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- /* Copyright (C) 1989, 1991, 1992, 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.
- */
-
- /* gxdevmem.h */
- /* "Memory" device structure for Ghostscript library */
- /* Requires gxdevice.h */
-
- /*
- * A 'memory' device is essentially a stored bitmap.
- * There are several different kinds: 1-bit black and white,
- * 2-, 4-, and 8-bit mapped color, and 16-, 24-, and 32-bit RGB color.
- * (16-bit uses 5/6/5 bits per color. 32-bit uses a padding byte;
- * 24-bit takes less space, but is slower.) All use the same structure,
- * since it's so awkward to get the effect of subclasses in C.
- * We should support 32-bit CMYK color, but we don't yet.
- *
- * Regardless of the machine byte order, we store bytes big-endian.
- * This is required if the bits will be used as the source for a
- * rendering operation, and doesn't cost much to maintain. Since
- * memory devices also are guaranteed to allocate the bitmap consecutively,
- * the bitmap can serve directly as input to copy_mono or copy_color
- * operations.
- */
- typedef struct gx_device_memory_s gx_device_memory;
- struct gx_device_memory_s {
- gx_device_forward_common; /* (see gxdevice.h) */
- gs_matrix initial_matrix; /* the initial transformation */
- uint raster; /* bytes per scan line, */
- /* filled in by 'open' */
- bool foreign_bits; /* if true, bits are not in */
- /* GC-able space */
- byte *base;
- byte **line_ptrs; /* scan line pointers */
- #define scan_line_base(dev,y) (dev->line_ptrs[y])
- /* If the bitmap_memory pointer is non-zero, it is used for */
- /* allocating the bitmap when the device is opened, */
- /* and freeing it when the device is closed. */
- gs_memory_t *bitmap_memory;
- /* Following is only needed for monochrome. */
- int invert; /* 0 if 1=white, -1 if 1=black */
- /* Following is only needed for mapped color. */
- gs_string palette; /* RGB triples */
- /* Following is only used for 24-bit color. */
- struct _c24 {
- gx_color_index rgb; /* cache key */
- bits32 rgbr, gbrg, brgb; /* cache value */
- } color24;
- };
- extern_st(st_device_memory);
- #define public_st_device_memory() /* in gdevmem1.c */\
- gs_public_st_composite(st_device_memory, gx_device_memory,\
- "gx_device_memory", device_memory_enum_ptrs, device_memory_reloc_ptrs)
- #define st_device_memory_max_ptrs (st_device_forward_max_ptrs + 2)
-
- /*
- * Memory devices may have special setup requirements.
- * In particular, it may not be obvious how much space to allocate
- * for the bitmap. Here is the routine that computes this
- * from the width and height in the device structure.
- */
- ulong gdev_mem_bitmap_size(P1(const gx_device_memory *));
- /*
- * Compute the raster (bytes per line) similarly.
- */
- #define gdev_mem_raster(mdev)\
- gx_device_raster((const gx_device *)(mdev), 1)
-
- /* Determine the appropriate memory device for a given */
- /* number of bits per pixel (0 if none suitable). */
- const gx_device_memory *gdev_mem_device_for_bits(P1(int));
-
- /* Make a memory device. */
- /* The gs_memory_t argument is 0 if the device is temporary and local, */
- /* or the allocator that was used to allocate it if it is a real object. */
- /* The int argument is 1 if the device should be a page device, */
- /* 0 if it should propagate this property from its target, or */
- /* -1 if it should not be a page device. */
- void gs_make_mem_mono_device(P2(gx_device_memory *, gs_memory_t *));
- void gs_make_mem_device(P4(gx_device_memory *, const gx_device_memory *, gs_memory_t *, int));
-
- /* Test whether a device is a memory device. */
- bool gs_device_is_memory(P1(const gx_device *));
-