mirror of https://github.com/FreeRDP/FreeRDP
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* FreeRDP: A Remote Desktop Protocol Client
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* YCoCg<->RGB Color conversion operations.
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* vi:ts=4 sw=4:
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*
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* (c) Copyright 2014 Hewlett-Packard Development Company, L.P.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <freerdp/config.h>
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#include <freerdp/types.h>
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#include <freerdp/primitives.h>
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#include "prim_internal.h"
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#include "prim_YCoCg.h"
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/* helper function to convert raw 8 bit values to signed 16bit values.
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*/
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static INT16 convert(UINT8 raw, int shift)
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{
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const int cll = shift - 1; /* -1 builds in the /2's */
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return (INT16)((INT8)(raw << cll));
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}
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/* ------------------------------------------------------------------------- */
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static pstatus_t general_YCoCgToRGB_8u_AC4R(const BYTE* pSrc, INT32 srcStep, BYTE* pDst,
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UINT32 DstFormat, INT32 dstStep, UINT32 width,
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UINT32 height, UINT8 shift, BOOL withAlpha)
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{
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const DWORD formatSize = FreeRDPGetBytesPerPixel(DstFormat);
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fkt_writePixel writePixel = getPixelWriteFunction(DstFormat, TRUE);
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for (size_t y = 0; y < height; y++)
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{
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const BYTE* sptr = &pSrc[y * srcStep];
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BYTE* dptr = &pDst[y * dstStep];
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for (size_t x = 0; x < width; x++)
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{
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/* Note: shifts must be done before sign-conversion. */
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const INT16 Cg = convert(*sptr++, shift);
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const INT16 Co = convert(*sptr++, shift);
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const INT16 Y = *sptr++; /* UINT8->INT16 */
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const INT16 T = Y - Cg;
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const INT16 B = T + Co;
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const INT16 G = Y + Cg;
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const INT16 R = T - Co;
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BYTE A = *sptr++;
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if (!withAlpha)
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A = 0xFFU;
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dptr = writePixel(dptr, formatSize, DstFormat, CLIP(R), CLIP(G), CLIP(B), A);
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}
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}
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return PRIMITIVES_SUCCESS;
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}
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/* ------------------------------------------------------------------------- */
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void primitives_init_YCoCg(primitives_t* WINPR_RESTRICT prims)
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{
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prims->YCoCgToRGB_8u_AC4R = general_YCoCgToRGB_8u_AC4R;
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}
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void primitives_init_YCoCg_opt(primitives_t* WINPR_RESTRICT prims)
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{
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primitives_init_YCoCg_ssse3(prims);
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primitives_init_YCoCg_neon(prims);
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}
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