/* NIGHTFALL OpenGL Interface */
/* Copyright (C) 2001 Rainer Wichmann & Markus Kuster */
/* */
/* This program is free software; you can redistribute it */
/* and/or modify */
/* it under the terms of the GNU General Public License as */
/* published by */
/* the Free Software Foundation; either version 2 of the License, or */
/* (at your option) any later version. */
/*
*/
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* ANSI C forbids an empty source file, so put this outside */
/* do nothing here if we don't have OpenGL */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Light.h"
#ifdef _WITH_OPENGL
#include <setjmp.h>
#include <GL/glut.h>
struct my_error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* for return to caller */
};
typedef struct my_error_mgr * my_error_ptr;
/*
* Here's the routine that will replace the standard error_exit method:
*/
METHODDEF(void)
my_error_exit (j_common_ptr cinfo)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
my_error_ptr myerr = (my_error_ptr) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
longjmp(myerr->setjmp_buffer, 1);
}
/******************************************************************
@package nightfall
@author Markus Kuster (kuster@astro.uni-tuebingen.de)
@version 1.0
@short Read a JPEG coded image file
@param (char) *filename the name of the image file
(int) *width pointer to the variable to store the
width of the image
(int) *height pointer to the variable to store the
height of the image
(int) *components number of color components per pixel
@return (GLubyte) *buffer pointer to the image buffer
containing the image
@heading Read a JPEG image from a file and decompress it. This code
is based on the example code example.c included in the
jpeg-library libjpeg-6.2.0.
*******************************************************************/
GLubyte *ReadJPEGFile(char *filename, int *width, int *height, int *components)
{
/* This struct contains the JPEG decompression parameters and pointers to
* working space (which is allocated as needed by the JPEG library).
*/
struct jpeg_decompress_struct cinfo;
/* We use our private extension JPEG error handler.
* Note that this struct must live as long as the main JPEG parameter
* struct, to avoid dangling-pointer problems.
*/
struct my_error_mgr jerr;
/* More stuff */
FILE * infile; /* source file */
JSAMPARRAY buffer; /* Output row buffer */
JSAMPLE *image_buffer; /* Array of R,G,B-order data */
char ErrMsg[256]; /* error message */
int row_stride; /* physical row width in output buffer */
long cont;
/* In this example we want to open the input file before doing anything else,
* so that the setjmp() error recovery below can assume the file is open.
* VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
* requires it in order to read binary files.
*/
if (!(infile = fopen(filename, "rb"))) {
sprintf(ErrMsg,_("Can't open jpeg file: %s \n"),filename);
WARNING (ErrMsg);
return(FALSE);
}
/* Step 1: allocate and initialize JPEG decompression object */
/* We set up the normal JPEG error routines, then override error_exit. */
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
sprintf(ErrMsg,_("JPEG code has signaled an error ! \n"));
WARNING (ErrMsg);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
return(FALSE);
}
/* Now we can initialize the JPEG decompression object. */
jpeg_create_decompress(&cinfo);
/* Step 2: specify data source (eg, a file) */
jpeg_stdio_src(&cinfo, infile);
/* Step 3: read file parameters with jpeg_read_header() */
(void) jpeg_read_header(&cinfo, TRUE);
/* We can ignore the return value from jpeg_read_header since
* (a) suspension is not possible with the stdio data source, and
* (b) we passed TRUE to reject a tables-only JPEG file as an error.
* See libjpeg.doc for more info.
*/
/* Step 4: set parameters for decompression */
/* In this example, we don't need to change any of the defaults set by
* jpeg_read_header(), so we do nothing here.
*/
/* Step 5: Start decompressor */
(void) jpeg_start_decompress(&cinfo);
/* We can ignore the return value since suspension is not possible
* with the stdio data source.
*/
/* We may need to do some setup of our own at this point before reading
* the data. After jpeg_start_decompress() we have the correct scaled
* output image dimensions available, as well as the output colormap
* if we asked for color quantization.
* In this example, we need to make an output work buffer of the right size.
*/
/* JSAMPLEs per row in output buffer */
row_stride = cinfo.output_width * cinfo.output_components;
/* Make a one-row-high sample array that will go away when done with image */
buffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
/* Allocate buffer for the full image */
image_buffer=(JSAMPLE *) malloc(cinfo.image_width*cinfo.image_height*cinfo.output_components);
if (!image_buffer) {
sprintf(ErrMsg,_("Can't allocate memory for image buffer !\n"));
WARNING (ErrMsg);
/* clean up and return savely */
jpeg_destroy_decompress(&cinfo);
fclose(infile);
return(FALSE);
}
/* Step 6: while (scan lines remain to be read) */
/* jpeg_read_scanlines(...); */
/* Here we use the library's state variable cinfo.output_scanline as the
* loop counter, so that we don't have to keep track ourselves.
*/
cont=cinfo.output_height-1;
while (cinfo.output_scanline < cinfo.output_height) {
/* jpeg_read_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could ask for
* more than one scanline at a time if that's more convenient.
*/
(void) jpeg_read_scanlines(&cinfo, buffer, 1);
/* copy buffer to the image storage area */
memcpy(image_buffer+cinfo.image_width*cinfo.output_components*cont,buffer[0],row_stride);
cont--;
}
/* Step 7: Finish decompression */
(void) jpeg_finish_decompress(&cinfo);
/* We can ignore the return value since suspension is not possible
* with the stdio data source.
