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

 /*
  * Copyright 2013 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 "Sk2DPathEffect.h"
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
 #include "SkGraphics.h"
 #include "SkLayerDrawLooper.h"
 #include "SkRandom.h"
 #include "SkTextBlob.h"

 namespace skiagm {

 constexpr int kWidth = 1250;
 constexpr int kHeight = 700;

 // Unlike the variant in sk_tool_utils, this version positions the glyphs on a diagonal
 static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
                              SkScalar x, SkScalar y) {
     SkPaint paint(origPaint);
     SkTDArray<uint16_t> glyphs;

     size_t len = strlen(text);
     glyphs.append(paint.textToGlyphs(text, len, nullptr));
     paint.textToGlyphs(text, len, glyphs.begin());

     const SkScalar advanceX = paint.getTextSize() * 0.85f;
     const SkScalar advanceY = paint.getTextSize() * 1.5f;

     SkTDArray<SkScalar> pos;
     for (unsigned i = 0; i < len; ++i) {
         *pos.append() = x + i * advanceX;
         *pos.append() = y + i * (advanceY / len);
     }

     paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
     const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(paint, glyphs.count());
     memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
     memcpy(run.pos, pos.begin(), len * sizeof(SkScalar) * 2);
 }

 typedef void (*LooperProc)(SkPaint*);

 struct LooperSettings {
     SkBlendMode      fMode;
     SkColor          fColor;
     SkPaint::Style   fStyle;
     SkScalar         fWidth;
     SkScalar         fOffset;
     SkScalar         fSkewX;
     bool             fEffect;
 };

 static void mask_filter(SkPaint* paint) {
     paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
                                                 SkBlurMask::ConvertRadiusToSigma(3.f)));
 }

 static sk_sp<SkPathEffect> make_tile_effect() {
     SkMatrix m;
     m.setScale(1.f, 1.f);

     SkPath path;
     path.addCircle(0, 0, SkIntToScalar(5));

     return SkPath2DPathEffect::Make(m, path);
 }

 static void path_effect(SkPaint* paint) {
     paint->setPathEffect(make_tile_effect());
 }

 static sk_sp<SkShader> make_shader(const SkRect& bounds) {
     const SkPoint pts[] = {
         { bounds.left(), bounds.top() },
         { bounds.right(), bounds.bottom() },
     };
     const SkColor colors[] = {
         SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
         SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
     };
     return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
                                         SkShader::kClamp_TileMode);
 }

 static void color_filter(SkPaint* paint) {
     SkRect r;
     r.setWH(SkIntToScalar(kWidth), 50);
     paint->setShader(make_shader(r));
     paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(0xF0F0F0, 0));
 }

 static void kitchen_sink(SkPaint* paint) {
     color_filter(paint);
     path_effect(paint);
     mask_filter(paint);

 }

 static sk_sp<SkDrawLooper> setupLooper(SkLayerDrawLooper::BitFlags bits,
                                        LooperProc proc,
                                        const LooperSettings settings[],
                                        size_t size) {
     SkLayerDrawLooper::Builder looperBuilder;

     SkLayerDrawLooper::LayerInfo info;
     info.fPaintBits = bits;

     info.fColorMode = SkBlendMode::kSrc;

     for (size_t i = 0; i < size; i++) {
         info.fOffset.set(settings[i].fOffset, settings[i].fOffset);
         SkPaint* paint = looperBuilder.addLayer(info);
         paint->setBlendMode(settings[i].fMode);
         paint->setColor(settings[i].fColor);
         paint->setStyle(settings[i].fStyle);
         paint->setStrokeWidth(settings[i].fWidth);
         if (settings[i].fEffect) {
             (*proc)(paint);
         }
     }
     return looperBuilder.detach();
 }

 class TextBlobLooperGM : public GM {
 public:
     TextBlobLooperGM() {}

 protected:
     void onOnceBeforeDraw() override {
         SkTextBlobBuilder builder;

         // LCD
         SkPaint paint;
         paint.setTextSize(32);
         const char* text = "The quick brown fox jumps over the lazy dog";
         paint.setSubpixelText(true);
         paint.setLCDRenderText(true);
         paint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&paint);
         add_to_text_blob(&builder, text, paint, 0, 0);
         fBlob = builder.make();

         // create a looper which sandwhiches an effect in two normal draws
         LooperSettings looperSandwhich[] = {
            { SkBlendMode::kSrc, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
            { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
            { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
         };

         LooperSettings compound[] = {
             { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
             { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
             { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
             { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
         };

         LooperSettings xfermode[] = {
             { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
             { SkBlendMode::kSrcOver, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
             { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
         };

         // NOTE, this should be ignored by textblobs
         LooperSettings skew[] = {
             { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
             { SkBlendMode::kSrc, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
             { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
         };

