/* Simple plugin that inverts the colors of an image */

#include "EF.h"

/* This is called when the plugin is applied to an image.  The resulting
   image should go into outputImage.  We ignore v, the time-varying
   value set in the video editor */
void invert(EF_Image *originalImage, EF_Image *outputImage, float v)
{
    int x, y;

    /* For each pixel... */
    for (x = 0; x < originalImage->xSize; ++x)
      for (y = 0; y < originalImage->ySize; ++y) 
        {
          /* Get the pixel and extract r, g, b, and a */
          long pixel = EF_ImageXY(originalImage, x, y);
          int red = RED(pixel);
          int green = GREEN(pixel);
          int blue = BLUE(pixel);
          int alpha = ALPHA(pixel);

          /* invert r, g, and b.  Leave alpha alone */
          red = 255 - red;
          green = 255 - green;
          blue = 255 - blue;

          /* Pack the results back in the pixel */
          RED(pixel) = red;
          GREEN(pixel) = green;
          BLUE(pixel) = blue;

          /* Set the appropriate pixel of the output image */
          EF_ImageXY(outputImage, x, y) = pixel;
        }
}

/* Initialization code that is called when the plugin is loaded */
void pluginInit(EF_PluginOptions *options)
{
    if (options->structSize!=sizeof(EF_PluginOptions))
	{ puts("Plugin is wrong version"); return; }

    options->pluginApply = invert;
  
    strcpy(options->name,"Invert");

    options->hotkey='i';
}