#if !defined(_FX_JPEG_TURBO_) | |
/* | |
* jcmainct.c | |
* | |
* Copyright (C) 1994-1996, Thomas G. Lane. | |
* This file is part of the Independent JPEG Group's software. | |
* For conditions of distribution and use, see the accompanying README file. | |
* | |
* This file contains the main buffer controller for compression. | |
* The main buffer lies between the pre-processor and the JPEG | |
* compressor proper; it holds downsampled data in the JPEG colorspace. | |
*/ | |
#define JPEG_INTERNALS | |
#include "jinclude.h" | |
#include "jpeglib.h" | |
/* Note: currently, there is no operating mode in which a full-image buffer | |
* is needed at this step. If there were, that mode could not be used with | |
* "raw data" input, since this module is bypassed in that case. However, | |
* we've left the code here for possible use in special applications. | |
*/ | |
#undef FULL_MAIN_BUFFER_SUPPORTED | |
/* Private buffer controller object */ | |
typedef struct { | |
struct jpeg_c_main_controller pub; /* public fields */ | |
JDIMENSION cur_iMCU_row; /* number of current iMCU row */ | |
JDIMENSION rowgroup_ctr; /* counts row groups received in iMCU row */ | |
boolean suspended; /* remember if we suspended output */ | |
J_BUF_MODE pass_mode; /* current operating mode */ | |
/* If using just a strip buffer, this points to the entire set of buffers | |
* (we allocate one for each component). In the full-image case, this | |
* points to the currently accessible strips of the virtual arrays. | |
*/ | |
JSAMPARRAY buffer[MAX_COMPONENTS]; | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
/* If using full-image storage, this array holds pointers to virtual-array | |
* control blocks for each component. Unused if not full-image storage. | |
*/ | |
jvirt_sarray_ptr whole_image[MAX_COMPONENTS]; | |
#endif | |
} my_main_controller; | |
typedef my_main_controller * my_main_ptr; | |
/* Forward declarations */ | |
METHODDEF(void) process_data_simple_main | |
JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf, | |
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail)); | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
METHODDEF(void) process_data_buffer_main | |
JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf, | |
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail)); | |
#endif | |
/* | |
* Initialize for a processing pass. | |
*/ | |
METHODDEF(void) | |
start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode) | |
{ | |
my_main_ptr main = (my_main_ptr) cinfo->main; | |
/* Do nothing in raw-data mode. */ | |
if (cinfo->raw_data_in) | |
return; | |
main->cur_iMCU_row = 0; /* initialize counters */ | |
main->rowgroup_ctr = 0; | |
main->suspended = FALSE; | |
main->pass_mode = pass_mode; /* save mode for use by process_data */ | |
switch (pass_mode) { | |
case JBUF_PASS_THRU: | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
if (main->whole_image[0] != NULL) | |
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | |
#endif | |
main->pub.process_data = process_data_simple_main; | |
break; | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
case JBUF_SAVE_SOURCE: | |
case JBUF_CRANK_DEST: | |
case JBUF_SAVE_AND_PASS: | |
if (main->whole_image[0] == NULL) | |
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | |
main->pub.process_data = process_data_buffer_main; | |
break; | |
#endif | |
default: | |
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | |
break; | |
} | |
} | |
/* | |
* Process some data. | |
* This routine handles the simple pass-through mode, | |
* where we have only a strip buffer. | |
*/ | |
METHODDEF(void) | |
process_data_simple_main (j_compress_ptr cinfo, | |
JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, | |
JDIMENSION in_rows_avail) | |
{ | |
my_main_ptr main = (my_main_ptr) cinfo->main; | |
while (main->cur_iMCU_row < cinfo->total_iMCU_rows) { | |
/* Read input data if we haven't filled the main buffer yet */ | |
if (main->rowgroup_ctr < DCTSIZE) | |
(*cinfo->prep->pre_process_data) (cinfo, | |
input_buf, in_row_ctr, in_rows_avail, | |
main->buffer, &main->rowgroup_ctr, | |
(JDIMENSION) DCTSIZE); | |
/* If we don't have a full iMCU row buffered, return to application for | |
* more data. Note that preprocessor will always pad to fill the iMCU row | |
* at the bottom of the image. | |
*/ | |
if (main->rowgroup_ctr != DCTSIZE) | |
return; | |
/* Send the completed row to the compressor */ | |
if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) { | |
/* If compressor did not consume the whole row, then we must need to | |
* suspend processing and return to the application. In this situation | |
* we pretend we didn't yet consume the last input row; otherwise, if | |
* it happened to be the last row of the image, the application would | |
* think we were done. | |
*/ | |
