* Copyright (C) 1994-1997, Thomas G. Lane.
* libjpeg-turbo Modifications:
* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
- * Copyright (C) 2010, 2015-2016, D. R. Commander.
- * Copyright (C) 2015, Google, Inc.
+ * Copyright (C) 2010, 2015-2016, 2019-2020, 2022, D. R. Commander.
+ * Copyright (C) 2015, 2020, Google, Inc.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
/* Forward declarations */
-METHODDEF(int) decompress_onepass
- (j_decompress_ptr cinfo, JSAMPIMAGE output_buf);
+METHODDEF(int) decompress_onepass(j_decompress_ptr cinfo,
+ JSAMPIMAGE output_buf);
#ifdef D_MULTISCAN_FILES_SUPPORTED
-METHODDEF(int) decompress_data
- (j_decompress_ptr cinfo, JSAMPIMAGE output_buf);
+METHODDEF(int) decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf);
#endif
#ifdef BLOCK_SMOOTHING_SUPPORTED
-LOCAL(boolean) smoothing_ok (j_decompress_ptr cinfo);
-METHODDEF(int) decompress_smooth_data
- (j_decompress_ptr cinfo, JSAMPIMAGE output_buf);
+LOCAL(boolean) smoothing_ok(j_decompress_ptr cinfo);
+METHODDEF(int) decompress_smooth_data(j_decompress_ptr cinfo,
+ JSAMPIMAGE output_buf);
#endif
*/
METHODDEF(void)
-start_input_pass (j_decompress_ptr cinfo)
+start_input_pass(j_decompress_ptr cinfo)
{
cinfo->input_iMCU_row = 0;
start_iMCU_row(cinfo);
*/
METHODDEF(void)
-start_output_pass (j_decompress_ptr cinfo)
+start_output_pass(j_decompress_ptr cinfo)
{
#ifdef BLOCK_SMOOTHING_SUPPORTED
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
/* If multipass, check to see whether to use block smoothing on this pass */
if (coef->pub.coef_arrays != NULL) {
*/
METHODDEF(int)
-decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+decompress_onepass(j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
JDIMENSION MCU_col_num; /* index of current MCU within row */
JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
jzero_far((void FAR *) coef->MCU_buffer[0],
(size_t) (cinfo->blocks_in_MCU * sizeof(JBLOCK)));
#else
- jzero_far((void *) coef->MCU_buffer[0],
- (size_t) (cinfo->blocks_in_MCU * sizeof(JBLOCK)));
+ jzero_far((void *)coef->MCU_buffer[0],
+ (size_t)(cinfo->blocks_in_MCU * sizeof(JBLOCK)));
#endif
- if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
+ if (!cinfo->entropy->insufficient_data)
+ cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row;
+ if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
/* Suspension forced; update state counters and exit */
coef->MCU_vert_offset = yoffset;
coef->MCU_ctr = MCU_col_num;
* incremented past them!). Note the inner loop relies on having
* allocated the MCU_buffer[] blocks sequentially.
*/
- blkn = 0; /* index of current DCT block within MCU */
+ blkn = 0; /* index of current DCT block within MCU */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Don't bother to IDCT an uninteresting component. */
- if (! compptr->component_needed) {
+ if (!compptr->component_needed) {
blkn += compptr->MCU_blocks;
continue;
}
inverse_DCT = cinfo->idct->inverse_DCT[compptr->component_index];
- useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
- : compptr->last_col_width;
+ useful_width = (MCU_col_num < last_MCU_col) ?
