This source file includes following definitions.
- GLOBAL
- GLOBAL
- GLOBAL
- LOCAL
- GLOBAL
- GLOBAL
- GLOBAL
- GLOBAL
- GLOBAL
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
GLOBAL(void)
jpeg_CreateDecompress (j_decompress_ptr cinfo, int version, size_t structsize)
{
int i;
cinfo->mem = NULL;
if (version != JPEG_LIB_VERSION)
ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
if (structsize != SIZEOF(struct jpeg_decompress_struct))
ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE,
(int) SIZEOF(struct jpeg_decompress_struct), (int) structsize);
{
struct jpeg_error_mgr * err = cinfo->err;
void * client_data = cinfo->client_data;
MEMZERO(cinfo, SIZEOF(struct jpeg_decompress_struct));
cinfo->err = err;
cinfo->client_data = client_data;
}
cinfo->is_decompressor = TRUE;
jinit_memory_mgr((j_common_ptr) cinfo);
cinfo->progress = NULL;
cinfo->src = NULL;
for (i = 0; i < NUM_QUANT_TBLS; i++)
cinfo->quant_tbl_ptrs[i] = NULL;
for (i = 0; i < NUM_HUFF_TBLS; i++) {
cinfo->dc_huff_tbl_ptrs[i] = NULL;
cinfo->ac_huff_tbl_ptrs[i] = NULL;
}
cinfo->marker_list = NULL;
jinit_marker_reader(cinfo);
jinit_input_controller(cinfo);
cinfo->global_state = DSTATE_START;
}
GLOBAL(void)
jpeg_destroy_decompress (j_decompress_ptr cinfo)
{
jpeg_destroy((j_common_ptr) cinfo);
}
GLOBAL(void)
jpeg_abort_decompress (j_decompress_ptr cinfo)
{
jpeg_abort((j_common_ptr) cinfo);
}
LOCAL(void)
default_decompress_parms (j_decompress_ptr cinfo)
{
switch (cinfo->num_components) {
case 1:
cinfo->jpeg_color_space = JCS_GRAYSCALE;
cinfo->out_color_space = JCS_GRAYSCALE;
break;
case 3:
if (cinfo->saw_JFIF_marker) {
cinfo->jpeg_color_space = JCS_YCbCr;
} else if (cinfo->saw_Adobe_marker) {
switch (cinfo->Adobe_transform) {
case 0:
cinfo->jpeg_color_space = JCS_RGB;
break;
case 1:
cinfo->jpeg_color_space = JCS_YCbCr;
break;
default:
WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
cinfo->jpeg_color_space = JCS_YCbCr;
break;
}
} else {
int cid0 = cinfo->comp_info[0].component_id;
int cid1 = cinfo->comp_info[1].component_id;
int cid2 = cinfo->comp_info[2].component_id;
if (cid0 == 1 && cid1 == 2 && cid2 == 3)
cinfo->jpeg_color_space = JCS_YCbCr;
else if (cid0 == 82 && cid1 == 71 && cid2 == 66)
cinfo->jpeg_color_space = JCS_RGB;
else {
TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2);
cinfo->jpeg_color_space = JCS_YCbCr;
}
}
cinfo->out_color_space = JCS_RGB;
break;
case 4:
if (cinfo->saw_Adobe_marker) {
switch (cinfo->Adobe_transform) {
case 0:
cinfo->jpeg_color_space = JCS_CMYK;
break;
case 2:
cinfo->jpeg_color_space = JCS_YCCK;
break;
default:
WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform);
cinfo->jpeg_color_space = JCS_YCCK;
break;
}
} else {
cinfo->jpeg_color_space = JCS_CMYK;
}
cinfo->out_color_space = JCS_CMYK;
break;
default:
cinfo->jpeg_color_space = JCS_UNKNOWN;
cinfo->out_color_space = JCS_UNKNOWN;
break;
}
cinfo->scale_num = 1;
cinfo->scale_denom = 1;
cinfo->output_gamma = 1.0;
cinfo->buffered_image = FALSE;
cinfo->raw_data_out = FALSE;
cinfo->dct_method = JDCT_DEFAULT;
