/* Calculating the gamma by integrating the gamma ramps isn't exact,
so this function isn't officially supported.
*/
int SDL_GetGamma(float *red, float *green, float *blue)
{
int succeeded;
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
succeeded = -1;
#ifdef USE_MATH_H
/* Prefer using GetGammaRamp(), as it's more flexible */
{
Uint16 ramp[3][256];
succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]);
if ( succeeded >= 0 ) {
CalculateGammaFromRamp(red, ramp[0]);
CalculateGammaFromRamp(green, ramp[1]);
CalculateGammaFromRamp(blue, ramp[2]);
}
}
#else
SDL_SetError("Gamma correction not supported");
#endif
if ( (succeeded < 0) && video->GetGamma ) {
SDL_ClearError();
succeeded = video->GetGamma(this, red, green, blue);
}
return succeeded;
}
int SDL_GetGamma(float *red, float *green, float *blue)
{
int succeeded;
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
succeeded = -1;
/* Prefer using GetGammaRamp(), as it's more flexible */
{
Uint16 ramp[3][256];
succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]);
if ( succeeded >= 0 ) {
CalculateGammaFromRamp(red, ramp[0]);
CalculateGammaFromRamp(green, ramp[1]);
CalculateGammaFromRamp(blue, ramp[2]);
}
}
if ( (succeeded < 0) && video->GetGamma ) {
SDL_ClearError();
succeeded = video->GetGamma(this, red, green, blue);
}
return succeeded;
}