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| Rev | Author | Line No. | Line |
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| 5131 | clevermous | 1 | /* |
| 2 | IMGLIB: An example image loading library for use with SDL |
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| 3 | Copyright (C) 1999 Sam Lantinga |
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| 4 | |||
| 5 | This library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Library General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2 of the License, or (at your option) any later version. |
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| 9 | |||
| 10 | This library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Library General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU Library General Public |
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| 16 | License along with this library; if not, write to the Free |
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| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 18 | |||
| 19 | Sam Lantinga |
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| 20 | 5635-34 Springhouse Dr. |
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| 21 | Pleasanton, CA 94588 (USA) |
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| 22 | slouken@devolution.com |
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| 23 | */ |
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| 24 | |||
| 25 | /* A simple library to load images of various formats as SDL surfaces */ |
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| 26 | |||
| 27 | #include |
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| 28 | #include |
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| 29 | #include |
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| 30 | |||
| 31 | #include "SDL_image.h" |
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| 32 | |||
| 33 | #define ARRAYSIZE(a) (sizeof(a) / sizeof((a)[0])) |
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| 34 | |||
| 35 | /* Table of image detection and loading functions */ |
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| 36 | static struct { |
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| 37 | char *type; |
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| 38 | int (*is)(SDL_RWops *src); |
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| 39 | SDL_Surface *(*load)(SDL_RWops *src); |
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| 40 | } supported[] = { |
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| 41 | /* keep magicless formats first */ |
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| 42 | { "TGA", 0, IMG_LoadTGA_RW }, |
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| 43 | { "BMP", IMG_isBMP, IMG_LoadBMP_RW }, |
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| 44 | { "PNM", IMG_isPNM, IMG_LoadPNM_RW }, /* P[BGP]M share code */ |
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| 45 | { "XPM", IMG_isXPM, IMG_LoadXPM_RW }, |
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| 46 | { "XCF", IMG_isXCF, IMG_LoadXCF_RW }, |
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| 47 | { "PCX", IMG_isPCX, IMG_LoadPCX_RW }, |
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| 48 | { "GIF", IMG_isGIF, IMG_LoadGIF_RW }, |
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| 49 | { "JPG", IMG_isJPG, IMG_LoadJPG_RW }, |
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| 50 | { "TIF", IMG_isTIF, IMG_LoadTIF_RW }, |
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| 51 | { "PNG", IMG_isPNG, IMG_LoadPNG_RW } |
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| 52 | }; |
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| 53 | |||
| 54 | /* Load an image from a file */ |
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| 55 | SDL_Surface *IMG_Load(const char *file) |
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| 56 | { |
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| 57 | SDL_RWops *src = SDL_RWFromFile(file, "rb"); |
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| 58 | char *ext = strrchr(file, '.'); |
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| 59 | if(ext) |
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| 60 | ext++; |
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| 61 | return IMG_LoadTyped_RW(src, 1, ext); |
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| 62 | } |
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| 63 | |||
| 64 | /* Load an image from an SDL datasource (for compatibility) */ |
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| 65 | SDL_Surface *IMG_Load_RW(SDL_RWops *src, int freesrc) |
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| 66 | { |
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| 67 | return IMG_LoadTyped_RW(src, freesrc, NULL); |
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| 68 | } |
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| 69 | |||
| 70 | /* Portable case-insensitive string compare function */ |
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| 71 | int IMG_string_equals(const char *str1, const char *str2) |
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| 72 | { |
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| 73 | while ( *str1 && *str2 ) { |
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| 74 | if ( toupper((unsigned char)*str1) != |
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| 75 | toupper((unsigned char)*str2) ) |
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| 76 | break; |
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| 77 | ++str1; |
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| 78 | ++str2; |
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| 79 | } |
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| 80 | return (!*str1 && !*str2); |
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| 81 | } |
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| 82 | |||
| 83 | /* Load an image from an SDL datasource, optionally specifying the type */ |
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| 84 | SDL_Surface *IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, char *type) |
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| 85 | { |
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| 86 | int i, start; |
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| 87 | SDL_Surface *image; |
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| 88 | |||
| 89 | /* Make sure there is something to do.. */ |
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| 90 | if ( src == NULL ) { |
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| 91 | return(NULL); |
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| 92 | } |
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| 93 | |||
| 94 | /* See whether or not this data source can handle seeking */ |
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| 95 | if ( SDL_RWseek(src, 0, SEEK_CUR) < 0 ) { |
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| 96 | IMG_SetError("Can't seek in this data source"); |
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| 97 | return(NULL); |
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| 98 | } |
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| 99 | |||
| 100 | /* Detect the type of image being loaded */ |
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| 101 | start = SDL_RWtell(src); |
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| 102 | image = NULL; |
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| 103 | for ( i=0; i < ARRAYSIZE(supported); ++i ) { |
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| 104 | if( (supported[i].is |
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| 105 | && (SDL_RWseek(src, start, SEEK_SET), |
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| 106 | supported[i].is(src))) |
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| 107 | || (type && IMG_string_equals(type, supported[i].type))) { |
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| 108 | #ifdef DEBUG_IMGLIB |
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| 109 | SDL_printf("IMGLIB: Loading image as %s\n", |
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| 110 | supported[i].type); |
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| 111 | #endif |
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| 112 | SDL_RWseek(src, start, SEEK_SET); |
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| 113 | image = supported[i].load(src); |
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| 114 | break; |
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| 115 | } |
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| 116 | } |
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| 117 | |||
| 118 | /* Clean up, check for errors, and return */ |
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| 119 | if ( freesrc ) { |
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| 120 | SDL_RWclose(src); |
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| 121 | } |
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| 122 | if ( i == ARRAYSIZE(supported) ) { |
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| 123 | IMG_SetError("Unsupported image format"); |
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| 124 | } |
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| 125 | return(image); |
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| 126 | } |
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| 127 | |||
| 128 | /* Invert the alpha of a surface for use with OpenGL |
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| 129 | This function is a no-op and only kept for backwards compatibility. |
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| 130 | */ |
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| 131 | int IMG_InvertAlpha(int on) |
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| 132 | { |
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| 133 | return 1; |
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| 134 | } |