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- Use pointers instead of repeating access to array element
[kugel-rb.git] / apps / recorder / jpeg_load.c
blobec1143f2798ea9db6201e5c429c4524791941aa9
1 /***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * JPEG image viewer
11 * (This is a real mess if it has to be coded in one single C file)
12 *
13 * Copyright (C) 2009 Andrew Mahone fractional decode, split IDCT - 16-point
14 * IDCT based on IJG jpeg-7 pre-release
15 * File scrolling addition (C) 2005 Alexander Spyridakis
16 * Copyright (C) 2004 Jörg Hohensohn aka [IDC]Dragon
17 * Heavily borrowed from the IJG implementation (C) Thomas G. Lane
18 * Small & fast downscaling IDCT (C) 2002 by Guido Vollbeding JPEGclub.org
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version 2
23 * of the License, or (at your option) any later version.
24 *
25 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
26 * KIND, either express or implied.
27 *
28 ****************************************************************************/
29
30 #include "plugin.h"
31 #include "debug.h"
32 #include "jpeg_load.h"
33 /*#define JPEG_BS_DEBUG*/
34 //#define ROCKBOX_DEBUG_JPEG
35 /* for portability of below JPEG code */
36 #define MEMSET(p,v,c) memset(p,v,c)
37 #define MEMCPY(d,s,c) memcpy(d,s,c)
38 #define INLINE static inline
39 #define ENDIAN_SWAP16(n) n /* only for poor little endian machines */
40 #ifdef ROCKBOX_DEBUG_JPEG
41 #define JDEBUGF DEBUGF
42 #else
43 #define JDEBUGF(...)
44 #endif
45
46 /**************** begin JPEG code ********************/
47
48 #ifdef HAVE_LCD_COLOR
49 typedef struct uint8_rgb jpeg_pix_t;
50 #else
51 typedef uint8_t jpeg_pix_t;
52 #endif
53 #define JPEG_IDCT_TRANSPOSE
54 #define JPEG_PIX_SZ (sizeof(jpeg_pix_t))
55 #ifdef HAVE_LCD_COLOR
56 #define COLOR_EXTRA_IDCT_WS 64
57 #else
58 #define COLOR_EXTRA_IDCT_WS 0
59 #endif
60 #ifdef JPEG_IDCT_TRANSPOSE
61 #define V_OUT(n) ws2[8*n]
62 #define V_IN_ST 1
63 #define TRANSPOSE_EXTRA_IDCT_WS 64
64 #else
65 #define V_OUT(n) ws[8*n]
66 #define V_IN_ST 8
67 #define TRANSPOSE_EXTRA_IDCT_WS 0
68 #endif
69 #define IDCT_WS_SIZE (64 + TRANSPOSE_EXTRA_IDCT_WS + COLOR_EXTRA_IDCT_WS)
70
71 /* This can't be in jpeg_load.h because plugin.h includes it, and it conflicts
72 * with the definition in jpeg_decoder.h
73 */
74 struct jpeg
75 {
76 #ifdef JPEG_FROM_MEM
77 unsigned char *data;
78 unsigned long len;
79 #else
80 int fd;
81 int buf_left;
82 int buf_index;
83 #endif
84 unsigned long int bitbuf;
85 int bitbuf_bits;
86 int marker_ind;
87 int marker_val;
88 unsigned char marker;
89 int x_size, y_size; /* size of image (can be less than block boundary) */
90 int x_phys, y_phys; /* physical size, block aligned */
91 int x_mbl; /* x dimension of MBL */
92 int y_mbl; /* y dimension of MBL */
93 int blocks; /* blocks per MB */
94 int restart_interval; /* number of MCUs between RSTm markers */
95 int restart; /* blocks until next restart marker */
96 int mcu_row; /* current row relative to first row of this row of MCUs */
97 unsigned char *out_ptr; /* pointer to current row to output */
98 int cur_row; /* current row relative to top of image */
99 int set_rows;
100 int store_pos[4]; /* for Y block ordering */
101 #ifdef HAVE_LCD_COLOR
102 int last_dc_val[3];
103 int h_scale[2]; /* horizontal scalefactor = (2**N) / 8 */
104 int v_scale[2]; /* same as above, for vertical direction */
105 int k_need[2]; /* per component zig-zag index of last needed coefficient */
106 int zero_need[2]; /* per compenent number of coefficients to zero */
107 #else
108 int last_dc_val;
109 int h_scale[1]; /* horizontal scalefactor = (2**N) / 8 */
110 int v_scale[1]; /* same as above, for vertical direction */
111 int k_need[1]; /* per component zig-zag index of last needed coefficient */
112 int zero_need[1]; /* per compenent number of coefficients to zero */
113 #endif
114 jpeg_pix_t *img_buf;
115
116 int16_t quanttable[4][QUANT_TABLE_LENGTH];/* raw quantization tables 0-3 */
117
118 struct huffman_table hufftable[2]; /* Huffman tables */
119 struct derived_tbl dc_derived_tbls[2]; /* Huffman-LUTs */
120 struct derived_tbl ac_derived_tbls[2];
121
122 struct frame_component frameheader[3]; /* Component descriptor */
123 struct scan_component scanheader[3]; /* currently not used */
124
125 int mcu_membership[6]; /* info per block */
126 int tab_membership[6];
127 int subsample_x[3]; /* info per component */
128 int subsample_y[3];
129 bool resize;
130 unsigned char buf[JPEG_READ_BUF_SIZE];
131 struct img_part part;
132 };
133
134 #ifdef JPEG_FROM_MEM
135 static struct jpeg jpeg;
136 #endif
137
138 INLINE unsigned range_limit(int value)
139 {
140 #if CONFIG_CPU == SH7034
141 unsigned tmp;
142 asm ( /* Note: Uses knowledge that only low byte of result is used */
143 "extu.b %[v],%[t] \n"
144 "cmp/eq %[v],%[t] \n" /* low byte == whole number ? */
145 "bt 1f \n" /* yes: no overflow */
146 "cmp/pz %[v] \n" /* overflow: positive? */
147 "subc %[v],%[v] \n" /* %[r] now either 0 or 0xffffffff */
148 "1: \n"
149 : /* outputs */
150 [v]"+r"(value),
151 [t]"=&r"(tmp)
152 );
153 return value;
154 #elif defined(CPU_COLDFIRE)
155 /* Note: Uses knowledge that only the low byte of the result is used */
156 asm (
157 "cmp.l #255,%[v] \n" /* overflow? */
158 "bls.b 1f \n" /* no: return value */
159 /* yes: set low byte to appropriate boundary */
160 "spl.b %[v] \n"
161 "1: \n"
162 : /* outputs */
163 [v]"+d"(value)
164 );
165 return value;
166 #elif defined(CPU_ARM)
167 /* Note: Uses knowledge that only the low byte of the result is used */
168 asm (
169 "cmp %[v], #255 \n" /* out of range 0..255? */
170 "mvnhi %[v], %[v], asr #31 \n" /* yes: set all bits to ~(sign_bit) */
171 : /* outputs */
172 [v]"+r"(value)
173 );
174 return value;
175 #else
176 if ((unsigned)value <= 255)
177 return value;
178
179 if (value < 0)
180 return 0;
181
182 return 255;
183 #endif
184 }
185
186 INLINE unsigned scale_output(int value)
187 {
188 #if defined(CPU_ARM) && ARM_ARCH >= 6
189 asm (
190 "usat %[v], #8, %[v], asr #18\n"
191 : [v] "+r" (value)
192 );
193 return value;
194 #else
195 return range_limit(value >> 18);
196 #endif
197 }
198
199 /* IDCT implementation */
200
201
202 #define CONST_BITS 13
203 #define PASS1_BITS 2
204
205
206 /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
207 * causing a lot of useless floating-point operations at run time.
208 * To get around this we use the following pre-calculated constants.
209 * If you change CONST_BITS you may want to add appropriate values.
210 * (With a reasonable C compiler, you can just rely on the FIX() macro...)
211 */
212 #define FIX_0_298631336 2446 /* FIX(0.298631336) */
213 #define FIX_0_390180644 3196 /* FIX(0.390180644) */
214 #define FIX_0_541196100 4433 /* FIX(0.541196100) */
215 #define FIX_0_765366865 6270 /* FIX(0.765366865) */
216 #define FIX_0_899976223 7373 /* FIX(0.899976223) */
217 #define FIX_1_175875602 9633 /* FIX(1.175875602) */
218 #define FIX_1_501321110 12299 /* FIX(1.501321110) */
219 #define FIX_1_847759065 15137 /* FIX(1.847759065) */
220 #define FIX_1_961570560 16069 /* FIX(1.961570560) */
221 #define FIX_2_053119869 16819 /* FIX(2.053119869) */
222 #define FIX_2_562915447 20995 /* FIX(2.562915447) */
223 #define FIX_3_072711026 25172 /* FIX(3.072711026) */
224
225
226
227 /* Multiply an long variable by an long constant to yield an long result.
228 * For 8-bit samples with the recommended scaling, all the variable
229 * and constant values involved are no more than 16 bits wide, so a
230 * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
231 * For 12-bit samples, a full 32-bit multiplication will be needed.
232 */
233 #define MULTIPLY(var1, var2) ((var1) * (var2))
234
235 #if defined(CPU_SH) || defined(CPU_COLDFIRE) || \
236 (defined(CPU_ARM) && ARM_ARCH > 4)
237 #define MULTIPLY16(var,const) (((short) (var)) * ((short) (const)))
238 #else
239 #define MULTIPLY16 MULTIPLY
240 #endif
241
242 /*
243 * Macros for handling fixed-point arithmetic; these are used by many
244 * but not all of the DCT/IDCT modules.
245 *
246 * All values are expected to be of type INT32.
247 * Fractional constants are scaled left by CONST_BITS bits.
248 * CONST_BITS is defined within each module using these macros,
249 * and may differ from one module to the next.
250 */
251 #define ONE ((long)1)
252 #define CONST_SCALE (ONE << CONST_BITS)
253
254 /* Convert a positive real constant to an integer scaled by CONST_SCALE.
255 * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,
256 * thus causing a lot of useless floating-point operations at run time.
257 */
258 #define FIX(x) ((long) ((x) * CONST_SCALE + 0.5))
259 #define RIGHT_SHIFT(x,shft) ((x) >> (shft))
260
261 /* Descale and correctly round an int value that's scaled by N bits.
262 * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
263 * the fudge factor is correct for either sign of X.
