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Rev | Author | Line No. | Line |
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1547 | palkovsky | 1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
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3 | * All rights reserved. |
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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 | |||
29 | #include <types.h> |
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30 | #include <errno.h> |
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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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37 | while (**data == ' ' || **data == '\t' || **data == '\n' || **data == '\r') |
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38 | (*data)++; |
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39 | if (**data == '#') { |
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40 | while (1) { |
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41 | if (**data == '\n' || **data == '\r') |
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42 | break; |
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43 | (*data)++; |
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44 | } |
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45 | goto retry; |
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46 | } |
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47 | } |
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48 | |||
49 | static void read_num(unsigned char **data, unsigned int *num) |
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50 | { |
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51 | *num = 0; |
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52 | while (**data >= '0' && **data <= '9') { |
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53 | *num *= 10; |
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54 | *num += **data - '0'; |
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55 | (*data)++; |
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56 | } |
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57 | } |
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58 | |||
1555 | palkovsky | 59 | int ppm_get_data(unsigned char *data, size_t dtsz, int *width, int *height) |
60 | { |
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61 | /* Read magic */ |
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62 | if (data[0] != 'P' || data[1] != '6') |
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63 | return EINVAL; |
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64 | |||
65 | data+=2; |
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66 | skip_whitespace(&data); |
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67 | read_num(&data, width); |
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68 | skip_whitespace(&data); |
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69 | read_num(&data,height); |
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70 | |||
71 | return 0; |
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72 | } |
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73 | |||
1547 | palkovsky | 74 | /** Draw PPM pixmap |
75 | * |
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76 | * @param data Pointer to PPM data |
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77 | * @param datasz Maximum data size |
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1709 | jermar | 78 | * @param sx Coordinate of upper left corner |
79 | * @param sy Coordinate of upper left corner |
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1547 | palkovsky | 80 | * @param maxwidth Maximum allowed width for picture |
81 | * @param maxheight Maximum allowed height for picture |
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82 | * @param putpixel Putpixel function used to print bitmap |
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83 | */ |
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1555 | palkovsky | 84 | int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx, |
1547 | palkovsky | 85 | unsigned int sy, |
86 | unsigned int maxwidth, unsigned int maxheight, |
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1709 | jermar | 87 | putpixel_cb_t putpixel, void *vport) |
1547 | palkovsky | 88 | { |
89 | unsigned int width, height; |
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90 | unsigned int maxcolor; |
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91 | int i; |
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92 | void *maxdatap = data + datasz; |
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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 | |||
109 | if (maxcolor == 0 || maxcolor > 255 || width*height > datasz) { |
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110 | return EINVAL; |
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111 | } |
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112 | coef = 255/maxcolor; |
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113 | if (coef*maxcolor > 255) |
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114 | coef -= 1; |
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115 | |||
116 | for (i=0; i < width*height; i++) { |
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117 | /* Crop picture if we don't fit into region */ |
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118 | if (i % width > maxwidth || i/width > maxheight) { |
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119 | data += 3; |
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120 | continue; |
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121 | } |
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1555 | palkovsky | 122 | color = ((data[0]*coef) << 16) + ((data[1]*coef) << 8) + data[2]*coef; |
1547 | palkovsky | 123 | |
1673 | palkovsky | 124 | (*putpixel)(vport, sx+(i % width), sy+(i / width), color); |
1547 | palkovsky | 125 | data += 3; |
126 | } |
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127 | } |