mirror of https://github.com/ZDoom/gzdoom.git
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
|
|
* jdpostct.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 decompression postprocessing controller.
|
|
* This controller manages the upsampling, color conversion, and color
|
|
* quantization/reduction steps; specifically, it controls the buffering
|
|
* between upsample/color conversion and color quantization/reduction.
|
|
*
|
|
* If no color quantization/reduction is required, then this module has no
|
|
* work to do, and it just hands off to the upsample/color conversion code.
|
|
* An integrated upsample/convert/quantize process would replace this module
|
|
* entirely.
|
|
*/
|
|
|
|
#define JPEG_INTERNALS
|
|
#include "jinclude.h"
|
|
#include "jpeglib.h"
|
|
|
|
|
|
/* Private buffer controller object */
|
|
|
|
typedef struct {
|
|
struct jpeg_d_post_controller pub; /* public fields */
|
|
} my_post_controller;
|
|
|
|
typedef my_post_controller * my_post_ptr;
|
|
|
|
|
|
/*
|
|
* Initialize for a processing pass.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
start_pass_dpost (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
|
|
{
|
|
my_post_ptr post = (my_post_ptr) cinfo->post;
|
|
|
|
switch (pass_mode) {
|
|
case JBUF_PASS_THRU:
|
|
/* For single-pass processing without color quantization,
|
|
* I have no work to do; just call the upsampler directly.
|
|
*/
|
|
post->pub.post_process_data = cinfo->upsample->upsample;
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize postprocessing controller.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jinit_d_post_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
|
|
{
|
|
my_post_ptr post;
|
|
|
|
post = (my_post_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
SIZEOF(my_post_controller));
|
|
cinfo->post = (struct jpeg_d_post_controller *) post;
|
|
post->pub.start_pass = start_pass_dpost;
|
|
}
|