Used to store and restore canvas states in the SaveState and RestoreState methods. Contains TLazCanvasState class instances.

DoCreateDefaultFont is an overridden TFPCustomFont function used to provide the default font for the canvas class instance. DoCreateDefaultFont implements the abstract virtual method defined in an ancestor class, and emulates the method defined in TCanvas.

DoCreateDefaultFont sets the Size property in the font to zero (0); this causes the default font size for the platform or widget set to be used. The FPColor property in the font is set to colBlack.

Adjusts the values in Bounds to use the coordinate system in TCanvas, and draws borders using the style and/or pattern in the Pen for the canvas.

DoRectangleFill is used to optimize and fill a rectangle area.

Adjusts the fcl-image coordinate system to be compatible with coordinates used in TCanvas.

Implements a polygon fill algorithm not present in fcl-image. The algorithm is explained here.

HasNoImage is a Boolean member used to indicate if a valid TFPCustomImage was provided as an argument to the Create constructor. Used in the implementation of the UpdateControlLazImageAndCanvas routine for non-native custom drawn window controls.

NativeDC is a PtrInt member which contains the device context used to render a custom-drawn LCL control.

Create is the constructor for the class instance. Create calls the inherited constructor using AnImage as an argument.

Create allocates resources for the GraphicStateList property. Create sets the value for the HasNoImage member to True when AnImage has not been assigned (contains Nil).

Destroy is the overridden destructor for the class instance. Destroy ensures that resources allocated for GraphicStateList, AssignedBrush, and AssignedPen are freed. Destroy calls the inherited destructor prior to exiting from the method.

SaveState is an Integer function used to save the current canvas state in the GraphicStateList member. SaveState creates an instance of TLazCanvasState with copies of the current values for Brush, Pen, and Font. Values from BaseWindowOrg, WindowOrg, and Clipping are also assigned to the class instance.

The return value contains the ordinal position in GraphicStateList where the canvas state was added in the method.

Use RestoreState to restore the canvas to the state stored at a specified position in the list.

This is a safer version for use where the destination pixels may not be consistent or valid. It will draw as if the target area contained opaque white pixels.

Fills the entire drawing area with the specified color. AIgnoreClippingAndWindowOrg speeds up canvas drawing operations, but it is dangerous; don't use it unless you know what you are doing.

Utilized by LCLIntf.SelectObject and by the RestoreState method. This is needed because calling Assign for the Pen, Brush, or Font properties raises exceptions.

Utilized by LCLIntf.SelectObject and by the RestoreState method. This is needed because calling Assign for the Pen, Brush, or Font properties raises exceptions.

Utilized by LCLIntf.SelectObject and by the RestoreState method. This is needed because calling Assign for the Pen, Brush, or Font properties raises exceptions.

These properties are utilized to implement LCLIntf.SelectObject to keep track of which pen/brush/font handle was assigned to this canvas. They are not utilized by TLazCanvas itself.

These properties are used to implement LCLIntf.SelectObject to keep track of which pen/brush/font handle was assigned to this canvas. They are not utilized by TLazCanvas itself.

These properties are used to implement LCLIntf.SelectObject to keep track of which pen/brush/font handle was assigned to this canvas. They are not utilized by TLazCanvas itself.

The values in WindowOrg are relative to the coordinates in BaseWindowOrg. BaseWindowOrg coordinates are relative to the canvas for the containing Form. It is useful when implementing the non-native windowed controls.

Contains the absolute coordinates for the canvas with BaseWindowOrg summed up.