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/* ======================================================================== */
/* NAME */
/* scale_v2 -- Vertical scaling down by 2 */
/*S S*/
/*S AUTHOR S*/
/*S J. Sankaran S*/
/*S S*/
/*S REVISION HISTORY S*/
/*S 03-Mar-2002 Initial revision of scale_v2 . . . . . J.Sankaran S*/
/* */
/* USAGE */
/* This routine has the following C prototype: */
/* */
/* void scale_v2 */
/* ( */
/* unsigned char *restrict inp, */
/* int pixs, */
/* int stride, */
/* int lns, */
/* unsigned char *restrict outp */
/* ) */
/* */
/* The scale_v2 routine accepts an array "inp" of "lns" lines each */
/* of "pixs" pixels seperated by "stride" bytes, and produces an */
/* output array "outp" of "lns >> 1" and "pixs" pixels. */
/* */
/* DESCRIPTION */
/* The scale_v2 algorithm performs vertical scaling by a factor of */
/* "2" by averaging succesive lines as opposed to mere pixel dropping. */
/* */
/* TECHNIQUES */
/* None */
/* */
/* ASSUMPTIONS */
/* 'lns' must be a multiple of 2, and can be greater than or equal */
/* to 2. The input and output pointers are double word aligned. The */
/* number of pixels to process is a multiple of eight, and the number */
/* of lines to process are two. Outer loop that iterated for the lines */
/* and the inner loop that iterated for the pixels are collpsed together */
/* to reduce pipe up pipe down overhead. */
/* */
/* NOTES */
/* */
/* SOURCE */
/* None */
/* */
/* INTERRUPT NOTE */
/* This code is interrupt tolerant but not interruptible. */
/* */
/* CYCLES: */
/* (3 * lns * pixs )/32 + 15 */
/* */
/* CODESIZE: */
/* 266 bytes */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
#ifndef _SCALE_V2_H_H
#define _SCALE_V2_H_H
void scale_v2_asm
(
unsigned char *restrict inp,
int pixs,
int stride,
int lns,
unsigned char *restrict outp
);
#endif /*_SCALE_V2_H_H*/
/* ======================================================================== */
/* End of file: scale_v2_h.h */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2000 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */