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157 | with
ada.unchecked_Deallocation;
package body openGL.Glyph.Container
is
---------
--- Forge
--
function to_glyph_Container (parent_Face : in freetype.Face.view) return openGL.glyph.Container.item
is
Self : openGL.glyph.Container.item;
begin
Self.Face := parent_Face;
Self.Err := 0;
Self.charMap := new freetype.charMap.Item' (freetype.charMap.to_charMap (Self.Face));
return Self;
end to_glyph_Container;
procedure destruct (Self : in out Item)
is
use Glyph_Vectors;
procedure deallocate is new ada.unchecked_Deallocation (openGL.Glyph.item'Class, Glyph_view);
procedure deallocate is new ada.unchecked_Deallocation (freetype.charMap.item'Class, charMap_view);
Cursor : Glyph_Vectors.Cursor := Self.Glyphs.First;
the_Glyph : Glyph_view;
begin
while has_Element (Cursor)
loop
the_Glyph := Element (Cursor);
deallocate (the_Glyph);
next (Cursor);
end loop;
Self.Glyphs .clear;
Self.charMap.destruct;
deallocate (Self.charMap);
end destruct;
--------------
-- Attributes
--
function CharMap (Self : access Item; Encoding : in freeType_c.FT_Encoding) return Boolean
is
Result : constant Boolean := Self.charMap.CharMap (Encoding);
begin
Self.Err := Self.charMap.Error;
return Result;
end CharMap;
function FontIndex (Self : in Item; Character : in freetype.charMap.characterCode) return Natural
is
begin
return Natural (Self.charMap.FontIndex (Character));
end FontIndex;
procedure add (Self : in out Item; Glyph : in Glyph_view;
Character : in freetype.charMap.characterCode)
is
begin
Self.glyphs.append (Glyph);
Self.charMap.insertIndex (Character, Self.Glyphs.Length);
end add;
function Glyph (Self : in Item; Character : in freetype.charMap.characterCode) return Glyph_view
is
use type freetype.charMap.glyphIndex;
Index : constant freetype.charMap.glyphIndex := Self.charMap.GlyphListIndex (Character);
begin
if Index = -1
then return null;
else return Self.Glyphs.Element (Integer (Index));
end if;
end Glyph;
function BBox (Self : in Item; Character : in freetype.charMap.characterCode) return Bounds
is
begin
return Self.Glyph (Character).BBox;
end BBox;
function Advance (Self : in Item; Character : in freetype.charMap.characterCode;
nextCharacterCode : in freetype.charMap.characterCode) return Real
is
Left : constant freetype.charMap.glyphIndex := Self.charMap.FontIndex (Character);
Right : constant freetype.charMap.glyphIndex := Self.charMap.FontIndex (nextCharacterCode);
begin
return Real (Self.Face.KernAdvance (Integer (Left),
Integer (Right)) (1) + Float (Self.Glyph (Character).Advance));
end Advance;
function Error (Self : in Item) return freetype_c.FT_Error
is
begin
return Self.Err;
end Error;
--------------
-- Operations
--
function render (Self : access Item; Character : in freetype.charMap.characterCode;
nextCharacterCode : in freetype.charMap.characterCode;
penPosition : in Vector_3;
renderMode : in Integer) return Vector_3
is
use type freetype_c.FT_Error,
freetype.charMap.glyphIndex;
Left : constant freetype.charMap.glyphIndex := Self.charMap.FontIndex (Character) - 0;
Right : constant freetype.charMap.glyphIndex := Self.charMap.FontIndex (nextCharacterCode) - 0;
ft_kernAdvance : constant freetype.Vector_3 := Self.Face.KernAdvance (Integer (Left),
Integer (Right));
kernAdvance : Vector_3 := (ft_kernAdvance (1),
ft_kernAdvance (2),
ft_kernAdvance (3));
Index : freetype.charMap.glyphIndex;
begin
if Self.Face.Error = 0
then
Index := Self.charMap.GlyphListIndex (Character);
kernAdvance := kernAdvance + Self.Glyphs.Element (Integer (Index)).Render (penPosition,
renderMode);
else
raise openGL.Error with "Unable to render character '" & Character'Image & "'";
end if;
return kernAdvance;
end Render;
end openGL.Glyph.Container;
|