+ compptr->MCU_width : compptr->last_col_width;
output_ptr = output_buf[compptr->component_index] +
- yoffset * compptr->_DCT_scaled_size;
+ yoffset * compptr->_DCT_scaled_size;
start_col = (MCU_col_num - cinfo->master->first_iMCU_col) *
- compptr->MCU_sample_width;
+ compptr->MCU_sample_width;
for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
if (cinfo->input_iMCU_row < last_iMCU_row ||
- yoffset+yindex < compptr->last_row_height) {
+ yoffset + yindex < compptr->last_row_height) {
output_col = start_col;
for (xindex = 0; xindex < useful_width; xindex++) {
(*inverse_DCT) (cinfo, compptr,
- (JCOEFPTR) coef->MCU_buffer[blkn+xindex],
+ (JCOEFPTR)coef->MCU_buffer[blkn + xindex],
output_ptr, output_col);
output_col += compptr->_DCT_scaled_size;
}
*/
METHODDEF(int)
-dummy_consume_data (j_decompress_ptr cinfo)
+dummy_consume_data(j_decompress_ptr cinfo)
{
return JPEG_SUSPENDED; /* Always indicate nothing was done */
}
*/
METHODDEF(int)
-consume_data (j_decompress_ptr cinfo)
+consume_data(j_decompress_ptr cinfo)
{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
JDIMENSION MCU_col_num; /* index of current MCU within row */
int blkn, ci, xindex, yindex, yoffset;
JDIMENSION start_col;
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
buffer[ci] = (*cinfo->mem->access_virt_barray)
- ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
+ ((j_common_ptr)cinfo, coef->whole_image[compptr->component_index],
cinfo->input_iMCU_row * compptr->v_samp_factor,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
+ (JDIMENSION)compptr->v_samp_factor, TRUE);
/* Note: entropy decoder expects buffer to be zeroed,
* but this is handled automatically by the memory manager
* because we requested a pre-zeroed array.
compptr = cinfo->cur_comp_info[ci];
start_col = MCU_col_num * compptr->MCU_width;
for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
- buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
+ buffer_ptr = buffer[ci][yindex + yoffset] + start_col;
for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
coef->MCU_buffer[blkn++] = buffer_ptr++;
}
}
}
+ if (!cinfo->entropy->insufficient_data)
+ cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row;
/* Try to fetch the MCU. */
- if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
+ if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) {
/* Suspension forced; update state counters and exit */
coef->MCU_vert_offset = yoffset;
coef->MCU_ctr = MCU_col_num;
*/
METHODDEF(int)
-decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
JDIMENSION block_num;
int ci, block_row, block_rows;
while (cinfo->input_scan_number < cinfo->output_scan_number ||
(cinfo->input_scan_number == cinfo->output_scan_number &&
cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) {
- if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED)
+ if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
return JPEG_SUSPENDED;
}
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
/* Don't bother to IDCT an uninteresting component. */
- if (! compptr->component_needed)
+ if (!compptr->component_needed)
continue;
/* Align the virtual buffer for this component. */
buffer = (*cinfo->mem->access_virt_barray)
- ((j_common_ptr) cinfo, coef->whole_image[ci],
+ ((j_common_ptr)cinfo, coef->whole_image[ci],
cinfo->output_iMCU_row * compptr->v_samp_factor,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
+ (JDIMENSION)compptr->v_samp_factor, FALSE);
/* Count non-dummy DCT block rows in this iMCU row. */
if (cinfo->output_iMCU_row < last_iMCU_row)
block_rows = compptr->v_samp_factor;
else {
/* NB: can't use last_row_height here; it is input-side-dependent! */
- block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+ block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor);
if (block_rows == 0) block_rows = compptr->v_samp_factor;
}
inverse_DCT = cinfo->idct->inverse_DCT[ci];
output_col = 0;
for (block_num = cinfo->master->first_MCU_col[ci];
block_num <= cinfo->master->last_MCU_col[ci]; block_num++) {
- (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr,
- output_ptr, output_col);
+ (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)buffer_ptr, output_ptr,
+ output_col);
buffer_ptr++;
output_col += compptr->_DCT_scaled_size;
}
#ifdef BLOCK_SMOOTHING_SUPPORTED
/*
- * This code applies interblock smoothing as described by section K.8
- * of the JPEG standard: the first 5 AC coefficients are estimated from
- * the DC values of a DCT block and its 8 neighboring blocks.
+ * This code applies interblock smoothing; the first 9 AC coefficients are
+ * estimated from the DC values of a DCT block and its 24 neighboring blocks.
* We apply smoothing only for progressive JPEG decoding, and only if
* the coefficients it can estimate are not yet known to full precision.
*/
-/* Natural-order array positions of the first 5 zigzag-order coefficients */
+/* Natural-order array positions of the first 9 zigzag-order coefficients */
#define Q01_POS 1
#define Q10_POS 8
#define Q20_POS 16
#define Q11_POS 9
#define Q02_POS 2
+#define Q03_POS 3
+#define Q12_POS 10
+#define Q21_POS 17
+#define Q30_POS 24
/*
* Determine whether block smoothing is applicable and safe.
