4    (C) 2004-2006  Luc Saillard (luc@saillard.org)
24  *   0: use a C version of this tests:  {  a<0?0:(a>255?255:a) }
129 				p0[k + 0x30] = (4 * pw) + 0x80;  in build_table_color()
133 				p0[k + 0x70] = (-4 * pw) + 0x80;  in build_table_color()
166  *      yyyy = get_bits(4)
181  *   op == 2 when (i%4)==0
186 static const unsigned char hash_table_ops[64*4] = {
260 	{4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4,},
262 	{4, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 4,},
268 	{4, 5, 5, 4, 5, 4, 4, 5, 5, 4, 4, 5, 4, 5, 5, 4,},
313 		else if (flags == 4)  in pwc_dec23_init()
347  * Copy the 4x4 image block to Y plane buffer
353 	const int *c = src;  in copy_image_block_Y()  local
356 	*d++ = cm[c[0] >> scalebits];  in copy_image_block_Y()
357 	*d++ = cm[c[1] >> scalebits];  in copy_image_block_Y()
358 	*d++ = cm[c[2] >> scalebits];  in copy_image_block_Y()
359 	*d++ = cm[c[3] >> scalebits];  in copy_image_block_Y()
362 	*d++ = cm[c[4] >> scalebits];  in copy_image_block_Y()
363 	*d++ = cm[c[5] >> scalebits];  in copy_image_block_Y()
364 	*d++ = cm[c[6] >> scalebits];  in copy_image_block_Y()
365 	*d++ = cm[c[7] >> scalebits];  in copy_image_block_Y()
368 	*d++ = cm[c[8] >> scalebits];  in copy_image_block_Y()
369 	*d++ = cm[c[9] >> scalebits];  in copy_image_block_Y()
370 	*d++ = cm[c[10] >> scalebits];  in copy_image_block_Y()
371 	*d++ = cm[c[11] >> scalebits];  in copy_image_block_Y()
374 	*d++ = cm[c[12] >> scalebits];  in copy_image_block_Y()
375 	*d++ = cm[c[13] >> scalebits];  in copy_image_block_Y()
376 	*d++ = cm[c[14] >> scalebits];  in copy_image_block_Y()
377 	*d++ = cm[c[15] >> scalebits];  in copy_image_block_Y()
380 	const int *c = src;  in copy_image_block_Y()
382 	for (i = 0; i < 4; i++, c++)  in copy_image_block_Y()
383 		*d++ = CLAMP((*c) >> scalebits);  in copy_image_block_Y()
386 	for (i = 0; i < 4; i++, c++)  in copy_image_block_Y()
387 		*d++ = CLAMP((*c) >> scalebits);  in copy_image_block_Y()
390 	for (i = 0; i < 4; i++, c++)  in copy_image_block_Y()
391 		*d++ = CLAMP((*c) >> scalebits);  in copy_image_block_Y()
394 	for (i = 0; i < 4; i++, c++)  in copy_image_block_Y()
395 		*d++ = CLAMP((*c) >> scalebits);  in copy_image_block_Y()
400  * Copy the 4x4 image block to a CrCb plane buffer
408 	const int *c = src;  in copy_image_block_CrCb()  local
411 	*d++ = cm[c[0] >> scalebits];  in copy_image_block_CrCb()
412 	*d++ = cm[c[4] >> scalebits];  in copy_image_block_CrCb()
413 	*d++ = cm[c[1] >> scalebits];  in copy_image_block_CrCb()
414 	*d++ = cm[c[5] >> scalebits];  in copy_image_block_CrCb()
415 	*d++ = cm[c[2] >> scalebits];  in copy_image_block_CrCb()
416 	*d++ = cm[c[6] >> scalebits];  in copy_image_block_CrCb()
417 	*d++ = cm[c[3] >> scalebits];  in copy_image_block_CrCb()
418 	*d++ = cm[c[7] >> scalebits];  in copy_image_block_CrCb()
421 	*d++ = cm[c[12] >> scalebits];  in copy_image_block_CrCb()
422 	*d++ = cm[c[8] >> scalebits];  in copy_image_block_CrCb()
423 	*d++ = cm[c[13] >> scalebits];  in copy_image_block_CrCb()
424 	*d++ = cm[c[9] >> scalebits];  in copy_image_block_CrCb()
425 	*d++ = cm[c[14] >> scalebits];  in copy_image_block_CrCb()
426 	*d++ = cm[c[10] >> scalebits];  in copy_image_block_CrCb()
427 	*d++ = cm[c[15] >> scalebits];  in copy_image_block_CrCb()
428 	*d++ = cm[c[11] >> scalebits];  in copy_image_block_CrCb()
432 	const int *c2 = src + 4;  in copy_image_block_CrCb()
435 	for (i = 0; i < 4; i++, c1++, c2++) {  in copy_image_block_CrCb()
441 	for (i = 0; i < 4; i++, c1++, c2++) {  in copy_image_block_CrCb()
485  * Decode a 4x4 pixel block
512 	channel_v = ((channel_v & 1) << 2) | (channel_v & 2) | ((channel_v & 4) >> 2);  in decode_block()
531 		op = hash_table_ops[htable_idx * 4];  in decode_block()
547 			__get_nbits(pdec, 4, yyyy);  in decode_block()
570 			offset1 += hash_table_ops [htable_idx * 4 + 2];  in decode_block()
573 			rows = ptable0004[offset1 + hash_table_ops [htable_idx * 4 + 3]];  in decode_block()
578 			shift = hash_table_ops[htable_idx * 4 + 1];  in decode_block()
602 	get_nbits(pdec, 4, compression_index);  in DecompressBand23()
605 	nblocks = compressed_image_width / 4;  in DecompressBand23()
610 	/* Each block decode a square of 4x4 */  in DecompressBand23()
614 		planar_y += 4;  in DecompressBand23()
624 	/* Each block decode a square of 4x4 */  in DecompressBand23()
660 	bandlines_left = pdev->height / 4;  in pwc_dec23_decompress()
661 	bytes_per_block = pdev->width * 4;  in pwc_dec23_decompress()
666 	pout_planar_v = dst + plane_size + plane_size / 4;  in pwc_dec23_decompress()