gm/fontmgr.cpp - platform/external/skia - 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 "SkCanvas.h"
 #include "SkCommonFlags.h"
 #include "SkFontMgr.h"
 #include "SkPath.h"
 #include "SkGraphics.h"
 #include "SkTypeface.h"

 // limit this just so we don't take too long to draw
 #define MAX_FAMILIES    30

 static SkScalar drawString(SkCanvas* canvas, const SkString& text, SkScalar x,
                            SkScalar y, const SkPaint& paint) {
     canvas->drawString(text, x, y, paint);
     return x + paint.measureText(text.c_str(), text.size());
 }

 static SkScalar drawCharacter(SkCanvas* canvas, uint32_t character, SkScalar x,
                               SkScalar y, SkPaint& paint, SkFontMgr* fm,
                               const char* fontName, const char* bcp47[], int bcp47Count,
                               const SkFontStyle& fontStyle) {
     // find typeface containing the requested character and draw it
     SkString ch;
     ch.appendUnichar(character);
     sk_sp<SkTypeface> typeface(fm->matchFamilyStyleCharacter(fontName, fontStyle,
                                                              bcp47, bcp47Count, character));
     paint.setTypeface(typeface);
     x = drawString(canvas, ch, x, y, paint) + 20;

     if (nullptr == typeface) {
         return x;
     }

     // repeat the process, but this time use the family name of the typeface
     // from the first pass.  This emulates the behavior in Blink where it
     // it expects to get the same glyph when following this pattern.
     SkString familyName;
     typeface->getFamilyName(&familyName);
     paint.setTypeface(fm->legacyMakeTypeface(familyName.c_str(), typeface->fontStyle()));
     return drawString(canvas, ch, x, y, paint) + 20;
 }

 static const char* zh = "zh";
 static const char* ja = "ja";

 class FontMgrGM : public skiagm::GM {
 public:
     FontMgrGM() {
         SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);

         fName.set("fontmgr_iter");
         fFM = SkFontMgr::RefDefault();
         fName.append(sk_tool_utils::platform_font_manager());
     }

 protected:
     SkString onShortName() override {
         return fName;
     }

     SkISize onISize() override {
         return SkISize::Make(1536, 768);
     }

     void onDraw(SkCanvas* canvas) override {
         SkScalar y = 20;
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setLCDRenderText(true);
         paint.setSubpixelText(true);
         paint.setTextSize(17);

         SkFontMgr* fm = fFM.get();
         int count = SkMin32(fm->countFamilies(), MAX_FAMILIES);

         for (int i = 0; i < count; ++i) {
             SkString familyName;
             fm->getFamilyName(i, &familyName);
             paint.setTypeface(nullptr);
             (void)drawString(canvas, familyName, 20, y, paint);

             SkScalar x = 220;

             sk_sp<SkFontStyleSet> set(fm->createStyleSet(i));
             for (int j = 0; j < set->count(); ++j) {
                 SkString sname;
                 SkFontStyle fs;
                 set->getStyle(j, &fs, &sname);
                 sname.appendf(" [%d %d %d]", fs.weight(), fs.width(), fs.slant());

                 paint.setTypeface(sk_sp<SkTypeface>(set->createTypeface(j)));
                 x = drawString(canvas, sname, x, y, paint) + 20;

                 // check to see that we get different glyphs in japanese and chinese
                 x = drawCharacter(canvas, 0x5203, x, y, paint, fm, familyName.c_str(), &zh, 1, fs);
                 x = drawCharacter(canvas, 0x5203, x, y, paint, fm, familyName.c_str(), &ja, 1, fs);
                 // check that emoji characters are found
                 x = drawCharacter(canvas, 0x1f601, x, y, paint, fm, familyName.c_str(), nullptr,0, fs);
             }
             y += 24;
         }
     }

 private:
     sk_sp<SkFontMgr> fFM;
     SkString fName;
     typedef GM INHERITED;
 };

 class FontMgrMatchGM : public skiagm::GM {
     sk_sp<SkFontMgr> fFM;

 public:
     FontMgrMatchGM() : fFM(SkFontMgr::RefDefault()) {
         SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);
     }

 protected:
     SkString onShortName() override {
         SkString name("fontmgr_match");
         name.append(sk_tool_utils::platform_font_manager());
         return name;
     }

