The Tor Browser: gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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 "SkFontMgr.h"
 #include "SkFontStyle.h"
 #include "SkFontConfigInterface.h"
 #include "SkFontConfigTypeface.h"
 #include "SkMath.h"
 #include "SkString.h"
 #include "SkTDArray.h"
 // for now we pull these in directly. eventually we will solely rely on the
 // SkFontConfigInterface instance.
 #include <fontconfig/fontconfig.h>
 #include <unistd.h>
 // Defined in SkFontHost_FreeType.cpp
 bool find_name_and_attributes(SkStream* stream, SkString* name,
                               SkTypeface::Style* style, bool* isFixedWidth);
 // borrow this global from SkFontHost_fontconfig. eventually that file should
 // go away, and be replaced with this one.
 extern SkFontConfigInterface* SkFontHost_fontconfig_ref_global();
 static SkFontConfigInterface* RefFCI() {
     return SkFontHost_fontconfig_ref_global();
 }
 // look for the last substring after a '/' and return that, or return null.
 static const char* find_just_name(const char* str) {
     const char* last = strrchr(str, '/');
     return last ? last + 1 : NULL;
 }
 static bool is_lower(char c) {
     return c >= 'a' && c <= 'z';
 }
 static int get_int(FcPattern* pattern, const char field[]) {
     int value;
     if (FcPatternGetInteger(pattern, field, 0, &value) != FcResultMatch) {
         value = SK_MinS32;
     }
     return value;
 }
 static const char* get_name(FcPattern* pattern, const char field[]) {
     const char* name;
     if (FcPatternGetString(pattern, field, 0, (FcChar8**)&name) != FcResultMatch) {
         name = "";
     }
     return name;
 }
 static bool valid_pattern(FcPattern* pattern) {
     FcBool is_scalable;
     if (FcPatternGetBool(pattern, FC_SCALABLE, 0, &is_scalable) != FcResultMatch || !is_scalable) {
         return false;
     }
     // fontconfig can also return fonts which are unreadable
     const char* c_filename = get_name(pattern, FC_FILE);
     if (0 == *c_filename) {
         return false;
     }
     if (access(c_filename, R_OK) != 0) {
         return false;
     }
     return true;
 }
 static bool match_name(FcPattern* pattern, const char family_name[]) {
     return !strcasecmp(family_name, get_name(pattern, FC_FAMILY));
 }
 static FcPattern** MatchFont(FcFontSet* font_set,
                              const char post_config_family[],
                              int* count) {
   // Older versions of fontconfig have a bug where they cannot select
   // only scalable fonts so we have to manually filter the results.
     FcPattern** iter = font_set->fonts;
     FcPattern** stop = iter + font_set->nfont;
     // find the first good match
     for (; iter < stop; ++iter) {
         if (valid_pattern(*iter)) {
             break;
         }
     }
     if (iter == stop || !match_name(*iter, post_config_family)) {
         return NULL;
     }
     FcPattern** firstIter = iter++;
     for (; iter < stop; ++iter) {
         if (!valid_pattern(*iter) || !match_name(*iter, post_config_family)) {
             break;
         }
     }
     *count = iter - firstIter;
     return firstIter;
 }
 class SkFontStyleSet_FC : public SkFontStyleSet {
 public:
     SkFontStyleSet_FC(FcPattern** matches, int count);
     virtual ~SkFontStyleSet_FC();
     virtual int count() SK_OVERRIDE { return fRecCount; }
     virtual void getStyle(int index, SkFontStyle*, SkString* style) SK_OVERRIDE;
     virtual SkTypeface* createTypeface(int index) SK_OVERRIDE;
     virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE;
 private:
     struct Rec {
         SkString    fStyleName;
         SkString    fFileName;
         SkFontStyle fStyle;
     };
     Rec* fRecs;
     int  fRecCount;
 };
 static int map_range(int value,
                      int old_min, int old_max, int new_min, int new_max) {
     SkASSERT(old_min < old_max);
     SkASSERT(new_min < new_max);
     return new_min + SkMulDiv(value - old_min,
                               new_max - new_min, old_max - old_min);
 }
 static SkFontStyle make_fontconfig_style(FcPattern* match) {
     int weight = get_int(match, FC_WEIGHT);
     int width = get_int(match, FC_WIDTH);
     int slant = get_int(match, FC_SLANT);
 //    SkDebugf("old weight %d new weight %d\n", weight, map_range(weight, 0, 80, 0, 400));
     // fontconfig weight seems to be 0..200 or so, so we remap it here
     weight = map_range(weight, 0, 80, 0, 400);
     width = map_range(width, 0, 200, 0, 9);
     return SkFontStyle(weight, width, slant > 0 ? SkFontStyle::kItalic_Slant
                                                 : SkFontStyle::kUpright_Slant);
 }
 SkFontStyleSet_FC::SkFontStyleSet_FC(FcPattern** matches, int count) {
     fRecCount = count;
