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123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/*
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* Copyright (C) 1994-1995, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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* This code was taken from an example file.
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*
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*/
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#include "xp_core.h" //used to make library compile faster on win32 do not ifdef this or it wont work
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/*writejpg.c jpeg compression wrapper for jpeg compression utilities*/
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#include <stdio.h>
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#include <setjmp.h>/*for error handler*/
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#include "xp_core.h"/*defines of int32 ect*/
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#include "ntypes.h" /* for MWContext to include libcnv.h*/
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#include "libcnv.h"
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#include "writejpg.h"
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#include "..\jpeg\jinclude.h"
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#include "..\jpeg\jpeglib.h"
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//#include "jerror.h" /* get library error codes too */
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/* incomming data= (RGB,RGB,RGB)*/
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struct my_error_mgr {
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struct jpeg_error_mgr pub; /* "public" fields */
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jmp_buf setjmp_buffer; /* for return to caller */ /*must include setjmp*/
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};
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typedef struct my_error_mgr * my_error_ptr;
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/*
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* Here's the routine that will replace the standard error_exit method:
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*/
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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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/* Return control to the setjmp point */
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longjmp(myerr->setjmp_buffer, 1);
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}
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/*given an array of pixels, writes a jpeg file*/
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CONVERT_IMAGERESULT
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write_JPEG_file (CONVERT_IMG_ARRAY p_rowarray,CONVERT_IMGCONTEXT *output,CONVERT_IMG_INFO *p_imageinfo,CONVERT_CALLBACKS p_callbacks)
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{
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struct jpeg_compress_struct cinfo;
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struct my_error_mgr jerr;
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int16 row_stride; /* physical row width in image buffer */
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cinfo.err = jpeg_std_error((struct jpeg_error_mgr *)&jerr);
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jerr.pub.error_exit = my_error_exit;
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jerr.pub.output_message=p_callbacks.m_displaybuffercallback;
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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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/* 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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jpeg_close_file(&cinfo);
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jpeg_destroy_compress(&cinfo);
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return CONVERR_JPEGERROR;
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}
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/* Now we can initialize the JPEG compression object. */
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jpeg_create_compress(&cinfo);
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/* Here we use the library-supplied code to send compressed data to a
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* stdio stream.*/
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jpeg_file_dest(&cinfo, output->m_filename);
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cinfo.image_width = p_imageinfo->m_image_width; /* image width and height, in pixels */
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cinfo.image_height = p_imageinfo->m_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, output->m_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 = p_imageinfo->m_image_width * 3; /* JSAMPLEs per row in image_buffer */
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while (cinfo.next_scanline < cinfo.image_height)
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(void) jpeg_write_scanlines(&cinfo, (JSAMPARRAY)p_rowarray, cinfo.image_height);
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/* Step 6: Finish compression */
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jpeg_finish_compress(&cinfo);
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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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return CONV_OK;
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}
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