diff options
author | robertphillips <robertphillips@google.com> | 2016-05-31 06:59:18 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2016-05-31 06:59:18 -0700 |
commit | 0ee622021c92f01ee79952b2162654e8abfaa00d (patch) | |
tree | 68c13a151d4bdaa3e06f9f96bd374acdf9e4cd77 /gm/strokedlines.cpp | |
parent | 93966d88efb090f77f6109f0e19cc982b83d5da9 (diff) |
Add new GM to exercise stroked line special case
This is a companion to: https://codereview.chromium.org/2023693002/ (Handle stroked single line special case in Ganesh)
The idea is to land this CL first so any regressions are visible.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2019193002
Review-Url: https://codereview.chromium.org/2019193002
Diffstat (limited to 'gm/strokedlines.cpp')
-rw-r--r-- | gm/strokedlines.cpp | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/gm/strokedlines.cpp b/gm/strokedlines.cpp new file mode 100644 index 0000000000..f0eb6b45cf --- /dev/null +++ b/gm/strokedlines.cpp @@ -0,0 +1,228 @@ +/* + * Copyright 2016 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 "SkBlurMaskFilter.h" +#include "SkDashPathEffect.h" +#include "SkGradientShader.h" +#include "SkPaint.h" +#include "SkPath.h" +#include "SkPoint3.h" + +static const int kNumColumns = 6; +static const int kNumRows = 8; +static const int kRadius = 40; // radius of the snowflake +static const int kPad = 5; // padding on both sides of the snowflake +static const int kNumSpokes = 6; +static const SkScalar kStrokeWidth = 5.0f; + +static void draw_fins(SkCanvas* canvas, const SkPoint& offset, float angle, const SkPaint& paint) { + SkScalar cos, sin; + + // first fin + sin = SkScalarSinCos(angle + (SK_ScalarPI/4), &cos); + sin *= kRadius / 2.0f; + cos *= kRadius / 2.0f; + + SkPath p; + p.moveTo(offset.fX, offset.fY); + p.lineTo(offset.fX + cos, offset.fY + sin); + canvas->drawPath(p, paint); + + // second fin + sin = SkScalarSinCos(angle - (SK_ScalarPI/4), &cos); + sin *= kRadius / 2.0f; + cos *= kRadius / 2.0f; + + p.reset(); + p.moveTo(offset.fX, offset.fY); + p.lineTo(offset.fX + cos, offset.fY + sin); + canvas->drawPath(p, paint); +} + +// draw a snowflake centered at the origin +static void draw_snowflake(SkCanvas* canvas, const SkPaint& paint) { + + canvas->clipRect(SkRect::MakeLTRB(-kRadius-kPad, -kRadius-kPad, kRadius+kPad, kRadius+kPad)); + + SkScalar sin, cos, angle = 0.0f; + for (int i = 0; i < kNumSpokes/2; ++i, angle += SK_ScalarPI/(kNumSpokes/2)) { + sin = SkScalarSinCos(angle, &cos); + sin *= kRadius; + cos *= kRadius; + + // main spoke + SkPath p; + p.moveTo(-cos, -sin); + p.lineTo(cos, sin); + canvas->drawPath(p, paint); + + // fins on positive side + const SkPoint posOffset = SkPoint::Make(0.5f * cos, 0.5f * sin); + draw_fins(canvas, posOffset, angle, paint); + + // fins on negative side + const SkPoint negOffset = SkPoint::Make(-0.5f * cos, -0.5f * sin); + draw_fins(canvas, negOffset, angle+SK_ScalarPI, paint); + } +} + +static void draw_row(SkCanvas* canvas, const SkPaint& paint, const SkMatrix& localMatrix) { + canvas->translate(kRadius+kPad, 0.0f); + + for (auto cap : { SkPaint::kButt_Cap, SkPaint::kRound_Cap, SkPaint::kSquare_Cap }) { + for (auto isAA : { true, false }) { + SkPaint