GuiBitmapBuffer class

The GuiBitmapBuffer class provides an interface for creating custom 24-bit or 32-bit bitmaps and flutter image

Constructors

GuiBitmapBuffer.new({required int width, required int height, int bitsPerPixel = bitsPerPixelArgb})

Create a bitmap buffer with header prepopulated with necessary data. The actual image data must still be populated by the user.

Properties

bitsPerPixel → int

Number of bits per pixel (ie. 24 for 24-bit RGB pixel, 32 for for ARGB pixel w/ transparency)

final

bytesPerPixel → int

of bytes required to render a pixel (informational only)

no setter

hashCode → int

The hash code for this object.

no setter, inherited

headerOffset → int

Starting offset of Bitmap header

no setter

height → int

Height of bitmap image in pixels

final

imageData → Uint8List

Raw bitmap data

no setter

imageOffset → int

Starting offset of Bitmap data

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

width → int

The structure of a Bitmap Buffer is defined below: Reference Documentation: https://en.wikipedia.org/wiki/BMP_file_format bitmap file header : (14 bytes) WORD bfType; // 0-1 'B' 'M' DWORD bfSize; // 2-5 Size of File (headers + data) - little endian WORD bfReserved1; // 6-7 0 , 0 WORD bfReserved2; // 8-9 0 , 0 DWORD bfOffBits; // 10-13 54 bitmap info header : (40 bytes) DWORD biSize; // 14-17 40 LONG biWidth; // 18-21 width of image LONG biHeight; // 22-25 height of image WORD biPlanes; // 26-27 # of planes = 1 WORD biBitCount; // 28-29 # of bits per pixel DWORD biCompression; // 30-33 DWORD biSizeImage; // 34-37 size of bitmap image (# of pixels * bytes per pixel) LONG biXPelsPerMeter; // 38-41 the horizontal resolution of the image. (pixel per metre, signed integer) (200 dpi = 7874) LONG biYPelsPerMeter; // 42-45 the vertical resolution of the image. (pixel per metre, signed integer) (200 dpi = 7874) DWORD biClrUsed; // 46-49 the number of colors in the color palette, or 0 to default to 2n DWORD biClrImportant; // 50-53 the number of important colors used, or 0 when every color is important; generally ignored bitmap data : (size of bitmap image) BYTE bdData // ... data for image is ordered from bottom of image to top of image. Row N Row N-1 ... ... Row 2 Row 1 Width of bitmap image in pixels

final

Methods

imageRowOffset(int row) → int

Starting offset of Bitmap image for row row (zero-based)

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toImage() → Image

Convert Bitmap buffer into a Flutter Image widget.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

bitsPerPixelArgb → const int

Constant for 32-bit pixel w/ ARGB value

bitsPerPixelRgb → const int

Constant for 24-bit pixel w/ RGB value