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/*
File: CGDataProvider.h
Contains: CoreGraphics data provider
Version: QuickTime 7.3
Copyright: (c) 2007 (c) 2000-2001 by Apple Computer, Inc., all rights reserved.
Bugs?: For bug reports, consult the following page on
the World Wide Web:
http://developer.apple.com/bugreporter/
*/
#ifndef CGDATAPROVIDER_H_
#define CGDATAPROVIDER_H_
#ifndef __CGBASE__
#include <CGBase.h>
#endif
#ifndef __CFURL__
#include <CFURL.h>
#endif
#if PRAGMA_ONCE
#pragma once
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if PRAGMA_IMPORT
#pragma import on
#endif
#if PRAGMA_STRUCT_ALIGN
#pragma options align=mac68k
#elif PRAGMA_STRUCT_PACKPUSH
#pragma pack(push, 2)
#elif PRAGMA_STRUCT_PACK
#pragma pack(2)
#endif
typedef struct CGDataProvider* CGDataProviderRef;
typedef CALLBACK_API_C( size_t , CGGetBytesProcPtr )(void *info, void *buffer, size_t count);
typedef CALLBACK_API_C( void , CGSkipBytesProcPtr )(void *info, size_t count);
typedef CALLBACK_API_C( void , CGRewindProcPtr )(void * info);
typedef CALLBACK_API_C( void , CGReleaseProviderProcPtr )(void * info);
/* Callbacks for sequentially accessing data.
* `getBytes' is called to copy `count' bytes from the provider's data to
* `buffer'. It should return the number of bytes copied, or 0 if there's
* no more data.
* `skipBytes' is called to skip ahead in the provider's data by `count' bytes.
* `rewind' is called to rewind the provider to the beginning of the data.
* `releaseProvider', if non-NULL, is called when the provider is freed. */
struct CGDataProviderCallbacks {
CGGetBytesProcPtr getBytes;
CGSkipBytesProcPtr skipBytes;
CGRewindProcPtr rewind;
CGReleaseProviderProcPtr releaseProvider;
};
typedef struct CGDataProviderCallbacks CGDataProviderCallbacks;
typedef CALLBACK_API_C( void *, CGGetBytePointerProcPtr )(void * info);
typedef CALLBACK_API_C( void , CGReleaseByteProcPtr )(void *info, const void *pointer);
typedef CALLBACK_API_C( size_t , CGGetBytesDirectProcPtr )(void *info, void *buffer, size_t offset, size_t count);
/* Callbacks for directly accessing data.
* `getBytePointer', if non-NULL, is called to return a pointer to the
* provider's entire block of data.
* `releaseBytePointer', if non-NULL, is called to release a pointer to
* the provider's entire block of data.
* `getBytes', if non-NULL, is called to copy `count' bytes at offset
* `offset' from the provider's data to `buffer'. It should return the
* number of bytes copied, or 0 if there's no more data.
* `releaseProvider', if non-NULL, is called when the provider is freed.
* At least one of `getBytePointer' or `getBytes' must be non-NULL. */
struct CGDataProviderDirectAccessCallbacks {
CGGetBytePointerProcPtr getBytePointer;
CGReleaseByteProcPtr releaseBytePointer;
CGGetBytesDirectProcPtr getBytes;
CGReleaseProviderProcPtr releaseProvider;
};
typedef struct CGDataProviderDirectAccessCallbacks CGDataProviderDirectAccessCallbacks;
typedef CALLBACK_API_C( void , CGReleaseDataProcPtr )(void *info, const void *data, size_t size);
/* Create a sequential-access data provider using `callbacks' to provide
* the data. `info' is passed to each of the callback functions. */
/*
* CGDataProviderCreate()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( CGDataProviderRef )
CGDataProviderCreate(
void * info,
const CGDataProviderCallbacks * callbacks);
/* Create a direct-access data provider using `callbacks' to supply `size'
* bytes of data. `info' is passed to each of the callback functions. */
/*
* CGDataProviderCreateDirectAccess()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( CGDataProviderRef )
CGDataProviderCreateDirectAccess(
void * info,
size_t size,
const CGDataProviderDirectAccessCallbacks * callbacks);
/* Create a direct-access data provider using `data', an array of `size'
* bytes. `releaseData' is called when the data provider is freed, and is
* passed `info' as its first argument. */
/*
* CGDataProviderCreateWithData()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( CGDataProviderRef )
CGDataProviderCreateWithData(
void * info,
const void * data,
size_t size,
CGReleaseDataProcPtr releaseData);
/* Create a data provider using `url'. */
/*
* CGDataProviderCreateWithURL()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( CGDataProviderRef )
CGDataProviderCreateWithURL(CFURLRef url);
/* Increment the retain count of `provider' and return it. All data
* providers are created with an initial retain count of 1. */
/*
* CGDataProviderRetain()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( CGDataProviderRef )
CGDataProviderRetain(CGDataProviderRef provider);
/* Decrement the retain count of `provider'. If the retain count reaches
* 0, then free `provider' and any associated resources. */
/*
* CGDataProviderRelease()
*
* Availability:
* Non-Carbon CFM: not available
* CarbonLib: not available
* Mac OS X: in version 10.0 and later
*/
EXTERN_API_C( void )
CGDataProviderRelease(CGDataProviderRef provider);
#if PRAGMA_STRUCT_ALIGN
#pragma options align=reset
#elif PRAGMA_STRUCT_PACKPUSH
#pragma pack(pop)
#elif PRAGMA_STRUCT_PACK
#pragma pack()
#endif
#ifdef PRAGMA_IMPORT_OFF
#pragma import off
#elif PRAGMA_IMPORT
#pragma import reset
#endif
#ifdef __cplusplus
}
#endif
#endif /* CGDATAPROVIDER_H_ */
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