libgdx gif工具类

package gdx.utils; /** * Copyright (c) 2013 Xcellent Creations, Inc. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.BufferUnderflowException; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.util.ArrayList; import com.badlogic.gdx.graphics.Color; import com.badlogic.gdx.graphics.Pixmap; import com.badlogic.gdx.graphics.Pixmap.Format; import com.badlogic.gdx.graphics.Texture.TextureFilter; import com.badlogic.gdx.graphics.Texture; import com.badlogic.gdx.graphics.g2d.Animation.PlayMode; import com.badlogic.gdx.graphics.g2d.TextureRegion; import com.badlogic.gdx.utils.Array; import com.badlogic.gdx.utils.Logger; /** * Reads frame data from a GIF image source and decodes it into individual frames * for animation purposes. Image data can be read from either and InputStream source * or a byte[]. * * This class is optimized for running animations with the frames, there * are no methods to get individual frame images, only to decode the next frame in the * animation sequence. Instead, it lowers its memory footprint by only housing the minimum * data necessary to decode the next frame in the animation sequence. * * The animation must be manually moved forward using {@link #advance()} before requesting the next * frame. This method must also be called before you request the first frame or an error will * occur. * * Implementation adapted from sample code published in Lyons. (2004). <em>Java for Programmers</em>, * republished under the MIT Open Source License */ public class GifDecoderOptimized { private static final String TAG = GifDecoderOptimized.class.getSimpleName(); /** * File read status: No errors. */ public static final int STATUS_OK = 0; /** * File read status: Error decoding file (may be partially decoded) */ public static final int STATUS_FORMAT_ERROR = 1; /** * File read status: Unable to open source. */ public static final int STATUS_OPEN_ERROR = 2; /** * max decoder pixel stack size */ protected static final int MAX_STACK_SIZE = 4096; /** * GIF Disposal Method meaning take no action */ private static final int DISPOSAL_UNSPECIFIED = 0; /** * GIF Disposal Method meaning leave canvas from previous frame */ private static final int DISPOSAL_NONE = 1; /** * GIF Disposal Method meaning clear canvas to background color */ private static final int DISPOSAL_BACKGROUND = 2; /** * GIF Disposal Method meaning clear canvas to frame before last */ private static final int DISPOSAL_PREVIOUS = 3; /** * Global status code of GIF data parsing */ protected int status; //Global File Header values and parsing flags protected int width; // full image width protected int height; // full image height protected boolean gctFlag; // global color table used protected int gctSize; // size of global color table protected int loopCount = 1; // iterations; 0 = repeat forever protected int[] gct; // global color table protected int[] act; // active color table protected int bgIndex; // background color index protected int bgColor; // background color protected int pixelAspect; // pixel aspect ratio protected boolean lctFlag; // local color table flag protected int lctSize; // local color table size // Raw GIF data from input source protected ByteBuffer rawData; // Raw data read working array protected byte[] block = new byte[256]; // current data block protected int blockSize = 0; // block size last graphic control extension info // LZW decoder working arrays protected short[] prefix; protected byte[] suffix; protected byte[] pixelStack; protected byte[] mainPixels; protected int[] mainScratch, copyScratch; protected ArrayList<GifFrame> frames; // frames read from current file protected GifFrame currentFrame; protected DixieMap previousImage, currentImage, renderImage; protected int framePointer; protected int frameCount; private Logger log; /** * Inner model class housing metadata for each frame */ private static class GifFrame { public int ix, iy, iw, ih; /* Control Flags */ public boolean interlace; public boolean transparency; /* Disposal Method */ public int dispose; /* Transparency Index */ public int transIndex; /* Delay, in ms, to next frame */ public int delay; /* Index in the raw buffer where we need to start reading to decode */ public int bufferFrameStart; /* Local Color Table */ public int[] lct; } private static class DixieMap extends Pixmap { DixieMap(int w, int h, Pixmap.Format f) { super(w, h, f); } @Override public void dispose() { // TODO Auto-generated method stub super.dispose(); } DixieMap(int[] data, int w, int h, Pixmap.Format f) { super(w, h, f); int x, y; for(y = 0; y < h; y++) { for(x = 0; x < w; x++) { int pxl_ARGB8888 = data[x + y * w]; int pxl_RGBA8888 = ((pxl_ARGB8888 >> 24) & 0x000000ff) | ((pxl_ARGB8888 << 8) & 0xffffff00); // convert ARGB8888 > RGBA8888 drawPixel(x, y, pxl_RGBA8888); } } } void setPixels(int[] pixels, int offset, int stride, int x, int y, int width, int height) { ByteBuffer bb = getPixels(); int k, l; for(y = 0; y < height; y++) { for(x = 0; x < width; x++) { int pxl_ARGB8888 = pixels[x + y * width]; int pxl_RGBA8888 = ((pxl_ARGB8888 >> 24) & 0x000000ff) | ((pxl_ARGB8888 << 8) & 0xffffff00); // convert ARGB8888 > RGBA8888 drawPixel(x, y, pxl_RGBA8888); } } } void getPixels(int[] pixels, int offset, int stride, int x, int y, int width, int height) { java.nio.ByteBuffer bb = getPixels(); int k, l; for(k = y; k < y + height; k++) { int _offset = offset; for(l = x; l < x + width; l++) { int pxl = bb.getInt(4 * (l + k * width)); // convert RGBA8888 > ARGB8888