src/third_party/skia/gm/convexpolyclip.cpp - cobalt - Git at Google

 /*
  * Copyright 2014 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 "sk_tool_utils.h"

 #include "SkBitmap.h"
 #include "SkGradientShader.h"
 #include "SkPath.h"
 #include "SkTLList.h"

 static SkBitmap make_bmp(int w, int h) {
     SkBitmap bmp;
     bmp.allocN32Pixels(w, h, true);

     SkCanvas canvas(bmp);
     SkScalar wScalar = SkIntToScalar(w);
     SkScalar hScalar = SkIntToScalar(h);

     SkPoint     pt = { wScalar / 2, hScalar / 2 };

     SkScalar    radius = 3 * SkMaxScalar(wScalar, hScalar);

     SkColor     colors[] = { sk_tool_utils::color_to_565(SK_ColorDKGRAY),
                              sk_tool_utils::color_to_565(0xFF222255),
                              sk_tool_utils::color_to_565(0xFF331133),
                              sk_tool_utils::color_to_565(0xFF884422),
                              sk_tool_utils::color_to_565(0xFF000022), SK_ColorWHITE,
                              sk_tool_utils::color_to_565(0xFFAABBCC) };

     SkScalar    pos[] = {0,
                          SK_Scalar1 / 6,
                          2 * SK_Scalar1 / 6,
                          3 * SK_Scalar1 / 6,
                          4 * SK_Scalar1 / 6,
                          5 * SK_Scalar1 / 6,
                          SK_Scalar1};

     SkPaint paint;
     SkRect rect = SkRect::MakeWH(wScalar, hScalar);
     SkMatrix mat = SkMatrix::I();
     for (int i = 0; i < 4; ++i) {
         paint.setShader(SkGradientShader::MakeRadial(
                         pt, radius,
                         colors, pos,
                         SK_ARRAY_COUNT(colors),
                         SkShader::kRepeat_TileMode,
                         0, &mat));
         canvas.drawRect(rect, paint);
         rect.inset(wScalar / 8, hScalar / 8);
         mat.preTranslate(6 * wScalar, 6 * hScalar);
         mat.postScale(SK_Scalar1 / 3, SK_Scalar1 / 3);
     }

     paint.setAntiAlias(true);
     sk_tool_utils::set_portable_typeface(&paint);
     paint.setTextSize(wScalar / 2.2f);
     paint.setShader(0);
     paint.setColor(sk_tool_utils::color_to_565(SK_ColorLTGRAY));
     constexpr char kTxt[] = "Skia";
     SkPoint texPos = { wScalar / 17, hScalar / 2 + paint.getTextSize() / 2.5f };
     canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
     paint.setColor(SK_ColorBLACK);
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(SK_Scalar1);
     canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
     return bmp;
 }

 namespace skiagm {
 /**
  * This GM tests convex polygon clips.
  */
 class ConvexPolyClip : public GM {
 public:
     ConvexPolyClip() {
         this->setBGColor(0xFFFFFFFF);
     }

 protected:
     SkString onShortName() override {
         return SkString("convex_poly_clip");
     }

     SkISize onISize() override {
         // When benchmarking the saveLayer set of draws is skipped.
         int w = 435;
         if (kBench_Mode != this->getMode()) {
             w *= 2;
         }
         return SkISize::Make(w, 540);
     }

     void onOnceBeforeDraw() override {
         SkPath tri;
         tri.moveTo(5.f, 5.f);
         tri.lineTo(100.f, 20.f);
         tri.lineTo(15.f, 100.f);

         fClips.addToTail()->setPath(tri);

         SkPath hexagon;
         constexpr SkScalar kRadius = 45.f;
         const SkPoint center = { kRadius, kRadius };
         for (int i = 0; i < 6; ++i) {
             SkScalar angle = 2 * SK_ScalarPI * i / 6;
             SkPoint point;
             point.fY = SkScalarSinCos(angle, &point.fX);
             point.scale(kRadius);
             point = center + point;
             if (0 == i) {
                 hexagon.moveTo(point);
             } else {
                 hexagon.lineTo(point);
             }
         }
         fClips.addToTail()->setPath(hexagon);

