jpegfile.cpp

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	/*           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.
	*/
	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);
		/* Assume put_scanline_someplace wants a pointer and sample count. */

		// asuumer all 3-components are RGBs
		if (cinfo.out_color_components==3) {
			
			j_putRGBScanline(buffer[0], 
								*width,
								dataBuf,
								cinfo.output_scanline-1);

		} else if (cinfo.out_color_components==1) {

			// assume all single component images are grayscale
			j_putGrayScanlineToRGB(buffer[0], 
								*width,
								dataBuf,
								cinfo.output_scanline-1);

		}

	}

	/* 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...)
	*/
	fclose(infile);

	/* At this point you may want to check to see whether any corrupt-data
	* warnings occurred (test whether jerr.pub.num_warnings is nonzero).
	*/
	return dataBuf;
}

BOOL JpegFile::GetJPGDimensions(CString fileName,
								UINT *width,
								UINT *height)

{
	// basic code from IJG Jpeg Code v6 example.c

	/* 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=NULL;		/* source file */
	char buf[250];

	/* 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")) == NULL) {
		sprintf(buf, "JPEG :\nCan't open %s\n", fileName);
		AfxMessageBox(buf);
		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.
		 */

		jpeg_destroy_decompress(&cinfo);

		if (infile!=NULL)
			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.
	*/


	// how big is this thing ?
	*width = cinfo.image_width;
	*height = cinfo.image_height;

	/* 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...)
	*/
	fclose(infile);

	/* At this point you may want to check to see whether any corrupt-data
	* warnings occurred (test whether jerr.pub.num_warnings is nonzero).
	*/

	return TRUE;
}

//
//
//

BYTE *JpegFile::RGBFromDWORDAligned(BYTE *inBuf,
									UINT widthPix, 
									UINT widthBytes,
									UINT height)
{
	if (inBuf==NULL)
		return FALSE;


	BYTE *tmp;
	tmp=(BYTE *)new BYTE[height * widthPix * 3];
	if (tmp==NULL)
		return NULL;

	UINT row;

	for (row=0;row<height;row++) {
		memcpy((tmp+row * widthPix * 3), 
				(inBuf + row * widthBytes), 
				widthPix * 3);
	}

	return tmp;
}

//
//
//
BOOL JpegFile::GryToJpegFile(CString fileName, 
							BYTE *dataBuf,
							UINT widthPix,
							UINT height,
							int quality)
{
	if (dataBuf==NULL)
		return FALSE;
	if (widthPix==0)
		return FALSE;
	if (height==0)
		return FALSE;


	struct jpeg_compress_struct cinfo;
	/* More stuff */
	FILE * outfile=NULL;			/* target file */
	int row_stride;			/* physical row widthPix in image buffer */

	struct my_error_mgr jerr;

	/* Step 1: allocate and initialize JPEG compression object */
	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.
		 */

		jpeg_destroy_compress(&cinfo);

		if (outfile!=NULL)
			fclose(outfile);

		return FALSE;
	}

	/* Now we can initialize the JPEG compression object. */
	jpeg_create_compress(&cinfo);

	/* Step 2: specify data destination (eg, a file) */
	/* Note: steps 2 and 3 can be done in either order. */

	if ((outfile = fopen(fileName, "wb")) == NULL) {
		char buf[250];
		sprintf(buf, "JpegFile :\nCan't open %s\n", fileName);
		AfxMessageBox(buf);
		return FALSE;
	}

	jpeg_stdio_dest(&cinfo, outfile);

	cinfo.image_width = widthPix; 	/* image widthPix and height, in pixels */
	cinfo.image_height = height;
		cinfo.input_components = 1;		/* # of color components per pixel */
		cinfo.in_color_space = JCS_GRAYSCALE; 	/* 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 = widthPix * 3;	/* JSAMPLEs per row in image_buffer */

  while (cinfo.next_scanline < cinfo.image_height) {
    /* 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.
     */
	LPBYTE outRow;
		outRow = dataBuf + (cinfo.next_scanline * widthPix );

    (void) jpeg_write_scanlines(&cinfo, &outRow, 1);
  }

  /* Step 6: Finish compression */

  jpeg_finish_compress(&cinfo);

  /* 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);


  return TRUE;
}


BOOL JpegFile::RGBToJpegFile(CString fileName, 
							BYTE *dataBuf,
							UINT widthPix,
							UINT height,
							BOOL color, 
							int quality)
{
	if (dataBuf==NULL)
		return FALSE;
	if (widthPix==0)
		return FALSE;
	if (height==0)
		return FALSE;

	LPBYTE tmp;
	if (!color) {
		tmp = (BYTE*)new BYTE[widthPix*height];
		if (tmp==NULL) {
			AfxMessageBox("Memory error");
			return FALSE;
		}

		UINT row,col;
		for (row=0;row<height;row++) {
			for (col=0;col<widthPix;col++) {
				LPBYTE pRed, pGrn, pBlu;
				pRed = dataBuf + row * widthPix * 3 + col * 3;
				pGrn = dataBuf + row * widthPix * 3 + col * 3 + 1;
				pBlu = dataBuf + row * widthPix * 3 + col * 3 + 2;

				// luminance
				int lum = (int)(.299 * (double)(*pRed) + .587 * (double)(*pGrn) + .114 * (double)(*pBlu));
				LPBYTE pGray;
				pGray = tmp + row * widthPix + col;
				*pGray = (BYTE)lum;
			}
		}
	}

	struct jpeg_compress_struct cinfo;
	/* More stuff */
	FILE * outfile=NULL;			/* target file */
	int row_stride;			/* physical row widthPix in image buffer */

	struct my_error_mgr jerr;

	/* Step 1: allocate and initialize JPEG compression object */
	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.
		 */

		jpeg_destroy_compress(&cinfo);

		if (outfile!=NULL)
			fclose(outfile);

		if (!color) {
			delete [] tmp;
		}
		return FALSE;
	}

	/* Now we can initialize the JPEG compression object. */
	jpeg_create_compress(&cinfo);

	/* Step 2: specify data destination (eg, a file) */
	/* Note: steps 2 and 3 can be done in either order. */

	if ((outfile = fopen(fileName, "wb")) == NULL) {
		char buf[250];
		sprintf(buf, "JpegFile :\nCan't open %s\n", fileName);
		AfxMessageBox(buf);
		return FALSE;
	}

	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 = widthPix; 	/* image widthPix and height, in pixels */
	cinfo.image_height = height;
	if (color) {
		cinfo.input_components = 3;		/* # of color components per pixel */
		cinfo.in_color_space = JCS_RGB; 	/* colorspace of input image */
	} else {
		cinfo.input_components = 1;		/* # of color components per pixel */
		cinfo.in_color_space = JCS_GRAYSCALE; 	/* 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.)