     SkISize onISize() override {
         return SkISize::Make(640, 1024);
     }

     void iterateFamily(SkCanvas* canvas, const SkPaint& paint,
                        SkFontStyleSet* fset) {
         SkPaint p(paint);
         SkScalar y = 0;

         for (int j = 0; j < fset->count(); ++j) {
             SkString sname;
             SkFontStyle fs;
             fset->getStyle(j, &fs, &sname);

             sname.appendf(" [%d %d]", fs.weight(), fs.width());

             p.setTypeface(sk_sp<SkTypeface>(fset->createTypeface(j)));
             (void)drawString(canvas, sname, 0, y, p);
             y += 24;
         }
     }

     void exploreFamily(SkCanvas* canvas, const SkPaint& paint,
                        SkFontStyleSet* fset) {
         SkPaint p(paint);
         SkScalar y = 0;

         for (int weight = 100; weight <= 900; weight += 200) {
             for (int width = 1; width <= 9; width += 2) {
                 SkFontStyle fs(weight, width, SkFontStyle::kUpright_Slant);
                 sk_sp<SkTypeface> face(fset->matchStyle(fs));
                 if (face) {
                     SkString str;
                     str.printf("request [%d %d]", fs.weight(), fs.width());
                     p.setTypeface(std::move(face));
                     (void)drawString(canvas, str, 0, y, p);
                     y += 24;
                 }
             }
         }
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setLCDRenderText(true);
         paint.setSubpixelText(true);
         paint.setTextSize(17);

         const char* gNames[] = {
             "Helvetica Neue", "Arial", "sans"
         };

         sk_sp<SkFontStyleSet> fset;
         for (size_t i = 0; i < SK_ARRAY_COUNT(gNames); ++i) {
             fset.reset(fFM->matchFamily(gNames[i]));
             if (fset->count() > 0) {
                 break;
             }
         }
         if (nullptr == fset.get()) {
             return;
         }

         canvas->translate(20, 40);
         this->exploreFamily(canvas, paint, fset.get());
         canvas->translate(150, 0);
         this->iterateFamily(canvas, paint, fset.get());
     }

 private:
     typedef GM INHERITED;
 };

 class FontMgrBoundsGM : public skiagm::GM {
 public:
     FontMgrBoundsGM(double scale, double skew)
         : fScaleX(SkDoubleToScalar(scale))
         , fSkewX(SkDoubleToScalar(skew))
     {
         fName.set("fontmgr_bounds");
         if (scale != 1 || skew != 0) {
             fName.appendf("_%g_%g", scale, skew);
         }
         fName.append(sk_tool_utils::platform_font_manager());
         fFM = SkFontMgr::RefDefault();
     }

     static void show_bounds(SkCanvas* canvas, const SkPaint& paint, SkScalar x, SkScalar y,
                             SkColor boundsColor)
     {
         SkPaint glyphPaint(paint);
         SkRect fontBounds = glyphPaint.getFontBounds();
         fontBounds.offset(x, y);
         SkPaint boundsPaint(glyphPaint);
         boundsPaint.setColor(boundsColor);
         boundsPaint.setStyle(SkPaint::kStroke_Style);
         canvas->drawRect(fontBounds, boundsPaint);

         SkPaint::FontMetrics fm;
         glyphPaint.getFontMetrics(&fm);
         SkPaint metricsPaint(boundsPaint);
         metricsPaint.setStyle(SkPaint::kFill_Style);
         metricsPaint.setAlpha(0x40);
         if ((fm.fFlags & SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag) &&
             (fm.fFlags & SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag))
         {
             SkRect underline{ fontBounds.fLeft,  fm.fUnderlinePosition+y,
                               fontBounds.fRight, fm.fUnderlinePosition+y + fm.fUnderlineThickness };
             canvas->drawRect(underline, metricsPaint);
         }

         if ((fm.fFlags & SkPaint::FontMetrics::kStrikeoutPositionIsValid_Flag) &&
             (fm.fFlags & SkPaint::FontMetrics::kStrikeoutPositionIsValid_Flag))
         {
             SkRect strikeout{ fontBounds.fLeft,  fm.fStrikeoutPosition+y - fm.fStrikeoutThickness,
                               fontBounds.fRight, fm.fStrikeoutPosition+y };
             canvas->drawRect(strikeout, metricsPaint);
         }

