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gsdevice.c
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1994-01-27
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/* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises. All rights reserved.
This file is part of Ghostscript.
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 Ghostscript General Public License for full details.
Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License. A copy of this license is supposed to have been
given to you along with 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. */
/* gsdevice.c */
/* Device operators for Ghostscript library */
#include "math_.h" /* for fabs */
#include "memory_.h" /* for memcpy */
#include "gx.h"
#include "gserrors.h"
#include "gsprops.h"
#include "gsutil.h"
#include "gxarith.h"
#include "gzstate.h"
#include "gzdevice.h"
#include "gxdevmem.h"
/* Import the device list from gdevs.c */
extern gx_device *gx_device_list[];
/* Device definitions */
/* Following defines the null device */
private dev_proc_fill_rectangle(null_fill_rectangle);
private dev_proc_copy_mono(null_copy_mono);
private dev_proc_get_xfont_procs(null_get_xfont_procs);
private dev_proc_get_xfont_device(null_get_xfont_device);
/* The null device procedure record is also used to fill in */
/* NULL procedures in actual devices, so it must be complete. */
private gx_device_procs null_procs = {
gx_default_open_device,
gx_default_get_initial_matrix,
gx_default_sync_output,
gx_default_output_page,
gx_default_close_device,
gx_default_map_rgb_color,
gx_default_map_color_rgb,
null_fill_rectangle,
gx_default_tile_rectangle,
null_copy_mono,
gx_default_copy_color,
gx_default_draw_line,
gx_default_get_bits,
gx_default_get_props,
gx_default_put_props,
gx_default_map_cmyk_color,
null_get_xfont_procs,
null_get_xfont_device
};
gx_device_null gs_null_device = {
sizeof(gx_device),
&null_procs,
"null",
0, 0,
72, 72,
no_margins,
dci_black_and_white,
1,
0 /* target */
};
/* Fill in a single procedure */
#define fill_default(procs, p, dproc)\
if ( (procs)->p == 0 ) (procs)->p = dproc
#define fill_proc(procs, p)\
fill_default(procs, p, null_procs.p)
/* Fill in NULL procedures in a device procedure record. */
void
gx_device_procs_complete(register gx_device_procs *procs)
{ fill_proc(procs, open_device);
fill_proc(procs, get_initial_matrix);
fill_proc(procs, sync_output);
fill_proc(procs, output_page);
fill_proc(procs, close_device);
fill_proc(procs, map_rgb_color);
fill_proc(procs, map_color_rgb);
/* NOT fill_rectangle */
fill_proc(procs, tile_rectangle);
/* NOT copy_mono */
fill_proc(procs, copy_color); /* Bogus? */
fill_proc(procs, draw_line);
fill_proc(procs, get_bits);
fill_proc(procs, get_props);
fill_proc(procs, put_props);
fill_proc(procs, map_cmyk_color);
fill_default(procs, get_xfont_procs, gx_default_get_xfont_procs);
fill_default(procs, get_xfont_device, gx_default_get_xfont_device);
}
void
gx_device_complete_procs(gx_device *dev)
{ gx_device_procs_complete(dev->procs);
}
/* Flush buffered output to the device */
int
gs_flushpage(gs_state *pgs)
{ gx_device *dev = pgs->device->info;
return (*dev->procs->sync_output)(dev);
}
/* Make the device output the accumulated page description */
int
gs_copypage(gs_state *pgs)
{ return gs_output_page(pgs, 1, 0);
}
int
gs_output_page(gs_state *pgs, int num_copies, int flush)
{ gx_device *dev = pgs->device->info;
return (*dev->procs->output_page)(dev, num_copies, flush);
}
/* Copy scan lines from an image device */
int
gs_copyscanlines(gx_device *dev, int start_y, byte *data, uint size,
int *plines_copied, uint *pbytes_copied)
{ uint line_size = gx_device_raster(dev, 0);
uint count = size / line_size;
uint i;
byte *dest = data;
for ( i = 0; i < count; i++, dest += line_size )
