aw/go-resize
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This commit is contained in:
Eugene Zagidullin 2016-01-07 18:38:35 +02:00 committed by nfnt
parent 5311ab3c51
commit 9780a95734
1 changed files with 63 additions and 16 deletions
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77
converter.go
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@ -76,14 +76,23 @@ func resizeGeneric(in image.Image, out *image.NRGBA64, scale float64, coeffs []i
offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8 offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
// Reverse alpha-premultiplication // Reverse alpha-premultiplication
r := rgba[0] / sum
g := rgba[1] / sum
b := rgba[2] / sum
a := rgba[3] / sum a := rgba[3] / sum
value := clampUint16(rgba[0] * 0xffff / a / sum)
if a != 0 {
r = r * 0xffff / a
g = g * 0xffff / a
b = b * 0xffff / a
}
value := clampUint16(r)
out.Pix[offset+0] = uint8(value >> 8) out.Pix[offset+0] = uint8(value >> 8)
out.Pix[offset+1] = uint8(value) out.Pix[offset+1] = uint8(value)
value = clampUint16(rgba[1] * 0xffff / a / sum) value = clampUint16(g)
out.Pix[offset+2] = uint8(value >> 8) out.Pix[offset+2] = uint8(value >> 8)
out.Pix[offset+3] = uint8(value) out.Pix[offset+3] = uint8(value)
value = clampUint16(rgba[2] * 0xffff / a / sum) value = clampUint16(b)
out.Pix[offset+4] = uint8(value >> 8) out.Pix[offset+4] = uint8(value >> 8)
out.Pix[offset+5] = uint8(value) out.Pix[offset+5] = uint8(value)
value = clampUint16(a) value = clampUint16(a)
@ -127,10 +136,20 @@ func resizeRGBA(in *image.RGBA, out *image.NRGBA, scale float64, coeffs []int16,
xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4 xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
// Reverse alpha-premultiplication // Reverse alpha-premultiplication
r := rgba[0] / sum
g := rgba[1] / sum
b := rgba[2] / sum
a := rgba[3] / sum a := rgba[3] / sum
out.Pix[xo+0] = clampUint8(rgba[0] * 0xff / a / sum)
out.Pix[xo+1] = clampUint8(rgba[1] * 0xff / a / sum) if a != 0 {
out.Pix[xo+2] = clampUint8(rgba[2] * 0xff / a / sum) r = r * 0xff / a
g = g * 0xff / a
b = b * 0xff / a
}
out.Pix[xo+0] = clampUint8(r)
out.Pix[xo+1] = clampUint8(g)
out.Pix[xo+2] = clampUint8(b)
out.Pix[xo+3] = clampUint8(a) out.Pix[xo+3] = clampUint8(a)
} }
} }
@ -172,10 +191,20 @@ func resizeNRGBA(in *image.NRGBA, out *image.NRGBA, scale float64, coeffs []int1
xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4 xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
// Reverse alpha-premultiplication // Reverse alpha-premultiplication
r := rgba[0] / sum
g := rgba[1] / sum
b := rgba[2] / sum
a := rgba[3] / sum a := rgba[3] / sum
out.Pix[xo+0] = clampUint8(rgba[0] * 0xff / a / sum)
out.Pix[xo+1] = clampUint8(rgba[1] * 0xff / a / sum) if a != 0 {
out.Pix[xo+2] = clampUint8(rgba[2] * 0xff / a / sum) r = r * 0xff / a
g = g * 0xff / a
b = b * 0xff / a
}
out.Pix[xo+0] = clampUint8(r)
out.Pix[xo+1] = clampUint8(g)
out.Pix[xo+2] = clampUint8(b)
out.Pix[xo+3] = clampUint8(a) out.Pix[xo+3] = clampUint8(a)
} }
} }
@ -215,14 +244,23 @@ func resizeRGBA64(in *image.RGBA64, out *image.NRGBA64, scale float64, coeffs []
xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8 xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
// Reverse alpha-premultiplication // Reverse alpha-premultiplication
r := rgba[0] / sum
g := rgba[1] / sum
b := rgba[2] / sum
a := rgba[3] / sum a := rgba[3] / sum
value := clampUint16(rgba[0] * 0xffff / a / sum)
if a != 0 {
r = r * 0xffff / a
g = g * 0xffff / a
b = b * 0xffff / a
}
value := clampUint16(r)
out.Pix[xo+0] = uint8(value >> 8) out.Pix[xo+0] = uint8(value >> 8)
out.Pix[xo+1] = uint8(value) out.Pix[xo+1] = uint8(value)
value = clampUint16(rgba[1] * 0xffff / a / sum) value = clampUint16(g)
out.Pix[xo+2] = uint8(value >> 8) out.Pix[xo+2] = uint8(value >> 8)
out.Pix[xo+3] = uint8(value) out.Pix[xo+3] = uint8(value)
value = clampUint16(rgba[2] * 0xffff / a / sum) value = clampUint16(b)
out.Pix[xo+4] = uint8(value >> 8) out.Pix[xo+4] = uint8(value >> 8)
out.Pix[xo+5] = uint8(value) out.Pix[xo+5] = uint8(value)
value = clampUint16(a) value = clampUint16(a)
@ -268,14 +306,23 @@ func resizeNRGBA64(in *image.NRGBA64, out *image.NRGBA64, scale float64, coeffs
xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8 xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
// Reverse alpha-premultiplication // Reverse alpha-premultiplication
r := rgba[0] / sum
g := rgba[1] / sum
b := rgba[2] / sum
a := rgba[3] / sum a := rgba[3] / sum
value := clampUint16(rgba[0] * 0xffff / a / sum)
if a != 0 {
r = r * 0xffff / a
g = g * 0xffff / a
b = b * 0xffff / a
}
value := clampUint16(r)
out.Pix[xo+0] = uint8(value >> 8) out.Pix[xo+0] = uint8(value >> 8)
out.Pix[xo+1] = uint8(value) out.Pix[xo+1] = uint8(value)
value = clampUint16(rgba[1] * 0xffff / a / sum) value = clampUint16(g)
out.Pix[xo+2] = uint8(value >> 8) out.Pix[xo+2] = uint8(value >> 8)
out.Pix[xo+3] = uint8(value) out.Pix[xo+3] = uint8(value)
value = clampUint16(rgba[2] * 0xffff / a / sum) value = clampUint16(b)
out.Pix[xo+4] = uint8(value >> 8) out.Pix[xo+4] = uint8(value >> 8)
out.Pix[xo+5] = uint8(value) out.Pix[xo+5] = uint8(value)
value = clampUint16(a) value = clampUint16(a)