xref: /plan9/sys/src/cmd/gs/src/gdevbit.c (revision 593dc095aefb2a85c828727bbfa9da139a49bdf4)

/* Copyright (C) 1991, 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: gdevbit.c,v 1.10 2004/06/23 18:57:15 stefan Exp $ */
/* "Plain bits" devices to measure rendering time. */
#include "math_.h"
#include "gdevprn.h"
#include "gsparam.h"
#include "gscrd.h"
#include "gscrdp.h"
#include "gxlum.h"
#include "gdevdcrd.h"

/* Define the device parameters. */
#ifndef X_DPI
#  define X_DPI 72
#endif
#ifndef Y_DPI
#  define Y_DPI 72
#endif

/* The device descriptor */
private dev_proc_map_rgb_color(bit_mono_map_color);
private dev_proc_map_color_rgb(bit_map_color_rgb);
private dev_proc_map_cmyk_color(bit_map_cmyk_color);
private dev_proc_get_params(bit_get_params);
private dev_proc_put_params(bit_put_params);
private dev_proc_print_page(bit_print_page);

#define bit_procs(encode_color)\
{	gdev_prn_open,\
	gx_default_get_initial_matrix,\
	NULL,	/* sync_output */\
	gdev_prn_output_page,\
	gdev_prn_close,\
	encode_color,	/* map_rgb_color */\
	bit_map_color_rgb,	/* map_color_rgb */\
	NULL,	/* fill_rectangle */\
	NULL,	/* tile_rectangle */\
	NULL,	/* copy_mono */\
	NULL,	/* copy_color */\
	NULL,	/* draw_line */\
	NULL,	/* get_bits */\
	bit_get_params,\
	bit_put_params,\
	encode_color,	/* map_cmyk_color */\
	NULL,	/* get_xfont_procs */\
	NULL,	/* get_xfont_device */\
	NULL,	/* map_rgb_alpha_color */\
	gx_page_device_get_page_device,	/* get_page_device */\
	NULL,	/* get_alpha_bits */\
	NULL,	/* copy_alpha */\
	NULL,	/* get_band */\
	NULL,	/* copy_rop */\
	NULL,	/* fill_path */\
	NULL,	/* stroke_path */\
	NULL,	/* fill_mask */\
	NULL,	/* fill_trapezoid */\
	NULL,	/* fill_parallelogram */\
	NULL,	/* fill_triangle */\
	NULL,	/* draw_thin_line */\
	NULL,	/* begin_image */\
	NULL,	/* image_data */\
	NULL,	/* end_image */\
	NULL,	/* strip_tile_rectangle */\
	NULL,	/* strip_copy_rop */\
	NULL,	/* get_clipping_box */\
	NULL,	/* begin_typed_image */\
	NULL,	/* get_bits_rectangle */\
	NULL,	/* map_color_rgb_alpha */\
	NULL,	/* create_compositor */\
	NULL,	/* get_hardware_params */\
	NULL,	/* text_begin */\
	NULL,	/* finish_copydevice */\
	NULL,	/* begin_transparency_group */\
	NULL,	/* end_transparency_group */\
	NULL,	/* begin_transparency_mask */\
	NULL,	/* end_transparency_mask */\
	NULL,	/* discard_transparency_layer */\
	NULL,	/* get_color_mapping_procs */\
	NULL,	/* get_color_comp_index */\
	encode_color,		/* encode_color */\
	bit_map_color_rgb	/* decode_color */\
}

/*
 * The following macro is used in get_params and put_params to determine the
 * num_components for the current device. It works using the device name
 * character after "bit" which is either '\0', 'r', or 'c'. Any new devices
 * that are added to this module must modify this macro to return the
 * correct num_components. This is needed to support the ForceMono
 * parameter, which alters dev->num_components.
 */
#define REAL_NUM_COMPONENTS(dev) (dev->dname[3] == 'c' ? 4 : \
				  dev->dname[3] == 'r' ? 3 : 1)

private const gx_device_procs bitmono_procs =
bit_procs(bit_mono_map_color);
const gx_device_printer gs_bit_device =
{prn_device_body(gx_device_printer, bitmono_procs, "bit",
		 DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
		 X_DPI, Y_DPI,
		 0, 0, 0, 0,    /* margins */
		 1, 1, 1, 0, 2, 1, bit_print_page)
};

private const gx_device_procs bitrgb_procs =
bit_procs(gx_default_rgb_map_rgb_color);
const gx_device_printer gs_bitrgb_device =
{prn_device_body(gx_device_printer, bitrgb_procs, "bitrgb",
		 DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
		 X_DPI, Y_DPI,
		 0, 0, 0, 0,	/* margins */
		 3, 4, 1, 1, 2, 2, bit_print_page)
};

private const gx_device_procs bitcmyk_procs =
bit_procs(bit_map_cmyk_color);
const gx_device_printer gs_bitcmyk_device =
{prn_device_body(gx_device_printer, bitcmyk_procs, "bitcmyk",
		 DEFAULT_WIDTH_10THS, DEFAULT_HEIGHT_10THS,
		 X_DPI, Y_DPI,
		 0, 0, 0, 0,	/* margins */
		 4, 4, 1, 1, 2, 2, bit_print_page)
};

