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-- Programmed by Jedidiah Barber
-- Released into the public domain
package FLTK.Images.Bitmaps is
type Bitmap is new Image with private;
type Bitmap_Reference (Data : not null access Bitmap'Class) is limited null record
with Implicit_Dereference => Data;
function To_Next_Byte
(Bits : in Natural)
return Natural;
package Forge is
-- Please note that input data should be some declared item
-- that lives at least as long as the resulting Bitmap.
function Create
(Data : in Color_Component_Array;
Width, Height : in Natural)
return Bitmap
with Pre => Data'Length = To_Next_Byte (Width) * Height;
end Forge;
-- Copying --
function Copy
(This : in Bitmap;
Width, Height : in Natural)
return Bitmap'Class;
function Copy
(This : in Bitmap)
return Bitmap'Class;
-- Activity --
procedure Uncache
(This : in out Bitmap);
-- Pixel Data --
function Data_Size
(This : in Bitmap)
return Natural;
function Get_Datum
(This : in Bitmap;
Place : in Positive)
return Color_Component
with Pre => Place <= This.Data_Size;
procedure Set_Datum
(This : in out Bitmap;
Place : in Positive;
Value : in Color_Component)
with Pre => Place <= This.Data_Size;
function Slice
(This : in Bitmap;
Low : in Positive;
High : in Natural)
return Color_Component_Array
with Pre => High <= This.Data_Size,
Post => Slice'Result'Length = Integer'Max (0, High - Low + 1);
procedure Overwrite
(This : in out Bitmap;
Place : in Positive;
Values : in Color_Component_Array)
with Pre => Place + Values'Length - 1 <= This.Data_Size;
function All_Data
(This : in Bitmap)
return Color_Component_Array
with Post => All_Data'Result'Length = This.Data_Size;
-- Drawing --
procedure Draw
(This : in Bitmap;
X, Y : in Integer);
procedure Draw
(This : in Bitmap;
X, Y, W, H : in Integer;
Clip_X, Clip_Y : in Integer := 0);
private
type Bitmap is new Image with null record;
overriding procedure Finalize
(This : in out Bitmap);
pragma Inline (To_Next_Byte);
pragma Inline (Copy);
pragma Inline (Uncache);
pragma Inline (Data_Size);
pragma Inline (Get_Datum);
pragma Inline (Set_Datum);
pragma Inline (Slice);
pragma Inline (Overwrite);
pragma Inline (All_Data);
pragma Inline (Draw);
end FLTK.Images.Bitmaps;
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