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| Rev | Author | Line No. | Line |
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| 1547 | palkovsky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Ondrej Palkovsky |
| 1547 | palkovsky | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 2541 | jermar | 29 | #include <sys/types.h> |
| 1547 | palkovsky | 30 | #include <errno.h> |
| 31 | |||
| 32 | #include "ppm.h" |
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| 33 | |||
| 34 | static void skip_whitespace(unsigned char **data) |
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| 35 | { |
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| 36 | retry: |
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| 2541 | jermar | 37 | while (**data == ' ' || **data == '\t' || **data == '\n' || |
| 38 | **data == '\r') |
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| 1547 | palkovsky | 39 | (*data)++; |
| 40 | if (**data == '#') { |
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| 41 | while (1) { |
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| 42 | if (**data == '\n' || **data == '\r') |
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| 43 | break; |
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| 44 | (*data)++; |
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| 45 | } |
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| 46 | goto retry; |
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| 47 | } |
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| 48 | } |
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| 49 | |||
| 50 | static void read_num(unsigned char **data, unsigned int *num) |
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| 51 | { |
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| 52 | *num = 0; |
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| 53 | while (**data >= '0' && **data <= '9') { |
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| 54 | *num *= 10; |
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| 55 | *num += **data - '0'; |
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| 56 | (*data)++; |
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| 57 | } |
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| 58 | } |
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| 59 | |||
| 2541 | jermar | 60 | int ppm_get_data(unsigned char *data, size_t dtsz, unsigned int *width, |
| 61 | unsigned int *height) |
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| 1555 | palkovsky | 62 | { |
| 63 | /* Read magic */ |
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| 64 | if (data[0] != 'P' || data[1] != '6') |
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| 65 | return EINVAL; |
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| 66 | |||
| 67 | data+=2; |
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| 68 | skip_whitespace(&data); |
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| 69 | read_num(&data, width); |
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| 70 | skip_whitespace(&data); |
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| 71 | read_num(&data,height); |
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| 72 | |||
| 73 | return 0; |
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| 74 | } |
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| 75 | |||
| 1547 | palkovsky | 76 | /** Draw PPM pixmap |
| 77 | * |
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| 78 | * @param data Pointer to PPM data |
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| 79 | * @param datasz Maximum data size |
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| 1709 | jermar | 80 | * @param sx Coordinate of upper left corner |
| 81 | * @param sy Coordinate of upper left corner |
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| 1547 | palkovsky | 82 | * @param maxwidth Maximum allowed width for picture |
| 83 | * @param maxheight Maximum allowed height for picture |
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| 84 | * @param putpixel Putpixel function used to print bitmap |
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| 85 | */ |
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| 2541 | jermar | 86 | int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx, |
| 87 | unsigned int sy, unsigned int maxwidth, unsigned int maxheight, |
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| 88 | putpixel_cb_t putpixel, void *vport) |
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| 1547 | palkovsky | 89 | { |
| 90 | unsigned int width, height; |
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| 91 | unsigned int maxcolor; |
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| 92 | int i; |
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| 93 | unsigned int color; |
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| 94 | unsigned int coef; |
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| 95 | |||
| 96 | /* Read magic */ |
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| 97 | if (data[0] != 'P' || data[1] != '6') |
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| 98 | return EINVAL; |
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| 99 | |||
| 100 | data+=2; |
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| 101 | skip_whitespace(&data); |
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| 102 | read_num(&data, &width); |
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| 103 | skip_whitespace(&data); |
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| 104 | read_num(&data,&height); |
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| 105 | skip_whitespace(&data); |
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| 106 | read_num(&data,&maxcolor); |
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| 107 | data++; |
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| 108 | |||
| 2541 | jermar | 109 | if (maxcolor == 0 || maxcolor > 255 || width * height > datasz) { |
| 1547 | palkovsky | 110 | return EINVAL; |
| 111 | } |
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| 2541 | jermar | 112 | coef = 255 / maxcolor; |
| 113 | if (coef * maxcolor > 255) |
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| 1547 | palkovsky | 114 | coef -= 1; |
| 115 | |||
| 2541 | jermar | 116 | for (i = 0; i < width * height; i++) { |
| 1547 | palkovsky | 117 | /* Crop picture if we don't fit into region */ |
| 2541 | jermar | 118 | if (i % width > maxwidth || i / width > maxheight) { |
| 1547 | palkovsky | 119 | data += 3; |
| 120 | continue; |
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| 121 | } |
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| 2541 | jermar | 122 | color = ((data[0] * coef) << 16) + ((data[1] * coef) << 8) + |
| 123 | data[2] * coef; |
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| 1547 | palkovsky | 124 | |
| 2541 | jermar | 125 | (*putpixel)(vport, sx + (i % width), sy + (i / width), color); |
| 1547 | palkovsky | 126 | data += 3; |
| 127 | } |
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| 1720 | palkovsky | 128 | |
| 129 | return 0; |
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| 1547 | palkovsky | 130 | } |