cinfo->do_fancy_upsampling = TRUE;
cinfo->do_block_smoothing = TRUE;
cinfo->quantize_colors = FALSE;
cinfo->dither_mode = JDITHER_FS;
#ifdef QUANT_2PASS_SUPPORTED
cinfo->two_pass_quantize = TRUE;
#else
cinfo->two_pass_quantize = FALSE;
#endif
cinfo->desired_number_of_colors = 256;
cinfo->colormap = NULL;
cinfo->enable_1pass_quant = FALSE;
cinfo->enable_external_quant = FALSE;
cinfo->enable_2pass_quant = FALSE;
}
GLOBAL(int)
jpeg_read_header (j_decompress_ptr cinfo, boolean require_image)
{
int retcode;
if (cinfo->global_state != DSTATE_START &&
cinfo->global_state != DSTATE_INHEADER)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
retcode = jpeg_consume_input(cinfo);
switch (retcode) {
case JPEG_REACHED_SOS:
retcode = JPEG_HEADER_OK;
break;
case JPEG_REACHED_EOI:
if (require_image)
ERREXIT(cinfo, JERR_NO_IMAGE);
jpeg_abort((j_common_ptr) cinfo);
retcode = JPEG_HEADER_TABLES_ONLY;
break;
case JPEG_SUSPENDED:
break;
}
return retcode;
}
GLOBAL(int)
jpeg_consume_input (j_decompress_ptr cinfo)
{
int retcode = JPEG_SUSPENDED;
switch (cinfo->global_state) {
case DSTATE_START:
(*cinfo->inputctl->reset_input_controller) (cinfo);
(*cinfo->src->init_source) (cinfo);
cinfo->global_state = DSTATE_INHEADER;
case DSTATE_INHEADER:
retcode = (*cinfo->inputctl->consume_input) (cinfo);
if (retcode == JPEG_REACHED_SOS) {
default_decompress_parms(cinfo);
cinfo->global_state = DSTATE_READY;
}
break;
case DSTATE_READY:
retcode = JPEG_REACHED_SOS;
break;
case DSTATE_PRELOAD:
case DSTATE_PRESCAN:
case DSTATE_SCANNING:
case DSTATE_RAW_OK:
case DSTATE_BUFIMAGE:
case DSTATE_BUFPOST:
case DSTATE_STOPPING:
retcode = (*cinfo->inputctl->consume_input) (cinfo);
break;
default:
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
}
return retcode;
}
GLOBAL(boolean)
jpeg_input_complete (j_decompress_ptr cinfo)
{
if (cinfo->global_state < DSTATE_START ||
cinfo->global_state > DSTATE_STOPPING)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
return cinfo->inputctl->eoi_reached;
}
GLOBAL(boolean)
jpeg_has_multiple_scans (j_decompress_ptr cinfo)
{
if (cinfo->global_state < DSTATE_READY ||
cinfo->global_state > DSTATE_STOPPING)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
return cinfo->inputctl->has_multiple_scans;
}
GLOBAL(boolean)
jpeg_finish_decompress (j_decompress_ptr cinfo)
{
if ((cinfo->global_state == DSTATE_SCANNING ||
cinfo->global_state == DSTATE_RAW_OK) && ! cinfo->buffered_image) {
if (cinfo->output_scanline < cinfo->output_height)
ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
(*cinfo->master->finish_output_pass) (cinfo);
cinfo->global_state = DSTATE_STOPPING;
} else if (cinfo->global_state == DSTATE_BUFIMAGE) {
cinfo->global_state = DSTATE_STOPPING;
} else if (cinfo->global_state != DSTATE_STOPPING) {
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
}
while (! cinfo->inputctl->eoi_reached) {
if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
return FALSE;
}
(*cinfo->src->term_source) (cinfo);
jpeg_abort((j_common_ptr) cinfo);
return TRUE;
}