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avfilter/palettegen: rename variance to cut_score

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"Variance" wasn't exactly the correct word; "cut score" is more
agnostic, which will be useful when changing the algorithm in the next
commit.
This commit is contained in:
Clément Bœsch 2022-12-27 14:47:20 +01:00
parent e49fc1a6ef
commit 187f5e7f90
1 changed files with 6 additions and 6 deletions
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12
libavfilter/vf_palettegen.c
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@ -42,7 +42,7 @@ struct range_box {
uint32_t color; // average color uint32_t color; // average color
int major_axis; // best axis candidate for cutting the box int major_axis; // best axis candidate for cutting the box
uint64_t weight; // sum of all the weights of the colors uint64_t weight; // sum of all the weights of the colors
int64_t variance; // overall variance of the box (how much the colors are spread) int64_t cut_score; // how likely the box is to be cut down (higher implying more likely)
int start; // index in PaletteGenContext->refs int start; // index in PaletteGenContext->refs
int len; // number of referenced colors int len; // number of referenced colors
int sorted_by; // whether range of colors is sorted by red (0), green (1) or blue (2) int sorted_by; // whether range of colors is sorted by red (0), green (1) or blue (2)
@ -171,25 +171,25 @@ static void compute_box_stats(PaletteGenContext *s, struct range_box *box)
if (er2[0] >= er2[1] && er2[0] >= er2[2]) box->major_axis = 0; if (er2[0] >= er2[1] && er2[0] >= er2[2]) box->major_axis = 0;
if (er2[1] >= er2[0] && er2[1] >= er2[2]) box->major_axis = 1; // prefer green again if (er2[1] >= er2[0] && er2[1] >= er2[2]) box->major_axis = 1; // prefer green again
box->variance = er2[0] + er2[1] + er2[2]; box->cut_score = er2[0] + er2[1] + er2[2];
} }
/** /**
* Find the next box to split: pick the one with the highest variance * Find the next box to split: pick the one with the highest cut score
*/ */
static int get_next_box_id_to_split(PaletteGenContext *s) static int get_next_box_id_to_split(PaletteGenContext *s)
{ {
int box_id, best_box_id = -1; int box_id, best_box_id = -1;
int64_t max_variance = -1; int64_t max_score = -1;
if (s->nb_boxes == s->max_colors - s->reserve_transparent) if (s->nb_boxes == s->max_colors - s->reserve_transparent)
return -1; return -1;
for (box_id = 0; box_id < s->nb_boxes; box_id++) { for (box_id = 0; box_id < s->nb_boxes; box_id++) {
struct range_box *box = &s->boxes[box_id]; struct range_box *box = &s->boxes[box_id];
if (s->boxes[box_id].len >= 2 && box->variance > max_variance) { if (s->boxes[box_id].len >= 2 && box->cut_score > max_score) {
best_box_id = box_id; best_box_id = box_id;
max_variance = box->variance; max_score = box->cut_score;
} }
} }
return best_box_id; return best_box_id;