         SkGlyphID left = 0, right = 0, top = 0, bottom = 0;
         {
             int numGlyphs = glyphPaint.getTypeface()->countGlyphs();
             SkRect min = {0, 0, 0, 0};
             glyphPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
             for (int i = 0; i < numGlyphs; ++i) {
                 SkGlyphID glyphId = i;
                 SkRect cur;
                 glyphPaint.measureText(&glyphId, sizeof(glyphId), &cur);
                 if (cur.fLeft   < min.fLeft  ) { min.fLeft   = cur.fLeft;   left   = i; }
                 if (cur.fTop    < min.fTop   ) { min.fTop    = cur.fTop ;   top    = i; }
                 if (min.fRight  < cur.fRight ) { min.fRight  = cur.fRight;  right  = i; }
                 if (min.fBottom < cur.fBottom) { min.fBottom = cur.fBottom; bottom = i; }
             }
         }
         SkGlyphID str[] = { left, right, top, bottom };
         SkPoint location[] = {
             {fontBounds.left(), fontBounds.centerY()},
             {fontBounds.right(), fontBounds.centerY()},
             {fontBounds.centerX(), fontBounds.top()},
             {fontBounds.centerX(), fontBounds.bottom()}
         };

         SkPaint labelPaint;
         labelPaint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&labelPaint);
         if (FLAGS_veryVerbose) {
             SkString name;
             paint.getTypeface()->getFamilyName(&name);
             canvas->drawText(name.c_str(), name.size(),
                              fontBounds.fLeft, fontBounds.fBottom, labelPaint);
         }
         for (size_t i = 0; i < SK_ARRAY_COUNT(str); ++i) {
             SkPath path;
             glyphPaint.getTextPath(&str[i], sizeof(str[0]), x, y, &path);
             SkPaint::Style style = path.isEmpty() ? SkPaint::kFill_Style : SkPaint::kStroke_Style;
             glyphPaint.setStyle(style);
             canvas->drawText(&str[i], sizeof(str[0]), x, y, glyphPaint);

             if (FLAGS_veryVerbose) {
                 SkString glyphStr;
                 glyphStr.appendS32(str[i]);
                 canvas->drawText(glyphStr.c_str(), glyphStr.size(),
                                  location[i].fX, location[i].fY, labelPaint);
             }

         }

     }

 protected:
     SkString onShortName() override {
         return fName;
     }

     SkISize onISize() override {
         return SkISize::Make(1024, 850);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setSubpixelText(true);
         paint.setTextSize(100);
         paint.setTextScaleX(fScaleX);
         paint.setTextSkewX(fSkewX);

         const SkColor boundsColors[2] = { SK_ColorRED, SK_ColorBLUE };

         SkFontMgr* fm = fFM.get();
         int count = SkMin32(fm->countFamilies(), 32);

         int index = 0;
         SkScalar x = 0, y = 0;

         canvas->translate(10, 120);

         for (int i = 0; i < count; ++i) {
             sk_sp<SkFontStyleSet> set(fm->createStyleSet(i));
             for (int j = 0; j < set->count() && j < 3; ++j) {
                 paint.setTypeface(sk_sp<SkTypeface>(set->createTypeface(j)));
                 // Fonts with lots of glyphs are interesting, but can take a long time to find
                 // the glyphs which make up the maximum extent.
                 if (paint.getTypeface() && paint.getTypeface()->countGlyphs() < 1000) {
                     SkRect fontBounds = paint.getFontBounds();
                     x -= fontBounds.fLeft;
                     show_bounds(canvas, paint, x, y, boundsColors[index & 1]);
                     x += fontBounds.fRight + 20;
                     index += 1;
                     if (x > 900) {
                         x = 0;
                         y += 160;
                     }
                     if (y >= 700) {
                         return;
                     }
                 }
             }
         }
     }

 private:
     sk_sp<SkFontMgr> fFM;
     SkString fName;
     SkScalar fScaleX, fSkewX;
     typedef GM INHERITED;
 };

