decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
j_lossy_d_ptr lossyd = (j_lossy_d_ptr) cinfo->codec;
phuff_entropy_ptr entropy = (phuff_entropy_ptr) lossyd->entropy_private;
int Al = cinfo->Al;
register int s, r;
int blkn, ci;
JBLOCKROW block;
BITREAD_STATE_VARS;
savable_state state;
d_derived_tbl * tbl;
jpeg_component_info * compptr;
/* Process restart marker if needed; may have to suspend */
if (cinfo->restart_interval) {
if (entropy->restarts_to_go == 0)
if (! process_restart(cinfo))
return FALSE;
}
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->insufficient_data) {
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(state, entropy->saved);
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->data_units_in_MCU; blkn++) {
block = MCU_data[blkn];
ci = cinfo->MCU_membership[blkn];
compptr = cinfo->cur_comp_info[ci];
tbl = entropy->derived_tbls[compptr->dc_tbl_no];
/* Decode a single block's worth of coefficients */
/* Section F.2.2.1: decode the DC coefficient difference */
HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
if (s) {
CHECK_BIT_BUFFER(br_state, s, return FALSE);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
}
/* Convert DC difference to actual value, update last_dc_val */
s += state.last_dc_val[ci];
state.last_dc_val[ci] = s;
/* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */
(*block)[0] = (JCOEF) (s << Al);
}
/* Completed MCU, so update state */
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(entropy->saved, state);
}
METHODDEF boolean decode_mcu_AC_first(j_decompress_ptr cinfo, JBLOCKROW * MCU_data)
{
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
int Se = cinfo->Se;
int Al = cinfo->Al;
register int s, k, r;
unsigned int EOBRUN;
JBLOCKROW block;
BITREAD_STATE_VARS;
d_derived_tbl *tbl;
/* Process restart marker if needed; may have to suspend */
if(cinfo->restart_interval)
{
if(entropy->restarts_to_go == 0)
if(!process_restart(cinfo))
return FALSE;
}
/* Load up working state.
* We can avoid loading/saving bitread state if in an EOB run.
*/
EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we care about */
/* There is always only one block per MCU */
if(EOBRUN > 0) /* if it's a band of zeroes... */
EOBRUN--; /* ...process it now (we do nothing) */
else
{
BITREAD_LOAD_STATE(cinfo, entropy->bitstate);
block = MCU_data[0];
tbl = entropy->ac_derived_tbl;
for(k = cinfo->Ss; k <= Se; k++)
{
HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
r = s >> 4;
s &= 15;
if(s)
{
k += r;
CHECK_BIT_BUFFER(br_state, s, return FALSE);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
}
else
{
if(r == 15)
{ /* ZRL */
k += 15; /* skip 15 zeroes in band */
}
else
{ /* EOBr, run length is 2^r + appended bits */
EOBRUN = 1 << r;
if(r)
{ /* EOBr, r > 0 */
CHECK_BIT_BUFFER(br_state, r, return FALSE);
r = GET_BITS(r);
EOBRUN += r;
}
EOBRUN--; /* this band is processed at this moment */
break; /* force end-of-band */
}
}
}
BITREAD_SAVE_STATE(cinfo, entropy->bitstate);
}
boolean decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
int Se = cinfo->Se;
int Al = cinfo->Al;
register int s, k, r;
unsigned int EOBRUN;
JBLOCKROW block;
BITREAD_STATE_VARS;
d_derived_tbl * tbl;
/* Process restart marker if needed; may have to suspend */
if (cinfo->restart_interval)
{
if (entropy->restarts_to_go == 0)
if (! process_restart(cinfo))
return FALSE;
}
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->pub.insufficient_data)
{
/* Load up working state.
* We can avoid loading/saving bitread state if in an EOB run.
*/
EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
/* There is always only one block per MCU */
if (EOBRUN > 0) /* if it's a band of zeroes... */
EOBRUN--; /* ...process it now (we do nothing) */
else
{
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
block = MCU_data[0];
tbl = entropy->ac_derived_tbl;
for (k = cinfo->Ss; k <= Se; k++)
{
if ( ! br_state.HUFF_DECODE(s, bits_left, get_buffer, tbl) )
return FALSE;
r = s >> 4;
s &= 15;
if (s)
{
k += r;
if ( ! br_state.CHECK_BIT_BUFFER(s, bits_left, get_buffer) )
return FALSE;
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
}
else
{
if (r == 15) /* ZRL */
{
k += 15; /* skip 15 zeroes in band */
}
else /* EOBr, run length is 2^r + appended bits */
{
EOBRUN = 1 << r;
if (r) /* EOBr, r > 0 */
{
if ( ! br_state.CHECK_BIT_BUFFER(r, bits_left, get_buffer) )
return FALSE;
r = GET_BITS(r);
EOBRUN += r;
}
EOBRUN--; /* this band is processed at this moment */
break; /* force end-of-band */
}
}
}
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
}
/* Completed MCU, so update state */
entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
}
decode_mcus (j_decompress_ptr cinfo, JDIFFIMAGE diff_buf,
JDIMENSION MCU_row_num, JDIMENSION MCU_col_num, JDIMENSION nMCU)
{
j_lossless_d_ptr losslsd = (j_lossless_d_ptr) cinfo->codec;
lhuff_entropy_ptr entropy = (lhuff_entropy_ptr) losslsd->entropy_private;
unsigned int mcu_num;
int sampn, ci, yoffset, MCU_width, ptrn;
BITREAD_STATE_VARS;
/* Set output pointer locations based on MCU_col_num */
for (ptrn = 0; ptrn < entropy->num_output_ptrs; ptrn++) {
ci = entropy->output_ptr_info[ptrn].ci;
yoffset = entropy->output_ptr_info[ptrn].yoffset;
MCU_width = entropy->output_ptr_info[ptrn].MCU_width;
entropy->output_ptr[ptrn] =
diff_buf[ci][MCU_row_num + (JDIMENSION)yoffset] + MCU_col_num * (JDIMENSION)MCU_width;
}
/*
* If we've run out of data, zero out the buffers and return.
