| /* |
| * 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.ui; |
| |
| import com.android.gallery3d.common.Utils; |
| |
| import android.content.Context; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.graphics.Rect; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.nio.FloatBuffer; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import javax.microedition.khronos.opengles.GL11; |
| |
| // NinePatchTexture is a texture backed by a NinePatch resource. |
| // |
| // getPaddings() returns paddings specified in the NinePatch. |
| // getNinePatchChunk() returns the layout data specified in the NinePatch. |
| // |
| public class NinePatchTexture extends ResourceTexture { |
| @SuppressWarnings("unused") |
| private static final String TAG = "NinePatchTexture"; |
| private NinePatchChunk mChunk; |
| private MyCacheMap<Long, NinePatchInstance> mInstanceCache = |
| new MyCacheMap<Long, NinePatchInstance>(); |
| |
| public NinePatchTexture(Context context, int resId) { |
| super(context, resId); |
| } |
| |
| @Override |
| protected Bitmap onGetBitmap() { |
| if (mBitmap != null) return mBitmap; |
| |
| BitmapFactory.Options options = new BitmapFactory.Options(); |
| options.inPreferredConfig = Bitmap.Config.ARGB_8888; |
| Bitmap bitmap = BitmapFactory.decodeResource( |
| mContext.getResources(), mResId, options); |
| mBitmap = bitmap; |
| setSize(bitmap.getWidth(), bitmap.getHeight()); |
| byte[] chunkData = bitmap.getNinePatchChunk(); |
| mChunk = chunkData == null |
| ? null |
| : NinePatchChunk.deserialize(bitmap.getNinePatchChunk()); |
| if (mChunk == null) { |
| throw new RuntimeException("invalid nine-patch image: " + mResId); |
| } |
| return bitmap; |
| } |
| |
| public Rect getPaddings() { |
| // get the paddings from nine patch |
| if (mChunk == null) onGetBitmap(); |
| return mChunk.mPaddings; |
| } |
| |
| public NinePatchChunk getNinePatchChunk() { |
| if (mChunk == null) onGetBitmap(); |
| return mChunk; |
| } |
| |
| private static class MyCacheMap<K, V> extends LinkedHashMap<K, V> { |
| private int CACHE_SIZE = 16; |
| private V mJustRemoved; |
| |
| public MyCacheMap() { |
| super(4, 0.75f, true); |
| } |
| |
| @Override |
| protected boolean removeEldestEntry(Map.Entry<K, V> eldest) { |
| if (size() > CACHE_SIZE) { |
| mJustRemoved = eldest.getValue(); |
| return true; |
| } |
| return false; |
| } |
| |
| public V getJustRemoved() { |
| V result = mJustRemoved; |
| mJustRemoved = null; |
| return result; |
| } |
| } |
| |
| private NinePatchInstance findInstance(GLCanvas canvas, int w, int h) { |
| long key = w; |
| key = (key << 32) | h; |
| NinePatchInstance instance = mInstanceCache.get(key); |
| |
| if (instance == null) { |
| instance = new NinePatchInstance(this, w, h); |
| mInstanceCache.put(key, instance); |
| NinePatchInstance removed = mInstanceCache.getJustRemoved(); |
| if (removed != null) { |
| removed.recycle(canvas); |
| } |
| } |
| |
| return instance; |
| } |
| |
| @Override |
| public void draw(GLCanvas canvas, int x, int y, int w, int h) { |
| if (!isLoaded(canvas)) { |
| mInstanceCache.clear(); |
| } |
| |
| if (w != 0 && h != 0) { |
| findInstance(canvas, w, h).draw(canvas, this, x, y); |
| } |
| } |
| |
| @Override |
| public void recycle() { |
| super.recycle(); |
| GLCanvas canvas = mCanvasRef == null ? null : mCanvasRef.get(); |
| if (canvas == null) return; |
| for (NinePatchInstance instance : mInstanceCache.values()) { |
| instance.recycle(canvas); |
| } |
| mInstanceCache.clear(); |
| } |
| } |
| |
| // This keeps data for a specialization of NinePatchTexture with the size |
| // (width, height). We pre-compute the coordinates for efficiency. |
| class NinePatchInstance { |
| |
| @SuppressWarnings("unused") |
| private static final String TAG = "NinePatchInstance"; |
