w : 1;
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drawline(canvas, gData[data].fOnInterval * scale,
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gData[data].fOffInterval * scale,
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paint);
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canvas->translate(0, SkIntToScalar(20));
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}
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}
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}
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show_giant_dash(canvas);
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canvas->translate(0, SkIntToScalar(20));
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show_zero_len_dash(canvas);
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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static void make_unit_star(SkPath* path, int n) {
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SkScalar rad = -SK_ScalarPI / 2;
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const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
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path->moveTo(0, -SK_Scalar1);
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for (int i = 1; i < n; i++) {
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rad += drad;
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SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
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path->lineTo(cosV, sinV);
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}
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path->close();
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}
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static void make_path_line(SkPath* path, const SkRect& bounds) {
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path->moveTo(bounds.left(), bounds.top());
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path->lineTo(bounds.right(), bounds.bottom());
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}
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static void make_path_rect(SkPath* path, const SkRect& bounds) {
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path->addRect(bounds);
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}
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static void make_path_oval(SkPath* path, const SkRect& bounds) {
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path->addOval(bounds);
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}
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static void make_path_star(SkPath* path, const SkRect& bounds) {
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make_unit_star(path, 5);
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SkMatrix matrix;
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matrix.setRectToRect(path->getBounds(), bounds, SkMatrix::kCenter_ScaleToFit);
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path->transform(matrix);
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}
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class Dashing2GM : public skiagm::GM {
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public:
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Dashing2GM() {}
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protected:
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SkString onShortName() {
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return SkString("dashing2");
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}
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SkISize onISize() { return SkISize::Make(640, 480); }
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virtual void onDraw(SkCanvas* canvas) {
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static const int gIntervals[] = {
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3, // 3 dashes: each count [0] followed by intervals [1..count]
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2, 10, 10,
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4, 20, 5, 5, 5,
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2, 2, 2
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};
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void (*gProc[])(SkPath*, const SkRect&) = {
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make_path_line, make_path_rect, make_path_oval, make_path_star,
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};
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(6));
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SkRect bounds = SkRect::MakeWH(SkIntToScalar(120), SkIntToScalar(120));
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bounds.offset(SkIntToScalar(20), SkIntToScalar(20));
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SkScalar dx = bounds.width() * 4 / 3;
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SkScalar dy = bounds.height() * 4 / 3;
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const int* intervals = &gIntervals[1];
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for (int y = 0; y < gIntervals[0]; ++y) {
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SkScalar vals[SK_ARRAY_COUNT(gIntervals)]; // more than enough
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int count = *intervals++;
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for (int i = 0; i < count; ++i) {
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vals[i] = SkIntToScalar(*intervals++);
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}
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SkScalar phase = vals[0] / 2;
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paint.setPathEffect(SkDashPathEffect::Create(vals, count, phase))->unref();
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for (size_t x = 0; x < SK_ARRAY_COUNT(gProc); ++x) {
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SkPath path;
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SkRect r = bounds;
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r.offset(x * dx, y * dy);
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gProc[x](&path, r);
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canvas->drawPath(path, paint);
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}
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}
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}
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};
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//////////////////////////////////////////////////////////////////////////////
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// Test out the on/off line dashing Chrome if fond of
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class Dashing3GM : public skiagm::GM {
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public:
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Dashing3GM() {}
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protected:
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SkString onShortName() {
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return SkString("dashing3");
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}
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SkISize onISize() { return SkISize::Make(640, 480); }
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// Draw a 100x100 block of dashed lines. The horizontal ones are BW
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// while the vertical ones are AA.
