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descriptor.go
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descriptor.go
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// Copyright 2020 Frederik Zipp. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bmfont
import (
"image"
"io"
"os"
"path/filepath"
)
// A Descriptor holds metadata for a bitmap font.
type Descriptor struct {
Info Info
Common Common
Pages map[int]Page
Chars map[rune]Char
Kerning map[CharPair]Kerning
}
type Info struct {
Face string
Size int
Bold bool
Italic bool
Charset string
Unicode bool
StretchH int
Smooth bool
AA int
Padding Padding
Spacing Spacing
Outline int
}
type Padding struct {
Up, Right, Down, Left int
}
type Spacing struct {
Horizontal, Vertical int
}
type Common struct {
LineHeight int
Base int
ScaleW int
ScaleH int
Packed bool
AlphaChannel ChannelInfo
RedChannel ChannelInfo
GreenChannel ChannelInfo
BlueChannel ChannelInfo
}
func (c *Common) Scale() image.Point {
return image.Pt(c.ScaleH, c.ScaleH)
}
type ChannelInfo int
const (
Glyph ChannelInfo = iota
Outline
GlyphAndOutline
Zero
One
)
type Page struct {
ID int
File string
}
type Char struct {
ID rune
X int
Y int
Width int
Height int
XOffset int
YOffset int
XAdvance int
Page int
Channel Channel
}
func (c *Char) Pos() image.Point {
return image.Pt(c.X, c.Y)
}
func (c *Char) Size() image.Point {
return image.Pt(c.Width, c.Height)
}
func (c *Char) Bounds() image.Rectangle {
return image.Rectangle{
Min: c.Pos(),
Max: c.Pos().Add(c.Size()),
}
}
func (c *Char) Offset() image.Point {
return image.Pt(c.XOffset, c.YOffset)
}
type Channel int
const (
Blue Channel = 1
Green Channel = 2
Red Channel = 4
Alpha Channel = 8
All Channel = 15
)
// CharPair is a pair of characters. It is used as the key in the font's
// kerning map.
type CharPair struct {
First, Second rune
}
// Kerning is a horizontal offset in pixels to be used if a specific character
// pair occurs when drawing text. It is used for the values in the font's
// kerning map.
type Kerning struct {
Amount int
}
// LoadDescriptor loads the font descriptor data from a BMFont descriptor file in
// text format (usually with the file extension .fnt). It does not load the
// referenced page sheet images. If you also want to load the page sheet
// images, use the Load function to get a complete BitmapFont instance.
func LoadDescriptor(path string) (d *Descriptor, err error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer closeChecked(f, &err)
return parseDescriptor(filepath.Base(path), f)
}
// ReadDescriptor parses font descriptor data in BMFont's text format from a
// reader. It does not load the referenced page sheet images. If you also want
// to load the page sheet images, use the Load function to get a complete
// BitmapFont instance.
func ReadDescriptor(r io.Reader) (d *Descriptor, err error) {
return parseDescriptor("bmfont", r)
}