Rev 1555 | Rev 1709 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1547 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2006 Ondrej Palkovsky |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <types.h> |
||
| 30 | #include <errno.h> |
||
| 31 | |||
| 32 | #include "ppm.h" |
||
| 33 | |||
| 34 | static void skip_whitespace(unsigned char **data) |
||
| 35 | { |
||
| 36 | retry: |
||
| 37 | while (**data == ' ' || **data == '\t' || **data == '\n' || **data == '\r') |
||
| 38 | (*data)++; |
||
| 39 | if (**data == '#') { |
||
| 40 | while (1) { |
||
| 41 | if (**data == '\n' || **data == '\r') |
||
| 42 | break; |
||
| 43 | (*data)++; |
||
| 44 | } |
||
| 45 | goto retry; |
||
| 46 | } |
||
| 47 | } |
||
| 48 | |||
| 49 | static void read_num(unsigned char **data, unsigned int *num) |
||
| 50 | { |
||
| 51 | *num = 0; |
||
| 52 | while (**data >= '0' && **data <= '9') { |
||
| 53 | *num *= 10; |
||
| 54 | *num += **data - '0'; |
||
| 55 | (*data)++; |
||
| 56 | } |
||
| 57 | } |
||
| 58 | |||
| 1555 | palkovsky | 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 | |||
| 1547 | palkovsky | 74 | /** Draw PPM pixmap |
| 75 | * |
||
| 76 | * @param data Pointer to PPM data |
||
| 77 | * @param datasz Maximum data size |
||
| 78 | * @param x Coordinate of upper left corner |
||
| 79 | * @param y Coordinate of upper left corner |
||
| 80 | * @param maxwidth Maximum allowed width for picture |
||
| 81 | * @param maxheight Maximum allowed height for picture |
||
| 82 | * @param putpixel Putpixel function used to print bitmap |
||
| 83 | */ |
||
| 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, |
||
| 1673 | palkovsky | 87 | putpixel_cb_t putpixel,void *vport) |
| 1547 | palkovsky | 88 | { |
| 89 | unsigned int width, height; |
||
| 90 | unsigned int maxcolor; |
||
| 91 | int i; |
||
| 92 | void *maxdatap = data + datasz; |
||
| 93 | unsigned int color; |
||
| 94 | unsigned int coef; |
||
| 95 | |||
| 96 | /* Read magic */ |
||
| 97 | if (data[0] != 'P' || data[1] != '6') |
||
| 98 | return EINVAL; |
||
| 99 | |||
| 100 | data+=2; |
||
| 101 | skip_whitespace(&data); |
||
| 102 | read_num(&data, &width); |
||
| 103 | skip_whitespace(&data); |
||
| 104 | read_num(&data,&height); |
||
| 105 | skip_whitespace(&data); |
||
| 106 | read_num(&data,&maxcolor); |
||
| 107 | data++; |
||
| 108 | |||
| 109 | if (maxcolor == 0 || maxcolor > 255 || width*height > datasz) { |
||
| 110 | return EINVAL; |
||
| 111 | } |
||
| 112 | coef = 255/maxcolor; |
||
| 113 | if (coef*maxcolor > 255) |
||
| 114 | coef -= 1; |
||
| 115 | |||
| 116 | for (i=0; i < width*height; i++) { |
||
| 117 | /* Crop picture if we don't fit into region */ |
||
| 118 | if (i % width > maxwidth || i/width > maxheight) { |
||
| 119 | data += 3; |
||
| 120 | continue; |
||
| 121 | } |
||
| 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 | } |
||
| 127 | } |