ActiveGo 1.8Package basicfont
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Face7x13 is a Face derived from the public domain X11 misc-fixed font files.
At the moment, it holds the printable characters in ASCII starting with space, and the Unicode replacement character U+FFFD.
Its data is entirely self-contained and does not require loading from separate files.
var Face7x13 = &Face{
Advance: 7,
Width: 6,
Height: 13,
Ascent: 11,
Descent: 2,
Mask: mask7x13,
Ranges: []Range{
{'\u0020', '\u007f', 0},
{'\ufffd', '\ufffe', 95},
},
}
type Face ¶
Face is a basic font face whose glyphs all have the same metrics.
It is safe to use concurrently.
type Face struct {
// Advance is the glyph advance, in pixels.
Advance int
// Width is the glyph width, in pixels.
Width int
// Height is the inter-line height, in pixels.
Height int
// Ascent is the glyph ascent, in pixels.
Ascent int
// Descent is the glyph descent, in pixels.
Descent int
// Left is the left side bearing, in pixels. A positive value means that
// all of a glyph is to the right of the dot.
Left int
// Mask contains all of the glyph masks. Its width is typically the Face's
// Width, and its height a multiple of the Face's Height.
Mask image.Image
// Ranges map runes to sub-images of Mask. The rune ranges must not
// overlap, and must be in increasing rune order.
Ranges []Range
}
func (*Face) Close ¶
func (f *Face) Close() error
func (*Face) Glyph ¶
func (f *Face) Glyph(dot fixed.Point26_6, r rune) (
dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool)
func (*Face) GlyphAdvance ¶
func (f *Face) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool)
func (*Face) GlyphBounds ¶
func (f *Face) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool)
func (*Face) Kern ¶
func (f *Face) Kern(r0, r1 rune) fixed.Int26_6
func (*Face) Metrics ¶
func (f *Face) Metrics() font.Metrics
type Range ¶
Range maps a contiguous range of runes to vertically adjacent sub-images of a Face's Mask image. The rune range is inclusive on the low end and exclusive on the high end.
If Low <= r && r < High, then the rune r is mapped to the sub-image of Face.Mask whose bounds are image.Rect(0, y*h, Face.Width, (y+1)*h), where y = (int(r-Low) + Offset) and h = (Face.Ascent + Face.Descent).
type Range struct {
Low, High rune
Offset int
}