ples pred8x8L[ X, y ], with X, y = 0..7, are derived by 3x8L[x,y]=p[-1,y],with X, y = 0..7 (8-90) 8.3.2.2.4 Specification of Intra_8x8_DC prediction mode This Intra_8x8 prediction mode is invoked when Intra8x8PredMode[ luma8x8BlkIdx ] is equal to 2. The values of the prediction samples pred8x8L X, y ], with X, y=0..7, are derived as follows: If all samples p[x,-1], with X 0..7, and p[-1,y], with y=0..7, = are marked as "available for Intra_8x8 prediction," the values of the prediction samples pred8x8L[ X, y ], with X, y = 0..7, are derived by (8-91) Otherwise, if any samples p[x, -1], with X = 0..7, are marked as "not available for Intra 8x8 prediction" and all samples p[ (-1,y], with y=0..7, are marked as "available for Intra_8x8 prediction", the values of the prediction samples pred8x8L[ X, with X, y = 0..7, are derived by (8-92) Otherwise, if any samples p[-1, ], with y = 0..7, are marked as "not available for Intra_8x8 prediction" and all samples p[ -1], with x=0..7, are marked as "available for Intra_8x8 prediction", the values of the prediction samples pred8x8L[ y with X, y = 0..7, are derived by (8-93) Otherwise (some samples p[x, -1], with X = 0..7, and some samples p[ -1, y ], with y = 0..7, are marked as "not available for Intra_8x8 prediction"), the values of the prediction samples pred8x8L[ x, y ], with X, y = 0..7, are derived by [x,y]=(1<< ( BitDepthy - 1) ) (8-94) NOTE - An 8x8 luma block can always be predicted using this mode. 8.3.2.2.5 Specification of Intra_8x8_Diagonal_Down_Left prediction mode This Intra_8x8 prediction mode is invoked when Intra8x8PredMode[luma8x8BlkIdx ] is equal to 3. This mode shall be used only when the samples p[ X, -1] with X = 0..15 are marked as "available for Intra 8x8 prediction". The values of the prediction samples pred8x81[x,y] with X, y = 0..7, are derived as follows: If X is equal to 7 and y is equal to 7, pred8x8L[x,y]=(p[14,-1]+3*p[15,-1]+2)>>2 (8-95) Otherwise (x is not equal to 7 or y is not equal to 7), pred8x8L[x,y]=(p[x+y,-1]+2*p[x+y+1,-1]+p[x+y+2,-1]+2)