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-- $Date: 2004/03/08 11:09:21 $
-- $Revision: 1.17 $
-- $Author: jcrocholl $
with Images; use Images;
package Gray_Images is
-- A gray pixel, represented by an octet (values 0 .. 255).
type Gray_Pixel is mod 256;
Black : constant Gray_Pixel := 0;
Gray : constant Gray_Pixel := 128;
White : constant Gray_Pixel := 255;
-- Compare two gray pixels.
function Darker
(A, B : in Gray_Pixel) -- Compare these pixels.
return Boolean; -- True if A is darker than B.
-- An unconstrained one-dimensional array of gray pixels.
type Gray_Pixel_Array is
array(Positive range <>) of Gray_Pixel;
pragma Pack(Gray_Pixel_Array);
-- An unconstrained two-dimensional array of gray pixels.
type Gray_Pixel_Array_2 is
array(Positive range <>, Positive range <>) of Gray_Pixel;
pragma Pack(Gray_Pixel_Array_2);
-- A gray image of the size specified by Width and Height.
type Gray_Image(Width, Height : Positive) is
new Image(Width, Height) with
record
Pixels : Gray_Pixel_Array_2(1 .. Height, 1 .. Width);
end record;
-- Access type for Gray_Image_Record and all inherited types.
type Gray_Image_Access is access all Gray_Image'Class;
-- Solid color background fill.
procedure Fill
(This : access Gray_Image; -- Fill this image.
Color : in Gray_Pixel); -- With this color.
end Gray_Images;