/* Copyright (C) 1993, 1994 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.
*/

/* gdevmpla.c */
/* Any-depth planar "memory" (stored bitmap) devices */
#include "memory_.h"
#include "gx.h"
#include "gxdevice.h"
#include "gxdevmem.h"			/* semi-public definitions */
#include "gdevmem.h"			/* private definitions */

/*
 * Planar memory devices store the bits by planes instead of by chunks.
 * The plane corresponding to the least significant bit of the color index
 * is stored first.
 *
 * The current implementations are quite inefficient.
 * We may improve them someday if anyone cares.
 */

/* Procedures */
declare_mem_map_procs(mem_planar_map_rgb_color, mem_planar_map_color_rgb);
declare_mem_procs(mem_planar_copy_mono, mem_planar_copy_color, mem_planar_fill_rectangle);

/* The device descriptor. */
/* The instance is public. */
/* The default instance has depth = 1, but clients may set this */
/* to other values before opening the device. */
private dev_proc_open_device(mem_planar_open);
private dev_proc_get_bits(mem_planar_get_bits);
const gx_device_memory far_data mem_planar_device =
  mem_full_device("image(planar)", 0, 1, mem_planar_open,
    mem_planar_map_rgb_color, mem_planar_map_color_rgb,
    mem_planar_copy_mono, mem_planar_copy_color, mem_planar_fill_rectangle,
    mem_planar_get_bits, gx_default_map_cmyk_color,
    gx_default_strip_tile_rectangle, gx_no_strip_copy_rop);

/* Open a planar memory device. */
private int
mem_planar_open(gx_device *dev)
{	/* Temporarily reset the parameters, and call */
	/* the generic open procedure. */
	int depth = dev->color_info.depth;
	int height = dev->height;
	int code;

	dev->height *= depth;
	dev->color_info.depth = 1;
	code = mem_open(dev);
	dev->height = height;
	dev->color_info.depth = depth;
	return code;
}

/* Map a r-g-b color to a color index. */
private gx_color_index
mem_planar_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g,
  gx_color_value b)
{	int depth = dev->color_info.depth;
	return (*dev_proc(gdev_mem_device_for_bits(depth), map_rgb_color))
	  (dev, r, g, b);
}

/* Map a color index to a r-g-b color. */
private int
mem_planar_map_color_rgb(gx_device *dev, gx_color_index color,
  gx_color_value prgb[3])
{	int depth = dev->color_info.depth;
	return (*dev_proc(gdev_mem_device_for_bits(depth), map_color_rgb))
	  (dev, color, prgb);
}

/* Fill a rectangle with a color. */
private int
mem_planar_fill_rectangle(gx_device *dev,
  int x, int y, int w, int h, gx_color_index color)
{	byte **ptrs = mdev->line_ptrs;
	int i;
	for ( i = 0; i < dev->color_info.depth;
	      i++, mdev->line_ptrs += dev->height
	    )
	  (*dev_proc(&mem_mono_device, fill_rectangle))(dev,
			x, y, w, h, (color >> i) & 1);
	mdev->line_ptrs = ptrs;
	return 0;
}

/* Copy a bitmap. */
private int
mem_planar_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)
{	byte **ptrs = mdev->line_ptrs;
	int i;
	for ( i = 0; i < dev->color_info.depth;
	      i++, mdev->line_ptrs += dev->height
	    )
	  (*dev_proc(&mem_mono_device, copy_mono))(dev,
			base, sourcex, sraster, id, x, y, w, h,
			(zero == gx_no_color_index ? gx_no_color_index :
			 (zero >> i) & 1),
			(one == gx_no_color_index ? gx_no_color_index :
			 (one >> i) & 1));
	mdev->line_ptrs = ptrs;
	return 0;
}

/* Copy a color bitmap. */
/* This is very slow and messy. */
private int
mem_planar_copy_color(gx_device *dev,
  const byte *base, int sourcex, int sraster, gx_bitmap_id id,
  int x, int y, int w, int h)
{	byte **ptrs = mdev->line_ptrs;
	int depth = dev->color_info.depth; 
	int wleft = w;
	int hleft = h;
	const byte *srow = base;
	int ynext = y;
#define max_w 32
	union _b {
		long l[max_w / sizeof(long)];
		byte b[max_w / 8];
	} buf;

	while ( wleft > max_w )
	{	mem_planar_copy_color(dev, base,
			sourcex + wleft - max_w, sraster, gx_no_bitmap_id,
			x + wleft - max_w, y, max_w, h);
		wleft -= max_w;
	}
	for ( ; hleft > 0;
	      srow += sraster, ynext++, hleft--,
		mdev->line_ptrs += dev->height
	    )
	{	int i;
		for ( i = 0; i < depth;
		      i++, mdev->line_ptrs += dev->height
		    )
		{	int sx, bx;
			memset(buf.b, 0, sizeof(buf.b));
			for ( sx = 0, bx = sourcex * depth + depth - 1 - i;
			      sx < w; sx++, bx += depth
			    )
				if ( srow[bx >> 3] & (0x80 >> (bx & 7)) )
					buf.b[sx >> 3] |= 0x80 >> (sx & 7);
			(*dev_proc(&mem_mono_device, copy_mono))(dev,
				buf.b, 0, sizeof(buf), gx_no_bitmap_id,
				x, ynext, w, 1,
				(gx_color_index)0, (gx_color_index)1);
		}
		mdev->line_ptrs = ptrs;
	}
	return 0;
}

/* Copy bits back from a planar memory device. */
/****** NOT IMPLEMENTED YET ******/
private int
mem_planar_get_bits(gx_device *dev, int y, byte *str, byte **actual_data)
{	return -1;
}