264 */
265 #define DESCALE(x,n) (((x) + (1l << ((n)-1))) >> (n))
266
267 #define DS_OUT ((CONST_BITS)+(PASS1_BITS)+3)
268
269 /*
270 * Conversion of full 0-255 range YCrCb to RGB:
271 * |R| |1.000000 -0.000001 1.402000| |Y'|
272 * |G| = |1.000000 -0.334136 -0.714136| |Pb|
273 * |B| |1.000000 1.772000 0.000000| |Pr|
274 * Scaled (yields s15-bit output):
275 * |R| |128 0 179| |Y |
276 * |G| = |128 -43 -91| |Cb - 128|
277 * |B| |128 227 0| |Cr - 128|
278 */
279 #define YFAC 128
280 #define RVFAC 179
281 #define GUFAC (-43)
282 #define GVFAC (-91)
283 #define BUFAC 227
284 #define COMPONENT_SHIFT 15
285
286 #ifndef CPU_ARM
287 /* horizontal-pass 1-point IDCT */
288 static void jpeg_idct1h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep)
289 {
290 for (; ws < end; ws += 8)
291 {
292 *out = range_limit(128 + (int) DESCALE(*ws, 3 + PASS1_BITS));
293 out += rowstep;
294 }
295 }
296
297 /* vertical-pass 2-point IDCT */
298 static void jpeg_idct2v(int16_t *ws, int16_t *end)
299 {
300 for (; ws < end; ws++)
301 {
302 int tmp1 = ws[0*8];
303 int tmp2 = ws[1*8];
304 ws[0*8] = tmp1 + tmp2;
305 ws[1*8] = tmp1 - tmp2;
306 }
307 }
308
309 /* horizontal-pass 2-point IDCT */
310 static void jpeg_idct2h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep)
311 {
312 for (; ws < end; ws += 8, out += rowstep)
313 {
314 int tmp1 = ws[0] + (ONE << (PASS1_BITS + 2))
315 + (128 << (PASS1_BITS + 3));
316 int tmp2 = ws[1];
317 out[JPEG_PIX_SZ*0] = range_limit((int) RIGHT_SHIFT(tmp1 + tmp2,
318 PASS1_BITS + 3));
319 out[JPEG_PIX_SZ*1] = range_limit((int) RIGHT_SHIFT(tmp1 - tmp2,
320 PASS1_BITS + 3));
321 }
322 }
323
324 /* vertical-pass 4-point IDCT */
325 static void jpeg_idct4v(int16_t *ws, int16_t *end)
326 {
327 for (; ws < end; ws++)
328 {
329 int tmp0, tmp2, tmp10, tmp12;
330 int z1, z2, z3;
331 /* Even part */
332
333 tmp0 = ws[8*0];
334 tmp2 = ws[8*2];
335
336 tmp10 = (tmp0 + tmp2) << PASS1_BITS;
337 tmp12 = (tmp0 - tmp2) << PASS1_BITS;
338
339 /* Odd part */
340 /* Same rotation as in the even part of the 8x8 LL&M IDCT */
341
342 z2 = ws[8*1];
343 z3 = ws[8*3];
344
345 z1 = MULTIPLY16(z2 + z3, FIX_0_541196100) +
346 (ONE << (CONST_BITS - PASS1_BITS - 1));
347 tmp0 = RIGHT_SHIFT(z1 + MULTIPLY16(z3, - FIX_1_847759065),
348 CONST_BITS-PASS1_BITS);
349 tmp2 = RIGHT_SHIFT(z1 + MULTIPLY16(z2, FIX_0_765366865),
350 CONST_BITS-PASS1_BITS);
351
352 /* Final output stage */
353 ws[8*0] = (int) (tmp10 + tmp2);
354 ws[8*3] = (int) (tmp10 - tmp2);
355 ws[8*1] = (int) (tmp12 + tmp0);
356 ws[8*2] = (int) (tmp12 - tmp0);
357 }
358 }
359
360 /* horizontal-pass 4-point IDCT */
361 static void jpeg_idct4h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep)
362 {
363 for (; ws < end; out += rowstep, ws += 8)
364 {
365 int tmp0, tmp2, tmp10, tmp12;
366 int z1, z2, z3;
367 /* Even part */
368
369 tmp0 = (int) ws[0] + (ONE << (PASS1_BITS + 2))
370 + (128 << (PASS1_BITS + 3));
371 tmp2 = (int) ws[2];
372
373 tmp10 = (tmp0 + tmp2) << CONST_BITS;
374 tmp12 = (tmp0 - tmp2) << CONST_BITS;
375
376 /* Odd part */
377 /* Same rotation as in the even part of the 8x8 LL&M IDCT */
378
379 z2 = (int) ws[1];
380 z3 = (int) ws[3];
381
382 z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
383 tmp0 = z1 - MULTIPLY16(z3, FIX_1_847759065);
384 tmp2 = z1 + MULTIPLY16(z2, FIX_0_765366865);
385
386 /* Final output stage */
387
388 out[JPEG_PIX_SZ*0] = range_limit((int) RIGHT_SHIFT(tmp10 + tmp2,
389 DS_OUT));
390 out[JPEG_PIX_SZ*3] = range_limit((int) RIGHT_SHIFT(tmp10 - tmp2,
391 DS_OUT));
392 out[JPEG_PIX_SZ*1] = range_limit((int) RIGHT_SHIFT(tmp12 + tmp0,
393 DS_OUT));
394 out[JPEG_PIX_SZ*2] = range_limit((int) RIGHT_SHIFT(tmp12 - tmp0,
395 DS_OUT));
396 }
397 }
398
399 /* vertical-pass 8-point IDCT */
400 static void jpeg_idct8v(int16_t *ws, int16_t *end)
401 {
402 long tmp0, tmp1, tmp2, tmp3;
403 long tmp10, tmp11, tmp12, tmp13;
404 long z1, z2, z3, z4, z5;
405 #ifdef JPEG_IDCT_TRANSPOSE
406 int16_t *ws2 = ws + 64;
407 for (; ws < end; ws += 8, ws2++)
408 {
409 #else
410 for (; ws < end; ws++)
411 {
412 #endif
413 /* Due to quantization, we will usually find that many of the input
414 * coefficients are zero, especially the AC terms. We can exploit this
415 * by short-circuiting the IDCT calculation for any column in which all
416 * the AC terms are zero. In that case each output is equal to the
417 * DC coefficient (with scale factor as needed).
418 * With typical images and quantization tables, half or more of the
419 * column DCT calculations can be simplified this way.
420 */
421 if ((ws[V_IN_ST*1] | ws[V_IN_ST*2] | ws[V_IN_ST*3]
422 | ws[V_IN_ST*4] | ws[V_IN_ST*5] | ws[V_IN_ST*6] | ws[V_IN_ST*7]) == 0)
423 {
424 /* AC terms all zero */
425 int dcval = ws[V_IN_ST*0] << PASS1_BITS;
426
427 V_OUT(0) = V_OUT(1) = V_OUT(2) = V_OUT(3) = V_OUT(4) = V_OUT(5) =
428 V_OUT(6) = V_OUT(7) = dcval;
429 continue;
430 }
431
432 /* Even part: reverse the even part of the forward DCT. */
433 /* The rotator is sqrt(2)*c(-6). */
434
435 z2 = ws[V_IN_ST*2];
436 z3 = ws[V_IN_ST*6];
437
438 z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
439 tmp2 = z1 + MULTIPLY16(z3, - FIX_1_847759065);
440 tmp3 = z1 + MULTIPLY16(z2, FIX_0_765366865);
441
442 z2 = ws[V_IN_ST*0] << CONST_BITS;
443 z2 += ONE << (CONST_BITS - PASS1_BITS - 1);
444 z3 = ws[V_IN_ST*4] << CONST_BITS;
445
446 tmp0 = (z2 + z3);
447 tmp1 = (z2 - z3);
448
449 tmp10 = tmp0 + tmp3;
450 tmp13 = tmp0 - tmp3;
451 tmp11 = tmp1 + tmp2;
452 tmp12 = tmp1 - tmp2;
453
454 /* Odd part per figure 8; the matrix is unitary and hence its
455 transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */
456
457 tmp0 = ws[V_IN_ST*7];
458 tmp1 = ws[V_IN_ST*5];
459 tmp2 = ws[V_IN_ST*3];
460 tmp3 = ws[V_IN_ST*1];
461
462 z1 = tmp0 + tmp3;
463 z2 = tmp1 + tmp2;
464 z3 = tmp0 + tmp2;
465 z4 = tmp1 + tmp3;
466 z5 = MULTIPLY16(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
467
468 tmp0 = MULTIPLY16(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
469 tmp1 = MULTIPLY16(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
470 tmp2 = MULTIPLY16(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
471 tmp3 = MULTIPLY16(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
472 z1 = MULTIPLY16(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
473 z2 = MULTIPLY16(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
474 z3 = MULTIPLY16(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
475 z4 = MULTIPLY16(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
476
477 z3 += z5;
478 z4 += z5;
479
480 tmp0 += z1 + z3;
481 tmp1 += z2 + z4;
482 tmp2 += z2 + z3;
483 tmp3 += z1 + z4;
484
485 /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
486
487 V_OUT(0) = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
488 V_OUT(7) = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
489 V_OUT(1) = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
490 V_OUT(6) = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
491 V_OUT(2) = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
492 V_OUT(5) = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
493 V_OUT(3) = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
494 V_OUT(4) = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
495 }
496 }
497
498 /* horizontal-pass 8-point IDCT */
499 static void jpeg_idct8h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep)
500 {
501 long tmp0, tmp1, tmp2, tmp3;
502 long tmp10, tmp11, tmp12, tmp13;
503 long z1, z2, z3, z4, z5;
504 for (; ws < end; out += rowstep, ws += 8)
505 {
506 /* Rows of zeroes can be exploited in the same way as we did with
507 * columns. However, the column calculation has created many nonzero AC
508 * terms, so the simplification applies less often (typically 5% to 10%
509 * of the time). On machines with very fast multiplication, it's
510 * possible that the test takes more time than it's worth. In that
511 * case this section may be commented out.
