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|
;//
;//
;// File Name: omxVCCOMM_ExpandFrame_I_s.s
;// OpenMAX DL: v1.0.2
;// Revision: 9641
;// Date: Thursday, February 7, 2008
;//
;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
;//
;//
;//
;// Description:
;// This function will Expand Frame boundary pixels into Plane
;//
;//
;// Include standard headers
INCLUDE omxtypes_s.h
INCLUDE armCOMM_s.h
M_VARIANTS ARM1136JS
;// Import symbols required from other files
;// (For example tables)
;// Set debugging level
DEBUG_ON SETL {FALSE}
;// Guarding implementation by the processor name
IF ARM1136JS
;//Input Registers
pSrcDstPlane RN 0
iFrameWidth RN 1
iFrameHeight RN 2
iExpandPels RN 3
;//Output Registers
result RN 0
;//Local Scratch Registers
iPlaneStep RN 4
pTop RN 5
pBottom RN 6
pBottomIndex RN 7
x RN 8
y RN 9
tempTop RN 10
tempBot RN 11
ColStep RN 12
pLeft RN 5
pRight RN 6
pRightIndex RN 7
tempLeft1 RN 10
tempRight1 RN 11
tempLeft2 RN 14
tempRight2 RN 2
indexY RN 14
RowStep RN 12
expandTo4bytes RN 1 ;// copy a byte to 4 bytes of a word
;// Allocate stack memory required by the function
;// Write function header
M_START omxVCCOMM_ExpandFrame_I,r11
;// Define stack arguments
M_ARG iPlaneStepOnStack, 4
;// Load argument from the stack
M_LDR iPlaneStep, iPlaneStepOnStack
MUL pTop,iExpandPels,iPlaneStep
MLA pBottom,iFrameHeight,iPlaneStep,pSrcDstPlane
SUB x,iFrameWidth,#4
MOV indexY,pTop
ADD ColStep,indexY,#4
SUB pBottomIndex,pBottom,iPlaneStep
SUB pTop,pSrcDstPlane,pTop
ADD pTop,pTop,x
ADD pBottom,pBottom,x
;//------------------------------------------------------------------------
;// The following improves upon the C implmentation
;// The x and y loops are interchanged: This ensures that the values of
;// pSrcDstPlane [x] and pSrcDstPlane [(iFrameHeight - 1) * iPlaneStep + x]
;// which depend only on loop variable 'x' are loaded once and used in
;// multiple stores in the 'Y' loop
;//------------------------------------------------------------------------
;// xloop
ExpandFrameTopBotXloop
LDR tempTop,[pSrcDstPlane,x]
;//------------------------------------------------------------------------
;// pSrcDstPlane [(iFrameHeight - 1) * iPlaneStep + x] is simplified as:
;// pSrcDstPlane + (iFrameHeight * iPlaneStep) - iPlaneStep + x ==
;// pBottom - iPlaneStep + x == pBottomIndex [x]
;// The value of pBottomIndex is calculated above this 'x' loop
;//------------------------------------------------------------------------
LDR tempBot,[pBottomIndex,x]
;// yloop
MOV y,iExpandPels
ExpandFrameTopBotYloop
SUBS y,y,#1
M_STR tempTop,[pTop],iPlaneStep
M_STR tempBot,[pBottom],iPlaneStep
BGT ExpandFrameTopBotYloop
SUBS x,x,#4
SUB pTop,pTop,ColStep
SUB pBottom,pBottom,ColStep
BGE ExpandFrameTopBotXloop
;// y loop
;// The product is already calculated above : Reuse
;//MUL indexY,iExpandPels,iPlaneStep
SUB pSrcDstPlane,pSrcDstPlane,indexY
SUB pLeft,pSrcDstPlane,iExpandPels ;// pLeft->points to the top left of the expanded block
ADD pRight,pSrcDstPlane,iFrameWidth
SUB pRightIndex,pRight,#1
ADD y,iFrameHeight,iExpandPels,LSL #1
LDR expandTo4bytes,=0x01010101
RSB RowStep,iExpandPels,iPlaneStep,LSL #1
;// The Y Loop is unrolled twice
ExpandFrameLeftRightYloop
LDRB tempLeft2,[pSrcDstPlane,iPlaneStep] ;// PreLoad the values
LDRB tempRight2,[pRightIndex,iPlaneStep]
M_LDRB tempLeft1,[pSrcDstPlane],iPlaneStep,LSL #1 ;// PreLoad the values
M_LDRB tempRight1,[pRightIndex],iPlaneStep,LSL #1
SUB x,iExpandPels,#4
MUL tempLeft2,tempLeft2,expandTo4bytes ;// Copy the single byte to 4 bytes
MUL tempRight2,tempRight2,expandTo4bytes
MUL tempLeft1,tempLeft1,expandTo4bytes ;// Copy the single byte to 4 bytes
MUL tempRight1,tempRight1,expandTo4bytes
;// x loop
ExpandFrameLeftRightXloop
SUBS x,x,#4
STR tempLeft2,[pLeft,iPlaneStep] ;// Store the 4 bytes at one go
STR tempRight2,[pRight,iPlaneStep]
STR tempLeft1,[pLeft],#4 ;// Store the 4 bytes at one go
STR tempRight1,[pRight],#4
BGE ExpandFrameLeftRightXloop
SUBS y,y,#2
ADD pLeft,pLeft,RowStep
ADD pRight,pRight,RowStep
BGT ExpandFrameLeftRightYloop
;// Set return value
MOV result,#OMX_Sts_NoErr
End
;// Write function tail
M_END
ENDIF ;//ARM1136JS
END
|