{ int code = (*dev->procs->get_bits)(dev, start_y + i, dest, NULL);
if ( code < 0 )
{ /* Might just be an overrun. */
if ( start_y + i == dev->height ) break;
return_error(code);
}
}
if ( plines_copied != NULL )
*plines_copied = i;
if ( pbytes_copied != NULL )
*pbytes_copied = i * line_size;
return 0;
}
/* Get the current device from the graphics state */
gx_device *
gs_currentdevice(const gs_state *pgs)
{ return pgs->device->info;
}
/* Get the name of a device */
const char *
gs_devicename(const gx_device *dev)
{ return dev->dname;
}
/* Get the initial matrix of a device. */
void
gs_deviceinitialmatrix(gx_device *dev, gs_matrix *pmat)
{ fill_proc(dev->procs, get_initial_matrix);
(*dev->procs->get_initial_matrix)(dev, pmat);
}
/* Get the N'th device from the known device list */
gx_device *
gs_getdevice(int index)
{ int i;
for ( i = 0; gx_device_list[i] != 0; i++ )
{ if ( i == index ) return gx_device_list[i];
}
return 0; /* index out of range */
}
/* Clone an existing device. */
int
gs_copydevice(gx_device **pnew_dev, const gx_device *dev, const gs_memory_procs *mprocs)
{ register gx_device *new_dev;
new_dev = (gx_device *)(*mprocs->alloc)(1, dev->params_size, "gs_copydevice");
if ( new_dev == 0 ) return_error(gs_error_VMerror);
memcpy(new_dev, dev, dev->params_size);
new_dev->is_open = 0;
*pnew_dev = new_dev;
return 0;
}
/* Make a memory (image) device. */
/* If num_colors = -16, -24, or -32, this is a true-color device; */
/* otherwise, num_colors is the number of elements in the palette */
/* (2^N or 3*2^N). */
int
gs_makeimagedevice(gx_device **pnew_dev, const gs_matrix *pmat,
uint width, uint height, const byte *colors, int num_colors,
const gs_memory_procs *mprocs)
{ const gx_device_memory *old_dev;
register gx_device_memory *new_dev;
int palette_size = num_colors;
int bpp = 1;
int pcount;
int bits_per_pixel;
float x_pixels_per_unit, y_pixels_per_unit;
byte palette[256 * 3];
byte *dev_palette;
int has_color;
if ( width <= 0 || height <= 0 ) return_error(gs_error_rangecheck);
switch ( num_colors )
{
case 3*2:
palette_size = 2; bpp = 3;
case 2:
bits_per_pixel = 1; break;
case 3*4:
palette_size = 4; bpp = 3;
case 4:
bits_per_pixel = 2; break;
case 3*16:
palette_size = 16; bpp = 3;
case 16:
bits_per_pixel = 4; break;
case 3*256:
palette_size = 256; bpp = 3;
case 256:
bits_per_pixel = 8; break;
case -16:
bits_per_pixel = 16; palette_size = 0; break;
case -24:
bits_per_pixel = 24; palette_size = 0; break;
case -32:
bits_per_pixel = 32; palette_size = 0; break;
default:
return_error(gs_error_rangecheck);
}
old_dev = gdev_mem_device_for_bits(bits_per_pixel);
if ( old_dev == 0 ) /* no suitable device */
return_error(gs_error_rangecheck);
pcount = palette_size * 3;
/* Check to make sure the palette contains white and black, */
/* and, if it has any colors, the six primaries. */
if ( bits_per_pixel <= 8 )
{ const byte *p;
byte *q;
int primary_mask = 0;
int i;
has_color = 0;
for ( i = 0, p = colors, q = palette;
i < palette_size; i++, q += 3
)
{ int mask = 1;
switch ( bpp )
{
case 1: /* gray */
q[0] = q[1] = q[2] = *p++;
break;
default: /* bpp == 3, colored */
q[0] = p[0], q[1] = p[1], q[2] = p[2];
p += 3;
}
#define shift_mask(b,n)\
switch ( b ) { case 0xff: mask <<= n; case 0: break; default: mask = 0; }
shift_mask(q[0], 4);
shift_mask(q[1], 2);
shift_mask(q[2], 1);
#undef shift_mask
primary_mask |= mask;
if ( q[0] != q[1] || q[0] != q[2] )
has_color = 1;
}
switch ( primary_mask )
{
case 129: /* just black and white */
if ( has_color ) /* color but no primaries */
return_error(gs_error_rangecheck);
case 255: /* full color */
break;
default:
return_error(gs_error_rangecheck);
}
}
else
has_color = 1;
/*
* The initial transformation matrix must map 1 user unit to
* 1/72". Let W and H be the width and height in pixels, and
* assume