* By resetting the undifferencer, the output samples will be CENTERJSAMPLE.
*
* NB: We should find a way to do this without interacting with the
* undifferencer module directly.
*/
if (entropy->insufficient_data) {
for (ptrn = 0; ptrn < entropy->num_output_ptrs; ptrn++)
jzero_far((void FAR *) entropy->output_ptr[ptrn],
nMCU * (size_t)entropy->output_ptr_info[ptrn].MCU_width * SIZEOF(JDIFF));
(*losslsd->predict_process_restart) (cinfo);
}
else {
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
/* Outer loop handles the number of MCU requested */
for (mcu_num = 0; mcu_num < nMCU; mcu_num++) {
/* Inner loop handles the samples in the MCU */
for (sampn = 0; sampn < cinfo->data_units_in_MCU; sampn++) {
d_derived_tbl * dctbl = entropy->cur_tbls[sampn];
register int s, r;
/* Section H.2.2: decode the sample difference */
HUFF_DECODE(s, br_state, dctbl, return mcu_num, label1);
if (s) {
if (s == 16) /* special case: always output 32768 */
s = 32768;
else { /* normal case: fetch subsequent bits */
CHECK_BIT_BUFFER(br_state, s, return mcu_num);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
}
}
/* Output the sample difference */
*entropy->output_ptr[entropy->output_ptr_index[sampn]]++ = (JDIFF) s;
}
/* Completed MCU, so update state */
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
}
}
return nMCU;
}
decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
__boundcheck_metadata_store((void *)(&entropy),(void *)((size_t)(&entropy)+sizeof(entropy)*8-1));
int Al = cinfo->Al;
__boundcheck_metadata_store((void *)(&Al),(void *)((size_t)(&Al)+sizeof(Al)*8-1));
register int s, r;
int blkn;
__boundcheck_metadata_store((void *)(&blkn),(void *)((size_t)(&blkn)+sizeof(blkn)*8-1));
int ci;
__boundcheck_metadata_store((void *)(&ci),(void *)((size_t)(&ci)+sizeof(ci)*8-1));
JBLOCKROW block;
__boundcheck_metadata_store((void *)(&block),(void *)((size_t)(&block)+sizeof(block)*8-1));
BITREAD_STATE_VARS;
__boundcheck_metadata_store((void *)(&br_state),(void *)((size_t)(&br_state)+sizeof(br_state)*8-1));
savable_state state;
__boundcheck_metadata_store((void *)(&state),(void *)((size_t)(&state)+sizeof(state)*8-1));
d_derived_tbl * tbl;
__boundcheck_metadata_store((void *)(&tbl),(void *)((size_t)(&tbl)+sizeof(tbl)*8-1));
jpeg_component_info * compptr;
__boundcheck_metadata_store((void *)(&compptr),(void *)((size_t)(&compptr)+sizeof(compptr)*8-1));
/* Process restart marker if needed; may have to suspend */
if (cinfo->restart_interval) {
if (entropy->restarts_to_go == 0)
if (! process_restart(cinfo))
return FALSE;
}
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(state, entropy->saved);
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
block = (*(JBLOCKROW *)(__boundcheck_ptr_reference(307,13,"decode_mcu_DC_first",(void *)(&MCU_data[0]),(void *)(&MCU_data[blkn]))));
ci = cinfo->MCU_membership[_RV_insert_check(0,10,308,10,"decode_mcu_DC_first",blkn)];
compptr = cinfo->cur_comp_info[_RV_insert_check(0,4,309,15,"decode_mcu_DC_first",ci)];
tbl = entropy->derived_tbls[_RV_insert_check(0,4,310,11,"decode_mcu_DC_first",compptr->dc_tbl_no)];
/* Decode a single block's worth of coefficients */
/* Section F.2.2.1: decode the DC coefficient difference */
HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
if (s) {
CHECK_BIT_BUFFER(br_state, s, return FALSE);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
}
/* Convert DC difference to actual value, update last_dc_val */
s += state.last_dc_val[_RV_insert_check(0,4,323,10,"decode_mcu_DC_first",ci)];
state.last_dc_val[_RV_insert_check(0,4,324,5,"decode_mcu_DC_first",ci)] = s;
/* Scale and output the DC coefficient (assumes jpeg_natural_order[0]=0) */
(*(JBLOCKROW)(__boundcheck_ptr_reference(326,7,"decode_mcu_DC_first",(void *)(block),(void *)(block))))[0] = (JCOEF) (s << Al);
}
/* Completed MCU, so update state */
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(entropy->saved, state);
/* Account for restart interval (no-op if not using restarts) */
entropy->restarts_to_go--;
return TRUE;
}
