// Interpolate 4 interleaved uint8 per pixel images.
func interpolate4x8(src *image.NRGBA, dstW, dstH int) image.Image {
srcRect := src.Bounds()
srcW := srcRect.Dx()
srcH := srcRect.Dy()
ww, hh := uint64(dstW), uint64(dstH)
dx, dy := uint64(srcW), uint64(srcH)
n, sum := dx*dy, make([]uint64, 4*dstW*dstH)
for y := 0; y < srcH; y++ {
pixOffset := src.PixOffset(0, y)
for x := 0; x < srcW; x++ {
// Get the source pixel.
r64 := uint64(src.Pix[pixOffset+0])
g64 := uint64(src.Pix[pixOffset+1])
b64 := uint64(src.Pix[pixOffset+2])
a64 := uint64(src.Pix[pixOffset+3])
pixOffset += 4
// Spread the source pixel over 1 or more destination rows.
py := uint64(y) * hh
for remy := hh; remy > 0; {
qy := dy - (py % dy)
if qy > remy {
qy = remy
}
// Spread the source pixel over 1 or more destination columns.
px := uint64(x) * ww
index := 4 * ((py/dy)*ww + (px / dx))
for remx := ww; remx > 0; {
qx := dx - (px % dx)
if qx > remx {
qx = remx
}
qxy := qx * qy
sum[index+0] += r64 * qxy
sum[index+1] += g64 * qxy
sum[index+2] += b64 * qxy
sum[index+3] += a64 * qxy
index += 4
px += qx
remx -= qx
}
py += qy
remy -= qy
}
}
}
dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH))
for y := 0; y < dstH; y++ {
pixOffset := dst.PixOffset(0, y)
for x := 0; x < dstW; x++ {
dst.Pix[pixOffset+0] = uint8(sum[pixOffset+0] / n)
dst.Pix[pixOffset+1] = uint8(sum[pixOffset+1] / n)
dst.Pix[pixOffset+2] = uint8(sum[pixOffset+2] / n)
dst.Pix[pixOffset+3] = uint8(sum[pixOffset+3] / n)
pixOffset += 4
}
}
return dst
}
// render one row of pixels by calculating a colour for each pixel.
// The image pixel row number is r. Fill the pixel colour into the
// image after the colour has been calculated.
func (r row) render(rt *rtrace, a, b, c lin.V3, img *image.NRGBA, seed *uint32) {
rgba := color.NRGBA{0, 0, 0, 255}
t, v1, v2 := lin.NewV3(), lin.NewV3(), lin.NewV3() // temp vectors.
colour, orig, dir := lin.NewV3(), lin.NewV3(), lin.NewV3()
for x := (rt.iw - 1); x >= 0; x-- {
colour.SetS(13, 13, 13) // Use a very dark default colour.
// Cast 64 rays per pixel for blur (stochastic sampling) and soft-shadows.
for cnt := 0; cnt < 64; cnt++ {
// Add randomness to the camera origin 17,16,8
t.Scale(&a, rnd(seed)-0.5).Scale(t, 99).Add(t, v1.Scale(&b, rnd(seed)-0.5).Scale(v1, 99))
orig.SetS(17, 16, 8).Add(orig, t)
// Add randomness to the camera direction.
rnda := rnd(seed) + float64(x)
rndb := float64(r) + rnd(seed)
dir.Scale(t, -1)
dir.Add(dir, v1.Scale(&a, rnda).Add(v1, v2.Scale(&b, rndb)).Add(v1, &c).Scale(v1, 16))
dir.Unit()
// accumulate the colour from each of the 64 rays.
sample := rt.sample(*orig, *dir, seed)
colour = sample.Scale(&sample, 3.5).Add(&sample, colour)
}
// set the final pixel colour in the image.