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void drawDashedLines(SkCanvas* canvas,
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SkScalar lineLength,
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SkScalar phase,
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SkScalar dashLength,
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int strokeWidth,
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bool circles) {
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SkPaint p;
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p.setColor(SK_ColorBLACK);
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p.setStyle(SkPaint::kStroke_Style);
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p.setStrokeWidth(SkIntToScalar(strokeWidth));
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if (circles) {
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p.setStrokeCap(SkPaint::kRound_Cap);
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}
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SkScalar intervals[2] = { dashLength, dashLength };
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p.setPathEffect(SkDashPathEffect::Create(intervals, 2, phase))->unref();
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SkPoint pts[2];
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for (int y = 0; y < 100; y += 10*strokeWidth) {
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pts[0].set(0, SkIntToScalar(y));
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pts[1].set(lineLength, SkIntToScalar(y));
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
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}
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p.setAntiAlias(true);
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for (int x = 0; x < 100; x += 14*strokeWidth) {
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pts[0].set(SkIntToScalar(x), 0);
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pts[1].set(SkIntToScalar(x), lineLength);
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canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
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}
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}
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virtual void onDraw(SkCanvas* canvas) {
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// 1on/1off 1x1 squares with phase of 0 - points fastpath
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canvas->save();
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canvas->translate(2, 0);
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this->drawDashedLines(canvas, 100, 0, SK_Scalar1, 1, false);
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canvas->restore();
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// 1on/1off 1x1 squares with phase of .5 - rects fastpath (due to partial squares)
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canvas->save();
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canvas->translate(112, 0);
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this->drawDashedLines(canvas, 100, SK_ScalarHalf, SK_Scalar1, 1, false);
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canvas->restore();
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// 1on/1off 1x1 squares with phase of 1 - points fastpath
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canvas->save();
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canvas->translate(222, 0);
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this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
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canvas->restore();
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// 1on/1off 1x1 squares with phase of 1 and non-integer length - rects fastpath
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canvas->save();
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canvas->translate(332, 0);
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this->drawDashedLines(canvas, 99.5f, SK_ScalarHalf, SK_Scalar1, 1, false);
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canvas->restore();
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// 255on/255off 1x1 squares with phase of 0 - rects fast path
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canvas->save();
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canvas->translate(446, 0);
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this->drawDashedLines(canvas, 100, 0, SkIntToScalar(255), 1, false);
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canvas->restore();
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// 1on/1off 3x3 squares with phase of 0 - points fast path
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canvas->save();
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canvas->translate(2, 110);
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this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, false);
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canvas->restore();
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// 1on/1off 3x3 squares with phase of 1.5 - rects fast path
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canvas->save();
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canvas->translate(112, 110);
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this->drawDashedLines(canvas, 100, 1.5f, SkIntToScalar(3), 3, false);
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canvas->restore();
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// 1on/1off 1x1 circles with phase of 1 - no fast path yet
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canvas->save();
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canvas->translate(2, 220);
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this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, true);
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canvas->restore();
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// 1on/1off 3x3 circles with phase of 1 - no fast path yet
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canvas->save();
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canvas->translate(112, 220);
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this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, true);
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canvas->restore();
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// 1on/1off 1x1 squares with rotation - should break fast path
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canvas->save();
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canvas->translate(332+SK_ScalarRoot2Over2*100, 110+SK_ScalarRoot2Over2*100);
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canvas->rotate(45);
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canvas->translate(-50, -50);
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this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
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canvas->restore();
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// 3on/3off 3x1 rects - should use rect fast path regardless of phase
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for (int phase = 0; phase <= 3; ++phase) {
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canvas->save();
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canvas->translate(SkIntToScalar(phase*110+2),
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SkIntToScalar(330));
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this->drawDashedLines(canvas, 100, SkIntToScalar(phase), SkIntToScalar(3), 1, false);
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canvas->restore();
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}
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}
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};
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//////////////////////////////////////////////////////////////////////////////
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class Dashing4GM : public skiagm::GM {
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public:
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Dashing4GM() {}
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protected:
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SkString onShortName() {
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return SkString("dashing4");
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}
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SkISize onISize() { return SkISize::Make(640, 950); }
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virtual void onDraw(SkCanvas* canvas) {
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static const struct {
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int fOnInterval;
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int fOffInterval;
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} gData[] = {
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{ 1, 1 },
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{ 4, 2 },