         LooperSettings kitchenSink[] = {
             { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
             { SkBlendMode::kSrc, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
             { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
             { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
             { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
         };

         fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
                                        SkLayerDrawLooper::kXfermode_Bit |
                                        SkLayerDrawLooper::kStyle_Bit, &mask_filter,
                                        compound, SK_ARRAY_COUNT(compound)));
         fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit |
                                        SkLayerDrawLooper::kXfermode_Bit, &path_effect,
                                        looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
         fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
                                        SkLayerDrawLooper::kColorFilter_Bit |
                                        SkLayerDrawLooper::kXfermode_Bit, &color_filter,
                                        looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
         fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
                                        SkLayerDrawLooper::kColorFilter_Bit |
                                        SkLayerDrawLooper::kXfermode_Bit, &color_filter,
                                        xfermode, SK_ARRAY_COUNT(xfermode)));
         fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew)));
         fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
                                        SkLayerDrawLooper::kShader_Bit |
                                        SkLayerDrawLooper::kColorFilter_Bit |
                                        SkLayerDrawLooper::kPathEffect_Bit |
                                        SkLayerDrawLooper::kStyle_Bit |
                                        SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink,
                                        kitchenSink, SK_ARRAY_COUNT(kitchenSink)));

         // Test we respect overrides
         fLoopers.push_back(setupLooper(0, &kitchen_sink,
                                        kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
     }

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

     SkISize onISize() override {
         return SkISize::Make(kWidth, kHeight);
     }

     void onDraw(SkCanvas* canvas) override {

         canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));

         SkPaint paint;
         canvas->translate(10, 40);

         paint.setTextSize(40);

         SkRect bounds = fBlob->bounds();

         int y = 0;
         for (int looper = 0; looper < fLoopers.count(); looper++) {
             paint.setLooper(fLoopers[looper]);
             canvas->save();
             canvas->translate(0, SkIntToScalar(y));
             canvas->drawTextBlob(fBlob, 0, 0, paint);
             canvas->restore();
             y += SkScalarFloorToInt(bounds.height());
         }
     }

 private:
     sk_sp<SkTextBlob> fBlob;
     SkTArray<sk_sp<SkDrawLooper>, true> fLoopers;

     typedef GM INHERITED;
 };

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

 DEF_GM(return new TextBlobLooperGM;)
 }
	/*
	* Copyright 2013 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 "Sk2DPathEffect.h"
	#include "SkBlurMask.h"
	#include "SkBlurMaskFilter.h"
	#include "SkColorMatrixFilter.h"
	#include "SkCanvas.h"
	#include "SkGradientShader.h"
	#include "SkGraphics.h"
	#include "SkLayerDrawLooper.h"
	#include "SkRandom.h"
	#include "SkTextBlob.h"

	namespace skiagm {

	constexpr int kWidth = 1250;
	constexpr int kHeight = 700;

	// Unlike the variant in sk_tool_utils, this version positions the glyphs on a diagonal
	static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
	SkScalar x, SkScalar y) {
	SkPaint paint(origPaint);
	SkTDArray<uint16_t> glyphs;

	size_t len = strlen(text);
	glyphs.append(paint.textToGlyphs(text, len, nullptr));
	paint.textToGlyphs(text, len, glyphs.begin());

	const SkScalar advanceX = paint.getTextSize() * 0.85f;
	const SkScalar advanceY = paint.getTextSize() * 1.5f;

	SkTDArray<SkScalar> pos;
	for (unsigned i = 0; i < len; ++i) {
	pos.append() = x + i advanceX;
	pos.append() = y + i (advanceY / len);
	}

	paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
	const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(paint, glyphs.count());
	memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
	memcpy(run.pos, pos.begin(), len * sizeof(SkScalar) * 2);
	}

	typedef void (LooperProc)(SkPaint);

	struct LooperSettings {
	SkBlendMode fMode;
	SkColor fColor;
	SkPaint::Style fStyle;
	SkScalar fWidth;
	SkScalar fOffset;
	SkScalar fSkewX;
	bool fEffect;
	};

	static void mask_filter(SkPaint* paint) {
	paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
	SkBlurMask::ConvertRadiusToSigma(3.f)));
	}

	static sk_sp<SkPathEffect> make_tile_effect() {
	SkMatrix m;
	m.setScale(1.f, 1.f);

	SkPath path;
	path.addCircle(0, 0, SkIntToScalar(5));

	return SkPath2DPathEffect::Make(m, path);
	}

	static void path_effect(SkPaint* paint) {
	paint->setPathEffect(make_tile_effect());
	}

	static sk_sp<SkShader> make_shader(const SkRect& bounds) {
	const SkPoint pts[] = {
	{ bounds.left(), bounds.top() },
	{ bounds.right(), bounds.bottom() },
	};
	const SkColor colors[] = {
	SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
	SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
	};
	return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
	SkShader::kClamp_TileMode);
	}

	static void color_filter(SkPaint* paint) {
	SkRect r;
	r.setWH(SkIntToScalar(kWidth), 50);
	paint->setShader(make_shader(r));
	paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(0xF0F0F0, 0));
	}

	static void kitchen_sink(SkPaint* paint) {
	color_filter(paint);
	path_effect(paint);
	mask_filter(paint);

