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Merge pull request #23 from hardening/planar_perf

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Improve performance for delta_encoder
This commit is contained in:
Marc-André Moreau 2014-01-14 08:40:14 -08:00
commit cab68b7ef7
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;
}
}