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
16static void unref_proc(void* info, const void* addr, size_t size) {
17    SkASSERT(info);
18    ((SkRefCnt*)info)->unref();
19}
20
21static 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
31static size_t get_bytes_proc(void* info, void* buffer, size_t bytes) {
32    SkASSERT(info);
33    return ((SkStream*)info)->read(buffer, bytes);
34}
35
36static off_t skip_forward_proc(void* info, off_t bytes) {
37    return ((SkStream*)info)->skip((size_t) bytes);
38}
39
40static void rewind_proc(void* info) {
41    SkASSERT(info);
42    ((SkStream*)info)->rewind();
43}
44
45// Used when info is an SkStream.
46static void release_info_proc(void* info) {
47    SkASSERT(info);
48    delete (SkStream*)info;
49}
50
51CGDataProviderRef 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
75CGDataProviderRef 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