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390 lines
11 KiB
C
390 lines
11 KiB
C
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/*
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* rdrle.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* It was modified by The libjpeg-turbo Project to include only code and
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* information relevant to libjpeg-turbo.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains routines to read input images in Utah RLE format.
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* The Utah Raster Toolkit library is required (version 3.1 or later).
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*
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* These routines may need modification for non-Unix environments or
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* specialized applications. As they stand, they assume input from
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* an ordinary stdio stream. They further assume that reading begins
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* at the start of the file; start_input may need work if the
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* user interface has already read some data (e.g., to determine that
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* the file is indeed RLE format).
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*
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* Based on code contributed by Mike Lijewski,
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* with updates from Robert Hutchinson.
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#ifdef RLE_SUPPORTED
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/* rle.h is provided by the Utah Raster Toolkit. */
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#include <rle.h>
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/*
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* We assume that JSAMPLE has the same representation as rle_pixel,
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* to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples.
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*/
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#if BITS_IN_JSAMPLE != 8
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Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
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#endif
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/*
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* We support the following types of RLE files:
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*
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* GRAYSCALE - 8 bits, no colormap
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* MAPPEDGRAY - 8 bits, 1 channel colomap
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* PSEUDOCOLOR - 8 bits, 3 channel colormap
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* TRUECOLOR - 24 bits, 3 channel colormap
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* DIRECTCOLOR - 24 bits, no colormap
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*
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* For now, we ignore any alpha channel in the image.
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*/
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typedef enum
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{ GRAYSCALE, MAPPEDGRAY, PSEUDOCOLOR, TRUECOLOR, DIRECTCOLOR } rle_kind;
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/*
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* Since RLE stores scanlines bottom-to-top, we have to invert the image
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* to conform to JPEG's top-to-bottom order. To do this, we read the
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* incoming image into a virtual array on the first get_pixel_rows call,
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* then fetch the required row from the virtual array on subsequent calls.
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*/
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typedef struct _rle_source_struct *rle_source_ptr;
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typedef struct _rle_source_struct {
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struct cjpeg_source_struct pub; /* public fields */
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rle_kind visual; /* actual type of input file */
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jvirt_sarray_ptr image; /* virtual array to hold the image */
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JDIMENSION row; /* current row # in the virtual array */
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rle_hdr header; /* Input file information */
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rle_pixel **rle_row; /* holds a row returned by rle_getrow() */
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} rle_source_struct;
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/*
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* Read the file header; return image size and component count.
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*/
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METHODDEF(void)
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start_input_rle(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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rle_source_ptr source = (rle_source_ptr)sinfo;
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JDIMENSION width, height;
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#ifdef PROGRESS_REPORT
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cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;
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#endif
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/* Use RLE library routine to get the header info */
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source->header = *rle_hdr_init(NULL);
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source->header.rle_file = source->pub.input_file;
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switch (rle_get_setup(&(source->header))) {
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case RLE_SUCCESS:
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/* A-OK */
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break;
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case RLE_NOT_RLE:
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ERREXIT(cinfo, JERR_RLE_NOT);
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break;
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case RLE_NO_SPACE:
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ERREXIT(cinfo, JERR_RLE_MEM);
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break;
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case RLE_EMPTY:
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ERREXIT(cinfo, JERR_RLE_EMPTY);
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break;
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case RLE_EOF:
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ERREXIT(cinfo, JERR_RLE_EOF);
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break;
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default:
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ERREXIT(cinfo, JERR_RLE_BADERROR);
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break;
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}
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/* Figure out what we have, set private vars and return values accordingly */
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width = source->header.xmax - source->header.xmin + 1;
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height = source->header.ymax - source->header.ymin + 1;
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source->header.xmin = 0; /* realign horizontally */
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source->header.xmax = width - 1;
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cinfo->image_width = width;
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cinfo->image_height = height;
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cinfo->data_precision = 8; /* we can only handle 8 bit data */
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if (source->header.ncolors == 1 && source->header.ncmap == 0) {
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source->visual = GRAYSCALE;
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TRACEMS2(cinfo, 1, JTRC_RLE_GRAY, width, height);
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} else if (source->header.ncolors == 1 && source->header.ncmap == 1) {
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source->visual = MAPPEDGRAY;
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TRACEMS3(cinfo, 1, JTRC_RLE_MAPGRAY, width, height,
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1 << source->header.cmaplen);
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} else if (source->header.ncolors == 1 && source->header.ncmap == 3) {
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source->visual = PSEUDOCOLOR;
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TRACEMS3(cinfo, 1, JTRC_RLE_MAPPED, width, height,
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1 << source->header.cmaplen);
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} else if (source->header.ncolors == 3 && source->header.ncmap == 3) {
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source->visual = TRUECOLOR;
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TRACEMS3(cinfo, 1, JTRC_RLE_FULLMAP, width, height,
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1 << source->header.cmaplen);
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} else if (source->header.ncolors == 3 && source->header.ncmap == 0) {
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source->visual = DIRECTCOLOR;
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TRACEMS2(cinfo, 1, JTRC_RLE, width, height);
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} else
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ERREXIT(cinfo, JERR_RLE_UNSUPPORTED);
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if (source->visual == GRAYSCALE || source->visual == MAPPEDGRAY) {
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cinfo->in_color_space = JCS_GRAYSCALE;
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cinfo->input_components = 1;
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} else {
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cinfo->in_color_space = JCS_RGB;
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cinfo->input_components = 3;
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}
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/*
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* A place to hold each scanline while it's converted.
