gm/pathfill.cpp - skia - Git at Google

 /*
  * Copyright 2011 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 "SkPath.h"

 typedef SkScalar (*MakePathProc)(SkPath*);

 static SkScalar make_frame(SkPath* path) {
     SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
                  SkIntToScalar(630), SkIntToScalar(470) };
     path->addRoundRect(r, SkIntToScalar(15), SkIntToScalar(15));

     SkPaint paint;
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(SkIntToScalar(5));
     paint.getFillPath(*path, path);
     return SkIntToScalar(15);
 }

 static SkScalar make_triangle(SkPath* path) {
     constexpr int gCoord[] = {
         10, 20, 15, 5, 30, 30
     };
     path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
     path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
     path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
     path->close();
     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     return SkIntToScalar(30);
 }

 static SkScalar make_rect(SkPath* path) {
     SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
                  SkIntToScalar(30), SkIntToScalar(30) };
     path->addRect(r);
     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     return SkIntToScalar(30);
 }

 static SkScalar make_oval(SkPath* path) {
     SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
                  SkIntToScalar(30), SkIntToScalar(30) };
     path->addOval(r);
     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     return SkIntToScalar(30);
 }

 static SkScalar make_sawtooth(SkPath* path, int teeth) {
     SkScalar x = SkIntToScalar(20);
     SkScalar y = SkIntToScalar(20);
     const SkScalar x0 = x;
     const SkScalar dx = SkIntToScalar(5);
     const SkScalar dy = SkIntToScalar(10);

     path->moveTo(x, y);
     for (int i = 0; i < teeth; i++) {
         x += dx;
         path->lineTo(x, y - dy);
         x += dx;
         path->lineTo(x, y + dy);
     }
     path->lineTo(x, y + (2 * dy));
     path->lineTo(x0, y + (2 * dy));
     path->close();
     return SkIntToScalar(30);
 }

 static SkScalar make_sawtooth_3(SkPath* path) { return make_sawtooth(path, 3); }
 static SkScalar make_sawtooth_32(SkPath* path) { return make_sawtooth(path, 32); }

 static SkScalar make_house(SkPath* path) {
     path->moveTo(21, 23);
     path->lineTo(21, 11.534f);
     path->lineTo(22.327f, 12.741f);
     path->lineTo(23.673f, 11.261f);
     path->lineTo(12, 0.648f);
     path->lineTo(8, 4.285f);
     path->lineTo(8, 2);
     path->lineTo(4, 2);
     path->lineTo(4, 7.921f);
     path->lineTo(0.327f, 11.26f);
     path->lineTo(1.673f, 12.74f);
     path->lineTo(3, 11.534f);
     path->lineTo(3, 23);
     path->lineTo(11, 23);
     path->lineTo(11, 18);
     path->lineTo(13, 18);
     path->lineTo(13, 23);
     path->lineTo(21, 23);
     path->close();
     path->lineTo(9, 16);
     path->lineTo(9, 21);
     path->lineTo(5, 21);
     path->lineTo(5, 9.715f);
     path->lineTo(12, 3.351f);
     path->lineTo(19, 9.715f);
     path->lineTo(19, 21);
     path->lineTo(15, 21);
     path->lineTo(15, 16);
     path->lineTo(9, 16);
     path->close();
     path->offset(20, 0);
     return SkIntToScalar(30);
 }

 static SkScalar make_star(SkPath* path, int n) {
     const SkScalar c = SkIntToScalar(45);
     const SkScalar r = SkIntToScalar(20);

     SkScalar rad = -SK_ScalarPI / 2;
     const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;

     path->moveTo(c, c - r);
     for (int i = 1; i < n; i++) {
         rad += drad;
         SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
         path->lineTo(c + cosV * r, c + sinV * r);
     }
     path->close();
     return r * 2 * 6 / 5;
 }

 static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
 static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }

 // We don't expect any output from this path.
 static SkScalar make_line(SkPath* path) {
     path->moveTo(SkIntToScalar(30), SkIntToScalar(30));
     path->lineTo(SkIntToScalar(120), SkIntToScalar(40));
     path->close();
     path->moveTo(SkIntToScalar(150), SkIntToScalar(30));
     path->lineTo(SkIntToScalar(150), SkIntToScalar(30));
     path->lineTo(SkIntToScalar(300), SkIntToScalar(40));
     path->close();
     return SkIntToScalar(40);
 }