*/
LOCAL(boolean)
-smoothing_ok (j_decompress_ptr cinfo)
+smoothing_ok(j_decompress_ptr cinfo)
{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
boolean smoothing_useful = FALSE;
int ci, coefi;
jpeg_component_info *compptr;
JQUANT_TBL *qtable;
- int *coef_bits;
- int *coef_bits_latch;
+ int *coef_bits, *prev_coef_bits;
+ int *coef_bits_latch, *prev_coef_bits_latch;
- if (! cinfo->progressive_mode || cinfo->coef_bits == NULL)
+ if (!cinfo->progressive_mode || cinfo->coef_bits == NULL)
return FALSE;
/* Allocate latch area if not already done */
if (coef->coef_bits_latch == NULL)
coef->coef_bits_latch = (int *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- cinfo->num_components *
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+ cinfo->num_components * 2 *
(SAVED_COEFS * sizeof(int)));
coef_bits_latch = coef->coef_bits_latch;
+ prev_coef_bits_latch =
+ &coef->coef_bits_latch[cinfo->num_components * SAVED_COEFS];
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
/* All components' quantization values must already be latched. */
if ((qtable = compptr->quant_table) == NULL)
return FALSE;
- /* Verify DC & first 5 AC quantizers are nonzero to avoid zero-divide. */
+ /* Verify DC & first 9 AC quantizers are nonzero to avoid zero-divide. */
if (qtable->quantval[0] == 0 ||
qtable->quantval[Q01_POS] == 0 ||
qtable->quantval[Q10_POS] == 0 ||
qtable->quantval[Q20_POS] == 0 ||
qtable->quantval[Q11_POS] == 0 ||
- qtable->quantval[Q02_POS] == 0)
+ qtable->quantval[Q02_POS] == 0 ||
+ qtable->quantval[Q03_POS] == 0 ||
+ qtable->quantval[Q12_POS] == 0 ||
+ qtable->quantval[Q21_POS] == 0 ||
+ qtable->quantval[Q30_POS] == 0)
return FALSE;
/* DC values must be at least partly known for all components. */
coef_bits = cinfo->coef_bits[ci];
+ prev_coef_bits = cinfo->coef_bits[ci + cinfo->num_components];
if (coef_bits[0] < 0)
return FALSE;
+ coef_bits_latch[0] = coef_bits[0];
/* Block smoothing is helpful if some AC coefficients remain inaccurate. */
- for (coefi = 1; coefi <= 5; coefi++) {
+ for (coefi = 1; coefi < SAVED_COEFS; coefi++) {
+ if (cinfo->input_scan_number > 1)
+ prev_coef_bits_latch[coefi] = prev_coef_bits[coefi];
+ else
+ prev_coef_bits_latch[coefi] = -1;
coef_bits_latch[coefi] = coef_bits[coefi];
if (coef_bits[coefi] != 0)
smoothing_useful = TRUE;
}
coef_bits_latch += SAVED_COEFS;
+ prev_coef_bits_latch += SAVED_COEFS;
}
return smoothing_useful;
*/
METHODDEF(int)
-decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
+decompress_smooth_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf)
{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
+ my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
JDIMENSION block_num, last_block_column;
int ci, block_row, block_rows, access_rows;
JBLOCKARRAY buffer;
- JBLOCKROW buffer_ptr, prev_block_row, next_block_row;
+ JBLOCKROW buffer_ptr, prev_prev_block_row, prev_block_row;
+ JBLOCKROW next_block_row, next_next_block_row;
JSAMPARRAY output_ptr;
JDIMENSION output_col;
jpeg_component_info *compptr;
inverse_DCT_method_ptr inverse_DCT;
- boolean first_row, last_row;
+ boolean change_dc;
JCOEF *workspace;
int *coef_bits;
JQUANT_TBL *quanttbl;
- JLONG Q00,Q01,Q02,Q10,Q11,Q20, num;
- int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9;
+ JLONG Q00, Q01, Q02, Q03 = 0, Q10, Q11, Q12 = 0, Q20, Q21 = 0, Q30 = 0, num;
+ int DC01, DC02, DC03, DC04, DC05, DC06, DC07, DC08, DC09, DC10, DC11, DC12,
+ DC13, DC14, DC15, DC16, DC17, DC18, DC19, DC20, DC21, DC22, DC23, DC24,
+ DC25;
int Al, pred;
/* Keep a local variable to avoid looking it up more than once */
/* Force some input to be done if we are getting ahead of the input. */
while (cinfo->input_scan_number <= cinfo->output_scan_number &&
- ! cinfo->inputctl->eoi_reached) {
+ !cinfo->inputctl->eoi_reached) {
if (cinfo->input_scan_number == cinfo->output_scan_number) {
/* If input is working on current scan, we ordinarily want it to
* have completed the current row. But if input scan is DC,
- * we want it to keep one row ahead so that next block row's DC
+ * we want it to keep two rows ahead so that next two block rows' DC
* values are up to date.
