Home | History | Annotate | Download | only in mac 
      1 /*
      2  * Copyright 2012 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkTypes.h"
      9 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
     10 
     11 #include "SkCGUtils.h"
     12 #include "SkStream.h"
     13 
     14 // These are used by CGDataProviderCreateWithData
     15 
     16 static void unref_proc(void* info, const void* addr, size_t size) {
     17     SkASSERT(info);
     18     ((SkRefCnt*)info)->unref();
     19 }
     20 
     21 static void delete_stream_proc(void* info, const void* addr, size_t size) {
     22     SkASSERT(info);
     23     SkStream* stream = (SkStream*)info;
     24     SkASSERT(stream->getMemoryBase() == addr);
     25     SkASSERT(stream->getLength() == size);
     26     delete stream;
     27 }
     28 
     29 // These are used by CGDataProviderSequentialCallbacks
     30 
     31 static size_t get_bytes_proc(void* info, void* buffer, size_t bytes) {
     32     SkASSERT(info);
     33     return ((SkStream*)info)->read(buffer, bytes);
     34 }
     35 
     36 static off_t skip_forward_proc(void* info, off_t bytes) {
     37     return ((SkStream*)info)->skip((size_t) bytes);
     38 }
     39 
     40 static void rewind_proc(void* info) {
     41     SkASSERT(info);
     42     ((SkStream*)info)->rewind();
     43 }
     44 
     45 // Used when info is an SkStream.
     46 static void release_info_proc(void* info) {
     47     SkASSERT(info);
     48     delete (SkStream*)info;
     49 }
     50 
     51 CGDataProviderRef SkCreateDataProviderFromStream(SkStream* stream) {
     52     // TODO: Replace with SkStream::getData() when that is added. Then we only
     53     // have one version of CGDataProviderCreateWithData (i.e. same release proc)
     54     const void* addr = stream->getMemoryBase();
     55     if (addr) {
     56         // special-case when the stream is just a block of ram
     57         return CGDataProviderCreateWithData(stream, addr, stream->getLength(),
     58                                             delete_stream_proc);
     59     }
     60 
     61     CGDataProviderSequentialCallbacks rec;
     62     sk_bzero(&rec, sizeof(rec));
     63     rec.version = 0;
     64     rec.getBytes = get_bytes_proc;
     65     rec.skipForward = skip_forward_proc;
     66     rec.rewind = rewind_proc;
     67     rec.releaseInfo = release_info_proc;
     68     return CGDataProviderCreateSequential(stream, &rec);
     69 }
     70 
     71 ///////////////////////////////////////////////////////////////////////////////
     72 
     73 #include "SkData.h"
     74 
     75 CGDataProviderRef SkCreateDataProviderFromData(SkData* data) {
     76     data->ref();
     77     return CGDataProviderCreateWithData(data, data->data(), data->size(),
     78                                             unref_proc);
     79 }
     80 
     81 #endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
     82