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mss12: merge decode_pixel() and decode_top_left_pixel()

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No meaningful generated code differences using gcc -O3.

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
This commit is contained in:
Alberto Delmás 2012-08-31 11:24:26 +02:00 committed by Kostya Shishkov
parent 626c1a33ed
commit 344fbc47c7
1 changed files with 20 additions and 41 deletions
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61
libavcodec/mss12.c
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@ -154,50 +154,29 @@ static av_cold void pixctx_init(PixContext *ctx, int cache_size,
i ? THRESH_LOW : THRESH_ADAPTIVE);
}
static int decode_top_left_pixel(ArithCoder *acoder, PixContext *pctx)
static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
uint8_t *ngb, int num_ngb, int any_ngb)
{
int i, val, pix;
val = acoder->get_model_sym(acoder, &pctx->cache_model);
if (val < pctx->num_syms) {
pix = pctx->cache[val];
} else {
pix = acoder->get_model_sym(acoder, &pctx->full_model);
for (i = 0; i < pctx->cache_size - 1; i++)
if (pctx->cache[i] == pix)
break;
val = i;
}
if (val) {
for (i = val; i > 0; i--)
pctx->cache[i] = pctx->cache[i - 1];
pctx->cache[0] = pix;
}
if (any_ngb) {
int idx, j;
return pix;
}
static int decode_pixel(ArithCoder *acoder, PixContext *pctx,
uint8_t *ngb, int num_ngb)
{
int i, val, pix;
val = acoder->get_model_sym(acoder, &pctx->cache_model);
if (val < pctx->num_syms) {
int idx, j;
idx = 0;
for (i = 0; i < pctx->cache_size; i++) {
for (j = 0; j < num_ngb; j++)
if (pctx->cache[i] == ngb[j])
break;
if (j == num_ngb) {
if (idx == val)
break;
idx++;
idx = 0;
for (i = 0; i < pctx->cache_size; i++) {
for (j = 0; j < num_ngb; j++)
if (pctx->cache[i] == ngb[j])
break;
if (j == num_ngb) {
if (idx == val)
break;
idx++;
}
}
val = FFMIN(i, pctx->cache_size - 1);
}
val = FFMIN(i, pctx->cache_size - 1);
pix = pctx->cache[val];
} else {
pix = acoder->get_model_sym(acoder, &pctx->full_model);
@ -305,7 +284,7 @@ static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
if (pix < nlen)
return ref_pix[pix];
else
return decode_pixel(acoder, pctx, ref_pix, nlen);
return decode_pixel(acoder, pctx, ref_pix, nlen, 1);
}
static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic,
@ -320,7 +299,7 @@ static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic,
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) {
if (!i && !j)
p = decode_top_left_pixel(acoder, pctx);
p = decode_pixel(acoder, pctx, NULL, 0, 0);
else
p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
i, j, width - i - 1);
@ -412,7 +391,7 @@ static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder,
return -1;
} else if (mask[i] != 0x80) {
if (!i && !j)
p = decode_top_left_pixel(acoder, pctx);
p = decode_pixel(acoder, pctx, NULL, 0, 0);
else
p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
i, j, width - i - 1);
@ -490,7 +469,7 @@ static int decode_region_intra(SliceContext *sc, ArithCoder *acoder,
uint8_t *dst = c->pal_pic + x + y * stride;
uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride;
pix = decode_top_left_pixel(acoder, &sc->intra_pix_ctx);
pix = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0);
rgb_pix = c->pal[pix];
for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) {
memset(dst, pix, width);
@ -516,7 +495,7 @@ static int decode_region_inter(SliceContext *sc, ArithCoder *acoder,
mode = acoder->get_model_sym(acoder, &sc->inter_region);
if (!mode) {
mode = decode_top_left_pixel(acoder, &sc->inter_pix_ctx);
mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0);
if (c->avctx->err_recognition & AV_EF_EXPLODE &&
( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||