dcl X + xO, y + yO ], with X, y = 0..3, are derived as: 0..3. (8-137) Otherwise (some samples p[ X + xO, -1], with X = 0..3, and some samples p[ -1, y +yO ], with y = 0..3, are marked as "not available for Intra chroma prediction"), the values of the prediction samples predcl + xO, y + yO with X, y = 0..3, are derived as: predcx+xO,y+yO]=(1<<(BitDepthc-1)),with X, y = 0..3. (8-138) Otherwise (xO is equal to 0 and yO is greater than 0), the values of the prediction samples predc[x y + yO ] with x, y = 0..3 are derived as follows: If all samples p[ -1, y +yO], with y = =0..3, are marked as "available for Intra chroma prediction", the values of the prediction samples predc[ xO, y + yO ], with X, y = 0..3, are derived as: y = 0..3. (8-139) Otherwise, if all samples p[x+x0,-1], with X = 0..3, are marked as "available for Intra chroma prediction", the values of the prediction samples predcl xO, y + yO ], with X, y = 0..3, are derived as: 0..3. (8-140) Otherwise (some samples p[ X + xO, -1], with X = 0..3, and some samples p[ -1, y +yO ], with y = 0..3, are marked as "not available for Intra chroma prediction"), the values of the prediction samples predcl + xO, y + yO ] with X, y = 0..3, are derived as: predc[x+xO,y+yO]=(1<<(BitDepthc-1)),withx, y = 0..3. (8-141) 8.3.4.2 Specification of Intra_Chroma_Horizontalprediction mode This Intra chroma prediction mode is invoked when intra_chroma_pred_modei is equal to 1. This mode shall be used only when the samples p[ -1, y ] with y = 0..MbHeightC - 1 are marked as "available for Intra chroma prediction". The values of the prediction samples predcl X, y ] are derived as: predc[ X, ,y]=p[-1,y], with X = 0..MbWidthC - 1 and y = 0..MbHeightC - (8-142) 8.3.4.3 Specification of Intra_Chroma_Vertical prediction mode This Intra chroma prediction mode is invoked when intra_chroma_pred_mode is equal to 2. This mode shall be used only when the samples p[ X, -1] with X = 0..MbWidthC - 1 are marked as "available for Intra chroma prediction". The values of the prediction samples predcl X, 