source: libcaca/trunk/src/common-image.c @ 4330

Last change on this file since 4330 was 4148, checked in by Sam Hocevar, 10 years ago

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1/*
2 *  Imaging tools for cacaview and img2irc
3 *  Copyright (c) 2003-2006 Sam Hocevar <sam@hocevar.net>
4 *                All Rights Reserved
5 *
6 *  $Id: common-image.c 4148 2009-12-19 14:38:38Z sam $
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15#include "config.h"
16
17#if !defined(__KERNEL__)
18#   include <string.h>
19#   include <stdlib.h>
20#endif
21
22#if defined(USE_IMLIB2)
23#   include <Imlib2.h>
24#endif
25
26#include "caca.h"
27
28#include "common-image.h"
29
30#if !defined(USE_IMLIB2)
31static unsigned int u32fread(caca_file_t *);
32static unsigned int u16fread(caca_file_t *);
33static unsigned int u8fread(caca_file_t *);
34#endif
35
36struct image * load_image(char const * name)
37{
38    struct image * im = malloc(sizeof(struct image));
39    unsigned int depth, bpp, rmask, gmask, bmask, amask;
40
41#if defined(USE_IMLIB2)
42    Imlib_Image image;
43
44    /* Load the new image */
45    image = imlib_load_image(name);
46
47    if(!image)
48    {
49        free(im);
50        return NULL;
51    }
52
53    imlib_context_set_image(image);
54    im->pixels = (char *)imlib_image_get_data_for_reading_only();
55    im->w = imlib_image_get_width();
56    im->h = imlib_image_get_height();
57    rmask = 0x00ff0000;
58    gmask = 0x0000ff00;
59    bmask = 0x000000ff;
60    amask = 0xff000000;
61    bpp = 32;
62    depth = 4;
63
64    /* Create the libcaca dither */
65    im->dither = caca_create_dither(bpp, im->w, im->h, depth * im->w,
66                                     rmask, gmask, bmask, amask);
67    if(!im->dither)
68    {
69        imlib_free_image();
70        free(im);
71        return NULL;
72    }
73
74    im->priv = (void *)image;
75
76#else
77    /* Try to load a BMP file */
78    uint32_t red[256], green[256], blue[256], alpha[256];
79    unsigned int i, colors, offset, tmp, planes;
80    caca_file_t *f;
81
82    f = caca_file_open(name, "rb");
83    if(!f)
84    {
85        free(im);
86        return NULL;
87    }
88
89    if(u16fread(f) != 0x4d42)
90    {
91        caca_file_close(f);
92        free(im);
93        return NULL;
94    }
95
96    u32fread(f); /* size */
97    u16fread(f); /* reserved 1 */
98    u16fread(f); /* reserved 2 */
99
100    offset = u32fread(f);
101
102    tmp = u32fread(f); /* header size */
103    if(tmp == 40)
104    {
105        im->w = u32fread(f);
106        im->h = u32fread(f);
107        planes = u16fread(f);
108        bpp = u16fread(f);
109
110        tmp = u32fread(f); /* compression */
111        if(tmp != 0)
112        {
113            caca_file_close(f);
114            free(im);
115            return NULL;
116        }
117
118        u32fread(f); /* sizeimage */
119        u32fread(f); /* xpelspermeter */
120        u32fread(f); /* ypelspermeter */
121        u32fread(f); /* biclrused */
122        u32fread(f); /* biclrimportantn */
123
124        colors = (offset - 54) / 4;
125        for(i = 0; i < colors && i < 256; i++)
126        {
127            blue[i] = u8fread(f) * 16;
128            green[i] = u8fread(f) * 16;
129            red[i] = u8fread(f) * 16;
130            alpha[i] = 0;
131            u8fread(f);
132        }
133    }
134    else if(tmp == 12)
135    {
136        im->w = u32fread(f);
137        im->h = u32fread(f);
138        planes = u16fread(f);
139        bpp = u16fread(f);
140
141        colors = (offset - 26) / 3;
142        for(i = 0; i < colors && i < 256; i++)
143        {
144            blue[i] = u8fread(f);
145            green[i] = u8fread(f);
146            red[i] = u8fread(f);
147            alpha[i] = 0;
148        }
149    }
150    else
151    {
152        caca_file_close(f);
153        free(im);
154        return NULL;
155    }
156
157    /* Fill the rest of the palette */