     fRecs = SkNEW_ARRAY(Rec, count);
     for (int i = 0; i < count; ++i) {
         fRecs[i].fStyleName.set(get_name(matches[i], FC_STYLE));
         fRecs[i].fFileName.set(get_name(matches[i], FC_FILE));
         fRecs[i].fStyle = make_fontconfig_style(matches[i]);
     }
 }
 SkFontStyleSet_FC::~SkFontStyleSet_FC() {
     SkDELETE_ARRAY(fRecs);
 }
 void SkFontStyleSet_FC::getStyle(int index, SkFontStyle* style,
                                  SkString* styleName) {
     SkASSERT((unsigned)index < (unsigned)fRecCount);
     if (style) {
         *style = fRecs[index].fStyle;
     }
     if (styleName) {
         *styleName = fRecs[index].fStyleName;
     }
 }
 SkTypeface* SkFontStyleSet_FC::createTypeface(int index) {
     return NULL;
 }
 SkTypeface* SkFontStyleSet_FC::matchStyle(const SkFontStyle& pattern) {
     return NULL;
 }
 class SkFontMgr_fontconfig : public SkFontMgr {
     SkAutoTUnref<SkFontConfigInterface> fFCI;
     SkDataTable* fFamilyNames;
 public:
     SkFontMgr_fontconfig(SkFontConfigInterface* fci)
         : fFCI(fci)
         , fFamilyNames(fFCI->getFamilyNames()) {}
     virtual ~SkFontMgr_fontconfig() {
         SkSafeUnref(fFamilyNames);
     }
 protected:
     virtual int onCountFamilies() const SK_OVERRIDE {
         return fFamilyNames->count();
     }
     virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
         familyName->set(fFamilyNames->atStr(index));
     }
     virtual SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE {
         return this->onMatchFamily(fFamilyNames->atStr(index));
     }
     virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const SK_OVERRIDE {
         FcPattern* pattern = FcPatternCreate();
         FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName);
 #if 0
         FcPatternAddBool(pattern, FC_SCALABLE, FcTrue);
 #endif
         FcConfigSubstitute(NULL, pattern, FcMatchPattern);
         FcDefaultSubstitute(pattern);
         const char* post_config_family = get_name(pattern, FC_FAMILY);
         FcResult result;
         FcFontSet* font_set = FcFontSort(0, pattern, 0, 0, &result);
         if (!font_set) {
             FcPatternDestroy(pattern);
             return NULL;
         }
         int count;
         FcPattern** match = MatchFont(font_set, post_config_family, &count);
         if (!match) {
             FcPatternDestroy(pattern);
             FcFontSetDestroy(font_set);
             return NULL;
         }
         FcPatternDestroy(pattern);
         SkTDArray<FcPattern*> trimmedMatches;
         for (int i = 0; i < count; ++i) {
             const char* justName = find_just_name(get_name(match[i], FC_FILE));
             if (!is_lower(*justName)) {
                 *trimmedMatches.append() = match[i];
             }
         }
         SkFontStyleSet_FC* sset = SkNEW_ARGS(SkFontStyleSet_FC,
                                              (trimmedMatches.begin(),
                                               trimmedMatches.count()));
         return sset;
     }
     virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
                                            const SkFontStyle&) const SK_OVERRIDE { return NULL; }
     virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
                                          const SkFontStyle&) const SK_OVERRIDE { return NULL; }
     virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const SK_OVERRIDE { return NULL; }
     virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE {
         const size_t length = stream->getLength();
         if (!length) {
             return NULL;
         }
         if (length >= 1024 * 1024 * 1024) {
             return NULL;  // don't accept too large fonts (>= 1GB) for safety.
         }
         // TODO should the caller give us the style or should we get it from freetype?
         SkTypeface::Style style = SkTypeface::kNormal;
         bool isFixedWidth = false;
         if (!find_name_and_attributes(stream, NULL, &style, &isFixedWidth)) {
             return NULL;
         }
         SkTypeface* face = SkNEW_ARGS(FontConfigTypeface, (style, isFixedWidth, stream));
         return face;
     }
     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* onLegacyCreateTypeface(const char familyName[],
                                                unsigned styleBits) const SK_OVERRIDE {
         return FontConfigTypeface::LegacyCreateTypeface(NULL, familyName,
                                                   (SkTypeface::Style)styleBits);
     }
 };
 SkFontMgr* SkFontMgr::Factory() {
     SkFontConfigInterface* fci = RefFCI();
     return fci ? SkNEW_ARGS(SkFontMgr_fontconfig, (fci)) : NULL;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/fonts/SkFontMgr_fontconfig.cpp