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Pascal Engélibert 2025-07-26 22:14:37 +02:00
commit 7cdac8ded9
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//------------------------------------------------------------------------------
// File : ppm.cpp
//------------------------------------------------------------------------------
// GLVU : Copyright 1997 - 2002
// The University of North Carolina at Chapel Hill
//------------------------------------------------------------------------------
// Permission to use, copy, modify, distribute and sell this software and its
// documentation for any purpose is hereby granted without fee, provided that
// the above copyright notice appear in all copies and that both that copyright
// notice and this permission notice appear in supporting documentation.
// Binaries may be compiled with this software without any royalties or
// restrictions.
//
// The University of North Carolina at Chapel Hill makes no representations
// about the suitability of this software for any purpose. It is provided
// "as is" without express or implied warranty.
//============================================================================
// ppm.cpp : Portable Pixel Map image format module
//============================================================================
#include <stdio.h>
#define PPM_VERBOSE 0
//----------------------------------------------------------------------------
// READS AN IMAGE IN FROM A PPM FILE. RETURNS THE COLOR RGB ARRAY AND DIMENSIONS
// PERFORMS AUTO-ALLOCATION OF Color ARRAY IF SET TO NULL BEFORE CALLING; OTHERWISE
// ASSUMES THAT COLOR HAS BEEN PRE-ALLOCED.
//----------------------------------------------------------------------------
void LoadPPM(const char *FileName, unsigned char* &Color, int &Width, int &Height)
{
FILE* fp = fopen(FileName, "rb");
if (fp==NULL)
{ printf("PPM ERROR (ReadPPM) : unable to open %s!\n",FileName);
Color=NULL; Width=0; Height=0; return; }
int c,s;
do{ do { s=fgetc(fp); } while (s!='\n'); } while ((c=fgetc(fp))=='#');
ungetc(c,fp);
fscanf(fp, "%d %d\n255\n", &Width, &Height);
#if PPM_VERBOSE
printf("Reading %dx%d Texture [%s]. . .\n", Width, Height, FileName);
#endif
int NumComponents = Width*Height*3;
if (Color==NULL) Color = new unsigned char[NumComponents];
fread(Color,NumComponents,1,fp);
fclose(fp);
}
//----------------------------------------------------------------------------
// Writes an unsigned byte RGB color array out to a PPM file.
//----------------------------------------------------------------------------
void WritePPM(const char *FileName, unsigned char* Color, int Width, int Height)
{
FILE* fp = fopen(FileName, "wb");
if (fp==NULL) { printf("PPM ERROR (WritePPM) : unable to open %s!\n",FileName); return; }
fprintf(fp, "P6\n%d %d\n255\n", Width, Height);
fwrite(Color,1,Width*Height*3,fp);
fclose(fp);
}

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//------------------------------------------------------------------------------
// File : ppm.hpp
//------------------------------------------------------------------------------
// GLVU : Copyright 1997 - 2002
// The University of North Carolina at Chapel Hill
//------------------------------------------------------------------------------
// Permission to use, copy, modify, distribute and sell this software and its
// documentation for any purpose is hereby granted without fee, provided that
// the above copyright notice appear in all copies and that both that copyright
// notice and this permission notice appear in supporting documentation.
// Binaries may be compiled with this software without any royalties or
// restrictions.
//
// The University of North Carolina at Chapel Hill makes no representations
// about the suitability of this software for any purpose. It is provided
// "as is" without express or implied warranty.
//============================================================================
// ppm.hpp : Portable Pixel Map image format module
//============================================================================
void LoadPPM(const char *FileName, unsigned char* &Color, int &Width, int &Height);
void WritePPM(const char *FileName, unsigned char* Color, int Width, int Height);