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* (GRAYSCALE scanlines don't need converting)
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*/
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if (source->visual != GRAYSCALE) {
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source->rle_row = (rle_pixel **)(*cinfo->mem->alloc_sarray)
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((j_common_ptr)cinfo, JPOOL_IMAGE,
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(JDIMENSION)width, (JDIMENSION)cinfo->input_components);
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}
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/* request a virtual array to hold the image */
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source->image = (*cinfo->mem->request_virt_sarray)
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((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE,
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(JDIMENSION)(width * source->header.ncolors),
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(JDIMENSION)height, (JDIMENSION)1);
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#ifdef PROGRESS_REPORT
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if (progress != NULL) {
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/* count file input as separate pass */
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progress->total_extra_passes++;
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}
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#endif
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source->pub.buffer_height = 1;
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}
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/*
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* Read one row of pixels.
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* Called only after load_image has read the image into the virtual array.
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* Used for GRAYSCALE, MAPPEDGRAY, TRUECOLOR, and DIRECTCOLOR images.
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*/
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METHODDEF(JDIMENSION)
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get_rle_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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rle_source_ptr source = (rle_source_ptr)sinfo;
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source->row--;
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source->pub.buffer = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr)cinfo, source->image, source->row, (JDIMENSION)1, FALSE);
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return 1;
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}
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/*
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* Read one row of pixels.
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* Called only after load_image has read the image into the virtual array.
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* Used for PSEUDOCOLOR images.
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*/
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METHODDEF(JDIMENSION)
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get_pseudocolor_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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rle_source_ptr source = (rle_source_ptr)sinfo;
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JSAMPROW src_row, dest_row;
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JDIMENSION col;
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rle_map *colormap;
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int val;
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colormap = source->header.cmap;
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dest_row = source->pub.buffer[0];
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source->row--;
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src_row = *(*cinfo->mem->access_virt_sarray)
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((j_common_ptr)cinfo, source->image, source->row, (JDIMENSION)1, FALSE);
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for (col = cinfo->image_width; col > 0; col--) {
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val = GETJSAMPLE(*src_row++);
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*dest_row++ = (JSAMPLE)(colormap[val ] >> 8);
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*dest_row++ = (JSAMPLE)(colormap[val + 256] >> 8);
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*dest_row++ = (JSAMPLE)(colormap[val + 512] >> 8);
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}
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return 1;
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}
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/*
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* Load the image into a virtual array. We have to do this because RLE
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* files start at the lower left while the JPEG standard has them starting
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* in the upper left. This is called the first time we want to get a row
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* of input. What we do is load the RLE data into the array and then call
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* the appropriate routine to read one row from the array. Before returning,
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* we set source->pub.get_pixel_rows so that subsequent calls go straight to
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* the appropriate row-reading routine.
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*/
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METHODDEF(JDIMENSION)
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load_image(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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rle_source_ptr source = (rle_source_ptr)sinfo;
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JDIMENSION row, col;
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JSAMPROW scanline, red_ptr, green_ptr, blue_ptr;
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rle_pixel **rle_row;
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rle_map *colormap;
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char channel;
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#ifdef PROGRESS_REPORT
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cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;
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#endif
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colormap = source->header.cmap;
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rle_row = source->rle_row;
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/* Read the RLE data into our virtual array.
