--- /dev/null
+/*
+ * 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 */
projects / synfig.git / blobdiff