498 lines
18 KiB
C++
498 lines
18 KiB
C++
#include <osg/Image>
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#include <osg/Notify>
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#include <osg/Geode>
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#include <osg/GL>
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#include <osgDB/Registry>
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#include <osgDB/FileNameUtils>
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#include <osgDB/FileUtils>
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#include <sstream>
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/****************************************************************************
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*
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* Follows is code extracted from the simage library. Original Authors:
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*
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* Systems in Motion,
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* <URL:http://www.sim.no>
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*
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* Peder Blekken <pederb@sim.no>
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* Morten Eriksen <mortene@sim.no>
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* Marius Bugge Monsen <mariusbu@sim.no>
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*
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* The original COPYING notice
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*
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* All files in this library are public domain, except simage_rgb.cpp which is
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* Copyright (c) Mark J Kilgard <mjk@nvidia.com>. I will contact Mark
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* very soon to hear if this source also can become public domain.
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*
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* Please send patches for bugs and new features to: <pederb@sim.no>.
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*
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* Peder Blekken
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*
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*
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* Ported into the OSG as a plugin, Robert Osfield Decemeber 2000.
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* Note, reference above to license of simage_rgb is not relevent to the OSG
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* as the OSG does not use it. Also for patches, bugs and new features
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* please send them direct to the OSG dev team rather than address above.
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*
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**********************************************************************/
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/*
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* Based on example code found in the libjpeg archive
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*
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*/
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#include <stdio.h>
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extern "C"
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{
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#include <jpeglib.h>
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};
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#include <setjmp.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#define ERR_NO_ERROR 0
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#define ERR_OPEN 1
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#define ERR_MEM 2
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#define ERR_JPEGLIB 3
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static int jpegerror = ERR_NO_ERROR;
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int
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simage_jpeg_error(char * buffer, int buflen)
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{
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switch (jpegerror)
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{
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case ERR_OPEN:
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strncpy(buffer, "JPEG loader: Error opening file", buflen);
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break;
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case ERR_MEM:
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strncpy(buffer, "JPEG loader: Out of memory error", buflen);
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break;
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case ERR_JPEGLIB:
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strncpy(buffer, "JPEG loader: Illegal jpeg file", buflen);
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break;
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}
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return jpegerror;
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}
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struct my_error_mgr
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{
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struct jpeg_error_mgr pub; /* "public" fields */
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jmp_buf setjmp_buffer; /* for return to caller */
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};
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typedef struct my_error_mgr * my_error_ptr;
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static void
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my_error_exit (j_common_ptr cinfo)
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{
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/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
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my_error_ptr myerr = (my_error_ptr) cinfo->err;
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/* Always display the message. */
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/* We could postpone this until after returning, if we chose. */
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/*(*cinfo->err->output_message) (cinfo);*/
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/* FIXME: get error messahe from jpeglib */
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/* Return control to the setjmp point */
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longjmp(myerr->setjmp_buffer, 1);
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}
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int
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simage_jpeg_identify(const char *,
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const unsigned char *header,
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int headerlen)
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{
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static unsigned char jpgcmp[] = {'J', 'F', 'I', 'F' };
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if (headerlen < 4) return 0;
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if (memcmp((const void*)&header[6],
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(const void*)jpgcmp, 4) == 0) return 1;
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return 0;
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}
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static unsigned char*
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copyScanline(unsigned char *currPtr, unsigned char *from, int cnt)
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{
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memcpy((void*)currPtr, (void*)from, cnt);
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currPtr -= cnt;
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return currPtr;
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}
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unsigned char *
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simage_jpeg_load(const char *filename,
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int *width_ret,
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int *height_ret,
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int *numComponents_ret)
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{
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int width;
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int height;
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unsigned char *currPtr;
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int format;
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/* This struct contains the JPEG decompression parameters and pointers to
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* working space (which is allocated as needed by the JPEG library).
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*/
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struct jpeg_decompress_struct cinfo;
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/* We use our private extension JPEG error handler.
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* Note that this struct must live as long as the main JPEG parameter
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* struct, to avoid dangling-pointer problems.
