You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
305 lines
9.0 KiB
305 lines
9.0 KiB
/* |
|
* 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 */
|
|
|