         SkMatrix scaleM;
         scaleM.setScale(1.1f, 0.4f, kRadius, kRadius);
         hexagon.transform(scaleM);
         fClips.addToTail()->setPath(hexagon);

         fClips.addToTail()->setRect(SkRect::MakeXYWH(8.3f, 11.6f, 78.2f, 72.6f));

         SkPath rotRect;
         SkRect rect = SkRect::MakeLTRB(10.f, 12.f, 80.f, 86.f);
         rotRect.addRect(rect);
         SkMatrix rotM;
         rotM.setRotate(23.f, rect.centerX(), rect.centerY());
         rotRect.transform(rotM);
         fClips.addToTail()->setPath(rotRect);

         fBmp = make_bmp(100, 100);
     }

     void onDraw(SkCanvas* canvas) override {
         SkScalar y = 0;
         constexpr SkScalar kMargin = 10.f;

         SkPaint bgPaint;
         bgPaint.setAlpha(0x15);
         SkISize size = canvas->getBaseLayerSize();
         canvas->drawBitmapRect(fBmp, SkRect::MakeIWH(size.fWidth, size.fHeight), &bgPaint);

         constexpr char kTxt[] = "Clip Me!";
         SkPaint txtPaint;
         txtPaint.setTextSize(23.f);
         txtPaint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&txtPaint);
         txtPaint.setColor(sk_tool_utils::color_to_565(SK_ColorDKGRAY));
         SkScalar textW = txtPaint.measureText(kTxt, SK_ARRAY_COUNT(kTxt)-1);

         SkScalar startX = 0;
         int testLayers = kBench_Mode != this->getMode();
         for (int doLayer = 0; doLayer <= testLayers; ++doLayer) {
             for (ClipList::Iter iter(fClips, ClipList::Iter::kHead_IterStart);
                  iter.get();
                  iter.next()) {
                 const Clip* clip = iter.get();
                 SkScalar x = startX;
                 for (int aa = 0; aa < 2; ++aa) {
                     if (doLayer) {
                         SkRect bounds;
                         clip->getBounds(&bounds);
                         bounds.outset(2, 2);
                         bounds.offset(x, y);
                         canvas->saveLayer(&bounds, nullptr);
                     } else {
                         canvas->save();
                     }
                     canvas->translate(x, y);
                     clip->setOnCanvas(canvas, kIntersect_SkClipOp, SkToBool(aa));
                     canvas->drawBitmap(fBmp, 0, 0);
                     canvas->restore();
                     x += fBmp.width() + kMargin;
                 }
                 for (int aa = 0; aa < 2; ++aa) {

                     SkPaint clipOutlinePaint;
                     clipOutlinePaint.setAntiAlias(true);
                     clipOutlinePaint.setColor(0x50505050);
                     clipOutlinePaint.setStyle(SkPaint::kStroke_Style);
                     clipOutlinePaint.setStrokeWidth(0);

                     if (doLayer) {
                         SkRect bounds;
                         clip->getBounds(&bounds);
                         bounds.outset(2, 2);
                         bounds.offset(x, y);
                         canvas->saveLayer(&bounds, nullptr);
                     } else {
                         canvas->save();
                     }
                     canvas->translate(x, y);
                     SkPath closedClipPath;
                     clip->asClosedPath(&closedClipPath);
                     canvas->drawPath(closedClipPath, clipOutlinePaint);
                     clip->setOnCanvas(canvas, kIntersect_SkClipOp, SkToBool(aa));
                     canvas->scale(1.f, 1.8f);
                     canvas->drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1,
                                      0, 1.5f * txtPaint.getTextSize(),
                                      txtPaint);
                     canvas->restore();
                     x += textW + 2 * kMargin;
                 }
                 y += fBmp.height() + kMargin;
             }
             y = 0;
             startX += 2 * fBmp.width() + SkScalarCeilToInt(2 * textW) + 6 * kMargin;
         }
     }

     bool runAsBench() const override { return true; }

 private:
     class Clip {
     public:
         enum ClipType {
             kNone_ClipType,
             kPath_ClipType,
             kRect_ClipType
         };

