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GSDEVICE.C
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1992-03-04
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/* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved.
Distributed by Free Software Foundation, Inc.
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 "gxfixed.h" /* ditto */
#include "gxmatrix.h" /* for gzstate.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_tile_rectangle(null_tile_rectangle);
private dev_proc_copy_mono(null_copy_mono);
private dev_proc_draw_line(null_draw_line);
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,
null_tile_rectangle,
null_copy_mono,
gx_default_copy_color,
null_draw_line,
gx_default_get_bits,
gx_default_get_props,
gx_default_put_props
};
private gx_device null_device = {
sizeof(device),
&null_procs,
"null",
0, 0,
72, 72,
no_margins,
dci_black_and_white,
1
};
/* The null device */
gx_device *gx_device_null_p = &null_device;
/* 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_bytes_per_scan_line(dev, 0);
int code = (*dev->procs->get_bits)(dev, start_y, data, size, 0);
uint count;
if ( code < 0 ) return_error(gs_error_undefined);
count = size / line_size;
if ( plines_copied != NULL )
*plines_copied = count;
if ( pbytes_copied != NULL )
*pbytes_copied = count * line_size;
return 0;
}
/* Get the current device from the graphics state */
gx_device *
gs_currentdevice(gs_state *pgs)
{ return pgs->device->info;
}
/* Get the name of a device */
char *
gs_devicename(gx_device *dev)
{ return dev->dname;
}
/* Get the initial matrix of a device. */
void
gs_deviceinitialmatrix(gx_device *dev, gs_matrix *pmat)
{ (*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 */
}
/* Cloning an existing device. */
int
gs_copydevice(gx_device **pnew_dev, gx_device *dev, proc_alloc_t palloc)
{ register gx_device *new_dev;
new_dev = (gx_device *)(*palloc)(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, gs_matrix *pmat,
uint width, uint height, byte *colors, int num_colors, proc_alloc_t palloc)
{ gx_device_memory *old_dev;
register gx_device_memory *new_dev;
byte *bits;
int palette_size = num_colors;
int bpp = 1;
int pcount;
int bits_per_pixel;
float x_pixels_per_unit, y_pixels_per_unit;
ulong bitmap_size;
byte palette[256 * 3];
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 )
{ byte *p, *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 the initial matrix is of the form [A 0 0 B X Y].
* Then the size of the image in user units is (W/|A|,H/|B|),
* hence the size in inches is ((W/|A|)/72,(H/|B|)/72), so
* the number of pixels per inch is
* (W/((W/|A|)/72),H/((H/|B|)/72)), or (|A|*72,|B|*72).
* Similarly, if the initial matrix is [0 A B 0 X Y] for a 90
* or 270 degree rotation, the size of the image in user
* units is (W/|B|,H/|A|), so the pixels per inch are
* (|B|*72,|A|*72). We forbid non-orthogonal transformation
* matrices.
*/
if ( is_fzero2(pmat->xy, pmat->yx) )
x_pixels_per_unit = pmat->xx, y_pixels_per_unit = pmat->yy;
else if ( is_fzero2(pmat->xx, pmat->yy) )
x_pixels_per_unit = pmat->yx, y_pixels_per_unit = pmat->xy;
else
return_error(gs_error_undefinedresult);
/* All checks done, allocate the device. */
new_dev = (gx_device_memory *)(*palloc)(1, old_dev->params_size, "gs_makeimagedevice(device)");
if ( new_dev == 0 ) return_error(gs_error_VMerror);
*new_dev = *old_dev;
new_dev->initial_matrix = *pmat;
new_dev->width = width;
new_dev->height = height;
new_dev->x_pixels_per_inch = fabs(x_pixels_per_unit) * 72;
new_dev->y_pixels_per_inch = fabs(y_pixels_per_unit) * 72;
if ( !has_color )
new_dev->color_info.max_rgb = 0,
new_dev->color_info.dither_rgb = 0;
bitmap_size = gdev_mem_bitmap_size(new_dev);
if ( bitmap_size > max_uint ) /* can't allocate it! */
return_error(gs_error_limitcheck);
bits = (byte *)(*palloc)(1, (uint)bitmap_size + pcount,