*/
- JDIMENSION delta = (cinfo->Ss == 0) ? 1 : 0;
- if (cinfo->input_iMCU_row > cinfo->output_iMCU_row+delta)
+ JDIMENSION delta = (cinfo->Ss == 0) ? 2 : 0;
+ if (cinfo->input_iMCU_row > cinfo->output_iMCU_row + delta)
break;
}
- if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED)
+ if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
return JPEG_SUSPENDED;
}
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
/* Don't bother to IDCT an uninteresting component. */
- if (! compptr->component_needed)
+ if (!compptr->component_needed)
continue;
/* Count non-dummy DCT block rows in this iMCU row. */
- if (cinfo->output_iMCU_row < last_iMCU_row) {
+ if (cinfo->output_iMCU_row + 1 < last_iMCU_row) {
+ block_rows = compptr->v_samp_factor;
+ access_rows = block_rows * 3; /* this and next two iMCU rows */
+ } else if (cinfo->output_iMCU_row < last_iMCU_row) {
block_rows = compptr->v_samp_factor;
access_rows = block_rows * 2; /* this and next iMCU row */
- last_row = FALSE;
} else {
/* NB: can't use last_row_height here; it is input-side-dependent! */
- block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+ block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor);
if (block_rows == 0) block_rows = compptr->v_samp_factor;
access_rows = block_rows; /* this iMCU row only */
- last_row = TRUE;
}
/* Align the virtual buffer for this component. */
- if (cinfo->output_iMCU_row > 0) {
- access_rows += compptr->v_samp_factor; /* prior iMCU row too */
+ if (cinfo->output_iMCU_row > 1) {
+ access_rows += 2 * compptr->v_samp_factor; /* prior two iMCU rows too */
buffer = (*cinfo->mem->access_virt_barray)
- ((j_common_ptr) cinfo, coef->whole_image[ci],
+ ((j_common_ptr)cinfo, coef->whole_image[ci],
+ (cinfo->output_iMCU_row - 2) * compptr->v_samp_factor,
+ (JDIMENSION)access_rows, FALSE);
+ buffer += 2 * compptr->v_samp_factor; /* point to current iMCU row */
+ } else if (cinfo->output_iMCU_row > 0) {
+ buffer = (*cinfo->mem->access_virt_barray)
+ ((j_common_ptr)cinfo, coef->whole_image[ci],
(cinfo->output_iMCU_row - 1) * compptr->v_samp_factor,
- (JDIMENSION) access_rows, FALSE);
+ (JDIMENSION)access_rows, FALSE);
buffer += compptr->v_samp_factor; /* point to current iMCU row */
- first_row = FALSE;
} else {
buffer = (*cinfo->mem->access_virt_barray)
- ((j_common_ptr) cinfo, coef->whole_image[ci],
- (JDIMENSION) 0, (JDIMENSION) access_rows, FALSE);
- first_row = TRUE;
+ ((j_common_ptr)cinfo, coef->whole_image[ci],
+ (JDIMENSION)0, (JDIMENSION)access_rows, FALSE);
}
- /* Fetch component-dependent info */
- coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS);
+ /* Fetch component-dependent info.
+ * If the current scan is incomplete, then we use the component-dependent
+ * info from the previous scan.
