mirror of https://github.com/axmolengine/axmol.git
163 lines
5.1 KiB
C
163 lines
5.1 KiB
C
|
/*
|
||
|
* jcmainct.c
|
||
|
*
|
||
|
* This file was part of the Independent JPEG Group's software:
|
||
|
* Copyright (C) 1994-1996, Thomas G. Lane.
|
||
|
* It was modified by The libjpeg-turbo Project to include only code relevant
|
||
|
* to libjpeg-turbo.
|
||
|
* For conditions of distribution and use, see the accompanying README.ijg
|
||
|
* 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"
|
||
|
|
||
|
|
||
|
/* 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];
|
||
|
} my_main_controller;
|
||
|
|
||
|
typedef my_main_controller *my_main_ptr;
|
||
|
|
||
|
|
||
|
/* Forward declarations */
|
||
|
METHODDEF(void) process_data_simple_main(j_compress_ptr cinfo,
|
||
|
JSAMPARRAY input_buf,
|
||
|
JDIMENSION *in_row_ctr,
|
||
|
JDIMENSION in_rows_avail);
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Initialize for a processing pass.
|
||
|
*/
|
||
|
|
||
|
METHODDEF(void)
|
||
|
start_pass_main(j_compress_ptr cinfo, J_BUF_MODE pass_mode)
|
||
|
{
|
||
|
my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
|
||
|
|
||
|
/* Do nothing in raw-data mode. */
|
||
|
if (cinfo->raw_data_in)
|
||
|
return;
|
||
|
|
||
|
if (pass_mode != JBUF_PASS_THRU)
|
||
|
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||
|
|
||
|
main_ptr->cur_iMCU_row = 0; /* initialize counters */
|
||
|
main_ptr->rowgroup_ctr = 0;
|
||
|
main_ptr->suspended = FALSE;
|
||
|
main_ptr->pass_mode = pass_mode; /* save mode for use by process_data */
|
||
|
main_ptr->pub.process_data = process_data_simple_main;
|
||
|
}
|
||
|
|
||
|
|
||
|
/*
|
||
|
* 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_ptr = (my_main_ptr)cinfo->main;
|
||
|
|
||
|
while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
|
||
|
/* Read input data if we haven't filled the main buffer yet */
|
||
|
if (main_ptr->rowgroup_ctr < DCTSIZE)
|
||
|
(*cinfo->prep->pre_process_data) (cinfo, input_buf, in_row_ctr,
|
||
|
in_rows_avail, main_ptr->buffer,
|
||
|
&main_ptr->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_ptr->rowgroup_ctr != DCTSIZE)
|
||
|
return;
|
||
|
|
||
|
/* Send the completed row to the compressor */
|
||
|
if (!(*cinfo->coef->compress_data) (cinfo, main_ptr->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_ptr->suspended) {
|
||
|
(*in_row_ctr)--;
|
||
|
main_ptr->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_ptr->suspended) {
|
||
|
(*in_row_ctr)++;
|
||
|
main_ptr->suspended = FALSE;
|
||
|
}
|
||
|
main_ptr->rowgroup_ctr = 0;
|
||
|
main_ptr->cur_iMCU_row++;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
/*
|
||
|
* Initialize main buffer controller.
|
||
|
*/
|
||
|
|
||
|
GLOBAL(void)
|
||
|
jinit_c_main_controller(j_compress_ptr cinfo, boolean need_full_buffer)
|
||
|
{
|
||
|
my_main_ptr main_ptr;
|
||
|
int ci;
|
||
|
jpeg_component_info *compptr;
|
||
|
|
||
|
main_ptr = (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_ptr;
|
||
|
main_ptr->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) {
|
||
|
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
||
|
} else {
|
||
|
/* Allocate a strip buffer for each component */
|
||
|
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
|
||
|
ci++, compptr++) {
|
||
|
main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
|
||
|
((j_common_ptr)cinfo, JPOOL_IMAGE,
|
||
|
compptr->width_in_blocks * DCTSIZE,
|
||
|
(JDIMENSION)(compptr->v_samp_factor * DCTSIZE));
|
||
|
}
|
||
|
}
|
||
|
}
|