Merge pull request livecode#3511 from livecodeian/bugfix-13636

livecodepanos · livecodepanos · commit ee83234fbf5d · 2016-02-01T09:39:40.000Z
[[ Bug 13636 ]] Implement screen snapshot on Android
diff --git a/docs/notes/bugfix-13636.md b/docs/notes/bugfix-13636.md
@@ -0,0 +1 @@
+# export snapshot not working on Android
diff --git a/engine/src/java/com/runrev/android/Engine.java b/engine/src/java/com/runrev/android/Engine.java
@@ -1052,6 +1052,21 @@ public void onListPickerDone(int p_index, boolean p_done)
             doProcess(false);
     }
 
+////////////////////////////////////////////////////////////////////////////////
+	
+	// Return a bitmap snapshot of the specified region of the root view
+	public Object getSnapshotBitmapAtSize(int x, int y, int width, int height, int sizeWidth, int sizeHeight)
+	{
+		Bitmap t_bitmap = Bitmap.createBitmap(sizeWidth, sizeHeight, Bitmap.Config.ARGB_8888);
+		Canvas t_canvas = new Canvas(t_bitmap);
+		t_canvas.scale((float)sizeWidth / (float)width, (float)sizeHeight / (float)height);
+		t_canvas.translate((float)-x, (float)-y);
+		
+		getActivity().getWindow().getDecorView().getRootView().draw(t_canvas);
+		
+		return t_bitmap;
+	}
+	
 ////////////////////////////////////////////////////////////////////////////////
 
 	public String getSystemVersion()
diff --git a/engine/src/mblandroiddc.cpp b/engine/src/mblandroiddc.cpp
@@ -453,7 +453,54 @@ void MCScreenDC::setbeep(uint4 property, int4 beep)
 
 MCImageBitmap *MCScreenDC::snapshot(MCRectangle &r, uint4 window, MCStringRef displayname, MCPoint *size)
 {
-	return NULL;
+	// scale rectangle from logical -> device coords
+	MCRectangle t_rect;
+	t_rect = logicaltoscreenrect(r);
+	
+	// don't scale size - we want the bitmap to be sized to logical coords.
+	int16_t t_size_width, t_size_height;
+	if (size != nil)
+	{
+		t_size_width = size->x;
+		t_size_height = size->y;
+	}
+	else
+	{
+		t_size_width = r.width;
+		t_size_height = r.height;
+	}
+	
+	jobject t_bitmap;
+	// get snapshot image as java Bitmap object
+	MCAndroidEngineRemoteCall("getSnapshotBitmapAtSize", "oiiiiii", &t_bitmap, t_rect.x, t_rect.y, t_rect.width, t_rect.height, t_size_width, t_size_height);
+	if (t_bitmap == nil)
+		return nil;
+	
+	// read Bitmap info & data into MCImageBitmap struct
+	JNIEnv *env;
+	env = MCJavaGetThreadEnv();
+	AndroidBitmapInfo t_info;
+	AndroidBitmap_getInfo(env, t_bitmap, &t_info);
+	
+	MCImageBitmap t_imagebitmap;
+	t_imagebitmap.width = t_info.width;
+	t_imagebitmap.height = t_info.height;
+	t_imagebitmap.stride = t_info.stride;
+	
+	if (AndroidBitmap_lockPixels(env, t_bitmap, (void**)&t_imagebitmap.data) < 0)
+		return nil;
+	
+	MCImageBitmapCheckTransparency(&t_imagebitmap);
+	
+	MCImageBitmap *t_copy;
+	t_copy = nil;
+	
+	// return a copy of the image bitmap
+	MCImageCopyBitmap(&t_imagebitmap, t_copy);
+	
+	AndroidBitmap_unlockPixels(env, t_bitmap);
+	
+	return t_copy;
 }
 
 ////////////////////////////////////////////////////////////////////////////////

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+# export snapshot not working on Android`