+ */
+ if (cinfo->output_iMCU_row > cinfo->master->last_good_iMCU_row)
+ coef_bits =
+ coef->coef_bits_latch + ((ci + cinfo->num_components) * SAVED_COEFS);
+ else
+ coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS);
+
+ /* We only do DC interpolation if no AC coefficient data is available. */
+ change_dc =
+ coef_bits[1] == -1 && coef_bits[2] == -1 && coef_bits[3] == -1 &&
+ coef_bits[4] == -1 && coef_bits[5] == -1 && coef_bits[6] == -1 &&
+ coef_bits[7] == -1 && coef_bits[8] == -1 && coef_bits[9] == -1;
+
quanttbl = compptr->quant_table;
Q00 = quanttbl->quantval[0];
Q01 = quanttbl->quantval[Q01_POS];
Q20 = quanttbl->quantval[Q20_POS];
Q11 = quanttbl->quantval[Q11_POS];
Q02 = quanttbl->quantval[Q02_POS];
+ if (change_dc) {
+ Q03 = quanttbl->quantval[Q03_POS];
+ Q12 = quanttbl->quantval[Q12_POS];
+ Q21 = quanttbl->quantval[Q21_POS];
+ Q30 = quanttbl->quantval[Q30_POS];
+ }
inverse_DCT = cinfo->idct->inverse_DCT[ci];
output_ptr = output_buf[ci];
/* Loop over all DCT blocks to be processed. */
for (block_row = 0; block_row < block_rows; block_row++) {
buffer_ptr = buffer[block_row] + cinfo->master->first_MCU_col[ci];
- if (first_row && block_row == 0)
+
+ if (block_row > 0 || cinfo->output_iMCU_row > 0)
+ prev_block_row =
+ buffer[block_row - 1] + cinfo->master->first_MCU_col[ci];
+ else
prev_block_row = buffer_ptr;
+
+ if (block_row > 1 || cinfo->output_iMCU_row > 1)
+ prev_prev_block_row =
+ buffer[block_row - 2] + cinfo->master->first_MCU_col[ci];
+ else
+ prev_prev_block_row = prev_block_row;
+
+ if (block_row < block_rows - 1 || cinfo->output_iMCU_row < last_iMCU_row)
+ next_block_row =
+ buffer[block_row + 1] + cinfo->master->first_MCU_col[ci];
else
- prev_block_row = buffer[block_row-1];
- if (last_row && block_row == block_rows-1)
next_block_row = buffer_ptr;
+
+ if (block_row < block_rows - 2 ||
+ cinfo->output_iMCU_row + 1 < last_iMCU_row)
+ next_next_block_row =
+ buffer[block_row + 2] + cinfo->master->first_MCU_col[ci];
else
- next_block_row = buffer[block_row+1];
+ next_next_block_row = next_block_row;
+
/* We fetch the surrounding DC values using a sliding-register approach.
- * Initialize all nine here so as to do the right thing on narrow pics.
+ * Initialize all 25 here so as to do the right thing on narrow pics.
*/
- DC1 = DC2 = DC3 = (int) prev_block_row[0][0];
- DC4 = DC5 = DC6 = (int) buffer_ptr[0][0];
- DC7 = DC8 = DC9 = (int) next_block_row[0][0];
+ DC01 = DC02 = DC03 = DC04 = DC05 = (int)prev_prev_block_row[0][0];
+ DC06 = DC07 = DC08 = DC09 = DC10 = (int)prev_block_row[0][0];
+ DC11 = DC12 = DC13 = DC14 = DC15 = (int)buffer_ptr[0][0];
+ DC16 = DC17 = DC18 = DC19 = DC20 = (int)next_block_row[0][0];
+ DC21 = DC22 = DC23 = DC24 = DC25 = (int)next_next_block_row[0][0];
output_col = 0;
last_block_column = compptr->width_in_blocks - 1;
for (block_num = cinfo->master->first_MCU_col[ci];
block_num <= cinfo->master->last_MCU_col[ci]; block_num++) {
/* Fetch current DCT block into workspace so we can modify it. */
- jcopy_block_row(buffer_ptr, (JBLOCKROW) workspace, (JDIMENSION) 1);
+ jcopy_block_row(buffer_ptr, (JBLOCKROW)workspace, (JDIMENSION)1);
/* Update DC values */
- if (block_num < last_block_column) {
- DC3 = (int) prev_block_row[1][0];
- DC6 = (int) buffer_ptr[1][0];
- DC9 = (int) next_block_row[1][0];
+ if (block_num == cinfo->master->first_MCU_col[ci] &&
+ block_num < last_block_column) {
+ DC04 = (int)prev_prev_block_row[1][0];
+ DC09 = (int)prev_block_row[1][0];
+ DC14 = (int)buffer_ptr[1][0];
+ DC19 = (int)next_block_row[1][0];
+ DC24 = (int)next_next_block_row[1][0];
+ }
+ if (block_num + 1 < last_block_column) {
+ DC05 = (int)prev_prev_block_row[2][0];
+ DC10 = (int)prev_block_row[2][0];
+ DC15 = (int)buffer_ptr[2][0];
+ DC20 = (int)next_block_row[2][0];
+ DC25 = (int)next_next_block_row[2][0];
}
- /* Compute coefficient estimates per K.8.
