1 | The values of the prediction samples predSamples[ x, y ], with x, y = 0..nS-1 are derived by the following procedures. |
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2 | - If intraPredOrder is less than 18 |
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3 | - The reference pixel array refMain[ z ], with z=-nS..2*nS is specified as follows. |
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4 | refMain[ z ] = p[ -1+z, -1 ], with z=0..nS (8-36) |
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5 | - If intraPredAngle is less than 0, |
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6 | refMain[ z ] = p[ -1, -1+( ( z*invAngle+128 )>>8 ) ], with z=( nS*intraPredAngle ) >>5..-1 (8-37) |
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7 | - Otherwise, |
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8 | refMain[ z ] = p[ -1+z, -1 ], with z=nS+1..2*nS (8-38) |
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9 | - The index variable iIdx and the multiplication factor iFact are derived by |
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10 | iIdx = ( ( y + 1 )*intraPredAngle ) >> 5 (8-39) |
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11 | iFact = ( ( y + 1 )*intraPredAngle ) && 31 (8-40) |
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12 | - Depending on the value of iFact, the following applies. |
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13 | - If iFact is not equal to 0, the value of the prediction samples predSamples[ x, y ] is derived by |
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14 | predSamples[ x, y ] = ( ( 32 - iFact )*refMain[ x+iIdx+1 ] + iFact*refMain[ x+iIdx+2] + 16 ) >> 5 (8-41) |
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15 | - Otherwise, the value of the prediction samples predSamples[ x, y ] is derived by |
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16 | predSamples[ x, y ] = refMain[ x+iIdx+1 ] (8-42) |
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17 | - Otherwise |
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18 | - The reference pixel array refMain[ z ], with z=-nS..2*nS is specified as follows. |
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19 | refMain[ z ] = p[ -1, -1+z ], with z=0..nS (8-43) |
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20 | - If intraPredAngle is less than 0, |
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21 | refMain[ z ] = p[ -1+( ( z*invAngle+128 )>>8 ), -1 ], with z=( nS*intraPredAngle ) >>5..-1 (8-44) |
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22 | - Otherwise, |
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23 | refMain[ z ] = p[ -1, -1+z ], with z=nS+1..2*nS (8-45) |
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24 | - The index variable iIdx and the multiplication factor iFact are derived by |
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25 | iIdx = ( ( x + 1 )*intraPredAngle ) >> 5 (8-46) |
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26 | iFact = ( ( x + 1 )*intraPredAngle ) && 31 (8-47) |
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27 | - Depending on the value of iFact, the following applies. |
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28 | - If iFact is not equal to 0, the value of the prediction samples predSamples[ x, y ] is derived by |
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29 | predSamples[ x, y ] = ( ( 32 - iFact )*refMain[ y+iIdx+1 ] + iFact*refMain[ y+iIdx+2] + 16 ) >> 5 (8-48) |
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30 | - Otherwise, the value of the prediction samples predSamples[ x, y ] is derived by |
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31 | predSamples[ x, y ] = refMain[ y+iIdx+1 ] (8-49) |
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32 | |
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