#include "jinclude.h"
#include "jdmainct.h"
#include "jdcoefct.h"
#include "jdmaster.h"
#include "jdmerge.h"
#include "jdsample.h"
#include "jmemsys.h"
LOCAL(boolean) output_pass_setup(j_decompress_ptr cinfo);
GLOBAL(boolean)
jpeg_start_decompress(j_decompress_ptr cinfo)
{
if (cinfo->global_state == DSTATE_READY) {
jinit_master_decompress(cinfo);
if (cinfo->buffered_image) {
cinfo->global_state = DSTATE_BUFIMAGE;
return TRUE;
}
cinfo->global_state = DSTATE_PRELOAD;
}
if (cinfo->global_state == DSTATE_PRELOAD) {
if (cinfo->inputctl->has_multiple_scans) {
#ifdef D_MULTISCAN_FILES_SUPPORTED
for (;;) {
int retcode;
if (cinfo->progress != NULL)
(*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
retcode = (*cinfo->inputctl->consume_input) (cinfo);
if (retcode == JPEG_SUSPENDED)
return FALSE;
if (retcode == JPEG_REACHED_EOI)
break;
if (cinfo->progress != NULL &&
(retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
cinfo->progress->pass_limit += (long)cinfo->total_iMCU_rows;
}
}
}
#else
ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
}
cinfo->output_scan_number = cinfo->input_scan_number;
} else if (cinfo->global_state != DSTATE_PRESCAN)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
return output_pass_setup(cinfo);
}
LOCAL(boolean)
output_pass_setup(j_decompress_ptr cinfo)
{
if (cinfo->global_state != DSTATE_PRESCAN) {
(*cinfo->master->prepare_for_output_pass) (cinfo);
cinfo->output_scanline = 0;
cinfo->global_state = DSTATE_PRESCAN;
}
while (cinfo->master->is_dummy_pass) {
#ifdef QUANT_2PASS_SUPPORTED
while (cinfo->output_scanline < cinfo->output_height) {
JDIMENSION last_scanline;
if (cinfo->progress != NULL) {
cinfo->progress->pass_counter = (long)cinfo->output_scanline;
cinfo->progress->pass_limit = (long)cinfo->output_height;
(*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
}
last_scanline = cinfo->output_scanline;
(*cinfo->main->process_data) (cinfo, (JSAMPARRAY)NULL,
&cinfo->output_scanline, (JDIMENSION)0);
if (cinfo->output_scanline == last_scanline)
return FALSE;
}
(*cinfo->master->finish_output_pass) (cinfo);
(*cinfo->master->prepare_for_output_pass) (cinfo);
cinfo->output_scanline = 0;
#else
ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
}
cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING;
return TRUE;
}
GLOBAL(void)
jpeg_crop_scanline(j_decompress_ptr cinfo, JDIMENSION *xoffset,
JDIMENSION *width)
{
int ci, align, orig_downsampled_width;
JDIMENSION input_xoffset;
boolean reinit_upsampler = FALSE;
jpeg_component_info *compptr;
if (cinfo->global_state != DSTATE_SCANNING || cinfo->output_scanline != 0)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (!xoffset || !width)
ERREXIT(cinfo, JERR_BAD_CROP_SPEC);
if (*width == 0 || *xoffset + *width > cinfo->output_width)
ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
if (*width == cinfo->output_width)
return;
if (cinfo->comps_in_scan == 1 && cinfo->num_components == 1)
align = cinfo->_min_DCT_scaled_size;
else
align = cinfo->_min_DCT_scaled_size * cinfo->max_h_samp_factor;
input_xoffset = *xoffset;
*xoffset = (input_xoffset / align) * align;
*width = *width + input_xoffset - *xoffset;
cinfo->output_width = *width;
cinfo->master->first_iMCU_col = (JDIMENSION)(long)(*xoffset) / (long)align;
cinfo->master->last_iMCU_col =
(JDIMENSION)jdiv_round_up((long)(*xoffset + cinfo->output_width),
(long)align) - 1;
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
int hsf = (cinfo->comps_in_scan == 1 && cinfo->num_components == 1) ?