| |
| // We need 16 vertices for a normal nine-patch image (the 4x4 vertices) |
| private static final int VERTEX_BUFFER_SIZE = 16 * 2; |
| |
| // We need 22 indices for a normal nine-patch image, plus 2 for each |
| // transparent region. Current there are at most 1 transparent region. |
| private static final int INDEX_BUFFER_SIZE = 22 + 2; |
| |
| private FloatBuffer mXyBuffer; |
| private FloatBuffer mUvBuffer; |
| private ByteBuffer mIndexBuffer; |
| |
| // Names for buffer names: xy, uv, index. |
| private int[] mBufferNames; |
| |
| private int mIdxCount; |
| |
| public NinePatchInstance(NinePatchTexture tex, int width, int height) { |
| NinePatchChunk chunk = tex.getNinePatchChunk(); |
| |
| if (width <= 0 || height <= 0) { |
| throw new RuntimeException("invalid dimension"); |
| } |
| |
| // The code should be easily extended to handle the general cases by |
| // allocating more space for buffers. But let's just handle the only |
| // use case. |
| if (chunk.mDivX.length != 2 || chunk.mDivY.length != 2) { |
| throw new RuntimeException("unsupported nine patch"); |
| } |
| |
| float divX[] = new float[4]; |
| float divY[] = new float[4]; |
| float divU[] = new float[4]; |
| float divV[] = new float[4]; |
| |
| int nx = stretch(divX, divU, chunk.mDivX, tex.getWidth(), width); |
| int ny = stretch(divY, divV, chunk.mDivY, tex.getHeight(), height); |
| |
| prepareVertexData(divX, divY, divU, divV, nx, ny, chunk.mColor); |
| } |
| |
| /** |
| * Stretches the texture according to the nine-patch rules. It will |
| * linearly distribute the strechy parts defined in the nine-patch chunk to |
| * the target area. |
| * |
| * <pre> |
| * source |
| * /--------------^---------------\ |
| * u0 u1 u2 u3 u4 u5 |
| * div ---> |fffff|ssssssss|fff|ssssss|ffff| ---> u |
| * | div0 div1 div2 div3 | |
| * | | / / / / |
| * | | / / / / |
| * | | / / / / |
| * |fffff|ssss|fff|sss|ffff| ---> x |
| * x0 x1 x2 x3 x4 x5 |
| * \----------v------------/ |
| * target |
| * |
| * f: fixed segment |
| * s: stretchy segment |
| * </pre> |
| * |
| * @param div the stretch parts defined in nine-patch chunk |
| * @param source the length of the texture |
| * @param target the length on the drawing plan |
| * @param u output, the positions of these dividers in the texture |
| * coordinate |
| * @param x output, the corresponding position of these dividers on the |
| * drawing plan |
| * @return the number of these dividers. |
| */ |
| private static int stretch( |
| float x[], float u[], int div[], int source, int target) { |
| int textureSize = Utils.nextPowerOf2(source); |
| float textureBound = (float) source / textureSize; |
| |
| float stretch = 0; |
| for (int i = 0, n = div.length; i < n; i += 2) { |
| stretch += div[i + 1] - div[i]; |
| } |
| |
| float remaining = target - source + stretch; |
| |
| float lastX = 0; |
| float lastU = 0; |
| |
| x[0] = 0; |
| u[0] = 0; |
| for (int i = 0, n = div.length; i < n; i += 2) { |
| // Make the stretchy segment a little smaller to prevent sampling |
| // on neighboring fixed segments. |
| // fixed segment |
| x[i + 1] = lastX + (div[i] - lastU) + 0.5f; |
| u[i + 1] = Math.min((div[i] + 0.5f) / textureSize, textureBound); |
| |
| // stretchy segment |
| float partU = div[i + 1] - div[i]; |
| float partX = remaining * partU / stretch; |
| remaining -= partX; |
| stretch -= partU; |
| |
| lastX = x[i + 1] + partX; |
| lastU = div[i + 1]; |
| x[i + 2] = lastX - 0.5f; |
| u[i + 2] = Math.min((lastU - 0.5f)/ textureSize, textureBound); |
| } |
| // the last fixed segment |
| x[div.length + 1] = target; |
| u[div.length + 1] = textureBound; |
| |
| // remove segments with length 0. |
| int last = 0; |
| for (int i = 1, n = div.length + 2; i < n; ++i) { |
| if ((x[i] - x[last]) < 1f) continue; |