- * An estimate is applied only if coefficient is still zero,
- * and is not known to be fully accurate.
+ /* If DC interpolation is enabled, compute coefficient estimates using
+ * a Gaussian-like kernel, keeping the averages of the DC values.
+ *
+ * If DC interpolation is disabled, compute coefficient estimates using
+ * an algorithm similar to the one described in Section K.8 of the JPEG
+ * standard, except applied to a 5x5 window rather than a 3x3 window.
+ *
+ * An estimate is applied only if the coefficient is still zero and is
+ * not known to be fully accurate.
*/
/* AC01 */
- if ((Al=coef_bits[1]) != 0 && workspace[1] == 0) {
- num = 36 * Q00 * (DC4 - DC6);
+ if ((Al = coef_bits[1]) != 0 && workspace[1] == 0) {
+ num = Q00 * (change_dc ?
+ (-DC01 - DC02 + DC04 + DC05 - 3 * DC06 + 13 * DC07 -
+ 13 * DC09 + 3 * DC10 - 3 * DC11 + 38 * DC12 - 38 * DC14 +
+ 3 * DC15 - 3 * DC16 + 13 * DC17 - 13 * DC19 + 3 * DC20 -
+ DC21 - DC22 + DC24 + DC25) :
+ (-7 * DC11 + 50 * DC12 - 50 * DC14 + 7 * DC15));
if (num >= 0) {
- pred = (int) (((Q01<<7) + num) / (Q01<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q01 << 7) + num) / (Q01 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
} else {
- pred = (int) (((Q01<<7) - num) / (Q01<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q01 << 7) - num) / (Q01 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
pred = -pred;
}
- workspace[1] = (JCOEF) pred;
+ workspace[1] = (JCOEF)pred;
}
/* AC10 */
- if ((Al=coef_bits[2]) != 0 && workspace[8] == 0) {
- num = 36 * Q00 * (DC2 - DC8);
+ if ((Al = coef_bits[2]) != 0 && workspace[8] == 0) {
+ num = Q00 * (change_dc ?
+ (-DC01 - 3 * DC02 - 3 * DC03 - 3 * DC04 - DC05 - DC06 +
+ 13 * DC07 + 38 * DC08 + 13 * DC09 - DC10 + DC16 -
+ 13 * DC17 - 38 * DC18 - 13 * DC19 + DC20 + DC21 +
+ 3 * DC22 + 3 * DC23 + 3 * DC24 + DC25) :
+ (-7 * DC03 + 50 * DC08 - 50 * DC18 + 7 * DC23));
if (num >= 0) {
- pred = (int) (((Q10<<7) + num) / (Q10<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q10 << 7) + num) / (Q10 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
} else {
- pred = (int) (((Q10<<7) - num) / (Q10<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q10 << 7) - num) / (Q10 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
pred = -pred;
}
- workspace[8] = (JCOEF) pred;
+ workspace[8] = (JCOEF)pred;
}
/* AC20 */
- if ((Al=coef_bits[3]) != 0 && workspace[16] == 0) {
- num = 9 * Q00 * (DC2 + DC8 - 2*DC5);
+ if ((Al = coef_bits[3]) != 0 && workspace[16] == 0) {
+ num = Q00 * (change_dc ?
+ (DC03 + 2 * DC07 + 7 * DC08 + 2 * DC09 - 5 * DC12 - 14 * DC13 -
+ 5 * DC14 + 2 * DC17 + 7 * DC18 + 2 * DC19 + DC23) :
+ (-DC03 + 13 * DC08 - 24 * DC13 + 13 * DC18 - DC23));
if (num >= 0) {
- pred = (int) (((Q20<<7) + num) / (Q20<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q20 << 7) + num) / (Q20 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
} else {
- pred = (int) (((Q20<<7) - num) / (Q20<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q20 << 7) - num) / (Q20 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
pred = -pred;
}
- workspace[16] = (JCOEF) pred;
+ workspace[16] = (JCOEF)pred;
}
/* AC11 */
- if ((Al=coef_bits[4]) != 0 && workspace[9] == 0) {
- num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9);
+ if ((Al = coef_bits[4]) != 0 && workspace[9] == 0) {
+ num = Q00 * (change_dc ?
