1 files changed, 305 insertions, 0 deletions

diff --git a/libjpegtwrp/wrrle.c b/libjpegtwrp/wrrle.c
new file mode 100644
index 000000000..a4e73372d
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+++ b/libjpegtwrp/wrrle.c
@@ -0,0 +1,305 @@
+/*
+ * 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 */