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Diffstat (limited to '3rdparty/libjpeg/jccoefct.c')
-rw-r--r--3rdparty/libjpeg/jccoefct.c148
1 files changed, 75 insertions, 73 deletions
diff --git a/3rdparty/libjpeg/jccoefct.c b/3rdparty/libjpeg/jccoefct.c
index 924a703dda2..77851f390e1 100644
--- a/3rdparty/libjpeg/jccoefct.c
+++ b/3rdparty/libjpeg/jccoefct.c
@@ -2,7 +2,7 @@
* jccoefct.c
*
* Copyright (C) 1994-1997, Thomas G. Lane.
- * Modified 2003-2011 by Guido Vollbeding.
+ * Modified 2003-2020 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -36,16 +36,14 @@ typedef struct {
struct jpeg_c_coef_controller pub; /* public fields */
JDIMENSION iMCU_row_num; /* iMCU row # within image */
- JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
+ JDIMENSION MCU_ctr; /* counts MCUs processed in current row */
int MCU_vert_offset; /* counts MCU rows within iMCU row */
int MCU_rows_per_iMCU_row; /* number of such rows needed */
/* For single-pass compression, it's sufficient to buffer just one MCU
- * (although this may prove a bit slow in practice). We allocate a
- * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
- * MCU constructed and sent. (On 80x86, the workspace is FAR even though
- * it's not really very big; this is to keep the module interfaces unchanged
- * when a large coefficient buffer is necessary.)
+ * (although this may prove a bit slow in practice). We append a
+ * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it
+ * for each MCU constructed and sent.
* In multi-pass modes, this array points to the current MCU's blocks
* within the virtual arrays.
*/
@@ -53,6 +51,9 @@ typedef struct {
/* In multi-pass modes, we need a virtual block array for each component. */
jvirt_barray_ptr whole_image[MAX_COMPONENTS];
+
+ /* Workspace for single-pass compression (omitted otherwise). */
+ JBLOCK blk_buffer[C_MAX_BLOCKS_IN_MCU];
} my_coef_controller;
typedef my_coef_controller * my_coef_ptr;
@@ -88,7 +89,7 @@ start_iMCU_row (j_compress_ptr cinfo)
coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
}
- coef->mcu_ctr = 0;
+ coef->MCU_ctr = 0;
coef->MCU_vert_offset = 0;
}
@@ -125,7 +126,6 @@ start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
#endif
default:
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
- break;
}
}
@@ -147,59 +147,56 @@ compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
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;
- int blkn, bi, ci, yindex, yoffset, blockcnt;
- JDIMENSION ypos, xpos;
+ int ci, xindex, yindex, yoffset, blockcnt;
+ JBLOCKROW blkp;
+ JSAMPARRAY input_ptr;
+ JDIMENSION xpos;
jpeg_component_info *compptr;
forward_DCT_ptr forward_DCT;
/* Loop to write as much as one whole iMCU row */
for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
yoffset++) {
- for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col;
+ for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col;
MCU_col_num++) {
/* Determine where data comes from in input_buf and do the DCT thing.
- * Each call on forward_DCT processes a horizontal row of DCT blocks
- * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
- * sequentially. Dummy blocks at the right or bottom edge are filled in
+ * Each call on forward_DCT processes a horizontal row of DCT blocks as
+ * wide as an MCU. Dummy blocks at the right or bottom edge are filled in
* specially. The data in them does not matter for image reconstruction,
* so we fill them with values that will encode to the smallest amount of
* data, viz: all zeroes in the AC entries, DC entries equal to previous
* block's DC value. (Thanks to Thomas Kinsman for this idea.)