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*/
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struct my_error_mgr jerr;
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/* More stuff */
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FILE * infile; /* source file */
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JSAMPARRAY rowbuffer; /* Output row buffer */
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int row_stride; /* physical row width in output buffer */
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jpegerror = ERR_NO_ERROR;
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/* In this example we want to open the input file before doing anything else,
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* so that the setjmp() error recovery below can assume the file is open.
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* VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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* requires it in order to read binary files.
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*/
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if ((infile = fopen(filename, "rb")) == NULL)
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{
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jpegerror = ERR_OPEN;
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return NULL;
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}
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/* Step 1: allocate and initialize JPEG decompression object */
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/* We set up the normal JPEG error routines, then override error_exit. */
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cinfo.err = jpeg_std_error(&jerr.pub);
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jerr.pub.error_exit = my_error_exit;
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/* Establish the setjmp return context for my_error_exit to use. */
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if (setjmp(jerr.setjmp_buffer))
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{
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/* If we get here, the JPEG code has signaled an error.
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* We need to clean up the JPEG object, close the input file, and return.
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*/
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jpegerror = ERR_JPEGLIB;
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jpeg_destroy_decompress(&cinfo);
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fclose(infile);
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//if (buffer) delete [] buffer;
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return NULL;
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}
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// used to be before setjump above, but have moved to after to avoid compile warnings.
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unsigned char *buffer = NULL;
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/* Now we can initialize the JPEG decompression object. */
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jpeg_create_decompress(&cinfo);
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/* Step 2: specify data source (eg, a file) */
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jpeg_stdio_src(&cinfo, infile);
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/* Step 3: read file parameters with jpeg_read_header() */
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(void) jpeg_read_header(&cinfo, TRUE);
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/* We can ignore the return value from jpeg_read_header since
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* (a) suspension is not possible with the stdio data source, and
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* (b) we passed TRUE to reject a tables-only JPEG file as an error.
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* See libjpeg.doc for more info.
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*/
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/* Step 4: set parameters for decompression */
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/* In this example, we don't need to change any of the defaults set by
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* jpeg_read_header(), so we do nothing here.
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*/
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/* Step 5: Start decompressor */
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if (cinfo.jpeg_color_space == JCS_GRAYSCALE)
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{
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format = 1;
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cinfo.out_color_space = JCS_GRAYSCALE;
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}
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else /* use rgb */
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{
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format = 3;
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cinfo.out_color_space = JCS_RGB;
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}
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(void) jpeg_start_decompress(&cinfo);
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/* We can ignore the return value since suspension is not possible
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* with the stdio data source.
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*/
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/* We may need to do some setup of our own at this point before reading
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* the data. After jpeg_start_decompress() we have the correct scaled
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* output image dimensions available, as well as the output colormap
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* if we asked for color quantization.
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* In this example, we need to make an output work buffer of the right size.
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*/
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/* JSAMPLEs per row in output buffer */
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row_stride = cinfo.output_width * cinfo.output_components;
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/* Make a one-row-high sample array that will go away when done with image */
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rowbuffer = (*cinfo.mem->alloc_sarray)
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((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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width = cinfo.output_width;
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height = cinfo.output_height;
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buffer = currPtr = new unsigned char [width*height*cinfo.output_components];
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/* Step 6: while (scan lines remain to be read) */
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/* jpeg_read_scanlines(...); */
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/* Here we use the library's state variable cinfo.output_scanline as the
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* loop counter, so that we don't have to keep track ourselves.
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*/
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/* flip image upside down */
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if (buffer)
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{
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currPtr = buffer + row_stride * (cinfo.output_height-1);
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while (cinfo.output_scanline < cinfo.output_height)
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{
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/* jpeg_read_scanlines expects an array of pointers to scanlines.
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* Here the array is only one element long, but you could ask for
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* more than one scanline at a time if that's more convenient.
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*/
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(void) jpeg_read_scanlines(&cinfo, rowbuffer, 1);
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/* Assume put_scanline_someplace wants a pointer and sample count. */
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currPtr = copyScanline(currPtr, rowbuffer[0], row_stride);
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}
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}
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/* Step 7: Finish decompression */
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(void) jpeg_finish_decompress(&cinfo);
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/* We can ignore the return value since suspension is not possible
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* with the stdio data source.