rgba.R = byte(colour.X) // red
rgba.G = byte(colour.Y) // green
rgba.B = byte(colour.Z) // blue
img.SetNRGBA(rt.iw-x, int(r), rgba)
}
}
func useChunk(chunk *Chunk, img *image.NRGBA, xoffset, zoffset int) error {
var r, openErr = chunk.Open()
if openErr != nil {
return openErr
}
defer r.Close()
var c, nbtErr = nbt.ReadChunkNbt(r)
if nbtErr != nil {
return nbtErr
}
blocks := Blocks(c.Blocks)
for x := 0; x < 16; x++ {
for z := 0; z < 16; z++ {
column := blocks.Column(x, z)
v := uint16(0)
for y := 127; y > 0; y-- {
if column[y] != 0 {
v = column[y]
break
}
}
//fmt.Printf("%7x", color[v&0xff])
img.Set(xoffset+x, zoffset+z, rgb(color[v&0xff]))
//fmt.Printf("%7x", img.At(x, z))
}
//fmt.Println()
}
//fmt.Println()
return nil
}
func Resized(ext string, data []byte, width, height int) (resized []byte, w int, h int) {
if width == 0 && height == 0 {
return data, 0, 0
}
srcImage, _, err := image.Decode(bytes.NewReader(data))
if err == nil {
bounds := srcImage.Bounds()
var dstImage *image.NRGBA
if bounds.Dx() > width && width != 0 || bounds.Dy() > height && height != 0 {
if width == height && bounds.Dx() != bounds.Dy() {
dstImage = imaging.Thumbnail(srcImage, width, height, imaging.Lanczos)
w, h = width, height
} else {
dstImage = imaging.Resize(srcImage, width, height, imaging.Lanczos)
}
} else {
return data, bounds.Dx(), bounds.Dy()
}
var buf bytes.Buffer
switch ext {
case ".png":
png.Encode(&buf, dstImage)
case ".jpg", ".jpeg":
jpeg.Encode(&buf, dstImage, nil)
case ".gif":
gif.Encode(&buf, dstImage, nil)
}
return buf.Bytes(), dstImage.Bounds().Dx(), dstImage.Bounds().Dy()
} else {
glog.Error(err)
}
return data, 0, 0
}
func drawRect(img *image.NRGBA, r image.Rectangle, c color.Color) {
for i := r.Min.X; i <= r.Max.X; i++ {
for j := r.Min.Y; j <= r.Max.Y; j++ {
img.Set(i, j, c)
}
}
}
func uploadTexture_NRGBA32(img *image.NRGBA) gl.Texture {
b := img.Bounds()
data := make([]uint8, b.Max.X*b.Max.Y*4)
for y := 0; y < b.Max.Y; y++ {
for x := 0; x < b.Max.X; x++ {
p := img.At(x, y)
offset := y*b.Max.X*4 + x*4
r, g, b, a := p.RGBA()
data[offset+0] = uint8(r)
data[offset+1] = uint8(g)
data[offset+2] = uint8(b)
data[offset+3] = uint8(a)
}
}
id := gl.GenTexture()
id.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, b.Max.X, b.Max.Y, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
if gl.GetError() != gl.NO_ERROR {
id.Delete()
panic(errors.New("Failed to load a texture"))
return 0
}
return id
}
func Resize(context *common.AppContext, source *image.NRGBA, width, height int) *image.NRGBA {
//Naive nn resize.
