From d0fc0f5fd56f2f2aedcf7ea6583f59a405eea103 Mon Sep 17 00:00:00 2001
From: John Hoford <hoford@google.com>
Date: Wed, 10 Oct 2012 14:17:30 -0700
Subject: add White balance & disable UI elements

bug:7234321
Change-Id: Ic44bfe30b5d25e7d4442c4e6d4fd9e0e8410c7af
---
 jni/filters/wbalance.c | 169 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 jni/filters/wbalance.c

(limited to 'jni/filters')

diff --git a/jni/filters/wbalance.c b/jni/filters/wbalance.c
new file mode 100644
index 000000000..2b92b9978
--- /dev/null
+++ b/jni/filters/wbalance.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "filters.h"
+
+void estmateWhite(unsigned char *src, int len, int *wr, int *wb, int *wg){
+
+    int STEP = 4;
+    int RANGE = 256;
+    int *histR = (int *) malloc(256*sizeof(int));
+    int *histG = (int *) malloc(256*sizeof(int));
+    int *histB = (int *) malloc(256*sizeof(int));
+    int i;
+    for (i = 0; i < 255; i++) {
+        histR[i] = histG[i] = histB[i] =0;
+    }
+
+    for (i = 0; i < len; i+=STEP) {
+        histR[(src[RED])]++;
+        histG[(src[GREEN])]++;
+        histB[(src[BLUE])]++;
+    }
+    int min_r = -1, min_g = -1,min_b = -1;
+    int max_r = 0, max_g = 0,max_b = 0;
+    int sum_r = 0,sum_g=0,sum_b=0;
+
+    for (i = 1; i < RANGE-1; i++) {
+        int r = histR[i];
+        int g = histG[i];
+        int b = histB[i];
+        sum_r += r;
+        sum_g += g;
+        sum_b += b;
+
+        if (r>0){
+            if (min_r < 0) min_r = i;
+            max_r = i;
+        }
+        if (g>0){
+            if (min_g < 0) min_g = i;
+            max_g = i;
+        }
+        if (b>0){
+            if (min_b < 0) min_b = i;
+            max_b = i;
+        }
+    }
+
+    int sum15r = 0,sum15g=0,sum15b=0;
+    int count15r = 0,count15g=0,count15b=0;
+    int tmp_r = 0,tmp_g=0,tmp_b=0;
+
+    for (i = RANGE-2; i >0; i--) {
+        int r = histR[i];
+        int g = histG[i];
+        int b = histB[i];
+        tmp_r += r;
+        tmp_g += g;
+        tmp_b += b;
+
+        if ((tmp_r > sum_r/20) && (tmp_r < sum_r/5)) {
+            sum15r += r*i;
+            count15r += r;
+        }
+        if ((tmp_g > sum_g/20) && (tmp_g < sum_g/5)) {
+            sum15g += g*i;
+            count15g += g;
+        }
+        if ((tmp_b > sum_b/20) && (tmp_b < sum_b/5)) {
+            sum15b += b*i;
+            count15b += b;
+        }
+
+    }
+    free(histR);
+    free(histG);
+    free(histB);
+
+    if ((count15r>0) && (count15g>0) && (count15b>0) ){
+        *wr = sum15r/count15r;
+        *wb = sum15g/count15g;
+        *wg = sum15b/count15b;
+    }else {
+        *wg  = *wb = *wr=255;
+    }
+}
+
+void estmateWhiteBox(unsigned char *src, int iw, int ih, int x,int y, int *wr, int *wb, int *wg){
+    int r;
+    int g;
+    int b;
+    int sum;
+    int xp,yp;
+    int bounds = 5;
+    if (x<0) x = bounds;
+    if (y<0) y = bounds;
+    if (x>=(iw-bounds)) x = (iw-bounds-1);
+    if (y>=(ih-bounds)) y = (ih-bounds-1);
+    int startx = x - bounds;
+    int starty = y - bounds;
+    int endx = x + bounds;
+    int endy = y + bounds;
+
+    for(yp= starty;yp<endy;yp++) {
+        for(xp= startx;xp<endx;xp++) {
+            int i = 4*(xp+yp*iw);
+            r += src[RED];
+            g += src[GREEN];
+            b += src[BLUE];
+            sum++;
+        }
+    }
+    *wr = r/sum;
+    *wg = g/sum;
+    *wb = b/sum;
+}
+
+void JNIFUNCF(ImageFilterWBalance, nativeApplyFilter, jobject bitmap, jint width, jint height, int locX,int locY)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    unsigned char * rgb = (unsigned char * )destination;
+    int wr;
+    int wg;
+    int wb;
+
+    if (locX==-1)
+        estmateWhite(rgb,len,&wr,&wg,&wb);
+    else
+        estmateWhiteBox(rgb, width, height,locX,locY,&wr,&wg,&wb);
+
+    int min = MIN(wr, MIN(wg, wb));
+    int max = MAX(wr, MAX(wg, wb));
+    float avg = (min+max)/2.f;
+    float scaleR =  avg/wr;
+    float scaleG =  avg/wg;
+    float scaleB =  avg/wb;
+
+    for (i = 0; i < len; i+=4)
+    {
+        int r = rgb[RED];
+        int g = rgb[GREEN];
+        int b = rgb[BLUE];
+
+        float Rc =  r*scaleR;
+        float Gc =  g*scaleG;
+        float Bc =  b*scaleB;
+
+        rgb[RED]   = clamp(Rc);
+        rgb[GREEN] = clamp(Gc);
+        rgb[BLUE]  = clamp(Bc);
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}
-- 
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