/usr/share/ada/adainclude/gtkada/gtkada-style.adb is in libgtkada2.24.4-dev 2.24.4dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- GtkAda - Ada95 binding for Gtk+/Gnome --
-- --
-- Copyright (C) 2011-2013, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public --
-- License as published by the Free Software Foundation; either --
-- version 2 of the License, or (at your option) any later version. --
-- --
-- This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public --
-- License along with this library; if not, write to the --
-- Free Software Foundation, Inc., 59 Temple Place - Suite 330, --
-- Boston, MA 02111-1307, USA. --
-- --
-----------------------------------------------------------------------
with Ada.Numerics; use Ada.Numerics;
with Glib; use Glib;
with Cairo; use Cairo;
with Pango.Cairo; use Pango.Cairo;
with Gdk.Cairo; use Gdk.Cairo;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Style; use Gtk.Style;
package body Gtkada.Style is
------------
-- To_HSV --
------------
function To_HSV (Color : Cairo_Color) return HSV_Color
is
Max, Min, Del : Gdouble;
Del_R, Del_G, Del_B : Gdouble;
Ret : HSV_Color;
begin
Max := Gdouble'Max (Gdouble'Max (Color.R, Color.G), Color.B);
Min := Gdouble'Min (Gdouble'Min (Color.R, Color.G), Color.B);
Del := Max - Min;
Ret.V := Max;
Ret.A := Color.Alpha;
if Del = 0.0 then
Ret.H := 0.0;
Ret.S := 0.0;
else
Ret.S := Del / Max;
Del_R := (((Del - Color.R) / 6.0) + (Del / 2.0)) / Del;
Del_G := (((Del - Color.G) / 6.0) + (Del / 2.0)) / Del;
Del_B := (((Del - Color.B) / 6.0) + (Del / 2.0)) / Del;
if Max = Color.R then
Ret.H := Del_B - Del_G;
elsif Max = Color.G then
Ret.H := (1.0 / 3.0) + Del_R - Del_B;
elsif Max = Color.B then
Ret.H := (2.0 / 3.0) + Del_G - Del_R;
end if;
if Ret.H < 0.0 then
Ret.H := Ret.H + 1.0;
end if;
if Ret.H >= 1.0 then
Ret.H := Ret.H - 1.0;
end if;
end if;
return Ret;
end To_HSV;
--------------
-- To_Cairo --
--------------
function To_Cairo (HSV : HSV_Color) return Cairo_Color
is
Var_H, Var_J, Var_1, Var_2, Var_3 : Gdouble;
Ret : Cairo_Color;
begin
Ret.Alpha := HSV.A;
if HSV.S = 0.0 then
Ret.R := HSV.V;
Ret.G := HSV.V;
Ret.B := HSV.V;
else
if HSV.H = 1.0 then
Var_H := 0.0;
else
Var_H := HSV.H * 6.0;
end if;
Var_J := Gdouble'Floor (Var_H);
Var_1 := HSV.V * (1.0 - HSV.S);
Var_2 := HSV.V * (1.0 - HSV.S * (Var_H - Var_J));
Var_3 := HSV.V * (1.0 - HSV.S * (1.0 - (Var_H - Var_J)));
if Var_J = 0.0 then
Ret.R := HSV.V;
Ret.G := Var_3;
Ret.B := Var_1;
elsif Var_J = 1.0 then
Ret.R := Var_2;
Ret.G := HSV.V;
Ret.B := Var_1;
elsif Var_J = 2.0 then
Ret.R := Var_1;
Ret.G := HSV.V;
Ret.B := Var_3;
elsif Var_J = 3.0 then
Ret.R := Var_1;
Ret.G := Var_2;
Ret.B := HSV.V;
elsif Var_J = 4.0 then
Ret.R := Var_3;
Ret.G := Var_1;
Ret.B := HSV.V;
else
Ret.R := HSV.V;
Ret.G := Var_1;
Ret.B := Var_2;
end if;
end if;
return Ret;
end To_Cairo;
--------------
-- To_Cairo --
--------------
