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Diffstat (limited to 'vendor/golang.org/x/image/font/opentype/face.go')
-rw-r--r--vendor/golang.org/x/image/font/opentype/face.go103
1 files changed, 103 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/font/opentype/face.go b/vendor/golang.org/x/image/font/opentype/face.go
new file mode 100644
index 0000000..88c28da
--- /dev/null
+++ b/vendor/golang.org/x/image/font/opentype/face.go
@@ -0,0 +1,103 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package opentype
+
+import (
+ "image"
+
+ "golang.org/x/image/font"
+ "golang.org/x/image/font/sfnt"
+ "golang.org/x/image/math/fixed"
+)
+
+// FaceOptions describes the possible options given to NewFace when
+// creating a new font.Face from a sfnt.Font.
+type FaceOptions struct {
+ Size float64 // Size is the font size in points
+ DPI float64 // DPI is the dots per inch resolution
+ Hinting font.Hinting // Hinting selects how to quantize a vector font's glyph nodes
+}
+
+func defaultFaceOptions() *FaceOptions {
+ return &FaceOptions{
+ Size: 12,
+ DPI: 72,
+ Hinting: font.HintingNone,
+ }
+}
+
+// Face implements the font.Face interface for sfnt.Font values.
+type Face struct {
+ f *sfnt.Font
+ hinting font.Hinting
+ scale fixed.Int26_6
+
+ buf sfnt.Buffer
+}
+
+// NewFace returns a new font.Face for the given sfnt.Font.
+// if opts is nil, sensible defaults will be used.
+func NewFace(f *sfnt.Font, opts *FaceOptions) (font.Face, error) {
+ if opts == nil {
+ opts = defaultFaceOptions()
+ }
+ face := &Face{
+ f: f,
+ hinting: opts.Hinting,
+ scale: fixed.Int26_6(0.5 + (opts.Size * opts.DPI * 64 / 72)),
+ }
+ return face, nil
+}
+
+// Close satisfies the font.Face interface.
+func (f *Face) Close() error {
+ return nil
+}
+
+// Metrics satisfies the font.Face interface.
+func (f *Face) Metrics() font.Metrics {
+ m, err := f.f.Metrics(&f.buf, f.scale, f.hinting)
+ if err != nil {
+ return font.Metrics{}
+ }
+ return m
+}
+
+// Kern satisfies the font.Face interface.
+func (f *Face) Kern(r0, r1 rune) fixed.Int26_6 {
+ x0 := f.index(r0)
+ x1 := f.index(r1)
+ k, err := f.f.Kern(&f.buf, x0, x1, fixed.Int26_6(f.f.UnitsPerEm()), f.hinting)
+ if err != nil {
+ return 0
+ }
+ return k
+}
+
+// Glyph satisfies the font.Face interface.
+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) {
+ panic("not implemented")
+}
+
+// GlyphBounds satisfies the font.Face interface.
+func (f *Face) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
+ advance, ok = f.GlyphAdvance(r)
+ if !ok {
+ return bounds, advance, ok
+ }
+ panic("not implemented")
+}
+
+// GlyphAdvance satisfies the font.Face interface.
+func (f *Face) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
+ idx := f.index(r)
+ advance, err := f.f.GlyphAdvance(&f.buf, idx, f.scale, f.hinting)
+ return advance, err == nil
+}
+
+func (f *Face) index(r rune) sfnt.GlyphIndex {
+ x, _ := f.f.GlyphIndex(&f.buf, r)
+ return x
+}