gm/aaclip.cpp - platform/external/skqp - Gitiles

 /*
  * 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 "sk_tool_utils.h"
 #include "SkCanvas.h"
 #include "SkPath.h"
 #include "SkMakeUnique.h"

 static void do_draw(SkCanvas* canvas, const SkRect& r) {
     SkPaint paint;
     paint.setBlendMode(SkBlendMode::kSrc);
     paint.setColor(0x800000FF);
     canvas->drawRect(r, paint);
 }

 /**
  *  Exercise kDontClipToLayer_Legacy_SaveLayerFlag flag, which does not limit the clip to the
  *  layer's bounds. Thus when a draw occurs, it can (depending on "where" it is) draw into the layer
  *  and/or draw onto the surrounding portions of the canvas, or both.
  *
  *  This GM has a 100x100 rectangle (r), which its going to draw. However first it creates a layer
  *  with this flag covering 1/2 of the rectangle (upper half). Then it draws the rect in SRC mode.
  *
  *  The portion of the draw that intersects the layer should see the SRC draw, apply it to the layer
  *  and then during restore, it will SRC_OVER that layer onto the canvas (SRC_OVER since the layer
  *  has no paint, so it gets the default xfermode during restore).
  *
  *  Note: when we talk about drawing directly into the "canvas", in fact we are drawing into an
  *        "outer" layer we created (filled with red). This is a testing detail, so that our final
  *        output image is itself opaque, otherwise we make it harder to view the GM as a PNG.
  *
  *  The portion of the draw below the layer draws directly into the canvas. Since it is in SRC mode,
  *  it will write 0x80 to the canvas' alpha, overwriting the "red", which then gets blended with
  *  the GM's white background.
  *
  *  The portion in the layer, will end up SRC_OVERing the 0x80 layer pixels onto the canvas' red
  *  pixels, making magenta.
  *
  *  Thus the expected result is the upper half to be magenta 0xFF7F0080, and the lower half to be
  *  light blue 0xFF7F7FFF.
  */
 DEF_SIMPLE_GM(dont_clip_to_layer, canvas, 120, 120) {
     const SkRect r { 10, 10, 110, 110 };

     // Wrap the entire test inside a red layer, so we don't punch the actual gm's alpha with
     // kSrc_Mode, which makes it hard to view (we like our GMs to have opaque pixels).
     canvas->saveLayer(&r, nullptr);
     canvas->drawColor(SK_ColorRED);

     SkRect r0 = { 20, 20, 100, 55 };
     SkRect r1 = { 20, 65, 100, 100 };

     SkCanvas::SaveLayerRec rec;
     rec.fPaint = nullptr;
     rec.fBounds = &r0;
     rec.fBackdrop = nullptr;
     rec.fSaveLayerFlags = 1 << 31;//SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag;
     canvas->saveLayer(rec);
     rec.fBounds = &r1;
     canvas->saveLayer(rec);
     do_draw(canvas, r);
     canvas->restore();

     canvas->restore();  // red-layer
 }

 /** Draw a 2px border around the target, then red behind the target;
     set the clip to match the target, then draw >> the target in blue.
 */

 static void draw(SkCanvas* canvas, SkRect& target, int x, int y) {
     SkPaint borderPaint;
     borderPaint.setColor(SkColorSetRGB(0x0, 0xDD, 0x0));
     borderPaint.setAntiAlias(true);
     SkPaint backgroundPaint;
     backgroundPaint.setColor(SkColorSetRGB(0xDD, 0x0, 0x0));
     backgroundPaint.setAntiAlias(true);
     SkPaint foregroundPaint;
     foregroundPaint.setColor(SkColorSetRGB(0x0, 0x0, 0xDD));
     foregroundPaint.setAntiAlias(true);

     canvas->save();
     canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
     target.inset(SkIntToScalar(-2), SkIntToScalar(-2));
     canvas->drawRect(target, borderPaint);
     target.inset(SkIntToScalar(2), SkIntToScalar(2));
     canvas->drawRect(target, backgroundPaint);
     canvas->clipRect(target, true);
     target.inset(SkIntToScalar(-4), SkIntToScalar(-4));
     canvas->drawRect(target, foregroundPaint);
     canvas->restore();
 }