function To_Cairo (Color : Gdk.Color.Gdk_Color) return Cairo_Color is
begin
return (R => Gdouble (Gdk.Color.Red (Color)) / 65535.0,
G => Gdouble (Gdk.Color.Green (Color)) / 65535.0,
B => Gdouble (Gdk.Color.Blue (Color)) / 65535.0,
Alpha => 1.0);
end To_Cairo;
-----------
-- Shade --
-----------
function Shade
(Color : Gdk.Color.Gdk_Color;
Value : Glib.Gdouble)
return Cairo_Color
is
begin
return Shade (To_Cairo (Color), Value);
end Shade;
-----------
-- Shade --
-----------
function Shade
(Color : Cairo_Color;
Value : Glib.Gdouble)
return Cairo_Color
is
HSV : HSV_Color;
begin
if Value /= 1.0 then
HSV := To_HSV (Color);
HSV.V := Gdouble'Min (1.0, HSV.V * Value);
return To_Cairo (HSV);
end if;
return Color;
end Shade;
----------------------
-- Set_Source_Color --
----------------------
procedure Set_Source_Color
(Cr : Cairo.Cairo_Context; Color : Cairo_Color) is
begin
Cairo.Set_Source_Rgba (Cr, Color.R, Color.G, Color.B, Color.Alpha);
end Set_Source_Color;
-----------------------
-- Rounded_Rectangle --
-----------------------
procedure Rounded_Rectangle
(Cr : Cairo.Cairo_Context;
X, Y, W, H : Glib.Gdouble;
Radius : Glib.Gdouble)
is
begin
Cairo.Move_To (Cr, X + Radius, Y);
Cairo.Arc
(Cr, X + W - Radius, Y + Radius, Radius, Pi * 1.5, Pi * 2.0);
Cairo.Arc
(Cr, X + W - Radius, Y + H - Radius, Radius, 0.0, Pi * 0.5);
Cairo.Arc
(Cr, X + Radius, Y + H - Radius, Radius, Pi * 0.5, Pi);
Cairo.Arc
(Cr, X + Radius, Y + Radius, Radius, Pi, Pi * 1.5);
end Rounded_Rectangle;
-----------------
-- Draw_Shadow --
-----------------
procedure Draw_Shadow
(Cr : Cairo.Cairo_Context;
Style : Gtk.Style.Gtk_Style;
Shadow_Type : Gtk.Enums.Gtk_Shadow_Type;
X, Y, Width, Height : Glib.Gint;
Corner_Radius : Glib.Gdouble := 0.0)
is
Hilight : Cairo_Color;
Shadow : Cairo_Color;
HSV : HSV_Color;
X_Thick : constant Gdouble := Gdouble (X_Thickness (Style)) / 4.0;
Radius : Gdouble;
dX, dY, dW, dH : Gdouble;
begin
if Shadow_Type = Shadow_None then
return;
end if;
Cairo.Save (Cr);
HSV := To_HSV (To_Cairo (Get_Bg (Style, State_Normal)));
HSV.V := 0.3;
Shadow := To_Cairo (HSV);
HSV.V := 0.9;
Hilight := To_Cairo (HSV);
dX := Gdouble (X) + X_Thick + 0.5;
dY := Gdouble (Y) + X_Thick + 0.5;
dW := Gdouble (Width) - 2.0 * X_Thick - 1.0;
dH := Gdouble (Height) - 2.0 * X_Thick - 1.0;
if Corner_Radius < X_Thick then
Radius := X_Thick;
else
Radius := Corner_Radius;
end if;
if Shadow_Type = Shadow_Out or else Shadow_Type = Shadow_Etched_Out then
Set_Line_Width (Cr, X_Thick);
Set_Source_Color (Cr, Hilight);
else
if X_Thick < 0.5 then
Set_Line_Width (Cr, 0.5);
else
Set_Line_Width (Cr, X_Thick);
end if;
Set_Source_Color (Cr, Shadow);
end if;
Rounded_Rectangle
(Cr, dX, dY, dW, dH, Radius);
Cairo.Stroke (Cr);
if Shadow_Type = Shadow_Out or else Shadow_Type = Shadow_Etched_Out then
if X_Thick < 0.5 then
Set_Line_Width (Cr, 0.5);
else
Set_Line_Width (Cr, X_Thick);
end if;
Set_Source_Color (Cr, Shadow);
else