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* We assume here that rle_pixel is represented the same as JSAMPLE.
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*/
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RLE_CLR_BIT(source->header, RLE_ALPHA); /* don't read the alpha channel */
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#ifdef PROGRESS_REPORT
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if (progress != NULL) {
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progress->pub.pass_limit = cinfo->image_height;
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progress->pub.pass_counter = 0;
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(*progress->pub.progress_monitor) ((j_common_ptr)cinfo);
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}
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#endif
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switch (source->visual) {
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case GRAYSCALE:
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case PSEUDOCOLOR:
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for (row = 0; row < cinfo->image_height; row++) {
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rle_row = (rle_pixel **)(*cinfo->mem->access_virt_sarray)
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((j_common_ptr)cinfo, source->image, row, (JDIMENSION)1, TRUE);
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rle_getrow(&source->header, rle_row);
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#ifdef PROGRESS_REPORT
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if (progress != NULL) {
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progress->pub.pass_counter++;
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(*progress->pub.progress_monitor) ((j_common_ptr)cinfo);
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}
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#endif
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}
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break;
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case MAPPEDGRAY:
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case TRUECOLOR:
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for (row = 0; row < cinfo->image_height; row++) {
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scanline = *(*cinfo->mem->access_virt_sarray)
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((j_common_ptr)cinfo, source->image, row, (JDIMENSION)1, TRUE);
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rle_row = source->rle_row;
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rle_getrow(&source->header, rle_row);
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for (col = 0; col < cinfo->image_width; col++) {
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for (channel = 0; channel < source->header.ncolors; channel++) {
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*scanline++ = (JSAMPLE)
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(colormap[GETJSAMPLE(rle_row[channel][col]) + 256 * channel] >> 8);
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}
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}
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#ifdef PROGRESS_REPORT
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if (progress != NULL) {
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progress->pub.pass_counter++;
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(*progress->pub.progress_monitor) ((j_common_ptr)cinfo);
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}
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#endif
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}
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break;
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case DIRECTCOLOR:
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for (row = 0; row < cinfo->image_height; row++) {
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scanline = *(*cinfo->mem->access_virt_sarray)
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((j_common_ptr)cinfo, source->image, row, (JDIMENSION)1, TRUE);
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rle_getrow(&source->header, rle_row);
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red_ptr = rle_row[0];
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green_ptr = rle_row[1];
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blue_ptr = rle_row[2];
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for (col = cinfo->image_width; col > 0; col--) {
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*scanline++ = *red_ptr++;
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*scanline++ = *green_ptr++;
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*scanline++ = *blue_ptr++;
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}
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#ifdef PROGRESS_REPORT
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if (progress != NULL) {
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progress->pub.pass_counter++;
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(*progress->pub.progress_monitor) ((j_common_ptr)cinfo);
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}
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#endif
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}
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}
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#ifdef PROGRESS_REPORT
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if (progress != NULL)
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progress->completed_extra_passes++;
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#endif
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/* Set up to call proper row-extraction routine in future */
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if (source->visual == PSEUDOCOLOR) {
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source->pub.buffer = source->rle_row;
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source->pub.get_pixel_rows = get_pseudocolor_row;
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} else {
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source->pub.get_pixel_rows = get_rle_row;
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}
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source->row = cinfo->image_height;
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/* And fetch the topmost (bottommost) row */
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return (*source->pub.get_pixel_rows) (cinfo, sinfo);
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}
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/*
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* Finish up at the end of the file.
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*/
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METHODDEF(void)
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finish_input_rle(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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/* no work */
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}
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/*
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* The module selection routine for RLE format input.
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*/
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GLOBAL(cjpeg_source_ptr)
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jinit_read_rle(j_compress_ptr cinfo)
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{
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rle_source_ptr source;
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/* Create module interface object */
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source = (rle_source_ptr)
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(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
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sizeof(rle_source_struct));
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/* Fill in method ptrs */
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source->pub.start_input = start_input_rle;
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source->pub.finish_input = finish_input_rle;
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source->pub.get_pixel_rows = load_image;
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return (cjpeg_source_ptr)source;
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}
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#endif /* RLE_SUPPORTED */
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