com.tinchoapps.devutils

Class BitmapUtils

java.lang.Object

com.tinchoapps.devutils.BitmapUtils

public final class BitmapUtils
extends java.lang.Object

Copied from Android OpenSource Project, and added some extra methods

Field Summary

Fields

Modifier and Type	Field and Description
static int	UNCONSTRAINED

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	compressToBytes(android.graphics.Bitmap bitmap)
static byte[]	compressToBytes(android.graphics.Bitmap bitmap, int quality)
static int	computeSampleSize(float scale)
static int	computeSampleSize(int width, int height, int minSideLength, int maxNumOfPixels) Compute the sample size as a function of minSideLength and maxNumOfPixels.
static int	computeSampleSizeLarger(float scale)
static int	computeSampleSizeLarger(int w, int h, int minSideLength)
static java.io.File	copyBitmapToDestination(android.content.Context context, android.net.Uri uri, int maxWidth, int maxHeight, java.io.File destinationFile, boolean fixRotation)
static android.graphics.Bitmap	createVideoThumbnail(java.lang.String filePath)
static boolean	isRotationSupported(java.lang.String mimeType)
static boolean	isSupportedByRegionDecoder(java.lang.String mimeType)
static int	nextPowerOf2(int n) Returns the next power of two.
static int	prevPowerOf2(int n) Returns the previous power of two.
static void	recycleSilently(android.graphics.Bitmap bitmap)
static android.graphics.Bitmap	resizeAndCropCenter(android.graphics.Bitmap bitmap, int size, boolean recycle)
static android.graphics.Bitmap	resizeBitmapByScale(android.graphics.Bitmap bitmap, float scale, boolean recycle)
static android.graphics.Bitmap	resizeDownBySideLength(android.graphics.Bitmap bitmap, int maxLength, boolean recycle)
static android.graphics.Bitmap	rotateBitmap(android.graphics.Bitmap source, int rotation, boolean recycle)
static java.io.File	saveToFile(android.graphics.Bitmap bitmap, java.lang.String savePath, android.graphics.Bitmap.CompressFormat format, int quality, boolean recycle)
static android.graphics.Bitmap	transformBitmap(android.graphics.Bitmap source, android.graphics.Matrix matrix, boolean recycle)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UNCONSTRAINED

public static final int UNCONSTRAINED

See Also:

Constant Field Values

Method Detail

computeSampleSize

public static int computeSampleSize(int width,
                    int height,
                    int minSideLength,
                    int maxNumOfPixels)

Compute the sample size as a function of minSideLength and maxNumOfPixels. minSideLength is used to specify that minimal width or height of a bitmap. maxNumOfPixels is used to specify the maximal size in pixels that is tolerable in terms of memory usage.

The function returns a sample size based on the constraints. Both size and minSideLength can be passed in as UNCONSTRAINED, which indicates no care of the corresponding constraint. The functions prefers returning a sample size that generates a smaller bitmap, unless minSideLength = UNCONSTRAINED.

Also, the function rounds up the sample size to a power of 2 or multiple of 8 because BitmapFactory only honors sample size this way. For example, BitmapFactory downsamples an image by 2 even though the request is 3. So we round up the sample size to avoid OOM.

computeSampleSizeLarger

public static int computeSampleSizeLarger(int w,
                          int h,
                          int minSideLength)

computeSampleSizeLarger

public static int computeSampleSizeLarger(float scale)

computeSampleSize

public static int computeSampleSize(float scale)

resizeBitmapByScale

public static android.graphics.Bitmap resizeBitmapByScale(android.graphics.Bitmap bitmap,
                                          float scale,
                                          boolean recycle)

resizeDownBySideLength

public static android.graphics.Bitmap resizeDownBySideLength(android.graphics.Bitmap bitmap,
                                             int maxLength,
                                             boolean recycle)

resizeAndCropCenter

public static android.graphics.Bitmap resizeAndCropCenter(android.graphics.Bitmap bitmap,
                                          int size,
                                          boolean recycle)

recycleSilently

public static void recycleSilently(android.graphics.Bitmap bitmap)

rotateBitmap

public static android.graphics.Bitmap rotateBitmap(android.graphics.Bitmap source,
                                   int rotation,
                                   boolean recycle)

transformBitmap

public static android.graphics.Bitmap transformBitmap(android.graphics.Bitmap source,
                                      android.graphics.Matrix matrix,
                                      boolean recycle)

createVideoThumbnail

public static android.graphics.Bitmap createVideoThumbnail(java.lang.String filePath)

compressToBytes

public static byte[] compressToBytes(android.graphics.Bitmap bitmap)

compressToBytes

public static byte[] compressToBytes(android.graphics.Bitmap bitmap,
                     int quality)

isSupportedByRegionDecoder

public static boolean isSupportedByRegionDecoder(java.lang.String mimeType)

isRotationSupported

public static boolean isRotationSupported(java.lang.String mimeType)

saveToFile

public static java.io.File saveToFile(android.graphics.Bitmap bitmap,
                      java.lang.String savePath,
                      android.graphics.Bitmap.CompressFormat format,
                      int quality,
                      boolean recycle)

copyBitmapToDestination

public static java.io.File copyBitmapToDestination(android.content.Context context,
                                   android.net.Uri uri,
                                   int maxWidth,
                                   int maxHeight,
                                   java.io.File destinationFile,
                                   boolean fixRotation)
                                            throws java.io.IOException,
                                                   java.lang.OutOfMemoryError

Throws:

java.io.IOException

java.lang.OutOfMemoryError

nextPowerOf2

public static int nextPowerOf2(int n)

Returns the next power of two. Returns the input if it is already power of 2. Throws IllegalArgumentException if the input is <= 0 or the answer overflows.

prevPowerOf2

public static int prevPowerOf2(int n)

Returns the previous power of two. Returns the input if it is already power of 2. Throws IllegalArgumentException if the input is <= 0