Java tutorial
/* * Copyright (C) 2013 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.aidy.launcher3.photos.views; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Rect; import android.graphics.RectF; import android.support.v4.util.LongSparseArray; import android.util.DisplayMetrics; import android.util.Log; import android.view.View; import android.view.WindowManager; import com.aidy.launcher3.gallery3d.common.Utils; import com.aidy.launcher3.gallery3d.glrenderer.BasicTexture; import com.aidy.launcher3.gallery3d.glrenderer.GLCanvas; import com.aidy.launcher3.gallery3d.glrenderer.UploadedTexture; import com.aidy.launcher3.support.utils.Pools.Pool; import com.aidy.launcher3.support.utils.Pools.SynchronizedPool; /** * Handles laying out, decoding, and drawing of tiles in GL */ public class TiledImageRenderer { public static final int SIZE_UNKNOWN = -1; private static final String TAG = "TiledImageRenderer"; private static final int UPLOAD_LIMIT = 1; /* * This is the tile state in the CPU side. * Life of a Tile: * ACTIVATED (initial state) * --> IN_QUEUE - by queueForDecode() * --> RECYCLED - by recycleTile() * IN_QUEUE --> DECODING - by decodeTile() * --> RECYCLED - by recycleTile) * DECODING --> RECYCLING - by recycleTile() * --> DECODED - by decodeTile() * --> DECODE_FAIL - by decodeTile() * RECYCLING --> RECYCLED - by decodeTile() * DECODED --> ACTIVATED - (after the decoded bitmap is uploaded) * DECODED --> RECYCLED - by recycleTile() * DECODE_FAIL -> RECYCLED - by recycleTile() * RECYCLED --> ACTIVATED - by obtainTile() */ private static final int STATE_ACTIVATED = 0x01; private static final int STATE_IN_QUEUE = 0x02; private static final int STATE_DECODING = 0x04; private static final int STATE_DECODED = 0x08; private static final int STATE_DECODE_FAIL = 0x10; private static final int STATE_RECYCLING = 0x20; private static final int STATE_RECYCLED = 0x40; private static Pool<Bitmap> sTilePool = new SynchronizedPool<Bitmap>(64); // TILE_SIZE must be 2^N private int mTileSize; private TileSource mModel; private BasicTexture mPreview; protected int mLevelCount; // cache the value of mScaledBitmaps.length // The mLevel variable indicates which level of bitmap we should use. // Level 0 means the original full-sized bitmap, and a larger value means // a smaller scaled bitmap (The width and height of each scaled bitmap is // half size of the previous one). If the value is in [0, mLevelCount), we // use the bitmap in mScaledBitmaps[mLevel] for display, otherwise the value // is mLevelCount private int mLevel = 0; private int mOffsetX; private int mOffsetY; private int mUploadQuota; private boolean mRenderComplete; private final RectF mSourceRect = new RectF(); private final RectF mTargetRect = new RectF(); private final LongSparseArray<Tile> mActiveTiles = new LongSparseArray<Tile>(); // The following three queue are guarded by mQueueLock private final Object mQueueLock = new Object(); private final TileQueue mRecycledQueue = new TileQueue(); private final TileQueue mUploadQueue = new TileQueue(); private final TileQueue mDecodeQueue = new TileQueue(); // The width and height of the full-sized bitmap protected int mImageWidth = SIZE_UNKNOWN; protected int mImageHeight = SIZE_UNKNOWN; protected int mCenterX; protected int mCenterY; protected float mScale; protected int mRotation; private boolean mLayoutTiles; // Temp variables to avoid memory allocation private final Rect mTileRange = new Rect(); private final Rect mActiveRange[] = { new Rect(), new Rect() }; private TileDecoder mTileDecoder; private boolean mBackgroundTileUploaded; private int mViewWidth, mViewHeight; private View mParent; /** * Interface for providing tiles to a {@link TiledImageRenderer} */ public static interface TileSource { /** * If the source does not care about the tile size, it should use * {@link TiledImageRenderer#suggestedTileSize(Context)} */ public int getTileSize(); public int getImageWidth(); public int getImageHeight(); public