| /* |
| * wrrle.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1996, Thomas G. Lane. |
| * It was modified by The libjpeg-turbo Project to include only code and |
| * information relevant to libjpeg-turbo. |
| * 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 |
| (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 rle_pixel is represented the same as JSAMPLE. |
| */ |
| |
| #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 */ |