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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"
"image/draw"
"sort"
)
type compositeInfoSorter []CompositeInfo
func (a compositeInfoSorter) Len() int { return len(a) }
func (a compositeInfoSorter) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a compositeInfoSorter) Less(i, j int) bool { return a[i].Z < a[j].Z }
type CompositeInfo struct {
File string
X, Y, Z int
}
// CompositeImageSet composite a set of image files.
func CompositeImageSet(srcfile string, compinfos []CompositeInfo, dstfile string, f Format) (err error) {
srcimg, err := LoadImage(srcfile)
if err != nil {
return
}
dstimg := convertToRGBA(srcimg)
sort.Sort(compositeInfoSorter(compinfos))
for _, compinfo := range compinfos {
var compimg image.Image
compimg, err = LoadImage(compinfo.File)
if err != nil {
return
}
Composite(dstimg, compimg, compinfo.X, compinfo.Y)
}
err = SaveImage(dstfile, dstimg, f)
dstimg.Pix = nil
return
}
// CompositeImage composite two image files.
func CompositeImage(srcfile, compfile, dstfile string, x, y int, f Format) (err error) {
srcimg, err := LoadImage(srcfile)
if err != nil {
return
}
compimg, err := LoadImage(compfile)
if err != nil {
return
}
dstimg := convertToRGBA(srcimg)
Composite(dstimg, compimg, x, y)
err = SaveImage(dstfile, dstimg, f)
dstimg.Pix = nil
return
}
// CompositeImageUri composite two images which format in data uri.
func CompositeImageUri(srcDatauri, compDataUri string, x, y int, f Format) (dstDataUri string, err error) {
srcimg, err := LoadImageFromDataUri(srcDatauri)
if err != nil {
return
}
compimg, err := LoadImageFromDataUri(compDataUri)
if err != nil {
return
}
dstimg := convertToRGBA(srcimg)
Composite(dstimg, compimg, x, y)
dstDataUri, err = ConvertImageObjectToDataUri(dstimg, f)
dstimg.Pix = nil
return
}
// CompositeImage composite two image objects.
func Composite(dstimg draw.Image, compimg image.Image, x, y int) {
w, h := GetSize(compimg)
r := image.Rect(x, y, x+w, y+h)
draw.Draw(dstimg, r, compimg, image.Point{0, 0}, draw.Over)
}
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