CWE-ou-minkata/Sources/Plasma/FeatureLib/pfMoviePlayer/plPlanarImage.cpp

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
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*==LICENSE==*/

#include "plPlanarImage.h"

///////////////////////////////////////////////////////////////////////////////

static UInt8 Clip(Int32 val) {
    if (val < 0) {
        return 0;
    } else if (val > 255) {
        return 255;
    }
    return static_cast<UInt8>(val);
}

#define YG 74 /* static_cast<int8>(1.164 * 64 + 0.5) */

#define UB 127 /* min(63,static_cast<int8>(2.018 * 64)) */
#define UG -25 /* static_cast<int8>(-0.391 * 64 - 0.5) */
#define UR 0

#define VB 0
#define VG -52 /* static_cast<int8>(-0.813 * 64 - 0.5) */
#define VR 102 /* static_cast<int8>(1.596 * 64 + 0.5) */

// Bias
#define BB UB * 128 + VB * 128
#define BG UG * 128 + VG * 128
#define BR UR * 128 + VR * 128

void plPlanarImage::Yuv420ToRgba(UInt32 w, UInt32 h, const Int32* stride, UInt8** planes, UInt8* const dest)
{
    const UInt8* y_src = planes[0];
    const UInt8* u_src = planes[1];
    const UInt8* v_src = planes[2];

    for (UInt32 i = 0; i < h; ++i)
    {
        for (UInt32 j = 0; j < w; ++j)
        {
            size_t y_idx = stride[0] * i + j;
            size_t u_idx = stride[1] * (i/2) + (j/2);
            size_t v_idx = stride[2] * (i/2) + (j/2);
            size_t dest_idx = w * i + j;

            Int32 y = static_cast<Int32>(y_src[y_idx]);
            Int32 u = static_cast<Int32>(u_src[u_idx]);
            Int32 v = static_cast<Int32>(v_src[v_idx]);
            Int32 y1 = (y - 16) * YG;

            dest[dest_idx*4+0] = Clip(((u * UB + v * VB) - (BB) + y1) >> 6);
            dest[dest_idx*4+1] = Clip(((u * UG + v * VG) - (BG) + y1) >> 6);
            dest[dest_idx*4+2] = Clip(((u * UR + v * VR) - (BR) + y1) >> 6);
            dest[dest_idx*4+3] = 0xff;
        }
    }
}