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diff --git a/src/com/android/gallery3d/ui/TiledTexture.java b/src/com/android/gallery3d/ui/TiledTexture.java
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+/*
+ * 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.ui;
+
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff.Mode;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.RectF;
+
+import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+
+// This class is similar to BitmapTexture, except the bitmap is
+// split into tiles. By doing so, we may increase the time required to
+// upload the whole bitmap but we reduce the time of uploading each tile
+// so it make the animation more smooth and prevents jank.
+public class TiledTexture {
+ private static final int CONTENT_SIZE = 254;
+ private static final int BORDER_SIZE = 1;
+ private static final int TILE_SIZE = CONTENT_SIZE + 2 * BORDER_SIZE;
+ private static final int INIT_CAPACITY = 8;
+
+ private static Tile sFreeTileHead = null;
+ private static final Object sFreeTileLock = new Object();
+
+ private static Bitmap sUploadBitmap;
+ private static Canvas sCanvas;
+ private static Paint sPaint;
+
+ private int mUploadIndex = 0;
+
+ private final Tile[] mTiles;
+ private final int mWidth;
+ private final int mHeight;
+ private final RectF mSrcRect = new RectF();
+ private final RectF mDestRect = new RectF();
+
+ public static class Uploader implements OnGLIdleListener {
+ private final ArrayDeque<TiledTexture> mTextures =
+ new ArrayDeque<TiledTexture>(INIT_CAPACITY);
+
+ private final GLRoot mGlRoot;
+ private boolean mIsQueued = false;
+
+ public Uploader(GLRoot glRoot) {
+ mGlRoot = glRoot;
+ }
+
+ public synchronized void clear() {
+ mTextures.clear();
+ }
+
+ public synchronized void addTexture(TiledTexture t) {
+ if (t.isReady()) return;
+ mTextures.addLast(t);
+
+ if (mIsQueued) return;
+ mIsQueued = true;
+ mGlRoot.addOnGLIdleListener(this);
+ }
+
+
+ @Override
+ public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
+ ArrayDeque<TiledTexture> deque = mTextures;
+ synchronized (this) {
+ if (!deque.isEmpty()) {
+ TiledTexture t = deque.peekFirst();
+ if (t.uploadNextTile(canvas)) {
+ deque.removeFirst();
+ mGlRoot.requestRender();
+ }
+ }
+ mIsQueued = !mTextures.isEmpty();
+
+ // return true to keep this listener in the queue
+ return mIsQueued;
+ }
+ }
+ }
+
+ private static class Tile extends UploadedTexture {
+ public int offsetX;
+ public int offsetY;
+ public Bitmap bitmap;
+ public Tile nextFreeTile;
+ public int contentWidth;
+ public int contentHeight;
+
+ @Override
+ public void setSize(int width, int height) {
+ contentWidth = width;
+ contentHeight = height;
+ mWidth = width + 2 * BORDER_SIZE;
+ mHeight = height + 2 * BORDER_SIZE;
+ mTextureWidth = TILE_SIZE;
+ mTextureHeight = TILE_SIZE;
+ }
+
+ @Override
+ protected Bitmap onGetBitmap() {
+ int x = BORDER_SIZE - offsetX;
+ int y = BORDER_SIZE - offsetY;
+ int r = bitmap.getWidth() - x;
+ int b = bitmap.getHeight() - y ;
+ sCanvas.drawBitmap(bitmap, x, y, null);
+ bitmap = null;
+
+ // draw borders if need
+ if (x > 0) sCanvas.drawLine(x - 1, 0, x - 1, TILE_SIZE, sPaint);
+ if (y > 0) sCanvas.drawLine(0, y - 1, TILE_SIZE, y - 1, sPaint);
+ if (r < CONTENT_SIZE) sCanvas.drawLine(r, 0, r, TILE_SIZE, sPaint);
+ if (b < CONTENT_SIZE) sCanvas.drawLine(0, b, TILE_SIZE, b, sPaint);
+
+ return sUploadBitmap;
+ }
+
+ @Override
+ protected void onFreeBitmap(Bitmap bitmap) {
+ // do nothing
+ }
+ }
+
+ private static void freeTile(Tile tile) {
+ tile.invalidateContent();
+ tile.bitmap = null;
+ synchronized (sFreeTileLock) {
+ tile.nextFreeTile = sFreeTileHead;
+ sFreeTileHead = tile;
+ }
+ }
+
+ private static Tile obtainTile() {
+ synchronized (sFreeTileLock) {
+ Tile result = sFreeTileHead;
+ if (result == null) return new Tile();
+ sFreeTileHead = result.nextFreeTile;
+ result.nextFreeTile = null;
+ return result;
+ }
+ }
+
+ private boolean uploadNextTile(GLCanvas canvas) {
+ if (mUploadIndex == mTiles.length) return true;
+ Tile next = mTiles[mUploadIndex++];
+ boolean hasBeenLoad = next.isLoaded();
+ next.updateContent(canvas);
+
+ // It will take some time for a texture to be drawn for the first
+ // time. When scrolling, we need to draw several tiles on the screen
+ // at the same time. It may cause a UI jank even these textures has
+ // been uploaded.
