From 3cac6dd4d4c28ee7b0833715fae77ca5ddf4d77d Mon Sep 17 00:00:00 2001
From: John Hoford <hoford@google.com>
Date: Tue, 2 Oct 2012 18:12:03 -0700
Subject: Add Shadow feature

bug:7234321
Change-Id: Ib0d4db773486e469ed818385b68b7b907070c297
---
 .../gallery3d/filtershow/FilterShowActivity.java   |  6 +--
 .../filtershow/filters/ImageFilterShadows.java     | 61 ++++++++++++++++++++++
 .../gallery3d/filtershow/ui/ControlPoint.java      |  2 +-
 3 files changed, 65 insertions(+), 4 deletions(-)
 create mode 100644 src/com/android/gallery3d/filtershow/filters/ImageFilterShadows.java

diff --git a/src/com/android/gallery3d/filtershow/FilterShowActivity.java b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
index b50ab94d6..694f51290 100644
--- a/src/com/android/gallery3d/filtershow/FilterShowActivity.java
+++ b/src/com/android/gallery3d/filtershow/FilterShowActivity.java
@@ -783,14 +783,14 @@ public class FilterShowActivity extends Activity implements OnItemClickListener,
                 mImageShow.setVisibility(View.VISIBLE);
                 mImageShow.setShowControls(true);
                 ImagePreset preset = mImageShow.getImagePreset();
-                ImageFilter filter = preset.getFilter("Hue");
+                ImageFilter filter = preset.getFilter("Shadows");
                 if (filter == null) {
-                    ImageFilterHue contrast = new ImageFilterHue();
+                    ImageFilterShadows contrast = new ImageFilterShadows();
                     ImagePreset copy = new ImagePreset(preset);
                     copy.add(contrast);
                     copy.setHistoryName(contrast.getName());
                     copy.setIsFx(false);
-                    filter = copy.getFilter("Hue");
+                    filter = copy.getFilter("Shadows");
                     mImageShow.setImagePreset(copy);
                 }
                 mImageShow.setCurrentFilter(filter);
diff --git a/src/com/android/gallery3d/filtershow/filters/ImageFilterShadows.java b/src/com/android/gallery3d/filtershow/filters/ImageFilterShadows.java
new file mode 100644
index 000000000..39c95064b
--- /dev/null
+++ b/src/com/android/gallery3d/filtershow/filters/ImageFilterShadows.java
@@ -0,0 +1,61 @@
+
+package com.android.gallery3d.filtershow.filters;
+
+import android.graphics.Bitmap;
+
+import com.android.gallery3d.filtershow.ui.ControlPoint;
+import com.android.gallery3d.filtershow.ui.Spline;
+
+public class ImageFilterShadows extends ImageFilter {
+    private final float SHADOW = .1f;
+    private final float MID = .5f;
+    private final float HIGHLIGHT = .9f;
+
+    private float []baseX = {0f,SHADOW,MID,HIGHLIGHT,1f};
+    private float []baseY = {0f,SHADOW,MID,HIGHLIGHT,1f};
+
+    public ImageFilterShadows() {
+        mName = "Shadows";
+
+    }
+    short [] calcMap(){
+        Spline sp = new Spline();
+        for (int i = 0; i < baseX.length; i++) {
+            sp.addPoint(baseX[i], baseY[i]);
+        }
+        int max = 4080;
+        int w = 40800;
+        float []px = new float[w+1];
+        float []py = new float[w+1];
+        short []vlut = new short[4080+1];
+        for (int i = 0; i < px.length; i++) {
+            float t = i/(float)(w);
+
+            ControlPoint p = sp.getPoint(t);
+            px[i] = p.x;
+            py[i] = p.y;
+        }
+        for (int i = 0; i < py.length; i++) {
+            short x = (short)Math.min(4080,Math.max(0,((int)(px[i]*max))));
+            short y = (short)Math.min(4082,Math.max(0,((int)(py[i]*max))));
+            vlut[x] = y;
+        }
+        return vlut;
+    }
+    @Override
+    public ImageFilter clone() throws CloneNotSupportedException {
+        ImageFilterShadows filter = (ImageFilterShadows) super.clone();
+        return filter;
+    }
+
+    native protected void nativeApplyFilter(Bitmap bitmap, int w, int h, short []valMap);
+
+    public void apply(Bitmap bitmap) {
+        int w = bitmap.getWidth();
+        int h = bitmap.getHeight();
+        float p = mParameter;
+        baseY[1] = (float)(SHADOW*Math.pow(4, mParameter/100.));
+
+        nativeApplyFilter(bitmap, w, h, calcMap());
+    }
+}
diff --git a/src/com/android/gallery3d/filtershow/ui/ControlPoint.java b/src/com/android/gallery3d/filtershow/ui/ControlPoint.java
index 6daa96182..68b799a9e 100644
--- a/src/com/android/gallery3d/filtershow/ui/ControlPoint.java
+++ b/src/com/android/gallery3d/filtershow/ui/ControlPoint.java
@@ -1,7 +1,7 @@
 
 package com.android.gallery3d.filtershow.ui;
 
-class ControlPoint implements Comparable {
+public class ControlPoint implements Comparable {
     public ControlPoint(float px, float py) {
         x = px;
         y = py;
-- 
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