*/
/* Step 8: Release JPEG decompression object */
/* This is an important step since it will release a good deal of memory. */
jpeg_destroy_decompress(&cinfo);
/* After finish_decompress, we can close the input file.
* Here we postpone it until after no more JPEG errors are possible,
* so as to simplify the setjmp error logic above. (Actually, I don't
* think that jpeg_destroy can do an error exit, but why assume anything...)
*/
if (infile) {
fclose(infile);
}
/* store number of color components per pixel */
*components=cinfo.output_components;
/* store image width and height */
*width=cinfo.image_width;
*height=cinfo.image_height;
/* At this point you may want to check to see whether any corrupt-data
* warnings occurred (test whether jerr.pub.num_warnings is nonzero).
*/
/* And we're done! */
return image_buffer;
}
/******************************************************************
@package nightfall
@author Markus Kuster (kuster@astro.uni-tuebingen.de)
@version 1.0
@short Write a JPEG coded image file
@param (char) *filename the name of the image file
(int) *width pointer to the variable to store the
width of the image
(int) *height pointer to the variable to store the
height of the image
(int) *components number of color components per pixel
@return (GLubyte) *buffer pointer to the image buffer
containing the image
@heading Compress a byte image and write it as jpeg file. This code
is based on the example code example.c included in the
jpeg-library libjpeg-6.2.0.
*******************************************************************/
int WriteJPEGFile(JSAMPLE * imgbuff, char *filename, int imgwidth,
int imgheight, int components, int quality)
{
/* This struct contains the JPEG compression parameters and pointers to
* working space (which is allocated as needed by the JPEG library).
* It is possible to have several such structures, representing multiple
* compression/decompression processes, in existence at once. We refer
* to any one struct (and its associated working data) as a "JPEG object".
*/
struct jpeg_compress_struct cinfo;
/* This struct represents a JPEG error handler. It is declared separately
* because applications often want to supply a specialized error handler
* (see the second half of this file for an example). But here we just
* take the easy way out and use the standard error handler, which will
* print a message on stderr and call exit() if compression fails.
* Note that this struct must live as long as the main JPEG parameter
* struct, to avoid dangling-pointer problems.
*/
struct my_error_mgr jerr;
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
int row_stride,line; /* physical row width in image buffer */
FILE *outfile; /* image file */
char ErrMsg[256]; /* error message */
/* open output file */
if (!(outfile = fopen(filename, "wb"))) {
sprintf(ErrMsg,_("Can't write jpeg file: %s \n"),filename);
WARNING (ErrMsg);
return(FALSE);
}
/* Step 1: allocate and initialize JPEG compression object */
/* We have to set up the error handler first, in case the initialization
* step fails. (Unlikely, but it could happen if you are out of memory.)
* This routine fills in the contents of struct jerr, and returns jerr's
* address which we place into the link field in cinfo.
*/
/* need an error handler b/o MPI - cannot exit() without killing
* all parallel processes R.W.
*/
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
sprintf(ErrMsg,_("JPEG code has signaled an error ! \n"));
WARNING (ErrMsg);
jpeg_destroy_compress(&cinfo);
fclose(outfile);
return(FALSE);
}
/* Now we can initialize the JPEG compression object. */
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, outfile);
/* Step 3: set parameters for compression */
/* First we supply a description of the input image.
* Four fields of the cinfo struct must be filled in:
*/
cinfo.image_width = imgwidth; /* image width and height, in pixels */
cinfo.image_height = imgheight;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
/* Now use the library's routine to set default compression parameters.
* (You must set at least cinfo.in_color_space before calling this,
* since the defaults depend on the source color space.)
*/
jpeg_set_defaults(&cinfo);
/* Now you can set any non-default parameters you wish to.
* Here we just illustrate the use of quality (quantization table) scaling:
*/
jpeg_set_quality(&cinfo, quality, TRUE ); /* limit to baseline-JPEG values */
/* Step 4: Start compressor */
/* TRUE ensures that we will write a complete interchange-JPEG file.
* Pass TRUE unless you are very sure of what you're doing.
*/
jpeg_start_compress(&cinfo, TRUE);
/* Step 5: while (scan lines remain to be written) */
/* jpeg_write_scanlines(...); */
/* Here we use the library's state variable cinfo.next_scanline as the
* loop counter, so that we don't have to keep track ourselves.
* To keep things simple, we pass one scanline per call; you can pass
* more if you wish, though.
*/
row_stride = imgwidth * 3; /* JSAMPLEs per row in imgbuff */
line = cinfo.image_height-1;
while (line >= 0) {
/* jpeg_write_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could pass
* more than one scanline at a time if that's more convenient.
*/
row_pointer[0] = & imgbuff[row_stride*line];
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
line--;
}
/* Step 6: Finish compression */
jpeg_finish_compress(&cinfo);
if (outfile) {
/* After finish_compress, we can close the output file. */
fclose(outfile);
}
/* Step 7: release JPEG compression object */
/* This is an important step since it will release a good deal of memory. */
jpeg_destroy_compress(&cinfo);
/* And we're done! */
return(TRUE);
}
#endif /* OpenGL end */
syntax highlighted by Code2HTML, v. 0.9.1