com.bumptech.glide.load.resource.bitmap

Class TransformationUtils

java.lang.Object

com.bumptech.glide.load.resource.bitmap.TransformationUtils

public final class TransformationUtils
extends Object

A class with methods to efficiently resize Bitmaps.

Field Summary

Fields

Modifier and Type	Field and Description
static int	PAINT_FLAGS

Method Summary

Modifier and Type	Method and Description
static Bitmap	centerCrop(BitmapPool pool, Bitmap inBitmap, int width, int height) A potentially expensive operation to crop the given Bitmap so that it fills the given dimensions.
static Bitmap	centerInside(BitmapPool pool, Bitmap inBitmap, int width, int height) If the Bitmap is smaller or equal to the Target it returns the original size, if not then fitCenter(BitmapPool, Bitmap, int, int) is called instead.
static Bitmap	circleCrop(BitmapPool pool, Bitmap inBitmap, int destWidth, int destHeight) Crop the image to a circle and resize to the specified width/height.
static Bitmap	fitCenter(BitmapPool pool, Bitmap inBitmap, int width, int height) An expensive operation to resize the given Bitmap down so that it fits within the given dimensions maintain the original proportions.
static Lock	getBitmapDrawableLock()
static int	getExifOrientationDegrees(int exifOrientation) Get the # of degrees an image must be rotated to match the given exif orientation.
static boolean	isExifOrientationRequired(int exifOrientation) Returns true if the given exif orientation indicates that a transformation is necessary and false otherwise.
static Bitmap	rotateImage(Bitmap imageToOrient, int degreesToRotate) This is an expensive operation that copies the image in place with the pixels rotated.
static Bitmap	rotateImageExif(BitmapPool pool, Bitmap inBitmap, int exifOrientation) Rotate and/or flip the image to match the given exif orientation.
static Bitmap	roundedCorners(BitmapPool pool, Bitmap inBitmap, int width, int height, int roundingRadius) Creates a bitmap from a source bitmap and rounds the corners.
static void	setAlpha(Bitmap inBitmap, Bitmap outBitmap) Sets the alpha of the Bitmap we're going to re-use to the alpha of the Bitmap we're going to transform.

Methods inherited from class java.lang.Object

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

Field Detail

PAINT_FLAGS

public static final int PAINT_FLAGS

See Also:

Constant Field Values

Method Detail

getBitmapDrawableLock

public static Lock getBitmapDrawableLock()

centerCrop

public static Bitmap centerCrop(@NonNull
                                BitmapPool pool,
                                @NonNull
                                Bitmap inBitmap,
                                int width,
                                int height)

A potentially expensive operation to crop the given Bitmap so that it fills the given dimensions. This operation is significantly less expensive in terms of memory if a mutable Bitmap with the given dimensions is passed in as well.

Parameters:

pool - The BitmapPool to obtain a bitmap from.

inBitmap - The Bitmap to resize.

width - The width in pixels of the final Bitmap.

height - The height in pixels of the final Bitmap.

Returns:

The resized Bitmap (will be recycled if recycled is not null).

fitCenter

public static Bitmap fitCenter(@NonNull
                               BitmapPool pool,
                               @NonNull
                               Bitmap inBitmap,
                               int width,
                               int height)

An expensive operation to resize the given Bitmap down so that it fits within the given dimensions maintain the original proportions.

Parameters:

pool - The BitmapPool obtain a bitmap from.

inBitmap - The Bitmap to shrink.

width - The width in pixels the final image will fit within.

height - The height in pixels the final image will fit within.

Returns:

A new Bitmap shrunk to fit within the given dimensions, or toFit if toFit's width or height matches the given dimensions and toFit fits within the given dimensions

centerInside

public static Bitmap centerInside(@NonNull
                                  BitmapPool pool,
                                  @NonNull
                                  Bitmap inBitmap,
                                  int width,
                                  int height)

If the Bitmap is smaller or equal to the Target it returns the original size, if not then fitCenter(BitmapPool, Bitmap, int, int) is called instead.

Parameters:

pool - The BitmapPool obtain a bitmap from.

inBitmap - The Bitmap to center.

width - The width in pixels of the target.

height - The height in pixels of the target.

Returns:

returns input Bitmap if smaller or equal to target, or toFit if the Bitmap's width or height is larger than the given dimensions

setAlpha

public static void setAlpha(Bitmap inBitmap,
                            Bitmap outBitmap)

Sets the alpha of the Bitmap we're going to re-use to the alpha of the Bitmap we're going to transform. This keeps Bitmap.hasAlpha()} consistent before and after the transformation for transformations that don't add or remove transparent pixels.

Parameters:

inBitmap - The Bitmap that will be transformed.

outBitmap - The Bitmap that will be returned from the transformation.

rotateImage

public static Bitmap rotateImage(@NonNull
                                 Bitmap imageToOrient,
                                 int degreesToRotate)

This is an expensive operation that copies the image in place with the pixels rotated. If possible rather use getOrientationMatrix, and put that as the imageMatrix on an ImageView.

Parameters:

imageToOrient - Image Bitmap to orient.

degreesToRotate - number of degrees to rotate the image by. If zero the original image is returned unmodified.

Returns:

The oriented bitmap. May be the imageToOrient without modification, or a new Bitmap.

getExifOrientationDegrees

public static int getExifOrientationDegrees(int exifOrientation)

Get the # of degrees an image must be rotated to match the given exif orientation.

Parameters:

exifOrientation - The exif orientation [1-8]

Returns:

the number of degrees to rotate

rotateImageExif

public static Bitmap rotateImageExif(@NonNull
                                     BitmapPool pool,
                                     @NonNull
                                     Bitmap inBitmap,
                                     int exifOrientation)

Rotate and/or flip the image to match the given exif orientation.

Parameters:

pool - A pool that may or may not contain an image of the necessary dimensions.

inBitmap - The bitmap to rotate/flip.

exifOrientation - the exif orientation [1-8].

Returns:

The rotated and/or flipped image or toOrient if no rotation or flip was necessary.

isExifOrientationRequired

public static boolean isExifOrientationRequired(int exifOrientation)

Returns true if the given exif orientation indicates that a transformation is necessary and false otherwise.

circleCrop

public static Bitmap circleCrop(@NonNull
                                BitmapPool pool,
                                @NonNull
                                Bitmap inBitmap,
                                int destWidth,
                                int destHeight)

Crop the image to a circle and resize to the specified width/height. The circle crop will have the same width and height equal to the min-edge of the result image.

Parameters:

pool - The BitmapPool obtain a bitmap from.

inBitmap - The Bitmap to resize.

destWidth - The width in pixels of the final Bitmap.

destHeight - The height in pixels of the final Bitmap.

Returns:

The resized Bitmap (will be recycled if recycled is not null).

roundedCorners

public static Bitmap roundedCorners(@NonNull
                                    BitmapPool pool,
                                    @NonNull
                                    Bitmap inBitmap,
                                    int width,
                                    int height,
                                    int roundingRadius)

Creates a bitmap from a source bitmap and rounds the corners.

Parameters:

inBitmap - the source bitmap to use as a basis for the created bitmap.

width - the width of the generated bitmap.

height - the height of the generated bitmap.

roundingRadius - the corner radius to be applied (in device-specific pixels).

Returns:

a Bitmap similar to inBitmap but with rounded corners.

Throws:

IllegalArgumentException - if roundingRadius, width or height is 0 or less.