512 */
513
514 #ifndef NO_ZERO_ROW_TEST
515 if ((ws[1] | ws[2] | ws[3]
516 | ws[4] | ws[5] | ws[6] | ws[7]) == 0)
517 {
518 /* AC terms all zero */
519 unsigned char dcval = range_limit(128 + (int) DESCALE((long) ws[0],
520 PASS1_BITS+3));
521
522 out[JPEG_PIX_SZ*0] = dcval;
523 out[JPEG_PIX_SZ*1] = dcval;
524 out[JPEG_PIX_SZ*2] = dcval;
525 out[JPEG_PIX_SZ*3] = dcval;
526 out[JPEG_PIX_SZ*4] = dcval;
527 out[JPEG_PIX_SZ*5] = dcval;
528 out[JPEG_PIX_SZ*6] = dcval;
529 out[JPEG_PIX_SZ*7] = dcval;
530 continue;
531 }
532 #endif
533
534 /* Even part: reverse the even part of the forward DCT. */
535 /* The rotator is sqrt(2)*c(-6). */
536
537 z2 = (long) ws[2];
538 z3 = (long) ws[6];
539
540 z1 = MULTIPLY16(z2 + z3, FIX_0_541196100);
541 tmp2 = z1 + MULTIPLY16(z3, - FIX_1_847759065);
542 tmp3 = z1 + MULTIPLY16(z2, FIX_0_765366865);
543
544 z4 = (long) ws[0] + (ONE << (PASS1_BITS + 2))
545 + (128 << (PASS1_BITS + 3));
546 z4 <<= CONST_BITS;
547 z5 = (long) ws[4] << CONST_BITS;
548 tmp0 = z4 + z5;
549 tmp1 = z4 - z5;
550
551 tmp10 = tmp0 + tmp3;
552 tmp13 = tmp0 - tmp3;
553 tmp11 = tmp1 + tmp2;
554 tmp12 = tmp1 - tmp2;
555
556 /* Odd part per figure 8; the matrix is unitary and hence its
557 * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */
558
559 tmp0 = (long) ws[7];
560 tmp1 = (long) ws[5];
561 tmp2 = (long) ws[3];
562 tmp3 = (long) ws[1];
563
564 z1 = tmp0 + tmp3;
565 z2 = tmp1 + tmp2;
566 z3 = tmp0 + tmp2;
567 z4 = tmp1 + tmp3;
568 z5 = MULTIPLY16(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
569
570 tmp0 = MULTIPLY16(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
571 tmp1 = MULTIPLY16(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
572 tmp2 = MULTIPLY16(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
573 tmp3 = MULTIPLY16(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
574 z1 = MULTIPLY16(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
575 z2 = MULTIPLY16(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
576 z3 = MULTIPLY16(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
577 z4 = MULTIPLY16(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
578
579 z3 += z5;
580 z4 += z5;
581
582 tmp0 += z1 + z3;
583 tmp1 += z2 + z4;
584 tmp2 += z2 + z3;
585 tmp3 += z1 + z4;
586
587 /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
588
589 out[JPEG_PIX_SZ*0] = range_limit((int) RIGHT_SHIFT(tmp10 + tmp3,
590 DS_OUT));
591 out[JPEG_PIX_SZ*7] = range_limit((int) RIGHT_SHIFT(tmp10 - tmp3,
592 DS_OUT));
593 out[JPEG_PIX_SZ*1] = range_limit((int) RIGHT_SHIFT(tmp11 + tmp2,
594 DS_OUT));
595 out[JPEG_PIX_SZ*6] = range_limit((int) RIGHT_SHIFT(tmp11 - tmp2,
596 DS_OUT));
597 out[JPEG_PIX_SZ*2] = range_limit((int) RIGHT_SHIFT(tmp12 + tmp1,
598 DS_OUT));
599 out[JPEG_PIX_SZ*5] = range_limit((int) RIGHT_SHIFT(tmp12 - tmp1,
600 DS_OUT));
601 out[JPEG_PIX_SZ*3] = range_limit((int) RIGHT_SHIFT(tmp13 + tmp0,
602 DS_OUT));
603 out[JPEG_PIX_SZ*4] = range_limit((int) RIGHT_SHIFT(tmp13 - tmp0,
604 DS_OUT));
605 }
606 }
607
608 #else
609 extern void jpeg_idct1h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep);
610 extern void jpeg_idct2v(int16_t *ws, int16_t *end);
611 extern void jpeg_idct2h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep);
612 extern void jpeg_idct4v(int16_t *ws, int16_t *end);
613 extern void jpeg_idct4h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep);
614 extern void jpeg_idct8v(int16_t *ws, int16_t *end);
615 extern void jpeg_idct8h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep);
616 #endif
617
618 #ifdef HAVE_LCD_COLOR
619 /* vertical-pass 16-point IDCT */
620 static void jpeg_idct16v(int16_t *ws, int16_t *end)
621 {
622 long tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13;
623 long tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
624 long z1, z2, z3, z4;
625 #ifdef JPEG_IDCT_TRANSPOSE
626 int16_t *ws2 = ws + 64;
627 for (; ws < end; ws += 8, ws2++)
628 {
629 #else
630 for (; ws < end; ws++)
631 {
632 #endif
633 /* Even part */
634
635 tmp0 = ws[V_IN_ST*0] << CONST_BITS;
636 /* Add fudge factor here for final descale. */
637 tmp0 += 1 << (CONST_BITS-PASS1_BITS-1);
638
639 z1 = ws[V_IN_ST*4];
640 tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */
641 tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */
642
643 tmp10 = tmp0 + tmp1;
644 tmp11 = tmp0 - tmp1;
645 tmp12 = tmp0 + tmp2;
646 tmp13 = tmp0 - tmp2;
647
648 z1 = ws[V_IN_ST*2];
649 z2 = ws[V_IN_ST*6];
650 z3 = z1 - z2;
651 z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */
652 z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */
653
654 /* (c6+c2)[16] = (c3+c1)[8] */
655 tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);
656 /* (c6-c14)[16] = (c3-c7)[8] */
657 tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);
658 /* (c2-c10)[16] = (c1-c5)[8] */
659 tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887));
660 /* (c10-c14)[16] = (c5-c7)[8] */
661 tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579));
662
663 tmp20 = tmp10 + tmp0;
664 tmp27 = tmp10 - tmp0;
665 tmp21 = tmp12 + tmp1;
666 tmp26 = tmp12 - tmp1;
667 tmp22 = tmp13 + tmp2;
668 tmp25 = tmp13 - tmp2;
669 tmp23 = tmp11 + tmp3;
670 tmp24 = tmp11 - tmp3;
671
672 /* Odd part */
673
674 z1 = ws[V_IN_ST*1];
675 z2 = ws[V_IN_ST*3];
676 z3 = ws[V_IN_ST*5];
677 z4 = ws[V_IN_ST*7];
678
679 tmp11 = z1 + z3;
680
681 tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */
682 tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */
683 tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */
684 tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */
685 tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */
686 tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */
687 tmp0 = tmp1 + tmp2 + tmp3 -
688 MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */
689 tmp13 = tmp10 + tmp11 + tmp12 -
690 MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */
691 z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */
692 tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */
693 tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */
694 z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */
695 tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */
696 tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */
697 z2 += z4;
698 z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */
699 tmp1 += z1;
700 tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */
701 z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */
702 tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */
703 tmp12 += z2;
704 z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
705 tmp2 += z2;
706 tmp3 += z2;
707 z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */
708 tmp10 += z2;
709 tmp11 += z2;
710
711 /* Final output stage */
712 V_OUT(0) = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS);
713 V_OUT(15) = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS);
714 V_OUT(1) = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS);
715 V_OUT(14) = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS);
716 V_OUT(2) = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS);
717 V_OUT(13) = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS);
718 V_OUT(3) = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS);
719 V_OUT(12) = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS);
720 V_OUT(4) = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS);
721 V_OUT(11) = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS);
722 V_OUT(5) = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS);
723 V_OUT(10) = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS);
724 V_OUT(6) = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS);
725 V_OUT(9) = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS);
726 V_OUT(7) = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS);
727 V_OUT(8) = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS);
728 }
729 }
730
731 /* horizontal-pass 16-point IDCT */
732 static void jpeg_idct16h(int16_t *ws, unsigned char *out, int16_t *end, int rowstep)
733 {
734 long tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13;
735 long tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27;
736 long z1, z2, z3, z4;
737 for (; ws < end; out += rowstep, ws += 8)
738 {
739 /* Even part */
740
741 /* Add fudge factor here for final descale. */
742 tmp0 = (long) ws[0] + (ONE << (PASS1_BITS+2))
743 + (128 << (PASS1_BITS + 3));
744 tmp0 <<= CONST_BITS;
745
746 z1 = (long) ws[4];
747 tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */
748 tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */
749
750 tmp10 = tmp0 + tmp1;
751 tmp11 = tmp0 - tmp1;
752 tmp12 = tmp0 + tmp2;
753 tmp13 = tmp0 - tmp2;
754
755 z1 = (long) ws[2];
756 z2 = (long) ws[6];
757 z3 = z1 - z2;
758 z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */
759 z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */
760
761 /* (c6+c2)[16] = (c3+c1)[8] */
762 tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447);
763 /* (c6-c14)[16] = (c3-c7)[8] */
764 tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223);
765 /* (c2-c10)[16] = (c1-c5)[8] */
766 tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887));
767 /* (c10-c14)[16] = (c5-c7)[8] */
768 tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579));
769
770 tmp20 = tmp10 + tmp0;
771 tmp27 = tmp10 - tmp0;
772 tmp21 = tmp12 + tmp1;
773 tmp26 = tmp12 - tmp1;
774 tmp22 = tmp13 + tmp2;
775 tmp25 = tmp13 - tmp2;
776 tmp23 = tmp11 + tmp3;
777 tmp24 = tmp11 - tmp3;
778
779 /* Odd part */
780
781 z1 = (long) ws[1];
782 z2 = (long) ws[3];
783 z3 = (long) ws[5];
784 z4 = (long) ws[7];
785
786 tmp11 = z1 + z3;
787
788 tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */
