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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "SkAdvancedTypefaceMetrics.h"
     18 #include "SkTypeface.h"
     19 #include "SkFontHost.h"
     20 
     21 //#define TRACE_LIFECYCLE
     22 
     23 #ifdef TRACE_LIFECYCLE
     24     static int32_t gTypefaceCounter;
     25 #endif
     26 
     27 SkTypeface::SkTypeface(Style style, SkFontID fontID, bool isFixedWidth)
     28     : fUniqueID(fontID), fStyle(style), fIsFixedWidth(isFixedWidth) {
     29 #ifdef TRACE_LIFECYCLE
     30     SkDebugf("SkTypeface: create  %p fontID %d total %d\n",
     31              this, fontID, ++gTypefaceCounter);
     32 #endif
     33 }
     34 
     35 SkTypeface::~SkTypeface() {
     36 #ifdef TRACE_LIFECYCLE
     37     SkDebugf("SkTypeface: destroy %p fontID %d total %d\n",
     38              this, fUniqueID, --gTypefaceCounter);
     39 #endif
     40 }
     41 
     42 ///////////////////////////////////////////////////////////////////////////////
     43 
     44 uint32_t SkTypeface::UniqueID(const SkTypeface* face) {
     45     if (face) {
     46         return face->uniqueID();
     47     }
     48 
     49     // We cache the default fontID, assuming it will not change during a boot
     50     // The initial value of 0 is fine, since a typeface's uniqueID should not
     51     // be zero.
     52     static uint32_t gDefaultFontID;
     53 
     54     if (0 == gDefaultFontID) {
     55         SkTypeface* defaultFace =
     56                 SkFontHost::CreateTypeface(NULL, NULL, NULL, 0,
     57                                            SkTypeface::kNormal);
     58         SkASSERT(defaultFace);
     59         gDefaultFontID = defaultFace->uniqueID();
     60         defaultFace->unref();
     61     }
     62     return gDefaultFontID;
     63 }
     64 
     65 bool SkTypeface::Equal(const SkTypeface* facea, const SkTypeface* faceb) {
     66     return SkTypeface::UniqueID(facea) == SkTypeface::UniqueID(faceb);
     67 }
     68 
     69 ///////////////////////////////////////////////////////////////////////////////
     70 
     71 SkTypeface* SkTypeface::CreateFromName(const char name[], Style style) {
     72     return SkFontHost::CreateTypeface(NULL, name, NULL, 0, style);
     73 }
     74 
     75 SkTypeface* SkTypeface::CreateForChars(const void* data, size_t bytelength,
     76                                        Style s) {
     77     return SkFontHost::CreateTypeface(NULL, NULL, data, bytelength, s);
     78 }
     79 
     80 SkTypeface* SkTypeface::CreateFromTypeface(const SkTypeface* family, Style s) {
     81     return SkFontHost::CreateTypeface(family, NULL, NULL, 0, s);
     82 }
     83 
     84 SkTypeface* SkTypeface::CreateFromStream(SkStream* stream) {
     85     return SkFontHost::CreateTypefaceFromStream(stream);
     86 }
     87 
     88 SkTypeface* SkTypeface::CreateFromFile(const char path[]) {
     89     return SkFontHost::CreateTypefaceFromFile(path);
     90 }
     91 
     92 ///////////////////////////////////////////////////////////////////////////////
     93 
     94 void SkTypeface::serialize(SkWStream* stream) const {
     95     SkFontHost::Serialize(this, stream);
     96 }
     97 
     98 SkTypeface* SkTypeface::Deserialize(SkStream* stream) {
     99     return SkFontHost::Deserialize(stream);
    100 }
    101 
    102 SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics(
    103         SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo) const {
    104     return SkFontHost::GetAdvancedTypefaceMetrics(fUniqueID, perGlyphInfo);
    105 }
    106