         Clip () : fClipType(kNone_ClipType) {}

         void setOnCanvas(SkCanvas* canvas, SkClipOp op, bool aa) const {
             switch (fClipType) {
                 case kPath_ClipType:
                     canvas->clipPath(fPath, op, aa);
                     break;
                 case kRect_ClipType:
                     canvas->clipRect(fRect, op, aa);
                     break;
                 case kNone_ClipType:
                     SkDEBUGFAIL("Uninitialized Clip.");
                     break;
             }
         }

         void asClosedPath(SkPath* path) const {
             switch (fClipType) {
                 case kPath_ClipType:
                     *path = fPath;
                     path->close();
                     break;
                 case kRect_ClipType:
                     path->reset();
                     path->addRect(fRect);
                     break;
                 case kNone_ClipType:
                     SkDEBUGFAIL("Uninitialized Clip.");
                     break;
             }
         }

         void setPath(const SkPath& path) {
             fClipType = kPath_ClipType;
             fPath = path;
         }

         void setRect(const SkRect& rect) {
             fClipType = kRect_ClipType;
             fRect = rect;
             fPath.reset();
         }

         ClipType getType() const { return fClipType; }

         void getBounds(SkRect* bounds) const {
             switch (fClipType) {
                 case kPath_ClipType:
                     *bounds = fPath.getBounds();
                     break;
                 case kRect_ClipType:
                     *bounds = fRect;
                     break;
                 case kNone_ClipType:
                     SkDEBUGFAIL("Uninitialized Clip.");
                     break;
             }
         }

     private:
         ClipType fClipType;
         SkPath fPath;
         SkRect fRect;
     };

     typedef SkTLList<Clip, 1> ClipList;
     ClipList         fClips;
     SkBitmap         fBmp;

     typedef GM INHERITED;
 };

 DEF_GM(return new ConvexPolyClip;)
 }
	/*
	* Copyright 2014 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 "sk_tool_utils.h"

	#include "SkBitmap.h"
	#include "SkGradientShader.h"
	#include "SkPath.h"
	#include "SkTLList.h"

	static SkBitmap make_bmp(int w, int h) {
	SkBitmap bmp;
	bmp.allocN32Pixels(w, h, true);

	SkCanvas canvas(bmp);
	SkScalar wScalar = SkIntToScalar(w);
	SkScalar hScalar = SkIntToScalar(h);

	SkPoint pt = { wScalar / 2, hScalar / 2 };

	SkScalar radius = 3 * SkMaxScalar(wScalar, hScalar);

	SkColor colors[] = { sk_tool_utils::color_to_565(SK_ColorDKGRAY),
	sk_tool_utils::color_to_565(0xFF222255),
	sk_tool_utils::color_to_565(0xFF331133),
	sk_tool_utils::color_to_565(0xFF884422),
	sk_tool_utils::color_to_565(0xFF000022), SK_ColorWHITE,
	sk_tool_utils::color_to_565(0xFFAABBCC) };

	SkScalar pos[] = {0,
	SK_Scalar1 / 6,
	2 * SK_Scalar1 / 6,
	3 * SK_Scalar1 / 6,
	4 * SK_Scalar1 / 6,
	5 * SK_Scalar1 / 6,
	SK_Scalar1};

