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415 | with Ada.Unchecked_Deallocation;
package body WL.Bitmap_IO is
use WL.Binary_IO;
procedure Free is
new Ada.Unchecked_Deallocation (Bitmap_Data,
Bitmap_Data_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Bitmap_Color_Index_Data,
Bitmap_Color_Index_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Colormap_Type,
Colormap_Access);
Reversed : Boolean := False;
type Bitmap_Magic is new String (1 .. 2);
for Bitmap_Magic'Size use 16;
type Bitmap_Header is
record
File_Size : Word_32;
Creator_1 : Word_16;
Creator_2 : Word_16;
Data_Start : Word_32;
end record;
for Bitmap_Header'Size use 96;
type Bitmap_Information_Header is
record
Header_Size : Word_32;
Width : Word_32;
Height : Word_32;
Num_Planes : Word_16;
Bits_Per_Pixel : Word_16;
Compression : Word_32;
Image_Size : Word_32;
Horizontal_Res : Word_32;
Vertical_Res : Word_32;
Colormap_Size : Word_32;
Important_Colors : Word_32;
end record;
for Bitmap_Information_Header'Size use 40 * 8;
-----------------------
-- Adjust_Brightness --
-----------------------
function Adjust_Brightness
(Color : Color_Type;
Factor : Float)
return Color_Type
is
R : constant Float :=
Float'Min
(Float (Color.R) * Factor, 255.0);
G : constant Float :=
Float'Min
(Float (Color.G) * Factor, 255.0);
B : constant Float :=
Float'Min
(Float (Color.B) * Factor, 255.0);
begin
return (R => Color_Element (R),
G => Color_Element (G),
B => Color_Element (B),
Alpha => 255);
end Adjust_Brightness;
-----------
-- Close --
-----------
procedure Close (Bitmap : in out Bitmap_Type) is
begin
if Bitmap.Data /= null then
Free (Bitmap.Data);
end if;
if Bitmap.Indices /= null then
Free (Bitmap.Indices);
end if;
if Bitmap.Colormap /= null then
Free (Bitmap.Colormap);
end if;
end Close;
------------
-- Color --
------------
function Color (Item : Bitmap_Type;
X, Y : Natural)
return Color_Type
is
begin
if Has_Colormap (Item) then
return Colormap_Color (Item, Color_Index (Item, X, Y));
else
return Item.Data (X, Y);
end if;
end Color;
------------------
-- Color_Index --
------------------
function Color_Index (Item : Bitmap_Type;
X, Y : Natural)
return Color_Element
is
begin
return Item.Indices (X, Y);
end Color_Index;
----------------------
-- Colormap_Color --
----------------------
function Colormap_Color (Item : Bitmap_Type;
Index : Color_Element)
return Color_Type
is
begin
return Item.Colormap (Index);
end Colormap_Color;
-----------
-- Depth --
-----------
function Depth (Item : Bitmap_Type) return Natural is
begin
return Item.Depth;
end Depth;
-------------------
-- Has_Colormap --
-------------------
function Has_Colormap (Item : Bitmap_Type) return Boolean is
begin
return Item.Colormap /= null;
end Has_Colormap;
------------
-- Height --
------------
function Height (Item : Bitmap_Type) return Natural is
begin
return Item.Height;
end Height;
--------------------------
-- Linear_Interpolation --
--------------------------
function Linear_Interpolation
(Start_Color : Color_Type;
Finish_Color : Color_Type;
Start_Value : Integer;
Finish_Value : Integer;
Value : Integer)
return Color_Type
is
function Interpolate (Start, Finish : Color_Element)
return Color_Element;
-----------------
-- Interpolate --
-----------------
function Interpolate (Start, Finish : Color_Element)
return Color_Element
is
begin
return Color_Element ((Integer (Finish) - Integer (Start)) *
(Value - Start_Value)
/ (Finish_Value - Start_Value)
+ Integer (Start));
end Interpolate;
begin
if Start_Value = Finish_Value then
return Start_Color;
else
return (Interpolate (Start_Color.B, Finish_Color.B),
Interpolate (Start_Color.G, Finish_Color.G),
Interpolate (Start_Color.R, Finish_Color.R),
Interpolate (Start_Color.Alpha, Finish_Color.Alpha));
end if;
end Linear_Interpolation;
----------------
-- New_Bitmap --
----------------
function New_Bitmap (Width, Height : Natural) return Bitmap_Type is
Result : constant Bitmap_Type :=
(Width => Width,
Height => Height,
Depth => 32,
Data => new Bitmap_Data (0 .. Width - 1, 0 .. Height - 1),
Indices => null,
Colormap => null);
begin
Result.Data.all := (others => (others => (0, 0, 0, 1)));
return Result;
end New_Bitmap;
----------
-- Read --
----------
procedure Read (Bitmap : out Bitmap_Type;
