TLuminanceSource Class
Definition
The purpose of this class hierarchy is to abstract different bitmap implementations across platforms into a standard interface for requesting greyscale luminance values. The interface only provides immutable methods; therefore crop and rotation create copies. This is to ensure that one Reader does not modify the original luminance source and leave it in an unknown state for other Readers in the chain.
type TLuminanceSource = class(TObject)- Inheritance
-
TObjectTLuminanceSource
- Derived
Constructors
Properties
Methods
| CropSupported | |
| InversionSupported | |
| Matrix |
Fetches luminance data for the underlying bitmap. Values should be fetched using:
none
|
| RotateSupported | |
| ToString | |
| crop(Integer, Integer, Integer, Integer) |
Returns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if CropSupported is true. |
| getRow(Integer, TArray<Byte>) |
Fetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have to bitwise and with 0xff for each value. It is preferable for implementations of this method to only fetch this row rather than the whole image, since no 2D Readers may be installed and getMatrix() may never be called. |
| invert | |
| rotateCounterClockwise |
Returns a new object with rotated image data by 90 degrees counterclockwise. Only callable if RotateSupported is true. |
| rotateCounterClockwise45 |
Returns a new object with rotated image data by 45 degrees counterclockwise. Only callable if RotateSupported is true. |