	SkPaint paint;
	SkRect rect = SkRect::MakeWH(wScalar, hScalar);
	SkMatrix mat = SkMatrix::I();
	for (int i = 0; i < 4; ++i) {
	paint.setShader(SkGradientShader::MakeRadial(
	pt, radius,
	colors, pos,
	SK_ARRAY_COUNT(colors),
	SkShader::kRepeat_TileMode,
	0, &mat));
	canvas.drawRect(rect, paint);
	rect.inset(wScalar / 8, hScalar / 8);
	mat.preTranslate(6 * wScalar, 6 * hScalar);
	mat.postScale(SK_Scalar1 / 3, SK_Scalar1 / 3);
	}

	paint.setAntiAlias(true);
	sk_tool_utils::set_portable_typeface(&paint);
	paint.setTextSize(wScalar / 2.2f);
	paint.setShader(0);
	paint.setColor(sk_tool_utils::color_to_565(SK_ColorLTGRAY));
	constexpr char kTxt[] = "Skia";
	SkPoint texPos = { wScalar / 17, hScalar / 2 + paint.getTextSize() / 2.5f };
	canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
	paint.setColor(SK_ColorBLACK);
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(SK_Scalar1);
	canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
	return bmp;
	}

	namespace skiagm {
	/**
	* This GM tests convex polygon clips.
	*/
	class ConvexPolyClip : public GM {
	public:
	ConvexPolyClip() {
	this->setBGColor(0xFFFFFFFF);
	}

	protected:
	SkString onShortName() override {
	return SkString("convex_poly_clip");
	}

	SkISize onISize() override {
	// When benchmarking the saveLayer set of draws is skipped.
	int w = 435;
	if (kBench_Mode != this->getMode()) {
	w *= 2;
	}
	return SkISize::Make(w, 540);
	}

	void onOnceBeforeDraw() override {
	SkPath tri;
	tri.moveTo(5.f, 5.f);
	tri.lineTo(100.f, 20.f);
	tri.lineTo(15.f, 100.f);

	fClips.addToTail()->setPath(tri);

	SkPath hexagon;
	constexpr SkScalar kRadius = 45.f;
	const SkPoint center = { kRadius, kRadius };
	for (int i = 0; i < 6; ++i) {
	SkScalar angle = 2 * SK_ScalarPI * i / 6;
	SkPoint point;
	point.fY = SkScalarSinCos(angle, &point.fX);
	point.scale(kRadius);
	point = center + point;
	if (0 == i) {
	hexagon.moveTo(point);
	} else {
	hexagon.lineTo(point);
	}
	}
	fClips.addToTail()->setPath(hexagon);

	SkMatrix scaleM;
	scaleM.setScale(1.1f, 0.4f, kRadius, kRadius);
	hexagon.transform(scaleM);
	fClips.addToTail()->setPath(hexagon);

	fClips.addToTail()->setRect(SkRect::MakeXYWH(8.3f, 11.6f, 78.2f, 72.6f));

	SkPath rotRect;
	SkRect rect = SkRect::MakeLTRB(10.f, 12.f, 80.f, 86.f);
	rotRect.addRect(rect);
	SkMatrix rotM;
	rotM.setRotate(23.f, rect.centerX(), rect.centerY());
	rotRect.transform(rotM);
	fClips.addToTail()->setPath(rotRect);

	fBmp = make_bmp(100, 100);
	}

	void onDraw(SkCanvas* canvas) override {
	SkScalar y = 0;
	constexpr SkScalar kMargin = 10.f;

	SkPaint bgPaint;
	bgPaint.setAlpha(0x15);
	SkISize size = canvas->getBaseLayerSize();
	canvas->drawBitmapRect(fBmp, SkRect::MakeIWH(size.fWidth, size.fHeight), &bgPaint);

	constexpr char kTxt[] = "Clip Me!";
	SkPaint txtPaint;
	txtPaint.setTextSize(23.f);
	txtPaint.setAntiAlias(true);
	sk_tool_utils::set_portable_typeface(&txtPaint);
	txtPaint.setColor(sk_tool_utils::color_to_565(SK_ColorDKGRAY));
	SkScalar textW = txtPaint.measureText(kTxt, SK_ARRAY_COUNT(kTxt)-1);

