mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 05:42:09 -05:00
50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright 2023 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/color"
|
|
"image/draw"
|
|
|
|
"github.com/disintegration/gift"
|
|
)
|
|
|
|
var _ gift.Filter = (*paddingFilter)(nil)
|
|
|
|
type paddingFilter struct {
|
|
top, right, bottom, left int
|
|
ccolor color.Color // canvas color
|
|
}
|
|
|
|
func (f paddingFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
|
|
w := src.Bounds().Dx() + f.left + f.right
|
|
h := src.Bounds().Dy() + f.top + f.bottom
|
|
|
|
if w < 1 {
|
|
panic("final image width will be less than 1 pixel: check padding values")
|
|
}
|
|
if h < 1 {
|
|
panic("final image height will be less than 1 pixel: check padding values")
|
|
}
|
|
|
|
i := image.NewRGBA(image.Rect(0, 0, w, h))
|
|
draw.Draw(i, i.Bounds(), image.NewUniform(f.ccolor), image.Point{}, draw.Src)
|
|
gift.New().Draw(dst, i)
|
|
gift.New().DrawAt(dst, src, image.Pt(f.left, f.top), gift.OverOperator)
|
|
}
|
|
|
|
func (f paddingFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
|
|
return image.Rect(0, 0, srcBounds.Dx()+f.left+f.right, srcBounds.Dy()+f.top+f.bottom)
|
|
}
|