add glyph->unichar query (inverse of a cmap)
git-svn-id: http://skia.googlecode.com/svn/trunk@472 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkPaint.h b/include/core/SkPaint.h
index 9f174fc..86f174a 100644
--- a/include/core/SkPaint.h
+++ b/include/core/SkPaint.h
@@ -708,6 +708,13 @@
int textToGlyphs(const void* text, size_t byteLength,
uint16_t glyphs[]) const;
+ /** Convert the glyph array into Unichars. Unconvertable glyphs are mapped
+ to zero. Note: this does not look at the text-encoding setting in the
+ paint, only at the typeface.
+ */
+ void glyphsToUnichars(const uint16_t glyphs[], int count,
+ SkUnichar text[]) const;
+
/** Return the number of drawable units in the specified text buffer.
This looks at the current TextEncoding field of the paint. If you also
want to have the text converted into glyph IDs, call textToGlyphs
diff --git a/include/core/SkScalerContext.h b/include/core/SkScalerContext.h
index 407985b..6aae316 100644
--- a/include/core/SkScalerContext.h
+++ b/include/core/SkScalerContext.h
@@ -211,6 +211,11 @@
*/
uint16_t charToGlyphID(SkUnichar uni);
+ /** Map the glyphID to its glyph index, and then to its char code. Unmapped
+ glyphs return zero.
+ */
+ SkUnichar glyphIDToChar(uint16_t glyphID);
+
unsigned getGlyphCount() const { return this->generateGlyphCount(); }
void getAdvance(SkGlyph*);
void getMetrics(SkGlyph*);
@@ -234,6 +239,8 @@
virtual void generatePath(const SkGlyph&, SkPath*) = 0;
virtual void generateFontMetrics(SkPaint::FontMetrics* mX,
SkPaint::FontMetrics* mY) = 0;
+ // default impl returns 0, indicating failure.
+ virtual SkUnichar generateGlyphToChar(uint16_t);
private:
SkPathEffect* fPathEffect;
diff --git a/src/core/SkGlyphCache.cpp b/src/core/SkGlyphCache.cpp
index 6b214df..cfd355c 100644
--- a/src/core/SkGlyphCache.cpp
+++ b/src/core/SkGlyphCache.cpp
@@ -128,6 +128,10 @@
}
}
+SkUnichar SkGlyphCache::glyphToUnichar(uint16_t glyphID) {
+ return fScalerContext->glyphIDToChar(glyphID);
+}
+
///////////////////////////////////////////////////////////////////////////////
const SkGlyph& SkGlyphCache::getUnicharAdvance(SkUnichar charCode) {
diff --git a/src/core/SkGlyphCache.h b/src/core/SkGlyphCache.h
index 2462ea5..cc81ed6 100644
--- a/src/core/SkGlyphCache.h
+++ b/src/core/SkGlyphCache.h
@@ -72,6 +72,11 @@
*/
uint16_t unicharToGlyph(SkUnichar);
+ /** Map the glyph to its Unicode equivalent. Unmappable glyphs map to
+ a character code of zero.
+ */
+ SkUnichar glyphToUnichar(uint16_t);
+
/** Return the image associated with the glyph. If it has not been generated
this will trigger that.
