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SkFontMgr for Android.

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R=djsollen@google.com, tomhudson@google.com

Author: bungeman@google.com

Review URL: https://codereview.chromium.org/414483002
This commit is contained in:
bungeman 2014-07-22 12:07:14 -07:00 committed by Commit bot
parent be035702f3
commit 4f9a01e03e
5 changed files with 447 additions and 6 deletions
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1
gyp/ports.gyp
View File

@ -185,6 +185,7 @@
'../src/ports/SkFontConfigInterface_android.cpp',
'../src/ports/SkFontConfigParser_android.cpp',
'../src/ports/SkFontHost_fontconfig.cpp',
'../src/ports/SkFontMgr_android.cpp',
],
'dependencies': [
'android_deps.gyp:expat',

5
src/ports/SkFontConfigInterface_android.cpp
View File

@ -907,8 +907,3 @@ SkTypeface* SkCreateTypefaceForScript(hb_script_t script, SkTypeface::Style styl
#endif
///////////////////////////////////////////////////////////////////////////////
SkFontMgr* SkFontMgr::Factory() {
return NULL;
}

35
src/ports/SkFontConfigParser_android.cpp
View File

@ -7,12 +7,15 @@
#include "SkFontConfigParser_android.h"
#include "SkTDArray.h"
#include "SkTSearch.h"
#include "SkTypeface.h"
#include <expat.h>
#include <stdio.h>
#include <sys/system_properties.h>
#include <limits>
#define SYSTEM_FONTS_FILE "/system/etc/system_fonts.xml"
#define FALLBACK_FONTS_FILE "/system/etc/fallback_fonts.xml"
#define VENDOR_FONTS_FILE "/vendor/etc/fallback_fonts.xml"
@ -48,13 +51,14 @@ struct FamilyData {
* or file tag. The resulting strings are put into the fNames or FontFileInfo arrays.
*/
static void textHandler(void *data, const char *s, int len) {
SkAutoAsciiToLC tolc(s);
FamilyData *familyData = (FamilyData*) data;
// Make sure we're in the right state to store this name information
if (familyData->currentFamily &&
(familyData->currentTag == NAMESET_TAG || familyData->currentTag == FILESET_TAG)) {
switch (familyData->currentTag) {
case NAMESET_TAG:
familyData->currentFamily->fNames.push_back().set(s, len);
familyData->currentFamily->fNames.push_back().set(tolc.lc(), len);
break;
case FILESET_TAG:
if (familyData->currentFontInfo) {
@ -68,6 +72,28 @@ static void textHandler(void *data, const char *s, int len) {
}
}
/** http://www.w3.org/TR/html-markup/datatypes.html#common.data.integer.non-negative-def */
template <typename T> static bool parseNonNegativeInteger(const char* s, T* value) {
SK_COMPILE_ASSERT(std::numeric_limits<T>::is_integer, T_must_be_integer);
const T nMax = std::numeric_limits<T>::max() / 10;
const T dMax = std::numeric_limits<T>::max() - (nMax * 10);
T n = 0;
for (; *s; ++s) {
// Check if digit
if (*s < '0' || '9' < *s) {
return false;
}
int d = *s - '0';
// Check for overflow
if (n > nMax || (n == nMax && d > dMax)) {
return false;
}
n = (n * 10) + d;
}
*value = n;
return true;
}
/**
* Handler for font files. This processes the attributes for language and
* variants then lets textHandler handle the actual file name
@ -90,6 +116,13 @@ static void fontFileElementHandler(FamilyData *familyData, const char **attribut
}
} else if (strncmp(attributeName, "lang", nameLength) == 0) {
newFileInfo.fPaintOptions.setLanguage(attributeValue);
} else if (strncmp(attributeName, "index", nameLength) == 0) {
int value;
if (parseNonNegativeInteger(attributeValue, &value)) {
newFileInfo.fIndex = value;
} else {
SkDebugf("---- SystemFonts index=%s (INVALID)", attributeValue);
}
}
//each element is a pair of attributeName/attributeValue string pairs
currentAttributeIndex += 2;