*/
- blkn = 0;
+ blkp = coef->blk_buffer; /* pointer to current DCT block within MCU */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
forward_DCT = cinfo->fdct->forward_DCT[compptr->component_index];
+ input_ptr = input_buf[compptr->component_index] +
+ yoffset * compptr->DCT_v_scaled_size;
+ /* ypos == (yoffset + yindex) * compptr->DCT_v_scaled_size */
blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
: compptr->last_col_width;
xpos = MCU_col_num * compptr->MCU_sample_width;
- ypos = yoffset * compptr->DCT_v_scaled_size;
- /* ypos == (yoffset+yindex) * DCTSIZE */
for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
if (coef->iMCU_row_num < last_iMCU_row ||
- yoffset+yindex < compptr->last_row_height) {
- (*forward_DCT) (cinfo, compptr,
- input_buf[compptr->component_index],
- coef->MCU_buffer[blkn],
- ypos, xpos, (JDIMENSION) blockcnt);
- if (blockcnt < compptr->MCU_width) {
- /* Create some dummy blocks at the right edge of the image. */
- FMEMZERO((void FAR *) coef->MCU_buffer[blkn + blockcnt],
- (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK));
- for (bi = blockcnt; bi < compptr->MCU_width; bi++) {
- coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0];
- }
- }
+ yoffset + yindex < compptr->last_row_height) {
+ (*forward_DCT) (cinfo, compptr, input_ptr, blkp,
+ xpos, (JDIMENSION) blockcnt);
+ input_ptr += compptr->DCT_v_scaled_size;
+ blkp += blockcnt;
+ /* Dummy blocks at right edge */
+ if ((xindex = compptr->MCU_width - blockcnt) == 0)
+ continue;
} else {
- /* Create a row of dummy blocks at the bottom of the image. */
- FMEMZERO((void FAR *) coef->MCU_buffer[blkn],
- compptr->MCU_width * SIZEOF(JBLOCK));
- for (bi = 0; bi < compptr->MCU_width; bi++) {
- coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0];
- }
+ /* At bottom of image, need a whole row of dummy blocks */
+ xindex = compptr->MCU_width;
}
- blkn += compptr->MCU_width;
- ypos += compptr->DCT_v_scaled_size;
+ /* Fill in any dummy blocks needed in this row */
+ MEMZERO(blkp, xindex * SIZEOF(JBLOCK));
+ do {
+ blkp[0][0] = blkp[-1][0];
+ blkp++;
+ } while (--xindex);
}
}
/* Try to write the MCU. In event of a suspension failure, we will
@@ -208,12 +205,12 @@ compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
/* Suspension forced; update state counters and exit */
coef->MCU_vert_offset = yoffset;
- coef->mcu_ctr = MCU_col_num;
+ coef->MCU_ctr = MCU_col_num;
return FALSE;
}
}
/* Completed an MCU row, but perhaps not an iMCU row */
- coef->mcu_ctr = 0;
+ coef->MCU_ctr = 0;
}
/* Completed the iMCU row, advance counters for next one */
coef->iMCU_row_num++;
@@ -256,6 +253,7 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
jpeg_component_info *compptr;
JBLOCKARRAY buffer;
JBLOCKROW thisblockrow, lastblockrow;
+ JSAMPARRAY input_ptr;
forward_DCT_ptr forward_DCT;
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
@@ -280,14 +278,15 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
if (ndummy > 0)
ndummy = h_samp_factor - ndummy;
forward_DCT = cinfo->fdct->forward_DCT[ci];
+ input_ptr = input_buf[ci];
/* Perform DCT for all non-dummy blocks in this iMCU row. Each call
* on forward_DCT processes a complete horizontal row of DCT blocks.
*/
for (block_row = 0; block_row < block_rows; block_row++) {
thisblockrow = buffer[block_row];
- (*forward_DCT) (cinfo, compptr, input_buf[ci], thisblockrow,
- (JDIMENSION) (block_row * compptr->DCT_v_scaled_size),
+ (*forward_DCT) (cinfo, compptr, input_ptr, thisblockrow,
(JDIMENSION) 0, blocks_across);
+ input_ptr += compptr->DCT_v_scaled_size;
if (ndummy > 0) {
/* Create dummy blocks at the right edge of the image. */
thisblockrow += blocks_across; /* => first dummy block */
@@ -303,15 +302,14 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
* of the dummy blocks to match the last real block's DC value.
* This squeezes a few more bytes out of the resulting file...