 static void draw_square(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 10 * SK_Scalar1));
     draw(canvas, target, x, y);
 }

 static void draw_column(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(1 * SK_Scalar1, 10 * SK_Scalar1));
     draw(canvas, target, x, y);
 }

 static void draw_bar(SkCanvas* canvas, int x, int y) {
     SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 1 * SK_Scalar1));
     draw(canvas, target, x, y);
 }

 static void draw_rect_tests(SkCanvas* canvas) {
     draw_square(canvas, 10, 10);
     draw_column(canvas, 30, 10);
     draw_bar(canvas, 10, 30);
 }

 /**
    Test a set of clipping problems discovered while writing blitAntiRect,
    and test all the code paths through the clipping blitters.
    Each region should show as a blue center surrounded by a 2px green
    border, with no red.
 */

 class AAClipGM : public skiagm::GM {
 public:
     AAClipGM() {

     }

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

     SkISize onISize() override {
         return SkISize::Make(240, 120);
     }

     void onDraw(SkCanvas* canvas) override {
         // Initial pixel-boundary-aligned draw
         draw_rect_tests(canvas);

         // Repeat 4x with .2, .4, .6, .8 px offsets
         canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
         canvas->translate(SkIntToScalar(50), 0);
         draw_rect_tests(canvas);

         canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
         canvas->translate(SkIntToScalar(50), 0);
         draw_rect_tests(canvas);

         canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
         canvas->translate(SkIntToScalar(50), 0);
         draw_rect_tests(canvas);

         canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
         canvas->translate(SkIntToScalar(50), 0);
         draw_rect_tests(canvas);
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 DEF_GM(return new AAClipGM;)

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

 #ifdef SK_BUILD_FOR_MAC

 static std::unique_ptr<SkCanvas> make_canvas(const SkBitmap& bm) {
     const SkImageInfo& info = bm.info();
     if (info.bytesPerPixel() == 4) {
         return SkCanvas::MakeRasterDirectN32(info.width(), info.height(),
                                              (SkPMColor*)bm.getPixels(),
                                              bm.rowBytes());
     } else {
         return skstd::make_unique<SkCanvas>(bm);
     }
 }

 #include "SkCGUtils.h"
 static void test_image(SkCanvas* canvas, const SkImageInfo& info) {
     SkBitmap bm;
     bm.allocPixels(info);

     if (info.isOpaque()) {
         bm.eraseColor(SK_ColorGREEN);
     } else {
         bm.eraseColor(0);
     }

     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setColor(SK_ColorBLUE);
     make_canvas(bm)->drawCircle(50, 50, 49, paint);
     canvas->drawBitmap(bm, 10, 10);

     CGImageRef image = SkCreateCGImageRefWithColorspace(bm, nullptr);

     SkBitmap bm2;
     SkCreateBitmapFromCGImage(&bm2, image);
     canvas->drawBitmap(bm2, 10, 120);
     canvas->drawImage(SkMakeImageFromCGImage(image), 10, 120 + bm2.height() + 10);

     CGImageRelease(image);
 }

 class CGImageGM : public skiagm::GM {
 public:
     CGImageGM() {}

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

     SkISize onISize() override {
         return SkISize::Make(800, 250);
     }

     void onDraw(SkCanvas* canvas) override {
         const struct {
             SkColorType fCT;
             SkAlphaType fAT;
         } rec[] = {
             { kRGB_565_SkColorType, kOpaque_SkAlphaType },

             { kRGBA_8888_SkColorType, kPremul_SkAlphaType },
             { kRGBA_8888_SkColorType, kUnpremul_SkAlphaType },
             { kRGBA_8888_SkColorType, kOpaque_SkAlphaType },

             { kBGRA_8888_SkColorType, kPremul_SkAlphaType },
             { kBGRA_8888_SkColorType, kUnpremul_SkAlphaType },
             { kBGRA_8888_SkColorType, kOpaque_SkAlphaType },
         };

         for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
             SkImageInfo info = SkImageInfo::Make(100, 100, rec[i].fCT, rec[i].fAT);
             test_image(canvas, info);
             canvas->translate(info.width() + 10, 0);
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 //DEF_GM( return new CGImageGM; )
 #endif

