home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1989, 1993 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gxbitmap.h */
- /* Definitions for stored bitmaps for Ghostscript */
-
- #ifndef gxbitmap_INCLUDED
- # define gxbitmap_INCLUDED
-
- /*
- * Drivers such as the X driver and the command list (band list) driver
- * benefit greatly by being able to cache bitmaps (tiles and characters)
- * and refer to them later. To support this, we define a bitmap ID type
- * which the kernel passes to the driver on each copy_ or tile_ operation.
- */
- typedef unsigned long gx_bitmap_id;
- #define gx_no_bitmap_id 0L
-
- /*
- * Structure for describing stored bitmaps.
- * Bitmaps are stored bit-big-endian (i.e., the 0x80 bit of the first
- * byte corresponds to x=0), as a sequence of bytes (i.e., you can't
- * do word-oriented operations on them if you're on a little-endian
- * platform like the Intel 80x86 or VAX). Each scan line must start on
- * a `word' (long) boundary, and hence is padded to a word boundary,
- * although this should rarely be of concern, since the raster and width
- * are specified individually. The first scan line corresponds to y=0
- * in whatever coordinate system is relevant.
- */
- /* We assume arch_align_long_mod is 1-4 or 8. */
- #if arch_align_long_mod <= 4
- # define log2_align_bitmap_mod 2
- #else
- #if arch_align_long_mod == 8
- # define log2_align_bitmap_mod 3
- #endif
- #endif
- #define align_bitmap_mod (1 << log2_align_bitmap_mod)
- #define bitmap_raster(width_bits)\
- ((uint)(((width_bits + (align_bitmap_mod * 8 - 1))\
- >> (log2_align_bitmap_mod + 3)) << log2_align_bitmap_mod))
- /*
- * The basic structure for a bitmap does not specify the depth;
- * this is implicit in the context of use.
- */
- #define gx_bitmap_common\
- byte *data;\
- int raster; /* bytes per scan line */\
- gs_int_point size; /* width, height */\
- gx_bitmap_id id
- typedef struct gx_bitmap_s {
- gx_bitmap_common;
- } gx_bitmap;
- /*
- * For bitmaps used as halftone tiles, we may replicate the tile in
- * X and/or Y, but it is still valuable to know the true tile dimensions
- * (i.e., the dimensions prior to replication). Eventually, for rotated
- * tiles, we will include strip and shift values that will allow us to
- * store such tiles in much less space.
- */
- typedef struct gx_tile_bitmap_s {
- gx_bitmap_common;
- ushort rep_width, rep_height; /* true size of tile */
- } gx_tile_bitmap;
-
- #endif /* gxbitmap_INCLUDED */
-