Do register reduction to re-normalize the performance at the low level
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4643 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/PixelFormat.cxx b/common/rfb/PixelFormat.cxx
index 013cceb..b51adab 100644
--- a/common/rfb/PixelFormat.cxx
+++ b/common/rfb/PixelFormat.cxx
@@ -315,27 +315,38 @@
bindex = blueShift/8;
}
- for(rowptr = (rdr::U8 *)src; rowptr < &src[pitch * h]; rowptr += pitch) {
- for(colptr = rowptr; colptr < &rowptr[w * 4]; colptr += 4) {
- *(dst++) = colptr[rindex];
- *(dst++) = colptr[gindex];
- *(dst++) = colptr[bindex];
+ int srcPad = pitch - w * 4;
+ while (h > 0) {
+ rdr::U8 *srcEndOfRow = (rdr::U8 *)src + w * 4;
+ while (src < srcEndOfRow) {
+ *(dst++) = src[rindex];
+ *(dst++) = src[gindex];
+ *(dst++) = src[bindex];
+ src += 4;
}
+ src += srcPad;
+ h--;
}
} else {
// Generic code
Pixel p;
rdr::U8 r, g, b;
+ int pixelSize = bpp/8;
- for(rowptr = (rdr::U8 *)src; rowptr < &src[pitch * h]; rowptr += pitch) {
- for(colptr = rowptr; colptr < &rowptr[w * bpp/8]; colptr += bpp/8) {
- p = pixelFromBuffer(colptr);
+ int srcPad = pitch - w * pixelSize;
+ while (h > 0) {
+ rdr::U8 *srcEndOfRow = (rdr::U8 *)src + w * pixelSize;
+ while (src < srcEndOfRow) {
+ p = pixelFromBuffer(src);
rgbFromPixel(p, cm, &r, &g, &b);
*(dst++) = r;
*(dst++) = g;
*(dst++) = b;
+ src += pixelSize;
}
+ src += srcPad;
+ h--;
}
}
}