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/*
* Copyright (c) 2014 Christian Muehlhaeuser
*
* 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.
*
* Authors:
* Christian Muehlhaeuser <muesli@gmail.com>
* Michael Wendland <michael@michiwend.com>
* Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
*/
/*
Package smartcrop implements a content aware image cropping library based on
Jonas Wagner's smartcrop.js https://github.com/jwagner/smartcrop.js
*/
package smartcrop
import (
"errors"
"image"
"image/color"
"image/jpeg"
"image/png"
"os"
"path/filepath"
)
func debugOutput(debug bool, img *image.RGBA, debugType string) {
if debug {
writeImage("png", img, "./smartcrop_"+debugType+".png")
}
}
func writeImage(imgtype string, img image.Image, name string) error {
if err := os.MkdirAll(filepath.Dir(name), 0755); err != nil {
panic(err)
}
switch imgtype {
case "png":
return writeImageToPng(img, name)
case "jpeg":
return writeImageToJpeg(img, name)
}
return errors.New("Unknown image type")
}
func writeImageToJpeg(img image.Image, name string) error {
fso, err := os.Create(name)
if err != nil {
return err
}
defer fso.Close()
return jpeg.Encode(fso, img, &jpeg.Options{Quality: 100})
}
func writeImageToPng(img image.Image, name string) error {
fso, err := os.Create(name)
if err != nil {
return err
}
defer fso.Close()
return png.Encode(fso, img)
}
func drawDebugCrop(topCrop Crop, o *image.RGBA) {
width := o.Bounds().Dx()
height := o.Bounds().Dy()
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
r, g, b, _ := o.At(x, y).RGBA()
r8 := float64(r >> 8)
g8 := float64(g >> 8)
b8 := uint8(b >> 8)
imp := importance(topCrop, x, y)
if imp > 0 {
g8 += imp * 32
} else if imp < 0 {
r8 += imp * -64
}
nc := color.RGBA{uint8(bounds(r8)), uint8(bounds(g8)), b8, 255}
o.SetRGBA(x, y, nc)
}
}
}
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