1 ;// 2 ;// 3 ;// File Name: omxVCCOMM_ExpandFrame_I_s.s 4 ;// OpenMAX DL: v1.0.2 5 ;// Revision: 9641 6 ;// Date: Thursday, February 7, 2008 7 ;// 8 ;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 9 ;// 10 ;// 11 ;// 12 ;// Description: 13 ;// This function will Expand Frame boundary pixels into Plane 14 ;// 15 ;// 16 17 ;// Include standard headers 18 19 INCLUDE omxtypes_s.h 20 INCLUDE armCOMM_s.h 21 22 M_VARIANTS ARM1136JS 23 24 ;// Import symbols required from other files 25 ;// (For example tables) 26 27 28 ;// Set debugging level 29 DEBUG_ON SETL {FALSE} 30 31 32 33 34 35 36 37 ;// Guarding implementation by the processor name 38 39 IF ARM1136JS 40 41 ;//Input Registers 42 43 pSrcDstPlane RN 0 44 iFrameWidth RN 1 45 iFrameHeight RN 2 46 iExpandPels RN 3 47 48 49 ;//Output Registers 50 51 result RN 0 52 53 ;//Local Scratch Registers 54 55 iPlaneStep RN 4 56 pTop RN 5 57 pBottom RN 6 58 pBottomIndex RN 7 59 x RN 8 60 y RN 9 61 tempTop RN 10 62 tempBot RN 11 63 ColStep RN 12 64 pLeft RN 5 65 pRight RN 6 66 pRightIndex RN 7 67 tempLeft1 RN 10 68 tempRight1 RN 11 69 tempLeft2 RN 14 70 tempRight2 RN 2 71 indexY RN 14 72 RowStep RN 12 73 expandTo4bytes RN 1 ;// copy a byte to 4 bytes of a word 74 75 ;// Allocate stack memory required by the function 76 77 78 ;// Write function header 79 M_START omxVCCOMM_ExpandFrame_I,r11 80 81 ;// Define stack arguments 82 M_ARG iPlaneStepOnStack, 4 83 84 ;// Load argument from the stack 85 M_LDR iPlaneStep, iPlaneStepOnStack 86 87 MUL pTop,iExpandPels,iPlaneStep 88 MLA pBottom,iFrameHeight,iPlaneStep,pSrcDstPlane 89 SUB x,iFrameWidth,#4 90 MOV indexY,pTop 91 ADD ColStep,indexY,#4 92 SUB pBottomIndex,pBottom,iPlaneStep 93 SUB pTop,pSrcDstPlane,pTop 94 95 96 ADD pTop,pTop,x 97 ADD pBottom,pBottom,x 98 99 ;//------------------------------------------------------------------------ 100 ;// The following improves upon the C implmentation 101 ;// The x and y loops are interchanged: This ensures that the values of 102 ;// pSrcDstPlane [x] and pSrcDstPlane [(iFrameHeight - 1) * iPlaneStep + x] 103 ;// which depend only on loop variable 'x' are loaded once and used in 104 ;// multiple stores in the 'Y' loop 105 ;//------------------------------------------------------------------------ 106 107 ;// xloop 108 ExpandFrameTopBotXloop 109 110 LDR tempTop,[pSrcDstPlane,x] 111 ;//------------------------------------------------------------------------ 112 ;// pSrcDstPlane [(iFrameHeight - 1) * iPlaneStep + x] is simplified as: 113 ;// pSrcDstPlane + (iFrameHeight * iPlaneStep) - iPlaneStep + x == 114 ;// pBottom - iPlaneStep + x == pBottomIndex [x] 115 ;// The value of pBottomIndex is calculated above this 'x' loop 116 ;//------------------------------------------------------------------------ 117 LDR tempBot,[pBottomIndex,x] 118 119 ;// yloop 120 MOV y,iExpandPels 121 122 ExpandFrameTopBotYloop 123 SUBS y,y,#1 124 M_STR tempTop,[pTop],iPlaneStep 125 M_STR tempBot,[pBottom],iPlaneStep 126 BGT ExpandFrameTopBotYloop 127 128 SUBS x,x,#4 129 SUB pTop,pTop,ColStep 130 SUB pBottom,pBottom,ColStep 131 BGE ExpandFrameTopBotXloop 132 133 134 ;// y loop 135 ;// The product is already calculated above : Reuse 136 ;//MUL indexY,iExpandPels,iPlaneStep 137 138 SUB pSrcDstPlane,pSrcDstPlane,indexY 139 SUB pLeft,pSrcDstPlane,iExpandPels ;// pLeft->points to the top left of the expanded block 140 ADD pRight,pSrcDstPlane,iFrameWidth 141 SUB pRightIndex,pRight,#1 142 143 ADD y,iFrameHeight,iExpandPels,LSL #1 144 LDR expandTo4bytes,=0x01010101 145 146 RSB RowStep,iExpandPels,iPlaneStep,LSL #1 147 148 ;// The Y Loop is unrolled twice 149 ExpandFrameLeftRightYloop 150 LDRB tempLeft2,[pSrcDstPlane,iPlaneStep] ;// PreLoad the values 151 LDRB tempRight2,[pRightIndex,iPlaneStep] 152 M_LDRB tempLeft1,[pSrcDstPlane],iPlaneStep,LSL #1 ;// PreLoad the values 153 M_LDRB tempRight1,[pRightIndex],iPlaneStep,LSL #1 154 155 SUB x,iExpandPels,#4 156 MUL tempLeft2,tempLeft2,expandTo4bytes ;// Copy the single byte to 4 bytes 157 MUL tempRight2,tempRight2,expandTo4bytes 158 MUL tempLeft1,tempLeft1,expandTo4bytes ;// Copy the single byte to 4 bytes 159 MUL tempRight1,tempRight1,expandTo4bytes 160 161 162 ;// x loop 163 ExpandFrameLeftRightXloop 164 SUBS x,x,#4 165 STR tempLeft2,[pLeft,iPlaneStep] ;// Store the 4 bytes at one go 166 STR tempRight2,[pRight,iPlaneStep] 167 STR tempLeft1,[pLeft],#4 ;// Store the 4 bytes at one go 168 STR tempRight1,[pRight],#4 169 BGE ExpandFrameLeftRightXloop 170 171 SUBS y,y,#2 172 ADD pLeft,pLeft,RowStep 173 ADD pRight,pRight,RowStep 174 BGT ExpandFrameLeftRightYloop 175 176 177 ;// Set return value 178 179 MOV result,#OMX_Sts_NoErr 180 End 181 182 ;// Write function tail 183 184 M_END 185 186 ENDIF ;//ARM1136JS 187 188 189 END
