Declaration

TBitmap32 = class(TCustomBitmap32)

Description

TBitmap32 is the standard concrete 32-bit ARGB bitmap implementation in Graphics32. It inherits all core pixel buffer management, sub-pixel sampling, drawing primitives, blending modes, and resamplers from TCustomBitmap32.

In addition, TBitmap32 integrates with host OS graphics frameworks (VCL on Windows, LCL on cross-platform GUI toolkits) by exposing a standard VCL/LCL Canvas, device context (HDC), GDI bitmap surface handle (Handle), Font property for text rendering, and GDI drawing routines (TileTo, HDC Draw / DrawTo overloads).

Constructors & Destructors

Name	Description
Create	Inherited constructor that instantiates a new TBitmap32 bitmap instance.

Methods

Name	Description
DeleteCanvas	Frees and releases the internal VCL/LCL TCanvas instance allocated for this bitmap.
Draw	Draws a source bitmap, sub-rectangle, or GDI DC onto this bitmap.
DrawTo	Draws this bitmap onto a destination bitmap or GDI device context (HDC).
GetPlatformBackendClass	Returns the platform-default backend class used for surface management.
RenderText	Renders anti-aliased text directly into the bitmap buffer using specified color.
TextExtent	Calculates the pixel width and height dimensions of a text string when rendered using current Font.
TextHeight	Returns the height in pixels of a text string when rendered using current Font.
Textout	Renders text string onto the bitmap surface at specified coordinates or bounding rectangle using the current Font.
TextWidth	Returns the width in pixels of a text string when rendered using current Font.
TileTo	Tiles a source bitmap sub-rectangle repeatedly onto a target GDI device context (HDC).
UpdateFont	Notifies the backend that font property changes have occurred and updates font settings.

Properties

Name	Type	Scope	Description
BitmapInfo	TBitmapInfo	Public	Read-only GDI bitmap header information structure.
Canvas	TCanvas	Public	VCL/LCL drawing canvas bound to the bitmap's device context (HDC).
CanvasAllocated	boolean	Public	Indicates whether a VCL/LCL TCanvas instance is currently allocated for this bitmap.
Font	TFont	Public	Font instance used for canvas text rendering operations.
Handle	HBITMAP	Public	OS GDI bitmap surface handle.
HDC	HDC	Public	OS GDI device context handle bound to pixel buffer surface.

Events

Name	Type	Description
OnHandleChanged	TNotifyEvent	Fired when the OS GDI bitmap surface handle (Handle) changes or is re-allocated.