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

 DEF_GM(return new FontMgrGM;)
 DEF_GM(return new FontMgrMatchGM;)
 DEF_GM(return new FontMgrBoundsGM(1.0, 0);)
 DEF_GM(return new FontMgrBoundsGM(0.75, 0);)
 DEF_GM(return new FontMgrBoundsGM(1.0, -0.25);)
	/*
	* 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 "SkCanvas.h"
	#include "SkCommonFlags.h"
	#include "SkFontMgr.h"
	#include "SkPath.h"
	#include "SkGraphics.h"
	#include "SkTypeface.h"

	// limit this just so we don't take too long to draw
	#define MAX_FAMILIES 30

	static SkScalar drawString(SkCanvas* canvas, const SkString& text, SkScalar x,
	SkScalar y, const SkPaint& paint) {
	canvas->drawString(text, x, y, paint);
	return x + paint.measureText(text.c_str(), text.size());
	}

	static SkScalar drawCharacter(SkCanvas* canvas, uint32_t character, SkScalar x,
	SkScalar y, SkPaint& paint, SkFontMgr* fm,
	const char* fontName, const char* bcp47[], int bcp47Count,
	const SkFontStyle& fontStyle) {
	// find typeface containing the requested character and draw it
	SkString ch;
	ch.appendUnichar(character);
	sk_sp<SkTypeface> typeface(fm->matchFamilyStyleCharacter(fontName, fontStyle,
	bcp47, bcp47Count, character));
	paint.setTypeface(typeface);
	x = drawString(canvas, ch, x, y, paint) + 20;

	if (nullptr == typeface) {
	return x;
	}

	// repeat the process, but this time use the family name of the typeface
	// from the first pass. This emulates the behavior in Blink where it
	// it expects to get the same glyph when following this pattern.
	SkString familyName;
	typeface->getFamilyName(&familyName);
	paint.setTypeface(fm->legacyMakeTypeface(familyName.c_str(), typeface->fontStyle()));
	return drawString(canvas, ch, x, y, paint) + 20;
	}

	static const char* zh = "zh";
	static const char* ja = "ja";

	class FontMgrGM : public skiagm::GM {
	public:
	FontMgrGM() {
	SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);

	fName.set("fontmgr_iter");
	fFM = SkFontMgr::RefDefault();
	fName.append(sk_tool_utils::platform_font_manager());
	}

	protected:
	SkString onShortName() override {
	return fName;
	}

	SkISize onISize() override {
	return SkISize::Make(1536, 768);
	}

	void onDraw(SkCanvas* canvas) override {
	SkScalar y = 20;
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setLCDRenderText(true);
	paint.setSubpixelText(true);
	paint.setTextSize(17);

	SkFontMgr* fm = fFM.get();
	int count = SkMin32(fm->countFamilies(), MAX_FAMILIES);

	for (int i = 0; i < count; ++i) {
	SkString familyName;
	fm->getFamilyName(i, &familyName);
	paint.setTypeface(nullptr);
	(void)drawString(canvas, familyName, 20, y, paint);

	SkScalar x = 220;

	sk_sp<SkFontStyleSet> set(fm->createStyleSet(i));
	for (int j = 0; j < set->count(); ++j) {
	SkString sname;
	SkFontStyle fs;
	set->getStyle(j, &fs, &sname);
	sname.appendf(" [%d %d %d]", fs.weight(), fs.width(), fs.slant());

	paint.setTypeface(sk_sp<SkTypeface>(set->createTypeface(j)));
	x = drawString(canvas, sname, x, y, paint) + 20;

	// check to see that we get different glyphs in japanese and chinese
	x = drawCharacter(canvas, 0x5203, x, y, paint, fm, familyName.c_str(), &zh, 1, fs);
	x = drawCharacter(canvas, 0x5203, x, y, paint, fm, familyName.c_str(), &ja, 1, fs);
	// check that emoji characters are found
	x = drawCharacter(canvas, 0x1f601, x, y, paint, fm, familyName.c_str(), nullptr,0, fs);
	}
	y += 24;
	}
	}

	private:
	sk_sp<SkFontMgr> fFM;
	SkString fName;
	typedef GM INHERITED;
	};

	class FontMgrMatchGM : public skiagm::GM {
	sk_sp<SkFontMgr> fFM;

	public:
	FontMgrMatchGM() : fFM(SkFontMgr::RefDefault()) {
	SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);
	}

	protected:
	SkString onShortName() override {
	SkString name("fontmgr_match");
	name.append(sk_tool_utils::platform_font_manager());
	return name;
	}

