1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* Copyright (C) 2001-2012 Artifex Software, Inc.
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.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, San Rafael,
CA 94903, U.S.A., +1(415)492-9861, for further information.
*/
/* Memory device creation for Ghostscript library */
#include "math_.h" /* for fabs */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsdevice.h" /* for prototypes */
#include "gxarith.h"
#include "gxdevice.h"
#include "gxdevmem.h"
/* Make a memory (image) device. */
/* If colors_size = -16, -24, or -32, this is a true-color device; */
/* otherwise, colors_size is the size of the palette in bytes */
/* (2^N for gray scale, 3*2^N for RGB color). */
/* We separate device allocation and initialization at customer request. */
int
gs_initialize_wordimagedevice(gx_device_memory * new_dev, const gs_matrix * pmat,
uint width, uint height, const byte * colors, int colors_size,
bool word_oriented, bool page_device, gs_memory_t * mem)
{
const gx_device_memory *proto_dev;
int palette_count = colors_size;
int num_components = 1;
int pcount;
int bits_per_pixel;
float x_pixels_per_unit, y_pixels_per_unit;
byte palette[256 * 3];
bool has_color;
switch (colors_size) {
case 3 * 2:
palette_count = 2;
num_components = 3;
case 2:
bits_per_pixel = 1;
break;
case 3 * 4:
palette_count = 4;
num_components = 3;
case 4:
bits_per_pixel = 2;
break;
case 3 * 16:
palette_count = 16;
num_components = 3;
case 16:
bits_per_pixel = 4;
break;
case 3 * 256:
palette_count = 256;
num_components = 3;
case 256:
bits_per_pixel = 8;
break;
case -16:
bits_per_pixel = 16;
palette_count = 0;
break;
case -24:
bits_per_pixel = 24;
palette_count = 0;
break;
case -32:
bits_per_pixel = 32;
palette_count = 0;
break;
default:
return_error(gs_error_rangecheck);
}
proto_dev = (word_oriented ?
gdev_mem_word_device_for_bits(bits_per_pixel) :
gdev_mem_device_for_bits(bits_per_pixel));
if (proto_dev == 0) /* no suitable device */
return_error(gs_error_rangecheck);
pcount = palette_count * 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 = false;
for (i = 0, p = colors, q = palette;
i < palette_count; i++, q += 3
) {
int mask = 1;
switch (num_components) {
case 1: /* gray */
q[0] = q[1] = q[2] = *p++;
break;
default /* case 3 */ : /* RGB */
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 = true;
}
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 = true;
/*
* 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, initialize the device. */
if (bits_per_pixel == 1) {
/* Determine the polarity from the palette. */
gs_make_mem_device(new_dev, proto_dev, mem,
(page_device ? 1 : -1), 0);
/* This is somewhat bogus, but does the right thing */
/* in the only cases we care about. */
gdev_mem_mono_set_inverted(new_dev,
(palette[0] | palette[1] | palette[2]) != 0);
} else {
byte *dev_palette = gs_alloc_string(mem, pcount,
"gs_makeimagedevice(palette)");
if (dev_palette == 0)
return_error(gs_error_VMerror);
gs_make_mem_device(new_dev, proto_dev, mem,
(page_device ? 1 : -1), 0);
new_dev->palette.size = pcount;
new_dev->palette.data = dev_palette;
memcpy(dev_palette, palette, pcount);
if (!has_color) {
new_dev->color_info.num_components = 1;
new_dev->color_info.max_color = 0;
new_dev->color_info.dither_colors = 0;
new_dev->color_info.gray_index = 0;
}
}
/* Memory defice is always initialised as an internal device but */
/* this is an external device */
new_dev->retained = true;
rc_init(new_dev, new_dev->memory, 1);
new_dev->initial_matrix = *pmat;
new_dev->MarginsHWResolution[0] = new_dev->HWResolution[0] =
fabs(x_pixels_per_unit) * 72;
new_dev->MarginsHWResolution[1] = new_dev->HWResolution[1] =
fabs(y_pixels_per_unit) * 72;
gx_device_set_width_height((gx_device *) new_dev, width, height);
/* Set the ImagingBBox so we get a correct clipping region. */
{
gs_rect bbox;
bbox.p.x = 0;
bbox.p.y = 0;
bbox.q.x = width;
bbox.q.y = height;
gs_bbox_transform_inverse(&bbox, pmat, &bbox);
new_dev->ImagingBBox[0] = bbox.p.x;
new_dev->ImagingBBox[1] = bbox.p.y;
new_dev->ImagingBBox[2] = bbox.q.x;
new_dev->ImagingBBox[3] = bbox.q.y;
new_dev->ImagingBBox_set = true;
}
/* The bitmap will be allocated when the device is opened. */
new_dev->is_open = false;
new_dev->bitmap_memory = mem;
return 0;
}
int
gs_makewordimagedevice(gx_device ** pnew_dev, const gs_matrix * pmat,
uint width, uint height, const byte * colors, int num_colors,
bool word_oriented, bool page_device, gs_memory_t * mem)
{
int code;
gx_device_memory *pnew =
gs_alloc_struct(mem, gx_device_memory, &st_device_memory,
"gs_makeimagedevice(device)");
if (pnew == 0)
return_error(gs_error_VMerror);
/* Bug #697450 "Null pointer dereference in gx_device_finalize()"
* If we have incorrect data passed to gs_initialise_wordimagedevice() then the
* initialisation will fail, crucially it will fail *before* it calls
* gs_make_mem_device() which initialises the device. This means that the
* icc_struct member will be uninitialsed, but the device finalise method
* will unconditionally free that memory. Since its a garbage pointer, bad things happen.
* Apparently we do still need makeimagedevice to be available from
* PostScript, so in here just zero the device memory, which means that
* the finalise routine won't have a problem.
*/
memset(pnew, 0x00, st_device_memory.ssize);
code = gs_initialize_wordimagedevice(pnew, pmat, width, height,
colors, num_colors, word_oriented,
page_device, mem);
if (code < 0) {
gs_free_object(mem, pnew, "gs_makeimagedevice(device)");
return code;
}
*pnew_dev = (gx_device *) pnew;
return 0;
}
|