/* Map gray to color. */
/* Note that 1-bit monochrome is a special case. */
private gx_color_index
bit_mono_map_color(gx_device * dev, const gx_color_value cv[])
{
    int bpc = dev->color_info.depth;
    int drop = sizeof(gx_color_value) * 8 - bpc;
    gx_color_value gray = cv[0];

    return (bpc == 1 ? gx_max_color_value - gray : gray) >> drop;
}

/* Map color to RGB.  This has 3 separate cases, but since it is rarely */
/* used, we do a case test rather than providing 3 separate routines. */
private int
bit_map_color_rgb(gx_device * dev, gx_color_index color, gx_color_value cv[4])
{
    int depth = dev->color_info.depth;
    int ncomp = REAL_NUM_COMPONENTS(dev);
    int bpc = depth / ncomp;
    uint mask = (1 << bpc) - 1;

#define cvalue(c) ((gx_color_value)((ulong)(c) * gx_max_color_value / mask))

    switch (ncomp) {
	case 1:		/* gray */
	    cv[0] =
		(depth == 1 ? (color ? 0 : gx_max_color_value) :
		 cvalue(color));
	    break;
	case 3:		/* RGB */
	    {
		gx_color_index cshift = color;

		cv[2] = cvalue(cshift & mask);
		cshift >>= bpc;
		cv[1] = cvalue(cshift & mask);
		cv[0] = cvalue(cshift >> bpc);
	    }
	    break;
	case 4:		/* CMYK */
	    /* Map CMYK back to RGB. */
	    {
		gx_color_index cshift = color;
		uint c, m, y, k;

		k = cshift & mask;
		cshift >>= bpc;
		y = cshift & mask;
		cshift >>= bpc;
		m = cshift & mask;
		c = cshift >> bpc;
		/* We use our improved conversion rule.... */
		cv[0] = cvalue((mask - c) * (mask - k) / mask);
		cv[1] = cvalue((mask - m) * (mask - k) / mask);
		cv[2] = cvalue((mask - y) * (mask - k) / mask);
	    }
	    break;
    }
    return 0;
#undef cvalue
}

/* Map CMYK to color. */
private gx_color_index
bit_map_cmyk_color(gx_device * dev, const gx_color_value cv[])
{
    int bpc = dev->color_info.depth / 4;
    int drop = sizeof(gx_color_value) * 8 - bpc;
    gx_color_index color =
    (((((((gx_color_index) cv[0] >> drop) << bpc) +
	(cv[1] >> drop)) << bpc) +
      (cv[2] >> drop)) << bpc) +
    (cv[3] >> drop);

    return (color == gx_no_color_index ? color ^ 1 : color);
}

/* Get parameters.  We provide a default CRD. */
private int
bit_get_params(gx_device * pdev, gs_param_list * plist)
{
    int code, ecode;
    /*
     * The following is a hack to get the original num_components.
     * See comment above.
     */
    int real_ncomps = REAL_NUM_COMPONENTS(pdev);
    int ncomps = pdev->color_info.num_components;
    int forcemono = (ncomps == real_ncomps ? 0 : 1);

    /*
     * Temporarily set num_components back to the "real" value to avoid
     * confusing those that rely on it.
     */
    pdev->color_info.num_components = real_ncomps;

    ecode = gdev_prn_get_params(pdev, plist);
    code = sample_device_crd_get_params(pdev, plist, "CRDDefault");
	if (code < 0)
	    ecode = code;
    if ((code = param_write_int(plist, "ForceMono", &forcemono)) < 0) {
	ecode = code;
    }

