/* Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: gdevm32.c,v $ $Revision: 1.2.2.1 $ */
/* 32-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 */

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

#undef chunk
#define chunk byte

/* Procedures */
declare_mem_procs(mem_true32_copy_mono, mem_true32_copy_color, mem_true32_fill_rectangle);

/* The device descriptor. */
const gx_device_memory mem_true32_device =
mem_full_device("image32", 24, 8, mem_open,
		gx_default_map_rgb_color, gx_default_map_color_rgb,
     mem_true32_copy_mono, mem_true32_copy_color, mem_true32_fill_rectangle,
	    gx_default_cmyk_map_cmyk_color, gx_default_strip_tile_rectangle,
		mem_default_strip_copy_rop, mem_get_bits_rectangle);

/* Convert x coordinate to byte offset in scan line. */
#undef x_to_byte
#define x_to_byte(x) ((x) << 2)

/* Swap the bytes of a color if needed. */
#define color_swap_bytes(color)\
  (((color) >> 24) + (((color) >> 8) & 0xff00) +\
   (((color) & 0xff00) << 8) + ((color) << 24))
#if arch_is_big_endian
#  define arrange_bytes(color) (color)
#else
#  define arrange_bytes(color) color_swap_bytes(color)
#endif

/* Fill a rectangle with a color. */
private int
mem_true32_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;
    bits32 a_color;

    declare_scan_ptr(dest);

    fit_fill(dev, x, y, w, h);
    a_color = arrange_bytes(color);
    setup_rect(dest);
    if (w <= 4)
	switch (w) {
		/*case 0: *//* not possible */
#define dest32 ((bits32 *)dest)
	    case 1:
		do {
		    dest32[0] = a_color;
		    inc_ptr(dest, draster);
		}
		while (--h > 0);
		break;
	    case 2:
		do {
		    dest32[1] = dest32[0] = a_color;
		    inc_ptr(dest, draster);
		}
		while (--h > 0);
		break;
	    case 3:
		do {
		    dest32[2] = dest32[1] = dest32[0] = a_color;
		    inc_ptr(dest, draster);
		}
		while (--h > 0);
		break;
	    case 4:
		do {
		    dest32[3] = dest32[2] = dest32[1] = dest32[0] = a_color;
		    inc_ptr(dest, draster);
		}
		while (--h > 0);
		break;
	    default:		/* not possible */
		;
    } else if (a_color == 0)
	do {
	    memset(dest, 0, w << 2);
	    inc_ptr(dest, draster);
	}
	while (--h > 0);
    else
	do {
	    bits32 *pptr = dest32;
	    int cnt = w;

	    do {
		pptr[3] = pptr[2] = pptr[1] = pptr[0] = a_color;
		pptr += 4;
	    }
	    while ((cnt -= 4) > 4);
	    do {
		*pptr++ = a_color;
	    } while (--cnt > 0);
	    inc_ptr(dest, draster);
	}
	while (--h > 0);
#undef dest32
    return 0;
}

/* Copy a monochrome bitmap. */
private int
mem_true32_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;
    bits32 a_zero = arrange_bytes(zero);
    bits32 a_one = arrange_bytes(one);
    const byte *line;

    declare_scan_ptr(dest);
    fit_copy(dev, base, sourcex, sraster, id, x, y, w, h);
    setup_rect(dest);
    line = base + (sourcex >> 3);
    if (zero == gx_no_color_index) {
	int first_bit = sourcex & 7;
	int w_first = min(w, 8 - first_bit);
	int w_rest = w - w_first;

	if (one == gx_no_color_index)
	    return 0;
	/*
	 * There are no halftones, so this case -- characters --
	 * is the only common one.
	 */
	while (h-- > 0) {
	    bits32 *pptr = (bits32 *) dest;
	    const byte *sptr = line;
	    int sbyte = (*sptr++ << first_bit) & 0xff;
	    int count = w_first;

	    if (sbyte)
		do {
		    if (sbyte & 0x80)
			*pptr = a_one;
		    sbyte <<= 1;
		    pptr++;
		}
		while (--count > 0);
	    else
		pptr += count;
	    for (count = w_rest; count >= 8; count -= 8, pptr += 8) {
		sbyte = *sptr++;
		if (sbyte) {
		    if (sbyte & 0x80) pptr[0] = a_one;
		    if (sbyte & 0x40) pptr[1] = a_one;
		    if (sbyte & 0x20) pptr[2] = a_one;
		    if (sbyte & 0x10) pptr[3] = a_one;
		    if (sbyte & 0x08) pptr[4] = a_one;
		    if (sbyte & 0x04) pptr[5] = a_one;
		    if (sbyte & 0x02) pptr[6] = a_one;
		    if (sbyte & 0x01) pptr[7] = a_one;
		}
	    }
	    if (count) {
		sbyte = *sptr;
		do {
		    if (sbyte & 0x80)
			*pptr = a_one;
		    sbyte <<= 1;
		    pptr++;
		}
		while (--count > 0);
	    }
	    line += sraster;
	    inc_ptr(dest, draster);
	}
    } else {			/* zero != gx_no_color_index */
	int first_bit = 0x80 >> (sourcex & 7);

	while (h-- > 0) {
	    bits32 *pptr = (bits32 *) dest;
	    const byte *sptr = line;
	    int sbyte = *sptr++;
	    int bit = first_bit;
	    int count = w;

	    do {
		if (sbyte & bit) {
		    if (one != gx_no_color_index)
			*pptr = a_one;
		} else
		    *pptr = a_zero;
		if ((bit >>= 1) == 0)
		    bit = 0x80, sbyte = *sptr++;
		pptr++;
	    }
	    while (--count > 0);
	    line += sraster;
	    inc_ptr(dest, draster);
	}
    }
    return 0;
}

/* Copy a color bitmap. */
private int
mem_true32_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(mem32_word_copy_mono, mem32_word_copy_color, mem32_word_fill_rectangle);

/* Here is the device descriptor. */
const gx_device_memory mem_true32_word_device =
mem_full_device("image32w", 24, 8, mem_open,
		gx_default_map_rgb_color, gx_default_map_color_rgb,
     mem32_word_copy_mono, mem32_word_copy_color, mem32_word_fill_rectangle,
	    gx_default_cmyk_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
mem32_word_fill_rectangle(gx_device * dev, int x, int y, int w, int h,
			  gx_color_index color)
{
    return mem_true32_fill_rectangle(dev, x, y, w, h,
				     color_swap_bytes(color));
}

/* Copy a bitmap. */
private int
mem32_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)
{
    return mem_true32_copy_mono(dev, base, sourcex, sraster, id,
				x, y, w, h, color_swap_bytes(zero),
				color_swap_bytes(one));
}

/* Copy a color bitmap. */
private int
mem32_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;
    bytes_copy_rectangle(row + (x << 2), raster, base + (sourcex << 2),
			 sraster, w << 2, h);
    mem_swap_byte_rect(row, raster, x << 5, w << 5, h, false);
    return 0;
}

#endif /* !arch_is_big_endian */
