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go-opengl-pixel
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make PictureData.Offset exported

This commit is contained in:
faiface 2017-03-20 23:08:36 +01:00
parent 4c526867a4
commit b4adc875d8
1 changed files with 6 additions and 5 deletions
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11
data.go
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@ -237,7 +237,7 @@ func (pd *PictureData) Image() *image.NRGBA {
i := 0 i := 0
for y := bounds.Min.Y; y < bounds.Max.Y; y++ { for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ { for x := bounds.Min.X; x < bounds.Max.X; x++ {
off := pd.offset(V(float64(x), float64(y))) off := pd.Offset(V(float64(x), float64(y)))
nrgba.Pix[i*4+0] = pd.Pix[off].R nrgba.Pix[i*4+0] = pd.Pix[off].R
nrgba.Pix[i*4+1] = pd.Pix[off].G nrgba.Pix[i*4+1] = pd.Pix[off].G
nrgba.Pix[i*4+2] = pd.Pix[off].B nrgba.Pix[i*4+2] = pd.Pix[off].B
@ -251,7 +251,8 @@ func (pd *PictureData) Image() *image.NRGBA {
return nrgba return nrgba
} }
func (pd *PictureData) offset(at Vec) int { // Offset returns the index of the pixel at the specified position inside the Pix slice.
func (pd *PictureData) Offset(at Vec) int {
at -= pd.Rect.Min.Map(math.Floor) at -= pd.Rect.Min.Map(math.Floor)
x, y := int(at.X()), int(at.Y()) x, y := int(at.X()), int(at.Y())
return y*pd.Stride + x return y*pd.Stride + x
@ -265,7 +266,7 @@ func (pd *PictureData) Bounds() Rect {
// Slice returns a sub-Picture of this PictureData inside the supplied rectangle. // Slice returns a sub-Picture of this PictureData inside the supplied rectangle.
func (pd *PictureData) Slice(r Rect) Picture { func (pd *PictureData) Slice(r Rect) Picture {
return &PictureData{ return &PictureData{
Pix: pd.Pix[pd.offset(r.Min):], Pix: pd.Pix[pd.Offset(r.Min):],
Stride: pd.Stride, Stride: pd.Stride,
Rect: r, Rect: r,
Orig: pd.Orig, Orig: pd.Orig,
@ -283,7 +284,7 @@ func (pd *PictureData) Color(at Vec) NRGBA {
if !pd.Rect.Contains(at) { if !pd.Rect.Contains(at) {
return NRGBA{0, 0, 0, 0} return NRGBA{0, 0, 0, 0}
} }
return NRGBAModel.Convert(pd.Pix[pd.offset(at)]).(NRGBA) return NRGBAModel.Convert(pd.Pix[pd.Offset(at)]).(NRGBA)
} }
// SetColor changes the color located at the given position. // SetColor changes the color located at the given position.
@ -291,5 +292,5 @@ func (pd *PictureData) SetColor(at Vec, col color.Color) {
if !pd.Rect.Contains(at) { if !pd.Rect.Contains(at) {
return return
} }
pd.Pix[pd.offset(at)] = color.NRGBAModel.Convert(col).(color.NRGBA) pd.Pix[pd.Offset(at)] = color.NRGBAModel.Convert(col).(color.NRGBA)
} }