summaryrefslogtreecommitdiffstats
path: root/kernel/kls_hdr/fmt_codec_hdr.cpp
blob: 91f480363c11a4858cfe66438cb947dbad0841e0 (plain)
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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*  This file is part of ksquirrel-libs (http://ksquirrel.sf.net)

    Copyright (c) 2005 Dmitry Baryshev <ksquirrel@tut.by>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation;
    either version 2 of the License, or (at your option) any later
    version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "ksquirrel-libs/fmt_types.h"
#include "ksquirrel-libs/fileio.h"

#include "fmt_codec_hdr_defs.h"
#include "fmt_codec_hdr.h"

#include "ksquirrel-libs/error.h"
#include "ksquirrel-libs/fmt_utils.h"

#include "../xpm/codec_hdr.xpm"

/*
 *
 * Radiance HDR image
 *
 */

fmt_codec::fmt_codec() : fmt_codec_base()
{}

fmt_codec::~fmt_codec()
{}

void fmt_codec::options(codec_options *o)
{
    o->version = "0.1.0";
    o->name = "Radiance HDR image";
    o->filter = "*.hdr ";
    o->config = "";
    o->mime  = "#.RADIANCE";
    o->mimetype = "image/x-hdr";
    o->pixmap = codec_hdr;
    o->readable = true;
    o->canbemultiple = false;
    o->writestatic = false;
    o->writeanimated = false;
    o->needtempfile = false;
}

s32 fmt_codec::read_init(const std::string &file)
{
    scanline = 0;

    frs.open(file.c_str(), ios::binary | ios::in);

    if(!frs.good())
        return SQE_R_NOFILE;

    currentImage = -1;
    read_error = false;

    finfo.animated = false;

    if(!getHdrHead()) return SQE_R_BADFILE;

    if(strcmp(hdr.sig, "#?RADIANCE")) return SQE_R_BADFILE;

    return SQE_OK;
}

s32 fmt_codec::read_next()
{
    currentImage++;

    if(currentImage)
        return SQE_NOTOK;

	fmt_image image;

    image.w = hdr.width;
    image.h = hdr.height;
    image.bpp = 32;

    scanline = new u8 [hdr.width * sizeof(RGBA)];
    
    if(!scanline) return SQE_R_NOMEMORY;

    image.compression = "RGBE";
    image.colorspace = fmt_utils::colorSpaceByBpp(32);

    finfo.image.push_back(image);

    return SQE_OK;
}

s32 fmt_codec::read_next_pass()
{
    return SQE_OK;
}

s32 fmt_codec::read_scanline(RGBA *scan)
{
    u32 r, g, b, e, i, j;
    fmt_image *im = image(currentImage);
    fmt_utils::fillAlpha(scan, im->w);

    if(!read_scan(scanline, im->w))
	return SQE_R_BADFILE;

    for(j = 0, i = 0; j < (u32)im->w * 4; j += 4, i++)
    {
        float t;

        e = scanline[j + 3];
        r = scanline[j + 0];
        g = scanline[j + 1];
        b = scanline[j + 2];

        //t = (float)pow(2.f, ((ILint)e) - 128);
        if (e != 0)
	    e = (e - 1) << 23;

        // t = *(float *)&e;
        /* avoid "dereferencing type-punned pointer will break strict-aliasing rules" warning */
        memcpy(&t, &e, sizeof(t));
        (scan + i)->r = u8((r / 255.0f) * t);
        (scan + i)->g = u8((g / 255.0f) * t);
        (scan + i)->b = u8((b / 255.0f) * t);
    }

    return SQE_OK;
}

void fmt_codec::read_close()
{
    frs.close();

    finfo.meta.clear();
    finfo.image.clear();

    delete [] scanline;
    scanline = 0;
}

//
// These two methods were taken from DevIL
// http://imagelib.org
//

bool fmt_codec::read_scan(u8 *scanline, const s32 w)
{
	u8 *runner, c;
	u32 r, g, b, e, read, shift;

	if(!frs.readK(&c, sizeof(u8))) return false; r = c;
	if(!frs.readK(&c, sizeof(u8))) return false; g = c;
	if(!frs.readK(&c, sizeof(u8))) return false; b = c;
	if(!frs.readK(&c, sizeof(u8))) return false; e = c;