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

 // https://bug.skia.org/3716
 class ClipCubicGM : public skiagm::GM {
     const SkScalar W = 100;
     const SkScalar H = 240;

     SkPath fVPath, fHPath;
 public:
     ClipCubicGM() {
         fVPath.moveTo(W, 0);
         fVPath.cubicTo(W, H-10, 0, 10, 0, H);

         SkMatrix pivot;
         pivot.setRotate(90, W/2, H/2);
         fVPath.transform(pivot, &fHPath);
     }

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

     SkISize onISize() override {
         return SkISize::Make(400, 410);
     }

     void doDraw(SkCanvas* canvas, const SkPath& path) {
         SkPaint paint;
         paint.setAntiAlias(true);

         paint.setColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
         canvas->drawPath(path, paint);

         paint.setColor(SK_ColorRED);
         paint.setStyle(SkPaint::kStroke_Style);
         canvas->drawPath(path, paint);
     }

     void drawAndClip(SkCanvas* canvas, const SkPath& path, SkScalar dx, SkScalar dy) {
         SkAutoCanvasRestore acr(canvas, true);

         SkRect r = SkRect::MakeXYWH(0, H/4, W, H/2);
         SkPaint paint;
         paint.setColor(sk_tool_utils::color_to_565(0xFF8888FF));

         canvas->drawRect(r, paint);
         this->doDraw(canvas, path);

         canvas->translate(dx, dy);

         canvas->drawRect(r, paint);
         canvas->clipRect(r);
         this->doDraw(canvas, path);
     }

     void onDraw(SkCanvas* canvas) override {
         canvas->translate(80, 10);
         this->drawAndClip(canvas, fVPath, 200, 0);
         canvas->translate(0, 200);
         this->drawAndClip(canvas, fHPath, 200, 0);
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM(return new ClipCubicGM;)
	/*
	* 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 "sk_tool_utils.h"
	#include "SkCanvas.h"
	#include "SkPath.h"
	#include "SkMakeUnique.h"

	static void do_draw(SkCanvas* canvas, const SkRect& r) {
	SkPaint paint;
	paint.setBlendMode(SkBlendMode::kSrc);
	paint.setColor(0x800000FF);
	canvas->drawRect(r, paint);
	}

	/**
	* Exercise kDontClipToLayer_Legacy_SaveLayerFlag flag, which does not limit the clip to the
	* layer's bounds. Thus when a draw occurs, it can (depending on "where" it is) draw into the layer
	* and/or draw onto the surrounding portions of the canvas, or both.
	*
	* This GM has a 100x100 rectangle (r), which its going to draw. However first it creates a layer
	* with this flag covering 1/2 of the rectangle (upper half). Then it draws the rect in SRC mode.
	*
	* The portion of the draw that intersects the layer should see the SRC draw, apply it to the layer
	* and then during restore, it will SRC_OVER that layer onto the canvas (SRC_OVER since the layer
	* has no paint, so it gets the default xfermode during restore).
	*
	* Note: when we talk about drawing directly into the "canvas", in fact we are drawing into an
	* "outer" layer we created (filled with red). This is a testing detail, so that our final
	* output image is itself opaque, otherwise we make it harder to view the GM as a PNG.
	*
	* The portion of the draw below the layer draws directly into the canvas. Since it is in SRC mode,
	* it will write 0x80 to the canvas' alpha, overwriting the "red", which then gets blended with
	* the GM's white background.
	*
	* The portion in the layer, will end up SRC_OVERing the 0x80 layer pixels onto the canvas' red
	* pixels, making magenta.
	*
	* Thus the expected result is the upper half to be magenta 0xFF7F0080, and the lower half to be
	* light blue 0xFF7F7FFF.
	*/
	DEF_SIMPLE_GM(dont_clip_to_layer, canvas, 120, 120) {
	const SkRect r { 10, 10, 110, 110 };

