jdinput.c File Reference

#include "jinclude.h"
#include "jpeglib.h"

Data Structures
struct	my_input_controller

Macros
#define	JPEG_INTERNALS

Typedefs
typedef my_input_controller *	my_inputctl_ptr

Functions
	consume_markers (j_decompress_ptr cinfo)
	finish_input_pass (j_decompress_ptr cinfo)
	for (ci=0;ci< cinfo->comps_in_scan;ci++)
	if (cinfo->comps_in_scan==1)
	jinit_input_controller (j_decompress_ptr cinfo)
	latch_quant_tables (j_decompress_ptr cinfo)
	METHODDEF (int)
	reset_input_controller (j_decompress_ptr cinfo)
	start_input_pass (j_decompress_ptr cinfo)

Variables
cinfo	blocks_in_MCU = 0
jpeg_component_info *	compptr
	else
cinfo	MCU_rows_in_scan
cinfo	MCUs_per_row

#define JPEG_INTERNALS

typedef my_input_controller* my_inputctl_ptr

consume_markers

(

j_decompress_ptr

cinfo

)

References jpeg_input_controller::eoi_reached, ERREXIT, FALSE, jpeg_input_controller::has_multiple_scans, if(), my_input_controller::inheaders, JPEG_REACHED_EOI, JPEG_REACHED_SOS, JPEG_SUSPENDED, my_input_controller::pub, start_input_pass(), TRUE, and val.

Referenced by finish_input_pass(), jinit_input_controller(), and reset_input_controller().

finish_input_pass

(

j_decompress_ptr

cinfo

)

References consume_markers().

Referenced by jinit_input_controller().

for

(

ci

= 0; ci < cinfo->comps_in_scan; ci++

)

References ci, D_MAX_BLOCKS_IN_MCU, jpeg_component_info::DCT_scaled_size, ERREXIT, jpeg_component_info::h_samp_factor, jpeg_component_info::height_in_blocks, jpeg_component_info::last_col_width, jpeg_component_info::last_row_height, jpeg_component_info::MCU_blocks, jpeg_component_info::MCU_height, jpeg_component_info::MCU_sample_width, jpeg_component_info::MCU_width, tmp, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks.

if

(

cinfo->

comps_in_scan = = 1

)

References jpeg_component_info::DCT_scaled_size, DCTSIZE, jpeg_component_info::height_in_blocks, jpeg_component_info::last_col_width, jpeg_component_info::last_row_height, jpeg_component_info::MCU_blocks, jpeg_component_info::MCU_height, jpeg_component_info::MCU_sample_width, jpeg_component_info::MCU_width, tmp, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks.

jinit_input_controller

(

j_decompress_ptr

cinfo

)

References consume_markers(), jpeg_input_controller::eoi_reached, FALSE, finish_input_pass(), jpeg_input_controller::has_multiple_scans, my_input_controller::inheaders, JPOOL_PERMANENT, my_input_controller::pub, reset_input_controller(), SIZEOF, start_input_pass(), and TRUE.

Referenced by jpeg_CreateDecompress().

latch_quant_tables

(

j_decompress_ptr

cinfo

)

References ci, compptr, ERREXIT1, JPOOL_IMAGE, MEMCOPY(), NULL, NUM_QUANT_TBLS, jpeg_component_info::quant_table, jpeg_component_info::quant_tbl_no, and SIZEOF.

Referenced by start_input_pass().

METHODDEF

(

int

)

References BITS_IN_JSAMPLE, ci, jpeg_component_info::component_needed, compptr, jpeg_component_info::DCT_scaled_size, DCTSIZE, jpeg_component_info::downsampled_height, jpeg_component_info::downsampled_width, ERREXIT, ERREXIT1, ERREXIT2, FALSE, jpeg_component_info::h_samp_factor, jpeg_component_info::height_in_blocks, JERR_IMAGE_TOO_BIG, JPEG_MAX_DIMENSION, MAX, MAX_COMPONENTS, MAX_SAMP_FACTOR, NULL, jpeg_component_info::quant_table, TRUE, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks.

reset_input_controller

(

j_decompress_ptr

cinfo

)

References consume_markers(), jpeg_input_controller::eoi_reached, FALSE, jpeg_input_controller::has_multiple_scans, my_input_controller::inheaders, NULL, my_input_controller::pub, and TRUE.

Referenced by jinit_input_controller().

start_input_pass

(

j_decompress_ptr

cinfo

)

References latch_quant_tables().

cinfo blocks_in_MCU = 0

jpeg_component_info* compptr

Initial value:

{
  int ci, mcublks, tmp

else

Initial value:

{

    

      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
           MAX_COMPS_IN_SCAN)

cinfo MCU_rows_in_scan

Initial value:

= (JDIMENSION)
      jdiv_round_up((long) cinfo->image_height,
            (long) (cinfo->max_v_samp_factor*DCTSIZE))

cinfo MCUs_per_row

Initial value:

= (JDIMENSION)
      jdiv_round_up((long) cinfo->image_width,
            (long) (cinfo->max_h_samp_factor*DCTSIZE))