/
processing.go
71 lines (60 loc) · 2.27 KB
/
processing.go
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// Copyright (c) 2014 Oyster
// Copyright (c) 2015 Hotel Booker B.V.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package nibbleshell
import (
"errors"
"fmt"
"image"
"image/jpeg"
"image/png"
"github.com/disintegration/imaging"
)
type ImageProcessorOptions struct {
Width, Height, X, Y uint32
ScaleX, ScaleY int32
Quality uint8
}
func (ipo *ImageProcessorOptions) String() string {
return fmt.Sprintf("w=%dh=%dx=%xy=%dsx=%dsy=%d", ipo.Width, ipo.Height, ipo.X, ipo.Y, ipo.ScaleX, ipo.ScaleY)
}
func (ipo *ImageProcessorOptions) ProcessImage(source *Image) (*Image, error) {
dest := &Image{format: source.format}
var wip image.Image
if ipo.ScaleX == -1 {
wip = imaging.FlipH(source.image)
} else {
wip = source.image
}
if ipo.X != 0 || ipo.Y != 0 || ipo.Width != source.Width() || ipo.Height != source.Height() {
r := image.Rectangle{image.Point{int(ipo.X), int(ipo.Y)}, image.Point{int(ipo.X + ipo.Width), int(ipo.Y + ipo.Height)}}
wip = imaging.Crop(wip, r)
}
var err error
switch dest.format {
case JPEG:
err = jpeg.Encode(&dest.buffer, wip, &jpeg.Options{int(ipo.Quality)})
case PNG:
err = png.Encode(&dest.buffer, wip)
default:
return nil, errors.New("attempt to encode to unsupported image format")
}
return dest, err
}