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skia2/gm/fontmgr.cpp
Ben Wagner 1968473fea Move fontmgr_bounds labels to tight bounds 
The font bounds may be empty, so label the tight bounds instead,
especially since the labels are of the glyph id that touches that edge
of the tight bounds. Also rotate the labels so they dont' run into each
other.

This also fixes SkMetaData::set so that changing an existing value
doesn't cause strange issues with iterators or attempt to use data from
the previous rec after it's been freed. (Found by running viewer in a
asan build.)

Change-Id: Id255beff5d05310f098bd14baf0935e5fd349e7e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/312494
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2020-08-24 15:02:44 +00:00

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/*
* 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/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontMetrics.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkGraphics.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkDashPathEffect.h"
#include "src/core/SkFontPriv.h"
#include "tools/SkMetaData.h"
#include "tools/ToolUtils.h"
#include <utility>
// 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 SkFont& font) {
canvas->drawString(text, x, y, font, SkPaint());
return x + font.measureText(text.c_str(), text.size(), SkTextEncoding::kUTF8);
}
static SkScalar drawCharacter(SkCanvas* canvas, uint32_t character, SkScalar x,
SkScalar y, const SkFont& origFont, SkFontMgr* fm,
const char* fontName, const char* bcp47[], int bcp47Count,
const SkFontStyle& fontStyle) {
SkFont font = origFont;
// 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));
font.setTypeface(typeface);
x = drawString(canvas, ch, x, y, font) + 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);
font.setTypeface(fm->legacyMakeTypeface(familyName.c_str(), typeface->fontStyle()));
return drawString(canvas, ch, x, y, font) + 20;
}
static const char* zh = "zh";
static const char* ja = "ja";
class FontMgrGM : public skiagm::GM {
sk_sp<SkFontMgr> fFM;
void onOnceBeforeDraw() override {
SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);
fFM = SkFontMgr::RefDefault();
}
SkString onShortName() override { return SkString("fontmgr_iter"); }
SkISize onISize() override { return {1536, 768}; }
void onDraw(SkCanvas* canvas) override {
SkScalar y = 20;
SkFont font;
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
font.setSubpixel(true);
font.setSize(17);
SkFontMgr* fm = fFM.get();
int count = std::min(fm->countFamilies(), MAX_FAMILIES);
for (int i = 0; i < count; ++i) {
SkString familyName;
fm->getFamilyName(i, &familyName);
font.setTypeface(nullptr);
(void)drawString(canvas, familyName, 20, y, font);
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());
font.setTypeface(sk_sp<SkTypeface>(set->createTypeface(j)));
x = drawString(canvas, sname, x, y, font) + 20;
// check to see that we get different glyphs in japanese and chinese
x = drawCharacter(canvas, 0x5203, x, y, font, fm, familyName.c_str(), &zh, 1, fs);
x = drawCharacter(canvas, 0x5203, x, y, font, fm, familyName.c_str(), &ja, 1, fs);
// check that emoji characters are found
x = drawCharacter(canvas, 0x1f601, x, y, font, fm, familyName.c_str(), nullptr,0, fs);
}
y += 24;
}
}
};
class FontMgrMatchGM : public skiagm::GM {
sk_sp<SkFontMgr> fFM;
void onOnceBeforeDraw() override {
fFM = SkFontMgr::RefDefault();
SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);
}
SkString onShortName() override { return SkString("fontmgr_match"); }
SkISize onISize() override { return {640, 1024}; }
void iterateFamily(SkCanvas* canvas, const SkFont& font, SkFontStyleSet* fset) {
SkFont f(font);
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());
f.setTypeface(sk_sp<SkTypeface>(fset->createTypeface(j)));
(void)drawString(canvas, sname, 0, y, f);
y += 24;
}
}
void exploreFamily(SkCanvas* canvas, const SkFont& font, SkFontStyleSet* fset) {
SkFont f(font);
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());
f.setTypeface(std::move(face));
(void)drawString(canvas, str, 0, y, f);
y += 24;
}
}
}
}
DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
SkFont font;
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
font.setSubpixel(true);
font.setSize(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()) {
*errorMsg = "No SkFontStyleSet";
return DrawResult::kFail;
}
canvas->translate(20, 40);
this->exploreFamily(canvas, font, fset.get());
canvas->translate(150, 0);
this->iterateFamily(canvas, font, fset.get());
return DrawResult::kOk;
}
};
class FontMgrBoundsGM : public skiagm::GM {
public:
FontMgrBoundsGM(float scale, float skew) : fScaleX(scale) , fSkewX(skew) {}
