stb_image_ex.c

#ifndef STBI_INCLUDE_STB_IMAGE_EX_H
#define STBI_INCLUDE_STB_IMAGE_EX_H

#ifdef __cplusplus
extern "C" {
#endif

typedef unsigned char stbi_uc;

extern void stbi_flip_y(int w, int h, int comp, stbi_uc *data);
extern void stbi_flip_y_f(int w, int h, int comp, float *data);

#ifdef __cplusplus
}
#endif

//
//
////   end header file   /////////////////////////////////////////////////////
#endif // STBI_INCLUDE_STB_IMAGE_EX_H

#ifndef STBI_HEADER_EX_FILE_ONLY

#include <stdlib.h>

void stbi_flip_y(int w, int h, int comp, stbi_uc *data)
{
   stbi_uc t;
   size_t y;
   size_t i;
   size_t stride = w * comp;
   stbi_uc *out = data;

   for (y = 0; y < (h>>1); ++y) {
      stbi_uc *p1 = out + y * stride;
      stbi_uc *p2 = out + (h-1-y) * stride;
      for (i = 0; i < stride; ++i) {
         t = p1[i];
         p1[i] = p2[i];
         p2[i] = t;       
      } 
   }
}

void stbi_flip_y_f(int w, int h, int comp, float *data)
{
   float t;
   size_t y;
   size_t i;
   size_t stride = w * comp;
   float *out = data;

   for (y = 0; y < (h>>1); ++y) {
      float *p1 = out + y * stride;
      float *p2 = out + (h-1-y) * stride;
      for (i = 0; i < stride; ++i) {
         t = p1[i];
         p1[i] = p2[i];
         p2[i] = t;       
      } 
   }
}

#endif // STBI_HEADER_EX_FILE_ONLY