/* * wrrle.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 write output images in 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 output to * an ordinary stdio stream. * * 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/* * Since RLE stores scanlines bottom-to-top, we have to invert the image * from JPEG's top-to-bottom order.  To do this, we save the outgoing data * in a virtual array during put_pixel_row calls, then actually emit the * RLE file during finish_output. *//* * For now, if we emit an RLE color map then it is always 256 entries long, * though not all of the entries need be used. */#define CMAPBITS	8#define CMAPLENGTH	(1<<(CMAPBITS))typedef struct {  struct djpeg_dest_struct pub; /* public fields */  jvirt_sarray_ptr image;	/* virtual array to store the output image */  rle_map *colormap;	 	/* RLE-style color map, or NULL if none */  rle_pixel **rle_row;		/* To pass rows to rle_putrow() */} rle_dest_struct;typedef rle_dest_struct * rle_dest_ptr;/* Forward declarations */METHODDEF(void) rle_put_pixel_rows    JPP((j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,	 JDIMENSION rows_supplied));/* * Write the file header. * * In this module it's easier to wait till finish_output to write anything. */METHODDEF(void)start_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo){  rle_dest_ptr dest = (rle_dest_ptr) dinfo;  size_t cmapsize;  int i, ci;#ifdef PROGRESS_REPORT  cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;#endif  /*   * Make sure the image can be stored in RLE format.   *   * - RLE stores image dimensions as *signed* 16 bit integers.  JPEG   *   uses unsigned, so we have to check the width.   *   * - Colorspace is expected to be grayscale or RGB.   *   * - The number of channels (components) is expected to be 1 (grayscale/   *   pseudocolor) or 3 (truecolor/directcolor).   *   (could be 2 or 4 if using an alpha channel, but we aren't)   */  if (cinfo->output_width > 32767 || cinfo->output_height > 32767)    ERREXIT2(cinfo, JERR_RLE_DIMENSIONS, cinfo->output_width, 	     cinfo->output_height);  if (cinfo->out_color_space != JCS_GRAYSCALE &&      cinfo->out_color_space != JCS_RGB)    ERREXIT(cinfo, JERR_RLE_COLORSPACE);  if (cinfo->output_components != 1 && cinfo->output_components != 3)    ERREXIT1(cinfo, JERR_RLE_TOOMANYCHANNELS, cinfo->num_components);  /* Convert colormap, if any, to RLE format. */  dest->colormap = NULL;  if (cinfo->quantize_colors) {    /* Allocate storage for RLE-style cmap, zero any extra entries */    cmapsize = cinfo->out_color_components * CMAPLENGTH * SIZEOF(rle_map);    dest->colormap = (rle_map *) (*cinfo->mem->alloc_small)      ((j_common_ptr) cinfo, JPOOL_IMAGE, cmapsize);    MEMZERO(dest->colormap, cmapsize);    /* Save away data in RLE format --- note 8-bit left shift! */    /* Shifting would need adjustment for JSAMPLEs wider than 8 bits. */    for (ci = 0; ci < cinfo->out_color_components; ci++) {      for (i = 0; i < cinfo->actual_number_of_colors; i++) {        dest->colormap[ci * CMAPLENGTH + i] =          GETJSAMPLE(cinfo->colormap[ci][i]) << 8;      }    }  }  /* Set the output buffer to the first row */  dest->pub.buffer = (*cinfo->mem->access_virt_sarray)    ((j_common_ptr) cinfo, dest->image, (JDIMENSION) 0, (JDIMENSION) 1, TRUE);  dest->pub.buffer_height = 1;  dest->pub.put_pixel_rows = rle_put_pixel_rows;#ifdef PROGRESS_REPORT  if (progress != NULL) {    progress->total_extra_passes++;  /* count file writing as separate pass */  }#endif}/* * Write some pixel data. * * This routine just saves the data away in a virtual array. */METHODDEF(void)rle_put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,		    JDIMENSION rows_supplied){  rle_dest_ptr dest = (rle_dest_ptr) dinfo;  if (cinfo->output_scanline < cinfo->output_height) {    dest->pub.buffer = (*cinfo->mem->access_virt_sarray)      ((j_common_ptr) cinfo, dest->image,       cinfo->output_scanline, (JDIMENSION) 