File_Name : String)
is
File : File_Type;
begin
Open (File, In_File, File_Name);
Read (Bitmap, File);
Close (File);
exception
when others =>
Close (File);
raise;
end Read;
----------
-- Read --
----------
procedure Read (Bitmap : out Bitmap_Type;
File : in out WL.Binary_IO.File_Type)
is
Magic : Bitmap_Magic;
Header : Bitmap_Header;
Info_Header : Bitmap_Information_Header;
Row_Size : Word_32;
BPP : Word_32;
Used : array (Color_Element) of Natural;
begin
Copy (File, 0, 2, Magic'Address);
if Magic /= "BM" then
raise Constraint_Error with
"bad magic number: " & String (Magic);
end if;
Copy (File, 2, Header'Size / 8, Header'Address);
Copy (File, 14, Info_Header'Size / 8, Info_Header'Address);
BPP := Word_32 (Info_Header.Bits_Per_Pixel);
Bitmap.Depth := Natural (BPP);
Bitmap.Width := Natural (Info_Header.Width);
Bitmap.Height := Natural (Info_Header.Height);
if BPP <= 8 then
Bitmap.Indices :=
new Bitmap_Color_Index_Data (0 .. Bitmap.Width - 1,
0 .. Bitmap.Height - 1);
Bitmap.Colormap := new Colormap_Type;
Copy (File, 14 + Info_Header.Header_Size,
2**Natural (BPP) * 4,
Bitmap.Colormap.all'Address);
Used := (others => 0);
else
Bitmap.Data := new Bitmap_Data (0 .. Bitmap.Width - 1,
0 .. Bitmap.Height - 1);
end if;
Row_Size := Info_Header.Width * BPP / 8;
if Row_Size mod 4 /= 0 then
Row_Size := Row_Size + 4 - Row_Size mod 4;
end if;
for Y in 0 .. Bitmap.Height - 1 loop
for X in 0 .. Bitmap.Width - 1 loop
declare
Row_Offset : constant Word_32 :=
Header.Data_Start
+ Word_32 (Y) * Row_Size;
Col_Offset : constant Word_32 :=
Word_32 (X) * BPP / 8;
Bit_Offset : constant Natural :=
X * Natural (BPP) mod 8;
Color : Color_Type := (0, 0, 0, 0);
begin
if BPP >= 24 then
Copy (File, Row_Offset + Col_Offset, BPP / 8,
Color'Address);
if Reversed then
Bitmap.Data (X, Bitmap.Height - Y - 1) := Color;
else
Bitmap.Data (X, Y) := Color;
end if;
else
declare
W8 : Word_8;
Index : Color_Element;
begin
Read (File, W8, Row_Offset + Col_Offset);
if BPP < 8 then
W8 := W8 / (2 ** Bit_Offset)
mod (2 ** Natural (BPP));
end if;
Index := Color_Element (W8);
Used (Index) := Used (Index) + 1;
if Reversed then
Bitmap.Indices (X, Bitmap.Height - Y - 1) := Index;
else
Bitmap.Indices (X, Y) := Index;
end if;
end;
end if;
end;
end loop;
end loop;
end Read;
----------------
-- Set_Color --
----------------
procedure Set_Color (Item : Bitmap_Type;
X, Y : Natural;
Color : Color_Type)
is
begin
Item.Data (X, Y) := Color;
end Set_Color;
-----------------------
-- Set_Vertical_Flip --
-----------------------
procedure Set_Vertical_Flip (Value : Boolean := True) is
begin
Reversed := Value;
end Set_Vertical_Flip;
-----------
-- Width --
-----------
function Width (Item : Bitmap_Type) return Natural is
begin
return Item.Width;
end Width;
-----------
-- Write --
-----------
procedure Write (Bitmap : Bitmap_Type;
File_Name : String)
is
File : Binary_IO.File_Type;
Magic : constant Bitmap_Magic := "BM";
Header : Bitmap_Header;
Info_Header : Bitmap_Information_Header;
begin
Binary_IO.Create (File, Binary_IO.Out_File, File_Name);
Binary_IO.Write (File, 2, Magic'Address);
Header.File_Size := 16#36# +
32 * Word_32 (Bitmap.Width) * Word_32 (Bitmap.Height);
Header.Creator_1 := 16#424C#;
Header.Creator_2 := 16#414F#;
Header.Data_Start := 16#00000036#;
Binary_IO.Write (File, Header'Size / 8, Header'Address);
Info_Header.Header_Size := 16#0000_0028#;
Info_Header.Width := Word_32 (Bitmap.Width);
Info_Header.Height := Word_32 (Bitmap.Height);
Info_Header.Num_Planes := 1;
Info_Header.Bits_Per_Pixel := 32;
Info_Header.Compression := 0;
Info_Header.Image_Size :=
32 * Word_32 (Bitmap.Width) * Word_32 (Bitmap.Height);
Info_Header.Horizontal_Res := 2835;
Info_Header.Vertical_Res := 2835;
Info_Header.Colormap_Size := 0;
Info_Header.Important_Colors := 0;
Write (File, Info_Header'Size / 8, Info_Header'Address);
for Y in 0 .. Bitmap.Height - 1 loop
for X in 0 .. Bitmap.Width - 1 loop
declare
Color : constant Color_Type :=
(if Bitmap.Depth >= 24
then Bitmap.Data (X, Y)
else Bitmap.Colormap (Bitmap.Indices (X, Y)));
begin
Write (File, Word_8 (Color.B));
Write (File, Word_8 (Color.G));
Write (File, Word_8 (Color.R));
Write (File, Word_8 (Color.Alpha));
end;
end loop;
end loop;
Close (File);
end Write;
end WL.Bitmap_IO;
|