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 "SkCGUtils.h" 9 #include "SkStream.h" 10 11 // These are used by CGDataProviderCreateWithData 12 13 static void unref_proc(void* info, const void* addr, size_t size) { 14 SkASSERT(info); 15 ((SkRefCnt*)info)->unref(); 16 } 17 18 static void delete_stream_proc(void* info, const void* addr, size_t size) { 19 SkASSERT(info); 20 SkStream* stream = (SkStream*)info; 21 SkASSERT(stream->getMemoryBase() == addr); 22 SkASSERT(stream->getLength() == size); 23 SkDELETE(stream); 24 } 25 26 // These are used by CGDataProviderSequentialCallbacks 27 28 static size_t get_bytes_proc(void* info, void* buffer, size_t bytes) { 29 SkASSERT(info); 30 return ((SkStream*)info)->read(buffer, bytes); 31 } 32 33 static off_t skip_forward_proc(void* info, off_t bytes) { 34 return ((SkStream*)info)->skip((size_t) bytes); 35 } 36 37 static void rewind_proc(void* info) { 38 SkASSERT(info); 39 ((SkStream*)info)->rewind(); 40 } 41 42 // Used when info is an SkStream. 43 static void release_info_proc(void* info) { 44 SkASSERT(info); 45 SkDELETE((SkStream*)info); 46 } 47 48 CGDataProviderRef SkCreateDataProviderFromStream(SkStream* stream) { 49 // TODO: Replace with SkStream::getData() when that is added. Then we only 50 // have one version of CGDataProviderCreateWithData (i.e. same release proc) 51 const void* addr = stream->getMemoryBase(); 52 if (addr) { 53 // special-case when the stream is just a block of ram 54 return CGDataProviderCreateWithData(stream, addr, stream->getLength(), 55 delete_stream_proc); 56 } 57 58 CGDataProviderSequentialCallbacks rec; 59 sk_bzero(&rec, sizeof(rec)); 60 rec.version = 0; 61 rec.getBytes = get_bytes_proc; 62 rec.skipForward = skip_forward_proc; 63 rec.rewind = rewind_proc; 64 rec.releaseInfo = release_info_proc; 65 return CGDataProviderCreateSequential(stream, &rec); 66 } 67 68 /////////////////////////////////////////////////////////////////////////////// 69 70 #include "SkData.h" 71 72 CGDataProviderRef SkCreateDataProviderFromData(SkData* data) { 73 data->ref(); 74 return CGDataProviderCreateWithData(data, data->data(), data->size(), 75 unref_proc); 76 } 77
