From 381bb43efb1697a67b1c02d1d9774fef9c643c4b Mon Sep 17 00:00:00 2001 From: "reed@google.com" Date: Mon, 13 May 2013 19:43:59 +0000 Subject: add separate impl file for SkFontMgr_fontconfig, so we don't polute SkFontHost_fontconfig, which should be sharable w/ android. Eventaully we will remove that FontHost file completely, and just use the SkFontMgr. R=djsollen@google.com Review URL: https://codereview.chromium.org/15077008 git-svn-id: http://skia.googlecode.com/svn/trunk@9114 2bbb7eff-a529-9590-31e7-b0007b416f81 --- src/fonts/SkFontMgr_fontconfig.cpp | 276 +++++++++++++++++++++++++++++++++++++ 1 file changed, 276 insertions(+) create mode 100644 src/fonts/SkFontMgr_fontconfig.cpp (limited to 'src/fonts/SkFontMgr_fontconfig.cpp') diff --git a/src/fonts/SkFontMgr_fontconfig.cpp b/src/fonts/SkFontMgr_fontconfig.cpp new file mode 100644 index 0000000000..e93e9f8e93 --- /dev/null +++ b/src/fonts/SkFontMgr_fontconfig.cpp @@ -0,0 +1,276 @@ +/* + * 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 "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 +#include + +// 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 fFCI; + SkDataTable* fFamilyNames; + + void init() { + if (!fFamilyNames) { + fFamilyNames = fFCI->getFamilyNames(); + } + } + +public: + SkFontMgr_fontconfig(SkFontConfigInterface* fci) + : fFCI(fci) + , fFamilyNames(NULL) {} + + virtual ~SkFontMgr_fontconfig() { + SkSafeUnref(fFamilyNames); + } + +protected: + virtual int onCountFamilies() { + this->init(); + return fFamilyNames->count(); + } + + virtual void onGetFamilyName(int index, SkString* familyName) { + this->init(); + familyName->set(fFamilyNames->atStr(index)); + } + + virtual SkFontStyleSet* onCreateStyleSet(int index) { + this->init(); + return this->onMatchFamily(fFamilyNames->atStr(index)); + } + + virtual SkFontStyleSet* onMatchFamily(const char familyName[]) { + this->init(); + + 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 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&) { return NULL; } + virtual SkTypeface* onMatchFaceStyle(const SkTypeface*, + const SkFontStyle&) { return NULL; } + + virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) { return NULL; } + virtual SkTypeface* onCreateFromStream(SkStream*, int ttcIndex) { + return NULL; + } + virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) { + return NULL; + } +}; + +SkFontMgr* SkFontMgr::Factory() { + SkFontConfigInterface* fci = RefFCI(); + return fci ? SkNEW_ARGS(SkFontMgr_fontconfig, (fci)) : NULL; +} + -- cgit v1.2.3