mirror of
https://github.com/willnorris/imageproxy.git
synced 2025-01-06 22:40:34 -05:00
107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
/*
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* Copyright (c) 2014 Christian Muehlhaeuser
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Christian Muehlhaeuser <muesli@gmail.com>
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* Michael Wendland <michael@michiwend.com>
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*/
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/*
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Package smartcrop implements a content aware image cropping library based on
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Jonas Wagner's smartcrop.js https://github.com/jwagner/smartcrop.js
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*/
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package smartcrop
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import (
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"errors"
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"image"
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"image/color"
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"image/jpeg"
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"image/png"
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"os"
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"path/filepath"
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)
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func debugOutput(debug bool, img *image.RGBA, debugType string) {
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if debug {
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writeImage("png", img, "./smartcrop_"+debugType+".png")
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}
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}
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func writeImage(imgtype string, img image.Image, name string) error {
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if err := os.MkdirAll(filepath.Dir(name), 0755); err != nil {
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panic(err)
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}
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switch imgtype {
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case "png":
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return writeImageToPng(img, name)
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case "jpeg":
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return writeImageToJpeg(img, name)
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}
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return errors.New("Unknown image type")
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}
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func writeImageToJpeg(img image.Image, name string) error {
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fso, err := os.Create(name)
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if err != nil {
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return err
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}
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defer fso.Close()
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return jpeg.Encode(fso, img, &jpeg.Options{Quality: 100})
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}
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func writeImageToPng(img image.Image, name string) error {
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fso, err := os.Create(name)
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if err != nil {
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return err
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}
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defer fso.Close()
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return png.Encode(fso, img)
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}
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func drawDebugCrop(topCrop Crop, o *image.RGBA) {
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width := o.Bounds().Dx()
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height := o.Bounds().Dy()
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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r, g, b, _ := o.At(x, y).RGBA()
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r8 := float64(r >> 8)
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g8 := float64(g >> 8)
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b8 := uint8(b >> 8)
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imp := importance(topCrop, x, y)
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if imp > 0 {
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g8 += imp * 32
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} else if imp < 0 {
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r8 += imp * -64
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}
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nc := color.RGBA{uint8(bounds(r8)), uint8(bounds(g8)), b8, 255}
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o.SetRGBA(x, y, nc)
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}
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}
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}
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