	//check if the scanline is in the new format
	//if so, e, r, g, g are stored separated and are
	//rle-compressed independently.
	if (r == 2 && g == 2)
	{
		u32 length = (b << 8) | e;
		u32 j, t, k;

		if (length > (u32)w)
			length = w; //fix broken files

		for(k = 0; k < 4; ++k)
		{
			runner = scanline + k;
			j = 0;

			while (j < length)
			{
				if(!frs.readK(&c, sizeof(u8))) return false;

				t = c;

				if(t > 128)
				{ //Run?
					if(!frs.readK(&c, sizeof(u8))) return false;

					t &= 127;

					//copy current byte
					while (t > 0 && j < length)
					{
						*runner = c;
						runner += 4;
						--t;
						++j;
					}
				}
				else
				{ //No Run.
					//read new bytes
					while (t > 0 && j < length)
					{
						if(!frs.readK(&c, sizeof(u8))) return false;

						*runner = c;
						runner += 4;
						--t;
						++j;
					}
				}
			}
		}

		return true; //done decoding a scanline in separated format
	}

	//if we come here, we are dealing with old-style scanlines
	shift = 0;
	read = 0;
	runner = scanline;

	while(read < (u32)w)
	{
		if (read != 0)
		{
		    if(!frs.readK(&c, sizeof(u8))) return false; r = c;
		    if(!frs.readK(&c, sizeof(u8))) return false; g = c;
		    if(!frs.readK(&c, sizeof(u8))) return false; b = c;
		    if(!frs.readK(&c, sizeof(u8))) return false; e = c;
		}

		//if all three mantissas are 1, then this is a rle
		//count dword
		if (r == 1 && g == 1 && b == 1)
		{
			u32 length = e;
			u32 j;

			for (j = length << shift; j > 0; --j)
			{
				memcpy(runner, runner - 4, 4);
				runner += 4;
			}
			//if more than one rle count dword is read
			//consecutively, they are higher order bytes
			//of the first read value. shift keeps track of
			//that.
			shift += 8;
			read += length;
		}
		else
		{
			runner[0] = r;
			runner[1] = g;
			runner[2] = b;
			runner[3] = e;

			shift = 0;
			runner += 4;
			++read;
		}
	}

    return true;
}

bool fmt_codec::getHdrHead()
{
	bool done = false;
	s8 a, b;
	s8 x[2], y[2];
	const u32 buffSize = 80;
	s8 buff[buffSize];
	u32 count = 0;

	if(!frs.readK(hdr.sig, sizeof(hdr.sig)-1)) return false;

	hdr.sig[10] = '\0';

	//skip lines until an empty line is found.
	//this marks the end of header information,
	//the next line contains the image's dimension.

	//TODO: read header contents into variables
	//(EXPOSURE, orientation, xyz correction, ...)

	if(!frs.readK(&a, sizeof(s8)))
		return false;

	while(!done)
	{
		if(!frs.readK(&b, sizeof(s8))) return false;

		if (b == '\n' && a == '\n')
			done = true;
		else
			a = b;
	}

	//read dimensions (note that this assumes a somewhat valid image)
	if(!frs.readK(&a, sizeof(s8))) return false;

	while (a != '\n')
	{
		buff[count] = a;

		if(!frs.readK(&a, sizeof(s8))) return false;

		++count;
		if (count > buffSize-1) {
			return false;
		}
	}

	buff[count] = '\0';

	sscanf(buff, "%s %d %s %d", x, &hdr.width, y, &hdr.height);

	return true;
}

#include "fmt_codec_cd_func.h"