add charsToGlyphs to SkTypeface

src/ports/SkFontHost_mac.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <vector>
 #ifdef SK_BUILD_FOR_MAC
@@ skipping 24 matching lines @@
 #include "SkOTUtils.h"
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkString.h"
 #include "SkStream.h"
 #include "SkThread.h"
 #include "SkTypeface_mac.h"
 #include "SkUtils.h"
 #include "SkTypefaceCache.h"
 #include "SkFontMgr.h"
+#include "SkUtils.h"
 
 //#define HACK_COLORGLYPHS
 
 class SkScalerContext_Mac;
 
 // CTFontManagerCopyAvailableFontFamilyNames() is not always available, so we
 // provide a wrapper here that will return an empty array if need be.
 static CFArrayRef SkCTFontManagerCopyAvailableFontFamilyNames() {
 #ifdef SK_BUILD_FOR_IOS
     return CFArrayCreate(NULL, NULL, 0, NULL);
@@ skipping 399 matching lines @@
     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE;
     virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE;
     virtual size_t onGetTableData(SkFontTableTag, size_t offset,
                                   size_t length, void* data) const SK_OVERRIDE;
     virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE;
     virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE;
     virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE;
     virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
                                 SkAdvancedTypefaceMetrics::PerGlyphInfo,
                                 const uint32_t*, uint32_t) const SK_OVERRIDE;
+    virtual int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[],
+                                int glyphCount) const SK_OVERRIDE;
+    virtual int onCountGlyphs() const SK_OVERRIDE;
 
 private:
 
     typedef SkTypeface INHERITED;
 };
 
 static SkTypeface* NewFromFontRef(CTFontRef fontRef, const char name[]) {
     SkASSERT(fontRef);
     bool isFixedPitch;
     SkTypeface::Style style = computeStyleBits(fontRef, &isFixedPitch);
@@ skipping 1419 matching lines @@
                                          bool* isLocalStream) const {
     SkString tmpStr;
 
     desc->setFamilyName(get_str(CTFontCopyFamilyName(fFontRef), &tmpStr));
     desc->setFullName(get_str(CTFontCopyFullName(fFontRef), &tmpStr));
     desc->setPostscriptName(get_str(CTFontCopyPostScriptName(fFontRef), &tmpStr));
     // TODO: need to add support for local-streams (here and openStream)
     *isLocalStream = false;
 }
 
+int SkTypeface_Mac::onCharsToGlyphs(const void* chars, Encoding encoding,
+                                    uint16_t glyphs[], int glyphCount) const {
+    // UniChar is utf16
+    SkAutoSTMalloc<1024, UniChar> charStorage;
+    const UniChar* src;
+    switch (encoding) {
+        case kUTF8_Encoding: {
+            const char* u8 = (const char*)chars;
+            const UniChar* u16 = src = charStorage.reset(2 * glyphCount);
+            for (int i = 0; i < glyphCount; ++i) {
+                SkUnichar uni = SkUTF8_NextUnichar(&u8);
+                int n = SkUTF16_FromUnichar(uni, (uint16_t*)u16);
+                u16 += n;
+            }
+            break;
+        }
+        case kUTF16_Encoding:
+            src = (const UniChar*)chars;
+            break;
+        case kUTF32_Encoding: {
+            const SkUnichar* u32 = (const SkUnichar*)chars;
+            const UniChar* u16 = src = charStorage.reset(2 * glyphCount);
+            for (int i = 0; i < glyphCount; ++i) {
+                int n = SkUTF16_FromUnichar(u32[i], (uint16_t*)u16);
+                u16 += n;
+            }
+            break;
+        }
+    }
+
+    // Our caller may not want glyphs for output, but we need to give that
+    // storage to CT, so we can walk it looking for the first non-zero.
+    SkAutoSTMalloc<1024, uint16_t> glyphStorage;
+    uint16_t* macGlyphs = glyphs;
+    if (NULL == macGlyphs) {
+        macGlyphs = glyphStorage.reset(glyphCount);
+    }
+
+    if (CTFontGetGlyphsForCharacters(fFontRef, src, macGlyphs, glyphCount)) {
+        return glyphCount;
+    }
+    // If we got false, then we need to manually look for first failure
+    for (int i = 0; i < glyphCount; ++i) {
+        if (0 == macGlyphs[i]) {
+            return i;
+        }
+    }
+    // odd to get here, as we expected CT to have returned true up front.
+    return glyphCount;
+}
+
+int SkTypeface_Mac::onCountGlyphs() const {
+    return CTFontGetGlyphCount(fFontRef);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 #if 1
 
 static bool find_desc_str(CTFontDescriptorRef desc, CFStringRef name, SkString* value) {
     AutoCFRelease<CFStringRef> ref((CFStringRef)CTFontDescriptorCopyAttribute(desc, name));
     if (NULL == ref.get()) {
         return false;
     }
     CFStringToSkString(ref, value);
@@ skipping 285 matching lines @@
             return NULL;
         }
         return create_from_dataProvider(pr);
     }
 };
 
 SkFontMgr* SkFontMgr::Factory() {
     return SkNEW(SkFontMgr_Mac);
 }
 #endif