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-rw-r--r--libjpegtwrp/wrrle.c305
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diff --git a/libjpegtwrp/wrrle.c b/libjpegtwrp/wrrle.c
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-/*
- * 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 */
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