 static SkScalar make_info(SkPath* path) {
     path->moveTo(24, 4);
     path->cubicTo(12.94999980926514f,
                   4,
                   4,
                   12.94999980926514f,
                   4,
                   24);
     path->cubicTo(4,
                   35.04999923706055f,
                   12.94999980926514f,
                   44,
                   24,
                   44);
     path->cubicTo(35.04999923706055f,
                   44,
                   44,
                   35.04999923706055f,
                   44,
                   24);
     path->cubicTo(44,
                   12.95000076293945f,
                   35.04999923706055f,
                   4,
                   24,
                   4);
     path->close();
     path->moveTo(26, 34);
     path->lineTo(22, 34);
     path->lineTo(22, 22);
     path->lineTo(26, 22);
     path->lineTo(26, 34);
     path->close();
     path->moveTo(26, 18);
     path->lineTo(22, 18);
     path->lineTo(22, 14);
     path->lineTo(26, 14);
     path->lineTo(26, 18);
     path->close();

     return SkIntToScalar(44);
 }

 constexpr MakePathProc gProcs[] = {
     make_frame,
     make_triangle,
     make_rect,
     make_oval,
     make_sawtooth_32,
     make_star_5,
     make_star_13,
     make_line,
     make_house,
     make_sawtooth_3,
 };

 #define N   SK_ARRAY_COUNT(gProcs)

 class PathFillGM : public skiagm::GM {
     SkPath  fPath[N];
     SkScalar fDY[N];
     SkPath  fInfoPath;
 protected:
     void onOnceBeforeDraw() override {
         for (size_t i = 0; i < N; i++) {
             fDY[i] = gProcs[i](&fPath[i]);
         }

         (void) make_info(&fInfoPath);
     }


     SkString onShortName() override {
         return SkString("pathfill");
     }

     SkISize onISize() override {
         return SkISize::Make(640, 480);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(true);

         for (size_t i = 0; i < N; i++) {
             canvas->drawPath(fPath[i], paint);
             canvas->translate(SkIntToScalar(0), fDY[i]);
         }

         canvas->scale(0.300000011920929f, 0.300000011920929f);
         canvas->translate(50, 50);
         canvas->drawPath(fInfoPath, paint);
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 // test inverse-fill w/ a clip that completely excludes the geometry
 class PathInverseFillGM : public skiagm::GM {
     SkPath  fPath[N];
     SkScalar fDY[N];
 protected:
     void onOnceBeforeDraw() override {
         for (size_t i = 0; i < N; i++) {
             fDY[i] = gProcs[i](&fPath[i]);
         }
     }

     SkString onShortName() override {
         return SkString("pathinvfill");
     }

     SkISize onISize() override {
         return SkISize::Make(450, 220);
     }

     static void show(SkCanvas* canvas, const SkPath& path, const SkPaint& paint,
                      const SkRect* clip, SkScalar top, const SkScalar bottom) {
         canvas->save();
         if (clip) {
             SkRect r = *clip;
             r.fTop = top;
             r.fBottom = bottom;
             canvas->clipRect(r);
         }
         canvas->drawPath(path, paint);
         canvas->restore();
     }

     void onDraw(SkCanvas* canvas) override {
         SkPath path;

         path.addCircle(SkIntToScalar(50), SkIntToScalar(50), SkIntToScalar(40));
         path.toggleInverseFillType();

         SkRect clipR = { 0, 0, SkIntToScalar(100), SkIntToScalar(200) };

         canvas->translate(SkIntToScalar(10), SkIntToScalar(10));

         for (int doclip = 0; doclip <= 1; ++doclip) {
             for (int aa = 0; aa <= 1; ++aa) {
                 SkPaint paint;
                 paint.setAntiAlias(SkToBool(aa));

                 canvas->save();
                 canvas->clipRect(clipR);

                 const SkRect* clipPtr = doclip ? &clipR : nullptr;

                 show(canvas, path, paint, clipPtr, clipR.fTop, clipR.centerY());
                 show(canvas, path, paint, clipPtr, clipR.centerY(), clipR.fBottom);

                 canvas->restore();
                 canvas->translate(SkIntToScalar(110), 0);
             }
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 DEF_SIMPLE_GM(rotatedcubicpath, canvas, 200, 200) {
     SkPaint p;
     p.setAntiAlias(true);
     p.setStyle(SkPaint::kFill_Style);

     canvas->translate(50, 50);
     SkPath path;
     path.moveTo(48,-23);
     path.cubicTo(48,-29.5, 6,-30, 6,-30);
     path.cubicTo(6,-30, 2,0, 2,0);
     path.cubicTo(2,0, 44,-21.5, 48,-23);
     path.close();

     p.setColor(SK_ColorBLUE);
     canvas->drawPath(path, p);

     // Rotated path, which is not antialiased on GPU
     p.setColor(SK_ColorRED);
     canvas->rotate(90);
     canvas->drawPath(path, p);
 }