	SkISize onISize() override {
	return SkISize::Make(640, 1024);
	}

	void iterateFamily(SkCanvas* canvas, const SkPaint& paint,
	SkFontStyleSet* fset) {
	SkPaint p(paint);
	SkScalar y = 0;

	for (int j = 0; j < fset->count(); ++j) {
	SkString sname;
	SkFontStyle fs;
	fset->getStyle(j, &fs, &sname);

	sname.appendf(" [%d %d]", fs.weight(), fs.width());

	p.setTypeface(sk_sp<SkTypeface>(fset->createTypeface(j)));
	(void)drawString(canvas, sname, 0, y, p);
	y += 24;
	}
	}

	void exploreFamily(SkCanvas* canvas, const SkPaint& paint,
	SkFontStyleSet* fset) {
	SkPaint p(paint);
	SkScalar y = 0;

	for (int weight = 100; weight <= 900; weight += 200) {
	for (int width = 1; width <= 9; width += 2) {
	SkFontStyle fs(weight, width, SkFontStyle::kUpright_Slant);
	sk_sp<SkTypeface> face(fset->matchStyle(fs));
	if (face) {
	SkString str;
	str.printf("request [%d %d]", fs.weight(), fs.width());
	p.setTypeface(std::move(face));
	(void)drawString(canvas, str, 0, y, p);
	y += 24;
	}
	}
	}
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setLCDRenderText(true);
	paint.setSubpixelText(true);
	paint.setTextSize(17);

	const char* gNames[] = {
	"Helvetica Neue", "Arial", "sans"
	};

	sk_sp<SkFontStyleSet> fset;
	for (size_t i = 0; i < SK_ARRAY_COUNT(gNames); ++i) {
	fset.reset(fFM->matchFamily(gNames[i]));
	if (fset->count() > 0) {
	break;
	}
	}
	if (nullptr == fset.get()) {
	return;
	}

	canvas->translate(20, 40);
	this->exploreFamily(canvas, paint, fset.get());
	canvas->translate(150, 0);
	this->iterateFamily(canvas, paint, fset.get());
	}

	private:
	typedef GM INHERITED;
	};

	class FontMgrBoundsGM : public skiagm::GM {
	public:
	FontMgrBoundsGM(double scale, double skew)
	: fScaleX(SkDoubleToScalar(scale))
	, fSkewX(SkDoubleToScalar(skew))
	{
	fName.set("fontmgr_bounds");
	if (scale != 1 \|\| skew != 0) {
	fName.appendf("_%g_%g", scale, skew);
	}
	fName.append(sk_tool_utils::platform_font_manager());
	fFM = SkFontMgr::RefDefault();
	}

	static void show_bounds(SkCanvas* canvas, const SkPaint& paint, SkScalar x, SkScalar y,
	SkColor boundsColor)
	{
	SkPaint glyphPaint(paint);
	SkRect fontBounds = glyphPaint.getFontBounds();
	fontBounds.offset(x, y);
	SkPaint boundsPaint(glyphPaint);
	boundsPaint.setColor(boundsColor);
	boundsPaint.setStyle(SkPaint::kStroke_Style);
	canvas->drawRect(fontBounds, boundsPaint);

	SkPaint::FontMetrics fm;
	glyphPaint.getFontMetrics(&fm);
	SkPaint metricsPaint(boundsPaint);
	metricsPaint.setStyle(SkPaint::kFill_Style);
	metricsPaint.setAlpha(0x40);
	if ((fm.fFlags & SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag) &&
	(fm.fFlags & SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag))
	{
	SkRect underline{ fontBounds.fLeft, fm.fUnderlinePosition+y,
	fontBounds.fRight, fm.fUnderlinePosition+y + fm.fUnderlineThickness };
	canvas->drawRect(underline, metricsPaint);
	}

	if ((fm.fFlags & SkPaint::FontMetrics::kStrikeoutPositionIsValid_Flag) &&
	(fm.fFlags & SkPaint::FontMetrics::kStrikeoutPositionIsValid_Flag))
	{
	SkRect strikeout{ fontBounds.fLeft, fm.fStrikeoutPosition+y - fm.fStrikeoutThickness,
	fontBounds.fRight, fm.fStrikeoutPosition+y };
	canvas->drawRect(strikeout, metricsPaint);
	}

