static int planar_skip_plane_rle(const BYTE* pSrcData, UINT32 SrcSize, int nWidth, int nHeight)
{
int x, y;
int cRawBytes;
int nRunLength;
BYTE controlByte;
const BYTE* pRLE = pSrcData;
const BYTE* pEnd = &pSrcData[SrcSize];
for (y = 0; y < nHeight; y++)
{
for (x = 0; x < nWidth; )
{
if (pRLE >= pEnd)
return -1;
controlByte = *pRLE++;
nRunLength = PLANAR_CONTROL_BYTE_RUN_LENGTH(controlByte);
cRawBytes = PLANAR_CONTROL_BYTE_RAW_BYTES(controlByte);
if (nRunLength == 1)
{
nRunLength = cRawBytes + 16;
cRawBytes = 0;
}
else if (nRunLength == 2)
{
nRunLength = cRawBytes + 32;
cRawBytes = 0;
}
pRLE += cRawBytes;
x += cRawBytes;
cRawBytes = 0;
x += nRunLength;
nRunLength = 0;
if (x > nWidth)
return -1;
if (pRLE > pEnd)
return -1;
}
}
return (int) (pRLE - pSrcData);
}
static INT32 planar_decompress_plane_rle(const BYTE* pSrcData, UINT32 SrcSize,
BYTE* pDstData, INT32 nDstStep,
UINT32 nXDst, UINT32 nYDst,
UINT32 nWidth, UINT32 nHeight,
UINT32 nChannel, BOOL vFlip)
{
UINT32 x, y;
BYTE* dstp;
UINT32 pixel;
UINT32 cRawBytes;
UINT32 nRunLength;
INT32 deltaValue;
INT32 beg, end, inc;
BYTE controlByte;
BYTE* currentScanline;
BYTE* previousScanline;
const BYTE* srcp = pSrcData;
dstp = pDstData;
previousScanline = NULL;
if (vFlip)
{
beg = nHeight - 1;
end = -1;
inc = -1;
}
else
{
beg = 0;
end = nHeight;
inc = 1;
}
for (y = beg; y != end; y += inc)
{
dstp = &pDstData[((nYDst + y) * nDstStep) + (nXDst * 4) + nChannel];
pixel = 0;
currentScanline = dstp;
for (x = 0; x < nWidth;)
{
controlByte = *srcp;
srcp++;
if ((srcp - pSrcData) > SrcSize)
{
WLog_ERR(TAG, "error reading input buffer");
return -1;
}
nRunLength = PLANAR_CONTROL_BYTE_RUN_LENGTH(controlByte);
cRawBytes = PLANAR_CONTROL_BYTE_RAW_BYTES(controlByte);
if (nRunLength == 1)
{
nRunLength = cRawBytes + 16;
cRawBytes = 0;
}
else if (nRunLength == 2)
{
nRunLength = cRawBytes + 32;
cRawBytes = 0;
}
if (((dstp + (cRawBytes + nRunLength)) - currentScanline) > nWidth * 4)
{
WLog_ERR(TAG, "too many pixels in scanline");
return -1;
}
if (!previousScanline)
{
/* first scanline, absolute values */
while (cRawBytes > 0)
{
pixel = *srcp;
srcp++;
*dstp = pixel;
dstp += 4;
x++;
cRawBytes--;
}
while (nRunLength > 0)
{
*dstp = pixel;
dstp += 4;
x++;
nRunLength--;
}
}
else
{
/* delta values relative to previous scanline */
while (cRawBytes > 0)
{
deltaValue = *srcp;
srcp++;
if (deltaValue & 1)
{
deltaValue = deltaValue >> 1;
deltaValue = deltaValue + 1;
pixel = -deltaValue;
}
else
{
deltaValue = deltaValue >> 1;
pixel = deltaValue;
}
deltaValue = previousScanline[x * 4] + pixel;
*dstp = deltaValue;
dstp += 4;
x++;
cRawBytes--;
}
while (nRunLength > 0)
{
deltaValue = previousScanline[x * 4] + pixel;
*dstp = deltaValue;
dstp += 4;
x++;
nRunLength--;
}
}
}
