kc3-lang/libjpeg-turbo/jwrppm.c

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• Hash : cc7150e2
  Author :
  Date : 1993-02-18T00:00:00
  

  The Independent JPEG Group's JPEG software v4a
  

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• jwrppm.c

• /*
   * jwrppm.c
   *
   * Copyright (C) 1991, 1992, 1993, 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 PPM/PGM format.
   *
   * These routines may need modification for non-Unix environments or
   * specialized applications.  As they stand, they assume output to
   * an ordinary stdio stream.
   *
   * These routines are invoked via the methods put_pixel_rows, put_color_map,
   * and output_init/term.
   */
  
  #include "jinclude.h"
  
  #ifdef PPM_SUPPORTED
  
  
  /*
   * Haven't yet got around to making this work with text-format output,
   * hence cannot handle pixels wider than 8 bits.
   */
  
  #ifndef EIGHT_BIT_SAMPLES
    Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
  #endif
  
  
  /*
   * On most systems, writing individual bytes with putc() is drastically less
   * efficient than buffering a row at a time for fwrite().  But we must
   * allocate the row buffer in near data space on PCs, because we are assuming
   * small-data memory model, wherein fwrite() can't reach far memory.  If you
   * need to process very wide images on a PC, you may have to use the putc()
   * approach.  Also, there are still a few systems around wherein fwrite() is
   * actually implemented as a putc() loop, in which case this buffer is a waste
   * of space.  So the putc() method can be used by defining USE_PUTC_OUTPUT.
   */
  
  #ifndef USE_PUTC_OUTPUT
  static char * row_buffer;	/* holds 1 pixel row's worth of output */
  #endif
  
  
  /*
   * Write the file header.
   */
  
  METHODDEF void
  output_init (decompress_info_ptr cinfo)
  {
    if (cinfo->out_color_space == CS_GRAYSCALE) {
      /* emit header for raw PGM format */
      fprintf(cinfo->output_file, "P5\n%ld %ld\n%d\n",
  	    cinfo->image_width, cinfo->image_height, 255);
  #ifndef USE_PUTC_OUTPUT
      /* allocate space for row buffer: 1 byte/pixel */
      row_buffer = (char *) (*cinfo->emethods->alloc_small)
  			((size_t) (SIZEOF(char) * cinfo->image_width));
  #endif
    } else if (cinfo->out_color_space == CS_RGB) {
      /* emit header for raw PPM format */
      fprintf(cinfo->output_file, "P6\n%ld %ld\n%d\n",
  	    cinfo->image_width, cinfo->image_height, 255);
  #ifndef USE_PUTC_OUTPUT
      /* allocate space for row buffer: 3 bytes/pixel */
      row_buffer = (char *) (*cinfo->emethods->alloc_small)
  			((size_t) (3 * SIZEOF(char) * cinfo->image_width));
  #endif
    } else {
      ERREXIT(cinfo->emethods, "PPM output must be grayscale or RGB");
    }
  }
  
  
  /*
   * Write some pixel data.
   */
  
  #ifdef USE_PUTC_OUTPUT
  
  METHODDEF void
  put_pixel_rows (decompress_info_ptr cinfo, int num_rows,
  		JSAMPIMAGE pixel_data)
  {
    register FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr0, ptr1, ptr2;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr0 = pixel_data[0][row];
      ptr1 = pixel_data[1][row];
      ptr2 = pixel_data[2][row];
      for (col = width; col > 0; col--) {
        putc(GETJSAMPLE(*ptr0), outfile);
        ptr0++;
        putc(GETJSAMPLE(*ptr1), outfile);
        ptr1++;
        putc(GETJSAMPLE(*ptr2), outfile);
        ptr2++;
      }
    }
  }
  
  METHODDEF void
  put_gray_rows (decompress_info_ptr cinfo, int num_rows,
  	       JSAMPIMAGE pixel_data)
  {
    register FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr0;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr0 = pixel_data[0][row];
      for (col = width; col > 0; col--) {
        putc(GETJSAMPLE(*ptr0), outfile);
        ptr0++;
      }
    }
  }
  
  #else /* use row buffering */
  
  METHODDEF void
  put_pixel_rows (decompress_info_ptr cinfo, int num_rows,
  		JSAMPIMAGE pixel_data)
  {
    FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr0, ptr1, ptr2;
    register char * row_bufferptr;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr0 = pixel_data[0][row];
      ptr1 = pixel_data[1][row];
      ptr2 = pixel_data[2][row];
      row_bufferptr = row_buffer;
      for (col = width; col > 0; col--) {
        *row_bufferptr++ = (char) GETJSAMPLE(*ptr0++);
        *row_bufferptr++ = (char) GETJSAMPLE(*ptr1++);
        *row_bufferptr++ = (char) GETJSAMPLE(*ptr2++);
      }
      (void) JFWRITE(outfile, row_buffer, 3*width);
    }
  }
  
