hugo overlay 源码
hugo overlay 代码
文件路径：/resources/images/overlay.go
// Copyright 2020 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 (
"fmt"
"image"
"image/draw"
"github.com/disintegration/gift"
)
var _ gift.Filter = (*overlayFilter)(nil)
type overlayFilter struct {
src ImageSource
x, y int
}
func (f overlayFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
overlaySrc, err := f.src.DecodeImage()
if err != nil {
panic(fmt.Sprintf("failed to decode image: %s", err))
}
gift.New().Draw(dst, src)
gift.New().DrawAt(dst, overlaySrc, image.Pt(f.x, f.y), gift.OverOperator)
}
func (f overlayFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
return image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
}
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