gl2ppm.cpp

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// Gmsh - Copyright (C) 1997-2022 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file in the Gmsh root directory for license information.
// Please report all issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
 
#include "gl2ppm.h"
 
void create_ppm(FILE *outfile, PixelBuffer *buffer)
{
  if(buffer->getFormat() != GL_RGB || buffer->getType() != GL_UNSIGNED_BYTE) {
    Msg::Error("PPM only implemented for GL_RGB and GL_UNSIGNED_BYTE");
    return;
  }
 
  int width = buffer->getWidth();
  int height = buffer->getHeight();
  unsigned char *pixels = (unsigned char *)buffer->getPixels();
 
  fprintf(outfile, "P6\n");
  fprintf(outfile, "%d %d\n", width, height);
  fprintf(outfile, "%d\n", 255);
 
  int row_stride = width * 3;
  int i = height - 1;
  while(i >= 0) {
    fwrite(&pixels[i * row_stride], 1, row_stride, outfile);
    i--;
  }
}