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