com.googlecode.leptonica.android

Class Rotate

java.lang.Object

com.googlecode.leptonica.android.Rotate

public class Rotate
extends Object

Author:

alanv@google.com (Alan Viverette)

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	ROTATE_QUALITY Default rotation quality is high.

Constructor Summary

Constructors

Constructor and Description
Rotate()

Method Summary

Methods

Modifier and Type	Method and Description
static Pix	rotate(Pix pixs, float degrees) Performs rotation using the default parameters.
static Pix	rotate(Pix pixs, float degrees, boolean quality) Performs rotation with resizing using the default parameters.
static Pix	rotate(Pix pixs, float degrees, boolean quality, boolean resize) Performs basic image rotation about the center.

Methods inherited from class java.lang.Object

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

Field Detail

ROTATE_QUALITY

public static final boolean ROTATE_QUALITY

Default rotation quality is high.

See Also:

Constant Field Values

Constructor Detail

Rotate

public Rotate()

Method Detail

rotate

public static Pix rotate(Pix pixs,
         float degrees)

Performs rotation using the default parameters.

Parameters:

pixs - The source pix.

degrees - The number of degrees to rotate; clockwise is positive.

Returns:

the rotated source image

rotate

public static Pix rotate(Pix pixs,
         float degrees,
         boolean quality)

Performs rotation with resizing using the default parameters.

Parameters:

pixs - The source pix.

degrees - The number of degrees to rotate; clockwise is positive.

quality - Whether to use high-quality rotation.

Returns:

the rotated source image

rotate

public static Pix rotate(Pix pixs,
         float degrees,
         boolean quality,
         boolean resize)

Performs basic image rotation about the center.

Notes:

1. Rotation is about the center of the image.
2. For very small rotations, just return a clone.
3. Rotation brings either white or black pixels in from outside the image.
4. Above 20 degrees, if rotation by shear is requested, we rotate by sampling.
5. Colormaps are removed for rotation by area map and shear.
6. The dest can be expanded so that no image pixels are lost. To invoke expansion, input the original width and height. For repeated rotation, use of the original width and height allows the expansion to stop at the maximum required size, which is a square with side = sqrt(w*w + h*h).

Parameters:

pixs - The source pix.

degrees - The number of degrees to rotate; clockwise is positive.

quality - Whether to use high-quality rotation.

Whether - to expand the output so that no pixels are lost. Note: 1bpp images are always resized when quality is true.

Returns:

the rotated source image