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Optimized the YV12->RGB32 conversion in AegiVideoFrame

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Originally committed to SVN as r987.
This commit is contained in:
Rodrigo Braz Monteiro 2007-04-03 20:41:33 +00:00
parent 16ac9e6e21
commit 29923cb8e1
1 changed files with 7 additions and 15 deletions
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22
aegisub/video_frame.cpp
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@ -288,28 +288,20 @@ void AegiVideoFrame::ConvertFrom(const AegiVideoFrame &source) {
const int src_delta2 = source.pitch[1]-w/2;
const int src_delta3 = source.pitch[2]-w/2;
const int dst_delta = pitch[0]-w*4;
int r,g,b,y,u,v,c,d,e;
register int y,u,v;
// Loop
for (unsigned int py=0;py<h;py++) {
for (unsigned int px=0;px<w/2;px++) {
u = *src_u++;
v = *src_v++;
u = *src_u++ - 128;
v = *src_v++ - 128;
for (unsigned int i=0;i<2;i++) {
y = *src_y++;
// Convert
c = y - 16;
d = u - 128;
e = v - 128;
r = MID(0,( 298 * c + 409 * e + 128) >> 8,255);
g = MID(0,( 298 * c - 100 * d - 208 * e + 128) >> 8,255);
b = MID(0,( 298 * c + 516 * d + 128) >> 8,255);
y = (*src_y++ - 16) * 298;
// Assign
*dst++ = b;
*dst++ = g;
*dst++ = r;
*dst++ = MID(0,(y + 516 * u + 128) >> 8,255); // Blue
*dst++ = MID(0,(y - 100 * u - 208 * v + 128) >> 8,255); // Green
*dst++ = MID(0,(y + 409 * v + 128) >> 8,255); // Red
*dst++ = 0;
}
}