 ///////////////////////////////////////////////////////////////////////////////

 DEF_GM( return new PathFillGM; )
 DEF_GM( return new PathInverseFillGM; )
	/*
	* Copyright 2011 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 "SkPath.h"

	typedef SkScalar (MakePathProc)(SkPath);

	static SkScalar make_frame(SkPath* path) {
	SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
	SkIntToScalar(630), SkIntToScalar(470) };
	path->addRoundRect(r, SkIntToScalar(15), SkIntToScalar(15));

	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(SkIntToScalar(5));
	paint.getFillPath(*path, path);
	return SkIntToScalar(15);
	}

	static SkScalar make_triangle(SkPath* path) {
	constexpr int gCoord[] = {
	10, 20, 15, 5, 30, 30
	};
	path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
	path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
	path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
	path->close();
	path->offset(SkIntToScalar(10), SkIntToScalar(0));
	return SkIntToScalar(30);
	}

	static SkScalar make_rect(SkPath* path) {
	SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
	SkIntToScalar(30), SkIntToScalar(30) };
	path->addRect(r);
	path->offset(SkIntToScalar(10), SkIntToScalar(0));
	return SkIntToScalar(30);
	}

	static SkScalar make_oval(SkPath* path) {
	SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
	SkIntToScalar(30), SkIntToScalar(30) };
	path->addOval(r);
	path->offset(SkIntToScalar(10), SkIntToScalar(0));
	return SkIntToScalar(30);
	}

	static SkScalar make_sawtooth(SkPath* path, int teeth) {
	SkScalar x = SkIntToScalar(20);
	SkScalar y = SkIntToScalar(20);
	const SkScalar x0 = x;
	const SkScalar dx = SkIntToScalar(5);
	const SkScalar dy = SkIntToScalar(10);

	path->moveTo(x, y);
	for (int i = 0; i < teeth; i++) {
	x += dx;
	path->lineTo(x, y - dy);
	x += dx;
	path->lineTo(x, y + dy);
	}
	path->lineTo(x, y + (2 * dy));
	path->lineTo(x0, y + (2 * dy));
	path->close();
	return SkIntToScalar(30);
	}

	static SkScalar make_sawtooth_3(SkPath* path) { return make_sawtooth(path, 3); }
	static SkScalar make_sawtooth_32(SkPath* path) { return make_sawtooth(path, 32); }

	static SkScalar make_house(SkPath* path) {
	path->moveTo(21, 23);
	path->lineTo(21, 11.534f);
	path->lineTo(22.327f, 12.741f);
	path->lineTo(23.673f, 11.261f);
	path->lineTo(12, 0.648f);
	path->lineTo(8, 4.285f);
	path->lineTo(8, 2);
	path->lineTo(4, 2);
	path->lineTo(4, 7.921f);
	path->lineTo(0.327f, 11.26f);
	path->lineTo(1.673f, 12.74f);
	path->lineTo(3, 11.534f);
	path->lineTo(3, 23);
	path->lineTo(11, 23);
	path->lineTo(11, 18);
	path->lineTo(13, 18);
	path->lineTo(13, 23);
	path->lineTo(21, 23);
	path->close();
	path->lineTo(9, 16);
	path->lineTo(9, 21);
	path->lineTo(5, 21);
	path->lineTo(5, 9.715f);
	path->lineTo(12, 3.351f);
	path->lineTo(19, 9.715f);
	path->lineTo(19, 21);
	path->lineTo(15, 21);
	path->lineTo(15, 16);
	path->lineTo(9, 16);
	path->close();
	path->offset(20, 0);
	return SkIntToScalar(30);
	}

	static SkScalar make_star(SkPath* path, int n) {
	const SkScalar c = SkIntToScalar(45);
	const SkScalar r = SkIntToScalar(20);

	SkScalar rad = -SK_ScalarPI / 2;
	const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;

	path->moveTo(c, c - r);
	for (int i = 1; i < n; i++) {
	rad += drad;
	SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
	path->lineTo(c + cosV * r, c + sinV * r);
	}
	path->close();
	return r * 2 * 6 / 5;
	}

	static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
	static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }

	// We don't expect any output from this path.
	static SkScalar make_line(SkPath* path) {
	path->moveTo(SkIntToScalar(30), SkIntToScalar(30));
	path->lineTo(SkIntToScalar(120), SkIntToScalar(40));
	path->close();
	path->moveTo(SkIntToScalar(150), SkIntToScalar(30));
	path->lineTo(SkIntToScalar(150), SkIntToScalar(30));
	path->lineTo(SkIntToScalar(300), SkIntToScalar(40));
	path->close();
	return SkIntToScalar(40);
	}

