Initial HyperDRM 0.6.0: webOS ambient light app and native service

native/test_histogram.c

@@ -0,0 +1,25 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "histogram.h"
+int main(void) {
+ Histogram h={0};
+ assert(histogram_mean(h.bins[0])==0);
+ for(unsigned intensity=0;intensity<256;intensity++) {
+  memset(&h,0,sizeof(h));h.bins[0][intensity]=65535;
+  assert(histogram_mean(h.bins[0])==intensity);
+ }
+ /* Adjacent halfwords must stay independent, including the final bin. */
+ memset(&h,0,sizeof(h));h.bins[0][254]=65535;h.bins[0][255]=1;
+ assert(histogram_mean(h.bins[0])==254);
+ /* Weighted sum exceeds uint32 for full uint16 counts in every bin. */
+ for(unsigned b=0;b<256;b++)h.bins[0][b]=65535;
+ assert(histogram_mean(h.bins[0])==128);
+ for(unsigned primary=0;primary<3;primary++) {
+  memset(&h,0,sizeof(h));
+  for(unsigned c=0;c<3;c++)h.bins[c][c==primary?255:0]=100;
+  for(unsigned c=0;c<3;c++)assert(histogram_mean(h.bins[c])==(c==primary?255:0));
+ }
+ puts("PASS: ABI, all 256 intensities, adjacent bins, overflow, RGB primaries");
+ return 0;
+}