*/
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index e4e4ea8..a0fc90d 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -381,6 +381,23 @@
return gptr - glyphs;
}
+void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count,
+ SkUnichar textData[]) const {
+ if (count <= 0) {
+ return;
+ }
+
+ SkASSERT(glyphs != NULL);
+ SkASSERT(textData != NULL);
+
+ SkAutoGlyphCache autoCache(*this, NULL);
+ SkGlyphCache* cache = autoCache.getCache();
+
+ for (int index = 0; index < count; index++) {
+ textData[index] = cache->glyphToUnichar(glyphs[index]);
+ }
+}
+
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_next(SkGlyphCache* cache, const char** text)
diff --git a/src/core/SkScalerContext.cpp b/src/core/SkScalerContext.cpp
index b9cd3ac..b149be9 100644
--- a/src/core/SkScalerContext.cpp
+++ b/src/core/SkScalerContext.cpp
@@ -264,6 +264,21 @@
return SkToU16(glyphID);
}
+SkUnichar SkScalerContext::glyphIDToChar(uint16_t glyphID) {
+ SkScalerContext* ctx = this;
+ unsigned rangeEnd = 0;
+ do {
+ unsigned rangeStart = rangeEnd;
+
+ rangeEnd += ctx->getGlyphCount();
+ if (rangeStart <= glyphID && glyphID < rangeEnd) {
+ return ctx->generateGlyphToChar(glyphID - rangeStart);
+ }
+ ctx = ctx->getNextContext();
+ } while (NULL != ctx);
+ return 0;
+}
+
void SkScalerContext::getAdvance(SkGlyph* glyph) {
// mark us as just having a valid advance
glyph->fMaskFormat = MASK_FORMAT_JUST_ADVANCE;
@@ -508,6 +523,10 @@
this->generateFontMetrics(mx, my);
}
+SkUnichar SkScalerContext::generateGlyphToChar(uint16_t glyph) {
+ return 0;
+}
+
///////////////////////////////////////////////////////////////////////
void SkScalerContext::internalGetPath(const SkGlyph& glyph, SkPath* fillPath, SkPath* devPath, SkMatrix* fillToDevMatrix)
diff --git a/src/ports/SkFontHost_FreeType.cpp b/src/ports/SkFontHost_FreeType.cpp
index d5a48a6..0974b8d 100644
--- a/src/ports/SkFontHost_FreeType.cpp
+++ b/src/ports/SkFontHost_FreeType.cpp
@@ -115,6 +115,7 @@
virtual void generatePath(const SkGlyph& glyph, SkPath* path);
virtual void generateFontMetrics(SkPaint::FontMetrics* mx,
SkPaint::FontMetrics* my);
+ virtual SkUnichar generateGlyphToChar(uint16_t glyph);
private:
SkFaceRec* fFaceRec;
@@ -470,6 +471,21 @@
return SkToU16(FT_Get_Char_Index( fFace, uni ));
}
+SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) {
+ // iterate through each cmap entry, looking for matching glyph indices
+ FT_UInt glyphIndex;
+ SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex );
+
+ while (glyphIndex != 0) {
+ if (glyphIndex == glyph) {
+ return charCode;
+ }
+ charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex );
+ }
+
+ return 0;
+}
+
static FT_Pixel_Mode compute_pixel_mode(SkMask::Format format) {
switch (format) {
case SkMask::kHorizontalLCD_Format:
diff --git a/src/ports/SkFontHost_simple.cpp b/src/ports/SkFontHost_simple.cpp
new file mode 100644
index 0000000..deda04d
--- /dev/null
+++ b/src/ports/SkFontHost_simple.cpp
@@ -0,0 +1,635 @@
+#include "SkFontHost.h"
+#include "SkDescriptor.h"
+#include "SkMMapStream.h"
+#include "SkPaint.h"
+#include "SkString.h"
+#include "SkStream.h"
+#include "SkThread.h"
+#include "SkTSearch.h"
+#include <stdio.h>
+
+#define FONT_CACHE_MEMORY_BUDGET (768 * 1024)
+
+#define SK_FONT_FILE_PREFIX "/skimages/"
+
+SkTypeface::Style find_name_and_style(SkStream* stream, SkString* name);
+
+static void GetFullPathForSysFonts(SkString* full, const char name[]) {
+ full->set(SK_FONT_FILE_PREFIX);
+ full->append(name);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+struct FamilyRec;
+
+/* This guy holds a mapping of a name -> family, used for looking up fonts.
+ Since it is stored in a stretchy array that doesn't preserve object
+ semantics, we don't use constructor/destructors, but just have explicit
+ helpers to manage our internal bookkeeping.
