File: IMG_tif.c

package info (click to toggle)
libsdl2-image 2.0.5+dfsg1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 2,048 kB
  • sloc: ansic: 13,795; sh: 10,561; makefile: 91
file content (241 lines) | stat: -rw-r--r-- 6,586 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
  SDL_image:  An example image loading library for use with SDL
  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#if !(defined(__APPLE__) || defined(SDL_IMAGE_USE_WIC_BACKEND)) || defined(SDL_IMAGE_USE_COMMON_BACKEND)

/* This is a TIFF image file loading framework */

#include "SDL_image.h"

#ifdef LOAD_TIF

#include <tiffio.h>

static struct {
    int loaded;
    void *handle;
    TIFF* (*TIFFClientOpen)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc);
    void (*TIFFClose)(TIFF*);
    int (*TIFFGetField)(TIFF*, ttag_t, ...);
    int (*TIFFReadRGBAImageOriented)(TIFF*, uint32, uint32, uint32*, int, int);
    TIFFErrorHandler (*TIFFSetErrorHandler)(TIFFErrorHandler);
} lib;

#ifdef LOAD_TIF_DYNAMIC
#define FUNCTION_LOADER(FUNC, SIG) \
    lib.FUNC = (SIG) SDL_LoadFunction(lib.handle, #FUNC); \
    if (lib.FUNC == NULL) { SDL_UnloadObject(lib.handle); return -1; }
#else
#define FUNCTION_LOADER(FUNC, SIG) \
    lib.FUNC = FUNC;
#endif

int IMG_InitTIF()
{
    if ( lib.loaded == 0 ) {
#ifdef LOAD_TIF_DYNAMIC
        lib.handle = SDL_LoadObject(LOAD_TIF_DYNAMIC);
        if ( lib.handle == NULL ) {
            return -1;
        }
#endif
        FUNCTION_LOADER(TIFFClientOpen, TIFF * (*)(const char*, const char*, thandle_t, TIFFReadWriteProc, TIFFReadWriteProc, TIFFSeekProc, TIFFCloseProc, TIFFSizeProc, TIFFMapFileProc, TIFFUnmapFileProc))
        FUNCTION_LOADER(TIFFClose, void (*)(TIFF*))
        FUNCTION_LOADER(TIFFGetField, int (*)(TIFF*, ttag_t, ...))
        FUNCTION_LOADER(TIFFReadRGBAImageOriented, int (*)(TIFF*, uint32, uint32, uint32*, int, int))
        FUNCTION_LOADER(TIFFSetErrorHandler, TIFFErrorHandler (*)(TIFFErrorHandler))
    }
    ++lib.loaded;

    return 0;
}
void IMG_QuitTIF()
{
    if ( lib.loaded == 0 ) {
        return;
    }
    if ( lib.loaded == 1 ) {
#ifdef LOAD_TIF_DYNAMIC
        SDL_UnloadObject(lib.handle);
#endif
    }
    --lib.loaded;
}

/*
 * These are the thunking routine to use the SDL_RWops* routines from
 * libtiff's internals.
*/

static tsize_t tiff_read(thandle_t fd, tdata_t buf, tsize_t size)
{
    return (tsize_t)SDL_RWread((SDL_RWops*)fd, buf, 1, size);
}

static toff_t tiff_seek(thandle_t fd, toff_t offset, int origin)
{
    return SDL_RWseek((SDL_RWops*)fd, offset, origin);
}

static tsize_t tiff_write(thandle_t fd, tdata_t buf, tsize_t size)
{
    return (tsize_t)SDL_RWwrite((SDL_RWops*)fd, buf, 1, size);
}

static int tiff_close(thandle_t fd)
{
    /*
     * We don't want libtiff closing our SDL_RWops*, but if it's not given
         * a routine to try, and if the image isn't a TIFF, it'll segfault.
     */
    return 0;
}

static int tiff_map(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
    return (0);
}

static void tiff_unmap(thandle_t fd, tdata_t base, toff_t size)
{
    return;
}

static toff_t tiff_size(thandle_t fd)
{
    Sint64 save_pos;
    toff_t size;

    save_pos = SDL_RWtell((SDL_RWops*)fd);
    SDL_RWseek((SDL_RWops*)fd, 0, RW_SEEK_END);
    size = SDL_RWtell((SDL_RWops*)fd);
    SDL_RWseek((SDL_RWops*)fd, save_pos, RW_SEEK_SET);
    return size;
}

int IMG_isTIF(SDL_RWops* src)
{
    Sint64 start;
    int is_TIF;
    Uint8 magic[4];

    if ( !src )
        return 0;
    start = SDL_RWtell(src);
    is_TIF = 0;
    if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) {
        if ( (magic[0] == 'I' &&
                      magic[1] == 'I' &&
              magic[2] == 0x2a &&
                      magic[3] == 0x00) ||
             (magic[0] == 'M' &&
                      magic[1] == 'M' &&
              magic[2] == 0x00 &&
                      magic[3] == 0x2a) ) {
            is_TIF = 1;
        }
    }
    SDL_RWseek(src, start, RW_SEEK_SET);
    return(is_TIF);
}

SDL_Surface* IMG_LoadTIF_RW(SDL_RWops* src)
{
    Sint64 start;
    TIFF* tiff = NULL;
    SDL_Surface* surface = NULL;
    Uint32 img_width, img_height;
    Uint32 Rmask, Gmask, Bmask, Amask;

    if ( !src ) {
        /* The error message has been set in SDL_RWFromFile */
        return NULL;
    }
    start = SDL_RWtell(src);

    if ( (IMG_Init(IMG_INIT_TIF) & IMG_INIT_TIF) == 0 ) {
        return NULL;
    }

    /* turn off memory mapped access with the m flag */
    tiff = lib.TIFFClientOpen("SDL_image", "rm", (thandle_t)src,
        tiff_read, tiff_write, tiff_seek, tiff_close, tiff_size, tiff_map, tiff_unmap);
    if(!tiff)
        goto error;

    /* Retrieve the dimensions of the image from the TIFF tags */
    lib.TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &img_width);
    lib.TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &img_height);

    Rmask = 0x000000FF;
    Gmask = 0x0000FF00;
    Bmask = 0x00FF0000;
    Amask = 0xFF000000;
    surface = SDL_CreateRGBSurface(SDL_SWSURFACE, img_width, img_height, 32,
        Rmask, Gmask, Bmask, Amask);
    if(!surface)
        goto error;

    if(!lib.TIFFReadRGBAImageOriented(tiff, img_width, img_height, (uint32 *)surface->pixels, ORIENTATION_TOPLEFT, 0))
        goto error;

    lib.TIFFClose(tiff);

    return surface;

error:
    SDL_RWseek(src, start, RW_SEEK_SET);
    if (surface) {
        SDL_FreeSurface(surface);
    }
    if (tiff) {
        lib.TIFFClose(tiff);
    }
    return NULL;
}

#else

int IMG_InitTIF()
{
    IMG_SetError("TIFF images are not supported");
    return(-1);
}

void IMG_QuitTIF()
{
}

/* See if an image is contained in a data source */
int IMG_isTIF(SDL_RWops *src)
{
    return(0);
}

/* Load a TIFF type image from an SDL datasource */
SDL_Surface *IMG_LoadTIF_RW(SDL_RWops *src)
{
    return(NULL);
}

#endif /* LOAD_TIF */

#endif /* !defined(__APPLE__) || defined(SDL_IMAGE_USE_COMMON_BACKEND) */