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/*
* Copyright (C) 2014 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package graphic
import (
"image"
)
// FlipImageHorizontal flip image in horizontal direction, and save as
// target format.
func FlipImageHorizontal(srcfile, dstfile string, f Format) (err error) {
srcimg, err := LoadImage(srcfile)
if err != nil {
return err
}
dstimg := doFlipImageHorizontal(srcimg)
err = SaveImage(dstfile, dstimg, f)
dstimg.Pix = nil
return
}
// FlipImageVertical flip image in vertical direction, and save as
// target format.
func FlipImageVertical(srcfile, dstfile string, f Format) (err error) {
srcimg, err := LoadImage(srcfile)
if err != nil {
return err
}
dstimg := doFlipImageVertical(srcimg)
err = SaveImage(dstfile, dstimg, f)
dstimg.Pix = nil
return
}
func doFlipImageHorizontal(srcimg image.Image) (dstimg *image.RGBA) {
w, h := GetSize(srcimg)
dstimg = image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
dstimg.Set(w-x-1, y, srcimg.At(x, y))
}
}
return
}
func doFlipImageVertical(srcimg image.Image) (dstimg *image.RGBA) {
w, h := GetSize(srcimg)
dstimg = image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
dstimg.Set(x, h-y-1, srcimg.At(x, y))
}
}
return
}
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