3
src/ports/SkFontConfigParser_android.h
View File

@ -15,7 +15,10 @@
#include "SkTDArray.h"
struct FontFileInfo {
FontFileInfo() : fIndex(0) { }
SkString fFileName;
int fIndex;
SkPaintOptionsAndroid fPaintOptions;
};

409
src/ports/SkFontMgr_android.cpp Normal file
View File

@ -0,0 +1,409 @@
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFontConfigParser_android.h"
#include "SkFontDescriptor.h"
#include "SkFontHost_FreeType_common.h"
#include "SkFontMgr.h"
#include "SkFontStyle.h"
#include "SkStream.h"
#include "SkTDArray.h"
#include "SkTSearch.h"
#include "SkTypeface.h"
#include "SkTypefaceCache.h"
#include <limits>
#include <stdlib.h>
#ifndef SK_FONT_FILE_PREFIX
# define SK_FONT_FILE_PREFIX "/fonts/"
#endif
#ifndef SK_DEBUG_FONTS
#define SK_DEBUG_FONTS 0
#endif
#if SK_DEBUG_FONTS
# define DEBUG_FONT(args) SkDebugf args
#else
# define DEBUG_FONT(args)
#endif
class SkTypeface_Android : public SkTypeface_FreeType {
public:
SkTypeface_Android(int index,
Style style,
bool isFixedPitch,
const SkString familyName)
: INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch)
, fIndex(index)
, fFamilyName(familyName)
{ }
const SkString& name() const { return fFamilyName; }
protected:
int fIndex;
SkString fFamilyName;
private:
typedef SkTypeface_FreeType INHERITED;
};
class SkTypeface_AndroidSystem : public SkTypeface_Android {
public:
SkTypeface_AndroidSystem(const SkString pathName,
int index,
Style style,
bool isFixedPitch,
const SkString familyName)
: INHERITED(index, style, isFixedPitch, familyName)
, fPathName(pathName)
{ }
virtual void onGetFontDescriptor(SkFontDescriptor* desc,
bool* serialize) const SK_OVERRIDE
{
SkASSERT(desc);
SkASSERT(serialize);
desc->setFamilyName(fFamilyName.c_str());
desc->setFontFileName(fPathName.c_str());
*serialize = false;
}
virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
*ttcIndex = fIndex;
return SkStream::NewFromFile(fPathName.c_str());
}
private:
SkString fPathName;
typedef SkTypeface_Android INHERITED;
};
class SkTypeface_AndroidStream : public SkTypeface_Android {
public:
SkTypeface_AndroidStream(SkStream* stream,
int index,
Style style,
bool isFixedPitch,
const SkString familyName)
: INHERITED(index, style, isFixedPitch, familyName)
, fStream(stream)
{ }
virtual void onGetFontDescriptor(SkFontDescriptor* desc,
bool* serialize) const SK_OVERRIDE {
SkASSERT(desc);
SkASSERT(serialize);
desc->setFamilyName(fFamilyName.c_str());
desc->setFontFileName(NULL);
*serialize = true;
}
virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
*ttcIndex = fIndex;
return fStream->duplicate();
}
private:
SkAutoTUnref<SkStream> fStream;
typedef SkTypeface_Android INHERITED;
};
void get_path_for_sys_fonts(SkString* full, const SkString& name) {
full->set(getenv("ANDROID_ROOT"));
full->append(SK_FONT_FILE_PREFIX);
full->append(name);
}
class SkFontStyleSet_Android : public SkFontStyleSet {
public:
explicit SkFontStyleSet_Android(FontFamily* family) : fFontFamily(family) {
// TODO? make this lazy
for (int i = 0; i < family->fFontFiles.count(); ++i) {
const SkString& fileName = family->fFontFiles[i].fFileName;
SkString pathName;
get_path_for_sys_fonts(&pathName, fileName);
SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(pathName.c_str()));
if (!stream.get()) {
DEBUG_FONT(("---- SystemFonts[%d] file=%s (NOT EXIST)", i, filename.c_str()));
continue;
}
SkString fontName;
SkTypeface::Style style;
bool isFixedWidth;
if (!SkTypeface_FreeType::ScanFont(stream.get(), family->fFontFiles[i].fIndex,
