harvey/sys/src/cmd/gs/src/gdevm8.c

/* Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Aladdin Enterprises.  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 the license contained in the file LICENSE in this distribution.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: gdevm8.c,v 1.5 2002/06/16 05:48:55 lpd Exp $ */
/* 8-bit-per-pixel "memory" (stored bitmap) device */
#include "memory_.h"
#include "gx.h"
#include "gxdevice.h"
#include "gxdevmem.h"		/* semi-public definitions */
#include "gdevmem.h"		/* private definitions */

#define mem_gray8_strip_copy_rop mem_gray8_rgb24_strip_copy_rop

/* ================ Standard (byte-oriented) device ================ */

#undef chunk
#define chunk byte

/* Procedures */
declare_mem_procs(mem_mapped8_copy_mono, mem_mapped8_copy_color, mem_mapped8_fill_rectangle);

/* The device descriptor. */
const gx_device_memory mem_mapped8_device =
mem_device("image8", 8, 0,
	   mem_mapped_map_rgb_color, mem_mapped_map_color_rgb,
  mem_mapped8_copy_mono, mem_mapped8_copy_color, mem_mapped8_fill_rectangle,
	   mem_gray8_strip_copy_rop);

/* Convert x coordinate to byte offset in scan line. */
#undef x_to_byte
#define x_to_byte(x) (x)

/* Fill a rectangle with a color. */
private int
mem_mapped8_fill_rectangle(gx_device * dev,
			   int x, int y, int w, int h, gx_color_index color)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;

    fit_fill(dev, x, y, w, h);
    bytes_fill_rectangle(scan_line_base(mdev, y) + x, mdev->raster,
			 (byte) color, w, h);
    return 0;
}

/* Copy a monochrome bitmap. */
/* We split up this procedure because of limitations in the bcc32 compiler. */
private void mapped8_copy01(chunk *, const byte *, int, int, uint,
			    int, int, byte, byte);
private void mapped8_copyN1(chunk *, const byte *, int, int, uint,
			    int, int, byte);
private void mapped8_copy0N(chunk *, const byte *, int, int, uint,
			    int, int, byte);
private int
mem_mapped8_copy_mono(gx_device * dev,
	       const byte * base, int sourcex, int sraster, gx_bitmap_id id,
	int x, int y, int w, int h, gx_color_index zero, gx_color_index one)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;
    const byte *line;
    int first_bit;

    declare_scan_ptr(dest);
    fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
    setup_rect(dest);
    line = base + (sourcex >> 3);
    first_bit = 0x80 >> (sourcex & 7);
#define is_color(c) ((int)(c) != (int)gx_no_color_index)
    if (is_color(one)) {
	if (is_color(zero))
	    mapped8_copy01(dest, line, first_bit, sraster, draster,
			   w, h, (byte) zero, (byte) one);
	else
	    mapped8_copyN1(dest, line, first_bit, sraster, draster,
			   w, h, (byte) one);
    } else if (is_color(zero))
	mapped8_copy0N(dest, line, first_bit, sraster, draster,
		       w, h, (byte) zero);
#undef is_color
    return 0;
}
/* Macros for copy loops */
#define COPY_BEGIN\
	while ( h-- > 0 )\
	{	register byte *pptr = dest;\
		const byte *sptr = line;\
		register int sbyte = *sptr;\
		register uint bit = first_bit;\
		int count = w;\
		do\
		{
#define COPY_END\
			if ( (bit >>= 1) == 0 )\
				bit = 0x80, sbyte = *++sptr;\
			pptr++;\
		}\
		while ( --count > 0 );\
		line += sraster;\
		inc_ptr(dest, draster);\
	}
/* Halftone coloring */
private void
mapped8_copy01(chunk * dest, const byte * line, int first_bit,
	       int sraster, uint draster, int w, int h, byte b0, byte b1)
{
    COPY_BEGIN
	* pptr = (sbyte & bit ? b1 : b0);
    COPY_END
}
/* Stenciling */
private void
mapped8_copyN1(chunk * dest, const byte * line, int first_bit,
	       int sraster, uint draster, int w, int h, byte b1)
{
    COPY_BEGIN
	if (sbyte & bit)
	*pptr = b1;
    COPY_END
}
/* Reverse stenciling */
private void
mapped8_copy0N(chunk * dest, const byte * line, int first_bit,
	       int sraster, uint draster, int w, int h, byte b0)
{
    COPY_BEGIN
	if (!(sbyte & bit))
	*pptr = b0;
    COPY_END
}
#undef COPY_BEGIN
#undef COPY_END