789 tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */
790 tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */
791 tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */
792 tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */
793 tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */
794 tmp0 = tmp1 + tmp2 + tmp3 -
795 MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */
796 tmp13 = tmp10 + tmp11 + tmp12 -
797 MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */
798 z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */
799 tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */
800 tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */
801 z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */
802 tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */
803 tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */
804 z2 += z4;
805 z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */
806 tmp1 += z1;
807 tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */
808 z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */
809 tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */
810 tmp12 += z2;
811 z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */
812 tmp2 += z2;
813 tmp3 += z2;
814 z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */
815 tmp10 += z2;
816 tmp11 += z2;
817
818 /* Final output stage */
819
820 out[JPEG_PIX_SZ*0] = scale_output(tmp20 + tmp0);
821 out[JPEG_PIX_SZ*15] = scale_output(tmp20 - tmp0);
822 out[JPEG_PIX_SZ*1] = scale_output(tmp21 + tmp1);
823 out[JPEG_PIX_SZ*14] = scale_output(tmp21 - tmp1);
824 out[JPEG_PIX_SZ*2] = scale_output(tmp22 + tmp2);
825 out[JPEG_PIX_SZ*13] = scale_output(tmp22 - tmp2);
826 out[JPEG_PIX_SZ*3] = scale_output(tmp23 + tmp3);
827 out[JPEG_PIX_SZ*12] = scale_output(tmp23 - tmp3);
828 out[JPEG_PIX_SZ*4] = scale_output(tmp24 + tmp10);
829 out[JPEG_PIX_SZ*11] = scale_output(tmp24 - tmp10);
830 out[JPEG_PIX_SZ*5] = scale_output(tmp25 + tmp11);
831 out[JPEG_PIX_SZ*10] = scale_output(tmp25 - tmp11);
832 out[JPEG_PIX_SZ*6] = scale_output(tmp26 + tmp12);
833 out[JPEG_PIX_SZ*9] = scale_output(tmp26 - tmp12);
834 out[JPEG_PIX_SZ*7] = scale_output(tmp27 + tmp13);
835 out[JPEG_PIX_SZ*8] = scale_output(tmp27 - tmp13);
836 }
837 }
838 #endif
839
840 struct idct_entry {
841 int scale;
842 void (*v_idct)(int16_t *ws, int16_t *end);
843 void (*h_idct)(int16_t *ws, unsigned char *out, int16_t *end, int rowstep);
844 };
845
846 struct idct_entry idct_tbl[] = {
847 { PASS1_BITS, NULL, jpeg_idct1h },
848 { PASS1_BITS, jpeg_idct2v, jpeg_idct2h },
849 { 0, jpeg_idct4v, jpeg_idct4h },
850 { 0, jpeg_idct8v, jpeg_idct8h },
851 #ifdef HAVE_LCD_COLOR
852 { 0, jpeg_idct16v, jpeg_idct16h },
853 #endif
854 };
855
856 /* JPEG decoder implementation */
857
858 #ifdef JPEG_FROM_MEM
859 INLINE unsigned char *getc(struct jpeg* p_jpeg)
860 {
861 if (LIKELY(p_jpeg->len))
862 {
863 p_jpeg->len--;
864 return p_jpeg->data++;
865 } else
866 return NULL;
867 }
868
869 INLINE bool skip_bytes(struct jpeg* p_jpeg, int count)
870 {
871 if (p_jpeg->len >= (unsigned)count)
872 {
873 p_jpeg->len -= count;
874 p_jpeg->data += count;
875 return true;
876 } else {
877 p_jpeg->data += p_jpeg->len;
878 p_jpeg->len = 0;
879 return false;
880 }
881 }
882
883 INLINE void putc(struct jpeg* p_jpeg)
884 {
885 p_jpeg->len++;
886 p_jpeg->data--;
887 }
888 #else
889 INLINE void fill_buf(struct jpeg* p_jpeg)
890 {
891 p_jpeg->buf_left = read(p_jpeg->fd, p_jpeg->buf, JPEG_READ_BUF_SIZE);
892 p_jpeg->buf_index = 0;
893 }
894
895 static unsigned char *getc(struct jpeg* p_jpeg)
896 {
897 if (UNLIKELY(p_jpeg->buf_left < 1))
898 fill_buf(p_jpeg);
899 if (UNLIKELY(p_jpeg->buf_left < 1))
900 return NULL;
901 p_jpeg->buf_left--;
902 return (p_jpeg->buf_index++) + p_jpeg->buf;
903 }
904
905 INLINE bool skip_bytes_seek(struct jpeg* p_jpeg)
906 {
907 if (UNLIKELY(lseek(p_jpeg->fd, -p_jpeg->buf_left, SEEK_CUR) < 0))
908 return false;
909 p_jpeg->buf_left = 0;
910 return true;
911 }
912
913 static bool skip_bytes(struct jpeg* p_jpeg, int count)
914 {
915 p_jpeg->buf_left -= count;
916 p_jpeg->buf_index += count;
917 return p_jpeg->buf_left >= 0 || skip_bytes_seek(p_jpeg);
918 }
919
920 static void putc(struct jpeg* p_jpeg)
921 {
922 p_jpeg->buf_left++;
923 p_jpeg->buf_index--;
924 }
925 #endif
926
927 #define e_skip_bytes(jpeg, count) \
928 do {\
929 if (UNLIKELY(!skip_bytes((jpeg),(count)))) \
930 return -1; \
931 } while (0)
932
933 #define e_getc(jpeg, code) \
934 ({ \
935 unsigned char *c; \
936 if (UNLIKELY(!(c = getc(jpeg)))) \
937 return (code); \
938 *c; \
939 })
940
941 #define d_getc(jpeg, def) \
942 ({ \
943 unsigned char *cp = getc(jpeg); \
944 unsigned char c = LIKELY(cp) ? *cp : (def); \
945 c; \
946 })
947
948 /* Preprocess the JPEG JFIF file */
949 static int process_markers(struct jpeg* p_jpeg)
950 {
951 unsigned char c;
952 int marker_size; /* variable length of marker segment */
953 int i, j, n;
954 int ret = 0; /* returned flags */
955
956 while ((c = e_getc(p_jpeg, -1)))
957 {
958 if (c != 0xFF) /* no marker? */
959 {
960 JDEBUGF("Non-marker data\n");
961 putc(p_jpeg);
962 break; /* exit marker processing */
963 }
964
965 c = e_getc(p_jpeg, -1);
966 JDEBUGF("marker value %X\n",c);
967 switch (c)
968 {
969 case 0xFF: /* Fill byte */
970 ret |= FILL_FF;
971 case 0x00: /* Zero stuffed byte - entropy data */
972 putc(p_jpeg);
973 continue;
974
975 case 0xC0: /* SOF Huff - Baseline DCT */
976 {
977 JDEBUGF("SOF marker ");
978 ret |= SOF0;
979 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
980 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
981 JDEBUGF("len: %d\n", marker_size);
982 n = e_getc(p_jpeg, -1); /* sample precision (= 8 or 12) */
983 if (n != 8)
984 {
985 return(-1); /* Unsupported sample precision */
986 }
987 p_jpeg->y_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
988 p_jpeg->y_size |= e_getc(p_jpeg, -1); /* Lowbyte */
989 p_jpeg->x_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
990 p_jpeg->x_size |= e_getc(p_jpeg, -1); /* Lowbyte */
991 JDEBUGF(" dimensions: %dx%d\n", p_jpeg->x_size,
992 p_jpeg->y_size);
993
994 n = (marker_size-2-6)/3;
995 if (e_getc(p_jpeg, -1) != n || (n != 1 && n != 3))
996 {
997 return(-2); /* Unsupported SOF0 component specification */
998 }
999 for (i=0; i<n; i++)
1000 {
1001 /* Component info */
1002 p_jpeg->frameheader[i].ID = e_getc(p_jpeg, -1);
1003 p_jpeg->frameheader[i].horizontal_sampling =
1004 (c = e_getc(p_jpeg, -1)) >> 4;
1005 p_jpeg->frameheader[i].vertical_sampling = c & 0x0F;
1006 p_jpeg->frameheader[i].quanttable_select =
1007 e_getc(p_jpeg, -1);
1008 if (p_jpeg->frameheader[i].horizontal_sampling > 2
1009 || p_jpeg->frameheader[i].vertical_sampling > 2)
1010 return -3; /* Unsupported SOF0 subsampling */
1011 }
1012 p_jpeg->blocks = n;
1013 }
1014 break;
1015
1016 case 0xC1: /* SOF Huff - Extended sequential DCT*/
1017 case 0xC2: /* SOF Huff - Progressive DCT*/
1018 case 0xC3: /* SOF Huff - Spatial (sequential) lossless*/
1019 case 0xC5: /* SOF Huff - Differential sequential DCT*/
1020 case 0xC6: /* SOF Huff - Differential progressive DCT*/
1021 case 0xC7: /* SOF Huff - Differential spatial*/
1022 case 0xC8: /* SOF Arith - Reserved for JPEG extensions*/
1023 case 0xC9: /* SOF Arith - Extended sequential DCT*/
1024 case 0xCA: /* SOF Arith - Progressive DCT*/
1025 case 0xCB: /* SOF Arith - Spatial (sequential) lossless*/
1026 case 0xCD: /* SOF Arith - Differential sequential DCT*/
1027 case 0xCE: /* SOF Arith - Differential progressive DCT*/
1028 case 0xCF: /* SOF Arith - Differential spatial*/
1029 {
1030 return (-4); /* other DCT model than baseline not implemented */
1031 }
1032
1033 case 0xC4: /* Define Huffman Table(s) */
1034 {
1035 ret |= DHT;
1036 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
1037 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
1038 marker_size -= 2;
1039
1040 while (marker_size > 17) /* another table */
1041 {
1042 c = e_getc(p_jpeg, -1);
1043 marker_size--;
1044 int sum = 0;
1045 i = c & 0x0F; /* table index */
1046 if (i > 1)
1047 {
1048 return (-5); /* Huffman table index out of range */
1049 } else {
1050 if (c & 0xF0) /* AC table */
1051 {
1052 for (j=0; j<16; j++)
1053 {
1054 p_jpeg->hufftable[i].huffmancodes_ac[j] =
1055 (c = e_getc(p_jpeg, -1));
1056 sum += c;
1057 marker_size -= 1;
1058 }
1059 if(16 + sum > AC_LEN)
1060 return -10; /* longer than allowed */
1061
1062 for (; j < 16 + sum; j++)
1063 {
1064 p_jpeg->hufftable[i].huffmancodes_ac[j] =
1065 e_getc(p_jpeg, -1);
1066 marker_size--;
1067 }
1068 }
1069 else /* DC table */
1070 {
1071 for (j=0; j<16; j++)
1072 {
1073 p_jpeg->hufftable[i].huffmancodes_dc[j] =
1074 (c = e_getc(p_jpeg, -1));
1075 sum += c;
1076 marker_size--;
1077 }
1078 if(16 + sum > DC_LEN)
1079 return -11; /* longer than allowed */
1080
1081 for (; j < 16 + sum; j++)
1082 {
1083 p_jpeg->hufftable[i].huffmancodes_dc[j] =
1084 e_getc(p_jpeg, -1);
1085 marker_size--;
1086 }
1087 }
1088 }
1089 } /* while */
1090 e_skip_bytes(p_jpeg, marker_size);
1091 }
1092 break;
1093
1094 case 0xCC: /* Define Arithmetic coding conditioning(s) */
1095 return(-6); /* Arithmetic coding not supported */
1096
1097 case 0xD8: /* Start of Image */
1098 JDEBUGF("SOI\n");
1099 break;
1100 case 0xD9: /* End of Image */
1101 JDEBUGF("EOI\n");
1102 break;
1103 case 0x01: /* for temp private use arith code */
1104 JDEBUGF("private\n");
1105 break; /* skip parameterless marker */
1106
1107
1108 case 0xDA: /* Start of Scan */
1109 {
1110 ret |= SOS;
1111 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
1112 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
1113 marker_size -= 2;
1114
1115 n = (marker_size-1-3)/2;
1116 if (e_getc(p_jpeg, -1) != n || (n != 1 && n != 3))