158    for(i = colors; i < 256; i++)
159        blue[i] = green[i] = red[i] = alpha[i] = 0;
160
161    depth = (bpp + 7) / 8;
162
163    /* Sanity check */
164    if(!im->w || im->w > 0x10000 || !im->h || im->h > 0x10000 || planes != 1)
165    {
166        caca_file_close(f);
167        free(im);
168        return NULL;
169    }
170
171    /* Allocate the pixel buffer */
172    im->pixels = malloc(im->w * im->h * depth);
173    if(!im->pixels)
174    {
175        caca_file_close(f);
176        free(im);
177        return NULL;
178    }
179
180    memset(im->pixels, 0, im->w * im->h * depth);
181
182    /* Read the bitmap data */
183    for(i = im->h; i--; )
184    {
185        unsigned int j, k, bits = 0;
186
187        switch(bpp)
188        {
189            case 1:
190                for(j = 0; j < im->w; j++)
191                {
192                    k = j % 32;
193                    if(k == 0)
194                        bits = u32fread(f);
195                    im->pixels[im->w * i * depth + j] =
196                        (bits >> ((k & ~0xf) + 0xf - (k & 0xf))) & 0x1;
197                }
198                break;
199            case 4:
200                for(j = 0; j < im->w; j++)
201                {
202                    k = j % 8;
203                    if(k == 0)
204                        bits = u32fread(f);
205                    im->pixels[im->w * i * depth + j] =
206                        (bits >> (4 * ((k & ~0x1) + 0x1 - (k & 0x1)))) & 0xf;
207                }
208                break;
209            default:
210                /* Works for 8bpp, but also for 16, 24 etc. */
211                caca_file_read(f, im->pixels + im->w * i * depth,
212                                im->w * depth);
213                /* Pad reads to 4 bytes */
214                tmp = (im->w * depth) % 4;
215                tmp = (4 - tmp) % 4;
216                while(tmp--)
217                    u8fread(f);
218                break;
219        }
220    }
221
222    switch(depth)
223    {
224    case 3:
225        rmask = 0xff0000;
226        gmask = 0x00ff00;
227        bmask = 0x0000ff;
228        amask = 0x000000;
229        break;
230    case 2: /* XXX: those are the 16 bits values */
231        rmask = 0x7c00;
232        gmask = 0x03e0;
233        bmask = 0x001f;
234        amask = 0x0000;
235        break;
236    case 1:
237    default:
238        bpp = 8;
239        rmask = gmask = bmask = amask = 0;
240        break;
241    }
242
243    caca_file_close(f);
244
245    /* Create the libcaca dither */
246    im->dither = caca_create_dither(bpp, im->w, im->h, depth * im->w,
247                                     rmask, gmask, bmask, amask);
248    if(!im->dither)
249    {
250        free(im->pixels);
251        free(im);
252        return NULL;
253    }
254
255    if(bpp == 8)
256        caca_set_dither_palette(im->dither, red, green, blue, alpha);
257#endif
258
259    return im;
260}
261
262void unload_image(struct image * im)
263{
264#if defined(USE_IMLIB2)
265    /* Imlib_Image image = (Imlib_Image)im->priv; */
266    imlib_free_image();
267#else
268    free(im->pixels);
269#endif
270    caca_free_dither(im->dither);
271}
272
273#if !defined(USE_IMLIB2)
274static unsigned int u32fread(caca_file_t * f)
275{
276    uint8_t buffer[4];
277    caca_file_read(f, buffer, 4);
278    return ((unsigned int)buffer[3] << 24) | ((unsigned int)buffer[2] << 16)
279             | ((unsigned int)buffer[1] << 8) | ((unsigned int)buffer[0]);
280}
281
282static unsigned int u16fread(caca_file_t * f)
283{
284    uint8_t buffer[2];
285    caca_file_read(f, buffer, 2);
286    return ((unsigned int)buffer[1] << 8) | ((unsigned int)buffer[0]);
287}
288
289static unsigned int u8fread(caca_file_t * f)
290{
291    uint8_t buffer;
292    caca_file_read(f, &buffer, 1);
293    return (unsigned int)buffer;
294}
295#endif
296
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