Set_Line_Width (Cr, X_Thick);
Set_Source_Color (Cr, Hilight);
end if;
Rounded_Rectangle
(Cr,
dX + X_Thick, dY + X_Thick, dW - 2.0 * X_Thick, dH - 2.0 * X_Thick,
Radius - X_Thick * 1.0);
Cairo.Stroke (Cr);
Cairo.Restore (Cr);
end Draw_Shadow;
--------------------
-- Draw_Rectangle --
--------------------
procedure Draw_Rectangle
(Cr : Cairo.Cairo_Context;
Color : Gdk.Color.Gdk_Color;
Filled : Boolean;
X, Y, Width, Height : Glib.Gint;
Corner_Radius : Glib.Gdouble := 0.0) is
begin
Draw_Rectangle
(Cr, To_Cairo (Color), Filled, X, Y, Width, Height, Corner_Radius);
end Draw_Rectangle;
--------------------
-- Draw_Rectangle --
--------------------
procedure Draw_Rectangle
(Cr : Cairo.Cairo_Context;
Color : Cairo_Color;
Filled : Boolean;
X, Y, Width, Height : Glib.Gint;
Corner_Radius : Glib.Gdouble := 0.0)
is
dX, dY, dW, dH : Gdouble;
Line_Width : Gdouble;
begin
dX := Gdouble (X);
dY := Gdouble (Y);
dW := Gdouble (Width);
dH := Gdouble (Height);
if not Filled then
Line_Width := Get_Line_Width (Cr) / 2.0;
dX := dX + Line_Width;
dY := dY + Line_Width;
dW := dW - 2.0 * Line_Width;
dH := dH - 2.0 * Line_Width;
end if;
if Corner_Radius = 0.0 then
Rectangle (Cr, dX, dY, dW, dH);
else
Rounded_Rectangle (Cr, dX, dY, dW, dH, Corner_Radius);
end if;
Set_Source_Color (Cr, Color);
if Filled then
Cairo.Fill (Cr);
else
Stroke (Cr);
end if;
end Draw_Rectangle;
---------------
-- Draw_Line --
---------------
procedure Draw_Line
(Cr : Cairo.Cairo_Context;
Color : Gdk.Color.Gdk_Color;
X1, Y1, X2, Y2 : Glib.Gint) is
begin
Draw_Line (Cr, To_Cairo (Color), X1, Y1, X2, Y2);
end Draw_Line;
---------------
-- Draw_Line --
---------------
procedure Draw_Line
(Cr : Cairo.Cairo_Context;
Color : Cairo_Color;
X1, Y1, X2, Y2 : Glib.Gint)
is
Line_Width : Gdouble;
begin
Set_Source_Color (Cr, Color);
Line_Width := Get_Line_Width (Cr) / 2.0;
Move_To (Cr, Gdouble (X1) + Line_Width, Gdouble (Y1) + Line_Width);
Line_To (Cr, Gdouble (X2) + Line_Width, Gdouble (Y2) + Line_Width);
Stroke (Cr);
end Draw_Line;
-----------------
-- Draw_Layout --
-----------------
procedure Draw_Layout
(Cr : Cairo.Cairo_Context;
Color : Gdk.Color.Gdk_Color;
X, Y : Glib.Gint;
Layout : Pango.Layout.Pango_Layout)
is
begin
Draw_Layout (Cr, To_Cairo (Color), X, Y, Layout);
end Draw_Layout;
-----------------
-- Draw_Layout --
-----------------
procedure Draw_Layout
(Cr : Cairo.Cairo_Context;
Color : Cairo_Color;
X, Y : Glib.Gint;
Layout : Pango.Layout.Pango_Layout)
is
begin
Set_Source_Color (Cr, Color);
Move_To (Cr, Gdouble (X), Gdouble (Y));
Pango.Cairo.Show_Layout (Cr, Layout);
end Draw_Layout;
-----------------
-- Draw_Pixbuf --
-----------------
procedure Draw_Pixbuf
(Cr : Cairo.Cairo_Context;
Pixbuf : Gdk.Pixbuf.Gdk_Pixbuf;
X, Y : Glib.Gint)
is
begin
Gdk.Cairo.Set_Source_Pixbuf (Cr, Pixbuf, Gdouble (X), Gdouble (Y));
Cairo.Paint (Cr);
end Draw_Pixbuf;
end Gtkada.Style;
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