1 files changed, 105 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/glrenderer/TextureUploader.java b/src/com/android/gallery3d/glrenderer/TextureUploader.java
new file mode 100644
index 000000000..f17ab845c
--- /dev/null
+++ b/src/com/android/gallery3d/glrenderer/TextureUploader.java
@@ -0,0 +1,105 @@
+/*
+ * 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.
+ */
+
+package com.android.gallery3d.glrenderer;
+
+import com.android.gallery3d.ui.GLRoot;
+import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
+
+import java.util.ArrayDeque;
+
+public class TextureUploader implements OnGLIdleListener {
+    private static final int INIT_CAPACITY = 64;
+    private static final int QUOTA_PER_FRAME = 1;
+
+    private final ArrayDeque<UploadedTexture> mFgTextures =
+            new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
+    private final ArrayDeque<UploadedTexture> mBgTextures =
+            new ArrayDeque<UploadedTexture>(INIT_CAPACITY);
+    private final GLRoot mGLRoot;
+    private volatile boolean mIsQueued = false;
+
+    public TextureUploader(GLRoot root) {
+        mGLRoot = root;
+    }
+
+    public synchronized void clear() {
+        while (!mFgTextures.isEmpty()) {
+            mFgTextures.pop().setIsUploading(false);
+        }
+        while (!mBgTextures.isEmpty()) {
+            mBgTextures.pop().setIsUploading(false);
+        }
+    }
+
+    // caller should hold synchronized on "this"
+    private void queueSelfIfNeed() {
+        if (mIsQueued) return;
+        mIsQueued = true;
+        mGLRoot.addOnGLIdleListener(this);
+    }
+
+    public synchronized void addBgTexture(UploadedTexture t) {
+        if (t.isContentValid()) return;
+        mBgTextures.addLast(t);
+        t.setIsUploading(true);
+        queueSelfIfNeed();
+    }
+
+    public synchronized void addFgTexture(UploadedTexture t) {
+        if (t.isContentValid()) return;
+        mFgTextures.addLast(t);
+        t.setIsUploading(true);
+        queueSelfIfNeed();
+    }
+
+    private int upload(GLCanvas canvas, ArrayDeque<UploadedTexture> deque,
+            int uploadQuota, boolean isBackground) {
+        while (uploadQuota > 0) {
+            UploadedTexture t;
+            synchronized (this) {
+                if (deque.isEmpty()) break;
+                t = deque.removeFirst();
+                t.setIsUploading(false);
+                if (t.isContentValid()) continue;
+
+                // this has to be protected by the synchronized block
+                // to prevent the inner bitmap get recycled
+                t.updateContent(canvas);
+            }
+
+            // It will took some more time for a texture to be drawn for
+            // the first time.
+            // Thus, when scrolling, if a new column appears on screen,
+            // it may cause a UI jank even these textures are uploaded.
+            if (isBackground) t.draw(canvas, 0, 0);
+            --uploadQuota;
+        }
+        return uploadQuota;
+    }
+
+    @Override
+    public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
+        int uploadQuota = QUOTA_PER_FRAME;
+        uploadQuota = upload(canvas, mFgTextures, uploadQuota, false);
+        if (uploadQuota < QUOTA_PER_FRAME) mGLRoot.requestRender();
+        upload(canvas, mBgTextures, uploadQuota, true);
+        synchronized (this) {
+            mIsQueued = !mFgTextures.isEmpty() || !mBgTextures.isEmpty();
+            return mIsQueued;
+        }
+    }
+}