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-- $Date: 2004/03/05 07:40:04 $
-- $Revision: 1.1 $
-- $Author: jcrocholl $
with Ada.Streams.Stream_IO; use Ada.Streams.Stream_IO;
with Bit_Buffers;
package Depixel is
-- A buffer for an array of bits.
type Bit_Buffer(Byte_Count : Positive) is limited private;
-- Access type.
type Bit_Buffer_Access is access Bit_Buffer;
-- Create a bit buffer with a capacity of 8 * Byte_Count bits.
function Create
(Byte_Count : in Positive) -- The number of bytes in the buffer.
return Bit_Buffer_Access; -- The newly created bit buffer.
-- Free the bit buffer's memory and set the instance variable to
-- null.
procedure Deallocate
(This : in out Bit_Buffer_Access); -- Free this bit buffer.
-- Restart reading from the left of the bit buffer.
procedure Reset
(This : access Bit_Buffer); -- Reset this bit buffer.
-- Add another row with all bits set to False.
procedure Clear
(This : access Bit_Buffer); -- Add row to this bit buffer.
-- Add another row, filled with data from a stream.
procedure Read_Row
(From : in Stream_Access; -- Read from this stream.
This : access Bit_Buffer); -- Add row to this bit buffer.
-- Read the next bit from the bit buffer and advance the bit pointer.
function Read_Bit
(This : access Bit_Buffer) -- Read from this bit buffer.
return Boolean; -- The resulting bit value.
private
-- Wrap-around type with three values.
type Triple is mod 3;
subtype Natural_Triple is Natural range 0 .. 2;
-- Three regular bit buffers internally.
type Bit_Buffer_Array is array(Natural range <>) of Bit_Buffers.Bit_Buffer_Access;
-- Three by three matrix of bits.
type Bit_Matrix is array(Natural range <>, Natural range <>) of Boolean;
-- Record for bit data and pointers.
type Bit_Buffer(Byte_Count : Positive) is record
Internal : Bit_Buffer_Array(Natural_Triple);
Matrix : Bit_Matrix(Natural_Triple, Natural_Triple);
Center_X : Triple := 1;
Center_Y : Triple := 1;
end record;
end Depixel;