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

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*/

/*$Id: gdevm8.c,v 1.2 2000/09/19 19:00:13 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(P9(chunk *, const byte *, int, int, uint,
			       int, int, byte, byte));
private void mapped8_copyN1(P8(chunk *, const byte *, int, int, uint,
			       int, int, byte));
private void mapped8_copy0N(P8(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 */