RGBLuminanceSource class
This class is used to help decode images from files which arrive as RGB data from an ARGB pixel array. It does not support rotation.
@author dswitkin@google.com (Daniel Switkin) @author Betaminos
- Inheritance
-
- Object
- LuminanceSource
- RGBLuminanceSource
Constructors
-
RGBLuminanceSource(int width, int height, List<
int> pixels) - RGBLuminanceSource.orig(int width, int height, Uint8List _luminances)
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- height → int
-
Get the height of the bitmap.
no setterinherited
- isCropSupported → bool
-
Get whether this subclass supports cropping.
no setteroverride
- isRotateSupported → bool
-
Get whether this subclass supports counter-clockwise rotation.
no setterinherited
- matrix → Uint8List
-
Fetches luminance data for the underlying bitmap. Values should be fetched using:
{@code int luminance = array
y * width + x}no setteroverride - runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- width → int
-
Get the width of the bitmap.
no setterinherited
Methods
-
crop(
int left, int top, int width, int height) → LuminanceSource -
Returns a new object with cropped image data. Implementations may keep a reference to the
original data rather than a copy. Only callable if isCropSupported() is true.
override
-
getRow(
int y, Uint8List? row) → Uint8List -
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
matrix may never be called.
override
-
invert(
) → LuminanceSource -
Get a wrapper of this LuminanceSource which inverts the luminances it returns -- black becomes
white and vice versa, and each value becomes (255-value).
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
rotateCounterClockwise(
) → LuminanceSource -
Get a rotated version of this object.
inherited
-
rotateCounterClockwise45(
) → LuminanceSource -
Get a rotated version of this object.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
getLuminance(
int r, int g, int b) → int -
intList2Uint8List(
List< int> pixels) → Uint8List