mirror of
https://github.com/gohugoio/hugo.git
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50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright 2023 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"image"
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"image/color"
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"image/draw"
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"github.com/disintegration/gift"
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)
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var _ gift.Filter = (*paddingFilter)(nil)
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type paddingFilter struct {
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top, right, bottom, left int
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ccolor color.Color // canvas color
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}
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func (f paddingFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
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w := src.Bounds().Dx() + f.left + f.right
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h := src.Bounds().Dy() + f.top + f.bottom
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if w < 1 {
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panic("final image width will be less than 1 pixel: check padding values")
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}
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if h < 1 {
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panic("final image height will be less than 1 pixel: check padding values")
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}
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i := image.NewRGBA(image.Rect(0, 0, w, h))
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draw.Draw(i, i.Bounds(), image.NewUniform(f.ccolor), image.Point{}, draw.Src)
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gift.New().Draw(dst, i)
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gift.New().DrawAt(dst, src, image.Pt(f.left, f.top), gift.OverOperator)
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}
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func (f paddingFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
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return image.Rect(0, 0, srcBounds.Dx()+f.left+f.right, srcBounds.Dy()+f.top+f.bottom)
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}
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