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Code cleanup for HistogramRemap.

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Avoid call to HistogramAddThresh when there's only one Histogram image.
Change-Id: I43b09e8e2d218c95969567034224777dcce37ab9
This commit is contained in:
Vikas Arora 2014-08-26 15:44:04 -07:00
parent f5c04d64b7
commit f4059d0c7d
1 changed files with 13 additions and 4 deletions
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17
src/enc/histogram.c
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@ -640,12 +640,15 @@ static void HistogramRemap(const VP8LHistogramSet* const orig_histo,
int i;
VP8LHistogram** const orig_histograms = orig_histo->histograms;
VP8LHistogram** const histograms = image_histo->histograms;
for (i = 0; i < orig_histo->size; ++i) {
const int orig_histo_size = orig_histo->size;
const int image_histo_size = image_histo->size;
if (image_histo_size > 1) {
for (i = 0; i < orig_histo_size; ++i) {
int best_out = 0;
double best_bits =
HistogramAddThresh(histograms[0], orig_histograms[i], MAX_COST);
int k;
for (k = 1; k < image_histo->size; ++k) {
for (k = 1; k < image_histo_size; ++k) {
const double cur_bits =
HistogramAddThresh(histograms[k], orig_histograms[i], best_bits);
if (cur_bits < best_bits) {
@ -655,13 +658,19 @@ static void HistogramRemap(const VP8LHistogramSet* const orig_histo,
}
symbols[i] = best_out;
}
} else {
assert(image_histo_size == 1);
for (i = 0; i < orig_histo_size; ++i) {
symbols[i] = 0;
}
}
// Recompute each out based on raw and symbols.
for (i = 0; i < image_histo->size; ++i) {
for (i = 0; i < image_histo_size; ++i) {
HistogramClear(histograms[i]);
}
for (i = 0; i < orig_histo->size; ++i) {
for (i = 0; i < orig_histo_size; ++i) {
const int idx = symbols[i];
VP8LHistogramAdd(orig_histograms[i], histograms[idx], histograms[idx]);
}