tmp(paint); + tmp.setStrokeWidth(kStrokeWidth); + tmp.setStyle(SkPaint::kStroke_Style); + tmp.setStrokeCap(cap); + tmp.setAntiAlias(isAA); + + int saveCount = canvas->save(); + canvas->concat(localMatrix); + draw_snowflake(canvas, tmp); + canvas->restoreToCount(saveCount); + + canvas->translate(2*(kRadius+kPad), 0.0f); + } + } +} + +namespace skiagm { + +// This GM exercises the special case of a stroked lines. +// Various shaders are applied to ensure the coordinate spaces work out right. +class StrokedLinesGM : public GM { +public: + StrokedLinesGM() { + this->setBGColor(sk_tool_utils::color_to_565(0xFF1A65D7)); + } + +protected: + SkString onShortName() override { + return SkString("strokedlines"); + } + + SkISize onISize() override { + return SkISize::Make(kNumColumns * (2*kRadius+2*kPad), kNumRows * (2*kRadius+2*kPad)); + } + + void onOnceBeforeDraw() override { + // paints + { + // basic white + SkPaint p; + p.setColor(SK_ColorWHITE); + fPaints.push_back(p); + } + { + // gradient + SkColor colors[] = { SK_ColorRED, SK_ColorGREEN }; + SkPoint pts[] = { {-kRadius-kPad, -kRadius-kPad }, { kRadius+kPad, kRadius+kPad } }; + + SkPaint p; + p.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, + SkShader::kClamp_TileMode, 0, nullptr)); + + fPaints.push_back(p); + } + { + // dashing + SkScalar intervals[] = { kStrokeWidth, kStrokeWidth }; + int intervalCount = (int) SK_ARRAY_COUNT(intervals); + SkPaint p; + p.setColor(SK_ColorWHITE); + p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, kStrokeWidth)); + + fPaints.push_back(p); + } + { + // Bitmap shader + SkBitmap bm; + bm.allocN32Pixels(2, 2); + *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF; + *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = 0x0; + + SkMatrix m; + m.setRotate(12.0f); + m.preScale(3.0f, 3.0f);; + + SkPaint p; + p.setShader(SkShader::MakeBitmapShader(bm, + SkShader::kRepeat_TileMode, + SkShader::kRepeat_TileMode, + &m)); + fPaints.push_back(p); + } + { + // blur + SkPaint p; + p.setColor(SK_ColorWHITE); + p.setMaskFilter(SkBlurMaskFilter::Make(kOuter_SkBlurStyle, 3.0f, + SkBlurMaskFilter::kHighQuality_BlurFlag)); + fPaints.push_back(p); + } + + // matrices + { + // rotation + SkMatrix m; + m.setRotate(12.0f); + + fMatrices.push_back(m); + } + { + // skew + SkMatrix m; + m.setSkew(0.3f, 0.5f); + + fMatrices.push_back(m); + } + { + // perspective + SkMatrix m; + m.reset(); + m.setPerspX(-SK_Scalar1 / 300); + m.setPerspY(SK_Scalar1 / 300); + + fMatrices.push_back(m); + } + + SkASSERT(kNumRows == fPaints.count() + fMatrices.count()); + } + + void onDraw(SkCanvas* canvas) override { + canvas->translate(0, kRadius+kPad); + + for (int i = 0; i < fPaints.count(); ++i) { + int saveCount = canvas->save(); + draw_row(canvas, fPaints[i], SkMatrix::I()); + canvas->restoreToCount(saveCount); + + canvas->translate(0, 2*(kRadius+kPad)); + } + + for (int i = 0; i < fMatrices.count(); ++i) { + int saveCount = canvas->save(); + draw_row(canvas, fPaints[0], fMatrices[i]); + canvas->restoreToCount(saveCount); + + canvas->translate(0, 2*(kRadius+kPad)); + } + } + +private: + SkTArray<SkPaint> fPaints; + SkTArray<SkMatrix> fMatrices; + + typedef GM INHERITED; +}; + +////////////////////////////////////////////////////////////////////////////// + +DEF_GM(return new StrokedLinesGM;) +} |