mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
140 lines
3.3 KiB
Go
140 lines
3.3 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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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"
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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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"sync"
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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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frameNum int
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skips int
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gif *gif.GIF
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currentFrame int
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wg sync.WaitGroup
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}
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var cheapPalette color.Palette
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func init() {
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cs := []color.Color{}
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for _, r := range []uint8{0x00, 0x80, 0xff} {
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for _, g := range []uint8{0x00, 0x80, 0xff} {
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for _, b := range []uint8{0x00, 0x80, 0xff} {
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cs = append(cs, color.RGBA{r, g, b, 0xff})
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}
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}
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}
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cheapPalette = color.Palette(cs)
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}
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func (r *recorder) delay() int {
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delay := 100 * r.skips / ebiten.FPS
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if delay < 2 {
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return 2
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}
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return delay
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}
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func (r *recorder) palette() color.Palette {
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if 1 < (r.frameNum-1)/r.skips+1 {
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return cheapPalette
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}
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return palette.Plan9
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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 == r.frameNum {
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return nil
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}
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if r.currentFrame%r.skips == 0 {
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if r.gif == nil {
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num := (r.frameNum-1)/r.skips + 1
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r.gif = &gif.GIF{
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Image: make([]*image.Paletted, num),
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Delay: make([]int, num),
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LoopCount: -1,
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}
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}
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s := image.NewNRGBA(screen.Bounds())
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draw.Draw(s, s.Bounds(), screen, screen.Bounds().Min, draw.Src)
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img := image.NewPaletted(s.Bounds(), r.palette())
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f := r.currentFrame / r.skips
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r.wg.Add(1)
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go func() {
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defer r.wg.Done()
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draw.FloydSteinberg.Draw(img, img.Bounds(), s, s.Bounds().Min)
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r.gif.Image[f] = img
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r.gif.Delay[f] = r.delay()
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}()
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}
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r.currentFrame++
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if r.currentFrame == r.frameNum {
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r.wg.Wait()
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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 is deprecated as of version 1.6.0-alpha.
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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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//
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// Here is the example to record initial 120 frames of your game:
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//
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// func update(screen *ebiten.Image) error {
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// // ...
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// }
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//
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// func main() {
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// out, err := os.Create("output.gif")
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// if err != nil {
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// log.Fatal(err)
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// }
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// defer out.Close()
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//
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// update := RecordScreenAsGIF(update, out, 120)
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// if err := ebiten.Run(update, 320, 240, 2, "Your game's title"); err != nil {
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// log.Fatal(err)
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// }
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// }
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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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frameNum: frameNum,
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skips: 10,
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}
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return r.update
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}
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