"gs_makeimagedevice(bits)");
if ( bits == 0 ) return_error(gs_error_VMerror);
new_dev->base = bits;
new_dev->invert = (palette[0] | palette[1] | palette[2] ? -1 : 0); /* bogus */
new_dev->palette_size = palette_size;
new_dev->palette = bits + bitmap_size;
memcpy(new_dev->palette, palette, pcount);
new_dev->is_open = 0;
*pnew_dev = (gx_device *)new_dev;
return 0;
}
/* Set the device in the graphics state */
int
gs_setdevice(gs_state *pgs, gx_device *dev)
{ register device *pdev = pgs->device;
int was_open = dev->is_open;
int code;
/* Initialize the device */
if ( !was_open )
{ code = (*dev->procs->open_device)(dev);
if ( code < 0 ) return_error(code);
dev->is_open = 1;
}
/* Compute device white and black codes */
pdev->black = (*dev->procs->map_rgb_color)(dev, 0, 0, 0);
pdev->white = (*dev->procs->map_rgb_color)(dev, gx_max_color_value, gx_max_color_value, gx_max_color_value);
pdev->info = dev;
if ( (code = gs_initmatrix(pgs)) < 0 ||
(code = gs_initclip(pgs)) < 0
)
return code;
if ( !was_open )
if ( (code = gs_erasepage(pgs)) < 0 )
return code;
return gx_remap_color(pgs);
}
/* Select the null device. This is just a convenience. */
void
gs_nulldevice(gs_state *pgs)
{ gs_setdevice(pgs, gx_device_null_p);
}
/* Close a device. The client is responsible for ensuring that */
/* this device is not current in any graphics state. */
int
gs_closedevice(gx_device *dev)
{ int code = 0;
if ( dev->is_open )
{ code = (*dev->procs->close_device)(dev);
if ( code < 0 ) return_error(code);
dev->is_open = 0;
}
return code;
}
/* Install enough of a null device to suppress graphics output */
/* during the execution of stringwidth. */
void
gx_device_no_output(gs_state *pgs)
{ pgs->device->info = &null_device;
}
/* Read the native color space of the current device. */
gs_color_space
gx_device_color_space(gs_state *pgs)
{ return (gx_device_has_color(pgs->device->info) ?
gs_color_space_DeviceRGB : gs_color_space_DeviceGray);
}
/* Just set the device without reinitializing. */
/* (For internal use only.) */
void
gx_set_device_only(gs_state *pgs, gx_device *dev)
{ pgs->device->info = dev;
}
/* Compute the size of one scan line for a device, */
/* with or without padding to a word boundary. */
uint
gx_device_bytes_per_scan_line(gx_device *dev, int pad)
{ ulong bits = (ulong)dev->width * dev->color_info.depth;
return (pad ?
(uint)((bits + 31) >> 5) << 2 :
(uint)((bits + 7) >> 3));
}
/* ------ The null `device' ------ */
private int
null_fill_rectangle(gx_device *dev, int x, int y, int w, int h,
gx_color_index color)
{ return 0;
}
private int
null_tile_rectangle(gx_device *dev, gx_bitmap *tile,
int x, int y, int w, int h, gx_color_index zero, gx_color_index one,
int px, int py)
{ return 0;
}
private int
null_copy_mono(gx_device *dev, byte *data,
int dx, int raster, gx_bitmap_id id, int x, int y, int w, int h,
gx_color_index zero, gx_color_index one)
{ return 0;
}
private int
null_draw_line(gx_device *dev, int x0, int y0, int x1, int y1,
gx_color_index color)
{ return 0;
}
/* ------ Default device procedures ------ */
int
gx_default_open_device(gx_device *dev)
{ return 0;
}
void
gx_default_get_initial_matrix(register gx_device *dev, register gs_matrix *pmat)
{ pmat->xx = dev->x_pixels_per_inch / 72.0;
pmat->xy = 0;
pmat->yx = 0;
pmat->yy = dev->y_pixels_per_inch / -72.0;
pmat->tx = 0;
pmat->ty = dev->height; /****** WRONG for devices with ******/
/****** arbitrary initial matrix ******/
}
int
gx_default_sync_output(gx_device *dev)
{ return 0;
}
int
gx_default_output_page(gx_device *dev, int num_copies, int flush)
{ return (*dev->procs->sync_output)(dev);
}
int
gx_default_close_device(gx_device *dev)
{ return 0;
}
gx_color_index
gx_default_map_rgb_color(gx_device *dev,
gx_color_value r, gx_color_value g, gx_color_value b)
{ /* Map values >= 1/2 to 1, < 1/2 to 0. */
return ((r | g | b) > gx_max_color_value / 2 ?