+*/
+struct NameFamilyPair {
+ const char* fName; // we own this
+ FamilyRec* fFamily; // we don't own this, we just reference it
+
+ void construct(const char name[], FamilyRec* family) {
+ fName = strdup(name);
+ fFamily = family; // we don't own this, so just record the referene
+ }
+
+ void destruct() {
+ free((char*)fName);
+ // we don't own family, so just ignore our reference
+ }
+};
+
+// we use atomic_inc to grow this for each typeface we create
+static int32_t gUniqueFontID;
+
+// this is the mutex that protects these globals
+static SkMutex gFamilyMutex;
+static FamilyRec* gFamilyHead;
+static SkTDArray<NameFamilyPair> gNameList;
+
+struct FamilyRec {
+ FamilyRec* fNext;
+ SkTypeface* fFaces[4];
+
+ FamilyRec()
+ {
+ fNext = gFamilyHead;
+ memset(fFaces, 0, sizeof(fFaces));
+ gFamilyHead = this;
+ }
+};
+
+static SkTypeface* find_best_face(const FamilyRec* family,
+ SkTypeface::Style style) {
+ SkTypeface* const* faces = family->fFaces;
+
+ if (faces[style] != NULL) { // exact match
+ return faces[style];
+ }
+ // look for a matching bold
+ style = (SkTypeface::Style)(style ^ SkTypeface::kItalic);
+ if (faces[style] != NULL) {
+ return faces[style];
+ }
+ // look for the plain
+ if (faces[SkTypeface::kNormal] != NULL) {
+ return faces[SkTypeface::kNormal];
+ }
+ // look for anything
+ for (int i = 0; i < 4; i++) {
+ if (faces[i] != NULL) {
+ return faces[i];
+ }
+ }
+ // should never get here, since the faces list should not be empty
+ SkASSERT(!"faces list is empty");
+ return NULL;
+}
+
+static FamilyRec* find_family(const SkTypeface* member) {
+ FamilyRec* curr = gFamilyHead;
+ while (curr != NULL) {
+ for (int i = 0; i < 4; i++) {
+ if (curr->fFaces[i] == member) {
+ return curr;
+ }
+ }
+ curr = curr->fNext;
+ }
+ return NULL;
+}
+
+/* Returns the matching typeface, or NULL. If a typeface is found, its refcnt
+ is not modified.
+ */
+static SkTypeface* find_from_uniqueID(uint32_t uniqueID) {
+ FamilyRec* curr = gFamilyHead;
+ while (curr != NULL) {
+ for (int i = 0; i < 4; i++) {
+ SkTypeface* face = curr->fFaces[i];
+ if (face != NULL && face->uniqueID() == uniqueID) {
+ return face;
+ }
+ }
+ curr = curr->fNext;
+ }
+ return NULL;
+}
+
+/* Remove reference to this face from its family. If the resulting family
+ is empty (has no faces), return that family, otherwise return NULL
+*/
+static FamilyRec* remove_from_family(const SkTypeface* face) {
+ FamilyRec* family = find_family(face);
+ SkASSERT(family->fFaces[face->style()] == face);
+ family->fFaces[face->style()] = NULL;
+
+ for (int i = 0; i < 4; i++) {
+ if (family->fFaces[i] != NULL) { // family is non-empty
+ return NULL;
+ }
+ }
+ return family; // return the empty family
+}
+
+// maybe we should make FamilyRec be doubly-linked
+static void detach_and_delete_family(FamilyRec* family) {
+ FamilyRec* curr = gFamilyHead;
+ FamilyRec* prev = NULL;
+
+ while (curr != NULL) {
+ FamilyRec* next = curr->fNext;
+ if (curr == family) {
+ if (prev == NULL) {
+ gFamilyHead = next;
+ } else {
+ prev->fNext = next;
+ }
+ SkDELETE(family);
+ return;
+ }
+ prev = curr;
+ curr = next;
+ }
+ SkASSERT(!"Yikes, couldn't find family in our list to remove/delete");
+}
+
+static SkTypeface* find_typeface(const char name[], SkTypeface::Style style) {
+ NameFamilyPair* list = gNameList.begin();
+ int count = gNameList.count();
+
+ int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
+
+ if (index >= 0) {
+ return find_best_face(list[index].fFamily, style);
+ }
+ return NULL;
+}
+
+static SkTypeface* find_typeface(const SkTypeface* familyMember,
+ SkTypeface::Style style) {
+ const FamilyRec* family = find_family(familyMember);
+ return family ? find_best_face(family, style) : NULL;
+}
+
+static void add_name(const char name[], FamilyRec* family) {
+ SkAutoAsciiToLC tolc(name);
+ name = tolc.lc();
+
+ NameFamilyPair* list = gNameList.begin();
+ int count = gNameList.count();
