![]() |
![]() |
![]() |
![]() |
NAMEcache_view - Working with Cache Views
SYNOPSISconst PixelPacket * AcquireCacheView( const ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows, ExceptionInfo *exception ); void CloseCacheView( ViewInfo *view_info ); PixelPacket * GetCacheView( ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows ); IndexPacket * GetCacheViewIndexes( const ViewInfo *view_info ); PixelPacket * GetCacheViewPixels( const ViewInfo *view_info ); ViewInfo * OpenCacheView( Image *image ); PixelPacket * SetCacheView( ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows ); MagickBooleanType SyncCacheView( ViewInfo *view_info );
FUNCTION DESCRIPTIONS
AcquireCacheViewAcquireCacheView() gets pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned. The format of the AcquireCacheView method is: const PixelPacket *AcquireCacheView ( const ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows, ExceptionInfo *exception ); A description of each parameter follows:
CloseCacheViewCloseCacheView() closes the specified view returned by a previous call to OpenCacheView ( ) . The format of the CloseCacheView method is: void CloseCacheView ( ViewInfo *view_info ); A description of each parameter follows:
GetCacheViewGetCacheView() gets pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned. The format of the GetCacheView method is: PixelPacket *GetCacheView ( ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows ); A description of each parameter follows:
GetCacheViewIndexesGetCacheViewIndexes() returns the indexes associated with the specified view. The format of the GetCacheViewIndexes method is: IndexPacket *GetCacheViewIndexes ( const ViewInfo *view_info ); A description of each parameter follows:
GetCacheViewPixelsGetCacheViewPixels() returns the pixels associated with the specified view. The format of the GetCacheViewPixels method is: PixelPacket *GetCacheViewPixels ( const ViewInfo *view_info ); A description of each parameter follows:
OpenCacheViewOpenCacheView() opens a view into the pixel cache. The format of the OpenCacheView method is: ViewInfo *OpenCacheView ( Image *image ); A description of each parameter follows:
SetCacheViewSetCacheView() gets pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned. The format of the SetCacheView method is: PixelPacket *SetCacheView ( ViewInfo *view_info, const long x, const long y, const unsigned long columns, const unsigned long rows ); A description of each parameter follows:
SyncCacheViewSyncCacheView() saves the view_info pixels to the in-memory or disk cache. The method returns MagickTrue if the pixel region is synced, otherwise MagickFalse. The format of the SyncCacheView method is: MagickBooleanType SyncCacheView ( ViewInfo *view_info ); A description of each parameter follows:
![]() |