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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
290 lines
9.5 KiB
C
290 lines
9.5 KiB
C
/*
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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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/* Color quantization source buffer: this holds output data from
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* the upsample/color conversion step to be passed to the quantizer.
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* For two-pass color quantization, we need a full-image buffer;
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* for one-pass operation, a strip buffer is sufficient.
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*/
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jvirt_sarray_ptr whole_image; /* virtual array, or NULL if one-pass */
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JSAMPARRAY buffer; /* strip buffer, or current strip of virtual */
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JDIMENSION strip_height; /* buffer size in rows */
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/* for two-pass mode only: */
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JDIMENSION starting_row; /* row # of first row in current strip */
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JDIMENSION next_row; /* index of next row to fill/empty in strip */
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} my_post_controller;
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typedef my_post_controller * my_post_ptr;
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/* Forward declarations */
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METHODDEF(void) post_process_1pass
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JPP((j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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#ifdef QUANT_2PASS_SUPPORTED
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METHODDEF(void) post_process_prepass
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JPP((j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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METHODDEF(void) post_process_2pass
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JPP((j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail));
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#endif
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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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if (cinfo->quantize_colors) {
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/* Single-pass processing with color quantization. */
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post->pub.post_process_data = post_process_1pass;
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/* We could be doing buffered-image output before starting a 2-pass
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* color quantization; in that case, jinit_d_post_controller did not
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* allocate a strip buffer. Use the virtual-array buffer as workspace.
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*/
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if (post->buffer == NULL) {
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post->buffer = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, post->whole_image,
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(JDIMENSION) 0, post->strip_height, TRUE);
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}
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} else {
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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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}
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break;
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#ifdef QUANT_2PASS_SUPPORTED
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case JBUF_SAVE_AND_PASS:
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/* First pass of 2-pass quantization */
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if (post->whole_image == NULL)
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ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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post->pub.post_process_data = post_process_prepass;
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break;
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case JBUF_CRANK_DEST:
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/* Second pass of 2-pass quantization */
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if (post->whole_image == NULL)
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ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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post->pub.post_process_data = post_process_2pass;
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break;
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#endif /* QUANT_2PASS_SUPPORTED */
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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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post->starting_row = post->next_row = 0;
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}
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/*
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* Process some data in the one-pass (strip buffer) case.
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* This is used for color precision reduction as well as one-pass quantization.
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*/
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METHODDEF(void)
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post_process_1pass (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail)
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{
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my_post_ptr post = (my_post_ptr) cinfo->post;
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JDIMENSION num_rows, max_rows;
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/* Fill the buffer, but not more than what we can dump out in one go. */
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/* Note we rely on the upsampler to detect bottom of image. */
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max_rows = out_rows_avail - *out_row_ctr;
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if (max_rows > post->strip_height)
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max_rows = post->strip_height;
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num_rows = 0;
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(*cinfo->upsample->upsample) (cinfo,
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input_buf, in_row_group_ctr, in_row_groups_avail,
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post->buffer, &num_rows, max_rows);
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/* Quantize and emit data. */
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(*cinfo->cquantize->color_quantize) (cinfo,
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post->buffer, output_buf + *out_row_ctr, (int) num_rows);
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*out_row_ctr += num_rows;
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}
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#ifdef QUANT_2PASS_SUPPORTED
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/*
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* Process some data in the first pass of 2-pass quantization.
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*/
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METHODDEF(void)
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post_process_prepass (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail)
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{
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my_post_ptr post = (my_post_ptr) cinfo->post;
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JDIMENSION old_next_row, num_rows;
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/* Reposition virtual buffer if at start of strip. */
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if (post->next_row == 0) {
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post->buffer = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, post->whole_image,
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post->starting_row, post->strip_height, TRUE);
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}
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/* Upsample some data (up to a strip height's worth). */
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old_next_row = post->next_row;
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(*cinfo->upsample->upsample) (cinfo,
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input_buf, in_row_group_ctr, in_row_groups_avail,
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post->buffer, &post->next_row, post->strip_height);
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/* Allow quantizer to scan new data. No data is emitted, */
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/* but we advance out_row_ctr so outer loop can tell when we're done. */
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if (post->next_row > old_next_row) {
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num_rows = post->next_row - old_next_row;
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(*cinfo->cquantize->color_quantize) (cinfo, post->buffer + old_next_row,
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(JSAMPARRAY) NULL, (int) num_rows);
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*out_row_ctr += num_rows;
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}
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/* Advance if we filled the strip. */
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if (post->next_row >= post->strip_height) {
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post->starting_row += post->strip_height;
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post->next_row = 0;
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}
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}
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/*
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* Process some data in the second pass of 2-pass quantization.
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*/
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METHODDEF(void)
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post_process_2pass (j_decompress_ptr cinfo,
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JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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JDIMENSION in_row_groups_avail,
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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JDIMENSION out_rows_avail)
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{
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my_post_ptr post = (my_post_ptr) cinfo->post;
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JDIMENSION num_rows, max_rows;
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/* Reposition virtual buffer if at start of strip. */
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if (post->next_row == 0) {
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post->buffer = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, post->whole_image,
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post->starting_row, post->strip_height, FALSE);
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}
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/* Determine number of rows to emit. */
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num_rows = post->strip_height - post->next_row; /* available in strip */
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max_rows = out_rows_avail - *out_row_ctr; /* available in output area */
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if (num_rows > max_rows)
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num_rows = max_rows;
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/* We have to check bottom of image here, can't depend on upsampler. */
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max_rows = cinfo->output_height - post->starting_row;
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if (num_rows > max_rows)
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num_rows = max_rows;
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/* Quantize and emit data. */
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(*cinfo->cquantize->color_quantize) (cinfo,
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post->buffer + post->next_row, output_buf + *out_row_ctr,
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(int) num_rows);
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*out_row_ctr += num_rows;
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/* Advance if we filled the strip. */
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post->next_row += num_rows;
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if (post->next_row >= post->strip_height) {
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post->starting_row += post->strip_height;
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post->next_row = 0;
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}
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}
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#endif /* QUANT_2PASS_SUPPORTED */
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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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post->whole_image = NULL; /* flag for no virtual arrays */
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post->buffer = NULL; /* flag for no strip buffer */
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/* Create the quantization buffer, if needed */
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if (cinfo->quantize_colors) {
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/* The buffer strip height is max_v_samp_factor, which is typically
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* an efficient number of rows for upsampling to return.
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* (In the presence of output rescaling, we might want to be smarter?)
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*/
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post->strip_height = (JDIMENSION) cinfo->max_v_samp_factor;
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if (need_full_buffer) {
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/* Two-pass color quantization: need full-image storage. */
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/* We round up the number of rows to a multiple of the strip height. */
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#ifdef QUANT_2PASS_SUPPORTED
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post->whole_image = (*cinfo->mem->request_virt_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
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cinfo->output_width * cinfo->out_color_components,
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(JDIMENSION) jround_up((long) cinfo->output_height,
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(long) post->strip_height),
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post->strip_height);
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#else
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ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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#endif /* QUANT_2PASS_SUPPORTED */
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} else {
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/* One-pass color quantization: just make a strip buffer. */
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post->buffer = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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cinfo->output_width * cinfo->out_color_components,
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post->strip_height);
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}
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}
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}
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