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/* FreeRDP: A Remote Desktop Protocol Client
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* Color conversion operations.
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* Copyright 2011 Stephen Erisman
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* Copyright 2011 Norbert Federa <nfedera@thinstuff.com>
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* Copyright 2011 Martin Fleisz <mfleisz@thinstuff.com>
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* (c) Copyright 2012 Hewlett-Packard Development Company, L.P.
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License. You may obtain
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* a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
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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
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* or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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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_colors.h"
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#define MINMAX(_v_, _l_, _h_) \
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((_v_) < (_l_) ? (_l_) : ((_v_) > (_h_) ? (_h_) : (_v_)))
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/* ------------------------------------------------------------------------- */
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pstatus_t general_yCbCrToRGB_16s16s_P3P3(
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const INT16 *pSrc[3], INT32 srcStep,
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INT16 *pDst[3], INT32 dstStep,
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const prim_size_t *roi) /* region of interest */
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* The decoded YCbCr coeffectients are represented as 11.5 fixed-point
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* 1 sign bit + 10 integer bits + 5 fractional bits
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* However only 7 integer bits will be actually used since the value range
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* is [-128.0, 127.0]. In other words, the decoded coefficients are scaled
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* by << 5 when interpreted as INT16.
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* It was scaled in the quantization phase, so we must scale it back here.
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const INT16 *yptr = pSrc[0];
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const INT16 *cbptr = pSrc[1];
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const INT16 *crptr = pSrc[2];
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INT16 *rptr = pDst[0];
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INT16 *gptr = pDst[1];
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INT16 *bptr = pDst[2];
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int srcbump = (srcStep - (roi->width * sizeof(UINT16))) / sizeof(UINT16);
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int dstbump = (dstStep - (roi->width * sizeof(UINT16))) / sizeof(UINT16);
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for (y=0; y<roi->height; y++)
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for (x=0; x<roi->width; ++x)
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/* INT32 is used intentionally because we calculate
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* with shifted factors!
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INT32 y = (INT32) (*yptr++);
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INT32 cb = (INT32) (*cbptr++);
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INT32 cr = (INT32) (*crptr++);
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* This is the slow floating point version kept here for reference.
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* y = y + 4096; // 128<<5=4096 so that we can scale the sum by>>5
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* g = y - cb*0.344f - cr*0.714f;
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* y_r_buf[i] = MINMAX(r>>5, 0, 255);
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* cb_g_buf[i] = MINMAX(g>>5, 0, 255);
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* cr_b_buf[i] = MINMAX(b>>5, 0, 255);
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* We scale the factors by << 16 into 32-bit integers in order to
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* avoid slower floating point multiplications. Since the final
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* result needs to be scaled by >> 5 we will extract only the
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* upper 11 bits (>> 21) from the final sum.
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* Hence we also have to scale the other terms of the sum by << 16.
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* R: 1.403 << 16 = 91947
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* G: 0.344 << 16 = 22544, 0.714 << 16 = 46792
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* B: 1.770 << 16 = 115998
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g = y - cb*22544 - cr*46792;
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*rptr++ = MINMAX(r>>21, 0, 255);
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*gptr++ = MINMAX(g>>21, 0, 255);
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*bptr++ = MINMAX(b>>21, 0, 255);
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return PRIMITIVES_SUCCESS;
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/* ------------------------------------------------------------------------- */
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pstatus_t general_RGBToYCbCr_16s16s_P3P3(
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const INT16 *pSrc[3], INT32 srcStep,
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INT16 *pDst[3], INT32 dstStep,
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const prim_size_t *roi) /* region of interest */
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/* The encoded YCbCr coefficients are represented as 11.5 fixed-point
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* 1 sign bit + 10 integer bits + 5 fractional bits
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* However only 7 integer bits will be actually used since the value
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* range is [-128.0, 127.0]. In other words, the encoded coefficients
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* is scaled by << 5 when interpreted as INT16.
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* It will be scaled down to original during the quantization phase.
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const INT16 *rptr = pSrc[0];
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const INT16 *gptr = pSrc[1];
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const INT16 *bptr = pSrc[2];
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INT16 *yptr = pDst[0];
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INT16 *cbptr = pDst[1];
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INT16 *crptr = pDst[2];
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int srcbump = (srcStep - (roi->width * sizeof(UINT16))) / sizeof(UINT16);
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int dstbump = (dstStep - (roi->width * sizeof(UINT16))) / sizeof(UINT16);
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for (y=0; y<roi->height; y++)
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for (x=0; x<roi->width; ++x)
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/* INT32 is used intentionally because we calculate with
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INT32 r = (INT32) (*rptr++);
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INT32 g = (INT32) (*gptr++);
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INT32 b = (INT32) (*bptr++);
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/* We scale the factors by << 15 into 32-bit integers in order
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* to avoid slower floating point multiplications. Since the
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* terms need to be scaled by << 5 we simply scale the final
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* Y: 0.299000 << 15 = 9798, 0.587000 << 15 = 19235,
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* 0.114000 << 15 = 3735
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* Cb: 0.168935 << 15 = 5535, 0.331665 << 15 = 10868,
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* 0.500590 << 15 = 16403
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* Cr: 0.499813 << 15 = 16377, 0.418531 << 15 = 13714,
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* 0.081282 << 15 = 2663
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INT32 y = (r * 9798 + g * 19235 + b * 3735) >> 10;
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INT32 cb = (r * -5535 + g * -10868 + b * 16403) >> 10;
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INT32 cr = (r * 16377 + g * -13714 + b * -2663) >> 10;
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*yptr++ = (INT16) MINMAX(y - 4096, -4096, 4095);
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*cbptr++ = (INT16) MINMAX(cb, -4096, 4095);
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*crptr++ = (INT16) MINMAX(cr, -4096, 4095);
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return PRIMITIVES_SUCCESS;
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/* ------------------------------------------------------------------------- */
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pstatus_t general_RGBToRGB_16s8u_P3AC4R(
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const INT16 *pSrc[3], /* 16-bit R,G, and B arrays */
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int srcStep, /* bytes between rows in source data */
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BYTE *pDst, /* 32-bit interleaved ARGB (ABGR?) data */
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int dstStep, /* bytes between rows in dest data */
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const prim_size_t *roi) /* region of interest */
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const INT16 *r = pSrc[0];
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const INT16 *g = pSrc[1];
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const INT16 *b = pSrc[2];
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int srcbump = (srcStep - (roi->width * sizeof(UINT16))) / sizeof(UINT16);
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int dstbump = (dstStep - (roi->width * sizeof(UINT32)));
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for (y=0; y<roi->height; ++y)
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for (x=0; x<roi->width; ++x)
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*dst++ = (BYTE) (*b++);
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*dst++ = (BYTE) (*g++);
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*dst++ = (BYTE) (*r++);
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*dst++ = ((BYTE) (0xFFU));
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return PRIMITIVES_SUCCESS;
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/* ------------------------------------------------------------------------- */
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void primitives_init_colors(primitives_t* prims)
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prims->RGBToRGB_16s8u_P3AC4R = general_RGBToRGB_16s8u_P3AC4R;
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prims->yCbCrToRGB_16s16s_P3P3 = general_yCbCrToRGB_16s16s_P3P3;
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prims->RGBToYCbCr_16s16s_P3P3 = general_RGBToYCbCr_16s16s_P3P3;
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primitives_init_colors_opt(prims);
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/* ------------------------------------------------------------------------- */
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void primitives_deinit_colors(primitives_t* prims)