diff options
Diffstat (limited to 'gs/base/gxband.h')
| -rw-r--r-- | gs/base/gxband.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/gs/base/gxband.h b/gs/base/gxband.h new file mode 100644 index 000000000..bd757d830 --- /dev/null +++ b/gs/base/gxband.h @@ -0,0 +1,89 @@ +/* Copyright (C) 2001-2006 Artifex Software, Inc. + All Rights Reserved. + + This software is provided AS-IS with no warranty, either express or + implied. + + This software is distributed under license and may not be copied, modified + or distributed except as expressly authorized under the terms of that + license. Refer to licensing information at http://www.artifex.com/ + or contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, + San Rafael, CA 94903, U.S.A., +1(415)492-9861, for further information. +*/ + +/* $Id$ */ +/* Band-processing parameters for Ghostscript */ + +#ifndef gxband_INCLUDED +# define gxband_INCLUDED + +#include "gxclio.h" + +/* + * Define the parameters controlling banding. + */ +typedef struct gx_band_params_s { + bool page_uses_transparency; /* PDF 1.4 transparency is used on the page */ + int BandWidth; /* (optional) band width in pixels */ + int BandHeight; /* (optional) */ + long BandBufferSpace; /* (optional) */ +} gx_band_params_t; + +#define BAND_PARAMS_INITIAL_VALUES 0, 0, 0 + +/* + * Define information about the colors used on a page. + */ +typedef struct gx_colors_used_s { + gx_color_index or; /* the "or" of all the used colors */ + bool slow_rop; /* true if any RasterOps that can't be */ + /* executed plane-by-plane on CMYK devices */ +} gx_colors_used_t; + +/* + * We want to store color usage information for each band in the page_info + * structure, but we also want this structure to be of a fixed (and + * reasonable) size. We do this by allocating a fixed number of colors_used + * structures in the page_info structure, and if there are more bands than + * we have allocated, we simply reduce the precision of the information by + * letting each colors_used structure cover multiple bands. + * + * 30 entries would be large enough to cover A4 paper (11.3") at 600 dpi + * with 256-scan-line bands. We pick 50 somewhat arbitrarily. + */ +#define PAGE_INFO_NUM_COLORS_USED 50 + +/* + * Define the information for a saved page. + */ +typedef struct gx_band_page_info_s { + char cfname[gp_file_name_sizeof]; /* command file name */ + clist_file_ptr cfile; /* command file, normally 0 */ + char bfname[gp_file_name_sizeof]; /* block file name */ + clist_file_ptr bfile; /* block file, normally 0 */ + const clist_io_procs_t *io_procs; + uint tile_cache_size; /* size of tile cache */ + int64_t bfile_end_pos; /* ftell at end of bfile */ + gx_band_params_t band_params; /* parameters used when writing band list */ + /* (actual values, no 0s) */ + int scan_lines_per_colors_used; /* number of scan lines per colors_used */ + /* entry (a multiple of the band height) */ + gx_colors_used_t band_colors_used[PAGE_INFO_NUM_COLORS_USED]; /* colors used on the page */ +} gx_band_page_info_t; +#define PAGE_INFO_NULL_VALUES\ + { 0 }, 0, { 0 }, NULL, 0, 0, 0, { BAND_PARAMS_INITIAL_VALUES },\ + 0x3fffffff, { { 0 } } + +/* + * By convention, the structure member containing the above is called + * page_info. Define shorthand accessors for its members. + */ +#define page_cfile page_info.cfile +#define page_cfname page_info.cfname +#define page_bfile page_info.bfile +#define page_bfname page_info.bfname +#define page_tile_cache_size page_info.tile_cache_size +#define page_bfile_end_pos page_info.bfile_end_pos +#define page_band_height page_info.band_params.BandHeight + +#endif /* ndef gxband_INCLUDED */ |