blob: 5e93bf8a6208522c600bedca95d02529a3f7f570 [file] [log] [blame]
/*
* 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 "SkTypeface_android.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
// For test only.
static const char* gTestMainConfigFile = NULL;
static const char* gTestFallbackConfigFile = NULL;
static const char* gTestFontFilePrefix = NULL;
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) { }
protected:
virtual void onGetFamilyName(SkString* familyName) const SK_OVERRIDE {
*familyName = fFamilyName;
}
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,
const SkLanguage& lang,
FontVariant variantStyle)
: INHERITED(index, style, isFixedPitch, familyName)
, fPathName(pathName)
, fLang(lang)
, fVariantStyle(variantStyle) { }
virtual void onGetFontDescriptor(SkFontDescriptor* desc,
bool* serialize) const SK_OVERRIDE {
SkASSERT(desc);
SkASSERT(serialize);
desc->setFamilyName(fFamilyName.c_str());
desc->setFontFileName(fPathName.c_str());
desc->setFontIndex(fIndex);
*serialize = false;
}
virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
*ttcIndex = fIndex;
return SkStream::NewFromFile(fPathName.c_str());
}
const SkString fPathName;
const SkLanguage fLang;
const FontVariant fVariantStyle;
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(SkRef(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(const char* basePath, const SkString& name, SkString* full) {
if (basePath) {
full->set(basePath);
} else {
full->set(getenv("ANDROID_ROOT"));
full->append(SK_FONT_FILE_PREFIX);
}
full->append(name);
}
class SkFontStyleSet_Android : public SkFontStyleSet {
public:
explicit SkFontStyleSet_Android(const FontFamily& family, const char* basePath) {
const SkString* cannonicalFamilyName = NULL;
if (family.fNames.count() > 0) {
cannonicalFamilyName = &family.fNames[0];
}
// TODO? make this lazy
for (int i = 0; i < family.fFonts.count(); ++i) {
const FontFileInfo& fontFile = family.fFonts[i];
SkString pathName;
get_path_for_sys_fonts(basePath, fontFile.fFileName, &pathName);
SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(pathName.c_str()));
if (!stream.get()) {
DEBUG_FONT(("---- SystemFonts[%d] file=%s (NOT EXIST)", i, pathName.c_str()));
continue;
}
const int ttcIndex = fontFile.fIndex;
SkString familyName;
SkTypeface::Style style;
bool isFixedWidth;
if (!SkTypeface_FreeType::ScanFont(stream.get(), ttcIndex,
&familyName, &style, &isFixedWidth)) {
DEBUG_FONT(("---- SystemFonts[%d] file=%s (INVALID)", i, pathName.c_str()));
continue;
}
const SkLanguage& lang = family.fLanguage;
uint32_t variant = family.fVariant;
if (kDefault_FontVariant == variant) {
variant = kCompact_FontVariant | kElegant_FontVariant;
}
// The first specified family name overrides the family name found in the font.
// TODO: SkTypeface_AndroidSystem::onCreateFamilyNameIterator should return
// all of the specified family names in addition to the names found in the font.
if (cannonicalFamilyName != NULL) {
familyName = *cannonicalFamilyName;
}
fStyles.push_back().reset(SkNEW_ARGS(SkTypeface_AndroidSystem,
(pathName, ttcIndex,
style, isFixedWidth, familyName,
lang, variant)));
}
}
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_AndroidSystem* 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_AndroidSystem* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE {
if (0 == fStyles.count()) {
return NULL;
}
SkTypeface_AndroidSystem* 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;
}
SkTArray<SkAutoTUnref<SkTypeface_AndroidSystem>, 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, NULL);
this->findDefaultFont();
}
SkFontMgr_Android(const char* mainConfigFile, const char* fallbackConfigFile,
const char* basePath)
{
SkTDArray<FontFamily*> fontFamilies;
SkFontConfigParser::GetTestFontFamilies(fontFamilies, mainConfigFile, fallbackConfigFile);
this->buildNameToFamilyMap(fontFamilies, basePath);
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);
}
}
// TODO: eventually we should not need to name fallback families.
for (int i = 0; i < fFallbackNameToFamilyMap.count(); ++i) {
if (fFallbackNameToFamilyMap[i].name.equals(tolc.lc())) {
return SkRef(fFallbackNameToFamilyMap[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* onMatchFamilyStyleCharacter(const char familyName[],
const SkFontStyle& style,
const char bpc47[],
uint32_t character) const SK_OVERRIDE
{
// The variant 'elegant' is 'not squashed', 'compact' is 'stays in ascent/descent'.
// The variant 'default' means 'compact and elegant'.