int getRotation(); /** * Return a Preview image if available. This will be used as the base layer * if higher res tiles are not yet available */ public BasicTexture getPreview(); /** * The tile returned by this method can be specified this way: Assuming * the image size is (width, height), first take the intersection of (0, * 0) - (width, height) and (x, y) - (x + tileSize, y + tileSize). If * in extending the region, we found some part of the region is outside * the image, those pixels are filled with black. * * If level > 0, it does the same operation on a down-scaled version of * the original image (down-scaled by a factor of 2^level), but (x, y) * still refers to the coordinate on the original image. * * The method would be called by the decoder thread. */ public Bitmap getTile(int level, int x, int y, Bitmap reuse); } public static int suggestedTileSize(Context context) { return isHighResolution(context) ? 512 : 256; } private static boolean isHighResolution(Context context) { DisplayMetrics metrics = new DisplayMetrics(); WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); wm.getDefaultDisplay().getMetrics(metrics); return metrics.heightPixels > 2048 || metrics.widthPixels > 2048; } public TiledImageRenderer(View parent) { mParent = parent; mTileDecoder = new TileDecoder(); mTileDecoder.start(); } public int getViewWidth() { return mViewWidth; } public int getViewHeight() { return mViewHeight; } private void invalidate() { mParent.postInvalidate(); } public void setModel(TileSource model, int rotation) { if (mModel != model) { mModel = model; notifyModelInvalidated(); } if (mRotation != rotation) { mRotation = rotation; mLayoutTiles = true; } } private void calculateLevelCount() { if (mPreview != null) { mLevelCount = Math.max(0, Utils.ceilLog2(mImageWidth / (float) mPreview.getWidth())); } else { int levels = 1; int maxDim = Math.max(mImageWidth, mImageHeight); int t = mTileSize; while (t < maxDim) { t <<= 1; levels++; } mLevelCount = levels; } } public void notifyModelInvalidated() { invalidateTiles(); if (mModel == null) { mImageWidth = 0; mImageHeight = 0; mLevelCount = 0; mPreview = null; } else { mImageWidth = mModel.getImageWidth(); mImageHeight = mModel.getImageHeight(); mPreview = mModel.getPreview(); mTileSize = mModel.getTileSize(); calculateLevelCount(); } mLayoutTiles = true; } public void setViewSize(int width, int height) { mViewWidth = width; mViewHeight = height; } public void setPosition(int centerX, int centerY, float scale) { if (mCenterX == centerX && mCenterY == centerY && mScale == scale) { return; } mCenterX = centerX; mCenterY = centerY; mScale = scale; mLayoutTiles = true; } // Prepare the tiles we want to use for display. // // 1. Decide the tile level we want to use for display. // 2. Decide the tile levels we want to keep as texture (in addition to // the one we use for display). // 3. Recycle unused tiles. // 4. Activate the tiles we want. private void layoutTiles() { if (mViewWidth == 0 || mViewHeight == 0 || !mLayoutTiles) { return; } mLayoutTiles = false; // The tile levels we want to keep as texture is in the range // [fromLevel, endLevel). int fromLevel; int endLevel; // We want to use a texture larger than or equal to the display size. mLevel = Utils.clamp(Utils.floorLog2(1f / mScale), 0, mLevelCount); // We want to keep one more tile level as texture in addition to what // we use for display. So it can be faster when the scale moves to the // next level. We choose the level closest to the current scale. if (mLevel != mLevelCount) { Rect range = mTileRange; getRange(range, mCenterX, mCenterY, mLevel, mScale, mRotation); mOffsetX = Math.round(mViewWidth / 2f + (range.left - mCenterX) * mScale); mOffsetY = Math.round(mViewHeight / 2f + (range.top - mCenterY) * mScale); fromLevel = mScale * (1 << mLevel) > 0.75f ? mLevel - 1 : mLevel; } else { // Activate the tiles of the smallest two levels. fromLevel = mLevel - 2; mOffsetX = Math.round(mViewWidth / 2f - mCenterX * mScale); mOffsetY = Math.round(mViewHeight / 2f - mCenterY * mScale); } fromLevel = Math.max(0, Math.min(fromLevel, mLevelCount - 2)); endLevel = Math.min(fromLevel + 2, mLevelCount); Rect range[] = mActiveRange; for (int i = fromLevel; i < endLevel; ++i) { getRange(range[i - fromLevel], mCenterX, mCenterY, i, mRotation); } // If rotation is transient, don't update the tile. if (mRotation % 90 != 0) { return; } synchronized (mQueueLock) { mDecodeQueue.clean(); mUploadQueue.clean(); mBackgroundTileUploaded = false; // Recycle unused tiles: if the level of the active tile is outside the // range [fromLevel, endLevel) or not in the visible range. int n = mActiveTiles.size(); for (int i = 0; i < n; i++) { Tile tile = mActiveTiles.valueAt(i); int level = tile.mTileLevel; if (level < fromLevel || level >= endLevel || !range[level - fromLevel].contains(tile.mX, tile.mY)) { mActiveTiles.removeAt(i); i--; n--; recycleTile(tile); } } } for (int i = fromLevel; i < endLevel; ++i) { int size = mTileSize << i; Rect r = range[i - fromLevel]; for (int y = r.top, bottom = r.bottom; y < bottom; y += size) { for (int x = r.left, right = r.right; x < right; x += size) { activateTile(x, y, i); } } } invalidate(); } private void invalidateTiles() { synchronized (mQueueLock) { mDecodeQueue.clean(); mUploadQueue.clean(); // TODO(xx): disable decoder int n = mActiveTiles.size(); for (int i = 0; i < n; i++) { Tile tile = mActiveTiles.valueAt(i); recycleTile(tile); } mActiveTiles.clear(); } } private void getRange(Rect out, int cX, int cY, int level, int rotation) { getRange(out, cX, cY, level, 1f / (1 << (level + 1)), rotation); } // If the bitmap is scaled by the given factor "scale", return the // rectangle containing visible range. The left-top coordinate returned is // aligned to the tile boundary. // // (cX, cY) is the point on the original bitmap which will be put in the // center of the ImageViewer. private void getRange(Rect out, int cX, int cY, int level, float scale, int rotation) { double radians = Math.toRadians(-rotation); double w = mViewWidth; double h = mViewHeight; double cos = Math.cos(radians); double sin = Math.sin(radians); int width = (int) Math.ceil(Math.max(Math.abs(cos * w - sin * h), Math.abs(cos * w + sin * h))); int height = (int) Math.ceil(Math.max(Math.abs(sin * w + cos * h), Math.abs(sin * w - cos * h))); int left = (int) Math.floor(cX - width / (2f * scale)); int top = (int) Math.floor(cY - height / (2f * scale)); int right = (int) Math.ceil(left + width / scale); int bottom = (int) Math.ceil(top + height / scale); // align the rectangle to tile boundary int size = mTileSize << level; left = Math.max(0, size * (left / size)); top = Math.max(0, size * (top / size)); right = Math.min(mImageWidth, right); bottom = Math.min(mImageHeight, bottom); out.set(left, top, right, bottom); } public void freeTextures() { mLayoutTiles = true; mTileDecoder.finishAndWait(); synchronized (mQueueLock) { mUploadQueue.clean(); mDecodeQueue.clean(); Tile tile = mRecycledQueue.pop(); while (tile != null) { tile.recycle(); tile = mRecycledQueue.pop(); } } int n = mActiveTiles.size(); for (int i = 0; i < n; i++) { Tile texture = mActiveTiles.valueAt(i); texture.recycle(); } mActiveTiles.clear(); mTileRange.set(0, 0, 0, 0); while (sTilePool.acquire() != null) { } } public boolean draw(GLCanvas canvas) { layoutTiles(); uploadTiles(canvas); mUploadQuota = UPLOAD_LIMIT; mRenderComplete = true; int level = mLevel; int rotation = mRotation; int flags = 0; if (rotation != 0) { flags |= GLCanvas.SAVE_FLAG_MATRIX; } if (flags != 0) { canvas.save(flags); if (rotation != 0) { int centerX = mViewWidth / 2, centerY = mViewHeight / 2; canvas.translate(centerX, centerY); canvas.rotate(rotation, 0, 0, 1); canvas.translate(-centerX, -centerY); } } try { if (level != mLevelCount) { int size = (mTileSize << level); float length = size * mScale; Rect r = mTileRange; for (int ty = r.top, i = 0; ty < r.bottom; ty += size, i++) { float y = mOffsetY + i * length; for (int tx = r.left, j = 0; tx < r.right; tx += size, j++) { float x = mOffsetX + j * length; drawTile(canvas, tx, ty, level, x, y, length); } } } else if (mPreview != null) { mPreview.draw(canvas, mOffsetX, mOffsetY, Math.round(mImageWidth * mScale), Math.round(mImageHeight * mScale)); } } finally { if (flags != 0) { canvas.restore(); } } if (mRenderComplete) { if (!mBackgroundTileUploaded) { uploadBackgroundTiles(canvas); } } else { invalidate(); } return mRenderComplete || mPreview != null; } private void uploadBackgroundTiles(GLCanvas canvas) { mBackgroundTileUploaded = true; int n = mActiveTiles.size(); for (int i = 0; i < n; i++) { Tile tile = mActiveTiles.valueAt(i); if (!tile.isContentValid()) { queueForDecode(tile); } } } private void queueForDecode(Tile tile) { synchronized (mQueueLock) { if (tile.mTileState == STATE_ACTIVATED) { tile.mTileState = STATE_IN_QUEUE; if (mDecodeQueue.push(tile)) { mQueueLock.notifyAll(); } } } } private void decodeTile(Tile tile) { synchronized (mQueueLock) { if (tile.mTileState != STATE_IN_QUEUE) { return; } tile.mTileState = STATE_DECODING; } boolean decodeComplete = tile.decode(); synchronized (mQueueLock) { if (tile.mTileState == STATE_RECYCLING) { tile.mTileState = STATE_RECYCLED; if (tile.mDecodedTile != null) { sTilePool.release(tile.mDecodedTile); tile.mDecodedTile = null; } mRecycledQueue.push(tile); return; } tile.mTileState = decodeComplete ? STATE_DECODED : STATE_DECODE_FAIL; if (!decodeComplete) { return; } mUploadQueue.push(tile); } invalidate(); } private Tile obtainTile(int x, int y, int level) { synchronized (mQueueLock) { Tile tile = mRecycledQueue.pop(); if (tile != null) { tile.mTileState = STATE_ACTIVATED; tile.update(x, y, level); return tile; } return new Tile(x, y, level); } } private void recycleTile(Tile tile) { synchronized (mQueueLock) { if (tile.mTileState == STATE_DECODING) { tile.mTileState = STATE_RECYCLING; return; } tile.mTileState = STATE_RECYCLED; if (tile.mDecodedTile != null) { sTilePool.release(tile.mDecodedTile); tile.mDecodedTile = null; } mRecycledQueue.push(tile); } } private void activateTile(int x, int y, int level) { long key = makeTileKey(x, y, level); Tile tile = mActiveTiles.get(key); if (tile != null) { if (tile.mTileState == STATE_IN_QUEUE) { tile.mTileState = STATE_ACTIVATED; } return; } tile = obtainTile(x, y, level); mActiveTiles.put(key, tile); } private Tile getTile(int x, int y, int level) { return mActiveTiles.get(makeTileKey(x, y, level)); } private static long makeTileKey(int x, int y, int level) { long result = x; result = (result << 16) | y; result = (result << 16) | level; return result; } private void uploadTiles(GLCanvas canvas) { int quota = UPLOAD_LIMIT; Tile tile = null; while (quota > 0) { synchronized (mQueueLock) { tile = mUploadQueue.pop(); } if (tile == null) { break; } if (!tile.isContentValid()) { if (tile.mTileState == STATE_DECODED) { tile.updateContent(canvas); --quota; } else { Log.w(TAG, "Tile in upload queue has invalid state: " + tile.mTileState); } } } if (tile != null) { invalidate(); } } // Draw the tile to a square at canvas that locates at (x, y) and // has a side length of length. private void drawTile(GLCanvas canvas, int tx, int ty, int level, float x, float y, float length) { RectF source = mSourceRect; RectF target = mTargetRect; target.set(x, y, x + length, y + length); source.set(0, 0, mTileSize, mTileSize); Tile tile = getTile(tx, ty, level); if (tile != null) { if (!tile.isContentValid()) { if (tile.mTileState == STATE_DECODED) { if (mUploadQuota > 0) { --mUploadQuota; tile.updateContent(canvas); } else { mRenderComplete = false; } } else if (tile.mTileState != STATE_DECODE_FAIL) { mRenderComplete = false; queueForDecode(tile); } } if (drawTile(tile, canvas, source, target)) { return; } } if (mPreview != null) { int size = mTileSize << level; float scaleX = (float) mPreview.getWidth() / mImageWidth; float scaleY = (float) mPreview.getHeight() / mImageHeight; source.set(tx * scaleX, ty * scaleY, (tx + size) * scaleX, (ty + size) * scaleY); canvas.drawTexture(mPreview, source, target); } } private boolean drawTile(Tile tile, GLCanvas canvas, RectF source, RectF target) { while (true) { if (tile.isContentValid()) { canvas.drawTexture(tile, source, target); return true; } // Parent can be divided to four quads and tile is one of the four. Tile parent = tile.getParentTile(); if (parent == null) { return false; } if (tile.mX == parent.mX) { source.left /= 2f; source.right /= 2f; } else { source.left = (mTileSize + source.left) / 2f; source.right = (mTileSize + source.right) / 2f; } if (tile.mY == parent.mY) { source.top /= 2f; source.bottom /= 2f; } else { source.top = (mTileSize + source.top) / 2f; source.bottom = (mTileSize + source.bottom) / 2f; } tile = parent; } } private class Tile extends UploadedTexture { public int mX; public int mY; public int mTileLevel; public Tile mNext; public Bitmap mDecodedTile; public volatile int mTileState = STATE_ACTIVATED; public Tile(int x, int y, int level) { mX = x; mY = y; mTileLevel = level; } @Override protected void onFreeBitmap(Bitmap bitmap) { sTilePool.release(bitmap); } boolean decode() { // Get a tile from the original image. The tile is down-scaled // by (1 << mTilelevel) from a region in the original image. try { Bitmap reuse = sTilePool.acquire(); if (reuse != null && reuse.getWidth() != mTileSize) { reuse = null; } mDecodedTile = mModel.getTile(mTileLevel, mX, mY, reuse); } catch (Throwable t) { Log.w(TAG, "fail to decode tile", t); } return mDecodedTile != null; } @Override protected Bitmap onGetBitmap() { Utils.assertTrue(mTileState == STATE_DECODED); // We need to override the width and height, so that we won't // draw beyond the boundaries. int rightEdge = ((mImageWidth - mX) >> mTileLevel); int bottomEdge = ((mImageHeight - mY) >> mTileLevel); setSize(Math.min(mTileSize, rightEdge), Math.min(mTileSize, bottomEdge)); Bitmap bitmap = mDecodedTile; mDecodedTile = null; mTileState = STATE_ACTIVATED; return bitmap; } // We override getTextureWidth() and getTextureHeight() here, so the // texture can be re-used for different tiles regardless of the actual // size of the tile (which may be small because it is a tile at the // boundary). @Override public int getTextureWidth() { return mTileSize; } @Override public int getTextureHeight() { return mTileSize; } public void update(int x, int y, int level) { mX = x; mY = y; mTileLevel = level; invalidateContent(); } public Tile getParentTile() { if (mTileLevel + 1 == mLevelCount) { return null; } int size = mTileSize << (mTileLevel + 1); int x = size * (mX / size); int y = size * (mY / size); return getTile(x, y, mTileLevel + 1); } @Override public String toString() { return String.format("tile(%s, %s, %s / %s)", mX / mTileSize, mY / mTileSize, mLevel, mLevelCount); } } private static class TileQueue { private Tile mHead; public Tile pop() { Tile tile = mHead; if (tile != null) { mHead = tile.mNext; } return tile; } public boolean push(Tile tile) { if (contains(tile)) { Log.w(TAG, "Attempting to add a tile already in the queue!"); return false; } boolean wasEmpty = mHead == null; tile.mNext = mHead; mHead = tile; return wasEmpty; } private boolean contains(Tile tile) { Tile other = mHead; while (other != null) { if (other == tile) { return true; } other = other.mNext; } return false; } public void clean() { mHead = null; } } private class TileDecoder extends Thread { public void finishAndWait() { interrupt(); try { join(); } catch (InterruptedException e) { Log.w(TAG, "Interrupted while waiting for TileDecoder thread to finish!"); } } private Tile waitForTile() throws InterruptedException { synchronized (mQueueLock) { while (true) { Tile tile = mDecodeQueue.pop(); if (tile != null) { return tile; } mQueueLock.wait(); } } } @Override public void run() { try { while (!isInterrupted()) { Tile tile = waitForTile(); decodeTile(tile); } } catch (InterruptedException ex) { // We were finished } } } }