if (! main->suspended) { | |
(*in_row_ctr)--; | |
main->suspended = TRUE; | |
} | |
return; | |
} | |
/* We did finish the row. Undo our little suspension hack if a previous | |
* call suspended; then mark the main buffer empty. | |
*/ | |
if (main->suspended) { | |
(*in_row_ctr)++; | |
main->suspended = FALSE; | |
} | |
main->rowgroup_ctr = 0; | |
main->cur_iMCU_row++; | |
} | |
} | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
/* | |
* Process some data. | |
* This routine handles all of the modes that use a full-size buffer. | |
*/ | |
METHODDEF(void) | |
process_data_buffer_main (j_compress_ptr cinfo, | |
JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, | |
JDIMENSION in_rows_avail) | |
{ | |
my_main_ptr main = (my_main_ptr) cinfo->main; | |
int ci; | |
jpeg_component_info *compptr; | |
boolean writing = (main->pass_mode != JBUF_CRANK_DEST); | |
while (main->cur_iMCU_row < cinfo->total_iMCU_rows) { | |
/* Realign the virtual buffers if at the start of an iMCU row. */ | |
if (main->rowgroup_ctr == 0) { | |
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
ci++, compptr++) { | |
main->buffer[ci] = (*cinfo->mem->access_virt_sarray) | |
((j_common_ptr) cinfo, main->whole_image[ci], | |
main->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE), | |
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing); | |
} | |
/* In a read pass, pretend we just read some source data. */ | |
if (! writing) { | |
*in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE; | |
main->rowgroup_ctr = DCTSIZE; | |
} | |
} | |
/* If a write pass, read input data until the current iMCU row is full. */ | |
/* Note: preprocessor will pad if necessary to fill the last iMCU row. */ | |
if (writing) { | |
(*cinfo->prep->pre_process_data) (cinfo, | |
input_buf, in_row_ctr, in_rows_avail, | |
main->buffer, &main->rowgroup_ctr, | |
(JDIMENSION) DCTSIZE); | |
/* Return to application if we need more data to fill the iMCU row. */ | |
if (main->rowgroup_ctr < DCTSIZE) | |
return; | |
} | |
/* Emit data, unless this is a sink-only pass. */ | |
if (main->pass_mode != JBUF_SAVE_SOURCE) { | |
if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) { | |
/* If compressor did not consume the whole row, then we must need to | |
* suspend processing and return to the application. In this situation | |
* we pretend we didn't yet consume the last input row; otherwise, if | |
* it happened to be the last row of the image, the application would | |
* think we were done. | |
*/ | |
if (! main->suspended) { | |
(*in_row_ctr)--; | |
main->suspended = TRUE; | |
} | |
return; | |
} | |
/* We did finish the row. Undo our little suspension hack if a previous | |
* call suspended; then mark the main buffer empty. | |
*/ | |
if (main->suspended) { | |
(*in_row_ctr)++; | |
main->suspended = FALSE; | |
} | |
} | |
/* If get here, we are done with this iMCU row. Mark buffer empty. */ | |
main->rowgroup_ctr = 0; | |
main->cur_iMCU_row++; | |
} | |
} | |
#endif /* FULL_MAIN_BUFFER_SUPPORTED */ | |
/* | |
* Initialize main buffer controller. | |
*/ | |
GLOBAL(void) | |
jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer) | |
{ | |
my_main_ptr main; | |
int ci; | |
jpeg_component_info *compptr; | |
main = (my_main_ptr) | |
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
SIZEOF(my_main_controller)); | |
cinfo->main = (struct jpeg_c_main_controller *) main; | |
main->pub.start_pass = start_pass_main; | |
/* We don't need to create a buffer in raw-data mode. */ | |
if (cinfo->raw_data_in) | |
return; | |
/* Create the buffer. It holds downsampled data, so each component | |
* may be of a different size. | |
*/ | |
if (need_full_buffer) { | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
/* Allocate a full-image virtual array for each component */ | |
/* Note we pad the bottom to a multiple of the iMCU height */ | |
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
ci++, compptr++) { | |
main->whole_image[ci] = (*cinfo->mem->request_virt_sarray) | |
((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, | |
compptr->width_in_blocks * DCTSIZE, | |
(JDIMENSION) jround_up((long) compptr->height_in_blocks, | |
(long) compptr->v_samp_factor) * DCTSIZE, | |
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE)); | |
} | |
#else | |
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); | |
#endif | |
} else { | |
#ifdef FULL_MAIN_BUFFER_SUPPORTED | |
main->whole_image[0] = NULL; /* flag for no virtual arrays */ | |
#endif | |
/* Allocate a strip buffer for each component */ | |
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
ci++, compptr++) { | |
main->buffer[ci] = (*cinfo->mem->alloc_sarray) | |
((j_common_ptr) cinfo, JPOOL_IMAGE, | |
compptr->width_in_blocks * DCTSIZE, | |
(JDIMENSION) (compptr->v_samp_factor * DCTSIZE)); | |
} | |
} | |
} | |
#endif //_FX_JPEG_TURBO_ |