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71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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/*
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* jdpostct.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains the decompression postprocessing controller.
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* This controller manages the upsampling, color conversion, and color
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* quantization/reduction steps; specifically, it controls the buffering
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* between upsample/color conversion and color quantization/reduction.
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*
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* If no color quantization/reduction is required, then this module has no
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* work to do, and it just hands off to the upsample/color conversion code.
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* An integrated upsample/convert/quantize process would replace this module
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* entirely.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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/* Private buffer controller object */
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typedef struct {
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struct jpeg_d_post_controller pub; /* public fields */
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} my_post_controller;
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typedef my_post_controller * my_post_ptr;
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/*
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* Initialize for a processing pass.
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*/
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METHODDEF(void)
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start_pass_dpost (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
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{
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my_post_ptr post = (my_post_ptr) cinfo->post;
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switch (pass_mode) {
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case JBUF_PASS_THRU:
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/* For single-pass processing without color quantization,
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* I have no work to do; just call the upsampler directly.
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*/
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post->pub.post_process_data = cinfo->upsample->upsample;
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break;
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default:
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ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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break;
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}
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}
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/*
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* Initialize postprocessing controller.
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*/
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GLOBAL(void)
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jinit_d_post_controller (j_decompress_ptr cinfo, boolean need_full_buffer)
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{
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my_post_ptr post;
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post = (my_post_ptr)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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SIZEOF(my_post_controller));
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cinfo->post = (struct jpeg_d_post_controller *) post;
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post->pub.start_pass = start_pass_dpost;
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}
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