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-rw-r--r--jpg/rdrle.c387
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diff --git a/jpg/rdrle.c b/jpg/rdrle.c
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-/*
- * rdrle.c
- *
- * Copyright (C) 1991-1996, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains routines to read input images in Utah RLE format.
- * The Utah Raster Toolkit library is required (version 3.1 or later).
- *
- * These routines may need modification for non-Unix environments or
- * specialized applications. As they stand, they assume input from
- * an ordinary stdio stream. They further assume that reading begins
- * at the start of the file; start_input may need work if the
- * user interface has already read some data (e.g., to determine that
- * the file is indeed RLE format).
- *
- * Based on code contributed by Mike Lijewski,
- * with updates from Robert Hutchinson.
- */
-
-#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
-
-#ifdef RLE_SUPPORTED
-
-/* rle.h is provided by the Utah Raster Toolkit. */
-
-#include <rle.h>
-
-/*
- * We assume that JSAMPLE has the same representation as rle_pixel,
- * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples.
- */
-
-#if BITS_IN_JSAMPLE != 8
- Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
-#endif
-
-/*
- * We support the following types of RLE files:
- *
- * GRAYSCALE - 8 bits, no colormap
- * MAPPEDGRAY - 8 bits, 1 channel colomap
- * PSEUDOCOLOR - 8 bits, 3 channel colormap
- * TRUECOLOR - 24 bits, 3 channel colormap
- * DIRECTCOLOR - 24 bits, no colormap
- *
- * For now, we ignore any alpha channel in the image.
- */
-
-typedef enum
- { GRAYSCALE, MAPPEDGRAY, PSEUDOCOLOR, TRUECOLOR, DIRECTCOLOR } rle_kind;
-
-
-/*
- * Since RLE stores scanlines bottom-to-top, we have to invert the image
- * to conform to JPEG's top-to-bottom order. To do this, we read the
- * incoming image into a virtual array on the first get_pixel_rows call,
- * then fetch the required row from the virtual array on subsequent calls.
- */
-
-typedef struct _rle_source_struct * rle_source_ptr;
-
-typedef struct _rle_source_struct {
- struct cjpeg_source_struct pub; /* public fields */
-
- rle_kind visual; /* actual type of input file */
- jvirt_sarray_ptr image; /* virtual array to hold the image */
- JDIMENSION row; /* current row # in the virtual array */
- rle_hdr header; /* Input file information */
- rle_pixel** rle_row; /* holds a row returned by rle_getrow() */
-
-} rle_source_struct;
-
-
-/*
- * Read the file header; return image size and component count.
- */
-
-METHODDEF(void)
-start_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
-{
- rle_source_ptr source = (rle_source_ptr) sinfo;
- JDIMENSION width, height;
-#ifdef PROGRESS_REPORT
- cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
-#endif
-
- /* Use RLE library routine to get the header info */
- source->header = *rle_hdr_init(NULL);
- source->header.rle_file = source->pub.input_file;
- switch (rle_get_setup(&(source->header))) {
- case RLE_SUCCESS:
- /* A-OK */
- break;
- case RLE_NOT_RLE:
- ERREXIT(cinfo, JERR_RLE_NOT);
- break;
- case RLE_NO_SPACE:
- ERREXIT(cinfo, JERR_RLE_MEM);
- break;
- case RLE_EMPTY:
- ERREXIT(cinfo, JERR_RLE_EMPTY);
- break;
- case RLE_EOF:
- ERREXIT(cinfo, JERR_RLE_EOF);
- break;
- default:
- ERREXIT(cinfo, JERR_RLE_BADERROR);
- break;
- }
-
- /* Figure out what we have, set private vars and return values accordingly */
-
- width = source->header.xmax - source->header.xmin + 1;
- height = source->header.ymax - source->header.ymin + 1;
- source->header.xmin = 0; /* realign horizontally */
- source->header.xmax = width-1;
-
- cinfo->image_width = width;
- cinfo->image_height = height;
