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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 <sys/types.h> |
29 | #include <sys/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' || |
37 | while (**data == ' ' || **data == '\t' || **data == '\n' || |
38 | **data == '\r') |
38 | **data == '\r') |
39 | (*data)++; |
39 | (*data)++; |
40 | if (**data == '#') { |
40 | if (**data == '#') { |
41 | while (1) { |
41 | while (1) { |
42 | if (**data == '\n' || **data == '\r') |
42 | if (**data == '\n' || **data == '\r') |
43 | break; |
43 | break; |
44 | (*data)++; |
44 | (*data)++; |
45 | } |
45 | } |
46 | goto retry; |
46 | goto retry; |
47 | } |
47 | } |
48 | } |
48 | } |
49 | 49 | ||
50 | static void read_num(unsigned char **data, unsigned int *num) |
50 | static void read_num(unsigned char **data, unsigned int *num) |
51 | { |
51 | { |
52 | *num = 0; |
52 | *num = 0; |
53 | while (**data >= '0' && **data <= '9') { |
53 | while (**data >= '0' && **data <= '9') { |
54 | *num *= 10; |
54 | *num *= 10; |
55 | *num += **data - '0'; |
55 | *num += **data - '0'; |
56 | (*data)++; |
56 | (*data)++; |
57 | } |
57 | } |
58 | } |
58 | } |
59 | 59 | ||
60 | int ppm_get_data(unsigned char *data, size_t dtsz, unsigned int *width, |
60 | int ppm_get_data(unsigned char *data, size_t dtsz, unsigned int *width, |
61 | unsigned int *height) |
61 | unsigned int *height) |
62 | { |
62 | { |
63 | /* Read magic */ |
63 | /* Read magic */ |
64 | if (data[0] != 'P' || data[1] != '6') |
64 | if (data[0] != 'P' || data[1] != '6') |
65 | return EINVAL; |
65 | return EINVAL; |
66 | 66 | ||
67 | data+=2; |
67 | data+=2; |
68 | skip_whitespace(&data); |
68 | skip_whitespace(&data); |
69 | read_num(&data, width); |
69 | read_num(&data, width); |
70 | skip_whitespace(&data); |
70 | skip_whitespace(&data); |
71 | read_num(&data,height); |
71 | read_num(&data,height); |
72 | 72 | ||
73 | return 0; |
73 | return 0; |
74 | } |
74 | } |
75 | 75 | ||
76 | /** Draw PPM pixmap |
76 | /** Draw PPM pixmap |
77 | * |
77 | * |
78 | * @param data Pointer to PPM data |
78 | * @param data Pointer to PPM data |
79 | * @param datasz Maximum data size |
79 | * @param datasz Maximum data size |
80 | * @param sx Coordinate of upper left corner |
80 | * @param sx Coordinate of upper left corner |
81 | * @param sy Coordinate of upper left corner |
81 | * @param sy Coordinate of upper left corner |
82 | * @param maxwidth Maximum allowed width for picture |
82 | * @param maxwidth Maximum allowed width for picture |
83 | * @param maxheight Maximum allowed height for picture |
83 | * @param maxheight Maximum allowed height for picture |
84 | * @param putpixel Putpixel function used to print bitmap |
84 | * @param putpixel Putpixel function used to print bitmap |
85 | */ |
85 | */ |
86 | int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx, |
86 | int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx, |
87 | unsigned int sy, unsigned int maxwidth, unsigned int maxheight, |
87 | unsigned int sy, unsigned int maxwidth, unsigned int maxheight, |
88 | putpixel_cb_t putpixel, void *vport) |
88 | putpixel_cb_t putpixel, void *vport) |
89 | { |
89 | { |
90 | unsigned int width, height; |
90 | unsigned int width, height; |
91 | unsigned int maxcolor; |
91 | unsigned int maxcolor; |
92 | unsigned int i; |
92 | unsigned int i; |
93 | unsigned int color; |
93 | unsigned int color; |
94 | unsigned int coef; |
94 | unsigned int coef; |
95 | 95 | ||
96 | /* Read magic */ |
96 | /* Read magic */ |
97 | if ((data[0] != 'P') || (data[1] != '6')) |
97 | if ((data[0] != 'P') || (data[1] != '6')) |
98 | return EINVAL; |
98 | return EINVAL; |
99 | 99 | ||
100 | data += 2; |
100 | data += 2; |
101 | skip_whitespace(&data); |
101 | skip_whitespace(&data); |
102 | read_num(&data, &width); |
102 | read_num(&data, &width); |
103 | skip_whitespace(&data); |
103 | skip_whitespace(&data); |
104 | read_num(&data, &height); |
104 | read_num(&data, &height); |
105 | skip_whitespace(&data); |
105 | skip_whitespace(&data); |
106 | read_num(&data, &maxcolor); |
106 | read_num(&data, &maxcolor); |
107 | data++; |
107 | data++; |
108 | 108 | ||
109 | if ((maxcolor == 0) || (maxcolor > 255) || (width * height > datasz)) |
109 | if ((maxcolor == 0) || (maxcolor > 255) || (width * height > datasz)) |
110 | return EINVAL; |
110 | return EINVAL; |
111 | 111 | ||
112 | coef = 255 / maxcolor; |
112 | coef = 255 / maxcolor; |
113 | if (coef * maxcolor > 255) |
113 | if (coef * maxcolor > 255) |
114 | coef -= 1; |
114 | coef -= 1; |
115 | 115 | ||
116 | for (i = 0; i < width * height; i++) { |
116 | for (i = 0; i < width * height; i++) { |
117 | /* Crop picture if we don't fit into region */ |
117 | /* Crop picture if we don't fit into region */ |
118 | if (i % width > maxwidth || i / width > maxheight) { |
118 | if (i % width > maxwidth || i / width > maxheight) { |
119 | data += 3; |
119 | data += 3; |
120 | continue; |
120 | continue; |
121 | } |
121 | } |
122 | color = ((data[0] * coef) << 16) + ((data[1] * coef) << 8) + |
122 | color = ((data[0] * coef) << 16) + ((data[1] * coef) << 8) + |
123 | data[2] * coef; |
123 | data[2] * coef; |
124 | 124 | ||
125 | (*putpixel)(vport, sx + (i % width), sy + (i / width), color); |
125 | (*putpixel)(vport, sx + (i % width), sy + (i / width), color); |
126 | data += 3; |
126 | data += 3; |
127 | } |
127 | } |
128 | 128 | ||
129 | return 0; |
129 | return 0; |
130 | } |
130 | } |
131 | 131 |