| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkPath.h" |
| #include "SkStream.h" |
| #include "gm.h" |
| |
| |
| // Test how short paths are stroked with various caps |
| class StrokeZeroGM : public skiagm::GM { |
| SkPath fPaths[8]; |
| SkPath fClipL, fClipR, fClipS; |
| |
| protected: |
| void onOnceBeforeDraw() override { |
| fClipL.moveTo(0, 0); |
| fClipL.lineTo(3, 0); |
| fClipL.lineTo(2.5f, 1); |
| fClipL.lineTo(3.5f, 2.5f); |
| fClipL.lineTo(2.5f, 4); |
| fClipL.lineTo(3, 5); |
| fClipL.lineTo(0, 5); |
| fClipL.close(); |
| |
| fClipR.moveTo(34, 0); |
| fClipR.lineTo(34, 5); |
| fClipR.lineTo(31, 5); |
| fClipR.lineTo(30.5, 4); |
| fClipR.lineTo(31.5, 2.5); |
| fClipR.lineTo(30.5, 1); |
| fClipR.lineTo(31, 0); |
| fClipR.close(); |
| |
| fClipS.addRect(SkRect::MakeIWH(4, 5)); |
| |
| fPaths[0].moveTo(30, 0); // single line segment |
| fPaths[0].rLineTo(30, 0); |
| |
| fPaths[1].moveTo(90, 0); // single line segment with close (does not draw caps) |
| fPaths[1].rLineTo(30, 0); |
| fPaths[1].close(); |
| |
| fPaths[2].moveTo(150, 0); // zero-length line |
| fPaths[2].rLineTo(0, 0); |
| |
| fPaths[3].moveTo(180, 0); // zero-length line with close (expected not to draw) |
| fPaths[3].rLineTo(0, 0); |
| fPaths[3].close(); |
| |
| fPaths[4].moveTo(210, 0); // close only, no line |
| fPaths[4].close(); |
| |
| fPaths[5].moveTo(30, 90); // all combos below should draw two caps |
| fPaths[5].rLineTo(0, 0); |
| fPaths[5].moveTo(60, 90); |
| fPaths[5].rLineTo(0, 0); |
| |
| fPaths[6].moveTo(90, 90); |
| fPaths[6].close(); |
| fPaths[6].moveTo(120, 90); |
| fPaths[6].close(); |
| |
| fPaths[7].moveTo(150, 90); |
| fPaths[7].rLineTo(0, 0); |
| fPaths[7].moveTo(180, 90); |
| fPaths[7].close(); |
| } |
| |
| |
| SkString onShortName() override { |
| return SkString("path_stroke_with_zero_length"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(1120, 840); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint bkgrnd; |
| bkgrnd.setColor(SK_ColorWHITE); |
| canvas->drawRect(SkRect::MakeIWH(onISize().fWidth, onISize().fHeight), bkgrnd); |
| |
| auto drawPaths = [&](SkPaint& paint, int indexMask) { |
| canvas->translate(0, 30.0f); |
| int index = 0; |
| for (const SkPath& path : fPaths) { |
| if (indexMask & (1 << index)) { |
| canvas->drawPath(path, paint); |
| } |
| if (this->getMode() == skiagm::GM::kSample_Mode && paint.getStrokeWidth() < 2) { |
| drawFat(canvas, path, paint, index); |
| } |
| ++index; |
| } |
| }; |
| |
| if (false) { // debugging variant that draws a single element |
| SkScalar width = 0; |
| bool antialias = true; |
| |
| SkPaint butt; |
| butt.setAntiAlias(antialias); |
| butt.setStyle(SkPaint::kStroke_Style); |
| butt.setStrokeWidth(width); |
| |
| SkPaint round(butt); |
| round.setStrokeCap(SkPaint::kRound_Cap); |
| drawPaths(round, 1 << 7); |
| return; |
| } |
| |
| SkScalar widths[] = { 0, .999f, 1, 1.001f, 20 }; |
| bool aliases[] = { false, true }; |
| for (bool antialias : aliases) { |
| canvas->save(); |
| for (SkScalar width : widths) { |
| canvas->save(); |
| SkPaint butt; |
| butt.setAntiAlias(antialias); |
| butt.setStyle(SkPaint::kStroke_Style); |
| butt.setStrokeWidth(width); |
| drawPaths(butt, -1); |
| |
| SkPaint round(butt); |
| round.setStrokeCap(SkPaint::kRound_Cap); |
| drawPaths(round, -1); |
| |
| SkPaint square(butt); |
| square.setStrokeCap(SkPaint::kSquare_Cap); |
| drawPaths(square, -1); |
| canvas->restore(); |
| canvas->translate(220, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, 210); |
| } |
| } |
| |
| private: |
| void drawFat(SkCanvas* canvas, const SkPath& path, const SkPaint& paint, int index) { |
| const SkScalar scale = 10; |
| SkRect bounds = path.getBounds(); |
| SkBitmap offscreen; |
| offscreen.allocN32Pixels(SkScalarRoundToInt(bounds.width() + 4), |
| SkScalarRoundToInt(bounds.height() + 4)); |
| offscreen.eraseColor(SK_ColorWHITE); |
| SkScalar pathX = bounds.fLeft - 2; |
| SkScalar pathY = bounds.fTop - 2; |
| SkMatrix cMatrix = canvas->getTotalMatrix(); |
| if (!canvas->readPixels(&offscreen, SkScalarRoundToInt(pathX + cMatrix.getTranslateX()), |
| SkScalarRoundToInt(pathY + cMatrix.getTranslateY()))) { |
| return; |
| } |
| |
| canvas->save(); |
| SkMatrix clipM; |
| clipM.reset(); |
| clipM.preScale(scale, scale); |
| clipM.postTranslate(bounds.fLeft - 17, bounds.fTop - 24.5f + 420); |
| SkPath clip; |
| if (index < 2) { |
| fClipL.transform(clipM, &clip); |
| } else { |
| fClipS.transform(clipM, &clip); |
| } |
| canvas->clipPath(clip, true); |
| canvas->scale(scale, scale); |
| canvas->drawBitmap(offscreen, (bounds.fLeft - 17) / scale, |
| (bounds.fTop - 20 + 420) / scale); |
| canvas->restore(); |
| |
| if (bounds.width() > 20) { |
| canvas->save(); |
| clipM.reset(); |
| clipM.preScale(scale, scale); |
| clipM.postTranslate(bounds.fLeft - 17 - 275, bounds.fTop - 24.5f + 420); |
| SkPath clip; |
| fClipR.transform(clipM, &clip); |
| canvas->clipPath(clip, true); |
| canvas->scale(10.f, 10.f); |
| canvas->drawBitmap(offscreen, (bounds.fLeft - 17 - 275 |
| + (index >= 5 ? 5 : 0)) / scale, (bounds.fTop - 20 + 420) / scale); |
| canvas->restore(); |
| } |
| } |
| |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM( return new StrokeZeroGM(); ) |