func NewScreenFramebufferImage(width, height int) (*Image, error) {
img, err := graphics.NewScreenFramebufferImage(width, height)
if err != nil {
return nil, err
}
return &Image{
image: img,
volatile: true,
screen: true,
}, nil
}
// RestoreImage restores *graphics.Image from the pixels using its state.
func (p *Image) Restore(context *opengl.Context) error {
w, h := p.image.Size()
if p.screen {
// The screen image should also be recreated because framebuffer might
// be changed.
var err error
p.image, err = graphics.NewScreenFramebufferImage(w, h)
if err != nil {
return err
}
p.basePixels = nil
p.baseColor = color.RGBA{}
p.drawImageHistory = nil
p.stale = false
return nil
}
if p.volatile {
var err error
p.image, err = graphics.NewImage(w, h, p.filter)
if err != nil {
return err
}
p.basePixels = nil
p.baseColor = color.RGBA{}
p.drawImageHistory = nil
p.stale = false
return nil
}
if p.stale {
return errors.New("restorable: pixels must not be stale when restoring")
}
img := image.NewRGBA(image.Rect(0, 0, graphics.NextPowerOf2Int(w), graphics.NextPowerOf2Int(h)))
if p.basePixels != nil {
for j := 0; j < h; j++ {
copy(img.Pix[j*img.Stride:], p.basePixels[j*w*4:(j+1)*w*4])
}
}
gimg, err := graphics.NewImageFromImage(img, w, h, p.filter)
if err != nil {
return err
}
if p.baseColor != (color.RGBA{}) {
if p.basePixels != nil {
panic("not reach")
}
if err := gimg.Fill(p.baseColor); err != nil {
return err
}
}
for _, c := range p.drawImageHistory {
// c.image.impl must be already restored.
/*if c.image.impl.hasHistory() {
panic("not reach")
}*/
if err := gimg.DrawImage(c.image, c.vertices, c.colorm, c.mode); err != nil {
return err
}
}
p.image = gimg
p.basePixels, err = gimg.Pixels(context)
if err != nil {
return err
}
p.baseColor = color.RGBA{}
p.drawImageHistory = nil
p.stale = false
return nil
}