+
+ int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
+
+ if (index < 0) {
+ list = gNameList.insert(~index);
+ list->construct(name, family);
+ }
+}
+
+static void remove_from_names(FamilyRec* emptyFamily)
+{
+#ifdef SK_DEBUG
+ for (int i = 0; i < 4; i++) {
+ SkASSERT(emptyFamily->fFaces[i] == NULL);
+ }
+#endif
+
+ SkTDArray<NameFamilyPair>& list = gNameList;
+
+ // must go backwards when removing
+ for (int i = list.count() - 1; i >= 0; --i) {
+ NameFamilyPair* pair = &list[i];
+ if (pair->fFamily == emptyFamily) {
+ pair->destruct();
+ list.remove(i);
+ }
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class FamilyTypeface : public SkTypeface {
+public:
+ FamilyTypeface(Style style, bool sysFont, SkTypeface* familyMember)
+ : SkTypeface(style, sk_atomic_inc(&gUniqueFontID) + 1) {
+ fIsSysFont = sysFont;
+
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ FamilyRec* rec = NULL;
+ if (familyMember) {
+ rec = find_family(familyMember);
+ SkASSERT(rec);
+ } else {
+ rec = SkNEW(FamilyRec);
+ }
+ rec->fFaces[style] = this;
+ }
+
+ virtual ~FamilyTypeface() {
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ // remove us from our family. If the family is now empty, we return
+ // that and then remove that family from the name list
+ FamilyRec* family = remove_from_family(this);
+ if (NULL != family) {
+ remove_from_names(family);
+ detach_and_delete_family(family);
+ }
+ }
+
+ bool isSysFont() const { return fIsSysFont; }
+
+ virtual SkStream* openStream() = 0;
+ virtual const char* getUniqueString() const = 0;
+ virtual const char* getFilePath() const = 0;
+
+private:
+ bool fIsSysFont;
+
+ typedef SkTypeface INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+class StreamTypeface : public FamilyTypeface {
+public:
+ StreamTypeface(Style style, bool sysFont, SkTypeface* familyMember,
+ SkStream* stream)
+ : INHERITED(style, sysFont, familyMember) {
+ SkASSERT(stream);
+ stream->ref();
+ fStream = stream;
+ }
+ virtual ~StreamTypeface() {
+ fStream->unref();
+ }
+
+ // overrides
+ virtual SkStream* openStream() {
+ // we just ref our existing stream, since the caller will call unref()
+ // when they are through
+ fStream->ref();
+ return fStream;
+ }
+ virtual const char* getUniqueString() const { return NULL; }
+ virtual const char* getFilePath() const { return NULL; }
+
+private:
+ SkStream* fStream;
+
+ typedef FamilyTypeface INHERITED;
+};
+
+class FileTypeface : public FamilyTypeface {
+public:
+ FileTypeface(Style style, bool sysFont, SkTypeface* familyMember,
+ const char path[])
+ : INHERITED(style, sysFont, familyMember) {
+ SkString fullpath;
+
+ if (sysFont) {
+ GetFullPathForSysFonts(&fullpath, path);
+ path = fullpath.c_str();
+ }
+ fPath.set(path);
+ }
+
+ // overrides
+ virtual SkStream* openStream() {
+ SkStream* stream = SkNEW_ARGS(SkMMAPStream, (fPath.c_str()));
+
+ // check for failure
+ if (stream->getLength() <= 0) {
+ SkDELETE(stream);
+ // maybe MMAP isn't supported. try FILE
+ stream = SkNEW_ARGS(SkFILEStream, (fPath.c_str()));
+ if (stream->getLength() <= 0) {
+ SkDELETE(stream);
+ stream = NULL;
+ }
+ }
+ return stream;
+ }
+ virtual const char* getUniqueString() const {
+ const char* str = strrchr(fPath.c_str(), '/');
+ if (str) {
+ str += 1; // skip the '/'
+ }
+ return str;
+ }
+ virtual const char* getFilePath() const {
+ return fPath.c_str();
+ }
+
+private:
+ SkString fPath;
+
+ typedef FamilyTypeface INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+
+static bool get_name_and_style(const char path[], SkString* name,
+ SkTypeface::Style* style, bool isExpected) {
+ SkString fullpath;
+ GetFullPathForSysFonts(&fullpath, path);
+
+ SkMMAPStream stream(fullpath.c_str());
+ if (stream.getLength() > 0) {
+ *style = find_name_and_style(&stream, name);
+ return true;
+ }
+ else {
+ SkFILEStream stream(fullpath.c_str());
+ if (stream.getLength() > 0) {
