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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package pixel_pkg is
generic(
NBITS_IN : natural;
NBR_OF_CHROMA_IN : natural;
NBITS_OUT : natural;
NBR_OF_CHROMA_OUT : natural
);
subtype CHROMA_IN is unsigned(NBITS_IN-1 downto 0);
type TYPE_PIXEL_IN is array (NBR_OF_CHROMA_IN-1 downto 0) of CHROMA_IN;
subtype CHROMA_OUT is unsigned(NBITS_OUT-1 downto 0);
type TYPE_PIXEL_OUT is array (NBR_OF_CHROMA_OUT-1 downto 0) of CHROMA_OUT;
-- Note: every function is using unsigned vectors for now
function std_logic_vector_to_pixel_in( in_vector : in std_logic_vector(NBR_OF_CHROMA_IN*NBITS_IN-1 downto 0))
return TYPE_PIXEL_IN;
function pixel_out_to_std_logic_vector( out_pixel : in TYPE_PIXEL_OUT)
return std_logic_vector;
function "not" ( pixel_in : in TYPE_PIXEL_IN)
return TYPE_PIXEL_OUT;
end package pixel_pkg;
package body pixel_pkg is
function std_logic_vector_to_pixel_in( in_vector : in std_logic_vector(NBR_OF_CHROMA_IN*NBITS_IN-1 downto 0))
return TYPE_PIXEL_IN is
variable pixel_in : TYPE_PIXEL_IN;
begin
for chroma in 0 to NBR_OF_CHROMA_IN -1 loop
pixel_in(chroma) := unsigned(in_vector((chroma+1)*NBITS_IN-1 downto chroma*NBITS_IN));
end loop;
return pixel_in;
end function std_logic_vector_to_pixel_in;
function pixel_out_to_std_logic_vector( out_pixel : in TYPE_PIXEL_OUT)
return std_logic_vector is
variable out_vector : std_logic_vector(NBR_OF_CHROMA_OUT*NBITS_OUT-1 downto 0);
begin
for chroma in 0 to NBR_OF_CHROMA_OUT loop
out_vector((chroma+1)*NBITS_OUT-1 downto chroma*NBITS_OUT) := std_logic_vector(out_pixel(chroma));
end loop;
return out_vector;
end function pixel_out_to_std_logic_vector;
function "not" ( pixel_in : in TYPE_PIXEL_IN)
return TYPE_PIXEL_OUT is
variable pixel_out : TYPE_PIXEL_OUT;
begin
for index in pixel_in'range loop
pixel_out(index) := not pixel_in(index);
end loop;
return pixel_out;
end function "not";
end package body pixel_pkg;
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