	SkGlyphID left = 0, right = 0, top = 0, bottom = 0;
	{
	int numGlyphs = glyphPaint.getTypeface()->countGlyphs();
	SkRect min = {0, 0, 0, 0};
	glyphPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
	for (int i = 0; i < numGlyphs; ++i) {
	SkGlyphID glyphId = i;
	SkRect cur;
	glyphPaint.measureText(&glyphId, sizeof(glyphId), &cur);
	if (cur.fLeft < min.fLeft ) { min.fLeft = cur.fLeft; left = i; }
	if (cur.fTop < min.fTop ) { min.fTop = cur.fTop ; top = i; }
	if (min.fRight < cur.fRight ) { min.fRight = cur.fRight; right = i; }
	if (min.fBottom < cur.fBottom) { min.fBottom = cur.fBottom; bottom = i; }
	}
	}
	SkGlyphID str[] = { left, right, top, bottom };
	SkPoint location[] = {
	{fontBounds.left(), fontBounds.centerY()},
	{fontBounds.right(), fontBounds.centerY()},
	{fontBounds.centerX(), fontBounds.top()},
	{fontBounds.centerX(), fontBounds.bottom()}
	};

	SkPaint labelPaint;
	labelPaint.setAntiAlias(true);
	sk_tool_utils::set_portable_typeface(&labelPaint);
	if (FLAGS_veryVerbose) {
	SkString name;
	paint.getTypeface()->getFamilyName(&name);
	canvas->drawText(name.c_str(), name.size(),
	fontBounds.fLeft, fontBounds.fBottom, labelPaint);
	}
	for (size_t i = 0; i < SK_ARRAY_COUNT(str); ++i) {
	SkPath path;
	glyphPaint.getTextPath(&str[i], sizeof(str[0]), x, y, &path);
	SkPaint::Style style = path.isEmpty() ? SkPaint::kFill_Style : SkPaint::kStroke_Style;
	glyphPaint.setStyle(style);
	canvas->drawText(&str[i], sizeof(str[0]), x, y, glyphPaint);

	if (FLAGS_veryVerbose) {
	SkString glyphStr;
	glyphStr.appendS32(str[i]);
	canvas->drawText(glyphStr.c_str(), glyphStr.size(),
	location[i].fX, location[i].fY, labelPaint);
	}

	}

	}

	protected:
	SkString onShortName() override {
	return fName;
	}

	SkISize onISize() override {
	return SkISize::Make(1024, 850);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setSubpixelText(true);
	paint.setTextSize(100);
	paint.setTextScaleX(fScaleX);
	paint.setTextSkewX(fSkewX);

	const SkColor boundsColors[2] = { SK_ColorRED, SK_ColorBLUE };

	SkFontMgr* fm = fFM.get();
	int count = SkMin32(fm->countFamilies(), 32);

	int index = 0;
	SkScalar x = 0, y = 0;

	canvas->translate(10, 120);

	for (int i = 0; i < count; ++i) {
	sk_sp<SkFontStyleSet> set(fm->createStyleSet(i));
	for (int j = 0; j < set->count() && j < 3; ++j) {
	paint.setTypeface(sk_sp<SkTypeface>(set->createTypeface(j)));
	// Fonts with lots of glyphs are interesting, but can take a long time to find
	// the glyphs which make up the maximum extent.
	if (paint.getTypeface() && paint.getTypeface()->countGlyphs() < 1000) {
	SkRect fontBounds = paint.getFontBounds();
	x -= fontBounds.fLeft;
	show_bounds(canvas, paint, x, y, boundsColors[index & 1]);
	x += fontBounds.fRight + 20;
	index += 1;
	if (x > 900) {
	x = 0;
	y += 160;
	}
	if (y >= 700) {
	return;
	}
	}
	}
	}
	}

	private:
	sk_sp<SkFontMgr> fFM;
	SkString fName;
	SkScalar fScaleX, fSkewX;
	typedef GM INHERITED;
	};

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

	DEF_GM(return new FontMgrGM;)
	DEF_GM(return new FontMgrMatchGM;)
	DEF_GM(return new FontMgrBoundsGM(1.0, 0);)
	DEF_GM(return new FontMgrBoundsGM(0.75, 0);)
	DEF_GM(return new FontMgrBoundsGM(1.0, -0.25);)