public final class BitmapUtil {
/**
*取得指定区域的图形
* @param source
* @param x
* @param y
* @param width
* @param height
* @return
*/
public static Bitmap getBitmap(Bitmap source,int x,int y,int width,int height) {
Bitmap bitmap = Bitmap.createBitmap(source, x, y, width, height);
return bitmap;
}
/**
* 从大图中截取小图
* @param r
* @param resourseId
* @param row
* @param col
* @param rowTotal
* @param colTotal
* @return
*/
public static Bitmap getImage(Context context,Bitmap source,
int row,
int col,
int rowTotal,
int colTotal,
float multiple,
boolean isRecycle) {
Bitmap temp = getBitmap(source,
(col-1)*source.getWidth()/colTotal,
(row-1)*source.getHeight()/rowTotal,
source.getWidth()/colTotal,
source.getHeight()/rowTotal);
if(isRecycle) {
recycleBitmap(source);
}
if(multiple != 1.0) {
Matrix matrix = new Matrix();
matrix.postScale(multiple, multiple);
temp = Bitmap.createBitmap(temp, 0, 0,temp.getWidth(), temp.getHeight(), matrix, true);
}
return temp;
}
/**
* 从大图中截取小图
* @param r
* @param resourseId
* @param row
* @param col
* @param rowTotal
* @param colTotal
* @return
*/
public static Drawable getDrawableImage(Context context,Bitmap source,int row,int col,int rowTotal,int colTotal,float multiple) {
Bitmap temp = getBitmap(source, (col-1)*source.getWidth()/colTotal, (row-1)*source.getHeight()/rowTotal, source.getWidth()/colTotal, source.getHeight()/rowTotal);
if(multiple != 1.0) {
Matrix matrix = new Matrix();
matrix.postScale(multiple, multiple);
temp = Bitmap.createBitmap(temp, 0, 0,temp.getWidth(), temp.getHeight(), matrix, true);
}
Drawable d = new BitmapDrawable(context.getResources(),temp);
return d;
}
public static Drawable[] getDrawables(Context context,int resourseId,int row,int col,float multiple) {
Drawable drawables[] = new Drawable[row*col];
Bitmap source = decodeResource(context, resourseId);
int temp = 0;
for(int i=1; i<=row; i++) {
for(int j=1; j<=col; j++) {
drawables[temp] = getDrawableImage(context,source, i, j, row, col,multiple);
temp ++;
}
}
if(source != null && !source.isRecycled()) {
source.recycle();
source = null;
}
return drawables;
}
public static Drawable[] getDrawables(Context context,String resName,int row,int col,float multiple) {
Drawable drawables[] = new Drawable[row*col];
Bitmap source = decodeBitmapFromAssets(resName);
int temp = 0;
for(int i=1; i<=row; i++) {
for(int j=1; j<=col; j++) {
drawables[temp] = getDrawableImage(context,source, i, j, row, col,multiple);
temp ++;
}
}
if(source != null && !source.isRecycled()) {
source.recycle();
source = null;
}
return drawables;
}
/**
* 根据一张大图，返回切割后的图元数组
* @param resourseId:资源id
* @param row：总行数
* @param col：总列数
* multiple:图片缩放的倍数1:表示不变，2表示放大为原来的2倍
* @return
*/
public static Bitmap[] getBitmaps(Context context,int resourseId,int row,int col,float multiple) {
Bitmap bitmaps[] = new Bitmap[row*col];
Bitmap source = decodeResource(context, resourseId);
int temp = 0;
for(int i=1; i<=row; i++) {
for(int j=1; j<=col; j++) {
bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
temp ++;
}
}
if(source != null && !source.isRecycled()) {
source.recycle();
source = null;
}
return bitmaps;
}
public static Bitmap[] getBitmaps(Context context,String resName,int row,int col,float multiple) {
Bitmap bitmaps[] = new Bitmap[row*col];
Bitmap source = decodeBitmapFromAssets(resName);
int temp = 0;
for(int i=1; i<=row; i++) {
for(int j=1; j<=col; j++) {
bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
temp ++;
}
}
if(source != null && !source.isRecycled()) {
source.recycle();
source = null;
}
return bitmaps;
}
public static Bitmap[] getBitmapsByBitmap(Context context,Bitmap source,int row,int col,float multiple) {
Bitmap bitmaps[] = new Bitmap[row*col];
int temp = 0;
for(int i=1; i<=row; i++) {
for(int j=1; j<=col; j++) {
bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
temp ++;
}
}
return bitmaps;
}
public static Bitmap decodeResource(Context context,int resourseId) {
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inPreferredConfig = Bitmap.Config.ARGB_8888;
opt.inPurgeable = true;
opt.inInputShareable = true; //需把 inPurgeable设置为true，否则被忽略
//获取资源图片
InputStream is = context.getResources().openRawResource(resourseId);
return BitmapFactory.decodeStream(is,null,opt); //decodeStream直接调用JNI>>nativeDecodeAsset()来完成decode，无需再使用java层的createBitmap，从而节省了java层的空间
}
/**
* 从assets文件下解析图片
* @param resName
* @return
*/
public static Bitmap decodeBitmapFromAssets(String resName) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.inPurgeable = true;
options.inInputShareable = true;
InputStream in = null;
try {
//in = AssetsResourcesUtil.openResource(resName);
in =context.getAssets().open(resName);
} catch (IOException e) {
e.printStackTrace();
}
return BitmapFactory.decodeStream(in, null, options);
}
/**
* 回收不用的bitmap
* @param b
*/
public static void recycleBitmap(Bitmap b) {
if(b != null && !b.isRecycled()) {
b.recycle();
b = null;
}
}
/**
* 获取某些连在一起的图片的某一个画面（图片为横着排的情况）
* @param source
* @param frameIndex 从1开始
* @param totalCount
* @return
*/
public static Bitmap getOneFrameImg(Bitmap source, int frameIndex, int totalCount){
int singleW = source.getWidth() / totalCount;
return Bitmap.createBitmap(source,(frameIndex - 1) * singleW,0, singleW,source.getHeight());
}
public static void recycleBitmaps(Bitmap bitmaps[]) {
if(bitmaps != null){
for(Bitmap b:bitmaps) {
recycleBitmap(b);
}
bitmaps = null;
}
}
/**
* drawable转换成bitmap
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
if(drawable instanceof BitmapDrawable) {
return ((BitmapDrawable)drawable).getBitmap();
}else if(drawable instanceof NinePatchDrawable) {
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE
? Bitmap.Config.ARGB_8888 : Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}else {
throw new IllegalArgumentException("can not support this drawable to bitmap now!!!");
}
}