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Diffstat (limited to '')
-rw-r--r-- | src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java new file mode 100644 index 00000000..07e41dcb --- /dev/null +++ b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java @@ -0,0 +1,314 @@ +package de.thedevstack.conversationsplus.utils; + +import android.graphics.Bitmap; +import android.graphics.BitmapFactory; +import android.graphics.Canvas; +import android.graphics.Matrix; +import android.graphics.RectF; +import android.media.ExifInterface; +import android.net.Uri; +import android.util.Log; +import android.util.LruCache; + +import java.io.File; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.io.InputStream; + +import eu.siacs.conversations.entities.Message; +import eu.siacs.conversations.persistance.FileBackend; +import eu.siacs.conversations.utils.ExifHelper; + +/** + * This util provides + */ +public final class ImageUtil { + private static LruCache<String, Bitmap> BITMAP_CACHE; + + /** + * Returns a bitmap from the cache. + * @see LruCache#get(Object) for details + * @param key the key of the bitmap to get + * @return the bitmap + */ + public static Bitmap getBitmapFromCache(String key) { + return BITMAP_CACHE.get(key); + } + + /** + * Adds a bitmap with the given key to the cache. + * @see LruCache#put(Object, Object) for details + * @param key the key to identify this bitmap + * @param bitmap the bitmap to cache + */ + public static void addBitmapToCache(String key, Bitmap bitmap) { + BITMAP_CACHE.put(key, bitmap); + } + + /** + * Removes the bitmap with given key from the cache. + * @param key the key of the bitmap to remove + */ + public static void removeBitmapFromCache(String key) { + BITMAP_CACHE.remove(key); + } + + /** + * Clears the cache. + * @see LruCache#evictAll() for more details. + */ + public static void evictBitmapCache() { + BITMAP_CACHE.evictAll(); + } + + /** + * Initializes the bitmap cache. + * This has to be executed once on application start. + * @see LruCache#LruCache(int) for details + */ + public static void initBitmapCache() { + Log.i("Conversations+ImageUtil", "Initializing BitmapCache"); + final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024); + final int cacheSize = maxMemory / 8; + BITMAP_CACHE = new LruCache<String, Bitmap>(cacheSize) { + @Override + protected int sizeOf(final String key, final Bitmap bitmap) { + return bitmap.getByteCount() / 1024; + } + }; + } + + /** + * Resizes a given bitmap and return a new and resized bitmap. + * The bitmap is only resized if either the width or the height of the original bitmap is smaller than the given size. + * @param originalBitmap the bitmap to resize + * @param size the size to scale to + * @return new and resized bitmap or the original bitmap if width and height are smaller than size + */ + public static Bitmap resize(Bitmap originalBitmap, int size) { + int w = originalBitmap.getWidth(); + int h = originalBitmap.getHeight(); + if (Math.max(w, h) > size) { + int scalledW; + int scalledH; + if (w <= h) { + scalledW = (int) (w / ((double) h / size)); + scalledH = size; + } else { + scalledW = size; + scalledH = (int) (h / ((double) w / size)); + } + return Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true); + } else { + return originalBitmap; + } + } + + /** + * Returns the rotation from the exif information of an image identified with the given uri. + * The orientation is retrieved by parsing the stream of the image. + * FileNotFoundException is silently ignored. + * @param image the uri of the image to get the rotation + * @return the rotation value for the image, <code>0</code> if the file cannot be found. + */ + public static int getRotation(Uri image) { + InputStream is = null; + try { + is = StreamUtil.openInputStreamFromContentResolver(image); + return ExifHelper.getOrientation(is); + } catch (FileNotFoundException e) { + return 0; + } finally { + StreamUtil.close(is); + } + } + + /** + * Returns a thumbnail for a bitmap in a message. + * @param message the message to get the thumbnail for + * @param size the size to resize the original image to + * @param cacheOnly whether only cached images should be returned or not + * @return the resized thumbail + * @throws FileNotFoundException if the original image does not exist anymore or an IOException occurs. + */ + public static Bitmap getThumbnail(Message message, int size, boolean cacheOnly) + throws FileNotFoundException { + Bitmap thumbnail = ImageUtil.getBitmapFromCache(message.getUuid()); + if ((thumbnail == null) && (!cacheOnly)) { + File file = FileBackend.getFile(message); + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inSampleSize = calcSampleSize(file, size); + Bitmap fullsize = BitmapFactory.decodeFile(file.getAbsolutePath(),options); + if (fullsize == null) { + throw new FileNotFoundException(); + } + thumbnail = resize(fullsize, size); + thumbnail = rotate(thumbnail, file.getAbsolutePath()); + + ImageUtil.addBitmapToCache(message.getUuid(), thumbnail); + } + return