1 : compptr->h_samp_factor;
orig_downsampled_width = compptr->downsampled_width;
compptr->downsampled_width =
(JDIMENSION)jdiv_round_up((long)(cinfo->output_width *
compptr->h_samp_factor),
(long)cinfo->max_h_samp_factor);
if (compptr->downsampled_width < 2 && orig_downsampled_width >= 2)
reinit_upsampler = TRUE;
cinfo->master->first_MCU_col[ci] =
(JDIMENSION)(long)(*xoffset * hsf) / (long)align;
cinfo->master->last_MCU_col[ci] =
(JDIMENSION)jdiv_round_up((long)((*xoffset + cinfo->output_width) * hsf),
(long)align) - 1;
}
if (reinit_upsampler) {
cinfo->master->jinit_upsampler_no_alloc = TRUE;
jinit_upsampler(cinfo);
cinfo->master->jinit_upsampler_no_alloc = FALSE;
}
}
GLOBAL(JDIMENSION)
jpeg_read_scanlines(j_decompress_ptr cinfo, JSAMPARRAY scanlines,
JDIMENSION max_lines)
{
JDIMENSION row_ctr;
if (cinfo->global_state != DSTATE_SCANNING)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (cinfo->output_scanline >= cinfo->output_height) {
WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
return 0;
}
if (cinfo->progress != NULL) {
cinfo->progress->pass_counter = (long)cinfo->output_scanline;
cinfo->progress->pass_limit = (long)cinfo->output_height;
(*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
}
row_ctr = 0;
(*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines);
cinfo->output_scanline += row_ctr;
return row_ctr;
}
LOCAL(void)
noop_convert(j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows)
{
}
LOCAL(void)
noop_quantize(j_decompress_ptr cinfo, JSAMPARRAY input_buf,
JSAMPARRAY output_buf, int num_rows)
{
}
LOCAL(void)
read_and_discard_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
{
JDIMENSION n;
my_master_ptr master = (my_master_ptr)cinfo->master;
JSAMPARRAY scanlines = NULL;
void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION input_row, JSAMPARRAY output_buf,
int num_rows) = NULL;
void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
JSAMPARRAY output_buf, int num_rows) = NULL;
if (cinfo->cconvert && cinfo->cconvert->color_convert) {
color_convert = cinfo->cconvert->color_convert;
cinfo->cconvert->color_convert = noop_convert;
}
if (cinfo->cquantize && cinfo->cquantize->color_quantize) {
color_quantize = cinfo->cquantize->color_quantize;
cinfo->cquantize->color_quantize = noop_quantize;
}
if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
my_merged_upsample_ptr upsample = (my_merged_upsample_ptr)cinfo->upsample;
scanlines = &upsample->spare_row;
}
for (n = 0; n < num_lines; n++)
jpeg_read_scanlines(cinfo, scanlines, 1);
if (color_convert)
cinfo->cconvert->color_convert = color_convert;
if (color_quantize)
cinfo->cquantize->color_quantize = color_quantize;
}
LOCAL(void)
increment_simple_rowgroup_ctr(j_decompress_ptr cinfo, JDIMENSION rows)
{
JDIMENSION rows_left;
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
my_master_ptr master = (my_master_ptr)cinfo->master;
if (master->using_merged_upsample && cinfo->max_v_samp_factor == 2) {
read_and_discard_scanlines(cinfo, rows);
return;
}
main_ptr->rowgroup_ctr += rows / cinfo->max_v_samp_factor;
rows_left = rows % cinfo->max_v_samp_factor;
cinfo->output_scanline += rows - rows_left;
read_and_discard_scanlines(cinfo, rows_left);
}
GLOBAL(JDIMENSION)
jpeg_skip_scanlines(j_decompress_ptr cinfo, JDIMENSION num_lines)
{
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
my_coef_ptr coef = (my_coef_ptr)cinfo->coef;
my_master_ptr master = (my_master_ptr)cinfo->master;
my_upsample_ptr upsample = (my_upsample_ptr)cinfo->upsample;
JDIMENSION i, x;
int y;
JDIMENSION lines_per_iMCU_row, lines_left_in_iMCU_row, lines_after_iMCU_row;
JDIMENSION lines_to_skip, lines_to_read;
if (cinfo->quantize_colors && cinfo->two_pass_quantize)
ERREXIT(cinfo, JERR_NOTIMPL);
if (cinfo->global_state != DSTATE_SCANNING)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (cinfo->output_scanline + num_lines >= cinfo->output_height) {
num_lines = cinfo->output_height - cinfo->output_scanline;
cinfo->output_scanline = cinfo->output_height;
(*cinfo->inputctl->finish_input_pass) (cinfo);
cinfo->inputctl->eoi_reached = TRUE;
return num_lines;
}
if (num_lines == 0)
return 0;
lines_per_iMCU_row = cinfo->_min_DCT_scaled_size * cinfo->max_v_samp_factor;
lines_left_in_iMCU_row =
(lines_per_iMCU_row - (cinfo->output_scanline % lines_per_iMCU_row)) %
lines_per_iMCU_row;
lines_after_iMCU_row = num_lines - lines_left_in_iMCU_row;
if (cinfo->upsample->need_context_rows) {
if ((num_lines < lines_left_in_iMCU_row + 1) ||
(lines_left_in_iMCU_row <= 1 && main_ptr->buffer_full &&
lines_after_iMCU_row < lines_per_iMCU_row + 1)) {
