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Expand dashing3 GM to include additional dashing cases

Browse Source 
https://codereview.appspot.com/6870056/



git-svn-id: http://skia.googlecode.com/svn/trunk@6667 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
robertphillips@google.com 2012-12-04 20:34:11 +00:00
parent a444430281
commit 8c685c5d75
1 changed files with 66 additions and 18 deletions
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84
gm/dashing.cpp
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@ -185,62 +185,110 @@ protected:
// Draw a 100x100 block of dashed lines. The horizontal ones are BW
// while the vertical ones are AA.
void drawDashedLines(SkCanvas* canvas, SkScalar length, SkScalar phase) {
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(SK_Scalar1);
p.setStrokeWidth(SkIntToScalar(strokeWidth));
SkScalar intervals[2] = { SK_Scalar1, SK_Scalar1 };
if (circles) {
p.setStrokeCap(SkPaint::kRound_Cap);
}
SkScalar intervals[2] = { dashLength, dashLength };
p.setPathEffect(new SkDashPathEffect(intervals, 2, phase, false));
SkPoint pts[2];
for (int y = 0; y < 100; y += 5) {
for (int y = 0; y < 100; y += 10*strokeWidth) {
pts[0].set(0, SkIntToScalar(y));
pts[1].set(length, 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 += 7) {
for (int x = 0; x < 100; x += 14*strokeWidth) {
pts[0].set(SkIntToScalar(x), 0);
pts[1].set(SkIntToScalar(x), length);
pts[1].set(SkIntToScalar(x), lineLength);
canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
}
}
virtual void onDraw(SkCanvas* canvas) {
// fast path should work on this run
// 1on/1off 1x1 squares with phase of 0 - points fastpath
canvas->save();
this->drawDashedLines(canvas, 100, SK_Scalar1);
canvas->translate(2, 0);
this->drawDashedLines(canvas, 100, 0, SK_Scalar1, 1, false);
canvas->restore();
// non-1 phase should break the fast path
// 1on/1off 1x1 squares with phase of .5 - rects fastpath (due to partial squares)
canvas->save();
canvas->translate(110, 0);
this->drawDashedLines(canvas, 100, SK_ScalarHalf);
canvas->translate(112, 0);
this->drawDashedLines(canvas, 100, SK_ScalarHalf, SK_Scalar1, 1, false);
canvas->restore();
// non-integer length should break the fast path
// 1on/1off 1x1 squares with phase of 1 - points fastpath
canvas->save();
canvas->translate(220, 0);
this->drawDashedLines(canvas, 99.5, SK_ScalarHalf);
canvas->translate(222, 0);
this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
canvas->restore();
// rotation should break the fast path
// 1on/1off 1x1 squares with phase of 1 and non-integer length - rects fastpath
canvas->save();
canvas->translate(110+SK_ScalarRoot2Over2*100, 110+SK_ScalarRoot2Over2*100);
canvas->translate(332, 0);
this->drawDashedLines(canvas, 99.5, SK_ScalarHalf, SK_Scalar1, 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, SkFloatToScalar(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);
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();
}
}
};