repo2/eclaireXL_ITX/scaler/pixels.vhdl @ 1476
| 970 | markw | LIBRARY ieee;
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USE ieee.std_logic_1164.all;
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package Pixels is
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type t_Pixel is record
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red : std_logic_vector(7 downto 0);
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green : std_logic_vector(7 downto 0);
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blue : std_logic_vector(7 downto 0);
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end record t_Pixel;
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type t_Pixel2x2 is array (0 to 3) of t_Pixel;
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type t_Pixel4x4 is array (0 to (4*4-1)) of t_Pixel;
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function pixel_to2x2(v: t_Pixel4x4) return t_Pixel2x2;
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function pixel2x2_idx(i,j : integer) return integer;
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function pixel4x4_idx(i,j : integer) return integer;
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end package Pixels;
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package body Pixels is
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function pixel_to2x2(v: t_Pixel4x4) return t_Pixel2x2 is
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variable res : t_Pixel2x2;
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begin
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for i in 0 to 1 loop
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for j in 0 to 1 loop
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res(pixel2x2_idx(i,j)) := v(pixel4x4_idx(i,j));
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end loop;
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end loop;
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return res;
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end pixel_to2x2;
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function pixel2x2_idx(i,j : integer) return integer is
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variable res : integer;
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begin
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res := i*2+j;
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return res;
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end pixel2x2_idx;
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function pixel4x4_idx(i,j : integer) return integer is
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variable res : integer;
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begin
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res := i*4+j;
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return res;
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end pixel4x4_idx;
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end Pixels;
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