FreeRDP/libfreerdp/primitives/prim_YCoCg.c
2016-12-01 15:36:49 +01:00

86 lines
2.4 KiB
C

/* 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"
#ifndef MINMAX
#define MINMAX(_v_, _l_, _h_) \
((_v_) < (_l_) ? (_l_) : ((_v_) > (_h_) ? (_h_) : (_v_)))
#endif /* !MINMAX */
/* ------------------------------------------------------------------------- */
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);
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++)
{
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++;
if (!withAlpha)
A = 0xFFU;
T = Y - Cg;
R = T + Co;
G = Y + Cg;
B = T - Co;
dptr = (*writePixel)(dptr, formatSize, DstFormat, MINMAX(R, 0, 255),
MINMAX(G, 0, 255), MINMAX(B, 0, 255), A);
}
sptr += srcPad;
dptr += dstPad;
}
return PRIMITIVES_SUCCESS;
}
/* ------------------------------------------------------------------------- */
void primitives_init_YCoCg(primitives_t* prims)
{
prims->YCoCgToRGB_8u_AC4R = general_YCoCgToRGB_8u_AC4R;
}