From dbc7b1ebe939d68cbc7f01878e038ca3e9c35f89 Mon Sep 17 00:00:00 2001
From: nicolasroard <nicolasroard@google.com>
Date: Tue, 2 Jul 2013 13:21:31 -0700
Subject: Add stop check in ImageFilterFX

speed up switching / interrupting of rendering.

Change-Id: I3ef4b1d16047b00a062c86d72cdfff2bfe9817a2
---
 .../gallery3d/filtershow/filters/IconUtilities.java   |  5 +++--
 .../gallery3d/filtershow/filters/ImageFilterFx.java   | 19 +++++++++++++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/com/android/gallery3d/filtershow/filters/IconUtilities.java b/src/com/android/gallery3d/filtershow/filters/IconUtilities.java
index 38211f3c9..e2a01472d 100644
--- a/src/com/android/gallery3d/filtershow/filters/IconUtilities.java
+++ b/src/com/android/gallery3d/filtershow/filters/IconUtilities.java
@@ -64,8 +64,9 @@ public class IconUtilities {
                 int h = bitmap.getHeight();
                 int fxw = fxBitmap.getWidth();
                 int fxh = fxBitmap.getHeight();
-
-                nativeApplyFilter(bitmap, w, h, fxBitmap, fxw, fxh);
+                int start = 0;
+                int end = w * h * 4;
+                nativeApplyFilter(bitmap, w, h, fxBitmap, fxw, fxh, start, end);
                 return bitmap;
             }
         };
diff --git a/src/com/android/gallery3d/filtershow/filters/ImageFilterFx.java b/src/com/android/gallery3d/filtershow/filters/ImageFilterFx.java
index 51c66127b..19bea593b 100644
--- a/src/com/android/gallery3d/filtershow/filters/ImageFilterFx.java
+++ b/src/com/android/gallery3d/filtershow/filters/ImageFilterFx.java
@@ -51,7 +51,9 @@ public class ImageFilterFx extends ImageFilter {
         return mParameters;
     }
 
-    native protected void nativeApplyFilter(Bitmap bitmap, int w, int h,Bitmap  fxBitmap, int fxw, int fxh);
+    native protected void nativeApplyFilter(Bitmap bitmap, int w, int h,
+                                            Bitmap fxBitmap, int fxw, int fxh,
+                                            int start, int end);
 
     @Override
     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
@@ -85,7 +87,20 @@ public class ImageFilterFx extends ImageFilter {
         int fxw = mFxBitmap.getWidth();
         int fxh = mFxBitmap.getHeight();
 
-        nativeApplyFilter(bitmap, w, h, mFxBitmap, fxw, fxh);
+        int stride = w * 4;
+        int max = stride * h;
+        int increment = stride * 256; // 256 lines
+        for (int i = 0; i < max; i += increment) {
+            int start = i;
+            int end = i + increment;
+            if (end > max) {
+                end = max;
+            }
+            if (!getEnvironment().needsStop()) {
+                nativeApplyFilter(bitmap, w, h, mFxBitmap, fxw, fxh, start, end);
+            }
+        }
+
         return bitmap;
     }
 
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