read_and_discard_scanlines(cinfo, num_lines);
return num_lines;
}
if (lines_left_in_iMCU_row <= 1 && main_ptr->buffer_full) {
cinfo->output_scanline += lines_left_in_iMCU_row + lines_per_iMCU_row;
lines_after_iMCU_row -= lines_per_iMCU_row;
} else {
cinfo->output_scanline += lines_left_in_iMCU_row;
}
if (main_ptr->iMCU_row_ctr == 0 ||
(main_ptr->iMCU_row_ctr == 1 && lines_left_in_iMCU_row > 2))
set_wraparound_pointers(cinfo);
main_ptr->buffer_full = FALSE;
main_ptr->rowgroup_ctr = 0;
main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
if (!master->using_merged_upsample) {
upsample->next_row_out = cinfo->max_v_samp_factor;
upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
}
}
else {
if (num_lines < lines_left_in_iMCU_row) {
increment_simple_rowgroup_ctr(cinfo, num_lines);
return num_lines;
} else {
cinfo->output_scanline += lines_left_in_iMCU_row;
main_ptr->buffer_full = FALSE;
main_ptr->rowgroup_ctr = 0;
if (!master->using_merged_upsample) {
upsample->next_row_out = cinfo->max_v_samp_factor;
upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
}
}
}
if (cinfo->upsample->need_context_rows)
lines_to_skip = ((lines_after_iMCU_row - 1) / lines_per_iMCU_row) *
lines_per_iMCU_row;
else
lines_to_skip = (lines_after_iMCU_row / lines_per_iMCU_row) *
lines_per_iMCU_row;
lines_to_read = lines_after_iMCU_row - lines_to_skip;
if (cinfo->inputctl->has_multiple_scans) {
if (cinfo->upsample->need_context_rows) {
cinfo->output_scanline += lines_to_skip;
cinfo->output_iMCU_row += lines_to_skip / lines_per_iMCU_row;
main_ptr->iMCU_row_ctr += lines_to_skip / lines_per_iMCU_row;
read_and_discard_scanlines(cinfo, lines_to_read);
} else {
cinfo->output_scanline += lines_to_skip;
cinfo->output_iMCU_row += lines_to_skip / lines_per_iMCU_row;
increment_simple_rowgroup_ctr(cinfo, lines_to_read);
}
if (!master->using_merged_upsample)
upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
return num_lines;
}
for (i = 0; i < lines_to_skip; i += lines_per_iMCU_row) {
for (y = 0; y < coef->MCU_rows_per_iMCU_row; y++) {
for (x = 0; x < cinfo->MCUs_per_row; x++) {
(*cinfo->entropy->decode_mcu) (cinfo, NULL);
}
}
cinfo->input_iMCU_row++;
cinfo->output_iMCU_row++;
if (cinfo->input_iMCU_row < cinfo->total_iMCU_rows)
start_iMCU_row(cinfo);
else
(*cinfo->inputctl->finish_input_pass) (cinfo);
}
cinfo->output_scanline += lines_to_skip;
if (cinfo->upsample->need_context_rows) {
main_ptr->iMCU_row_ctr += lines_to_skip / lines_per_iMCU_row;
read_and_discard_scanlines(cinfo, lines_to_read);
} else {
increment_simple_rowgroup_ctr(cinfo, lines_to_read);
}
if (!master->using_merged_upsample)
upsample->rows_to_go = cinfo->output_height - cinfo->output_scanline;
return num_lines;
}
GLOBAL(JDIMENSION)
jpeg_read_raw_data(j_decompress_ptr cinfo, JSAMPIMAGE data,
JDIMENSION max_lines)
{
JDIMENSION lines_per_iMCU_row;
if (cinfo->global_state != DSTATE_RAW_OK)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (cinfo->output_scanline >= cinfo->output_height) {
WARNMS(cinfo, JWRN_TOO_MUCH_DATA);
return 0;
}
if (cinfo->progress != NULL) {
cinfo->progress->pass_counter = (long)cinfo->output_scanline;
cinfo->progress->pass_limit = (long)cinfo->output_height;
(*cinfo->progress->progress_monitor) ((j_common_ptr)cinfo);
}
lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->_min_DCT_scaled_size;
if (max_lines < lines_per_iMCU_row)
ERREXIT(cinfo, JERR_BUFFER_SIZE);
if (!(*cinfo->coef->decompress_data) (cinfo, data))
return 0;
cinfo->output_scanline += lines_per_iMCU_row;
return lines_per_iMCU_row;
}
#ifdef D_MULTISCAN_FILES_SUPPORTED
GLOBAL(boolean)
jpeg_start_output(j_decompress_ptr cinfo, int scan_number)
{
if (cinfo->global_state != DSTATE_BUFIMAGE &&
cinfo->global_state != DSTATE_PRESCAN)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (scan_number <= 0)
scan_number = 1;
if (cinfo->inputctl->eoi_reached && scan_number > cinfo->input_scan_number)
scan_number = cinfo->input_scan_number;
cinfo->output_scan_number = scan_number;
return output_pass_setup(cinfo);
}
GLOBAL(boolean)
jpeg_finish_output(j_decompress_ptr cinfo)
{
if ((cinfo->global_state == DSTATE_SCANNING ||
cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) {
(*cinfo->master->finish_output_pass) (cinfo);
cinfo->global_state = DSTATE_BUFPOST;
} else if (cinfo->global_state != DSTATE_BUFPOST) {
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
}
while (cinfo->input_scan_number <= cinfo->output_scan_number &&
!cinfo->inputctl->eoi_reached) {
if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
return FALSE;
}
cinfo->global_state = DSTATE_BUFIMAGE;
return TRUE;
}
#endif