+ if (!hasBeenLoad) next.draw(canvas, 0, 0);
+ return mUploadIndex == mTiles.length;
+ }
+
+ public TiledTexture(Bitmap bitmap) {
+ mWidth = bitmap.getWidth();
+ mHeight = bitmap.getHeight();
+ ArrayList<Tile> list = new ArrayList<Tile>();
+
+ for (int x = 0, w = mWidth; x < w; x += CONTENT_SIZE) {
+ for (int y = 0, h = mHeight; y < h; y += CONTENT_SIZE) {
+ Tile tile = obtainTile();
+ tile.offsetX = x;
+ tile.offsetY = y;
+ tile.bitmap = bitmap;
+ tile.setSize(
+ Math.min(CONTENT_SIZE, mWidth - x),
+ Math.min(CONTENT_SIZE, mHeight - y));
+ list.add(tile);
+ }
+ }
+ mTiles = list.toArray(new Tile[list.size()]);
+ }
+
+ public boolean isReady() {
+ return mUploadIndex == mTiles.length;
+ }
+
+ public void recycle() {
+ for (int i = 0, n = mTiles.length; i < n; ++i) {
+ freeTile(mTiles[i]);
+ }
+ }
+
+ public static void freeResources() {
+ sUploadBitmap = null;
+ sCanvas = null;
+ sPaint = null;
+ }
+
+ public static void prepareResources() {
+ sUploadBitmap = Bitmap.createBitmap(TILE_SIZE, TILE_SIZE, Config.ARGB_8888);
+ sCanvas = new Canvas(sUploadBitmap);
+ sPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
+ sPaint.setColor(Color.TRANSPARENT);
+ sPaint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
+ }
+
+ // We want to draw the "source" on the "target".
+ // This method is to find the "output" rectangle which is
+ // the corresponding area of the "src".
+ // (x,y) target
+ // (x0,y0) source +---------------+
+ // +----------+ | |
+ // | src | | output |
+ // | +--+ | linear map | +----+ |
+ // | +--+ | ----------> | | | |
+ // | | by (scaleX, scaleY) | +----+ |
+ // +----------+ | |
+ // Texture +---------------+
+ // Canvas
+ private static void mapRect(RectF output,
+ RectF src, float x0, float y0, float x, float y, float scaleX,
+ float scaleY) {
+ output.set(x + (src.left - x0) * scaleX,
+ y + (src.top - y0) * scaleY,
+ x + (src.right - x0) * scaleX,
+ y + (src.bottom - y0) * scaleY);
+ }
+
+ // Draws a mixed color of this texture and a specified color onto the
+ // a rectangle. The used color is: from * (1 - ratio) + to * ratio.
+ public void drawMixed(GLCanvas canvas, int color, float ratio,
+ int x, int y, int width, int height) {
+ RectF src = mSrcRect;
+ RectF dest = mDestRect;
+ float scaleX = (float) width / mWidth ;
+ float scaleY = (float) height / mHeight;
+ for (int i = 0, n = mTiles.length; i < n; ++i) {
+ Tile t = mTiles[i];
+ src.set(0, 0, t.contentWidth, t.contentHeight);
+ src.offset(t.offsetX, t.offsetY);
+ mapRect(dest, src, 0, 0, x, y, scaleX, scaleY);
+ src.offset(BORDER_SIZE - t.offsetX, BORDER_SIZE - t.offsetY);
+ canvas.drawMixed(t, color, ratio, mSrcRect, mDestRect);
+ }
+ }
+
+ // Draws the texture on to the specified rectangle.
+ public void draw(GLCanvas canvas, int x, int y, int width, int height) {
+ RectF src = mSrcRect;
+ RectF dest = mDestRect;
+ float scaleX = (float) width / mWidth ;
+ float scaleY = (float) height / mHeight;
+ for (int i = 0, n = mTiles.length; i < n; ++i) {
+ Tile t = mTiles[i];
+ src.set(0, 0, t.contentWidth, t.contentHeight);
+ src.offset(t.offsetX, t.offsetY);
+ mapRect(dest, src, 0, 0, x, y, scaleX, scaleY);
+ src.offset(BORDER_SIZE - t.offsetX, BORDER_SIZE - t.offsetY);
+ canvas.drawTexture(t, mSrcRect, mDestRect);
+ }
+ }
+
+ // Draws a sub region of this texture on to the specified rectangle.
+ public void draw(GLCanvas canvas, RectF source, RectF target) {
+ RectF src = mSrcRect;
+ RectF dest = mDestRect;
+ float x0 = source.left;
+ float y0 = source.top;
+ float x = target.left;
+ float y = target.top;
+ float scaleX = target.width() / source.width();
+ float scaleY = target.height() / source.height();
+
+ for (int i = 0, n = mTiles.length; i < n; ++i) {
+ Tile t = mTiles[i];
+ src.set(0, 0, t.contentWidth, t.contentHeight);
+ src.offset(t.offsetX, t.offsetY);
+ if (!src.intersect(source)) continue;
+ mapRect(dest, src, x0, y0, x, y, scaleX, scaleY);
+ src.offset(BORDER_SIZE - t.offsetX, BORDER_SIZE - t.offsetY);
+ canvas.drawTexture(t, src, dest);
+ }
+ }
+}
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