  METHODDEF void
  put_gray_rows (decompress_info_ptr cinfo, int num_rows,
  	       JSAMPIMAGE pixel_data)
  {
    FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr0;
    register char * row_bufferptr;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr0 = pixel_data[0][row];
      row_bufferptr = row_buffer;
      for (col = width; col > 0; col--) {
        *row_bufferptr++ = (char) GETJSAMPLE(*ptr0++);
      }
      (void) JFWRITE(outfile, row_buffer, width);
    }
  }
  
  #endif /* USE_PUTC_OUTPUT */
  
  
  /*
   * Write some pixel data when color quantization is in effect.
   */
  
  #ifdef USE_PUTC_OUTPUT
  
  METHODDEF void
  put_demapped_rgb (decompress_info_ptr cinfo, int num_rows,
  		  JSAMPIMAGE pixel_data)
  {
    register FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr;
    register JSAMPROW color_map0 = cinfo->colormap[0];
    register JSAMPROW color_map1 = cinfo->colormap[1];
    register JSAMPROW color_map2 = cinfo->colormap[2];
    register int pixval;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr = pixel_data[0][row];
      for (col = width; col > 0; col--) {
        pixval = GETJSAMPLE(*ptr++);
        putc(GETJSAMPLE(color_map0[pixval]), outfile);
        putc(GETJSAMPLE(color_map1[pixval]), outfile);
        putc(GETJSAMPLE(color_map2[pixval]), outfile);
      }
    }
  }
  
  METHODDEF void
  put_demapped_gray (decompress_info_ptr cinfo, int num_rows,
  		   JSAMPIMAGE pixel_data)
  {
    register FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr;
    register JSAMPROW color_map0 = cinfo->colormap[0];
    register int pixval;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr = pixel_data[0][row];
      for (col = width; col > 0; col--) {
        pixval = GETJSAMPLE(*ptr++);
        putc(GETJSAMPLE(color_map0[pixval]), outfile);
      }
    }
  }
  
  #else /* use row buffering */
  
  METHODDEF void
  put_demapped_rgb (decompress_info_ptr cinfo, int num_rows,
  		  JSAMPIMAGE pixel_data)
  {
    FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr;
    register char * row_bufferptr;
    register JSAMPROW color_map0 = cinfo->colormap[0];
    register JSAMPROW color_map1 = cinfo->colormap[1];
    register JSAMPROW color_map2 = cinfo->colormap[2];
    register int pixval;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr = pixel_data[0][row];
      row_bufferptr = row_buffer;
      for (col = width; col > 0; col--) {
        pixval = GETJSAMPLE(*ptr++);
        *row_bufferptr++ = (char) GETJSAMPLE(color_map0[pixval]);
        *row_bufferptr++ = (char) GETJSAMPLE(color_map1[pixval]);
        *row_bufferptr++ = (char) GETJSAMPLE(color_map2[pixval]);
      }
      (void) JFWRITE(outfile, row_buffer, 3*width);
    }
  }
  
  METHODDEF void
  put_demapped_gray (decompress_info_ptr cinfo, int num_rows,
  		   JSAMPIMAGE pixel_data)
  {
    FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr;
    register char * row_bufferptr;
    register JSAMPROW color_map0 = cinfo->colormap[0];
    register int pixval;
    register long col;
    long width = cinfo->image_width;
    int row;
    
    for (row = 0; row < num_rows; row++) {
      ptr = pixel_data[0][row];
      row_bufferptr = row_buffer;
      for (col = width; col > 0; col--) {
        pixval = GETJSAMPLE(*ptr++);
        *row_bufferptr++ = (char) GETJSAMPLE(color_map0[pixval]);
      }
      (void) JFWRITE(outfile, row_buffer, width);
    }
  }
  
  #endif /* USE_PUTC_OUTPUT */
  
  
  /*
   * Write the color map.
   * For PPM output, we just remember to demap the output data!
   */
  
  METHODDEF void
  put_color_map (decompress_info_ptr cinfo, int num_colors, JSAMPARRAY colormap)
  {
    if (cinfo->out_color_space == CS_RGB)
      cinfo->methods->put_pixel_rows = put_demapped_rgb;
    else
      cinfo->methods->put_pixel_rows = put_demapped_gray;
  }
  
  
  /*
   * Finish up at the end of the file.
   */
  
  METHODDEF void
  output_term (decompress_info_ptr cinfo)
  {
    /* No work except to make sure we wrote the output file OK; */
    /* we let free_all release any workspace */
    fflush(cinfo->output_file);
    if (ferror(cinfo->output_file))
      ERREXIT(cinfo->emethods, "Output file write error --- out of disk space?");
  }
  
  
  /*
   * The method selection routine for PPM format output.
   * This should be called from d_ui_method_selection if PPM output is wanted.
   */
  
  GLOBAL void
  jselwppm (decompress_info_ptr cinfo)
  {
    cinfo->methods->output_init = output_init;
    cinfo->methods->put_color_map = put_color_map;
    if (cinfo->out_color_space == CS_RGB)
      cinfo->methods->put_pixel_rows = put_pixel_rows;
    else
      cinfo->methods->put_pixel_rows = put_gray_rows;
    cinfo->methods->output_term = output_term;
  }
  
  #endif /* PPM_SUPPORTED */
  

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