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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <types.h> |
29 | #include <types.h> |
30 | #include <errno.h> |
30 | #include <errno.h> |
31 | 31 | ||
32 | #include "ppm.h" |
32 | #include "ppm.h" |
33 | 33 | ||
34 | static void skip_whitespace(unsigned char **data) |
34 | static void skip_whitespace(unsigned char **data) |
35 | { |
35 | { |
36 | retry: |
36 | retry: |
37 | while (**data == ' ' || **data == '\t' || **data == '\n' || **data == '\r') |
37 | while (**data == ' ' || **data == '\t' || **data == '\n' || **data == '\r') |
38 | (*data)++; |
38 | (*data)++; |
39 | if (**data == '#') { |
39 | if (**data == '#') { |
40 | while (1) { |
40 | while (1) { |
41 | if (**data == '\n' || **data == '\r') |
41 | if (**data == '\n' || **data == '\r') |
42 | break; |
42 | break; |
43 | (*data)++; |
43 | (*data)++; |
44 | } |
44 | } |
45 | goto retry; |
45 | goto retry; |
46 | } |
46 | } |
47 | } |
47 | } |
48 | 48 | ||
49 | static void read_num(unsigned char **data, unsigned int *num) |
49 | static void read_num(unsigned char **data, unsigned int *num) |
50 | { |
50 | { |
51 | *num = 0; |
51 | *num = 0; |
52 | while (**data >= '0' && **data <= '9') { |
52 | while (**data >= '0' && **data <= '9') { |
53 | *num *= 10; |
53 | *num *= 10; |
54 | *num += **data - '0'; |
54 | *num += **data - '0'; |
55 | (*data)++; |
55 | (*data)++; |
56 | } |
56 | } |
57 | } |
57 | } |
58 | 58 | ||
- | 59 | int ppm_get_data(unsigned char *data, size_t dtsz, int *width, int *height) |
|
- | 60 | { |
|
- | 61 | /* Read magic */ |
|
- | 62 | if (data[0] != 'P' || data[1] != '6') |
|
- | 63 | return EINVAL; |
|
- | 64 | ||
- | 65 | data+=2; |
|
- | 66 | skip_whitespace(&data); |
|
- | 67 | read_num(&data, width); |
|
- | 68 | skip_whitespace(&data); |
|
- | 69 | read_num(&data,height); |
|
- | 70 | ||
- | 71 | return 0; |
|
- | 72 | } |
|
- | 73 | ||
59 | /** Draw PPM pixmap |
74 | /** Draw PPM pixmap |
60 | * |
75 | * |
61 | * @param data Pointer to PPM data |
76 | * @param data Pointer to PPM data |
62 | * @param datasz Maximum data size |
77 | * @param datasz Maximum data size |
63 | * @param x Coordinate of upper left corner |
78 | * @param x Coordinate of upper left corner |
64 | * @param y Coordinate of upper left corner |
79 | * @param y Coordinate of upper left corner |
65 | * @param maxwidth Maximum allowed width for picture |
80 | * @param maxwidth Maximum allowed width for picture |
66 | * @param maxheight Maximum allowed height for picture |
81 | * @param maxheight Maximum allowed height for picture |
67 | * @param putpixel Putpixel function used to print bitmap |
82 | * @param putpixel Putpixel function used to print bitmap |
68 | */ |
83 | */ |
69 | int draw_ppm(unsigned char *data, size_t datasz, unsigned int sx, |
84 | int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx, |
70 | unsigned int sy, |
85 | unsigned int sy, |
71 | unsigned int maxwidth, unsigned int maxheight, |
86 | unsigned int maxwidth, unsigned int maxheight, |
72 | void (*putpixel)(int,unsigned int, unsigned int, int),int vp) |
87 | void (*putpixel)(int,unsigned int, unsigned int, int),int vp) |
73 | { |
88 | { |
74 | unsigned int width, height; |
89 | unsigned int width, height; |
75 | unsigned int maxcolor; |
90 | unsigned int maxcolor; |
76 | int i; |
91 | int i; |
77 | void *maxdatap = data + datasz; |
92 | void *maxdatap = data + datasz; |
78 | unsigned int color; |
93 | unsigned int color; |
79 | unsigned int coef; |
94 | unsigned int coef; |
80 | 95 | ||
81 | /* Read magic */ |
96 | /* Read magic */ |
82 | if (data[0] != 'P' || data[1] != '6') |
97 | if (data[0] != 'P' || data[1] != '6') |
83 | return EINVAL; |
98 | return EINVAL; |
84 | 99 | ||
85 | data+=2; |
100 | data+=2; |
86 | skip_whitespace(&data); |
101 | skip_whitespace(&data); |
87 | read_num(&data, &width); |
102 | read_num(&data, &width); |
88 | skip_whitespace(&data); |
103 | skip_whitespace(&data); |
89 | read_num(&data,&height); |
104 | read_num(&data,&height); |
90 | skip_whitespace(&data); |
105 | skip_whitespace(&data); |
91 | read_num(&data,&maxcolor); |
106 | read_num(&data,&maxcolor); |
92 | data++; |
107 | data++; |
93 | 108 | ||
94 | if (maxcolor == 0 || maxcolor > 255 || width*height > datasz) { |
109 | if (maxcolor == 0 || maxcolor > 255 || width*height > datasz) { |
95 | return EINVAL; |
110 | return EINVAL; |
96 | } |
111 | } |
97 | coef = 255/maxcolor; |
112 | coef = 255/maxcolor; |
98 | if (coef*maxcolor > 255) |
113 | if (coef*maxcolor > 255) |
99 | coef -= 1; |
114 | coef -= 1; |
100 | 115 | ||
101 | for (i=0; i < width*height; i++) { |
116 | for (i=0; i < width*height; i++) { |
102 | /* Crop picture if we don't fit into region */ |
117 | /* Crop picture if we don't fit into region */ |
103 | if (i % width > maxwidth || i/width > maxheight) { |
118 | if (i % width > maxwidth || i/width > maxheight) { |
104 | data += 3; |
119 | data += 3; |
105 | continue; |
120 | continue; |
106 | } |
121 | } |
107 | color = ((data[0]*coef) << 16) + ((data[1]*coef) << 8) + data[0]*coef; |
122 | color = ((data[0]*coef) << 16) + ((data[1]*coef) << 8) + data[2]*coef; |
108 | 123 | ||
109 | (*putpixel)(vp, sx+(i % width), sy+(i / width), color); |
124 | (*putpixel)(vp, sx+(i % width), sy+(i / width), color); |
110 | data += 3; |
125 | data += 3; |
111 | } |
126 | } |
112 | } |
127 | } |
113 | 128 |