mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ebitenutil
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import (
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"github.com/hajimehoshi/ebiten"
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"image"
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"image/color/palette"
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"image/draw"
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"image/gif"
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"io"
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)
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type recorder struct {
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inner func(screen *ebiten.Image) error
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writer io.Writer
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gif *gif.GIF
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currentFrame int
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}
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func (r *recorder) update(screen *ebiten.Image) error {
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if err := r.inner(screen); err != nil {
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return err
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}
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if r.currentFrame == len(r.gif.Image) {
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return nil
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}
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img := image.NewPaletted(screen.Bounds(), palette.Plan9)
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// TODO: This is too slow.
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draw.Draw(img, img.Bounds(), screen, screen.Bounds().Min, draw.Src)
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r.gif.Image[r.currentFrame] = img
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// The actual FPS is 60, but GIF can't have such FPS. Set 50 FPS instead.
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r.gif.Delay[r.currentFrame] = 2
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r.currentFrame++
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if r.currentFrame == len(r.gif.Image) {
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if err := gif.EncodeAll(r.writer, r.gif); err != nil {
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return err
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}
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}
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return nil
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}
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// RecordScreenAsGIF returns updating function with recording the screen as an animation GIF image.
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//
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// This encodes each screen at each frame and may slows the application.
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func RecordScreenAsGIF(update func(*ebiten.Image) error, out io.Writer, frameNum int) func(*ebiten.Image) error {
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r := &recorder{
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inner: update,
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writer: out,
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gif: &gif.GIF{
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Image: make([]*image.Paletted, frameNum),
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Delay: make([]int, frameNum),
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LoopCount: -1,
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},
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}
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return r.update
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}
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