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Use alpha channel if available.

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svn-id: r17354
This commit is contained in:
Marcus Comstedt 2005-04-03 19:41:20 +00:00
parent ac54a40ea2
commit d2214dca99
1 changed files with 48 additions and 16 deletions
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64
gui/newgui.cpp
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@ -311,25 +311,57 @@ void NewGui::blendRect(int x, int y, int w, int h, OverlayColor color, int level
if (!rect.isValidRect())
return;
int r, g, b;
uint8 ar, ag, ab;
_system->colorToRGB(color, ar, ag, ab);
r = ar * level;
g = ag * level;
b = ab * level;
if (_system->hasAlpha()) {
OverlayColor *ptr = getBasePtr(rect.left, rect.top);
int a, r, g, b;
uint8 aa, ar, ag, ab;
_system->colorToARGB(color, aa, ar, ag, ab);
a = aa*level/(level+1);
if (a < 1)
return;
r = ar * a;
g = ag * a;
b = ab * a;
h = rect.height();
w = rect.width();
while (h--) {
for (int i = 0; i < w; i++) {
_system->colorToRGB(ptr[i], ar, ag, ab);
ptr[i] = _system->RGBToColor((ar + r) / (level+1),
(ag + g) / (level+1),
(ab + b) / (level+1));
OverlayColor *ptr = getBasePtr(rect.left, rect.top);
h = rect.height();
w = rect.width();
while (h--) {
for (int i = 0; i < w; i++) {
_system->colorToARGB(ptr[i], aa, ar, ag, ab);
int a2 = aa + a - (a*aa)/255;
ptr[i] = _system->ARGBToColor(a2,
((255-a)*aa*ar/255+r)/a2,
((255-a)*aa*ag/255+g)/a2,
((255-a)*aa*ab/255+b)/a2);
}
ptr += _screenPitch;
}
ptr += _screenPitch;
} else {
int r, g, b;
uint8 ar, ag, ab;
_system->colorToRGB(color, ar, ag, ab);
r = ar * level;
g = ag * level;
b = ab * level;
OverlayColor *ptr = getBasePtr(rect.left, rect.top);
h = rect.height();
w = rect.width();
while (h--) {
for (int i = 0; i < w; i++) {
_system->colorToRGB(ptr[i], ar, ag, ab);
ptr[i] = _system->RGBToColor((ar + r) / (level+1),
(ag + g) / (level+1),
(ab + b) / (level+1));
}
ptr += _screenPitch;
}
}
#endif
}