crunchy-rocks/draw2d
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convert uint16 into float64

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This commit is contained in:
Laurent Le Goff 2011-04-14 15:00:34 +02:00
parent 99bb7412b8
commit 9ae0038d00
1 changed files with 11 additions and 12 deletions
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23
draw2d/rgba_interpolation.go
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@ -56,11 +56,11 @@ func getColorCubicRow(img image.Image, x, y, offset float64) image.Color {
c1 := img.At(int(x+1), int(y)) c1 := img.At(int(x+1), int(y))
c2 := img.At(int(x+2), int(y)) c2 := img.At(int(x+2), int(y))
c3 := img.At(int(x+3), int(y)) c3 := img.At(int(x+3), int(y))
r0, g0, b0, a0 := c0.RGBA() rt, gt, bt, at := c0.RGBA(); r0, g0, b0, a0 := float64(rt), float64(gt), float64(bt), float64(at)
r1, g1, b1, a1 := c1.RGBA() rt, gt, bt, at = c1.RGBA(); r1, g1, b1, a1 := float64(rt), float64(gt), float64(bt), float64(at)
r2, g2, b2, a2 := c2.RGBA() rt, gt, bt, at = c2.RGBA(); r2, g2, b2, a2 := float64(rt), float64(gt), float64(bt), float64(at)
r3, g3, b3, a3 := c3.RGBA() rt, gt, bt, at = c3.RGBA(); r3, g3, b3, a3 := float64(rt), float64(gt), float64(bt), float64(at)
r, g, b, a := cubic(offset, float64(r0), float64(r1), float64(r2), float64(r3)), cubic(offset, float64(g0), float64(g1), float64(g2), float64(g3)), cubic(offset, float64(b0), float64(b1), float64(b2), float64(b3)), cubic(offset, float64(a0), float64(a1), float64(a2), float64(a3)) r, g, b, a := cubic(offset, r0, r1, r2, r3), cubic(offset, g0, g1, g2, g3), cubic(offset, b0, b1, b2, b3), cubic(offset, a0, a1, a2, a3)
return image.RGBAColor{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)} return image.RGBAColor{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)}
} }
@ -69,16 +69,15 @@ func getColorBicubic(img image.Image, x, y float64) image.Color {
y0 := math.Floor(y) y0 := math.Floor(y)
dx := x - x0 dx := x - x0
dy := y - y0 dy := y - y0
c0 := getColorCubicRow(img, x0-1, y0-1, dx) c0 := getColorCubicRow(img, x0-1, y0-1, dx)
c1 := getColorCubicRow(img, x0-1, y0, dx) c1 := getColorCubicRow(img, x0-1, y0, dx)
c2 := getColorCubicRow(img, x0-1, y0+1, dx) c2 := getColorCubicRow(img, x0-1, y0+1, dx)
c3 := getColorCubicRow(img, x0-1, y0+2, dx) c3 := getColorCubicRow(img, x0-1, y0+2, dx)
r0, g0, b0, a0 := c0.RGBA() rt, gt, bt, at := c0.RGBA(); r0, g0, b0, a0 := float64(rt), float64(gt), float64(bt), float64(at)
r1, g1, b1, a1 := c1.RGBA() rt, gt, bt, at = c1.RGBA(); r1, g1, b1, a1 := float64(rt), float64(gt), float64(bt), float64(at)
r2, g2, b2, a2 := c2.RGBA() rt, gt, bt, at = c2.RGBA(); r2, g2, b2, a2 := float64(rt), float64(gt), float64(bt), float64(at)
r3, g3, b3, a3 := c3.RGBA() rt, gt, bt, at = c3.RGBA(); r3, g3, b3, a3 := float64(rt), float64(gt), float64(bt), float64(at)
r, g, b, a := cubic(dy, float64(r0), float64(r1), float64(r2), float64(r3)), cubic(dy, float64(g0), float64(g1), float64(g2), float64(g3)), cubic(dy, float64(b0), float64(b1), float64(b2), float64(b3)), cubic(dy, float64(a0), float64(a1), float64(a2), float64(a3)) r, g, b, a := cubic(dy, r0, r1, r2, r3), cubic(dy, g0, g1, g2, g3), cubic(dy, b0, b1, b2, b3), cubic(dy, a0, a1, a2, a3)
return image.RGBAColor{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)} return image.RGBAColor{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)}
} }
@ -115,7 +114,7 @@ func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op,
var c2 image.Color var c2 image.Color
switch filter { switch filter {
case LinearFilter: case LinearFilter:
c2 = getColorLinear(src, u, v) c2 = src.At(int(u), int(v))
case BilinearFilter: case BilinearFilter:
c2 = getColorBilinear(src, u, v) c2 = getColorBilinear(src, u, v)
case BicubicFilter: case BicubicFilter: