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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 | |||
24 | 5/29/2000: TIFF loader written. Mark Baker (mbaker@0x7a69.net) |
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25 | 2000-07-28: Fixed two off-by one bugs in reversal loop and made it work on |
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26 | big-endian machines (Mattias) |
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27 | 2000-08-09: Removed alpha inversion (Mattias) |
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28 | */ |
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29 | |||
30 | |||
31 | |||
32 | /* This is a TIFF image file loading framework */ |
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33 | |||
34 | #include |
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35 | |||
36 | #include "SDL_image.h" |
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37 | |||
38 | #ifdef LOAD_TIF |
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39 | |||
40 | #include |
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41 | |||
42 | /* |
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43 | * These are the thunking routine to use the SDL_RWops* routines from |
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44 | * libtiff's internals. |
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45 | */ |
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46 | |||
47 | static tsize_t tiff_read(thandle_t fd, tdata_t buf, tsize_t size) |
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48 | { |
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49 | return SDL_RWread((SDL_RWops*)fd, buf, 1, size); |
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50 | } |
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51 | |||
52 | static toff_t tiff_seek(thandle_t fd, toff_t offset, int origin) |
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53 | { |
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54 | return SDL_RWseek((SDL_RWops*)fd, offset, origin); |
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55 | } |
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56 | |||
57 | static tsize_t tiff_write(thandle_t fd, tdata_t buf, tsize_t size) |
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58 | { |
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59 | return SDL_RWwrite((SDL_RWops*)fd, buf, 1, size); |
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60 | } |
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61 | |||
62 | static int tiff_close(thandle_t fd) |
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63 | { |
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64 | /* |
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65 | * We don't want libtiff closing our SDL_RWops*, but if it's not given |
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66 | * a routine to try, and if the image isn't a TIFF, it'll segfault. |
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67 | */ |
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68 | return 0; |
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69 | } |
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70 | |||
71 | static toff_t tiff_size(thandle_t fd) |
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72 | { |
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73 | Uint32 save_pos; |
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74 | toff_t size; |
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75 | |||
76 | save_pos = SDL_RWtell((SDL_RWops*)fd); |
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77 | SDL_RWseek((SDL_RWops*)fd, 0, SEEK_END); |
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78 | size = SDL_RWtell((SDL_RWops*)fd); |
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79 | SDL_RWseek((SDL_RWops*)fd, save_pos, SEEK_SET); |
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80 | return size; |
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81 | } |
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82 | |||
83 | int IMG_isTIF(SDL_RWops* src) |
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84 | { |
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85 | TIFF* tiff; |
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86 | TIFFErrorHandler prev_handler; |
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87 | |||
88 | /* Suppress output from libtiff */ |
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89 | prev_handler = TIFFSetErrorHandler(NULL); |
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90 | |||
91 | /* Attempt to process the given file data */ |
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92 | /* turn off memory mapped access with the m flag */ |
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93 | tiff = TIFFClientOpen("SDL_image", "rm", (thandle_t)src, |
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94 | tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, NULL, NULL); |
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95 | |||
96 | /* Reset the default error handler, since it can be useful for info */ |
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97 | TIFFSetErrorHandler(prev_handler); |
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98 | |||
99 | /* If it's not a TIFF, then tiff will be NULL. */ |
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100 | if(!tiff) |
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101 | return 0; |
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102 | |||
103 | /* Free up any dynamically allocated memory libtiff uses */ |
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104 | TIFFClose(tiff); |
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105 | |||
106 | return 1; |
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107 | } |
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108 | |||
109 | SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src) |
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110 | { |
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111 | TIFF* tiff; |
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112 | SDL_Surface* surface = NULL; |
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113 | Uint32 img_width, img_height; |
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114 | Uint32 Rmask, Gmask, Bmask, Amask, mask; |
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115 | Uint32 x, y; |
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116 | Uint32 half; |
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117 | |||
118 | |||
119 | /* turn off memory mapped access with the m flag */ |
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120 | tiff = TIFFClientOpen("SDL_image", "rm", (thandle_t)src, |
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121 | tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, NULL, NULL); |
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122 | if(!tiff) |
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123 | return NULL; |
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124 | |||
125 | /* Retrieve the dimensions of the image from the TIFF tags */ |
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126 | TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width); |
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127 | TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height); |
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128 | |||
129 | Rmask = 0x000000FF; |
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130 | Gmask = 0x0000FF00; |
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131 | Bmask = 0x00FF0000; |
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132 | Amask = 0xFF000000; |
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133 | surface = SDL_AllocSurface(SDL_SWSURFACE, img_width, img_height, 32, |
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134 | Rmask, Gmask, Bmask, Amask); |
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135 | if(!surface) |
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136 | return NULL; |
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137 | |||
138 | if(!TIFFReadRGBAImage(tiff, img_width, img_height, surface->pixels, 0)) |
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139 | return NULL; |
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140 | |||
141 | /* libtiff loads the image upside-down, flip it back */ |
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142 | half = img_height / 2; |
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143 | for(y = 0; y < half; y++) |
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144 | { |
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145 | Uint32 *top = (Uint32 *)surface->pixels + y * surface->pitch/4; |
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146 | Uint32 *bot = (Uint32 *)surface->pixels |
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147 | + (img_height - y - 1) * surface->pitch/4; |
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148 | for(x = 0; x < img_width; x++) |
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149 | { |
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150 | Uint32 tmp = top[x]; |
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151 | top[x] = bot[x]; |
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152 | bot[x] = tmp; |
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153 | } |
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154 | } |
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155 | TIFFClose(tiff); |
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156 | |||
157 | return surface; |
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158 | } |
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159 | |||
160 | #else |
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161 | |||
162 | /* See if an image is contained in a data source */ |
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163 | int IMG_isTIF(SDL_RWops *src) |
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164 | { |
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165 | return(0); |
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166 | } |
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167 | |||
168 | /* Load a TIFF type image from an SDL datasource */ |
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169 | SDL_Surface *IMG_LoadTIF_RW(SDL_RWops *src) |
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170 | { |
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171 | return(NULL); |
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172 | } |
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173 | |||
174 | #endif /* LOAD_TIF */>> |