1, TRUE);  }}/* * Finish up at the end of the file. * * Here is where we really output the RLE file. */METHODDEF(void)finish_output_rle (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo){  rle_dest_ptr dest = (rle_dest_ptr) dinfo;  rle_hdr header;		/* Output file information */  rle_pixel **rle_row, *red, *green, *blue;  JSAMPROW output_row;  char cmapcomment[80];  int row, col;  int ci;#ifdef PROGRESS_REPORT  cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;#endif  /* Initialize the header info */  header = *rle_hdr_init(NULL);  header.rle_file = dest->pub.output_file;  header.xmin     = 0;  header.xmax     = cinfo->output_width  - 1;  header.ymin     = 0;  header.ymax     = cinfo->output_height - 1;  header.alpha    = 0;  header.ncolors  = cinfo->output_components;  for (ci = 0; ci < cinfo->output_components; ci++) {    RLE_SET_BIT(header, ci);  }  if (cinfo->quantize_colors) {    header.ncmap   = cinfo->out_color_components;    header.cmaplen = CMAPBITS;    header.cmap    = dest->colormap;    /* Add a comment to the output image with the true colormap length. */    sprintf(cmapcomment, "color_map_length=%d", cinfo->actual_number_of_colors);    rle_putcom(cmapcomment, &header);  }  /* Emit the RLE header and color map (if any) */  rle_put_setup(&header);  /* Now output the RLE data from 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.   */#ifdef PROGRESS_REPORT  if (progress != NULL) {    progress->pub.pass_limit = cinfo->output_height;    progress->pub.pass_counter = 0;    (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);  }#endif  if (cinfo->output_components == 1) {    for (row = cinfo->output_height-1; row >= 0; row--) {      rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray)        ((j_common_ptr) cinfo, dest->image,	 (JDIMENSION) row, (JDIMENSION) 1, FALSE);      rle_putrow(rle_row, (int) cinfo->output_width, &header);#ifdef PROGRESS_REPORT      if (progress != NULL) {        progress->pub.pass_counter++;        (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);      }#endif    }  } else {    for (row = cinfo->output_height-1; row >= 0; row--) {      rle_row = (rle_pixel **) dest->rle_row;      output_row = * (*cinfo->mem->access_virt_sarray)        ((j_common_ptr) cinfo, dest->image,	 (JDIMENSION) row, (JDIMENSION) 1, FALSE);      red = rle_row[0];      green = rle_row[1];      blue = rle_row[2];      for (col = cinfo->output_width; col > 0; col--) {        *red++ = GETJSAMPLE(*output_row++);        *green++ = GETJSAMPLE(*output_row++);        *blue++ = GETJSAMPLE(*output_row++);      }      rle_putrow(rle_row, (int) cinfo->output_width, &header);#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  /* Emit file trailer */  rle_puteof(&header);  fflush(dest->pub.output_file);  if (ferror(dest->pub.output_file))    ERREXIT(cinfo, JERR_FILE_WRITE);}/* * The module selection routine for RLE format output. */GLOBAL(djpeg_dest_ptr)jinit_write_rle (j_decompress_ptr cinfo){  rle_dest_ptr dest;  /* Create module interface object, fill in method pointers */  dest = (rle_dest_ptr)      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,                                  SIZEOF(rle_dest_struct));  dest->pub.start_output = start_output_rle;  dest->pub.finish_output = finish_output_rle;  /* Calculate output image dimensions so we can allocate space */  jpeg_calc_output_dimensions(cinfo);  /* Allocate a work array for output to the RLE library. */  dest->rle_row = (*cinfo->mem->alloc_sarray)    ((j_common_ptr) cinfo, JPOOL_IMAGE,     cinfo->output_width, (JDIMENSION) cinfo->output_components);  /* Allocate a virtual array to hold the image. */  dest->image = (*cinfo->mem->request_virt_sarray)    ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,     (JDIMENSION) (cinfo->output_width * cinfo->output_components),     cinfo->output_height, (JDIMENSION) 1);  return (djpeg_dest_ptr) dest;}#endif /* RLE_SUPPORTED */