*/
- if (coef->iMCU_row_num == last_iMCU_row) {
+ if (block_row < compptr->v_samp_factor) {
blocks_across += ndummy; /* include lower right corner */
MCUs_across = blocks_across / h_samp_factor;
- for (block_row = block_rows; block_row < compptr->v_samp_factor;
- block_row++) {
+ do {
thisblockrow = buffer[block_row];
lastblockrow = buffer[block_row-1];
FMEMZERO((void FAR *) thisblockrow,
- (size_t) (blocks_across * SIZEOF(JBLOCK)));
+ (size_t) blocks_across * SIZEOF(JBLOCK));
for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) {
lastDC = lastblockrow[h_samp_factor-1][0];
for (bi = 0; bi < h_samp_factor; bi++) {
@@ -320,7 +318,7 @@ compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
thisblockrow += h_samp_factor; /* advance to next MCU in row */
lastblockrow += h_samp_factor;
}
- }
+ } while (++block_row < compptr->v_samp_factor);
}
}
/* NB: compress_output will increment iMCU_row_num if successful.
@@ -347,8 +345,9 @@ compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
{
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;
+ int ci, xindex, yindex, yoffset;
JDIMENSION start_col;
+ JBLOCKARRAY blkp;
JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
JBLOCKROW buffer_ptr;
jpeg_component_info *compptr;
@@ -368,30 +367,31 @@ compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
/* Loop to process one whole iMCU row */
for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
yoffset++) {
- for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
+ for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row;
MCU_col_num++) {
/* Construct list of pointers to DCT blocks belonging to this MCU */
- blkn = 0; /* index of current DCT block within MCU */
+ blkp = coef->MCU_buffer; /* pointer to current DCT block within MCU */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
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;
- for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
- coef->MCU_buffer[blkn++] = buffer_ptr++;
- }
+ buffer_ptr = buffer[ci][yoffset + yindex] + start_col;
+ xindex = compptr->MCU_width;
+ do {
+ *blkp++ = buffer_ptr++;
+ } while (--xindex);
}
}
/* Try to write the MCU. */
if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
/* Suspension forced; update state counters and exit */
coef->MCU_vert_offset = yoffset;
- coef->mcu_ctr = MCU_col_num;
+ coef->MCU_ctr = MCU_col_num;
return FALSE;
}
}
/* Completed an MCU row, but perhaps not an iMCU row */
- coef->mcu_ctr = 0;
+ coef->MCU_ctr = 0;
}
/* Completed the iMCU row, advance counters for next one */
coef->iMCU_row_num++;
@@ -411,13 +411,6 @@ jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
{
my_coef_ptr coef;
- coef = (my_coef_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(my_coef_controller));
- cinfo->coef = (struct jpeg_c_coef_controller *) coef;
- coef->pub.start_pass = start_pass_coef;
-
- /* Create the coefficient buffer. */
if (need_full_buffer) {
#ifdef FULL_COEF_BUFFER_SUPPORTED
/* Allocate a full-image virtual array for each component, */
@@ -425,6 +418,9 @@ jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
int ci;
jpeg_component_info *compptr;
+ coef = (my_coef_ptr) (*cinfo->mem->alloc_small)
+ ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ SIZEOF(my_coef_controller) - SIZEOF(coef->blk_buffer));
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
@@ -440,15 +436,21 @@ jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
#endif
} else {
/* We only need a single-MCU buffer. */
- JBLOCKROW buffer;
- int i;
-
- buffer = (JBLOCKROW)
- (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
- for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
- coef->MCU_buffer[i] = buffer + i;
- }
+ JBLOCKARRAY blkp;
+ JBLOCKROW buffer_ptr;
+ int bi;
+
+ coef = (my_coef_ptr) (*cinfo->mem->alloc_small)
+ ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_coef_controller));
+ blkp = coef->MCU_buffer;
+ buffer_ptr = coef->blk_buffer;
+ bi = C_MAX_BLOCKS_IN_MCU;
+ do {
+ *blkp++ = buffer_ptr++;
+ } while (--bi);
coef->whole_image[0] = NULL; /* flag for no virtual arrays */
}
+
+ coef->pub.start_pass = start_pass_coef;
+ cinfo->coef = &coef->pub;
}