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Rewrite scale_line to use std::fill

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Eliminate inline byte-by-byte store.
This commit is contained in:
Kp 2014-12-05 03:29:33 +00:00
parent 241b3140fd
commit 0dfbe46318
1 changed files with 9 additions and 12 deletions
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21
common/2d/bitblt.cpp
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@ -37,6 +37,7 @@ COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
#endif
#include "compiler-array.h"
#include "compiler-exchange.h"
static int gr_bitblt_dest_step_shift = 0;
static ubyte *gr_bitblt_fade_table=NULL;
@ -447,23 +448,19 @@ static void gr_bm_ubitblt0x_rle(unsigned w, unsigned h, int dx, int dy, int sx,
// rescalling bitmaps, 10/14/99 Jan Bobrowski jb@wizard.ae.krakow.pl
static void scale_line(const uint8_t *in, uint8_t *out, unsigned ilen, unsigned olen)
static void scale_line(const uint8_t *in, uint8_t *out, const uint_fast32_t ilen, const uint_fast32_t olen)
{
int a = olen/ilen, b = olen%ilen;
int c = 0, i;
unsigned char *end = out + olen;
while(out<end) {
i = a;
uint_fast32_t a = olen / ilen, b = olen % ilen, c = 0;
for (uint8_t *const end = out + olen; out != end;)
{
uint_fast32_t i = a;
c += b;
if(c >= ilen) {
c -= ilen;
goto inside;
++i;
}
while(--i>=0) {
inside:
*out++ = *in;
}
in++;
auto e = out + i + 1;
std::fill(exchange(out, e), e, *in++);
}
}