/* Copy a color bitmap. */
private int
mem_mapped8_copy_color(gx_device * dev,
	       const byte * base, int sourcex, int sraster, gx_bitmap_id id,
		       int x, int y, int w, int h)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;

    fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
    mem_copy_byte_rect(mdev, base, sourcex, sraster, x, y, w, h);
    return 0;
}

/* ================ "Word"-oriented device ================ */

/* Note that on a big-endian machine, this is the same as the */
/* standard byte-oriented-device. */

#if !arch_is_big_endian

/* Procedures */
declare_mem_procs(mem8_word_copy_mono, mem8_word_copy_color, mem8_word_fill_rectangle);

/* Here is the device descriptor. */
const gx_device_memory mem_mapped8_word_device =
mem_full_device("image8w", 8, 0, mem_open,
		mem_mapped_map_rgb_color, mem_mapped_map_color_rgb,
	mem8_word_copy_mono, mem8_word_copy_color, mem8_word_fill_rectangle,
		gx_default_map_cmyk_color, gx_default_strip_tile_rectangle,
		gx_no_strip_copy_rop, mem_word_get_bits_rectangle);

/* Fill a rectangle with a color. */
private int
mem8_word_fill_rectangle(gx_device * dev, int x, int y, int w, int h,
			 gx_color_index color)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;
    byte *base;
    uint raster;

    fit_fill(dev, x, y, w, h);
    base = scan_line_base(mdev, y);
    raster = mdev->raster;
    mem_swap_byte_rect(base, raster, x << 3, w << 3, h, true);
    bytes_fill_rectangle(base + x, raster, (byte) color, w, h);
    mem_swap_byte_rect(base, raster, x << 3, w << 3, h, true);
    return 0;
}

/* Copy a bitmap. */
private int
mem8_word_copy_mono(gx_device * dev,
	       const byte * base, int sourcex, int sraster, gx_bitmap_id id,
	int x, int y, int w, int h, gx_color_index zero, gx_color_index one)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;
    byte *row;
    uint raster;
    bool store;

    fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
    row = scan_line_base(mdev, y);
    raster = mdev->raster;
    store = (zero != gx_no_color_index && one != gx_no_color_index);
    mem_swap_byte_rect(row, raster, x << 3, w << 3, h, store);
    mem_mapped8_copy_mono(dev, base, sourcex, sraster, id,
			  x, y, w, h, zero, one);
    mem_swap_byte_rect(row, raster, x << 3, w << 3, h, false);
    return 0;
}

/* Copy a color bitmap. */
private int
mem8_word_copy_color(gx_device * dev,
	       const byte * base, int sourcex, int sraster, gx_bitmap_id id,
		     int x, int y, int w, int h)
{
    gx_device_memory * const mdev = (gx_device_memory *)dev;
    byte *row;
    uint raster;

    fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
    row = scan_line_base(mdev, y);
    raster = mdev->raster;
    mem_swap_byte_rect(row, raster, x << 3, w << 3, h, true);
    mem_copy_byte_rect(mdev, base, sourcex, sraster, x, y, w, h);
    mem_swap_byte_rect(row, raster, x << 3, w << 3, h, false);
    return 0;
}

#endif /* !arch_is_big_endian */