destinationW, destinationH := width, height
sourceBounds := source.Bounds()
sourceW := sourceBounds.Max.X
sourceH := sourceBounds.Max.Y
destination := image.NewNRGBA(image.Rect(0, 0, destinationW, destinationH))
dx := float64(sourceW) / float64(destinationW)
dy := float64(sourceH) / float64(destinationH)
for destinationY := 0; destinationY < destinationH; destinationY++ {
fy := (float64(destinationY)+0.5)*dy - 0.5
for destinationX := 0; destinationX < destinationW; destinationX++ {
fx := (float64(destinationX)+0.5)*dx - 0.5
sourceX := int(math.Min(math.Max(math.Floor(fx+0.5), 0.0), float64(sourceW)))
sourceY := int(math.Min(math.Max(math.Floor(fy+0.5), 0.0), float64(sourceH)))
sourceOff := sourceY*source.Stride + sourceX*4
destinationOff := destinationY*destination.Stride + destinationX*4
copy(destination.Pix[destinationOff:destinationOff+4], source.Pix[sourceOff:sourceOff+4])
}
}
return destination
}
func resizeHorizontal(src *image.NRGBA, width int, filter ResampleFilter) *image.NRGBA {
srcBounds := src.Bounds()
srcW := srcBounds.Max.X
srcH := srcBounds.Max.Y
dstW := width
dstH := srcH
dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH))
weights := precomputeWeights(dstW, srcW, filter)
parallel(dstH, func(partStart, partEnd int) {
for dstY := partStart; dstY < partEnd; dstY++ {
for dstX := 0; dstX < dstW; dstX++ {
var c [4]int32
for _, iw := range weights[dstX].iwpairs {
i := dstY*src.Stride + iw.i*4
c[0] += int32(src.Pix[i+0]) * iw.w
c[1] += int32(src.Pix[i+1]) * iw.w
c[2] += int32(src.Pix[i+2]) * iw.w
c[3] += int32(src.Pix[i+3]) * iw.w
}
j := dstY*dst.Stride + dstX*4
sum := weights[dstX].wsum
dst.Pix[j+0] = clampint32(int32(float32(c[0])/float32(sum) + 0.5))
dst.Pix[j+1] = clampint32(int32(float32(c[1])/float32(sum) + 0.5))
dst.Pix[j+2] = clampint32(int32(float32(c[2])/float32(sum) + 0.5))
dst.Pix[j+3] = clampint32(int32(float32(c[3])/float32(sum) + 0.5))
}
}
})
return dst
}
// fast nearest-neighbor resize, no filtering
func resizeNearest(src *image.NRGBA, width, height int) *image.NRGBA {
dstW, dstH := width, height
srcBounds := src.Bounds()
srcW := srcBounds.Max.X
srcH := srcBounds.Max.Y
dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH))
dx := float64(srcW) / float64(dstW)
dy := float64(srcH) / float64(dstH)
Parallel(dstH, func(partStart, partEnd int) {
for dstY := partStart; dstY < partEnd; dstY++ {
fy := (float64(dstY)+0.5)*dy - 0.5
for dstX := 0; dstX < dstW; dstX++ {
fx := (float64(dstX)+0.5)*dx - 0.5
srcX := int(math.Min(math.Max(math.Floor(fx+0.5), 0.0), float64(srcW)))
srcY := int(math.Min(math.Max(math.Floor(fy+0.5), 0.0), float64(srcH)))
srcOff := srcY*src.Stride + srcX*4
dstOff := dstY*dst.Stride + dstX*4
copy(dst.Pix[dstOff:dstOff+4], src.Pix[srcOff:srcOff+4])
}
}
})
return dst
}
func setPixel(i *image.NRGBA, x, y int) {
for zx := 1; zx < 9; zx++ {
for zy := 1; zy < 9; zy++ {
i.Set(x*10+zx, y*10+zy, color.RGBA{0, 0, 0, 255})
}
}
}
func uploadTexture_NRGBA32(img *image.NRGBA) gl.Texture {
b := img.Bounds()
data := make([]uint8, b.Max.X*b.Max.Y*4)
for y := 0; y < b.Max.Y; y++ {
for x := 0; x < b.Max.X; x++ {
p := &img.Pix[y*img.Stride+x]
offset := y*b.Max.X*4 + x*4
data[offset+0] = p.R
data[offset+1] = p.G
data[offset+2] = p.B
data[offset+3] = p.A
}
}
id := gl.GenTexture()