+ (-DC01 + DC05 + 9 * DC07 - 9 * DC09 - 9 * DC17 +
+ 9 * DC19 + DC21 - DC25) :
+ (DC10 + DC16 - 10 * DC17 + 10 * DC19 - DC02 - DC20 + DC22 -
+ DC24 + DC04 - DC06 + 10 * DC07 - 10 * DC09));
if (num >= 0) {
- pred = (int) (((Q11<<7) + num) / (Q11<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q11 << 7) + num) / (Q11 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
} else {
- pred = (int) (((Q11<<7) - num) / (Q11<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q11 << 7) - num) / (Q11 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
pred = -pred;
}
- workspace[9] = (JCOEF) pred;
+ workspace[9] = (JCOEF)pred;
}
/* AC02 */
- if ((Al=coef_bits[5]) != 0 && workspace[2] == 0) {
- num = 9 * Q00 * (DC4 + DC6 - 2*DC5);
+ if ((Al = coef_bits[5]) != 0 && workspace[2] == 0) {
+ num = Q00 * (change_dc ?
+ (2 * DC07 - 5 * DC08 + 2 * DC09 + DC11 + 7 * DC12 - 14 * DC13 +
+ 7 * DC14 + DC15 + 2 * DC17 - 5 * DC18 + 2 * DC19) :
+ (-DC11 + 13 * DC12 - 24 * DC13 + 13 * DC14 - DC15));
if (num >= 0) {
- pred = (int) (((Q02<<7) + num) / (Q02<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q02 << 7) + num) / (Q02 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
} else {
- pred = (int) (((Q02<<7) - num) / (Q02<<8));
- if (Al > 0 && pred >= (1<<Al))
- pred = (1<<Al)-1;
+ pred = (int)(((Q02 << 7) - num) / (Q02 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
pred = -pred;
}
- workspace[2] = (JCOEF) pred;
+ workspace[2] = (JCOEF)pred;
}
+ if (change_dc) {
+ /* AC03 */
+ if ((Al = coef_bits[6]) != 0 && workspace[3] == 0) {
+ num = Q00 * (DC07 - DC09 + 2 * DC12 - 2 * DC14 + DC17 - DC19);
+ if (num >= 0) {
+ pred = (int)(((Q03 << 7) + num) / (Q03 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ } else {
+ pred = (int)(((Q03 << 7) - num) / (Q03 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ pred = -pred;
+ }
+ workspace[3] = (JCOEF)pred;
+ }
+ /* AC12 */
+ if ((Al = coef_bits[7]) != 0 && workspace[10] == 0) {
+ num = Q00 * (DC07 - 3 * DC08 + DC09 - DC17 + 3 * DC18 - DC19);
+ if (num >= 0) {
+ pred = (int)(((Q12 << 7) + num) / (Q12 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ } else {
+ pred = (int)(((Q12 << 7) - num) / (Q12 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ pred = -pred;
+ }
+ workspace[10] = (JCOEF)pred;
+ }
+ /* AC21 */
+ if ((Al = coef_bits[8]) != 0 && workspace[17] == 0) {
+ num = Q00 * (DC07 - DC09 - 3 * DC12 + 3 * DC14 + DC17 - DC19);
+ if (num >= 0) {
+ pred = (int)(((Q21 << 7) + num) / (Q21 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ } else {
+ pred = (int)(((Q21 << 7) - num) / (Q21 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ pred = -pred;
+ }
+ workspace[17] = (JCOEF)pred;
+ }
+ /* AC30 */
+ if ((Al = coef_bits[9]) != 0 && workspace[24] == 0) {
+ num = Q00 * (DC07 + 2 * DC08 + DC09 - DC17 - 2 * DC18 - DC19);
+ if (num >= 0) {
+ pred = (int)(((Q30 << 7) + num) / (Q30 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ } else {
+ pred = (int)(((Q30 << 7) - num) / (Q30 << 8));
+ if (Al > 0 && pred >= (1 << Al))
+ pred = (1 << Al) - 1;
+ pred = -pred;
+ }
+ workspace[24] = (JCOEF)pred;
+ }
+ /* coef_bits[0] is non-negative. Otherwise this function would not
+ * be called.