- cinfo->data_precision = 8; /* we can only handle 8 bit data */
-
- if (source->header.ncolors == 1 && source->header.ncmap == 0) {
- source->visual = GRAYSCALE;
- TRACEMS2(cinfo, 1, JTRC_RLE_GRAY, width, height);
- } else if (source->header.ncolors == 1 && source->header.ncmap == 1) {
- source->visual = MAPPEDGRAY;
- TRACEMS3(cinfo, 1, JTRC_RLE_MAPGRAY, width, height,
- 1 << source->header.cmaplen);
- } else if (source->header.ncolors == 1 && source->header.ncmap == 3) {
- source->visual = PSEUDOCOLOR;
- TRACEMS3(cinfo, 1, JTRC_RLE_MAPPED, width, height,
- 1 << source->header.cmaplen);
- } else if (source->header.ncolors == 3 && source->header.ncmap == 3) {
- source->visual = TRUECOLOR;
- TRACEMS3(cinfo, 1, JTRC_RLE_FULLMAP, width, height,
- 1 << source->header.cmaplen);
- } else if (source->header.ncolors == 3 && source->header.ncmap == 0) {
- source->visual = DIRECTCOLOR;
- TRACEMS2(cinfo, 1, JTRC_RLE, width, height);
- } else
- ERREXIT(cinfo, JERR_RLE_UNSUPPORTED);
-
- if (source->visual == GRAYSCALE || source->visual == MAPPEDGRAY) {
- cinfo->in_color_space = JCS_GRAYSCALE;
- cinfo->input_components = 1;
- } else {
- cinfo->in_color_space = JCS_RGB;
- cinfo->input_components = 3;
- }
-
- /*
- * A place to hold each scanline while it's converted.
- * (GRAYSCALE scanlines don't need converting)
- */
- if (source->visual != GRAYSCALE) {
- source->rle_row = (rle_pixel**) (*cinfo->mem->alloc_sarray)
- ((j_common_ptr) cinfo, JPOOL_IMAGE,
- (JDIMENSION) width, (JDIMENSION) cinfo->input_components);
- }
-
- /* request a virtual array to hold the image */
- source->image = (*cinfo->mem->request_virt_sarray)
- ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
- (JDIMENSION) (width * source->header.ncolors),
- (JDIMENSION) height, (JDIMENSION) 1);
-
-#ifdef PROGRESS_REPORT
- if (progress != NULL) {
- /* count file input as separate pass */
- progress->total_extra_passes++;
- }
-#endif
-
- source->pub.buffer_height = 1;
-}
-
-
-/*
- * Read one row of pixels.
- * Called only after load_image has read the image into the virtual array.
- * Used for GRAYSCALE, MAPPEDGRAY, TRUECOLOR, and DIRECTCOLOR images.
- */
-
-METHODDEF(JDIMENSION)
-get_rle_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
-{
- rle_source_ptr source = (rle_source_ptr) sinfo;
-
- source->row--;
- source->pub.buffer = (*cinfo->mem->access_virt_sarray)
- ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE);
-
- return 1;
-}
-
-/*
- * Read one row of pixels.
- * Called only after load_image has read the image into the virtual array.
- * Used for PSEUDOCOLOR images.
- */
-
-METHODDEF(JDIMENSION)
-get_pseudocolor_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
-{
- rle_source_ptr source = (rle_source_ptr) sinfo;
- JSAMPROW src_row, dest_row;
- JDIMENSION col;
- rle_map *colormap;
- int val;
-
- colormap = source->header.cmap;
- dest_row = source->pub.buffer[0];
- source->row--;
- src_row = * (*cinfo->mem->access_virt_sarray)
- ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE);
-
- for (col = cinfo->image_width; col > 0; col--) {
- val = GETJSAMPLE(*src_row++);
- *dest_row++ = (JSAMPLE) (colormap[val ] >> 8);
- *dest_row++ = (JSAMPLE) (colormap[val + 256] >> 8);
- *dest_row++ = (JSAMPLE) (colormap[val + 512] >> 8);
- }
-
- return 1;
-}
-
-
-/*
- * Load the image into a virtual array. We have to do this because RLE
- * files start at the lower left while the JPEG standard has them starting
- * in the upper left. This is called the first time we want to get a row
- * of input. What we do is load the RLE data into the array and then call
- * the appropriate routine to read one row from the array. Before returning,
- * we set source->pub.get_pixel_rows so that subsequent calls go straight to
- * the appropriate row-reading routine.
