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graphics: Refactoring

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This commit is contained in:
Hajime Hoshi 2016-07-14 03:29:19 +09:00
parent dee602e792
commit ea285afb96
1 changed files with 17 additions and 13 deletions
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30
pixels.go
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@ -31,28 +31,28 @@ type drawImageHistoryItem struct {
}
type pixels struct {
pixels []uint8
basePixels []uint8
baseColor color.Color
drawImageHistory []*drawImageHistoryItem
}
func (p *pixels) resetWithPixels(pixels []uint8) {
if p.pixels == nil {
p.pixels = make([]uint8, len(pixels))
if p.basePixels == nil {
p.basePixels = make([]uint8, len(pixels))
}
copy(p.pixels, pixels)
copy(p.basePixels, pixels)
p.baseColor = nil
p.drawImageHistory = nil
}
func (p *pixels) clear() {
p.pixels = nil
p.basePixels = nil
p.baseColor = nil
p.drawImageHistory = nil
}
func (p *pixels) fill(clr color.Color) {
p.pixels = nil
p.basePixels = nil
p.baseColor = clr
p.drawImageHistory = nil
}
@ -62,16 +62,16 @@ func (p *pixels) appendDrawImageHistory(item *drawImageHistoryItem) {
}
func (p *pixels) at(image *graphics.Image, idx int, context *opengl.Context) (color.Color, error) {
if p.pixels == nil || p.drawImageHistory != nil {
if p.basePixels == nil || p.drawImageHistory != nil {
var err error
p.pixels, err = image.Pixels(context)
p.basePixels, err = image.Pixels(context)
if err != nil {
return nil, err
}
p.baseColor = nil
p.drawImageHistory = nil
}
r, g, b, a := p.pixels[idx], p.pixels[idx+1], p.pixels[idx+2], p.pixels[idx+3]
r, g, b, a := p.basePixels[idx], p.basePixels[idx+1], p.basePixels[idx+2], p.basePixels[idx+3]
return color.RGBA{r, g, b, a}, nil
}
@ -92,7 +92,7 @@ func (p *pixels) resetHistoryIfNeeded(image *graphics.Image, target *Image, cont
return nil
}
var err error
p.pixels, err = image.Pixels(context)
p.basePixels, err = image.Pixels(context)
if err != nil {
return err
}
@ -105,11 +105,14 @@ func (p *pixels) hasHistory() bool {
return p.drawImageHistory != nil
}
// restore restores the pixels using its history.
//
// restore is the only function that the pixel data is not present on GPU when this is called.
func (p *pixels) restore(context *opengl.Context, width, height int, filter Filter) (*graphics.Image, error) {
img := image.NewRGBA(image.Rect(0, 0, width, height))
if p.pixels != nil {
if p.basePixels != nil {
for j := 0; j < height; j++ {
copy(img.Pix[j*img.Stride:], p.pixels[j*width*4:(j+1)*width*4])
copy(img.Pix[j*img.Stride:], p.basePixels[j*width*4:(j+1)*width*4])
}
} else if p.baseColor != nil {
r32, g32, b32, a32 := p.baseColor.RGBA()
@ -126,6 +129,7 @@ func (p *pixels) restore(context *opengl.Context, width, height int, filter Filt
return nil, err
}
for _, c := range p.drawImageHistory {
// c.image.impl must be already restored.
if c.image.impl.hasHistory() {
panic("not reach")
}
@ -133,7 +137,7 @@ func (p *pixels) restore(context *opengl.Context, width, height int, filter Filt
return nil, err
}
}
p.pixels, err = gimg.Pixels(context)
p.basePixels, err = gimg.Pixels(context)
if err != nil {
return nil, err
}