thumbnail; + } + + /** + * Rotates an bitmap. Only the values 90°, 180° and 270° are considered to rotate the image. + * The orientation information is read using the ExifInterface. + * @param original the original bitmap + * @param srcPath the path to the original bitmap (used to read the exif information) + * @return rotated bitmap, or original bitmap if criteria are not met + * @throws IOException + */ + public static Bitmap rotate(Bitmap original, String srcPath) { + try { + ExifInterface exif = new ExifInterface(srcPath); + int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED); + int rotation = 0; + switch (orientation) { + case ExifInterface.ORIENTATION_ROTATE_90: + rotation = 90; + break; + case ExifInterface.ORIENTATION_ROTATE_180: + rotation = 180; + break; + case ExifInterface.ORIENTATION_ROTATE_270: + rotation = 270; + break; + } + if (rotation > 0) { + return rotate(original, rotation); + } + } catch (IOException e) { + Log.w("filebackend", "Error while rotating image, returning original (" + e.getMessage() + ")"); + } + return original; + } + + /** + * Rotates a bitmap with given degrees. + * @param bitmap the bitmap to be rotated + * @param degree the degrees to rotate the bitmap + * @return a newly created bitmap + */ + public static Bitmap rotate(Bitmap bitmap, int degree) { + int w = bitmap.getWidth(); + int h = bitmap.getHeight(); + Matrix mtx = new Matrix(); + mtx.postRotate(degree); + return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true); + } + + + public static Bitmap cropCenterSquare(Uri image, int size) { + if (image == null) { + return null; + } + InputStream is = null; + try { + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inSampleSize = calcSampleSize(image, size); + is = StreamUtil.openInputStreamFromContentResolver(image); + Bitmap input = BitmapFactory.decodeStream(is, null, options); + if (input == null) { + return null; + } else { + int rotation = getRotation(image); + if (rotation > 0) { + input = rotate(input, rotation); + } + return cropCenterSquare(input, size); + } + } catch (FileNotFoundException e) { + return null; + } finally { + StreamUtil.close(is); + } + } + + public static Bitmap cropCenter(Uri image, int newHeight, int newWidth) { + if (image == null) { + return null; + } + InputStream is = null; + try { + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inSampleSize = calcSampleSize(image,Math.max(newHeight, newWidth)); + is = StreamUtil.openInputStreamFromContentResolver(image); + Bitmap source = BitmapFactory.decodeStream(is, null, options); + if (source == null) { + return null; + } + int sourceWidth = source.getWidth(); + int sourceHeight = source.getHeight(); + float xScale = (float) newWidth / sourceWidth; + float yScale = (float) newHeight / sourceHeight; + float scale = Math.max(xScale, yScale); + float scaledWidth = scale * sourceWidth; + float scaledHeight = scale * sourceHeight; + float left = (newWidth - scaledWidth) / 2; + float top = (newHeight - scaledHeight) / 2; + + RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight); + Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888); + Canvas canvas = new Canvas(dest); + canvas.drawBitmap(source, null, targetRect, null); + return dest; + } catch (FileNotFoundException e) { + return null; + } finally { + StreamUtil.close(is); + } + } + + public static Bitmap cropCenterSquare(Bitmap input, int size) { + int w = input.getWidth(); + int h = input.getHeight(); + + float scale = Math.max((float) size / h, (float) size / w); + + float outWidth = scale * w; + float outHeight = scale * h; + float left = (size - outWidth) / 2; + float top = (size - outHeight) / 2; + RectF target = new RectF(left, top, left + outWidth, top + outHeight); + + Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); + Canvas canvas = new Canvas(output); + canvas.drawBitmap(input, null, target, null); + return output; + } + + public static int calcSampleSize(Uri image, int size) throws FileNotFoundException { + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inJustDecodeBounds = true; + BitmapFactory.decodeStream(StreamUtil.openInputStreamFromContentResolver(image), null, options); + return calcSampleSize(options, size); + } + + public static int calcSampleSize(File image, int size) { + BitmapFactory.Options options = new BitmapFactory.Options(); + options.inJustDecodeBounds = true; + BitmapFactory.decodeFile(image.getAbsolutePath(), options); + return calcSampleSize(options, size); + } + + public static int calcSampleSize(BitmapFactory.Options options, int size) { + int height = options.outHeight; + int width = options.outWidth; + int inSampleSize = 1; + + if (height > size || width > size) { + int halfHeight = height / 2; + int halfWidth = width / 2; + + while ((halfHeight / inSampleSize) > size + && (halfWidth / inSampleSize) > size) { + inSampleSize *= 2; + } + } + return inSampleSize; + } + + private ImageUtil() { + // Static helper class + } +} |