+ *style = find_name_and_style(&stream, name);
+ return true;
+ }
+ }
+
+ if (isExpected) {
+ SkDebugf("---- failed to open <%s> as a font\n", fullpath.c_str());
+ }
+ return false;
+}
+
+// used to record our notion of the pre-existing fonts
+struct FontInitRec {
+ const char* fFileName;
+ const char* const* fNames; // null-terminated list
+};
+
+static const char* gSansNames[] = {
+ "sans-serif", "arial", "helvetica", "tahoma", "verdana", NULL
+};
+
+static const char* gSerifNames[] = {
+ "serif", "times", "times new roman", "palatino", "georgia", "baskerville",
+ "goudy", "fantasy", "cursive", "ITC Stone Serif", NULL
+};
+
+static const char* gMonoNames[] = {
+ "monospace", "courier", "courier new", "monaco", NULL
+};
+
+// deliberately empty, but we use the address to identify fallback fonts
+static const char* gFBNames[] = { NULL };
+
+/* Fonts must be grouped by family, with the first font in a family having the
+ list of names (even if that list is empty), and the following members having
+ null for the list. The names list must be NULL-terminated
+*/
+static const FontInitRec gSystemFonts[] = {
+ { "samplefont.ttf", gSansNames },
+};
+
+#define DEFAULT_NAMES gSansNames
+
+// these globals are assigned (once) by load_system_fonts()
+static FamilyRec* gDefaultFamily;
+static SkTypeface* gDefaultNormal;
+
+/* This is sized conservatively, assuming that it will never be a size issue.
+ It will be initialized in load_system_fonts(), and will be filled with the
+ fontIDs that can be used for fallback consideration, in sorted order (sorted
+ meaning element[0] should be used first, then element[1], etc. When we hit
+ a fontID==0 in the array, the list is done, hence our allocation size is
+ +1 the total number of possible system fonts. Also see NextLogicalFont().
+ */
+static uint32_t gFallbackFonts[SK_ARRAY_COUNT(gSystemFonts)+1];
+
+/* Called once (ensured by the sentinel check at the beginning of our body).
+ Initializes all the globals, and register the system fonts.
+ */
+static void load_system_fonts() {
+ // check if we've already be called
+ if (NULL != gDefaultNormal) {
+ return;
+ }
+
+ const FontInitRec* rec = gSystemFonts;
+ SkTypeface* firstInFamily = NULL;
+ int fallbackCount = 0;
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gSystemFonts); i++) {
+ // if we're the first in a new family, clear firstInFamily
+ if (rec[i].fNames != NULL) {
+ firstInFamily = NULL;
+ }
+
+ SkString name;
+ SkTypeface::Style style;
+
+ // we expect all the fonts, except the "fallback" fonts
+ bool isExpected = (rec[i].fNames != gFBNames);
+ if (!get_name_and_style(rec[i].fFileName, &name, &style, isExpected)) {
+ continue;
+ }
+
+ SkTypeface* tf = SkNEW_ARGS(FileTypeface,
+ (style,
+ true, // system-font (cannot delete)
+ firstInFamily, // what family to join
+ rec[i].fFileName) // filename
+ );
+
+ if (rec[i].fNames != NULL) {
+ // see if this is one of our fallback fonts
+ if (rec[i].fNames == gFBNames) {
+ // SkDebugf("---- adding %s as fallback[%d] fontID %d\n",
+ // rec[i].fFileName, fallbackCount, tf->uniqueID());
+ gFallbackFonts[fallbackCount++] = tf->uniqueID();
+ }
+
+ firstInFamily = tf;
+ FamilyRec* family = find_family(tf);
+ const char* const* names = rec[i].fNames;
+
+ // record the default family if this is it
+ if (names == DEFAULT_NAMES) {
+ gDefaultFamily = family;
+ }
+ // add the names to map to this family
+ while (*names) {
+ add_name(*names, family);
+ names += 1;
+ }
+ }
+ }
+
+ // do this after all fonts are loaded. This is our default font, and it
+ // acts as a sentinel so we only execute load_system_fonts() once
+ gDefaultNormal = find_best_face(gDefaultFamily, SkTypeface::kNormal);
+ // now terminate our fallback list with the sentinel value
+ gFallbackFonts[fallbackCount] = 0;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
+ const char* name = ((FamilyTypeface*)face)->getUniqueString();
+
