Initial HyperDRM 0.6.0: webOS ambient light app and native service

native/blackbars.h

@@ -0,0 +1,19 @@
+#ifndef BLACKBARS_H
+#define BLACKBARS_H
+/* Calibrated preset-0 edge probes on this G4. Return -1 for an ambiguous
+ * or dark frame so darkness alone cannot switch the active capture mode. */
+static inline int letterbox_candidate(const unsigned black[16],const unsigned char color[16][3]) {
+ const unsigned interior[]={2,6,10,15};unsigned lit=0;
+ for(unsigned i=0;i<4;i++){
+  unsigned r=interior[i],peak=color[r][0];
+  for(unsigned c=1;c<3;c++)if(color[r][c]>peak)peak=color[r][c];
+  if(black[r]<20 && peak>35)lit++;
+ }
+ if(lit<2)return -1;
+ unsigned top=(black[3]+black[11]+black[12])/3;
+ unsigned bottom=(black[1]+black[5]+black[9])/3;
+ if(top>=55 && bottom>=25)return 1;
+ if(top<20 && bottom<20)return 0;
+ return -1;
+}
+#endif