1117 {
1118 return (-7); /* Unsupported SOS component specification */
1119 }
1120 marker_size--;
1121 for (i=0; i<n; i++)
1122 {
1123 p_jpeg->scanheader[i].ID = e_getc(p_jpeg, -1);
1124 p_jpeg->scanheader[i].DC_select = (c = e_getc(p_jpeg, -1))
1125 >> 4;
1126 p_jpeg->scanheader[i].AC_select = c & 0x0F;
1127 marker_size -= 2;
1128 }
1129 /* skip spectral information */
1130 e_skip_bytes(p_jpeg, marker_size);
1131 }
1132 break;
1133
1134 case 0xDB: /* Define quantization Table(s) */
1135 {
1136 ret |= DQT;
1137 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
1138 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
1139 marker_size -= 2;
1140
1141 n = (marker_size)/(QUANT_TABLE_LENGTH+1); /* # of tables */
1142 for (i=0; i<n; i++)
1143 {
1144 int id = e_getc(p_jpeg, -1); /* ID */
1145 marker_size--;
1146 if (id >= 4)
1147 {
1148 return (-8); /* Unsupported quantization table */
1149 }
1150 /* Read Quantisation table: */
1151 for (j=0; j<QUANT_TABLE_LENGTH; j++)
1152 {
1153 p_jpeg->quanttable[id][j] = e_getc(p_jpeg, -1);
1154 marker_size--;
1155 }
1156 }
1157 e_skip_bytes(p_jpeg, marker_size);
1158 }
1159 break;
1160
1161 case 0xDD: /* Define Restart Interval */
1162 {
1163 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
1164 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
1165 marker_size -= 4;
1166 /* Highbyte */
1167 p_jpeg->restart_interval = e_getc(p_jpeg, -1) << 8;
1168 p_jpeg->restart_interval |= e_getc(p_jpeg, -1); /* Lowbyte */
1169 e_skip_bytes(p_jpeg, marker_size); /* skip segment */
1170 }
1171 break;
1172
1173 case 0xDC: /* Define Number of Lines */
1174 case 0xDE: /* Define Hierarchical progression */
1175 case 0xDF: /* Expand Reference Component(s) */
1176 case 0xE0: /* Application Field 0*/
1177 case 0xE1: /* Application Field 1*/
1178 case 0xE2: /* Application Field 2*/
1179 case 0xE3: /* Application Field 3*/
1180 case 0xE4: /* Application Field 4*/
1181 case 0xE5: /* Application Field 5*/
1182 case 0xE6: /* Application Field 6*/
1183 case 0xE7: /* Application Field 7*/
1184 case 0xE8: /* Application Field 8*/
1185 case 0xE9: /* Application Field 9*/
1186 case 0xEA: /* Application Field 10*/
1187 case 0xEB: /* Application Field 11*/
1188 case 0xEC: /* Application Field 12*/
1189 case 0xED: /* Application Field 13*/
1190 case 0xEE: /* Application Field 14*/
1191 case 0xEF: /* Application Field 15*/
1192 case 0xFE: /* Comment */
1193 {
1194 marker_size = e_getc(p_jpeg, -1) << 8; /* Highbyte */
1195 marker_size |= e_getc(p_jpeg, -1); /* Lowbyte */
1196 marker_size -= 2;
1197 JDEBUGF("unhandled marker len %d\n", marker_size);
1198 e_skip_bytes(p_jpeg, marker_size); /* skip segment */
1199 }
1200 break;
1201
1202 case 0xF0: /* Reserved for JPEG extensions */
1203 case 0xF1: /* Reserved for JPEG extensions */
1204 case 0xF2: /* Reserved for JPEG extensions */
1205 case 0xF3: /* Reserved for JPEG extensions */
1206 case 0xF4: /* Reserved for JPEG extensions */
1207 case 0xF5: /* Reserved for JPEG extensions */
1208 case 0xF6: /* Reserved for JPEG extensions */
1209 case 0xF7: /* Reserved for JPEG extensions */
1210 case 0xF8: /* Reserved for JPEG extensions */
1211 case 0xF9: /* Reserved for JPEG extensions */
1212 case 0xFA: /* Reserved for JPEG extensions */
1213 case 0xFB: /* Reserved for JPEG extensions */
1214 case 0xFC: /* Reserved for JPEG extensions */
1215 case 0xFD: /* Reserved for JPEG extensions */
1216 case 0x02: /* Reserved */
1217 default:
1218 return (-9); /* Unknown marker */
1219 } /* switch */
1220 } /* while */
1221
1222 return (ret); /* return flags with seen markers */
1223 }
1224
1225 static const struct huffman_table luma_table =
1226 {
1227 {
1228 0x00,0x01,0x05,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
1229 0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B
1230 },
1231 {
1232 0x00,0x02,0x01,0x03,0x03,0x02,0x04,0x03,0x05,0x05,0x04,0x04,0x00,0x00,
1233 0x01,0x7D,0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,
1234 0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xA1,0x08,0x23,0x42,
1235 0xB1,0xC1,0x15,0x52,0xD1,0xF0,0x24,0x33,0x62,0x72,0x82,0x09,0x0A,0x16,
1236 0x17,0x18,0x19,0x1A,0x25,0x26,0x27,0x28,0x29,0x2A,0x34,0x35,0x36,0x37,
1237 0x38,0x39,0x3A,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x53,0x54,0x55,
1238 0x56,0x57,0x58,0x59,0x5A,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x73,
1239 0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
1240 0x8A,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0xA2,0xA3,0xA4,0xA5,
1241 0xA6,0xA7,0xA8,0xA9,0xAA,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,
1242 0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xD2,0xD3,0xD4,0xD5,0xD6,
1243 0xD7,0xD8,0xD9,0xDA,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,
1244 0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA
1245 }
1246 };
1247
1248 static const struct huffman_table chroma_table =
1249 {
1250 {
1251 0x00,0x03,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,
1252 0x00,0x00,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B
1253 },
1254 {
1255 0x00,0x02,0x01,0x02,0x04,0x04,0x03,0x04,0x07,0x05,0x04,0x04,0x00,0x01,
1256 0x02,0x77,0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,
1257 0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,0xA1,0xB1,
1258 0xC1,0x09,0x23,0x33,0x52,0xF0,0x15,0x62,0x72,0xD1,0x0A,0x16,0x24,0x34,
1259 0xE1,0x25,0xF1,0x17,0x18,0x19,0x1A,0x26,0x27,0x28,0x29,0x2A,0x35,0x36,
1260 0x37,0x38,0x39,0x3A,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x53,0x54,
1261 0x55,0x56,0x57,0x58,0x59,0x5A,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
1262 0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x82,0x83,0x84,0x85,0x86,0x87,
1263 0x88,0x89,0x8A,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0xA2,0xA3,
1264 0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,
1265 0xB9,0xBA,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xD2,0xD3,0xD4,
1266 0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,
1267 0xEA,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA
1268 }
1269 };
1270
1271 static void default_huff_tbl(struct jpeg* p_jpeg)
1272 {
1273
1274 MEMCPY(&p_jpeg->hufftable[0], &luma_table, sizeof(luma_table));
1275 MEMCPY(&p_jpeg->hufftable[1], &chroma_table, sizeof(chroma_table));
1276
1277 return;
1278 }
1279
1280 /* Compute the derived values for a Huffman table */
1281 static void fix_huff_tbl(int* htbl, struct derived_tbl* dtbl)
1282 {
1283 int p, i, l, si;
1284 int lookbits, ctr;
1285 char huffsize[257];
1286 unsigned int huffcode[257];
1287 unsigned int code;
1288
1289 dtbl->pub = htbl; /* fill in back link */
1290
1291 /* Figure C.1: make table of Huffman code length for each symbol */
1292 /* Note that this is in code-length order. */
1293
1294 p = 0;
1295 for (l = 1; l <= 16; l++)
1296 { /* all possible code length */
1297 for (i = 1; i <= (int) htbl[l-1]; i++) /* all codes per length */
1298 huffsize[p++] = (char) l;
1299 }
1300 huffsize[p] = 0;
1301
1302 /* Figure C.2: generate the codes themselves */
1303 /* Note that this is in code-length order. */
1304
1305 code = 0;
1306 si = huffsize[0];
1307 p = 0;
1308 while (huffsize[p])
1309 {
1310 while (((int) huffsize[p]) == si)
1311 {
1312 huffcode[p++] = code;
1313 code++;
1314 }
1315 code <<= 1;
1316 si++;
1317 }
1318
1319 /* Figure F.15: generate decoding tables for bit-sequential decoding */
1320
1321 p = 0;
1322 for (l = 1; l <= 16; l++)
1323 {
1324 if (htbl[l-1])
1325 {
1326 /* huffval[] index of 1st symbol of code length l */
1327 dtbl->valptr[l] = p;
1328 dtbl->mincode[l] = huffcode[p]; /* minimum code of length l */
1329 p += htbl[l-1];
1330 dtbl->maxcode[l] = huffcode[p-1]; /* maximum code of length l */
1331 }
1332 else
1333 {
1334 dtbl->maxcode[l] = -1; /* -1 if no codes of this length */
1335 }
1336 }
1337 dtbl->maxcode[17] = 0xFFFFFL; /* ensures huff_DECODE terminates */
1338
1339 /* Compute lookahead tables to speed up decoding.
1340 * First we set all the table entries to 0, indicating "too long";
1341 * then we iterate through the Huffman codes that are short enough and
1342 * fill in all the entries that correspond to bit sequences starting
1343 * with that code.
1344 */
1345
1346 MEMSET(dtbl->look_nbits, 0, sizeof(dtbl->look_nbits));
1347
1348 p = 0;
1349 for (l = 1; l <= HUFF_LOOKAHEAD; l++)
1350 {
1351 for (i = 1; i <= (int) htbl[l-1]; i++, p++)
1352 {
1353 /* l = current code's length, p = its index in huffcode[] &
1354 * huffval[]. Generate left-justified code followed by all possible
1355 * bit sequences
1356 */
1357 lookbits = huffcode[p] << (HUFF_LOOKAHEAD-l);
1358 for (ctr = 1 << (HUFF_LOOKAHEAD-l); ctr > 0; ctr--)
1359 {
1360 dtbl->look_nbits[lookbits] = l;
1361 dtbl->look_sym[lookbits] = htbl[16+p];
1362 lookbits++;
1363 }
1364 }
1365 }
1366 }
1367
1368
1369 /* zag[i] is the natural-order position of the i'th element of zigzag order. */
1370 static const unsigned char zag[] =
1371 {
1372 #ifdef JPEG_IDCT_TRANSPOSE
1373 0, 8, 1, 2, 9, 16, 24, 17,
1374 10, 3, 4, 11, 18, 25, 32, 40,
1375 33, 26, 19, 12, 5, 6, 13, 20,
1376 27, 34, 41, 48, 56, 49, 42, 35,
1377 28, 21, 14, 7, 15, 22, 29, 36,
1378 43, 50, 57, 58, 51, 44, 37, 30,
1379 23, 31, 38, 45, 52, 59, 60, 53,
1380 46, 39, 47, 54, 61, 62, 55, 63,
1381 #endif
1382 0, 1, 8, 16, 9, 2, 3, 10,
1383 17, 24, 32, 25, 18, 11, 4, 5,
1384 12, 19, 26, 33, 40, 48, 41, 34,
1385 27, 20, 13, 6, 7, 14, 21, 28,
1386 35, 42, 49, 56, 57, 50, 43, 36,
1387 29, 22, 15, 23, 30, 37, 44, 51,
1388 58, 59, 52, 45, 38, 31, 39, 46,
1389 53, 60, 61, 54, 47, 55, 62, 63,
1390 };
1391
1392 /* zig[i] is the the zig-zag order position of the i'th element of natural
1393 * order, reading left-to-right then top-to-bottom.
