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avcodec/pixlet: simplify lowpass_prediction() function

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-12-24 16:42:00 +01:00
parent c4152fc42e
commit 25c4035529
1 changed files with 7 additions and 10 deletions
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17
libavcodec/pixlet.c
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@ -343,21 +343,18 @@ static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame
static void lowpass_prediction(int16_t *dst, int16_t *pred, int width, int height, ptrdiff_t stride)
{
int16_t *next, val;
int16_t val;
int i, j;
memset(pred, 0, width * sizeof(*pred));
for (i = 0; i < height; i++) {
val = pred[0] + dst[0];
dst[0] = val;
pred[0] = val;
next = dst + 2;
for (j = 1; j < width; j++, next++) {
val = pred[j] + next[-1];
next[-1] = val;
pred[j] = val;
next[-1] += next[-2];
val = pred[0] + dst[0];
dst[0] = pred[0] = val;
for (j = 1; j < width; j++) {
val = pred[j] + dst[j];
dst[j] = pred[j] = val;
dst[j] += dst[j-1];
}
dst += stride;
}