    /* Restore the working num_components */
    pdev->color_info.num_components = ncomps;

    return ecode;
}

/* Set parameters.  We allow setting the number of bits per component. */
/* Also, ForceMono=1 forces monochrome output from RGB/CMYK devices. */
private int
bit_put_params(gx_device * pdev, gs_param_list * plist)
{
    gx_device_color_info save_info;
    int ncomps = pdev->color_info.num_components;
    int real_ncomps = REAL_NUM_COMPONENTS(pdev);
    int bpc = pdev->color_info.depth / real_ncomps;
    int v;
    int ecode = 0;
    int code;
    static const byte depths[4][16] = {
	{1, 2, 0, 4, 8, 0, 0, 8, 0, 0, 0, 16, 0, 0, 0, 16},
	{0},
	{4, 8, 0, 16, 16, 0, 0, 24, 0, 0, 0, 40, 0, 0, 0, 48},
	{4, 8, 0, 16, 32, 0, 0, 32, 0, 0, 0, 48, 0, 0, 0, 64}
    };
    const char *vname;

    /*
     * Temporarily set num_components back to the "real" value to avoid
     * confusing those that rely on it.
     */
    pdev->color_info.num_components = real_ncomps;

    if ((code = param_read_int(plist, (vname = "GrayValues"), &v)) != 1 ||
	(code = param_read_int(plist, (vname = "RedValues"), &v)) != 1 ||
	(code = param_read_int(plist, (vname = "GreenValues"), &v)) != 1 ||
	(code = param_read_int(plist, (vname = "BlueValues"), &v)) != 1
	) {
	if (code < 0)
	    ecode = code;
	else
	    switch (v) {
		case   2: bpc = 1; break;
		case   4: bpc = 2; break;
		case  16: bpc = 4; break;
		case  32: bpc = 5; break;
		case 256: bpc = 8; break;
		case 4096: bpc = 12; break;
		case 65536: bpc = 16; break;
		default:
		    param_signal_error(plist, vname,
				       ecode = gs_error_rangecheck);
	    }
    }

    switch (code = param_read_int(plist, (vname = "ForceMono"), &v)) {
    case 0:
	if (v == 1) {
	    ncomps = 1;
	    break;
	}
	else if (v == 0) {
	    ncomps = real_ncomps;
	    break;
	}
	code = gs_error_rangecheck;
    default:
	ecode = code;
	param_signal_error(plist, vname, ecode);
    case 1:
	break;
    }
    if (ecode < 0)
	return ecode;

    /*
     * Save the color_info in case gdev_prn_put_params fails, and for
     * comparison.  Note that depth is computed from real_ncomps.
     */
    save_info = pdev->color_info;
    pdev->color_info.depth = depths[real_ncomps - 1][bpc - 1];
    pdev->color_info.max_gray = pdev->color_info.max_color =
	(pdev->color_info.dither_grays =
	 pdev->color_info.dither_colors =
	 (1 << bpc)) - 1;
    ecode = gdev_prn_put_params(pdev, plist);
    if (ecode < 0) {
	pdev->color_info = save_info;
	return ecode;
    }
    /* Now restore/change num_components. This is done after other	*/
    /* processing since it is used in gx_default_put_params		*/
    pdev->color_info.num_components = ncomps;
    if (pdev->color_info.depth != save_info.depth ||
	pdev->color_info.num_components != save_info.num_components
	) {
	gs_closedevice(pdev);
    }
    /* Reset the map_cmyk_color procedure if appropriate. */
    if (dev_proc(pdev, map_cmyk_color) == cmyk_1bit_map_cmyk_color ||
	dev_proc(pdev, map_cmyk_color) == cmyk_8bit_map_cmyk_color ||
	dev_proc(pdev, map_cmyk_color) == bit_map_cmyk_color) {
	set_dev_proc(pdev, map_cmyk_color,
		     pdev->color_info.depth == 4 ? cmyk_1bit_map_cmyk_color :
		     pdev->color_info.depth == 32 ? cmyk_8bit_map_cmyk_color :
		     bit_map_cmyk_color);
    }
    /* Reset the sparable and linear shift, masks, bits. */
    set_linear_color_bits_mask_shift(pdev);
    pdev->color_info.separable_and_linear = GX_CINFO_SEP_LIN;
    return 0;
}

/* Send the page to the printer. */
private int
bit_print_page(gx_device_printer * pdev, FILE * prn_stream)
{				/* Just dump the bits on the file. */
    /* If the file is 'nul', don't even do the writes. */
    int line_size = gdev_mem_bytes_per_scan_line((gx_device *) pdev);
    byte *in = gs_alloc_bytes(pdev->memory, line_size, "bit_print_page(in)");
    byte *data;
    int nul = !strcmp(pdev->fname, "nul");
    int lnum = 0, bottom = pdev->height;

    if (in == 0)
	return_error(gs_error_VMerror);
    for (; lnum < bottom; ++lnum) {
	gdev_prn_get_bits(pdev, lnum, in, &data);
	if (!nul)
	    fwrite(data, 1, line_size, prn_stream);
    }
    gs_free_object(pdev->memory, in, "bit_print_page(in)");
    return 0;
}