- */
-
-METHODDEF(JDIMENSION)
-load_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
-{
- rle_source_ptr source = (rle_source_ptr) sinfo;
- JDIMENSION row, col;
- JSAMPROW scanline, red_ptr, green_ptr, blue_ptr;
- rle_pixel **rle_row;
- rle_map *colormap;
- char channel;
-#ifdef PROGRESS_REPORT
- cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
-#endif
-
- colormap = source->header.cmap;
- rle_row = source->rle_row;
-
- /* Read the RLE data into our virtual array.
- * We assume here that (a) rle_pixel is represented the same as JSAMPLE,
- * and (b) we are not on a machine where FAR pointers differ from regular.
- */
- RLE_CLR_BIT(source->header, RLE_ALPHA); /* don't read the alpha channel */
-
-#ifdef PROGRESS_REPORT
- if (progress != NULL) {
- progress->pub.pass_limit = cinfo->image_height;
- progress->pub.pass_counter = 0;
- (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
- }
-#endif
-
- switch (source->visual) {
-
- case GRAYSCALE:
- case PSEUDOCOLOR:
- for (row = 0; row < cinfo->image_height; row++) {
- rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray)
- ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE);
- rle_getrow(&source->header, rle_row);
-#ifdef PROGRESS_REPORT
- if (progress != NULL) {
- progress->pub.pass_counter++;
- (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
- }
-#endif
- }
- break;
-
- case MAPPEDGRAY:
- case TRUECOLOR:
- for (row = 0; row < cinfo->image_height; row++) {
- scanline = * (*cinfo->mem->access_virt_sarray)
- ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE);
- rle_row = source->rle_row;
- rle_getrow(&source->header, rle_row);
-
- for (col = 0; col < cinfo->image_width; col++) {
- for (channel = 0; channel < source->header.ncolors; channel++) {
- *scanline++ = (JSAMPLE)
- (colormap[GETJSAMPLE(rle_row[channel][col]) + 256 * channel] >> 8);
- }
- }
-
-#ifdef PROGRESS_REPORT
- if (progress != NULL) {
- progress->pub.pass_counter++;
- (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
- }
-#endif
- }
- break;
-
- case DIRECTCOLOR:
- for (row = 0; row < cinfo->image_height; row++) {
- scanline = * (*cinfo->mem->access_virt_sarray)
- ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE);
- rle_getrow(&source->header, rle_row);
-
- red_ptr = rle_row[0];
- green_ptr = rle_row[1];
- blue_ptr = rle_row[2];
-
- for (col = cinfo->image_width; col > 0; col--) {
- *scanline++ = *red_ptr++;
- *scanline++ = *green_ptr++;
- *scanline++ = *blue_ptr++;
- }
-
-#ifdef PROGRESS_REPORT
- if (progress != NULL) {
- progress->pub.pass_counter++;
- (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
- }
-#endif
- }
- }
-
-#ifdef PROGRESS_REPORT
- if (progress != NULL)
- progress->completed_extra_passes++;
-#endif
-
- /* Set up to call proper row-extraction routine in future */
- if (source->visual == PSEUDOCOLOR) {
- source->pub.buffer = source->rle_row;
- source->pub.get_pixel_rows = get_pseudocolor_row;
- } else {
- source->pub.get_pixel_rows = get_rle_row;
- }
- source->row = cinfo->image_height;
-
- /* And fetch the topmost (bottommost) row */
- return (*source->pub.get_pixel_rows) (cinfo, sinfo);
-}
-
-
-/*
- * Finish up at the end of the file.
- */
-
-METHODDEF(void)
-finish_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
-{
- /* no work */
-}
-
-
-/*
- * The module selection routine for RLE format input.
- */
-
-GLOBAL(cjpeg_source_ptr)
-jinit_read_rle (j_compress_ptr cinfo)
-{
- rle_source_ptr source;
-
- /* Create module interface object */
- source = (rle_source_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(rle_source_struct));
- /* Fill in method ptrs */
- source->pub.start_input = start_input_rle;
- source->pub.finish_input = finish_input_rle;
- source->pub.get_pixel_rows = load_image;
-
- return (cjpeg_source_ptr) source;
-}
-
-#endif /* RLE_SUPPORTED */
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