FreeRDP/libfreerdp/primitives/prim_YCoCg.c

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/* FreeRDP: A Remote Desktop Protocol Client
* YCoCg<->RGB Color conversion operations.
* vi:ts=4 sw=4:
*
* (c) Copyright 2014 Hewlett-Packard Development Company, L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <freerdp/types.h>
#include <freerdp/primitives.h>
#include "prim_internal.h"
/* ------------------------------------------------------------------------- */
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)
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{
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BYTE A;
UINT32 x, y;
BYTE* dptr = pDst;
const BYTE* sptr = pSrc;
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INT16 Cg, Co, Y, T, R, G, B;
const DWORD formatSize = GetBytesPerPixel(DstFormat);
fkt_writePixel writePixel = getPixelWriteFunction(DstFormat);
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int cll = shift - 1; /* -1 builds in the /2's */
UINT32 srcPad = srcStep - (width * 4);
UINT32 dstPad = dstStep - (width * formatSize);
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for (y = 0; y < height; y++)
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{
for (x = 0; x < width; x++)
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{
/* 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++;
if (!withAlpha)
A = 0xFFU;
T = Y - Cg;
R = T + Co;
G = Y + Cg;
B = T - Co;
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dptr = (*writePixel)(dptr, formatSize, DstFormat, CLIP(R),
CLIP(G), CLIP(B), A);
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}
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sptr += srcPad;
dptr += dstPad;
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}
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return PRIMITIVES_SUCCESS;
}
/* ------------------------------------------------------------------------- */
void primitives_init_YCoCg(primitives_t* prims)
{
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prims->YCoCgToRGB_8u_AC4R = general_YCoCgToRGB_8u_AC4R;
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}