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*/
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/* Step 8: Release JPEG decompression object */
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/* This is an important step since it will release a good deal of memory. */
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jpeg_destroy_decompress(&cinfo);
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/* After finish_decompress, we can close the input file.
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* Here we postpone it until after no more JPEG errors are possible,
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* so as to simplify the setjmp error logic above. (Actually, I don't
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* think that jpeg_destroy can do an error exit, but why assume anything...)
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*/
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fclose(infile);
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/* At this point you may want to check to see whether any corrupt-data
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* warnings occurred (test whether jerr.pub.num_warnings is nonzero).
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*/
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/* And we're done! */
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if (buffer)
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{
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*width_ret = width;
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*height_ret = height;
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*numComponents_ret = format;
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}
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else
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{
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jpegerror = ERR_MEM;
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}
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return buffer;
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}
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class ReaderWriterJPEG : public osgDB::ReaderWriter
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{
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WriteResult::WriteStatus write_JPEG_file (const char* filename,int image_width,int image_height,JSAMPLE* image_buffer,int quality = 100) const
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{
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/* This struct contains the JPEG compression parameters and pointers to
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* working space (which is allocated as needed by the JPEG library).
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* It is possible to have several such structures, representing multiple
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* compression/decompression processes, in existence at once. We refer
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* to any one struct (and its associated working data) as a "JPEG object".
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*/
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struct jpeg_compress_struct cinfo;
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/* This struct represents a JPEG error handler. It is declared separately
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* because applications often want to supply a specialized error handler
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* (see the second half of this file for an example). But here we just
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* take the easy way out and use the standard error handler, which will
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* print a message on stderr and call exit() if compression fails.
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* Note that this struct must live as long as the main JPEG parameter
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* struct, to avoid dangling-pointer problems.
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*/
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struct jpeg_error_mgr jerr;
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/* More stuff */
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FILE * outfile; /* target file */
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JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
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int row_stride; /* physical row width in image buffer */
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/* Step 1: allocate and initialize JPEG compression object */
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/* We have to set up the error handler first, in case the initialization
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* step fails. (Unlikely, but it could happen if you are out of memory.)
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* This routine fills in the contents of struct jerr, and returns jerr's
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* address which we place into the link field in cinfo.
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*/
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cinfo.err = jpeg_std_error(&jerr);
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/* Now we can initialize the JPEG compression object. */
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jpeg_create_compress(&cinfo);
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/* Step 2: specify data destination (eg, a file) */
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/* Note: steps 2 and 3 can be done in either order. */
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/* Here we use the library-supplied code to send compressed data to a
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* stdio stream. You can also write your own code to do something else.
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* VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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* requires it in order to write binary files.
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*/
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if (!(outfile = fopen(filename, "wb")))
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{
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return WriteResult::ERROR_IN_WRITING_FILE;
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}
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jpeg_stdio_dest(&cinfo, outfile);
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/* Step 3: set parameters for compression */
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/* First we supply a description of the input image.
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* Four fields of the cinfo struct must be filled in:
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*/
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cinfo.image_width = image_width; /* image width and height, in pixels */
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cinfo.image_height = image_height;
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cinfo.input_components = 3; /* # of color components per pixel */
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cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
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/* Now use the library's routine to set default compression parameters.
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* (You must set at least cinfo.in_color_space before calling this,
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* since the defaults depend on the source color space.)
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*/
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jpeg_set_defaults(&cinfo);
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/* Now you can set any non-default parameters you wish to.
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* Here we just illustrate the use of quality (quantization table) scaling:
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*/
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jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
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/* Step 4: Start compressor */
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/* TRUE ensures that we will write a complete interchange-JPEG file.
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* Pass TRUE unless you are very sure of what you're doing.
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*/
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jpeg_start_compress(&cinfo, TRUE);
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/* Step 5: while (scan lines remain to be written) */
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/* jpeg_write_scanlines(...); */
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/* Here we use the library's state variable cinfo.next_scanline as the
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* loop counter, so that we don't have to keep track ourselves.
