560 lines
19 KiB
C++
560 lines
19 KiB
C++
// * jcmaster.c
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// *
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// * Copyright (C) 1991-1995, 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 master control logic for the JPEG compressor.
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// * These routines are concerned with parameter validation, initial setup,
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// * and inter-pass control (determining the number of passes and the work
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// * to be done in each pass).
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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 state
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typedef enum {
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main_pass, // input data, also do first output step
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huff_opt_pass, // Huffman code optimization pass
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output_pass // data output pass
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} c_pass_type;
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typedef struct {
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struct jpeg_comp_master pub; // public fields
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c_pass_type pass_type; // the type of the current pass
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int pass_number; // # of passes completed
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int total_passes; // total # of passes needed
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int scan_number; // current index in scan_info[]
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} my_comp_master;
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typedef my_comp_master * my_master_ptr;
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// * Support routines that do various essential calculations.
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LOCAL void
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initial_setup (j_compress_ptr cinfo)
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// Do computations that are needed before master selection phase
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{
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int ci;
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jpeg_component_info *compptr;
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LONG samplesperrow;
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JDIMENSION jd_samplesperrow;
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// Sanity check on image dimensions
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if (cinfo->image_height <= 0 || cinfo->image_width <= 0
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|| cinfo->num_components <= 0 || cinfo->input_components <= 0)
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ERREXIT(cinfo, JERR_EMPTY_IMAGE);
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// Make sure image isn't bigger than I can handle
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if ((LONG) cinfo->image_height > (LONG) JPEG_MAX_DIMENSION ||
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(LONG) cinfo->image_width > (LONG) JPEG_MAX_DIMENSION)
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ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
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// Width of an input scanline must be representable as JDIMENSION.
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samplesperrow = (LONG) cinfo->image_width * (LONG) cinfo->input_components;
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jd_samplesperrow = (JDIMENSION) samplesperrow;
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if ((LONG) jd_samplesperrow != samplesperrow)
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ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
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// For now, precision must match compiled-in value...
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if (cinfo->data_precision != BITS_IN_JSAMPLE)
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ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
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// Check that number of components won't exceed internal array sizes
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if (cinfo->num_components > MAX_COMPONENTS)
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ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
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MAX_COMPONENTS);
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// Compute maximum sampling factors; check factor validity
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cinfo->max_h_samp_factor = 1;
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cinfo->max_v_samp_factor = 1;
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
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compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
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ERREXIT(cinfo, JERR_BAD_SAMPLING);
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cinfo->max_h_samp_factor = BAS_Max(cinfo->max_h_samp_factor,
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compptr->h_samp_factor);
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cinfo->max_v_samp_factor = BAS_Max(cinfo->max_v_samp_factor,
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compptr->v_samp_factor);
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}
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// Compute dimensions of components
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++) {
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// Fill in the correct component_index value; don't rely on application
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compptr->component_index = ci;
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// For compression, we never do DCT scaling.
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compptr->DCT_scaled_size = DCTSIZE;
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// Size in DCT blocks
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compptr->width_in_blocks = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_width * (LONG) compptr->h_samp_factor,
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(LONG) (cinfo->max_h_samp_factor * DCTSIZE));
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compptr->height_in_blocks = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_height * (LONG) compptr->v_samp_factor,
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(LONG) (cinfo->max_v_samp_factor * DCTSIZE));
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// Size in samples
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compptr->downsampled_width = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_width * (LONG) compptr->h_samp_factor,
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(LONG) cinfo->max_h_samp_factor);
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compptr->downsampled_height = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_height * (LONG) compptr->v_samp_factor,
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(LONG) cinfo->max_v_samp_factor);
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// Mark component needed (this flag isn't actually used for compression)
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compptr->component_needed = TRUE;
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}
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// Compute number of fully interleaved MCU rows (number of times that
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// * main controller will call coefficient controller).
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cinfo->total_iMCU_rows = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_height,
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(LONG) (cinfo->max_v_samp_factor*DCTSIZE));
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}
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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LOCAL void
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validate_script (j_compress_ptr cinfo)
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// Verify that the scan script in cinfo->scan_info[] is valid; also
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// * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
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{
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const jpeg_scan_info * scanptr;
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int scanno, ncomps, ci, coefi, thisi;
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int Ss, Se, Ah, Al;
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boolean component_sent[MAX_COMPONENTS];
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#ifdef C_PROGRESSIVE_SUPPORTED
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int * last_bitpos_ptr;
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int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
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// -1 until that coefficient has been seen; then last Al for it
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#endif
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if (cinfo->num_scans <= 0)
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ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
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// For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
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// * for progressive JPEG, no scan can have this.
