mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/gdv: Factor terms out of inner loops in rescale()
This also replaces some loops by memcpy() Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
parent
b90d8cc746
commit
a423970511
|
@ -83,44 +83,51 @@ static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, in
|
|||
if (gdv->scale_h && gdv->scale_v) {
|
||||
for (j = 0; j < h; j++) {
|
||||
int y = h - j - 1;
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
|
||||
uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>1) * (w>>1);
|
||||
for (i = 0; i < w; i++) {
|
||||
int x = w - i - 1;
|
||||
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + (x>>1) + (y>>1) * (w>>1)];
|
||||
dst1[x] = src1[(x>>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>>1) * w];
|
||||
}
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
|
||||
uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>1) * w;
|
||||
memcpy(dst1, src1, w);
|
||||
}
|
||||
} else if (gdv->scale_v) {
|
||||
for (j = 0; j < h; j++) {
|
||||
int y = h - j - 1;
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
|
||||
uint8_t *src1 = dst + PREAMBLE_SIZE + y * (w>>1);
|
||||
for (i = 0; i < w; i++) {
|
||||
int x = w - i - 1;
|
||||
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + (x>>1) + y * (w>>1)];
|
||||
dst1[x] = src1[(x>>1)];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (scale_h && scale_v) {
|
||||
for (y = 0; y < (h>>1); y++) {
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * (w>>1);
|
||||
uint8_t *src1 = dst + PREAMBLE_SIZE + y*2 * w;
|
||||
for (x = 0; x < (w>>1); x++) {
|
||||
dst[PREAMBLE_SIZE + x + y * (w>>1)] = dst[PREAMBLE_SIZE + x*2 + y*2 * w];
|
||||
dst1[x] = src1[x*2];
|
||||
}
|
||||
}
|
||||
} else if (scale_h) {
|
||||
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];
|
||||
}
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
|
||||
uint8_t *src1 = dst + PREAMBLE_SIZE + y*2 * w;
|
||||
memcpy(dst1, src1, w);
|
||||
}
|
||||
} else if (scale_v) {
|
||||
for (y = 0; y < h; y++) {
|
||||
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
|
||||
for (x = 0; x < (w>>1); x++) {
|
||||
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x*2 + y * w];
|
||||
dst1[x] = dst1[x*2];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue