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Refactored YCoCg converstion

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Armin Novak 2021-03-17 13:12:51 +01:00 committed by akallabeth
parent 67dbb7907a
commit 317e334cc3
1 changed files with 18 additions and 18 deletions
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36
libfreerdp/primitives/prim_YCoCg.c
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@ -26,44 +26,44 @@
#include "prim_internal.h"
/* helper function to convert raw 8 bit values to signed 16bit values.
*/
static INT16 convert(UINT8 raw, int shift)
{
const int cll = shift - 1; /* -1 builds in the /2's */
return (INT16)((INT8)(raw << cll));
}
/* ------------------------------------------------------------------------- */
static pstatus_t general_YCoCgToRGB_8u_AC4R(const BYTE* pSrc, INT32 srcStep, BYTE* pDst,
UINT32 DstFormat, INT32 dstStep, UINT32 width,
UINT32 height, UINT8 shift, BOOL withAlpha)
{
BYTE A;
UINT32 x, y;
BYTE* dptr = pDst;
const BYTE* sptr = pSrc;
INT16 Cg, Co, Y, T, R, G, B;
const DWORD formatSize = GetBytesPerPixel(DstFormat);
fkt_writePixel writePixel = getPixelWriteFunction(DstFormat, TRUE);
int cll = shift - 1; /* -1 builds in the /2's */
UINT32 srcPad = srcStep - (width * 4);
UINT32 dstPad = dstStep - (width * formatSize);
for (y = 0; y < height; y++)
{
const BYTE* sptr = &pSrc[srcStep * y];
BYTE* dptr = &pDst[dstStep * y];
for (x = 0; x < width; x++)
{
/* Note: shifts must be done before sign-conversion. */
Cg = (INT16)((INT8)((*sptr++) << cll));
Co = (INT16)((INT8)((*sptr++) << cll));
Y = (INT16)(*sptr++); /* UINT8->INT16 */
A = *sptr++;
const INT16 Cg = convert(*sptr++, shift);
const INT16 Co = convert(*sptr++, shift);
const INT16 Y = *sptr++; /* UINT8->INT16 */
const INT16 T = Y - Cg;
const INT16 B = T + Co;
const INT16 G = Y + Cg;
const INT16 R = T - Co;
BYTE A = *sptr++;
if (!withAlpha)
A = 0xFFU;
T = Y - Cg;
B = T + Co;
G = Y + Cg;
R = T - Co;
dptr = writePixel(dptr, formatSize, DstFormat, CLIP(R), CLIP(G), CLIP(B), A);
}
sptr += srcPad;
dptr += dstPad;
}
return PRIMITIVES_SUCCESS;