1394 */
1395 static const unsigned char zig[] =
1396 {
1397 0, 1, 5, 6, 14, 15, 27, 28,
1398 2, 4, 7, 13, 16, 26, 29, 42,
1399 3, 8, 12, 17, 25, 30, 41, 43,
1400 9, 11, 18, 24, 31, 40, 44, 53,
1401 10, 19, 23, 32, 39, 45, 52, 54,
1402 20, 22, 33, 38, 46, 51, 55, 60,
1403 21, 34, 37, 47, 50, 56, 59, 61,
1404 35, 36, 48, 49, 57, 58, 62, 63
1405 };
1406
1407 /* Reformat some image header data so that the decoder can use it properly. */
1408 INLINE void fix_headers(struct jpeg* p_jpeg)
1409 {
1410 int i;
1411
1412 for (i=0; i<4; i++)
1413 p_jpeg->store_pos[i] = i; /* default ordering */
1414
1415 /* assignments for the decoding of blocks */
1416 if (p_jpeg->frameheader[0].horizontal_sampling == 2
1417 && p_jpeg->frameheader[0].vertical_sampling == 1)
1418 { /* 4:2:2 */
1419 p_jpeg->blocks = 4;
1420 p_jpeg->x_mbl = (p_jpeg->x_size+15) / 16;
1421 p_jpeg->x_phys = p_jpeg->x_mbl * 16;
1422 p_jpeg->y_mbl = (p_jpeg->y_size+7) / 8;
1423 p_jpeg->y_phys = p_jpeg->y_mbl * 8;
1424 p_jpeg->mcu_membership[0] = 0; /* Y1=Y2=0, U=1, V=2 */
1425 p_jpeg->mcu_membership[1] = 0;
1426 p_jpeg->mcu_membership[2] = 1;
1427 p_jpeg->mcu_membership[3] = 2;
1428 p_jpeg->tab_membership[0] = 0; /* DC, DC, AC, AC */
1429 p_jpeg->tab_membership[1] = 0;
1430 p_jpeg->tab_membership[2] = 1;
1431 p_jpeg->tab_membership[3] = 1;
1432 p_jpeg->subsample_x[0] = 1;
1433 p_jpeg->subsample_x[1] = 2;
1434 p_jpeg->subsample_x[2] = 2;
1435 p_jpeg->subsample_y[0] = 1;
1436 p_jpeg->subsample_y[1] = 1;
1437 p_jpeg->subsample_y[2] = 1;
1438 }
1439 if (p_jpeg->frameheader[0].horizontal_sampling == 1
1440 && p_jpeg->frameheader[0].vertical_sampling == 2)
1441 { /* 4:2:2 vertically subsampled */
1442 p_jpeg->store_pos[1] = 2; /* block positions are mirrored */
1443 p_jpeg->store_pos[2] = 1;
1444 p_jpeg->blocks = 4;
1445 p_jpeg->x_mbl = (p_jpeg->x_size+7) / 8;
1446 p_jpeg->x_phys = p_jpeg->x_mbl * 8;
1447 p_jpeg->y_mbl = (p_jpeg->y_size+15) / 16;
1448 p_jpeg->y_phys = p_jpeg->y_mbl * 16;
1449 p_jpeg->mcu_membership[0] = 0; /* Y1=Y2=0, U=1, V=2 */
1450 p_jpeg->mcu_membership[1] = 0;
1451 p_jpeg->mcu_membership[2] = 1;
1452 p_jpeg->mcu_membership[3] = 2;
1453 p_jpeg->tab_membership[0] = 0; /* DC, DC, AC, AC */
1454 p_jpeg->tab_membership[1] = 0;
1455 p_jpeg->tab_membership[2] = 1;
1456 p_jpeg->tab_membership[3] = 1;
1457 p_jpeg->subsample_x[0] = 1;
1458 p_jpeg->subsample_x[1] = 1;
1459 p_jpeg->subsample_x[2] = 1;
1460 p_jpeg->subsample_y[0] = 1;
1461 p_jpeg->subsample_y[1] = 2;
1462 p_jpeg->subsample_y[2] = 2;
1463 }
1464 else if (p_jpeg->frameheader[0].horizontal_sampling == 2
1465 && p_jpeg->frameheader[0].vertical_sampling == 2)
1466 { /* 4:2:0 */
1467 p_jpeg->blocks = 6;
1468 p_jpeg->x_mbl = (p_jpeg->x_size+15) / 16;
1469 p_jpeg->x_phys = p_jpeg->x_mbl * 16;
1470 p_jpeg->y_mbl = (p_jpeg->y_size+15) / 16;
1471 p_jpeg->y_phys = p_jpeg->y_mbl * 16;
1472 p_jpeg->mcu_membership[0] = 0;
1473 p_jpeg->mcu_membership[1] = 0;
1474 p_jpeg->mcu_membership[2] = 0;
1475 p_jpeg->mcu_membership[3] = 0;
1476 p_jpeg->mcu_membership[4] = 1;
1477 p_jpeg->mcu_membership[5] = 2;
1478 p_jpeg->tab_membership[0] = 0;
1479 p_jpeg->tab_membership[1] = 0;
1480 p_jpeg->tab_membership[2] = 0;
1481 p_jpeg->tab_membership[3] = 0;
1482 p_jpeg->tab_membership[4] = 1;
1483 p_jpeg->tab_membership[5] = 1;
1484 p_jpeg->subsample_x[0] = 1;
1485 p_jpeg->subsample_x[1] = 2;
1486 p_jpeg->subsample_x[2] = 2;
1487 p_jpeg->subsample_y[0] = 1;
1488 p_jpeg->subsample_y[1] = 2;
1489 p_jpeg->subsample_y[2] = 2;
1490 }
1491 else if (p_jpeg->frameheader[0].horizontal_sampling == 1
1492 && p_jpeg->frameheader[0].vertical_sampling == 1)
1493 { /* 4:4:4 */
1494 /* don't overwrite p_jpeg->blocks */
1495 p_jpeg->x_mbl = (p_jpeg->x_size+7) / 8;
1496 p_jpeg->x_phys = p_jpeg->x_mbl * 8;
1497 p_jpeg->y_mbl = (p_jpeg->y_size+7) / 8;
1498 p_jpeg->y_phys = p_jpeg->y_mbl * 8;
1499 p_jpeg->mcu_membership[0] = 0;
1500 p_jpeg->mcu_membership[1] = 1;
1501 p_jpeg->mcu_membership[2] = 2;
1502 p_jpeg->tab_membership[0] = 0;
1503 p_jpeg->tab_membership[1] = 1;
1504 p_jpeg->tab_membership[2] = 1;
1505 p_jpeg->subsample_x[0] = 1;
1506 p_jpeg->subsample_x[1] = 1;
1507 p_jpeg->subsample_x[2] = 1;
1508 p_jpeg->subsample_y[0] = 1;
1509 p_jpeg->subsample_y[1] = 1;
1510 p_jpeg->subsample_y[2] = 1;
1511 }
1512 else
1513 {
1514 /* error */
1515 }
1516
1517 }
1518
1519 INLINE void fix_huff_tables(struct jpeg *p_jpeg)
1520 {
1521 fix_huff_tbl(p_jpeg->hufftable[0].huffmancodes_dc,
1522 &p_jpeg->dc_derived_tbls[0]);
1523 fix_huff_tbl(p_jpeg->hufftable[0].huffmancodes_ac,
1524 &p_jpeg->ac_derived_tbls[0]);
1525 fix_huff_tbl(p_jpeg->hufftable[1].huffmancodes_dc,
1526 &p_jpeg->dc_derived_tbls[1]);
1527 fix_huff_tbl(p_jpeg->hufftable[1].huffmancodes_ac,
1528 &p_jpeg->ac_derived_tbls[1]);
1529 }
1530
1531 /* Because some of the IDCT routines never multiply by any constants, and
1532 * therefore do not produce shifted output, we add the shift into the
1533 * quantization table when one of these IDCT routines is used, rather than
1534 * have the IDCT shift each value it processes.
1535 */
1536 INLINE void fix_quant_tables(struct jpeg *p_jpeg)
1537 {
1538 int shift, i, j;
1539 for (i = 0; i < 2; i++)
1540 {
1541 shift = idct_tbl[p_jpeg->v_scale[i]].scale;
1542 if (shift)
1543 {
1544 for (j = 0; j < 64; j++)
1545 p_jpeg->quanttable[i][j] <<= shift;
1546 }
1547 }
1548 }
1549
1550 /*
1551 * These functions/macros provide the in-line portion of bit fetching.
1552 * Use check_bit_buffer to ensure there are N bits in get_buffer
1553 * before using get_bits, peek_bits, or drop_bits.
1554 * check_bit_buffer(state,n,action);
1555 * Ensure there are N bits in get_buffer; if suspend, take action.
1556 * val = get_bits(n);
1557 * Fetch next N bits.
1558 * val = peek_bits(n);
1559 * Fetch next N bits without removing them from the buffer.
1560 * drop_bits(n);
1561 * Discard next N bits.
1562 * The value N should be a simple variable, not an expression, because it
1563 * is evaluated multiple times.
1564 */
1565
1566 static void fill_bit_buffer(struct jpeg* p_jpeg)
1567 {
1568 unsigned char byte, marker;
1569
1570 if (p_jpeg->marker_val)
1571 p_jpeg->marker_ind += 16;
1572 byte = d_getc(p_jpeg, 0);
1573 if (UNLIKELY(byte == 0xFF)) /* legal marker can be byte stuffing or RSTm */
1574 { /* simplification: just skip the (one-byte) marker code */
1575 marker = d_getc(p_jpeg, 0);
1576 if ((marker & ~7) == 0xD0)
1577 {
1578 p_jpeg->marker_val = marker;
1579 p_jpeg->marker_ind = 8;
1580 }
1581 }
1582 p_jpeg->bitbuf = (p_jpeg->bitbuf << 8) | byte;
1583
1584 byte = d_getc(p_jpeg, 0);
1585 if (UNLIKELY(byte == 0xFF)) /* legal marker can be byte stuffing or RSTm */
1586 { /* simplification: just skip the (one-byte) marker code */
1587 marker = d_getc(p_jpeg, 0);
1588 if ((marker & ~7) == 0xD0)
1589 {
1590 p_jpeg->marker_val = marker;
1591 p_jpeg->marker_ind = 0;
1592 }
1593 }
1594 p_jpeg->bitbuf = (p_jpeg->bitbuf << 8) | byte;
1595 p_jpeg->bitbuf_bits += 16;
1596 #ifdef JPEG_BS_DEBUG
1597 DEBUGF("read in: %04X\n", p_jpeg->bitbuf & 0xFFFF);
1598 #endif
1599 }
1600
1601 INLINE void check_bit_buffer(struct jpeg *p_jpeg, int nbits)
1602 {
1603 if (nbits > p_jpeg->bitbuf_bits)
1604 fill_bit_buffer(p_jpeg);
1605 }
1606
1607 INLINE int get_bits(struct jpeg *p_jpeg, int nbits)
1608 {
1609 #ifdef JPEG_BS_DEBUG
1610 if (nbits > p_jpeg->bitbuf_bits)
1611 DEBUGF("bitbuffer underrun\n");
1612 int mask = BIT_N(p_jpeg->bitbuf_bits - 1);
1613 int i;
1614 DEBUGF("get %d bits: ", nbits);
1615 for (i = 0; i < nbits; i++)
1616 DEBUGF("%d",!!(p_jpeg->bitbuf & (mask >>= 1)));
1617 DEBUGF("\n");
1618 #endif
1619 return ((int) (p_jpeg->bitbuf >> (p_jpeg->bitbuf_bits -= nbits))) &
1620 (BIT_N(nbits)-1);
1621 }
1622
1623 INLINE int peek_bits(struct jpeg *p_jpeg, int nbits)
1624 {
1625 #ifdef JPEG_BS_DEBUG
1626 int mask = BIT_N(p_jpeg->bitbuf_bits - 1);
1627 int i;
1628 DEBUGF("peek %d bits: ", nbits);
1629 for (i = 0; i < nbits; i++)
1630 DEBUGF("%d",!!(p_jpeg->bitbuf & (mask >>= 1)));
1631 DEBUGF("\n");
1632 #endif
1633 return ((int) (p_jpeg->bitbuf >> (p_jpeg->bitbuf_bits - nbits))) &
1634 (BIT_N(nbits)-1);
1635 }
1636
1637 INLINE void drop_bits(struct jpeg *p_jpeg, int nbits)
1638 {
1639 #ifdef JPEG_BS_DEBUG
1640 int mask = BIT_N(p_jpeg->bitbuf_bits - 1);
1641 int i;
1642 DEBUGF("drop %d bits: ", nbits);
1643 for (i = 0; i < nbits; i++)
1644 DEBUGF("%d",!!(p_jpeg->bitbuf & (mask >>= 1)));
1645 DEBUGF("\n");
1646 #endif
1647 p_jpeg->bitbuf_bits -= nbits;
1648 }
1649
1650 /* re-synchronize to entropy data (skip restart marker) */
1651 static void search_restart(struct jpeg *p_jpeg)
1652 {
1653 if (p_jpeg->marker_val)
1654 {
1655 p_jpeg->marker_val = 0;
1656 p_jpeg->bitbuf_bits = p_jpeg->marker_ind;
1657 p_jpeg->marker_ind = 0;
1658 return;
1659 }
1660 unsigned char byte;
1661 p_jpeg->bitbuf_bits = 0;
1662 while ((byte = d_getc(p_jpeg, 0xFF)))
1663 {
