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-rw-r--r--src/com/android/gallery3d/glrenderer/FadeTexture.java81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/glrenderer/FadeTexture.java b/src/com/android/gallery3d/glrenderer/FadeTexture.java
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+++ b/src/com/android/gallery3d/glrenderer/FadeTexture.java
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+/*
+ * Copyright (C) 2011 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.common.Utils;
+import com.android.gallery3d.ui.AnimationTime;
+
+// FadeTexture is a texture which fades the given texture along the time.
+public abstract class FadeTexture implements Texture {
+ @SuppressWarnings("unused")
+ private static final String TAG = "FadeTexture";
+
+ // The duration of the fading animation in milliseconds
+ public static final int DURATION = 180;
+
+ private final long mStartTime;
+ private final int mWidth;
+ private final int mHeight;
+ private final boolean mIsOpaque;
+ private boolean mIsAnimating;
+
+ public FadeTexture(int width, int height, boolean opaque) {
+ mWidth = width;
+ mHeight = height;
+ mIsOpaque = opaque;
+ mStartTime = now();
+ mIsAnimating = true;
+ }
+
+ @Override
+ public void draw(GLCanvas canvas, int x, int y) {
+ draw(canvas, x, y, mWidth, mHeight);
+ }
+
+ @Override
+ public boolean isOpaque() {
+ return mIsOpaque;
+ }
+
+ @Override
+ public int getWidth() {
+ return mWidth;
+ }
+
+ @Override
+ public int getHeight() {
+ return mHeight;
+ }
+
+ public boolean isAnimating() {
+ if (mIsAnimating) {
+ if (now() - mStartTime >= DURATION) {
+ mIsAnimating = false;
+ }
+ }
+ return mIsAnimating;
+ }
+
+ protected float getRatio() {
+ float r = (float)(now() - mStartTime) / DURATION;
+ return Utils.clamp(1.0f - r, 0.0f, 1.0f);
+ }
+
+ private long now() {
+ return AnimationTime.get();
+ }
+}