&fontName, &style, &isFixedWidth))
{
DEBUG_FONT(("---- SystemFonts[%d] file=%s (INVALID)", i, filename.c_str()));
continue;
}
fStyles.push_back().reset(SkNEW_ARGS(SkTypeface_AndroidSystem,
(pathName, 0,
style, isFixedWidth, fontName)));
}
}
virtual int count() SK_OVERRIDE {
return fStyles.count();
}
virtual void getStyle(int index, SkFontStyle* style, SkString* name) SK_OVERRIDE {
if (index < 0 || fStyles.count() <= index) {
return;
}
if (style) {
*style = this->style(index);
}
if (name) {
name->reset();
}
}
virtual SkTypeface* createTypeface(int index) SK_OVERRIDE {
if (index < 0 || fStyles.count() <= index) {
return NULL;
}
return SkRef(fStyles[index].get());
}
/** Find the typeface in this style set that most closely matches the given pattern.
* TODO: consider replacing with SkStyleSet_Indirect::matchStyle();
* this simpler version using match_score() passes all our tests.
*/
virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE {
if (0 == fStyles.count()) {
return NULL;
}
SkTypeface* closest = fStyles[0];
int minScore = std::numeric_limits<int>::max();
for (int i = 0; i < fStyles.count(); ++i) {
SkFontStyle style = this->style(i);
int score = match_score(pattern, style);
if (score < minScore) {
closest = fStyles[i];
minScore = score;
}
}
return SkRef(closest);
}
private:
SkFontStyle style(int index) {
return SkFontStyle(this->weight(index), SkFontStyle::kNormal_Width,
this->slant(index));
}
SkFontStyle::Weight weight(int index) {
if (fStyles[index]->isBold()) return SkFontStyle::kBold_Weight;
return SkFontStyle::kNormal_Weight;
}
SkFontStyle::Slant slant(int index) {
if (fStyles[index]->isItalic()) return SkFontStyle::kItalic_Slant;
return SkFontStyle::kUpright_Slant;
}
static int match_score(const SkFontStyle& pattern, const SkFontStyle& candidate) {
int score = 0;
score += abs((pattern.width() - candidate.width()) * 100);
score += abs((pattern.isItalic() == candidate.isItalic()) ? 0 : 1000);
score += abs(pattern.weight() - candidate.weight());
return score;
}
FontFamily* fFontFamily;
SkTArray<SkAutoTUnref<SkTypeface>, true> fStyles;
friend struct NameToFamily;
friend class SkFontMgr_Android;
typedef SkFontStyleSet INHERITED;
};
/** On Android a single family can have many names, but our API assumes unique names.
* Map names to the back end so that all names for a given family refer to the same
* (non-replicated) set of typefaces.
* SkTDict<> doesn't let us do index-based lookup, so we write our own mapping.
*/
struct NameToFamily {
SkString name;
SkFontStyleSet_Android* styleSet;
};
class SkFontMgr_Android : public SkFontMgr {
public:
SkFontMgr_Android() {
SkTDArray<FontFamily*> fontFamilies;
SkFontConfigParser::GetFontFamilies(fontFamilies);
this->buildNameToFamilyMap(fontFamilies);
this->findDefaultFont();
}
protected:
/** Returns not how many families we have, but how many unique names
* exist among the families.
*/
virtual int onCountFamilies() const SK_OVERRIDE {
return fNameToFamilyMap.count();
}
virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
if (index < 0 || fNameToFamilyMap.count() <= index) {
familyName->reset();
return;
}
familyName->set(fNameToFamilyMap[index].name);
}
virtual SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE {
if (index < 0 || fNameToFamilyMap.count() <= index) {
return NULL;
}
return SkRef(fNameToFamilyMap[index].styleSet);
}
virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const SK_OVERRIDE {
if (!familyName) {
return NULL;
}
SkAutoAsciiToLC tolc(familyName);
for (int i = 0; i < fNameToFamilyMap.count(); ++i) {