	// Wrap the entire test inside a red layer, so we don't punch the actual gm's alpha with
	// kSrc_Mode, which makes it hard to view (we like our GMs to have opaque pixels).
	canvas->saveLayer(&r, nullptr);
	canvas->drawColor(SK_ColorRED);

	SkRect r0 = { 20, 20, 100, 55 };
	SkRect r1 = { 20, 65, 100, 100 };

	SkCanvas::SaveLayerRec rec;
	rec.fPaint = nullptr;
	rec.fBounds = &r0;
	rec.fBackdrop = nullptr;
	rec.fSaveLayerFlags = 1 << 31;//SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag;
	canvas->saveLayer(rec);
	rec.fBounds = &r1;
	canvas->saveLayer(rec);
	do_draw(canvas, r);
	canvas->restore();

	canvas->restore(); // red-layer
	}

	/** Draw a 2px border around the target, then red behind the target;
	set the clip to match the target, then draw >> the target in blue.
	*/

	static void draw(SkCanvas* canvas, SkRect& target, int x, int y) {
	SkPaint borderPaint;
	borderPaint.setColor(SkColorSetRGB(0x0, 0xDD, 0x0));
	borderPaint.setAntiAlias(true);
	SkPaint backgroundPaint;
	backgroundPaint.setColor(SkColorSetRGB(0xDD, 0x0, 0x0));
	backgroundPaint.setAntiAlias(true);
	SkPaint foregroundPaint;
	foregroundPaint.setColor(SkColorSetRGB(0x0, 0x0, 0xDD));
	foregroundPaint.setAntiAlias(true);

	canvas->save();
	canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
	target.inset(SkIntToScalar(-2), SkIntToScalar(-2));
	canvas->drawRect(target, borderPaint);
	target.inset(SkIntToScalar(2), SkIntToScalar(2));
	canvas->drawRect(target, backgroundPaint);
	canvas->clipRect(target, true);
	target.inset(SkIntToScalar(-4), SkIntToScalar(-4));
	canvas->drawRect(target, foregroundPaint);
	canvas->restore();
	}

	static void draw_square(SkCanvas* canvas, int x, int y) {
	SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 10 * SK_Scalar1));
	draw(canvas, target, x, y);
	}

	static void draw_column(SkCanvas* canvas, int x, int y) {
	SkRect target (SkRect::MakeWH(1 * SK_Scalar1, 10 * SK_Scalar1));
	draw(canvas, target, x, y);
	}

	static void draw_bar(SkCanvas* canvas, int x, int y) {
	SkRect target (SkRect::MakeWH(10 * SK_Scalar1, 1 * SK_Scalar1));
	draw(canvas, target, x, y);
	}

	static void draw_rect_tests(SkCanvas* canvas) {
	draw_square(canvas, 10, 10);
	draw_column(canvas, 30, 10);
	draw_bar(canvas, 10, 30);
	}

	/**
	Test a set of clipping problems discovered while writing blitAntiRect,
	and test all the code paths through the clipping blitters.
	Each region should show as a blue center surrounded by a 2px green
	border, with no red.
	*/

	class AAClipGM : public skiagm::GM {
	public:
	AAClipGM() {

	}

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

	SkISize onISize() override {
	return SkISize::Make(240, 120);
	}

	void onDraw(SkCanvas* canvas) override {
	// Initial pixel-boundary-aligned draw
	draw_rect_tests(canvas);

	// Repeat 4x with .2, .4, .6, .8 px offsets
	canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
	canvas->translate(SkIntToScalar(50), 0);
	draw_rect_tests(canvas);

	canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
	canvas->translate(SkIntToScalar(50), 0);
	draw_rect_tests(canvas);

	canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
	canvas->translate(SkIntToScalar(50), 0);
	draw_rect_tests(canvas);

	canvas->translate(SK_Scalar1 / 5, SK_Scalar1 / 5);
	canvas->translate(SkIntToScalar(50), 0);
	draw_rect_tests(canvas);
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	DEF_GM(return new AAClipGM;)

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

	#ifdef SK_BUILD_FOR_MAC

	static std::unique_ptr<SkCanvas> make_canvas(const SkBitmap& bm) {
	const SkImageInfo& info = bm.info();
	if (info.bytesPerPixel() == 4) {
	return SkCanvas::MakeRasterDirectN32(info.width(), info.height(),
	(SkPMColor*)bm.getPixels(),
	bm.rowBytes());
	} else {
	return skstd::make_unique<SkCanvas>(bm);
	}
	}

