xlColor PixelBufferClass::mixColors(const wxCoord &x, const wxCoord &y, const xlColor &fg, const xlColor &c1, int layer)
{
static const int n = 0; //increase to change the curve of the crossfade
xlColor c0 = fg;
HSVValue hsv0;
HSVValue hsv1;
bool handlesAlpha = MixTypeHandlesAlpha(layers[layer]->mixType);
if (!handlesAlpha && layers[layer]->fadeFactor != 1.0)
{
//need to fade the first here as we're not mixing anything
hsv0 = c0.asHSV();
hsv0.value *= layers[layer]->fadeFactor;
c0 = hsv0;
}
float svthresh = layers[layer]->effectMixThreshold;
if (layers[layer]->effectMixVaries)
{
//vary mix threshold gradually during effect interval -DJ
layers[layer]->effectMixThreshold = layers[layer]->buffer.GetEffectTimeIntervalPosition();
}
if (layers[layer]->effectMixThreshold < 0)
{
layers[layer]->effectMixThreshold = 0;
}
xlColor c;
double emt, emtNot;
switch (layers[layer]->mixType)
{
case Mix_Normal:
c0.alpha = c0.alpha * layers[layer]->fadeFactor * (1.0 - layers[layer]->effectMixThreshold);
c = c0.AlphaBlend(c1);
break;
case Mix_Effect1:
case Mix_Effect2:
{
if (!layers[layer]->effectMixVaries)
{
emt = layers[layer]->effectMixThreshold;
if ((emt > 0.000001) && (emt < 0.99999))
{
emtNot = 1-layers[layer]->effectMixThreshold;
//make cross-fade linear
emt = cos((M_PI/4)*(pow(2*emt-1,2*n+1)+1));
emtNot = cos((M_PI/4)*(pow(2*emtNot-1,2*n+1)+1));
}
else
{
emtNot = layers[layer]->effectMixThreshold;
emt = 1 - layers[layer]->effectMixThreshold;
}
}
else
{
emt = layers[layer]->effectMixThreshold;
emtNot = 1-layers[layer]->effectMixThreshold;
}
xlColor c2(c1);
if (layers[layer]->mixType == Mix_Effect2)
{
c0.Set(c0.Red()*(emtNot),c0.Green()*(emtNot), c0.Blue()*(emtNot));
c2.Set(c1.Red()*(emt),c1.Green()*(emt), c1.Blue()*(emt));
}
else
{
c0.Set(c0.Red()*(emt),c0.Green()*(emt), c0.Blue()*(emt));
c2.Set(c1.Red()*(emtNot),c1.Green()*(emtNot), c1.Blue()*(emtNot));
}
c.Set(c0.Red()+c2.Red(), c0.Green()+c2.Green(), c0.Blue()+c2.Blue());
break;
}
case Mix_Mask1:
// first masks second
hsv0 = c0.asHSV();
if (hsv0.value <= layers[layer]->effectMixThreshold)
{
// only if effect 1 is black
c=c1; // then show the color of effect 2
}
else
{
c.Set(0, 0, 0);
}
break;
case Mix_Mask2:
// second masks first
hsv1 = c1.asHSV();
if (hsv1.value <= layers[layer]->effectMixThreshold)
{
c=c0;
}
else
{
c.Set(0, 0, 0);
}
break;
case Mix_Unmask1:
// first unmasks second
c0.toHSV(hsv0);
c1.toHSV(hsv1);
if (hsv0.value > layers[layer]->effectMixThreshold)
{
// if effect 1 is non black
hsv1.value = hsv0.value;
c = hsv1;
}
else
{
c.Set(0, 0, 0);
}
break;
case Mix_Unmask2:
// second unmasks first
c0.toHSV(hsv0);
c1.toHSV(hsv1);
if (hsv1.value > layers[layer]->effectMixThreshold)
{
// if effect 2 is non black
hsv0.value = hsv1.value;
c = hsv0;
}
else
{
c.Set(0, 0, 0);
}
break;
case Mix_Shadow_1on2:
// Effect 1 shadows onto effect 2
c0.toHSV(hsv0);
c1.toHSV(hsv1);
// if (hsv0.value > effectMixThreshold[layer]) {
// if effect 1 is non black
// to shadow we will shift the hue on the primary layer using the hue and brightness from the
// other layer
if(hsv0.value>0.0) hsv1.hue = hsv1.hue + (hsv0.value*(hsv1.hue-hsv0.hue))/5.0;
// hsv1.value = hsv0.value;
//hsv1.saturation = hsv0.saturation;
c = hsv1;
// }
break;
case Mix_Shadow_2on1:
// Effect 2 shadows onto effect 1
c0.toHSV(hsv0);
c1.toHSV(hsv1);
//if (hsv1.value > effectMixThreshold[layer]) {
// if effect 1 is non black
if(hsv1.value>0.0) hsv0.hue = hsv0.hue + (hsv1.value*(hsv0.hue-hsv1.hue))/2.0;
//hsv0.value = hsv1.value;
//hsv0.saturation = hsv1.saturation;
c = hsv0;
// }
break;
case Mix_Layered:
c1.toHSV(hsv1);
if (hsv1.value <= layers[layer]->effectMixThreshold)
{
c=c0;
}
else
{
c=c1;
}
break;
case Mix_Average:
// only average when both colors are non-black
if (c0 == xlBLACK)
{
c=c1;
}
else if (c1 == xlBLACK)
{
c=c0;
}
else
{
c.Set( (c0.Red()+c1.Red())/2, (c0.Green()+c1.Green())/2, (c0.Blue()+c1.Blue())/2 );
}
break;
case Mix_BottomTop:
c= y < layers[layer]->BufferHt/2 ? c0 : c1;
break;
case Mix_LeftRight:
c= x < layers[layer]->BufferWi/2 ? c0 : c1;
break;
case Mix_1_reveals_2:
c0.toHSV(hsv0);
c = hsv0.value > layers[layer]->effectMixThreshold ? c0 : c1; // if effect 1 is non black
break;
case Mix_2_reveals_1:
c1.toHSV(hsv1);
c = hsv1.value > layers[layer]->effectMixThreshold ? c1 : c0; // if effect 2 is non black
break;
}
if (layers[layer]->effectMixVaries)
{
layers[layer]->effectMixThreshold = svthresh; //put it back afterwards in case next row didn't change it
}
return c;
}