+ */
+ num = Q00 *
+ (-2 * DC01 - 6 * DC02 - 8 * DC03 - 6 * DC04 - 2 * DC05 -
+ 6 * DC06 + 6 * DC07 + 42 * DC08 + 6 * DC09 - 6 * DC10 -
+ 8 * DC11 + 42 * DC12 + 152 * DC13 + 42 * DC14 - 8 * DC15 -
+ 6 * DC16 + 6 * DC17 + 42 * DC18 + 6 * DC19 - 6 * DC20 -
+ 2 * DC21 - 6 * DC22 - 8 * DC23 - 6 * DC24 - 2 * DC25);
+ if (num >= 0) {
+ pred = (int)(((Q00 << 7) + num) / (Q00 << 8));
+ } else {
+ pred = (int)(((Q00 << 7) - num) / (Q00 << 8));
+ pred = -pred;
+ }
+ workspace[0] = (JCOEF)pred;
+ } /* change_dc */
+
/* OK, do the IDCT */
- (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) workspace,
- output_ptr, output_col);
+ (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)workspace, output_ptr,
+ output_col);
/* Advance for next column */
- DC1 = DC2; DC2 = DC3;
- DC4 = DC5; DC5 = DC6;
- DC7 = DC8; DC8 = DC9;
- buffer_ptr++, prev_block_row++, next_block_row++;
+ DC01 = DC02; DC02 = DC03; DC03 = DC04; DC04 = DC05;
+ DC06 = DC07; DC07 = DC08; DC08 = DC09; DC09 = DC10;
+ DC11 = DC12; DC12 = DC13; DC13 = DC14; DC14 = DC15;
+ DC16 = DC17; DC17 = DC18; DC18 = DC19; DC19 = DC20;
+ DC21 = DC22; DC22 = DC23; DC23 = DC24; DC24 = DC25;
+ buffer_ptr++, prev_block_row++, next_block_row++,
+ prev_prev_block_row++, next_next_block_row++;
output_col += compptr->_DCT_scaled_size;
}
output_ptr += compptr->_DCT_scaled_size;
*/
GLOBAL(void)
-jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
+jinit_d_coef_controller(j_decompress_ptr cinfo, boolean need_full_buffer)
{
my_coef_ptr coef;
coef = (my_coef_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
sizeof(my_coef_controller));
- cinfo->coef = (struct jpeg_d_coef_controller *) coef;
+ cinfo->coef = (struct jpeg_d_coef_controller *)coef;
coef->pub.start_input_pass = start_input_pass;
coef->pub.start_output_pass = start_output_pass;
#ifdef BLOCK_SMOOTHING_SUPPORTED
#ifdef BLOCK_SMOOTHING_SUPPORTED
/* If block smoothing could be used, need a bigger window */
if (cinfo->progressive_mode)
- access_rows *= 3;
+ access_rows *= 5;
#endif
coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
- ((j_common_ptr) cinfo, JPOOL_IMAGE, TRUE,
- (JDIMENSION) jround_up((long) compptr->width_in_blocks,
- (long) compptr->h_samp_factor),
- (JDIMENSION) jround_up((long) compptr->height_in_blocks,
- (long) compptr->v_samp_factor),
- (JDIMENSION) access_rows);
+ ((j_common_ptr)cinfo, JPOOL_IMAGE, TRUE,
+ (JDIMENSION)jround_up((long)compptr->width_in_blocks,
+ (long)compptr->h_samp_factor),
+ (JDIMENSION)jround_up((long)compptr->height_in_blocks,
+ (long)compptr->v_samp_factor),
+ (JDIMENSION)access_rows);
}
coef->pub.consume_data = consume_data;
coef->pub.decompress_data = decompress_data;
int i;
buffer = (JBLOCKROW)
- (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ (*cinfo->mem->alloc_large) ((j_common_ptr)cinfo, JPOOL_IMAGE,
D_MAX_BLOCKS_IN_MCU * sizeof(JBLOCK));
for (i = 0; i < D_MAX_BLOCKS_IN_MCU; i++) {
coef->MCU_buffer[i] = buffer + i;
/* Allocate the workspace buffer */
coef->workspace = (JCOEF *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
sizeof(JCOEF) * DCTSIZE2);
}
projects / platform / upstream / libjpeg-turbo.git / blobdiff