1664 if (byte == 0xff)
1665 {
1666 byte = d_getc(p_jpeg, 0xD0);
1667 if ((byte & ~7) == 0xD0)
1668 {
1669 return;
1670 }
1671 else
1672 putc(p_jpeg);
1673 }
1674 }
1675 }
1676
1677 /* Figure F.12: extend sign bit. */
1678 #if CONFIG_CPU == SH7034
1679 /* SH1 lacks a variable-shift instruction */
1680 #define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
1681
1682 static const int extend_test[16] = /* entry n is 2**(n-1) */
1683 {
1684 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
1685 0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000
1686 };
1687
1688 static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
1689 {
1690 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
1691 ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
1692 ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
1693 ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1
1694 };
1695 #else
1696 /* This saves some code and data size, benchmarks about the same on RAM */
1697 #define HUFF_EXTEND(x,s) \
1698 ({ \
1699 int x__ = x; \
1700 int s__ = s; \
1701 x__ & BIT_N(s__- 1) ? x__ : x__ + (-1 << s__) + 1; \
1702 })
1703 #endif
1704
1705 /* Decode a single value */
1706 #define huff_decode_dc(p_jpeg, tbl, s, r) \
1707 { \
1708 int nb, look; \
1709 \
1710 check_bit_buffer((p_jpeg), HUFF_LOOKAHEAD); \
1711 look = peek_bits((p_jpeg), HUFF_LOOKAHEAD); \
1712 if ((nb = (tbl)->look_nbits[look]) != 0) \
1713 { \
1714 drop_bits((p_jpeg), nb); \
1715 s = (tbl)->look_sym[look]; \
1716 check_bit_buffer((p_jpeg), s); \
1717 r = get_bits((p_jpeg), s); \
1718 } else { \
1719 /* slow_DECODE(s, HUFF_LOOKAHEAD+1)) < 0); */ \
1720 long code; \
1721 nb=HUFF_LOOKAHEAD+1; \
1722 check_bit_buffer((p_jpeg), nb); \
1723 code = get_bits((p_jpeg), nb); \
1724 while (code > (tbl)->maxcode[nb]) \
1725 { \
1726 code <<= 1; \
1727 check_bit_buffer((p_jpeg), 1); \
1728 code |= get_bits((p_jpeg), 1); \
1729 nb++; \
1730 } \
1731 if (nb > 16) /* error in Huffman */ \
1732 { \
1733 r = 0; s = 0; /* fake a zero, this is most safe */ \
1734 } else { \
1735 s = (tbl)->pub[16 + (tbl)->valptr[nb] + \
1736 ((int) (code - (tbl)->mincode[nb]))]; \
1737 check_bit_buffer((p_jpeg), s); \
1738 r = get_bits((p_jpeg), s); \
1739 } \
1740 } /* end slow decode */ \
1741 }
1742
1743 #define huff_decode_ac(p_jpeg, tbl, s) \
1744 { \
1745 int nb, look; \
1746 \
1747 check_bit_buffer((p_jpeg), HUFF_LOOKAHEAD); \
1748 look = peek_bits((p_jpeg), HUFF_LOOKAHEAD); \
1749 if ((nb = (tbl)->look_nbits[look]) != 0) \
1750 { \
1751 drop_bits((p_jpeg), nb); \
1752 s = (tbl)->look_sym[look]; \
1753 } else { \
1754 /* slow_DECODE(s, HUFF_LOOKAHEAD+1)) < 0); */ \
1755 long code; \
1756 nb=HUFF_LOOKAHEAD+1; \
1757 check_bit_buffer((p_jpeg), nb); \
1758 code = get_bits((p_jpeg), nb); \
1759 while (code > (tbl)->maxcode[nb]) \
1760 { \
1761 code <<= 1; \
1762 check_bit_buffer((p_jpeg), 1); \
1763 code |= get_bits((p_jpeg), 1); \
1764 nb++; \
1765 } \
1766 if (nb > 16) /* error in Huffman */ \
1767 { \
1768 s = 0; /* fake a zero, this is most safe */ \
1769 } else { \
1770 s = (tbl)->pub[16 + (tbl)->valptr[nb] + \
1771 ((int) (code - (tbl)->mincode[nb]))]; \
1772 } \
1773 } /* end slow decode */ \
1774 }
1775
1776 static struct img_part *store_row_jpeg(void *jpeg_args)
1777 {
1778 struct jpeg *p_jpeg = (struct jpeg*) jpeg_args;
1779 #ifdef HAVE_LCD_COLOR
1780 int mcu_hscale = p_jpeg->h_scale[1];
1781 int mcu_vscale = p_jpeg->v_scale[1];
1782 #else
1783 int mcu_hscale = (p_jpeg->h_scale[0] +
1784 p_jpeg->frameheader[0].horizontal_sampling - 1);
1785 int mcu_vscale = (p_jpeg->v_scale[0] +
1786 p_jpeg->frameheader[0].vertical_sampling - 1);
1787 #endif
1788 unsigned int width = p_jpeg->x_mbl << mcu_hscale;
1789 unsigned int b_width = width * JPEG_PIX_SZ;
1790 int height = BIT_N(mcu_vscale);
1791 int x;
1792 if (!p_jpeg->mcu_row) /* Need to decode a new row of MCUs */
1793 {
1794 p_jpeg->out_ptr = (unsigned char *)p_jpeg->img_buf;
1795 int store_offs[4];
1796 #ifdef HAVE_LCD_COLOR
1797 unsigned mcu_width = BIT_N(mcu_hscale);
1798 #endif
1799 int mcu_offset = JPEG_PIX_SZ << mcu_hscale;
1800 unsigned char *out = p_jpeg->out_ptr;
1801 store_offs[p_jpeg->store_pos[0]] = 0;
1802 store_offs[p_jpeg->store_pos[1]] = JPEG_PIX_SZ << p_jpeg->h_scale[0];
1803 store_offs[p_jpeg->store_pos[2]] = b_width << p_jpeg->v_scale[0];
1804 store_offs[p_jpeg->store_pos[3]] = store_offs[1] + store_offs[2];
1805 /* decoded DCT coefficients */
1806 int16_t block[IDCT_WS_SIZE] __attribute__((aligned(8)));
1807 for (x = 0; x < p_jpeg->x_mbl; x++)
1808 {
1809 int blkn;
1810 for (blkn = 0; blkn < p_jpeg->blocks; blkn++)
1811 {
1812 int ci = p_jpeg->mcu_membership[blkn]; /* component index */
1813 int ti = p_jpeg->tab_membership[blkn]; /* table index */
1814 #ifdef JPEG_IDCT_TRANSPOSE
1815 bool transpose = p_jpeg->v_scale[!!ci] > 2;
1816 #endif
1817 int k = 1; /* coefficient index */
1818 int s, r; /* huffman values */
1819 struct derived_tbl* dctbl = &p_jpeg->dc_derived_tbls[ti];
1820 struct derived_tbl* actbl = &p_jpeg->ac_derived_tbls[ti];
1821
1822 /* Section F.2.2.1: decode the DC coefficient difference */
1823 huff_decode_dc(p_jpeg, dctbl, s, r);
1824
1825 #ifndef HAVE_LCD_COLOR
1826 if (!ci)
1827 #endif
1828 {
1829 s = HUFF_EXTEND(r, s);
1830 #ifdef HAVE_LCD_COLOR
1831 p_jpeg->last_dc_val[ci] += s;
1832 /* output it (assumes zag[0] = 0) */
1833 block[0] = MULTIPLY16(p_jpeg->last_dc_val[ci],
1834 p_jpeg->quanttable[!!ci][0]);
1835 #else
1836 p_jpeg->last_dc_val += s;
1837 /* output it (assumes zag[0] = 0) */
1838 block[0] = MULTIPLY16(p_jpeg->last_dc_val,
1839 p_jpeg->quanttable[0][0]);
1840 #endif
1841 /* coefficient buffer must be cleared */
1842 MEMSET(block+1, 0, p_jpeg->zero_need[!!ci] * sizeof(int));
1843 /* Section F.2.2.2: decode the AC coefficients */
1844 while(true)
1845 {
1846 huff_decode_ac(p_jpeg, actbl, s);
1847 r = s >> 4;
1848 s &= 15;
1849 k += r;
1850 if (s)
1851 {
1852 check_bit_buffer(p_jpeg, s);
1853 if (k >= p_jpeg->k_need[!!ci])
1854 goto skip_rest;
1855 r = get_bits(p_jpeg, s);
1856 r = HUFF_EXTEND(r, s);
1857 r = MULTIPLY16(r, p_jpeg->quanttable[!!ci][k]);
1858 #ifdef JPEG_IDCT_TRANSPOSE
1859 block[zag[transpose ? k : k + 64]] = r ;
1860 #else
1861 block[zag[k]] = r ;
1862 #endif
1863 }
1864 else
1865 {
1866 if (r != 15)
1867 goto block_end;
1868 }
1869 if ((++k) & 64)
1870 goto block_end;
1871 } /* for k */
1872 }
1873 for (; k < 64; k++)
1874 {
1875 huff_decode_ac(p_jpeg, actbl, s);
1876 r = s >> 4;
1877 s &= 15;
1878
1879 if (s)
1880 {
1881 k += r;
1882 check_bit_buffer(p_jpeg, s);
1883 skip_rest:
1884 drop_bits(p_jpeg, s);
1885 }
1886 else
1887 {
1888 if (r != 15)
1889 break;
1890 k += r;
1891 }
1892 } /* for k */
1893 block_end:
1894 #ifndef HAVE_LCD_COLOR
1895 if (!ci)
1896 #endif
1897 {
1898 int idct_cols = BIT_N(MIN(p_jpeg->h_scale[!!ci], 3));
1899 int idct_rows = BIT_N(p_jpeg->v_scale[!!ci]);
1900 unsigned char *b_out = out + (ci ? ci : store_offs[blkn]);
1901 if (idct_tbl[p_jpeg->v_scale[!!ci]].v_idct)
1902 #ifdef JPEG_IDCT_TRANSPOSE
1903 idct_tbl[p_jpeg->v_scale[!!ci]].v_idct(block,
1904 transpose ? block + 8 * idct_cols
1905 : block + idct_cols);
1906 uint16_t * h_block = transpose ? block + 64 : block;
1907 idct_tbl[p_jpeg->h_scale[!!ci]].h_idct(h_block, b_out,
1908 h_block + idct_rows * 8, b_width);
1909 #else
1910 idct_tbl[p_jpeg->v_scale[!!ci]].v_idct(block,
1911 block + idct_cols);
1912 idct_tbl[p_jpeg->h_scale[!!ci]].h_idct(block, b_out,
1913 block + idct_rows * 8, b_width);
1914 #endif
1915 }
1916 } /* for blkn */
1917 /* don't starve other threads while an MCU row decodes */
1918 yield();
1919 #ifdef HAVE_LCD_COLOR
1920 unsigned int xp;
1921 int yp;
1922 unsigned char *row = out;
1923 if (p_jpeg->blocks == 1)
1924 {
1925 for (yp = 0; yp < height; yp++, row += b_width)
1926 {
1927 unsigned char *px = row;
1928 for (xp = 0; xp < mcu_width; xp++, px += JPEG_PIX_SZ)
1929 {
1930 px[1] = px[2] = px[0];
1931 }
1932 }
1933 }
1934 #endif
1935 out += mcu_offset;
1936 if (p_jpeg->restart_interval && --p_jpeg->restart == 0)
1937 { /* if a restart marker is due: */
1938 p_jpeg->restart = p_jpeg->restart_interval; /* count again */
1939 search_restart(p_jpeg); /* align the bitstream */
1940 #ifdef HAVE_LCD_COLOR
1941 p_jpeg->last_dc_val[0] = p_jpeg->last_dc_val[1] =
1942 p_jpeg->last_dc_val[2] = 0; /* reset decoder */
1943 #else
1944 p_jpeg->last_dc_val = 0;
1945 #endif
1946 }
1947 }
1948 } /* if !p_jpeg->mcu_row */
1949 p_jpeg->mcu_row = (p_jpeg->mcu_row + 1) & (height - 1);
1950 p_jpeg->part.len = width;
1951 p_jpeg->part.buf = (jpeg_pix_t *)p_jpeg->out_ptr;
1952 p_jpeg->out_ptr += b_width;
1953 return &(p_jpeg->part);
1954 }
1955
1956 /******************************************************************************
1957 * read_jpeg_file()
1958 *
1959 * Reads a JPEG file and puts the data in rockbox format in *bitmap.
