michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkCGUtils.h"
michael@0: #include "SkStream.h"
michael@0: 
michael@0: // This is used by CGDataProviderCreateWithData
michael@0: 
michael@0: static void unref_proc(void* info, const void* addr, size_t size) {
michael@0:     SkASSERT(info);
michael@0:     ((SkRefCnt*)info)->unref();
michael@0: }
michael@0: 
michael@0: // These are used by CGDataProviderSequentialCallbacks
michael@0: 
michael@0: static size_t get_bytes_proc(void* info, void* buffer, size_t bytes) {
michael@0:     SkASSERT(info);
michael@0:     return ((SkStream*)info)->read(buffer, bytes);
michael@0: }
michael@0: 
michael@0: static off_t skip_forward_proc(void* info, off_t bytes) {
michael@0:     return ((SkStream*)info)->skip((size_t) bytes);
michael@0: }
michael@0: 
michael@0: static void rewind_proc(void* info) {
michael@0:     SkASSERT(info);
michael@0:     ((SkStream*)info)->rewind();
michael@0: }
michael@0: 
michael@0: static void release_info_proc(void* info) {
michael@0:     SkASSERT(info);
michael@0:     ((SkStream*)info)->unref();
michael@0: }
michael@0: 
michael@0: CGDataProviderRef SkCreateDataProviderFromStream(SkStream* stream) {
michael@0:     stream->ref();  // unref will be called when the provider is deleted
michael@0: 
michael@0:     const void* addr = stream->getMemoryBase();
michael@0:     if (addr) {
michael@0:         // special-case when the stream is just a block of ram
michael@0:         return CGDataProviderCreateWithData(stream, addr, stream->getLength(),
michael@0:                                             unref_proc);
michael@0:     }
michael@0: 
michael@0:     CGDataProviderSequentialCallbacks rec;
michael@0:     sk_bzero(&rec, sizeof(rec));
michael@0:     rec.version = 0;
michael@0:     rec.getBytes = get_bytes_proc;
michael@0:     rec.skipForward = skip_forward_proc;
michael@0:     rec.rewind = rewind_proc;
michael@0:     rec.releaseInfo = release_info_proc;
michael@0:     return CGDataProviderCreateSequential(stream, &rec);
michael@0: }
michael@0: 
michael@0: ///////////////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: #include "SkData.h"
michael@0: 
michael@0: CGDataProviderRef SkCreateDataProviderFromData(SkData* data) {
michael@0:     data->ref();
michael@0:     return CGDataProviderCreateWithData(data, data->data(), data->size(),
michael@0:                                             unref_proc);
michael@0: }