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Originally committed to SVN as r300.

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This commit is contained in:
Rodrigo Braz Monteiro 2006-04-04 13:44:58 +00:00
parent a42321a7d9
commit 1cb231c6e9
1 changed files with 23 additions and 6 deletions
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29
prs/prs_video_frame.cpp
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@ -132,12 +132,29 @@ void PRSVideoFrame::Overlay(PRSVideoFrame *dstFrame,int x,int y,unsigned char al
dc3 = *(dst+2);
da = *(dst+3);
// Write colors
*dst++ = (sc1*a + dc1*ia)/255;
*dst++ = (sc2*a + dc2*ia)/255;
*dst++ = (sc3*a + dc3*ia)/255;
*dst++ = 255-(ia*(255-da)/255);
//*dst++ = da;
// Normal blend
if (blend == 0) {
*dst++ = (sc1*a + dc1*ia)/255; // Why does this work without cast to int? It should overflow...
*dst++ = (sc2*a + dc2*ia)/255;
*dst++ = (sc3*a + dc3*ia)/255;
*dst++ = 255-(ia*(255-da)/255);
}
// Add blend
else if (blend == 1) {
*dst++ = MIN(255,(int(sc1)*a + int(dc1))/255);
*dst++ = MIN(255,(int(sc2)*a + int(dc2))/255);
*dst++ = MIN(255,(int(sc3)*a + int(dc3))/255);
*dst++ = 255-(ia*(255-da)/255); // Is this correct?
}
// Subtract blend
else if (blend == 2) {
*dst++ = MAX(0,(int(dc1) - sc1*a)/255);
*dst++ = MAX(0,(int(dc2) - sc2*a)/255);
*dst++ = MAX(0,(int(dc3) - sc3*a)/255);
*dst++ = 255-(ia*(255-da)/255); // Is this correct?
}
}
}
}