	#include "SkCGUtils.h"
	static void test_image(SkCanvas* canvas, const SkImageInfo& info) {
	SkBitmap bm;
	bm.allocPixels(info);

	if (info.isOpaque()) {
	bm.eraseColor(SK_ColorGREEN);
	} else {
	bm.eraseColor(0);
	}

	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setColor(SK_ColorBLUE);
	make_canvas(bm)->drawCircle(50, 50, 49, paint);
	canvas->drawBitmap(bm, 10, 10);

	CGImageRef image = SkCreateCGImageRefWithColorspace(bm, nullptr);

	SkBitmap bm2;
	SkCreateBitmapFromCGImage(&bm2, image);
	canvas->drawBitmap(bm2, 10, 120);
	canvas->drawImage(SkMakeImageFromCGImage(image), 10, 120 + bm2.height() + 10);

	CGImageRelease(image);
	}

	class CGImageGM : public skiagm::GM {
	public:
	CGImageGM() {}

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

	SkISize onISize() override {
	return SkISize::Make(800, 250);
	}

	void onDraw(SkCanvas* canvas) override {
	const struct {
	SkColorType fCT;
	SkAlphaType fAT;
	} rec[] = {
	{ kRGB_565_SkColorType, kOpaque_SkAlphaType },

	{ kRGBA_8888_SkColorType, kPremul_SkAlphaType },
	{ kRGBA_8888_SkColorType, kUnpremul_SkAlphaType },
	{ kRGBA_8888_SkColorType, kOpaque_SkAlphaType },

	{ kBGRA_8888_SkColorType, kPremul_SkAlphaType },
	{ kBGRA_8888_SkColorType, kUnpremul_SkAlphaType },
	{ kBGRA_8888_SkColorType, kOpaque_SkAlphaType },
	};

	for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
	SkImageInfo info = SkImageInfo::Make(100, 100, rec[i].fCT, rec[i].fAT);
	test_image(canvas, info);
	canvas->translate(info.width() + 10, 0);
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	//DEF_GM( return new CGImageGM; )
	#endif

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

	// https://bug.skia.org/3716
	class ClipCubicGM : public skiagm::GM {
	const SkScalar W = 100;
	const SkScalar H = 240;

	SkPath fVPath, fHPath;
	public:
	ClipCubicGM() {
	fVPath.moveTo(W, 0);
	fVPath.cubicTo(W, H-10, 0, 10, 0, H);

	SkMatrix pivot;
	pivot.setRotate(90, W/2, H/2);
	fVPath.transform(pivot, &fHPath);
	}

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

	SkISize onISize() override {
	return SkISize::Make(400, 410);
	}

	void doDraw(SkCanvas* canvas, const SkPath& path) {
	SkPaint paint;
	paint.setAntiAlias(true);

	paint.setColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
	canvas->drawPath(path, paint);

	paint.setColor(SK_ColorRED);
	paint.setStyle(SkPaint::kStroke_Style);
	canvas->drawPath(path, paint);
	}

	void drawAndClip(SkCanvas* canvas, const SkPath& path, SkScalar dx, SkScalar dy) {
	SkAutoCanvasRestore acr(canvas, true);

	SkRect r = SkRect::MakeXYWH(0, H/4, W, H/2);
	SkPaint paint;
	paint.setColor(sk_tool_utils::color_to_565(0xFF8888FF));

	canvas->drawRect(r, paint);
	this->doDraw(canvas, path);

	canvas->translate(dx, dy);

	canvas->drawRect(r, paint);
	canvas->clipRect(r);
	this->doDraw(canvas, path);
	}

	void onDraw(SkCanvas* canvas) override {
	canvas->translate(80, 10);
	this->drawAndClip(canvas, fVPath, 200, 0);
	canvas->translate(0, 200);
	this->drawAndClip(canvas, fHPath, 200, 0);
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	DEF_GM(return new ClipCubicGM;)