kc3-lang/libjpeg-turbo/jwrppm.c

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• Hash : bd543f03
  Author :
  Date : 1991-12-13T00:00:00
  

  The Independent JPEG Group's JPEG software v2
  

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• jwrppm.c

• /*
   * jwrppm.c
   *
   * Copyright (C) 1991, 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 format.
   * The PBMPLUS library is required (well, it will be in the real version).
   *
   * 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
  
  
  static JSAMPARRAY color_map;	/* saves color map passed by quantizer */
  
  
  /*
   * 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);
    } 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);
    } else {
      ERREXIT(cinfo->emethods, "PPM output must be grayscale or RGB");
    }
  }
  
  
  /*
   * Write some pixel data.
   */
  
  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;
    register long width = cinfo->image_width;
    register int row;
    
    if (cinfo->out_color_space == CS_GRAYSCALE) {
      for (row = 0; row < num_rows; row++) {
        ptr0 = pixel_data[0][row];
        for (col = width; col > 0; col--) {
  	putc(GETJSAMPLE(*ptr0), outfile);
  	ptr0++;
        }
      }
    } else {
      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++;
        }
      }
    }
  }
  
  
  /*
   * Write some pixel data when color quantization is in effect.
   */
  
  METHODDEF void
  put_demapped_rows (decompress_info_ptr cinfo, int num_rows,
  		   JSAMPIMAGE pixel_data)
  {
    register FILE * outfile = cinfo->output_file;
    register JSAMPROW ptr;
    register long col;
    register long width = cinfo->image_width;
    register int row;
    
    if (cinfo->out_color_space == CS_GRAYSCALE) {
      for (row = 0; row < num_rows; row++) {
        ptr = pixel_data[0][row];
        for (col = width; col > 0; col--) {
  	putc(GETJSAMPLE(color_map[0][GETJSAMPLE(*ptr)]), outfile);
  	ptr++;
        }
      }
    } else {
      for (row = 0; row < num_rows; row++) {
        ptr = pixel_data[0][row];
        for (col = width; col > 0; col--) {
  	register int pixval = GETJSAMPLE(*ptr);
  
  	putc(GETJSAMPLE(color_map[0][pixval]), outfile);
  	putc(GETJSAMPLE(color_map[1][pixval]), outfile);
  	putc(GETJSAMPLE(color_map[2][pixval]), outfile);
  	ptr++;
        }
      }
    }
  }
  
  
  /*
   * Write the color map.
   * For PPM output, we just demap the output data!
   */
  
  METHODDEF void
  put_color_map (decompress_info_ptr cinfo, int num_colors, JSAMPARRAY colormap)
  {
    color_map = colormap;		/* save for use in output */
    cinfo->methods->put_pixel_rows = put_demapped_rows;
  }
  
  
  /*
   * 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 */
    fflush(cinfo->output_file);
    if (ferror(cinfo->output_file))
      ERREXIT(cinfo->emethods, "Output file write error");
  }
  
  
  /*
   * 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;
    cinfo->methods->put_pixel_rows = put_pixel_rows;
    cinfo->methods->output_term = output_term;
  }
  
  #endif /* PPM_SUPPORTED */
  

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