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{ 0, 4 }, // test for zero length on interval
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};
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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canvas->translate(0, SK_ScalarHalf);
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for (int width = 0; width <= 2; ++width) {
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for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
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for (int aa = 0; aa <= 1; ++aa) {
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for (int cap = 0; cap <= 1; ++cap) {
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int w = width * width * width;
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paint.setAntiAlias(SkToBool(aa));
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paint.setStrokeWidth(SkIntToScalar(w));
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SkToBool(cap) ? paint.setStrokeCap(SkPaint::kSquare_Cap)
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: paint.setStrokeCap(SkPaint::kRound_Cap);
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int scale = w ? w : 1;
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drawline(canvas, gData[data].fOnInterval * scale,
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gData[data].fOffInterval * scale,
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paint);
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canvas->translate(0, SkIntToScalar(20));
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}
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}
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}
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}
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for (int aa = 0; aa <= 1; ++aa) {
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paint.setAntiAlias(SkToBool(aa));
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paint.setStrokeWidth(8.f);
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paint.setStrokeCap(SkPaint::kSquare_Cap);
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// Single dash element that is cut off at start and end
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drawline(canvas, 32, 16, paint, 20.f, 0, 5.f);
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canvas->translate(0, SkIntToScalar(20));
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// Two dash elements where each one is cut off at beginning and end respectively
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drawline(canvas, 32, 16, paint, 56.f, 0, 5.f);
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canvas->translate(0, SkIntToScalar(20));
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// Many dash elements where first and last are cut off at beginning and end respectively
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drawline(canvas, 32, 16, paint, 584.f, 0, 5.f);
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canvas->translate(0, SkIntToScalar(20));
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// Diagonal dash line where src pnts are not axis aligned (as apposed to being diagonal from
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// a canvas rotation)
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drawline(canvas, 32, 16, paint, 600.f, 30.f);
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canvas->translate(0, SkIntToScalar(20));
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// Case where only the off interval exists on the line. Thus nothing should be drawn
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drawline(canvas, 32, 16, paint, 8.f, 0.f, 40.f);
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canvas->translate(0, SkIntToScalar(20));
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}
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}
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};
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//////////////////////////////////////////////////////////////////////////////
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class Dashing5GM : public skiagm::GM {
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public:
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Dashing5GM(bool doAA) : fDoAA(doAA) {}
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protected:
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bool runAsBench() const SK_OVERRIDE { return true; }
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SkString onShortName() SK_OVERRIDE {
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if (fDoAA) {
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return SkString("dashing5_aa");
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} else {
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return SkString("dashing5_bw");
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}
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}
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SkISize onISize() SK_OVERRIDE { return SkISize::Make(400, 200); }
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void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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static const int kOn = 4;
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static const int kOff = 4;
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static const int kIntervalLength = kOn + kOff;
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static const SkColor gColors[kIntervalLength] = {
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SK_ColorRED,
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SK_ColorGREEN,
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SK_ColorBLUE,
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SK_ColorCYAN,
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SK_ColorMAGENTA,
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SK_ColorYELLOW,
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SK_ColorGRAY,
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SK_ColorDKGRAY
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};
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setAntiAlias(fDoAA);
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SkMatrix rot;
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rot.setRotate(90);
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SkASSERT(rot.rectStaysRect());
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canvas->concat(rot);
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int sign; // used to toggle the direction of the lines
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int phase = 0;
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for (int x = 0; x < 200; x += 10) {
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paint.setStrokeWidth(SkIntToScalar(phase+1));
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paint.setColor(gColors[phase]);
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sign = (x % 20) ? 1 : -1;
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drawline(canvas, kOn, kOff, paint,
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SkIntToScalar(x), -sign * SkIntToScalar(10003),
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SkIntToScalar(phase),
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SkIntToScalar(x), sign * SkIntToScalar(10003));
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phase = (phase + 1) % kIntervalLength;
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}
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for (int y = -400; y < 0; y += 10) {
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paint.setStrokeWidth(SkIntToScalar(phase+1));
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paint.setColor(gColors[phase]);
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sign = (y % 20) ? 1 : -1;
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drawline(canvas, kOn, kOff, paint,
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-sign * SkIntToScalar(10003), SkIntToScalar(y),
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SkIntToScalar(phase),
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sign * SkIntToScalar(10003), SkIntToScalar(y));
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phase = (phase + 1) % kIntervalLength;
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}
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}
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private:
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bool fDoAA;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return SkNEW(DashingGM);)
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DEF_GM(return SkNEW(Dashing2GM);)
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DEF_GM(return SkNEW(Dashing3GM);)
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DEF_GM(return SkNEW(Dashing4GM);)
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DEF_GM(return SkNEW_ARGS(Dashing5GM, (true));)
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DEF_GM(return SkNEW_ARGS(Dashing5GM, (false));)
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