	}

	static sk_sp<SkDrawLooper> setupLooper(SkLayerDrawLooper::BitFlags bits,
	LooperProc proc,
	const LooperSettings settings[],
	size_t size) {
	SkLayerDrawLooper::Builder looperBuilder;

	SkLayerDrawLooper::LayerInfo info;
	info.fPaintBits = bits;

	info.fColorMode = SkBlendMode::kSrc;

	for (size_t i = 0; i < size; i++) {
	info.fOffset.set(settings[i].fOffset, settings[i].fOffset);
	SkPaint* paint = looperBuilder.addLayer(info);
	paint->setBlendMode(settings[i].fMode);
	paint->setColor(settings[i].fColor);
	paint->setStyle(settings[i].fStyle);
	paint->setStrokeWidth(settings[i].fWidth);
	if (settings[i].fEffect) {
	(*proc)(paint);
	}
	}
	return looperBuilder.detach();
	}

	class TextBlobLooperGM : public GM {
	public:
	TextBlobLooperGM() {}

	protected:
	void onOnceBeforeDraw() override {
	SkTextBlobBuilder builder;

	// LCD
	SkPaint paint;
	paint.setTextSize(32);
	const char* text = "The quick brown fox jumps over the lazy dog";
	paint.setSubpixelText(true);
	paint.setLCDRenderText(true);
	paint.setAntiAlias(true);
	sk_tool_utils::set_portable_typeface(&paint);
	add_to_text_blob(&builder, text, paint, 0, 0);
	fBlob = builder.make();

	// create a looper which sandwhiches an effect in two normal draws
	LooperSettings looperSandwhich[] = {
	{ SkBlendMode::kSrc, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
	{ SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
	{ SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
	};

	LooperSettings compound[] = {
	{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
	{ SkBlendMode::kSrc, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
	{ SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
	{ SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
	};

	LooperSettings xfermode[] = {
	{ SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
	{ SkBlendMode::kSrcOver, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
	{ SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
	};

	// NOTE, this should be ignored by textblobs
	LooperSettings skew[] = {
	{ SkBlendMode::kSrc, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
	{ SkBlendMode::kSrc, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
	{ SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
	};

	LooperSettings kitchenSink[] = {
	{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
	{ SkBlendMode::kSrc, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
	{ SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
	{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
	{ SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
	};

	fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit \|
	SkLayerDrawLooper::kXfermode_Bit \|
	SkLayerDrawLooper::kStyle_Bit, &mask_filter,
	compound, SK_ARRAY_COUNT(compound)));
	fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit \|
	SkLayerDrawLooper::kXfermode_Bit, &path_effect,
	looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
	fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit \|
	SkLayerDrawLooper::kColorFilter_Bit \|
	SkLayerDrawLooper::kXfermode_Bit, &color_filter,
	looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
	fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit \|
	SkLayerDrawLooper::kColorFilter_Bit \|
	SkLayerDrawLooper::kXfermode_Bit, &color_filter,
	xfermode, SK_ARRAY_COUNT(xfermode)));
	fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew)));
	fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit \|
	SkLayerDrawLooper::kShader_Bit \|
	SkLayerDrawLooper::kColorFilter_Bit \|
	SkLayerDrawLooper::kPathEffect_Bit \|
	SkLayerDrawLooper::kStyle_Bit \|
	SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink,
	kitchenSink, SK_ARRAY_COUNT(kitchenSink)));

	// Test we respect overrides
	fLoopers.push_back(setupLooper(0, &kitchen_sink,
	kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
	}

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

	SkISize onISize() override {
	return SkISize::Make(kWidth, kHeight);
	}

	void onDraw(SkCanvas* canvas) override {

	canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));

	SkPaint paint;
	canvas->translate(10, 40);

	paint.setTextSize(40);

	SkRect bounds = fBlob->bounds();

	int y = 0;
	for (int looper = 0; looper < fLoopers.count(); looper++) {
	paint.setLooper(fLoopers[looper]);
	canvas->save();
	canvas->translate(0, SkIntToScalar(y));
	canvas->drawTextBlob(fBlob, 0, 0, paint);
	canvas->restore();
	y += SkScalarFloorToInt(bounds.height());
	}
	}

	private:
	sk_sp<SkTextBlob> fBlob;
	SkTArray<sk_sp<SkDrawLooper>, true> fLoopers;

	typedef GM INHERITED;
	};

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

	DEF_GM(return new TextBlobLooperGM;)
	}