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* To keep things simple, we pass one scanline per call; you can pass
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* more if you wish, though.
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*/
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row_stride = image_width * 3; /* JSAMPLEs per row in image_buffer */
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while (cinfo.next_scanline < cinfo.image_height)
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{
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/* jpeg_write_scanlines expects an array of pointers to scanlines.
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* Here the array is only one element long, but you could pass
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* more than one scanline at a time if that's more convenient.
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*/
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row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
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(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
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}
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/* Step 6: Finish compression */
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jpeg_finish_compress(&cinfo);
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/* After finish_compress, we can close the output file. */
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fclose(outfile);
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/* Step 7: release JPEG compression object */
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/* This is an important step since it will release a good deal of memory. */
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jpeg_destroy_compress(&cinfo);
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/* And we're done! */
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return WriteResult::FILE_SAVED;
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}
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int getQuality(const osgDB::ReaderWriter::Options *options) const {
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if(options) {
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std::istringstream iss(options->getOptionString());
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std::string opt;
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while (iss >> opt) {
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if(opt=="JPEG_QUALITY") {
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int quality;
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iss >> quality;
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return quality;
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}
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}
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}
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return 100;
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}
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public:
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virtual const char* className() const { return "JPEG Image Reader/Writer"; }
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virtual bool acceptsExtension(const std::string& extension) const
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{
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return osgDB::equalCaseInsensitive(extension,"jpeg") || osgDB::equalCaseInsensitive(extension,"jpg");
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}
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virtual ReadResult readImage(const std::string& file, const osgDB::ReaderWriter::Options* options) const
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{
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std::string ext = osgDB::getLowerCaseFileExtension(file);
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if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;
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std::string fileName = osgDB::findDataFile( file, options );
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if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;
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unsigned char *imageData = NULL;
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int width_ret;
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int height_ret;
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int numComponents_ret;
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imageData = simage_jpeg_load(fileName.c_str(),&width_ret,&height_ret,&numComponents_ret);
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if (imageData==NULL) return ReadResult::FILE_NOT_HANDLED;
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int s = width_ret;
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int t = height_ret;
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int r = 1;
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//int internalFormat = numComponents_ret;
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int internalFormat =
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numComponents_ret == 1 ? GL_LUMINANCE :
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numComponents_ret == 2 ? GL_LUMINANCE_ALPHA :
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numComponents_ret == 3 ? GL_RGB :
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numComponents_ret == 4 ? GL_RGBA : (GLenum)-1;
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unsigned int pixelFormat =
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numComponents_ret == 1 ? GL_LUMINANCE :
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numComponents_ret == 2 ? GL_LUMINANCE_ALPHA :
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numComponents_ret == 3 ? GL_RGB :
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numComponents_ret == 4 ? GL_RGBA : (GLenum)-1;
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unsigned int dataType = GL_UNSIGNED_BYTE;
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osg::Image* pOsgImage = new osg::Image;
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pOsgImage->setFileName(fileName.c_str());
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pOsgImage->setImage(s,t,r,
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internalFormat,
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pixelFormat,
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dataType,
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imageData,
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osg::Image::USE_NEW_DELETE);
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return pOsgImage;
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}
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virtual WriteResult writeImage(const osg::Image &img,const std::string& fileName, const osgDB::ReaderWriter::Options *options) const
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{
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std::string ext = osgDB::getFileExtension(fileName);
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if (!acceptsExtension(ext)) return WriteResult::FILE_NOT_HANDLED;
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osg::ref_ptr<osg::Image> tmp_img = new osg::Image(img);
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tmp_img->flipVertical();
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WriteResult::WriteStatus ws = write_JPEG_file(fileName.c_str(),img.s(),img.t(),(JSAMPLE*)(tmp_img->data()),getQuality(options));
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return ws;
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}
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};
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// now register with Registry to instantiate the above
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// reader/writer.
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osgDB::RegisterReaderWriterProxy<ReaderWriterJPEG> g_readerWriter_JPEG_Proxy;
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