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scanptr = cinfo->scan_info;
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if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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cinfo->progressive_mode = TRUE;
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last_bitpos_ptr = & last_bitpos[0][0];
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for (ci = 0; ci < cinfo->num_components; ci++)
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for (coefi = 0; coefi < DCTSIZE2; coefi++)
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*last_bitpos_ptr++ = -1;
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#else
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ERREXIT(cinfo, JERR_NOT_COMPILED);
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#endif
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} else {
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cinfo->progressive_mode = FALSE;
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for (ci = 0; ci < cinfo->num_components; ci++)
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component_sent[ci] = FALSE;
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}
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for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
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// Validate component indexes
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ncomps = scanptr->comps_in_scan;
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if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
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ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
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for (ci = 0; ci < ncomps; ci++) {
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thisi = scanptr->component_index[ci];
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if (thisi < 0 || thisi >= cinfo->num_components)
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ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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// Components must appear in SOF order within each scan
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if (ci > 0 && thisi <= scanptr->component_index[ci-1])
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ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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}
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// Validate progression parameters
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Ss = scanptr->Ss;
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Se = scanptr->Se;
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Ah = scanptr->Ah;
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Al = scanptr->Al;
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if (cinfo->progressive_mode) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
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Ah < 0 || Ah > 13 || Al < 0 || Al > 13)
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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if (Ss == 0) {
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if (Se != 0) // DC and AC together not OK
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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} else {
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if (ncomps != 1) // AC scans must be for only one component
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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}
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for (ci = 0; ci < ncomps; ci++) {
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last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
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if (Ss != 0 && last_bitpos_ptr[0] < 0) // AC without prior DC scan
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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for (coefi = Ss; coefi <= Se; coefi++) {
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if (last_bitpos_ptr[coefi] < 0) {
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// first scan of this coefficient
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if (Ah != 0)
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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} else {
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// not first scan
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if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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}
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last_bitpos_ptr[coefi] = Al;
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}
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}
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#endif
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} else {
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// For sequential JPEG, all progression parameters must be these:
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if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
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ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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// Make sure components are not sent twice
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for (ci = 0; ci < ncomps; ci++) {
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thisi = scanptr->component_index[ci];
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if (component_sent[thisi])
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ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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component_sent[thisi] = TRUE;
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}
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}
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}
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// Now verify that everything got sent.
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if (cinfo->progressive_mode) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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// For progressive mode, we only check that at least some DC data
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// * got sent for each component; the spec does not require that all bits
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// * of all coefficients be transmitted. Would it be wiser to enforce
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// * transmission of all coefficient bits??
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for (ci = 0; ci < cinfo->num_components; ci++) {
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if (last_bitpos[ci][0] < 0)
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ERREXIT(cinfo, JERR_MISSING_DATA);
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}
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#endif
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} else {
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for (ci = 0; ci < cinfo->num_components; ci++) {
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if (! component_sent[ci])
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ERREXIT(cinfo, JERR_MISSING_DATA);
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}
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}
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}
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#endif // C_MULTISCAN_FILES_SUPPORTED
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LOCAL void
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select_scan_parameters (j_compress_ptr cinfo)
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// Set up the scan parameters for the current scan
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{
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int ci;
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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if (cinfo->scan_info != NULL) {
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// Prepare for current scan --- the script is already validated
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my_master_ptr master = (my_master_ptr) cinfo->master;
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const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
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cinfo->comps_in_scan = scanptr->comps_in_scan;
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for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
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cinfo->cur_comp_info[ci] =
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&cinfo->comp_info[scanptr->component_index[ci]];
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}
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cinfo->Ss = scanptr->Ss;
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cinfo->Se = scanptr->Se;
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cinfo->Ah = scanptr->Ah;
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cinfo->Al = scanptr->Al;
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}
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else
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#endif
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{
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// Prepare for single sequential-JPEG scan containing all components
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if (cinfo->num_components > MAX_COMPS_IN_SCAN)
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ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
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MAX_COMPS_IN_SCAN);
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cinfo->comps_in_scan = cinfo->num_components;
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for (ci = 0; ci < cinfo->num_components; ci++) {
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cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
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}
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cinfo->Ss = 0;
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cinfo->Se = DCTSIZE2-1;
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cinfo->Ah = 0;
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cinfo->Al = 0;
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}
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}
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LOCAL void
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per_scan_setup (j_compress_ptr cinfo)
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// Do computations that are needed before processing a JPEG scan
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// cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set
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{
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int ci, mcublks, tmp;
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jpeg_component_info *compptr;
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if (cinfo->comps_in_scan == 1) {
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// Noninterleaved (single-component) scan
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compptr = cinfo->cur_comp_info[0];
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// Overall image size in MCUs
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cinfo->MCUs_per_row = compptr->width_in_blocks;
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cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
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// For noninterleaved scan, always one block per MCU
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compptr->MCU_width = 1;
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compptr->MCU_height = 1;
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compptr->MCU_blocks = 1;
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compptr->MCU_sample_width = DCTSIZE;
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compptr->last_col_width = 1;
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// For noninterleaved scans, it is convenient to define last_row_height
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// * as the number of block rows present in the last iMCU row.
