mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ebitenutil
|
|
|
|
import (
|
|
"github.com/hajimehoshi/ebiten"
|
|
"image"
|
|
"image/color/palette"
|
|
"image/draw"
|
|
"image/gif"
|
|
"io"
|
|
)
|
|
|
|
type recorder struct {
|
|
inner func(screen *ebiten.Image) error
|
|
writer io.Writer
|
|
gif *gif.GIF
|
|
currentFrame int
|
|
}
|
|
|
|
func (r *recorder) update(screen *ebiten.Image) error {
|
|
if err := r.inner(screen); err != nil {
|
|
return err
|
|
}
|
|
if r.currentFrame == len(r.gif.Image) {
|
|
return nil
|
|
}
|
|
img := image.NewPaletted(screen.Bounds(), palette.Plan9)
|
|
// TODO: This is too slow.
|
|
draw.Draw(img, img.Bounds(), screen, screen.Bounds().Min, draw.Src)
|
|
r.gif.Image[r.currentFrame] = img
|
|
// The actual FPS is 60, but GIF can't have such FPS. Set 50 FPS instead.
|
|
r.gif.Delay[r.currentFrame] = 2
|
|
|
|
r.currentFrame++
|
|
if r.currentFrame == len(r.gif.Image) {
|
|
if err := gif.EncodeAll(r.writer, r.gif); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RecordScreenAsGIF returns updating function with recording the screen as an animation GIF image.
|
|
//
|
|
// This encodes each screen at each frame and may slows the application.
|
|
func RecordScreenAsGIF(update func(*ebiten.Image) error, out io.Writer, frameNum int) func(*ebiten.Image) error {
|
|
r := &recorder{
|
|
inner: update,
|
|
writer: out,
|
|
gif: &gif.GIF{
|
|
Image: make([]*image.Paletted, frameNum),
|
|
Delay: make([]int, frameNum),
|
|
LoopCount: -1,
|
|
},
|
|
}
|
|
return r.update
|
|
}
|