1 files changed, 52 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/glrenderer/CanvasTexture.java b/src/com/android/gallery3d/glrenderer/CanvasTexture.java
new file mode 100644
index 000000000..bff9d4baa
--- /dev/null
+++ b/src/com/android/gallery3d/glrenderer/CanvasTexture.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+package com.android.gallery3d.glrenderer;
+
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.Canvas;
+
+// CanvasTexture is a texture whose content is the drawing on a Canvas.
+// The subclasses should override onDraw() to draw on the bitmap.
+// By default CanvasTexture is not opaque.
+abstract class CanvasTexture extends UploadedTexture {
+    protected Canvas mCanvas;
+    private final Config mConfig;
+
+    public CanvasTexture(int width, int height) {
+        mConfig = Config.ARGB_8888;
+        setSize(width, height);
+        setOpaque(false);
+    }
+
+    @Override
+    protected Bitmap onGetBitmap() {
+        Bitmap bitmap = Bitmap.createBitmap(mWidth, mHeight, mConfig);
+        mCanvas = new Canvas(bitmap);
+        onDraw(mCanvas, bitmap);
+        return bitmap;
+    }
+
+    @Override
+    protected void onFreeBitmap(Bitmap bitmap) {
+        if (!inFinalizer()) {
+            bitmap.recycle();
+        }
+    }
+
+    abstract protected void onDraw(Canvas canvas, Bitmap backing);
+}