(gx_color_index)1 : (gx_color_index)0);
}
int
gx_default_map_color_rgb(gx_device *dev, gx_color_index color,
gx_color_value prgb[3])
{ /* Map 1 to max_value, 0 to 0. */
prgb[0] = prgb[1] = prgb[2] = -(gx_color_value)color;
return 0;
}
int
gx_default_copy_color(gx_device *dev, unsigned char *data,
int data_x, int raster, gx_bitmap_id id,
int x, int y, int width, int height)
{ return (*dev->procs->copy_mono)(dev, data, data_x, raster, id,
x, y, width, height, (gx_color_index)0, (gx_color_index)1);
}
int
gx_default_get_bits(gx_device *dev, int y,
unsigned char *data, unsigned int size, int pad)
{ return -1;
}
/* Standard device properties */
private gs_prop_item props_std[] = {
prop_def("HWResolution", prt_float_array),
prop_def("HWSize", prt_int_array),
/* Following cannot be set yet */
prop_def("InitialMatrix", prt_float_array),
/* Following cannot be set */
prop_def("Name", prt_string),
/* Slots for arrays */
prop_float, prop_float,
prop_int, prop_int,
prop_float, prop_float, prop_float, prop_float,
prop_float, prop_float
};
/* Get standard properties */
int
gx_default_get_props(register gx_device *dev, register gs_prop_item *plist)
{ if ( plist != 0 )
{ register gs_prop_item *pi;
gs_matrix mat;
memcpy(plist, props_std, sizeof(props_std));
plist[0].value.a.size = 2;
plist[1].value.a.size = 2;
plist[2].value.a.size = 6;
plist[3].value.a.p.s = dev->dname;
plist[3].value.a.size = -1;
pi = &plist[4];
/* resolution array */
plist[0].value.a.p.v = pi;
pi[0].value.f = dev->x_pixels_per_inch;
pi[1].value.f = dev->y_pixels_per_inch;
pi += 2;
/* width/height array */
plist[1].value.a.p.v = pi;
pi[0].value.i = dev->width;
pi[1].value.i = dev->height;
pi += 2;
/* matrix */
plist[2].value.a.p.v = pi;
(*dev->procs->get_initial_matrix)(dev, &mat);
pi[0].value.f = mat.xx;
pi[1].value.f = mat.xy;
pi[2].value.f = mat.yx;
pi[3].value.f = mat.yy;
pi[4].value.f = mat.tx;
pi[5].value.f = mat.ty;
pi += 6;
}
return sizeof(props_std) / sizeof(gs_prop_item);
}
/* Set standard properties */
int
gx_default_put_props(gx_device *dev, gs_prop_item *plist, int count)
{ gs_prop_item *known[2];
props_extract(plist, count, props_std, 2, known, 1);
if ( known[0] != 0 )
{ if ( known[0]->value.a.size != 2 )
known[0]->status = pv_typecheck;
else
{ gs_prop_item *ap = known[0]->value.a.p.v;
if ( ap[0].value.f <= 0 || ap[1].value.f <= 0 )
known[0]->status = pv_rangecheck;
else
{ dev->x_pixels_per_inch = ap[0].value.f;
dev->y_pixels_per_inch = ap[1].value.f;
}
}
}
if ( known[1] != 0 )
{ if ( known[1]->value.a.size != 2 )
known[1]->status = pv_typecheck;
else
{ gs_prop_item *ap = known[1]->value.a.p.v;
if ( ap[0].value.i <= 0 || ap[0].value.i > 0x7fff ||
ap[1].value.i <= 0 || ap[1].value.i > 0x7fff
)
known[1]->status = pv_rangecheck;
else
{ dev->width = ap[0].value.i;
dev->height = ap[1].value.i;
}
}
}
return 0;
}