	static SkScalar make_info(SkPath* path) {
	path->moveTo(24, 4);
	path->cubicTo(12.94999980926514f,
	4,
	4,
	12.94999980926514f,
	4,
	24);
	path->cubicTo(4,
	35.04999923706055f,
	12.94999980926514f,
	44,
	24,
	44);
	path->cubicTo(35.04999923706055f,
	44,
	44,
	35.04999923706055f,
	44,
	24);
	path->cubicTo(44,
	12.95000076293945f,
	35.04999923706055f,
	4,
	24,
	4);
	path->close();
	path->moveTo(26, 34);
	path->lineTo(22, 34);
	path->lineTo(22, 22);
	path->lineTo(26, 22);
	path->lineTo(26, 34);
	path->close();
	path->moveTo(26, 18);
	path->lineTo(22, 18);
	path->lineTo(22, 14);
	path->lineTo(26, 14);
	path->lineTo(26, 18);
	path->close();

	return SkIntToScalar(44);
	}

	constexpr MakePathProc gProcs[] = {
	make_frame,
	make_triangle,
	make_rect,
	make_oval,
	make_sawtooth_32,
	make_star_5,
	make_star_13,
	make_line,
	make_house,
	make_sawtooth_3,
	};

	#define N SK_ARRAY_COUNT(gProcs)

	class PathFillGM : public skiagm::GM {
	SkPath fPath[N];
	SkScalar fDY[N];
	SkPath fInfoPath;
	protected:
	void onOnceBeforeDraw() override {
	for (size_t i = 0; i < N; i++) {
	fDY[i] = gProcs[i](&fPath[i]);
	}

	(void) make_info(&fInfoPath);
	}


	SkString onShortName() override {
	return SkString("pathfill");
	}

	SkISize onISize() override {
	return SkISize::Make(640, 480);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setAntiAlias(true);

	for (size_t i = 0; i < N; i++) {
	canvas->drawPath(fPath[i], paint);
	canvas->translate(SkIntToScalar(0), fDY[i]);
	}

	canvas->scale(0.300000011920929f, 0.300000011920929f);
	canvas->translate(50, 50);
	canvas->drawPath(fInfoPath, paint);
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	// test inverse-fill w/ a clip that completely excludes the geometry
	class PathInverseFillGM : public skiagm::GM {
	SkPath fPath[N];
	SkScalar fDY[N];
	protected:
	void onOnceBeforeDraw() override {
	for (size_t i = 0; i < N; i++) {
	fDY[i] = gProcs[i](&fPath[i]);
	}
	}

	SkString onShortName() override {
	return SkString("pathinvfill");
	}

	SkISize onISize() override {
	return SkISize::Make(450, 220);
	}

	static void show(SkCanvas* canvas, const SkPath& path, const SkPaint& paint,
	const SkRect* clip, SkScalar top, const SkScalar bottom) {
	canvas->save();
	if (clip) {
	SkRect r = *clip;
	r.fTop = top;
	r.fBottom = bottom;
	canvas->clipRect(r);
	}
	canvas->drawPath(path, paint);
	canvas->restore();
	}

	void onDraw(SkCanvas* canvas) override {
	SkPath path;

	path.addCircle(SkIntToScalar(50), SkIntToScalar(50), SkIntToScalar(40));
	path.toggleInverseFillType();

	SkRect clipR = { 0, 0, SkIntToScalar(100), SkIntToScalar(200) };

	canvas->translate(SkIntToScalar(10), SkIntToScalar(10));

	for (int doclip = 0; doclip <= 1; ++doclip) {
	for (int aa = 0; aa <= 1; ++aa) {
	SkPaint paint;
	paint.setAntiAlias(SkToBool(aa));

	canvas->save();
	canvas->clipRect(clipR);

	const SkRect* clipPtr = doclip ? &clipR : nullptr;

	show(canvas, path, paint, clipPtr, clipR.fTop, clipR.centerY());
	show(canvas, path, paint, clipPtr, clipR.centerY(), clipR.fBottom);

	canvas->restore();
	canvas->translate(SkIntToScalar(110), 0);
	}
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	DEF_SIMPLE_GM(rotatedcubicpath, canvas, 200, 200) {
	SkPaint p;
	p.setAntiAlias(true);
	p.setStyle(SkPaint::kFill_Style);

	canvas->translate(50, 50);
	SkPath path;
	path.moveTo(48,-23);
	path.cubicTo(48,-29.5, 6,-30, 6,-30);
	path.cubicTo(6,-30, 2,0, 2,0);
	path.cubicTo(2,0, 44,-21.5, 48,-23);
	path.close();

	p.setColor(SK_ColorBLUE);
	canvas->drawPath(path, p);

	// Rotated path, which is not antialiased on GPU
	p.setColor(SK_ColorRED);
	canvas->rotate(90);
	canvas->drawPath(path, p);
	}

	///////////////////////////////////////////////////////////////////////////////

	DEF_GM( return new PathFillGM; )
	DEF_GM( return new PathInverseFillGM; )