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San Rafael, CA 94903, U.S.A., +1(415)492-9861, for further information.
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/*$Id: gxdcolor.h 8022 2007-06-05 22:23:38Z giles $ */
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/*$Id: gxdcolor.h 8655 2008-04-21 14:53:38Z leonardo $ */
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/* Device color representation for Ghostscript */
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#ifndef gxdcolor_INCLUDED
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* Serialize and deserialize a device color.
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* The "write" routine converts a device color into a string for
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* The "write" routine converts a device color into a stream for
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* writing to the command list. *psize is the amount of space
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* available. If the saved color and the current color are the same,
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* the routine sets *psize to 0 and returns 1. Otherwise, if *psize
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* is large enough, the procedure sets *psize to the amount actually
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* used and returns 0. If *psize is too small and no other problem
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* used and returns 0. If *psize is zero and no other problem
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* is detected, *psize is set to the amount required and
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* gs_error_rangecheck is returned. If some other error is detected,
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* *psize is left unchanged and the error code is returned.
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* gs_error_rangecheck is returned. If *psize is not zero,
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* a data block is written into the buffer, and the function returns 0.
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* Note the function always fills entire buffer of *psize length,
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* except for the last block of the stream, which is written until
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* the stream end. If some other error is detected, *psize is left unchanged
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* and the error code is returned. When *psize is not zero,
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* the offset operand specifies the position of the block in the stream.
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* The "read" routine converts the string representation back into
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* The "read" routine converts the stream representation back into
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* the full device color structure. The value returned is the number
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* of bytes actually read, or < 0 in the event of an error.
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* The offset operand specifies the position of the block in the stream.
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* If the returned block length is smaller than *psize,
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* then there is no more data in the stream.
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* As with any instance of virtual serialization, the command list
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* code must include its own identifier of the color space type in
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* changed, so informaition from the prior device color will no
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* longer be available.
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* For the read and method, the imager state is passed as an operand,
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* For the read method, the imager state is passed as an operand,
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* which allows the routine to access the current device halftone
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* (always required). Also passed in a pointer to the existing device
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* color, as this is not part of the imager state. If the writer was
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#define dev_color_proc_write(proc)\
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int proc(const gx_device_color *pdevc, const gx_device_color_saved *psdc,\
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const gx_device * dev, byte *data, uint *psize)
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const gx_device * dev, uint offset, byte *data, uint *psize)
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dev_color_proc_write((*write));
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#define dev_color_proc_read(proc)\
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int proc(gx_device_color *pdevc, const gs_imager_state * pis,\
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const gx_device_color *prior_devc, const gx_device * dev,\
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const gx_device_color *prior_devc, const gx_device * dev, uint offset,\
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const byte *data, uint size, gs_memory_t *mem)
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dev_color_proc_read((*read));
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/* Define the default implementation of fill_masked. */
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dev_color_proc_fill_masked(gx_dc_default_fill_masked);
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extern dev_color_proc_write(gx_dc_cannot_write);
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extern dev_color_proc_read(gx_dc_cannot_read);
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extern_st(st_device_color);
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/* public_st_device_color() is defined in gsdcolor.h */
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src/gxdcolor.h