private:
SkString onShortName() override {
if (fScaleX != 1 || fSkewX != 0) {
return SkStringPrintf("fontmgr_bounds_%g_%g", fScaleX, fSkewX);
}
return SkString("fontmgr_bounds");
}
void onOnceBeforeDraw() override {
fFM = SkFontMgr::RefDefault();
}
bool onGetControls(SkMetaData* controls) override {
controls->setBool("Label Bounds", fLabelBounds);
return true;
}
void onSetControls(const SkMetaData& controls) override {
controls.findBool("Label Bounds", &fLabelBounds);
}
static SkRect show_bounds(SkCanvas* canvas, const SkFont& font, SkScalar x, SkScalar y,
SkColor boundsColor, bool labelBounds)
{
SkGlyphID left = 0, right = 0, top = 0, bottom = 0;
SkRect min = SkRect::MakeLTRB(SK_ScalarInfinity, SK_ScalarInfinity,
SK_ScalarNegativeInfinity, SK_ScalarNegativeInfinity);
{
int numGlyphs = font.getTypefaceOrDefault()->countGlyphs();
for (int i = 0; i < numGlyphs; ++i) {
SkGlyphID glyphId = i;
SkRect cur;
font.getBounds(&glyphId, 1, &cur, nullptr);
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; }
}
}
SkRect fontBounds = SkFontPriv::GetFontBounds(font);
SkRect drawBounds = min;
drawBounds.join(fontBounds);
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(x - drawBounds.left(), y);
SkPaint boundsPaint;
boundsPaint.setAntiAlias(true);
boundsPaint.setColor(boundsColor);
boundsPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(fontBounds, boundsPaint);
const SkScalar intervals[] = { 10.f, 10.f };
boundsPaint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0.f));
canvas->drawRect(min, boundsPaint);
SkFontMetrics fm;
font.getMetrics(&fm);
SkPaint metricsPaint(boundsPaint);
metricsPaint.setStyle(SkPaint::kFill_Style);
metricsPaint.setAlphaf(0.25f);
if ((fm.fFlags & SkFontMetrics::kUnderlinePositionIsValid_Flag) &&
(fm.fFlags & SkFontMetrics::kUnderlineThicknessIsValid_Flag))
{
SkRect underline{ min.fLeft, fm.fUnderlinePosition,
min.fRight, fm.fUnderlinePosition + fm.fUnderlineThickness };
canvas->drawRect(underline, metricsPaint);
}
if ((fm.fFlags & SkFontMetrics::kStrikeoutPositionIsValid_Flag) &&
(fm.fFlags & SkFontMetrics::kStrikeoutThicknessIsValid_Flag))
{
SkRect strikeout{ min.fLeft, fm.fStrikeoutPosition - fm.fStrikeoutThickness,
min.fRight, fm.fStrikeoutPosition };
canvas->drawRect(strikeout, metricsPaint);
}
struct GlyphToDraw {
SkGlyphID id;
SkPoint location;
SkScalar rotation;
} glyphsToDraw [] = {
{left, {min.left(), min.centerY()}, 270},
{right, {min.right(), min.centerY()}, 90},
{top, {min.centerX(), min.top() }, 0},
{bottom, {min.centerX(), min.bottom() }, 180},
};
SkFont labelFont;
labelFont.setEdging(SkFont::Edging::kAntiAlias);
labelFont.setTypeface(ToolUtils::create_portable_typeface());
if (labelBounds) {
SkString name;
font.getTypefaceOrDefault()->getFamilyName(&name);
canvas->drawString(name, min.fLeft, min.fBottom, labelFont, SkPaint());
}
for (const GlyphToDraw& glyphToDraw : glyphsToDraw) {
SkPath path;
font.getPath(glyphToDraw.id, &path);
SkPaint::Style style = path.isEmpty() ? SkPaint::kFill_Style : SkPaint::kStroke_Style;
SkPaint glyphPaint;
glyphPaint.setStyle(style);
canvas->drawSimpleText(&glyphToDraw.id, sizeof(glyphToDraw.id),
SkTextEncoding::kGlyphID, 0, 0, font, glyphPaint);
if (labelBounds) {
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(glyphToDraw.location.fX, glyphToDraw.location.fY);
canvas->rotate(glyphToDraw.rotation);
SkString glyphStr;
glyphStr.appendS32(glyphToDraw.id);
canvas->drawString(glyphStr, 0, 0, labelFont, SkPaint());
}
}
return drawBounds;
}
SkISize onISize() override { return {1024, 850}; }
void onDraw(SkCanvas* canvas) override {
SkFont font;
font.setEdging(SkFont::Edging::kAntiAlias);
font.setSubpixel(true);
font.setSize(100);
font.setScaleX(fScaleX);
font.setSkewX(fSkewX);
const SkColor boundsColors[2] = { SK_ColorRED, SK_ColorBLUE };
SkFontMgr* fm = fFM.get();
int count = std::min(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) {
font.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.
SkTypeface* typeface = font.getTypefaceOrDefault();
if (typeface && 0 < typeface->countGlyphs() && typeface->countGlyphs() < 1000) {
SkColor color = boundsColors[index & 1];
SkRect drawBounds = show_bounds(canvas, font, x, y, color, fLabelBounds);
x += drawBounds.width() + 20;
index += 1;
if (x > 900) {
x = 0;
y += 160;
}
if (y >= 700) {
return;
}
}
}
}
}
sk_sp<SkFontMgr> fFM;
const SkScalar fScaleX;
const SkScalar fSkewX;
bool fLabelBounds = false;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new FontMgrGM;)
DEF_GM(return new FontMgrMatchGM;)
DEF_GM(return new FontMgrBoundsGM(1, 0);)
DEF_GM(return new FontMgrBoundsGM(0.75f, 0);)
DEF_GM(return new FontMgrBoundsGM(1, -0.25f);)
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