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skia2/gm/fontmgr.cpp
John Stiles acf7164587 Fix cases of variable shadowing in /gm/. 
If we manage to fix all the existing cases of variable shadowing, we
could enable -Wshadow.

Change-Id: I905459bf0bbaa205da7dc59e1910e345bed2af51
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438538
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2021-08-13 03:35:15 +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 acr2(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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