// As a result, it is not possible to know the variant context from the font alone.
// TODO: add 'is_elegant' and 'is_compact' bits to 'style' request.
// For compatibility, try 'elegant' fonts first in fallback.
uint32_t variantMask = kElegant_FontVariant;
// The first time match anything in the mask, second time anything not in the mask.
for (bool maskMatches = true; maskMatches != false; maskMatches = false) {
SkLanguage lang(bpc47);
// Match against the language, removing a segment each time.
// The last time through the loop, the language will be empty.
// The empty language is special, and matches all languages.
do {
const SkString& langTag = lang.getTag();
for (int i = 0; i < fFallbackNameToFamilyMap.count(); ++i) {
SkFontStyleSet_Android* family = fFallbackNameToFamilyMap[i].styleSet;
SkAutoTUnref<SkTypeface_AndroidSystem> face(family->matchStyle(style));
if (!langTag.isEmpty() && langTag != face->fLang.getTag()) {
continue;
}
if (SkToBool(face->fVariantStyle & variantMask) != maskMatches) {
continue;
}
SkPaint paint;
paint.setTypeface(face);
paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
uint16_t glyphID;
paint.textToGlyphs(&character, sizeof(character), &glyphID);
if (glyphID != 0) {
return face.detach();
}
}
} while (!lang.getTag().isEmpty() && (lang = lang.getParent(), true));
}
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* stream, int ttcIndex) const SK_OVERRIDE {
bool isFixedPitch;
SkTypeface::Style style;
SkString name;
if (!SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
return NULL;
}
return SkNEW_ARGS(SkTypeface_AndroidStream, (stream, 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);
if (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.
return this->onMatchFamilyStyle(familyName, style);
}
return fDefaultFamily->matchStyle(style);
}
private:
SkTArray<SkAutoTUnref<SkFontStyleSet_Android>, true> fFontStyleSets;
SkFontStyleSet* fDefaultFamily;
SkTypeface* fDefaultTypeface;
SkTDArray<NameToFamily> fNameToFamilyMap;
SkTDArray<NameToFamily> fFallbackNameToFamilyMap;
void buildNameToFamilyMap(SkTDArray<FontFamily*> families, const char* basePath) {
for (int i = 0; i < families.count(); i++) {
FontFamily& family = *families[i];
SkTDArray<NameToFamily>* nameToFamily = &fNameToFamilyMap;
if (family.fIsFallbackFont) {
nameToFamily = &fFallbackNameToFamilyMap;
if (0 == family.fNames.count()) {
SkString& fallbackName = family.fNames.push_back();
fallbackName.printf("%.2x##fallback", i);
}
}
SkFontStyleSet_Android* newSet = SkNEW_ARGS(SkFontStyleSet_Android, (family, basePath));
if (0 == newSet->count()) {
SkDELETE(newSet);
continue;
}
fFontStyleSets.push_back().reset(newSet);
for (int j = 0; j < family.fNames.count(); j++) {
NameToFamily* nextEntry = nameToFamily->append();
SkNEW_PLACEMENT_ARGS(&nextEntry->name, SkString, (family.fNames[j]));
nextEntry->styleSet = newSet;
}
}
}
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() {
// The call to SkGetTestFontConfiguration is so that Chromium can override the environment.
// TODO: these globals need to be removed, in favor of a constructor / separate Factory
// which can be used instead.
const char* mainConfigFile;
const char* fallbackConfigFile;
const char* basePath;
SkGetTestFontConfiguration(&mainConfigFile, &fallbackConfigFile, &basePath);
if (mainConfigFile) {
return SkNEW_ARGS(SkFontMgr_Android, (mainConfigFile, fallbackConfigFile, basePath));
}
return SkNEW(SkFontMgr_Android);
}
void SkUseTestFontConfigFile(const char* mainconf, const char* fallbackconf,
const char* fontsdir) {
gTestMainConfigFile = mainconf;
gTestFallbackConfigFile = fallbackconf;
gTestFontFilePrefix = fontsdir;
SkASSERT(gTestMainConfigFile);
SkASSERT(gTestFallbackConfigFile);
SkASSERT(gTestFontFilePrefix);
SkDEBUGF(("Use Test Config File Main %s, Fallback %s, Font Dir %s",
gTestMainConfigFile, gTestFallbackConfigFile, gTestFontFilePrefix));
}
void SkGetTestFontConfiguration(const char** mainconf, const char** fallbackconf,
const char** fontsdir) {
*mainconf = gTestMainConfigFile;
*fallbackconf = gTestFallbackConfigFile;
*fontsdir = gTestFontFilePrefix;
}