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tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
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if (tmp == 0) tmp = compptr->v_samp_factor;
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compptr->last_row_height = tmp;
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// Prepare array describing MCU composition
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cinfo->blocks_in_MCU = 1;
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cinfo->MCU_membership[0] = 0;
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} else {
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// Interleaved (multi-component) scan
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if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
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ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
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MAX_COMPS_IN_SCAN);
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// Overall image size in MCUs
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cinfo->MCUs_per_row = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_width,
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(LONG) (cinfo->max_h_samp_factor*DCTSIZE));
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cinfo->MCU_rows_in_scan = (JDIMENSION)
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jdiv_round_up((LONG) cinfo->image_height,
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(LONG) (cinfo->max_v_samp_factor*DCTSIZE));
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cinfo->blocks_in_MCU = 0;
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for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
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compptr = cinfo->cur_comp_info[ci];
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// Sampling factors give # of blocks of component in each MCU
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compptr->MCU_width = compptr->h_samp_factor;
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compptr->MCU_height = compptr->v_samp_factor;
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compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
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compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
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// Figure number of non-dummy blocks in last MCU column & row
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tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
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if (tmp == 0) tmp = compptr->MCU_width;
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compptr->last_col_width = tmp;
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tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
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if (tmp == 0) tmp = compptr->MCU_height;
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compptr->last_row_height = tmp;
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// Prepare array describing MCU composition
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mcublks = compptr->MCU_blocks;
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if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
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ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
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while (mcublks-- > 0) {
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cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
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}
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}
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}
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// Convert restart specified in rows to actual MCU count.
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// Note that count must fit in 16 bits, so we provide limiting.
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if (cinfo->restart_in_rows > 0) {
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LONG nominal = (LONG) cinfo->restart_in_rows * (LONG) cinfo->MCUs_per_row;
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cinfo->restart_interval = (unsigned int) BAS_Min<LONG>(nominal, 65535L);
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}
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}
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// * Per-pass setup.
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// * This is called at the beginning of each pass. We determine which modules
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// * will be active during this pass and give them appropriate start_pass calls.
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// * We also set is_last_pass to indicate whether any more passes will be
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// * required.
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METHODDEF void
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prepare_for_pass (j_compress_ptr cinfo)
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{
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my_master_ptr master = (my_master_ptr) cinfo->master;
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switch (master->pass_type) {
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case main_pass:
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// Initial pass: will collect input data, and do either Huffman
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// * optimization or data output for the first scan.
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select_scan_parameters(cinfo);
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per_scan_setup(cinfo);
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if (! cinfo->raw_data_in) {
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(*cinfo->cconvert->start_pass) (cinfo);
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(*cinfo->downsample->start_pass) (cinfo);
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(*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
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}
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(*cinfo->fdct->start_pass) (cinfo);
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(*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
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(*cinfo->coef->start_pass) (cinfo,
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(master->total_passes > 1 ?
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JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
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(*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
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if (cinfo->optimize_coding) {
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// No immediate data output; postpone writing frame/scan headers
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master->pub.call_pass_startup = FALSE;
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} else {
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// Will write frame/scan headers at first jpeg_write_scanlines call
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master->pub.call_pass_startup = TRUE;
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}
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break;
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#ifdef ENTROPY_OPT_SUPPORTED
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case huff_opt_pass:
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// Do Huffman optimization for a scan after the first one.
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select_scan_parameters(cinfo);
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per_scan_setup(cinfo);
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if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
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(*cinfo->entropy->start_pass) (cinfo, TRUE);
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(*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
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master->pub.call_pass_startup = FALSE;
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break;
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}
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// Special case: Huffman DC refinement scans need no Huffman table
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// * and therefore we can skip the optimization pass for them.
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master->pass_type = output_pass;
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master->pass_number++;
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//FALLTHROUGH
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#endif
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case output_pass:
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// Do a data-output pass.
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// We need not repeat per-scan setup if prior optimization pass did it.
