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      1 /*
      2  * Copyright (C) 2007-2008 ARM Limited
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  *
     16  */
     17 /**
     18  *
     19  * File Name:  omxVCCOMM_ComputeTextureErrorBlock.c
     20  * OpenMAX DL: v1.0.2
     21  * Revision:   9641
     22  * Date:       Thursday, February 7, 2008
     23  *
     24  *
     25  *
     26  *
     27  * Description:
     28  * Contains module computing the error for a MB of size 8x8
     29  *
     30  */
     31 
     32 #include "omxtypes.h"
     33 #include "armOMX.h"
     34 #include "omxVC.h"
     35 #include "armCOMM.h"
     36 
     37 /**
     38  * Function:  omxVCCOMM_ComputeTextureErrorBlock   (6.1.4.1.2)
     39  *
     40  * Description:
     41  * Computes the texture error of the block.
     42  *
     43  * Input Arguments:
     44  *
     45  *   pSrc - pointer to the source plane. This should be aligned on an 8-byte
     46  *            boundary.
     47  *   srcStep - step of the source plane
     48  *   pSrcRef - pointer to the reference buffer, an 8x8 block. This should be
     49  *            aligned on an 8-byte boundary.
     50  *
     51  * Output Arguments:
     52  *
     53  *   pDst - pointer to the destination buffer, an 8x8 block. This should be
     54  *            aligned on an 8-byte boundary.
     55  *
     56  * Return Value:
     57  *
     58  *    OMX_Sts_NoErr - no error
     59  *    OMX_Sts_BadArgErr - bad arguments:
     60  *    -    At least one of the following pointers is NULL:
     61  *         pSrc, pSrcRef, pDst.
     62  *    -    pSrc is not 8-byte aligned.
     63  *    -    SrcStep <= 0 or srcStep is not a multiple of 8.
     64  *    -    pSrcRef is not 8-byte aligned.
     65  *    -    pDst is not 8-byte aligned
     66  *
     67  */
     68 
     69 OMXResult omxVCCOMM_ComputeTextureErrorBlock(
     70      const OMX_U8 *pSrc,
     71      OMX_INT srcStep,
     72      const OMX_U8 *pSrcRef,
     73      OMX_S16 * pDst
     74 )
     75 {
     76 
     77     OMX_INT     x, y, count;
     78 
     79     /* Argument error checks */
     80     armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr);
     81     armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr);
     82     armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
     83     armRetArgErrIf(!armIs8ByteAligned(pSrc), OMX_Sts_BadArgErr);
     84     armRetArgErrIf(!armIs8ByteAligned(pSrcRef), OMX_Sts_BadArgErr);
     85     armRetArgErrIf(!armIs8ByteAligned(pDst), OMX_Sts_BadArgErr);
     86     armRetArgErrIf((srcStep <= 0) || (srcStep & 7), OMX_Sts_BadArgErr);
     87 
     88     /* Calculate the error block */
     89     for (y = 0, count = 0;
     90          y < 8;
     91          y++, pSrc += srcStep)
     92     {
     93         for (x = 0; x < 8; x++, count++)
     94         {
     95             pDst[count] = pSrc[x] - pSrcRef[count];
     96         }
     97     }
     98 
     99     return OMX_Sts_NoErr;
    100 
    101 }
    102 
    103 /* End of file */
    104