blob: f13803cb688d26ec0591b02c7f6c2c0556ab67ee (
plain) (
blame)
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
|
/*
* The Python Imaging Library.
* $Id$
*
* decoder for uncompressed PCD image data.
*
* history:
* 96-05-10 fl Created
* 96-05-18 fl New tables
* 97-01-25 fl Use PhotoYCC unpacker
*
* notes:
* This driver supports uncompressed PCD modes only
* (resolutions up to 768x512).
*
* Copyright (c) Fredrik Lundh 1996-97.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
int
ImagingPcdDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t bytes) {
int x;
int chunk;
UINT8 *out;
UINT8 *ptr;
ptr = buf;
chunk = 3 * state->xsize;
for (;;) {
/* We need data for two full lines before we can do anything */
if (bytes < chunk) {
return ptr - buf;
}
/* Unpack first line */
out = state->buffer;
for (x = 0; x < state->xsize; x++) {
out[0] = ptr[x];
out[1] = ptr[(x + 4 * state->xsize) / 2];
out[2] = ptr[(x + 5 * state->xsize) / 2];
out += 3;
}
state->shuffle((UINT8 *)im->image[state->y], state->buffer, state->xsize);
if (++state->y >= state->ysize) {
return -1; /* This can hardly happen */
}
/* Unpack second line */
out = state->buffer;
for (x = 0; x < state->xsize; x++) {
out[0] = ptr[x + state->xsize];
out[1] = ptr[(x + 4 * state->xsize) / 2];
out[2] = ptr[(x + 5 * state->xsize) / 2];
out += 3;
}
state->shuffle((UINT8 *)im->image[state->y], state->buffer, state->xsize);
if (++state->y >= state->ysize) {
return -1;
}
ptr += chunk;
bytes -= chunk;
}
}
|
