mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
// Copyright 2021 The Hugo Authors. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package images
|
|
|
|
import (
|
|
"image"
|
|
"image/draw"
|
|
"io"
|
|
"strings"
|
|
|
|
"github.com/disintegration/gift"
|
|
"github.com/gohugoio/hugo/common/hugio"
|
|
|
|
"golang.org/x/image/font"
|
|
"golang.org/x/image/font/gofont/goregular"
|
|
"golang.org/x/image/font/opentype"
|
|
"golang.org/x/image/math/fixed"
|
|
)
|
|
|
|
var _ gift.Filter = (*textFilter)(nil)
|
|
|
|
type textFilter struct {
|
|
text, color string
|
|
x, y int
|
|
size float64
|
|
linespacing int
|
|
fontSource hugio.ReadSeekCloserProvider
|
|
}
|
|
|
|
func (f textFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
|
|
color, err := hexStringToColor(f.color)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Load and parse font
|
|
ttf := goregular.TTF
|
|
if f.fontSource != nil {
|
|
rs, err := f.fontSource.ReadSeekCloser()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer rs.Close()
|
|
ttf, err = io.ReadAll(rs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
otf, err := opentype.Parse(ttf)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Set font options
|
|
face, err := opentype.NewFace(otf, &opentype.FaceOptions{
|
|
Size: f.size,
|
|
DPI: 72,
|
|
Hinting: font.HintingNone,
|
|
})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
d := font.Drawer{
|
|
Dst: dst,
|
|
Src: image.NewUniform(color),
|
|
Face: face,
|
|
}
|
|
|
|
gift.New().Draw(dst, src)
|
|
|
|
// Draw text, consider and include linebreaks
|
|
maxWidth := dst.Bounds().Dx() - 20
|
|
fontHeight := face.Metrics().Ascent.Ceil()
|
|
|
|
// Correct y position based on font and size
|
|
f.y = f.y + fontHeight
|
|
|
|
// Start position
|
|
y := f.y
|
|
d.Dot = fixed.P(f.x, f.y)
|
|
|
|
// Draw text and break line at max width
|
|
parts := strings.Fields(f.text)
|
|
for _, str := range parts {
|
|
strWith := font.MeasureString(face, str)
|
|
if (d.Dot.X.Ceil() + strWith.Ceil()) >= maxWidth {
|
|
y = y + fontHeight + f.linespacing
|
|
d.Dot = fixed.P(f.x, y)
|
|
}
|
|
d.DrawString(str + " ")
|
|
}
|
|
}
|
|
|
|
func (f textFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
|
|
return image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
|
|
}
|