shithub: cstory

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stop checking for screen channel on each mask calcuation

Also RGBA32 aint worth the hassle. If someone runs in to
it then we can revist this.

--- a/src/Backends/Rendering/9front.cpp

+++ b/src/Backends/Rendering/9front.cpp

@@ -75,6 +75,16 @@

 	memimageinit();

 	if(initdraw(nil, nil, "cstory") < 0)

 		sysfatal("initdraw: %r");

+	switch(screen->chan){

+	case XRGB32:

+	case ARGB32:

+		break;

+	default:

+		/* TODO? */

+		sysfatal("unsupported screen color channel");

+		return;

+	}

+

 	resizec = chancreate(sizeof(int), 1);

 	mctl = initmouse(nil, screen);

 	if(mctl == nil)

@@ -187,6 +197,10 @@

 	surface->dirty = 1;

 }

+enum {

+	maskmask = 0xFFFFFF,

+};

+

 void RenderBackend_CalcMask(RenderBackend_Surface *s)

 {

 	Memimage *m;

@@ -193,23 +207,7 @@

 	Rectangle r;

 	int x, y, w, h;

 	ulong *lp;

-	ulong mask;

-	switch(s->i->chan){

-	case XRGB32:

-	case ARGB32:

-	case XBGR32:

-	case ABGR32:

-		mask = 0xFFFFFF;

-		break;

-	case RGBA32:

-		mask = 0xFFFFFF00;

-		break;

-	default:

-		/* TODO? */

-		sysfatal("< 32 bit screen color channel");

-		return;

-	}

 	r = s->i->r;

 	w = Dx(r);

 	h = Dy(r);

@@ -218,7 +216,7 @@

 	for(y = 0; y < h; y++)

 	for(x = 0; x < w; x++){

 		lp = m->data->base + y*w + x;

-		if((*lp & mask) == 0)

+		if((*lp & maskmask) == 0)

 			*lp = 0x00;

 		else

 			*lp = 0xFFFFFFFF;