TCustomBitmap

type TCustomBitmap = class(TRasterImage)

protected

  procedure MaskHandleNeeded; override;

MaskHandleNeeded - method to signal that a handle is required for the Mask

  procedure PaletteNeeded; override;

PaletteNeeded - method to signal that a Palette is required

  function CanShareImage(); override;

CanShareImage - returns True if specified class of image can be shared

  procedure Changed(); override;

Changed - method to call when properties have changed

  function CreateDefaultBitmapHandle(); override;

CreateDefaultBitmapHandle - returns a bitmap handle matching the description ADesc

  procedure FreeMaskHandle;

FreeMaskHandle - method to release Mask handle

  function GetBitmapHandle; override;

GetBitmapHandle - returns a Birmap Handle for the Image

  function GetMaskHandle; override;

GetMaskHandle - returns a bitmap handle for the Mask

  function GetPalette; override;

GetPalette - returns a Handle for the Palette

  function GetPixelFormat; override;

GetPixelFormat - returns the pixel format for the Image

  function GetRawImagePtr; override;

GetRawImagePtr - returns a pointer to the Raw Image

  function GetRawImageDescriptionPtr; override;

GetRawImageDescriptionPtr - returns a pointer to a raw image description

  procedure HandleNeeded; override;

HandleNeeded - method to signal that a handle is required

  function InternalReleaseBitmapHandle; override;

InternalReleaseBitmapHandle - releases Bitmap Handle and returns its value

  function InternalReleaseMaskHandle; override;

InternalReleaseMaskHandle - releases Mask Handle and returns its value

  function InternalReleasePalette; override;

InternalReleasePalette - releases Palette Handle and returns its value

  procedure RawimageNeeded();

RawimageNeeded - method to signal that a raw image is required; if ADescOnly is True, only a descriptor is required

  procedure SetHandle(); override;

SetHandle - specifies Handle for Image

  procedure SetPixelFormat(); override;

SetPixelFormat - specifies the format for Pixels in this Image

  procedure UnshareImage(); override;

UnshareImage - stops an image from being shared: if CopyContent is True, the Image gets copied

  function UpdateHandles(); override;

UpdateHandles - called when handles are created from rawimage (true when handle changed)

public

  constructor Create; override;

Create - constructor for TCustomBitmap: performs inherited Create and initialises pixel format

  destructor Destroy; override;

Destroy - destructor for TCustomBitmap: frees any Mask handles, then performs inherited Destroy

  procedure Clear; override;

Clear the resources used by the Graphic, leaving a blank Graphic

  function GetResourceType; override;

GetResourceType - returns the type of a resource to be used in the graphic

  function LazarusResourceTypeValid(); override;

Check that the Resource specified for reading or writing is a valid type - result True if it is

  function BitmapHandleAllocated; override;

BitmapHandleAllocated - returns True if a handle has been allocated for the Bitmap

  function MaskHandleAllocated; override;

MaskHandleAllocated - returns True if a handle has been allocated for the Mask

  function PaletteAllocated; override;

PaletteAllocated - returns True if a Palette has been allocated

  function ReleaseHandle;

Release the bitmap handle, effectively freeing resources

  procedure SetHandles(); override;

SetHandles - allows the user to specify handles

  procedure SetSize(); override;

SetSize - allows the user to specify the size of the Bitmap

  property Handle: HBITMAP; [rw]

The operating system Handle ssociated with this bitmap

  property HandleType: TBitmapHandleType; [rw]

The type of system handle

  property Monochrome: Boolean; [rw]

Whether using monochrome display

end;

TCustomBitmap

TCustomBitMap - the base class for TBitmap

TRasterImage

TRasterImage - base class for a number of graphic controls, including TCustomBitmap and TCustomIcon, which use a raster of dots to display graphic information

TGraphic

TGraphic - Base class for dealing with Graphic images

TPersistent

TObject