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avcodec/gdv: Replace divisions by shifts in rescale() 

Divisions tend to be slower than shifts unless the compiler optimizes them out.
And some of these are in inner loops.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-05 16:13:24 +02:00
parent 303439bc5f
commit b90d8cc746
1 changed files with 8 additions and 8 deletions
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16
libavcodec/gdv.c
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@ -85,14 +85,14 @@ static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, in
int y = h - j - 1;
for (i = 0; i < w; i++) {
int x = w - i - 1;
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x/2 + (y/2) * (w/2)];
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + (x>>1) + (y>>1) * (w>>1)];
}
}
} else if (gdv->scale_h) {
for (j = 0; j < h; j++) {
int y = h - j - 1;
for (x = 0; x < w; x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x + (y/2) * w];
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x + (y>>1) * w];
}
}
} else if (gdv->scale_v) {
@ -100,26 +100,26 @@ static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, in
int y = h - j - 1;
for (i = 0; i < w; i++) {
int x = w - i - 1;
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x/2 + y * (w/2)];
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + (x>>1) + y * (w>>1)];
}
}
}
if (scale_h && scale_v) {
for (y = 0; y < h/2; y++) {
for (x = 0; x < w/2; x++) {
dst[PREAMBLE_SIZE + x + y * (w/2)] = dst[PREAMBLE_SIZE + x*2 + y*2 * w];
for (y = 0; y < (h>>1); y++) {
for (x = 0; x < (w>>1); x++) {
dst[PREAMBLE_SIZE + x + y * (w>>1)] = dst[PREAMBLE_SIZE + x*2 + y*2 * w];
}
}
} else if (scale_h) {
for (y = 0; y < h/2; y++) {
for (y = 0; y < (h>>1); y++) {
for (x = 0; x < w; x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x + y*2 * w];
}
}
} else if (scale_v) {
for (y = 0; y < h; y++) {
for (x = 0; x < w/2; x++) {
for (x = 0; x < (w>>1); x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x*2 + y * w];
}
}