1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174

use std::ptr::null_mut;
use {
    ffi,
    BBox,
    BitmapGlyph,
    FtResult,
    Matrix,
    RenderMode,
    Stroker,
    Vector
};

/// Represents a retrieved glyph from the library
///
/// Note that when this glyph is dropped, so is the library
pub struct Glyph {
    library_raw: ffi::FT_Library,
    raw: ffi::FT_Glyph
}

impl Glyph {
    /// Create a freetype-rs glyph object from c constituent parts
    pub unsafe fn from_raw(library_raw: ffi::FT_Library, raw: ffi::FT_Glyph) -> Self {
        ffi::FT_Reference_Library(library_raw);
        Glyph { library_raw, raw }
    }

    /// Transform a glyph image if its format is scalable.
    pub fn transform(&self, mut matrix: Option<Matrix>, mut delta: Option<Vector>)
                     -> FtResult<()> {
        let mut p_matrix = null_mut();
        let mut p_delta = null_mut();

        if let Some(ref mut m) = matrix {
            p_matrix = m as *mut Matrix;
        }
        if let Some(ref mut d) = delta {
            p_delta = d as *mut Vector;
        }
        let err = unsafe {
            ffi::FT_Glyph_Transform(self.raw, p_matrix, p_delta)
        };
        if err == ffi::FT_Err_Ok {
            Ok(())
        } else {
            Err(err.into())
        }
    }

    /// Return a glyph's ‘control box’. The control box encloses all the outline's points,
    /// including Bézier control points. Though it coincides with the exact bounding box for most
    /// glyphs, it can be slightly larger in some situations (like when rotating an outline that
    /// contains Bézier outside arcs).
    ///
    /// Computing the control box is very fast, while getting the bounding box can take much more
    /// time as it needs to walk over all segments and arcs in the outline. To get the latter, you
    /// can use the ‘ftbbox’ component, which is dedicated to this single task.
    pub fn get_cbox(&self, bbox_mode: ffi::FT_Glyph_BBox_Mode) -> BBox {
        let mut acbox = ffi::FT_BBox {
            xMin: 0,
            yMin: 0,
            xMax: 0,
            yMax: 0
        };
        unsafe {
            ffi::FT_Glyph_Get_CBox(self.raw, bbox_mode, &mut acbox)
        };
        acbox
    }

    /// Convert a given glyph object to a bitmap glyph object.
    pub fn to_bitmap(&self, render_mode: RenderMode, mut origin: Option<Vector>) -> FtResult<BitmapGlyph> {
        let mut the_glyph = self.raw;
        let mut p_origin = null_mut();

        if let Some(ref mut o) = origin {
            p_origin = o as *mut Vector;
        }
        let err = unsafe {
            ffi::FT_Glyph_To_Bitmap(&mut the_glyph, render_mode as u32, p_origin, 0)
        };
        if err == ffi::FT_Err_Ok {
            Ok(unsafe { BitmapGlyph::from_raw(self.library_raw, the_glyph as ffi::FT_BitmapGlyph) })
        } else {
            Err(err.into())
        }
    }

    pub fn stroke(&self, stroker: &Stroker) -> FtResult<Glyph> {
        let mut the_glyph = self.raw;

        let err = unsafe {
            ffi::FT_Glyph_Stroke(&mut the_glyph, stroker.raw_stroker(), false as ffi::FT_Bool)
        };

        if err == ffi::FT_Err_Ok {
            Ok(unsafe { Glyph::from_raw(self.library_raw, the_glyph) })
        } else {
            Err(err.into())
        }
    }

    pub fn stroke_border(&self, stroker: &Stroker, inside: bool) -> FtResult<Glyph> {
        let mut the_glyph = self.raw;

        let err = unsafe {
            ffi::FT_Glyph_StrokeBorder(&mut the_glyph, stroker.raw_stroker(), inside as ffi::FT_Bool, false as ffi::FT_Bool)
        };

        if err == ffi::FT_Err_Ok {
            Ok(unsafe { Glyph::from_raw(self.library_raw, the_glyph) })
        } else {
            Err(err.into())
        }
    }

    pub fn advance_x(&self) -> isize {
        unsafe {
            (*self.raw).advance.x as isize
        }
    }

    pub fn advance_y(&self) -> isize {
        unsafe {
            (*self.raw).advance.y as isize
        }
    }

    /// An enumeration type used to describe the format of a given glyph image. Note that this
    /// version of FreeType only supports two image formats, even though future font drivers will
    /// be able to register their own format.
    #[inline(always)]
    pub fn format(&self) -> ffi::FT_Glyph_Format {
        unsafe {
            (*self.raw).format
        }
    }

    /// Get the underlying c glyph struct (The system actually calls this a GlyphRec because it can
    /// be a different struct in different circumstances)
    #[inline(always)]
    pub fn raw(&self) -> &ffi::FT_GlyphRec {
        unsafe {
            &*self.raw
        }
    }
}

impl Clone for Glyph {
    fn clone(&self) -> Self {
        let mut target = null_mut();

        let err = unsafe {
            ffi::FT_Glyph_Copy(self.raw, &mut target)
        };
        if err == ffi::FT_Err_Ok {
            unsafe { Glyph::from_raw(self.library_raw, target) }
        } else {
            panic!("Failed to copy glyph")
        }
    }
}

impl Drop for Glyph {
    fn drop(&mut self) {
        let err = unsafe {
            ffi::FT_Done_Glyph(self.raw);
            ffi::FT_Done_Library(self.library_raw)
        };
        if err != ffi::FT_Err_Ok {
            panic!("Failed to drop library")
        }
    }
}