1 files changed, 113 insertions, 0 deletions
diff --git a/tests/java_api/ImageProcessing/src/com/android/rs/image/wbalance.rscript b/tests/java_api/ImageProcessing/src/com/android/rs/image/wbalance.rscript
new file mode 100644
index 00000000..c46c4912
--- /dev/null
+++ b/tests/java_api/ImageProcessing/src/com/android/rs/image/wbalance.rscript
@@ -0,0 +1,113 @@
+/*
+ * 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 "ip.rsh"
+#pragma rs_fp_relaxed
+
+rs_allocation histogramValues;
+static float3 scale;
+
+static uchar4 estimateWhite() {
+    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 (int i = 1; i < 255; i++) {
+        int4 hv = rsGetElementAt_int4(histogramValues, i);
+        int r = hv.r;
+        int g = hv.g;
+        int b = hv.b;
+        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 (int i = 254; i >0; i--) {
+        int4 hv = rsGetElementAt_int4(histogramValues, i);
+        int r = hv.r;
+        int g = hv.g;
+        int b = hv.b;
+        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;
+        }
+
+    }
+
+    uchar4 out;
+
+    if ((count15r>0) && (count15g>0) && (count15b>0) ){
+        out.r = sum15r/count15r;
+        out.g = sum15g/count15g;
+        out.b = sum15b/count15b;
+    }else {
+        out.r = out.g = out.b = 255;
+    }
+
+    return out;
+
+}
+
+void prepareWhiteBalance() {
+    uchar4 estimation = estimateWhite();
+    int minimum = min(estimation.r, min(estimation.g, estimation.b));
+    int maximum = max(estimation.r, max(estimation.g, estimation.b));
+    float avg = (minimum + maximum) / 2.f;
+
+    scale.r =  avg / estimation.r;
+    scale.g =  avg / estimation.g;
+    scale.b =  avg / estimation.b;
+}
+
+uchar4 RS_KERNEL whiteBalanceKernel(uchar4 in) {
+    float3 t = convert_float3(in.rgb);
+    t *= scale;
+    t = min(t, 255.f);
+
+    uchar4 out;
+    out.rgb = convert_uchar3(t);
+    out.a = 255;
+    return out;
+}