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if (! cinfo->optimize_coding) {
|
|
select_scan_parameters(cinfo);
|
|
per_scan_setup(cinfo);
|
|
}
|
|
(*cinfo->entropy->start_pass) (cinfo, FALSE);
|
|
(*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
|
|
// We emit frame/scan headers now
|
|
if (master->scan_number == 0)
|
|
(*cinfo->marker->write_frame_header) (cinfo);
|
|
(*cinfo->marker->write_scan_header) (cinfo);
|
|
master->pub.call_pass_startup = FALSE;
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
|
}
|
|
|
|
master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
|
|
|
|
// Set up progress monitor's pass info if present
|
|
if (cinfo->progress != NULL) {
|
|
cinfo->progress->completed_passes = master->pass_number;
|
|
cinfo->progress->total_passes = master->total_passes;
|
|
}
|
|
}
|
|
|
|
|
|
// * Special start-of-pass hook.
|
|
// * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
|
|
// * In single-pass processing, we need this hook because we don't want to
|
|
// * write frame/scan headers during jpeg_start_compress; we want to let the
|
|
// * application write COM markers etc. between jpeg_start_compress and the
|
|
// * jpeg_write_scanlines loop.
|
|
// * In multi-pass processing, this routine is not used.
|
|
|
|
METHODDEF void
|
|
pass_startup (j_compress_ptr cinfo)
|
|
{
|
|
cinfo->master->call_pass_startup = FALSE; // reset flag so call only once
|
|
|
|
(*cinfo->marker->write_frame_header) (cinfo);
|
|
(*cinfo->marker->write_scan_header) (cinfo);
|
|
}
|
|
|
|
|
|
// * Finish up at end of pass.
|
|
|
|
METHODDEF void
|
|
finish_pass_master (j_compress_ptr cinfo)
|
|
{
|
|
my_master_ptr master = (my_master_ptr) cinfo->master;
|
|
|
|
// The entropy coder always needs an end-of-pass call,
|
|
// * either to analyze statistics or to flush its output buffer.
|
|
(*cinfo->entropy->finish_pass) (cinfo);
|
|
|
|
// Update state for next pass
|
|
switch (master->pass_type) {
|
|
case main_pass:
|
|
// next pass is either output of scan 0 (after optimization)
|
|
// * or output of scan 1 (if no optimization).
|
|
master->pass_type = output_pass;
|
|
if (! cinfo->optimize_coding)
|
|
master->scan_number++;
|
|
break;
|
|
case huff_opt_pass:
|
|
// next pass is always output of current scan
|
|
master->pass_type = output_pass;
|
|
break;
|
|
case output_pass:
|
|
// next pass is either optimization or output of next scan
|
|
if (cinfo->optimize_coding)
|
|
master->pass_type = huff_opt_pass;
|
|
master->scan_number++;
|
|
break;
|
|
}
|
|
|
|
master->pass_number++;
|
|
}
|
|
|
|
|
|
// * Initialize master compression control.
|
|
|
|
GLOBAL void
|
|
jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
|
|
{
|
|
my_master_ptr master;
|
|
|
|
master = (my_master_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
SIZEOF(my_comp_master));
|
|
cinfo->master = (struct jpeg_comp_master *) master;
|
|
master->pub.prepare_for_pass = prepare_for_pass;
|
|
master->pub.pass_startup = pass_startup;
|
|
master->pub.finish_pass = finish_pass_master;
|
|
master->pub.is_last_pass = FALSE;
|
|
|
|
// Validate parameters, determine derived values
|
|
initial_setup(cinfo);
|
|
|
|
if (cinfo->scan_info != NULL) {
|
|
#ifdef C_MULTISCAN_FILES_SUPPORTED
|
|
validate_script(cinfo);
|
|
#else
|
|
ERREXIT(cinfo, JERR_NOT_COMPILED);
|
|
#endif
|
|
} else {
|
|
cinfo->progressive_mode = FALSE;
|
|
cinfo->num_scans = 1;
|
|
}
|
|
|
|
if (cinfo->progressive_mode) // TEMPORARY HACK ???
|
|
cinfo->optimize_coding = TRUE; // assume default tables no good for progressive mode
|
|
|
|
// Initialize my private state
|
|
if (transcode_only) {
|
|
// no main pass in transcoding
|
|
if (cinfo->optimize_coding)
|
|
master->pass_type = huff_opt_pass;
|
|
else
|
|
master->pass_type = output_pass;
|
|
} else {
|
|
// for normal compression, first pass is always this type:
|
|
master->pass_type = main_pass;
|
|
}
|
|
master->scan_number = 0;
|
|
master->pass_number = 0;
|
|
if (cinfo->optimize_coding)
|
|
master->total_passes = cinfo->num_scans * 2;
|
|
else
|
|
master->total_passes = cinfo->num_scans;
|
|
}
|