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Improve performance for delta_encoder

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This patch inline the case of the first line to drop the if() that was done
at each loop.
Some variable have been renamed for code clarity.
This commit is contained in:
Hardening
2014-01-14 09:44:38 +01:00
parent 6dfaa8eefa
commit c1a6eda740
1 changed files with 14 additions and 24 deletions
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38
libfreerdp/codec/planar.c
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@@ -618,41 +618,31 @@ int freerdp_bitmap_planar_compress_planes_rle(BYTE* inPlanes[4], int width, int
BYTE* freerdp_bitmap_planar_delta_encode_plane(BYTE* inPlane, int width, int height, BYTE* outPlane)
{
char s2c;
BYTE u2c;
int delta;
int i, j, k;
int y, x;
BYTE *outPtr, *srcPtr, *prevLinePtr;
if (!outPlane)
{
outPlane = (BYTE*) malloc(width * height);
}
k = 0;
// first line is copied as is
CopyMemory(outPlane, inPlane, width);
for (i = 0; i < height; i++)
outPtr = outPlane + width;
srcPtr = inPlane + width;
prevLinePtr = inPlane;
for (y = 1; y < height; y++)
{
for (j = 0; j < width; j++)
for (x = 0; x < width; x++, outPtr++, srcPtr++, prevLinePtr++)
{
if (i < 1)
{
delta = inPlane[j];
delta = *srcPtr - *prevLinePtr;
s2c = (delta >= 0) ? (char) delta : (char) (~((BYTE) (delta * -1)) + 1);
}
else
{
delta = inPlane[(i * width) + j] - inPlane[((i - 1) * width) + j];
s2c = (delta >= 0) ? (char) delta : (char) (~((BYTE) (-delta)) + 1);
s2c = (delta >= 0) ? (char) delta : (char) (~((BYTE) (delta * -1)) + 1);
s2c = (s2c >= 0) ? (s2c << 1) : (char) (((~((BYTE) s2c) + 1) << 1) - 1);
s2c = (s2c >= 0) ? (s2c << 1) : (char) (((~((BYTE) s2c) + 1) << 1) - 1);
}
u2c = (BYTE) s2c;
outPlane[(i * width) + j] = u2c;
k++;
*outPtr = (BYTE)s2c;
}
}