+ stream->write8((uint8_t)face->style());
+
+ if (NULL == name || 0 == *name) {
+ stream->writePackedUInt(0);
+// SkDebugf("--- fonthost serialize null\n");
+ } else {
+ uint32_t len = strlen(name);
+ stream->writePackedUInt(len);
+ stream->write(name, len);
+// SkDebugf("--- fonthost serialize <%s> %d\n", name, face->style());
+ }
+}
+
+SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
+ load_system_fonts();
+
+ int style = stream->readU8();
+
+ int len = stream->readPackedUInt();
+ if (len > 0) {
+ SkString str;
+ str.resize(len);
+ stream->read(str.writable_str(), len);
+
+ const FontInitRec* rec = gSystemFonts;
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gSystemFonts); i++) {
+ if (strcmp(rec[i].fFileName, str.c_str()) == 0) {
+ // backup until we hit the fNames
+ for (int j = i; j >= 0; --j) {
+ if (rec[j].fNames != NULL) {
+ return SkFontHost::CreateTypeface(NULL,
+ rec[j].fNames[0], (SkTypeface::Style)style);
+ }
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
+ const char familyName[],
+ SkTypeface::Style style) {
+ load_system_fonts();
+
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ // clip to legal style bits
+ style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
+
+ SkTypeface* tf = NULL;
+
+ if (NULL != familyFace) {
+ tf = find_typeface(familyFace, style);
+ } else if (NULL != familyName) {
+// SkDebugf("======= familyName <%s>\n", familyName);
+ tf = find_typeface(familyName, style);
+ }
+
+ if (NULL == tf) {
+ tf = find_best_face(gDefaultFamily, style);
+ }
+
+ // we ref(), since the symantic is to return a new instance
+ tf->ref();
+ return tf;
+}
+
+bool SkFontHost::ValidFontID(uint32_t fontID) {
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ return find_from_uniqueID(fontID) != NULL;
+}
+
+SkStream* SkFontHost::OpenStream(uint32_t fontID) {
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ FamilyTypeface* tf = (FamilyTypeface*)find_from_uniqueID(fontID);
+ SkStream* stream = tf ? tf->openStream() : NULL;
+
+ if (stream && stream->getLength() == 0) {
+ stream->unref();
+ stream = NULL;
+ }
+ return stream;
+}
+
+size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
+ int32_t* index) {
+ SkAutoMutexAcquire ac(gFamilyMutex);
+
+ FamilyTypeface* tf = (FamilyTypeface*)find_from_uniqueID(fontID);
+ const char* src = tf ? tf->getFilePath() : NULL;
+
+ if (src) {
+ size_t size = strlen(src);
+ if (path) {
+ memcpy(path, src, SkMin32(size, length));
+ }
+ if (index) {
+ *index = 0; // we don't have collections (yet)
+ }
+ return size;
+ } else {
+ return 0;
+ }
+}
+
+uint32_t SkFontHost::NextLogicalFont(uint32_t fontID) {
+ load_system_fonts();
+
+ /* First see if fontID is already one of our fallbacks. If so, return
+ its successor. If fontID is not in our list, then return the first one
+ in our list. Note: list is zero-terminated, and returning zero means
+ we have no more fonts to use for fallbacks.
+ */
+ const uint32_t* list = gFallbackFonts;
+ for (int i = 0; list[i] != 0; i++) {
+ if (list[i] == fontID) {
+ return list[i+1];
+ }
+ }
+ return list[0];
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
+ if (NULL == stream || stream->getLength() <= 0) {
+ return NULL;
+ }
+
+ SkString name;
+ SkTypeface::Style style = find_name_and_style(stream, &name);
+
+ return SkNEW_ARGS(StreamTypeface, (style, false, NULL, stream));
+}
+
+SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
+ SkStream* stream = SkNEW_ARGS(SkMMAPStream, (path));
+ SkTypeface* face = SkFontHost::CreateTypefaceFromStream(stream);
+ // since we created the stream, we let go of our ref() here
+ stream->unref();
+ return face;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+size_t SkFontHost::ShouldPurgeFontCache(size_t sizeAllocatedSoFar) {
+ if (sizeAllocatedSoFar > FONT_CACHE_MEMORY_BUDGET)
+ return sizeAllocatedSoFar - FONT_CACHE_MEMORY_BUDGET;
+ else
+ return 0; // nothing to do
+}
+