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
248
249
|
/*
* The Python Imaging Library
* $Id$
*
* imaging access objects
*
* Copyright (c) Fredrik Lundh 2009.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
/* use Tests/make_hash.py to calculate these values */
#define ACCESS_TABLE_SIZE 27
#define ACCESS_TABLE_HASH 3078
static struct ImagingAccessInstance access_table[ACCESS_TABLE_SIZE];
static inline UINT32
hash(const char* mode)
{
UINT32 i = ACCESS_TABLE_HASH;
while (*mode)
i = ((i<<5) + i) ^ (UINT8) *mode++;
return i % ACCESS_TABLE_SIZE;
}
static ImagingAccess
add_item(const char* mode)
{
UINT32 i = hash(mode);
/* printf("hash %s => %d\n", mode, i); */
if (access_table[i].mode && strcmp(access_table[i].mode, mode) != 0) {
fprintf(stderr, "AccessInit: hash collision: %d for both %s and %s\n",
i, mode, access_table[i].mode);
exit(1);
}
access_table[i].mode = mode;
return &access_table[i];
}
/* fetch pointer to pixel line */
static void*
line_8(Imaging im, int x, int y)
{
return &im->image8[y][x];
}
static void*
line_16(Imaging im, int x, int y)
{
return &im->image8[y][x+x];
}
static void*
line_32(Imaging im, int x, int y)
{
return &im->image32[y][x];
}
/* fetch individual pixel */
static void
get_pixel(Imaging im, int x, int y, void* color)
{
char* out = color;
/* generic pixel access*/
if (im->image8) {
out[0] = im->image8[y][x];
} else {
UINT8* p = (UINT8*) &im->image32[y][x];
if (im->type == IMAGING_TYPE_UINT8 && im->bands == 2) {
out[0] = p[0];
out[1] = p[3];
return;
}
memcpy(out, p, im->pixelsize);
}
}
static void
get_pixel_8(Imaging im, int x, int y, void* color)
{
char* out = color;
out[0] = im->image8[y][x];
}
static void
get_pixel_16L(Imaging im, int x, int y, void* color)
{
UINT8* in = (UINT8*) &im->image[y][x+x];
#ifdef WORDS_BIGENDIAN
UINT16 out = in[0] + (in[1]<<8);
memcpy(color, &out, sizeof(out));
#else
memcpy(color, in, sizeof(UINT16));
#endif
}
static void
get_pixel_16B(Imaging im, int x, int y, void* color)
{
UINT8* in = (UINT8*) &im->image[y][x+x];
#ifdef WORDS_BIGENDIAN
memcpy(color, in, sizeof(UINT16));
#else
UINT16 out = in[1] + (in[0]<<8);
memcpy(color, &out, sizeof(out));
#endif
}
static void
get_pixel_32(Imaging im, int x, int y, void* color)
{
memcpy(color, &im->image32[y][x], sizeof(INT32));
}
static void
get_pixel_32L(Imaging im, int x, int y, void* color)
{
UINT8* in = (UINT8*) &im->image[y][x*4];
#ifdef WORDS_BIGENDIAN
INT32 out = in[0] + (in[1]<<8) + (in[2]<<16) + (in[3]<<24);
memcpy(color, &out, sizeof(out));
#else
memcpy(color, in, sizeof(INT32));
#endif
}
static void
get_pixel_32B(Imaging im, int x, int y, void* color)
{
UINT8* in = (UINT8*) &im->image[y][x*4];
#ifdef WORDS_BIGENDIAN
memcpy(color, in, sizeof(INT32));
#else
INT32 out = in[3] + (in[2]<<8) + (in[1]<<16) + (in[0]<<24);
memcpy(color, &out, sizeof(out));
#endif
}
/* store individual pixel */
static void
put_pixel(Imaging im, int x, int y, const void* color)
{
if (im->image8)
im->image8[y][x] = *((UINT8*) color);
else
memcpy(&im->image32[y][x], color, sizeof(INT32));
}
static void
put_pixel_8(Imaging im, int x, int y, const void* color)
{
im->image8[y][x] = *((UINT8*) color);
}
static void
put_pixel_16L(Imaging im, int x, int y, const void* color)
{
memcpy(&im->image8[y][x+x], color, 2);
}
static void
put_pixel_16B(Imaging im, int x, int y, const void* color)
{
const char* in = color;
UINT8* out = (UINT8*) &im->image8[y][x+x];
out[0] = in[1];
out[1] = in[0];
}
static void
put_pixel_32L(Imaging im, int x, int y, const void* color)
{
memcpy(&im->image8[y][x*4], color, 4);
}
static void
put_pixel_32B(Imaging im, int x, int y, const void* color)
{
const char* in = color;
UINT8* out = (UINT8*) &im->image8[y][x*4];
out[0] = in[3];
out[1] = in[2];
out[2] = in[1];
out[3] = in[0];
}
static void
put_pixel_32(Imaging im, int x, int y, const void* color)
{
memcpy(&im->image32[y][x], color, sizeof(INT32));
}
void
ImagingAccessInit()
{
#define ADD(mode_, line_, get_pixel_, put_pixel_) \
{ ImagingAccess access = add_item(mode_); \
access->line = line_; \
access->get_pixel = get_pixel_; \
access->put_pixel = put_pixel_; \
}
/* populate access table */
ADD("1", line_8, get_pixel_8, put_pixel_8);
ADD("L", line_8, get_pixel_8, put_pixel_8);
ADD("LA", line_32, get_pixel, put_pixel);
ADD("La", line_32, get_pixel, put_pixel);
ADD("I", line_32, get_pixel_32, put_pixel_32);
ADD("I;16", line_16, get_pixel_16L, put_pixel_16L);
ADD("I;16L", line_16, get_pixel_16L, put_pixel_16L);
ADD("I;16B", line_16, get_pixel_16B, put_pixel_16B);
ADD("I;32L", line_32, get_pixel_32L, put_pixel_32L);
ADD("I;32B", line_32, get_pixel_32B, put_pixel_32B);
ADD("F", line_32, get_pixel_32, put_pixel_32);
ADD("P", line_8, get_pixel_8, put_pixel_8);
ADD("PA", line_32, get_pixel, put_pixel);
ADD("RGB", line_32, get_pixel_32, put_pixel_32);
ADD("RGBA", line_32, get_pixel_32, put_pixel_32);
ADD("RGBa", line_32, get_pixel_32, put_pixel_32);
ADD("RGBX", line_32, get_pixel_32, put_pixel_32);
ADD("CMYK", line_32, get_pixel_32, put_pixel_32);
ADD("YCbCr", line_32, get_pixel_32, put_pixel_32);
ADD("LAB", line_32, get_pixel_32, put_pixel_32);
ADD("HSV", line_32, get_pixel_32, put_pixel_32);
}
ImagingAccess
ImagingAccessNew(Imaging im)
{
ImagingAccess access = &access_table[hash(im->mode)];
if (im->mode[0] != access->mode[0] || strcmp(im->mode, access->mode) != 0)
return NULL;
return access;
}
void
_ImagingAccessDelete(Imaging im, ImagingAccess access)
{
}
|