| x[++last] = x[i]; |
| u[last] = u[i]; |
| } |
| return last + 1; |
| } |
| |
| private void prepareVertexData(float x[], float y[], float u[], float v[], |
| int nx, int ny, int[] color) { |
| /* |
| * Given a 3x3 nine-patch image, the vertex order is defined as the |
| * following graph: |
| * |
| * (0) (1) (2) (3) |
| * | /| /| /| |
| * | / | / | / | |
| * (4) (5) (6) (7) |
| * | \ | \ | \ | |
| * | \| \| \| |
| * (8) (9) (A) (B) |
| * | /| /| /| |
| * | / | / | / | |
| * (C) (D) (E) (F) |
| * |
| * And we draw the triangle strip in the following index order: |
| * |
| * index: 04152637B6A5948C9DAEBF |
| */ |
| int pntCount = 0; |
| float xy[] = new float[VERTEX_BUFFER_SIZE]; |
| float uv[] = new float[VERTEX_BUFFER_SIZE]; |
| for (int j = 0; j < ny; ++j) { |
| for (int i = 0; i < nx; ++i) { |
| int xIndex = (pntCount++) << 1; |
| int yIndex = xIndex + 1; |
| xy[xIndex] = x[i]; |
| xy[yIndex] = y[j]; |
| uv[xIndex] = u[i]; |
| uv[yIndex] = v[j]; |
| } |
| } |
| |
| int idxCount = 1; |
| boolean isForward = false; |
| byte index[] = new byte[INDEX_BUFFER_SIZE]; |
| for (int row = 0; row < ny - 1; row++) { |
| --idxCount; |
| isForward = !isForward; |
| |
| int start, end, inc; |
| if (isForward) { |
| start = 0; |
| end = nx; |
| inc = 1; |
| } else { |
| start = nx - 1; |
| end = -1; |
| inc = -1; |
| } |
| |
| for (int col = start; col != end; col += inc) { |
| int k = row * nx + col; |
| if (col != start) { |
| int colorIdx = row * (nx - 1) + col; |
| if (isForward) colorIdx--; |
| if (color[colorIdx] == NinePatchChunk.TRANSPARENT_COLOR) { |
| index[idxCount] = index[idxCount - 1]; |
| ++idxCount; |
| index[idxCount++] = (byte) k; |
| } |
| } |
| |
| index[idxCount++] = (byte) k; |
| index[idxCount++] = (byte) (k + nx); |
| } |
| } |
| |
| mIdxCount = idxCount; |
| |
| int size = (pntCount * 2) * (Float.SIZE / Byte.SIZE); |
| mXyBuffer = allocateDirectNativeOrderBuffer(size).asFloatBuffer(); |
| mUvBuffer = allocateDirectNativeOrderBuffer(size).asFloatBuffer(); |
| mIndexBuffer = allocateDirectNativeOrderBuffer(mIdxCount); |
| |
| mXyBuffer.put(xy, 0, pntCount * 2).position(0); |
| mUvBuffer.put(uv, 0, pntCount * 2).position(0); |
| mIndexBuffer.put(index, 0, idxCount).position(0); |
| } |
| |
| private static ByteBuffer allocateDirectNativeOrderBuffer(int size) { |
| return ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder()); |
| } |
| |
| private void prepareBuffers(GLCanvas canvas) { |
| mBufferNames = new int[3]; |
| GL11 gl = canvas.getGLInstance(); |
| gl.glGenBuffers(3, mBufferNames, 0); |
| |
| gl.glBindBuffer(GL11.GL_ARRAY_BUFFER, mBufferNames[0]); |
| gl.glBufferData(GL11.GL_ARRAY_BUFFER, |
| mXyBuffer.capacity() * (Float.SIZE / Byte.SIZE), |
| mXyBuffer, GL11.GL_STATIC_DRAW); |
| |
| gl.glBindBuffer(GL11.GL_ARRAY_BUFFER, mBufferNames[1]); |
| gl.glBufferData(GL11.GL_ARRAY_BUFFER, |
| mUvBuffer.capacity() * (Float.SIZE / Byte.SIZE), |
| mUvBuffer, GL11.GL_STATIC_DRAW); |
| |
| gl.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, mBufferNames[2]); |
| gl.glBufferData(GL11.GL_ELEMENT_ARRAY_BUFFER, |
| mIndexBuffer.capacity(), |
| mIndexBuffer, GL11.GL_STATIC_DRAW); |
| |
| // These buffers are never used again. |
| mXyBuffer = null; |
| mUvBuffer = null; |
| mIndexBuffer = null; |
| } |
| |
| public void draw(GLCanvas canvas, NinePatchTexture tex, int x, int y) { |
| if (mBufferNames == null) { |
| prepareBuffers(canvas); |
| } |
| canvas.drawMesh(tex, x, y, mBufferNames[0], mBufferNames[1], |
| mBufferNames[2], mIdxCount); |
| } |
| |
| public void recycle(GLCanvas canvas) { |
| if (mBufferNames != null) { |
| canvas.deleteBuffer(mBufferNames[0]); |
| canvas.deleteBuffer(mBufferNames[1]); |
| canvas.deleteBuffer(mBufferNames[2]); |
| mBufferNames = null; |
| } |
| } |
| } |