if (fNameToFamilyMap[i].name.equals(tolc.lc())) {
return SkRef(fNameToFamilyMap[i].styleSet);
}
}
return NULL;
}
virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
const SkFontStyle& style) const SK_OVERRIDE {
SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName));
return sset->matchStyle(style);
}
virtual SkTypeface* onMatchFaceStyle(const SkTypeface* typeface,
const SkFontStyle& style) const SK_OVERRIDE {
for (int i = 0; i < fFontStyleSets.count(); ++i) {
for (int j = 0; j < fFontStyleSets[i]->fStyles.count(); ++j) {
if (fFontStyleSets[i]->fStyles[j] == typeface) {
return fFontStyleSets[i]->matchStyle(style);
}
}
}
return NULL;
}
virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OVERRIDE {
SkAutoTUnref<SkStream> stream(new SkMemoryStream(data));
return this->createFromStream(stream, ttcIndex);
}
virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE {
SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL;
}
virtual SkTypeface* onCreateFromStream(SkStream* s, int ttcIndex) const SK_OVERRIDE {
SkAutoTUnref<SkStream> stream(s);
bool isFixedPitch;
SkTypeface::Style style;
SkString name;
if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
return NULL;
}
return SkNEW_ARGS(SkTypeface_AndroidStream, (stream.detach(), ttcIndex,
style, isFixedPitch, name));
}
virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
unsigned styleBits) const SK_OVERRIDE {
SkTypeface::Style oldStyle = (SkTypeface::Style)styleBits;
SkFontStyle style = SkFontStyle(oldStyle & SkTypeface::kBold
? SkFontStyle::kBold_Weight
: SkFontStyle::kNormal_Weight,
SkFontStyle::kNormal_Width,
oldStyle & SkTypeface::kItalic
? SkFontStyle::kItalic_Slant
: SkFontStyle::kUpright_Slant);
SkTypeface* tf = NULL;
if (NULL != familyName) {
// On Android, we must return NULL when we can't find the requested
// named typeface so that the system/app can provide their own recovery
// mechanism. On other platforms we'd provide a typeface from the
// default family instead.
tf = this->onMatchFamilyStyle(familyName, style);
} else {
tf = fDefaultFamily->matchStyle(style);
}
// TODO: double ref? qv matchStyle()
return SkSafeRef(tf);
}
private:
SkTArray<SkAutoTUnref<SkFontStyleSet_Android>, true> fFontStyleSets;
SkFontStyleSet* fDefaultFamily;
SkTypeface* fDefaultTypeface;
SkTDArray<NameToFamily> fNameToFamilyMap;
void buildNameToFamilyMap(SkTDArray<FontFamily*> families) {
for (int i = 0; i < families.count(); i++) {
fFontStyleSets.push_back().reset(
SkNEW_ARGS(SkFontStyleSet_Android, (families[i])));
for (int j = 0; j < families[i]->fNames.count(); j++) {
NameToFamily* nextEntry = fNameToFamilyMap.append();
SkNEW_PLACEMENT_ARGS(&nextEntry->name, SkString, (families[i]->fNames[j]));
nextEntry->styleSet = fFontStyleSets.back().get();
}
}
}
void findDefaultFont() {
SkASSERT(!fFontStyleSets.empty());
static const char* gDefaultNames[] = { "sans-serif" };
for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); ++i) {
SkFontStyleSet* set = this->onMatchFamily(gDefaultNames[i]);
if (NULL == set) {
continue;
}
SkTypeface* tf = set->matchStyle(SkFontStyle());
if (NULL == tf) {
continue;
}
fDefaultFamily = set;
fDefaultTypeface = tf;
break;
}
if (NULL == fDefaultTypeface) {
fDefaultFamily = fFontStyleSets[0];
fDefaultTypeface = fDefaultFamily->createTypeface(0);
}
SkASSERT(fDefaultFamily);
SkASSERT(fDefaultTypeface);
}
typedef SkFontMgr INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
SkFontMgr* SkFontMgr::Factory() {
return SkNEW(SkFontMgr_Android);
}