	SkScalar startX = 0;
	int testLayers = kBench_Mode != this->getMode();
	for (int doLayer = 0; doLayer <= testLayers; ++doLayer) {
	for (ClipList::Iter iter(fClips, ClipList::Iter::kHead_IterStart);
	iter.get();
	iter.next()) {
	const Clip* clip = iter.get();
	SkScalar x = startX;
	for (int aa = 0; aa < 2; ++aa) {
	if (doLayer) {
	SkRect bounds;
	clip->getBounds(&bounds);
	bounds.outset(2, 2);
	bounds.offset(x, y);
	canvas->saveLayer(&bounds, nullptr);
	} else {
	canvas->save();
	}
	canvas->translate(x, y);
	clip->setOnCanvas(canvas, kIntersect_SkClipOp, SkToBool(aa));
	canvas->drawBitmap(fBmp, 0, 0);
	canvas->restore();
	x += fBmp.width() + kMargin;
	}
	for (int aa = 0; aa < 2; ++aa) {

	SkPaint clipOutlinePaint;
	clipOutlinePaint.setAntiAlias(true);
	clipOutlinePaint.setColor(0x50505050);
	clipOutlinePaint.setStyle(SkPaint::kStroke_Style);
	clipOutlinePaint.setStrokeWidth(0);

	if (doLayer) {
	SkRect bounds;
	clip->getBounds(&bounds);
	bounds.outset(2, 2);
	bounds.offset(x, y);
	canvas->saveLayer(&bounds, nullptr);
	} else {
	canvas->save();
	}
	canvas->translate(x, y);
	SkPath closedClipPath;
	clip->asClosedPath(&closedClipPath);
	canvas->drawPath(closedClipPath, clipOutlinePaint);
	clip->setOnCanvas(canvas, kIntersect_SkClipOp, SkToBool(aa));
	canvas->scale(1.f, 1.8f);
	canvas->drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1,
	0, 1.5f * txtPaint.getTextSize(),
	txtPaint);
	canvas->restore();
	x += textW + 2 * kMargin;
	}
	y += fBmp.height() + kMargin;
	}
	y = 0;
	startX += 2 * fBmp.width() + SkScalarCeilToInt(2 * textW) + 6 * kMargin;
	}
	}

	bool runAsBench() const override { return true; }

	private:
	class Clip {
	public:
	enum ClipType {
	kNone_ClipType,
	kPath_ClipType,
	kRect_ClipType
	};

	Clip () : fClipType(kNone_ClipType) {}

	void setOnCanvas(SkCanvas* canvas, SkClipOp op, bool aa) const {
	switch (fClipType) {
	case kPath_ClipType:
	canvas->clipPath(fPath, op, aa);
	break;
	case kRect_ClipType:
	canvas->clipRect(fRect, op, aa);
	break;
	case kNone_ClipType:
	SkDEBUGFAIL("Uninitialized Clip.");
	break;
	}
	}

	void asClosedPath(SkPath* path) const {
	switch (fClipType) {
	case kPath_ClipType:
	*path = fPath;
	path->close();
	break;
	case kRect_ClipType:
	path->reset();
	path->addRect(fRect);
	break;
	case kNone_ClipType:
	SkDEBUGFAIL("Uninitialized Clip.");
	break;
	}
	}

	void setPath(const SkPath& path) {
	fClipType = kPath_ClipType;
	fPath = path;
	}

	void setRect(const SkRect& rect) {
	fClipType = kRect_ClipType;
	fRect = rect;
	fPath.reset();
	}

	ClipType getType() const { return fClipType; }

	void getBounds(SkRect* bounds) const {
	switch (fClipType) {
	case kPath_ClipType:
	*bounds = fPath.getBounds();
	break;
	case kRect_ClipType:
	*bounds = fRect;
	break;
	case kNone_ClipType:
	SkDEBUGFAIL("Uninitialized Clip.");
	break;
	}
	}

	private:
	ClipType fClipType;
	SkPath fPath;
	SkRect fRect;
	};

	typedef SkTLList<Clip, 1> ClipList;
	ClipList fClips;
	SkBitmap fBmp;

	typedef GM INHERITED;
	};

	DEF_GM(return new ConvexPolyClip;)
	}