1960 *
1961 *****************************************************************************/
1962 #ifndef JPEG_FROM_MEM
1963 int read_jpeg_file(const char* filename,
1964 struct bitmap *bm,
1965 int maxsize,
1966 int format,
1967 const struct custom_format *cformat)
1968 {
1969 int fd, ret;
1970 fd = open(filename, O_RDONLY);
1971 JDEBUGF("read_jpeg_file: filename: %s buffer len: %d cformat: %p\n",
1972 filename, maxsize, cformat);
1973 /* Exit if file opening failed */
1974 if (fd < 0) {
1975 DEBUGF("read_jpeg_file: can't open '%s', rc: %d\n", filename, fd);
1976 return fd * 10 - 1;
1977 }
1978
1979 ret = read_jpeg_fd(fd, bm, maxsize, format, cformat);
1980 close(fd);
1981 return ret;
1982 }
1983 #endif
1984
1985 static int calc_scale(int in_size, int out_size)
1986 {
1987 int scale = 0;
1988 out_size <<= 3;
1989 for (scale = 0; scale < 3; scale++)
1990 {
1991 if (out_size <= in_size)
1992 break;
1993 else
1994 in_size <<= 1;
1995 }
1996 return scale;
1997 }
1998
1999 #ifdef JPEG_FROM_MEM
2000 int get_jpeg_dim_mem(unsigned char *data, unsigned long len,
2001 struct dim *size)
2002 {
2003 struct jpeg *p_jpeg = &jpeg;
2004 memset(p_jpeg, 0, sizeof(struct jpeg));
2005 p_jpeg->data = data;
2006 p_jpeg->len = len;
2007 int status = process_markers(p_jpeg);
2008 if (status < 0)
2009 return status;
2010 if ((status & (DQT | SOF0)) != (DQT | SOF0))
2011 return -(status * 16);
2012 size->width = p_jpeg->x_size;
2013 size->height = p_jpeg->y_size;
2014 return 0;
2015 }
2016
2017 int decode_jpeg_mem(unsigned char *data, unsigned long len,
2018 #else
2019 int read_jpeg_fd(int fd,
2020 #endif
2021 struct bitmap *bm,
2022 int maxsize,
2023 int format,
2024 const struct custom_format *cformat)
2025 {
2026 bool resize = false, dither = false;
2027 struct rowset rset;
2028 struct dim src_dim;
2029 int status;
2030 int bm_size;
2031 #ifdef JPEG_FROM_MEM
2032 struct jpeg *p_jpeg = &jpeg;
2033 #else
2034 struct jpeg *p_jpeg = (struct jpeg*)bm->data;
2035 int tmp_size = maxsize;
2036 ALIGN_BUFFER(p_jpeg, tmp_size, sizeof(int));
2037 /* not enough memory for our struct jpeg */
2038 if ((size_t)tmp_size < sizeof(struct jpeg))
2039 return -1;
2040 #endif
2041 memset(p_jpeg, 0, sizeof(struct jpeg));
2042 #ifdef JPEG_FROM_MEM
2043 p_jpeg->data = data;
2044 p_jpeg->len = len;
2045 #else
2046 p_jpeg->fd = fd;
2047 #endif
2048 status = process_markers(p_jpeg);
2049 #ifndef JPEG_FROM_MEM
2050 JDEBUGF("position in file: %d buffer fill: %d\n",
2051 (int)lseek(p_jpeg->fd, 0, SEEK_CUR), p_jpeg->buf_left);
2052 #endif
2053 if (status < 0)
2054 return status;
2055 if ((status & (DQT | SOF0)) != (DQT | SOF0))
2056 return -(status * 16);
2057 if (!(status & DHT)) /* if no Huffman table present: */
2058 default_huff_tbl(p_jpeg); /* use default */
2059 fix_headers(p_jpeg); /* derive Huffman and other lookup-tables */
2060 src_dim.width = p_jpeg->x_size;
2061 src_dim.height = p_jpeg->y_size;
2062 if (format & FORMAT_RESIZE)
2063 resize = true;
2064 if (format & FORMAT_DITHER)
2065 dither = true;
2066 if (resize) {
2067 struct dim resize_dim = {
2068 .width = bm->width,
2069 .height = bm->height,
2070 };
2071 if (format & FORMAT_KEEP_ASPECT)
2072 recalc_dimension(&resize_dim, &src_dim);
2073 bm->width = resize_dim.width;
2074 bm->height = resize_dim.height;
2075 } else {
2076 bm->width = p_jpeg->x_size;
2077 bm->height = p_jpeg->y_size;
2078 }
2079 p_jpeg->h_scale[0] = calc_scale(p_jpeg->x_size, bm->width);
2080 p_jpeg->v_scale[0] = calc_scale(p_jpeg->y_size, bm->height);
2081 JDEBUGF("luma IDCT size: %dx%d\n", BIT_N(p_jpeg->h_scale[0]),
2082 BIT_N(p_jpeg->v_scale[0]));
2083 if ((p_jpeg->x_size << p_jpeg->h_scale[0]) >> 3 == bm->width &&
2084 (p_jpeg->y_size << p_jpeg->v_scale[0]) >> 3 == bm->height)
2085 resize = false;
2086 #ifdef HAVE_LCD_COLOR
2087 p_jpeg->h_scale[1] = p_jpeg->h_scale[0] +
2088 p_jpeg->frameheader[0].horizontal_sampling - 1;
2089 p_jpeg->v_scale[1] = p_jpeg->v_scale[0] +
2090 p_jpeg->frameheader[0].vertical_sampling - 1;
2091 JDEBUGF("chroma IDCT size: %dx%d\n", BIT_N(p_jpeg->h_scale[1]),
2092 BIT_N(p_jpeg->v_scale[1]));
2093 #endif
2094 JDEBUGF("scaling from %dx%d -> %dx%d\n",
2095 (p_jpeg->x_size << p_jpeg->h_scale[0]) >> 3,
2096 (p_jpeg->y_size << p_jpeg->v_scale[0]) >> 3,
2097 bm->width, bm->height);
2098 fix_quant_tables(p_jpeg);
2099 int decode_w = BIT_N(p_jpeg->h_scale[0]) - 1;
2100 int decode_h = BIT_N(p_jpeg->v_scale[0]) - 1;
2101 src_dim.width = (p_jpeg->x_size << p_jpeg->h_scale[0]) >> 3;
2102 src_dim.height = (p_jpeg->y_size << p_jpeg->v_scale[0]) >> 3;
2103 #ifdef JPEG_IDCT_TRANSPOSE
2104 if (p_jpeg->v_scale[0] > 2)
2105 p_jpeg->zero_need[0] = (decode_w << 3) + decode_h;
2106 else
2107 #endif
2108 p_jpeg->zero_need[0] = (decode_h << 3) + decode_w;
2109 p_jpeg->k_need[0] = zig[(decode_h << 3) + decode_w];
2110 JDEBUGF("need luma components to %d\n", p_jpeg->k_need[0]);
2111 #ifdef HAVE_LCD_COLOR
2112 decode_w = BIT_N(MIN(p_jpeg->h_scale[1],3)) - 1;
2113 decode_h = BIT_N(MIN(p_jpeg->v_scale[1],3)) - 1;
2114 if (p_jpeg->v_scale[1] > 2)
2115 p_jpeg->zero_need[1] = (decode_w << 3) + decode_h;
2116 else
2117 p_jpeg->zero_need[1] = (decode_h << 3) + decode_w;
2118 p_jpeg->k_need[1] = zig[(decode_h << 3) + decode_w];
2119 JDEBUGF("need chroma components to %d\n", p_jpeg->k_need[1]);
2120 #endif
2121 if (cformat)
2122 bm_size = cformat->get_size(bm);
2123 else
2124 bm_size = BM_SIZE(bm->width,bm->height,FORMAT_NATIVE,false);
2125 if (bm_size > maxsize)
2126 return -1;
2127 char *buf_start = (char *)bm->data + bm_size;
2128 char *buf_end = (char *)bm->data + maxsize;
2129 maxsize = buf_end - buf_start;
2130 #ifndef JPEG_FROM_MEM
2131 ALIGN_BUFFER(buf_start, maxsize, sizeof(uint32_t));
2132 if (maxsize < (int)sizeof(struct jpeg))
2133 return -1;
2134 memmove(buf_start, p_jpeg, sizeof(struct jpeg));
2135 p_jpeg = (struct jpeg *)buf_start;
2136 buf_start += sizeof(struct jpeg);
2137 maxsize = buf_end - buf_start;
2138 #endif
2139 fix_huff_tables(p_jpeg);
2140 #ifdef HAVE_LCD_COLOR
2141 int decode_buf_size = (p_jpeg->x_mbl << p_jpeg->h_scale[1])
2142 << p_jpeg->v_scale[1];
2143 #else
2144 int decode_buf_size = (p_jpeg->x_mbl << p_jpeg->h_scale[0])
2145 << p_jpeg->v_scale[0];
2146 decode_buf_size <<= p_jpeg->frameheader[0].horizontal_sampling +
2147 p_jpeg->frameheader[0].vertical_sampling - 2;
2148 #endif
2149 decode_buf_size *= JPEG_PIX_SZ;
2150 JDEBUGF("decode buffer size: %d\n", decode_buf_size);
2151 p_jpeg->img_buf = (jpeg_pix_t *)buf_start;
2152 if (buf_end - buf_start < decode_buf_size)
2153 return -1;
2154 buf_start += decode_buf_size;
2155 maxsize = buf_end - buf_start;
2156 memset(p_jpeg->img_buf, 0, decode_buf_size);
2157 p_jpeg->mcu_row = 0;
2158 p_jpeg->restart = p_jpeg->restart_interval;
2159 rset.rowstart = 0;
2160 rset.rowstop = bm->height;
2161 rset.rowstep = 1;
2162 p_jpeg->resize = resize;
2163 if (resize)
2164 {
2165 if (resize_on_load(bm, dither, &src_dim, &rset, buf_start, maxsize,
2166 cformat, IF_PIX_FMT(p_jpeg->blocks == 1 ? 0 : 1,) store_row_jpeg,
2167 p_jpeg))
2168 return bm_size;
2169 } else {
2170 int row;
2171 struct scaler_context ctx = {
2172 .bm = bm,
2173 .dither = dither,
2174 };
2175 #if LCD_DEPTH > 1
2176 void (*output_row_8)(uint32_t, void*, struct scaler_context*) =
2177 output_row_8_native;
2178 #elif defined(PLUGIN)
2179 void (*output_row_8)(uint32_t, void*, struct scaler_context*) = NULL;
2180 #endif
2181 #if LCD_DEPTH > 1 || defined(PLUGIN)
2182 if (cformat)
2183 output_row_8 = cformat->output_row_8;
2184 #endif
2185 struct img_part *part;
2186 for (row = 0; row < bm->height; row++)
2187 {
2188 part = store_row_jpeg(p_jpeg);
2189 #ifdef HAVE_LCD_COLOR
2190 if (p_jpeg->blocks > 1)
2191 {
2192 struct uint8_rgb *qp = part->buf;
2193 struct uint8_rgb *end = qp + bm->width;
2194 uint8_t y, u, v;
2195 unsigned r, g, b;
2196 for (; qp < end; qp++)
2197 {
2198 y = qp->blue;
2199 u = qp->green;
2200 v = qp->red;
2201 yuv_to_rgb(y, u, v, &r, &g, &b);
2202 qp->red = r;
2203 qp->blue = b;
2204 qp->green = g;
2205 }
2206 }
2207 #endif
2208 output_row_8(row, part->buf, &ctx);
2209 }
2210 return bm_size;
2211 }
2212 return 0;
2213 }
2214
2215 /**************** end JPEG code ********************/
My public Rockbox git repo