id.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, b.Max.X, b.Max.Y, 0, gl.RGBA, data)
if gl.GetError() != gl.NO_ERROR {
id.Delete()
panic(os.NewError("Failed to load a texture"))
return 0
}
return id
}
func cutImage(img *image.NRGBA) []*image.NRGBA {
r := image.Rect(0, 0, 6, 11)
cuts := make([]*image.NRGBA, 10)
for i := 0; i < 10; i++ {
cuts[i] = img.SubImage(r).(*image.NRGBA)
r = r.Add(image.Pt(7, 0))
}
return cuts
}
func newSetFuncNRGBA(p *image.NRGBA) SetFunc {
return func(x, y int, r, g, b, a uint32) {
r, g, b, a = RGBAToNRGBA(r, g, b, a)
i := p.PixOffset(x, y)
p.Pix[i+0] = uint8(r >> 8)
p.Pix[i+1] = uint8(g >> 8)
p.Pix[i+2] = uint8(b >> 8)
p.Pix[i+3] = uint8(a >> 8)
}
}
func resizeRGBA(in *image.RGBA, out *image.NRGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
newBounds := out.Bounds()
maxX := in.Bounds().Dx() - 1
for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
row := in.Pix[x*in.Stride:]
for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
var rgba [4]int32
var sum int32
start := offset[y]
ci := y * filterLength
for i := 0; i < filterLength; i++ {
coeff := coeffs[ci+i]
if coeff != 0 {
xi := start + i
switch {
case uint(xi) < uint(maxX):
xi *= 4
case xi >= maxX:
xi = 4 * maxX
default:
xi = 0
}
r := uint32(row[xi+0])
g := uint32(row[xi+1])
b := uint32(row[xi+2])
a := uint32(row[xi+3])
// reverse alpha-premultiplication.
if a != 0 {
r *= 0xffff
r /= a
g *= 0xffff
g /= a
b *= 0xffff
b /= a
}
rgba[0] += int32(coeff) * int32(r)
rgba[1] += int32(coeff) * int32(g)
rgba[2] += int32(coeff) * int32(b)
rgba[3] += int32(coeff) * int32(a)
sum += int32(coeff)
}
}
xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
out.Pix[xo+0] = clampUint8(rgba[0] / sum)
out.Pix[xo+1] = clampUint8(rgba[1] / sum)
out.Pix[xo+2] = clampUint8(rgba[2] / sum)
out.Pix[xo+3] = clampUint8(rgba[3] / sum)
}
}
}
func blurVertical(src *image.NRGBA, kernel []float64) *image.NRGBA {
radius := len(kernel) - 1
width := src.Bounds().Max.X
height := src.Bounds().Max.Y
dst := image.NewNRGBA(image.Rect(0, 0, width, height))
parallel(height, func(partStart, partEnd int) {
for y := partStart; y < partEnd; y++ {
start := y - radius
if start < 0 {
start = 0
}
end := y + radius
if end > height-1 {
end = height - 1
}
weightSum := 0.0
for iy := start; iy <= end; iy++ {
weightSum += kernel[absint(y-iy)]
}
for x := 0; x < width; x++ {
r, g, b, a := 0.0, 0.0, 0.0, 0.0
for iy := start; iy <= end; iy++ {
weight := kernel[absint(y-iy)]
i := iy*src.Stride + x*4
wa := float64(src.Pix[i+3]) * weight
r += float64(src.Pix[i+0]) * wa
g += float64(src.Pix[i+1]) * wa
b += float64(src.Pix[i+2]) * wa
a += wa
}
r = math.Min(math.Max(r/a, 0.0), 255.0)
g = math.Min(math.Max(g/a, 0.0), 255.0)
b = math.Min(math.Max(b/a, 0.0), 255.0)
a = math.Min(math.Max(a/weightSum, 0.0), 255.0)
j := y*dst.Stride + x*4
dst.Pix[j+0] = uint8(r + 0.5)
dst.Pix[j+1] = uint8(g + 0.5)
dst.Pix[j+2] = uint8(b + 0.5)
dst.Pix[j+3] = uint8(a + 0.5)
}
}
})
return dst
}
// Interpolate uint32/pixel images.
func interpolate1x32(src *image.NRGBA, dstW, dstH int) image.Image {
srcRect := src.Bounds()
srcW := srcRect.Dx()
srcH := srcRect.Dy()
ww, hh := uint64(dstW), uint64(dstH)
dx, dy := uint64(srcW), uint64(srcH)
n, sum := dx*dy, make([]uint64, dstW*dstH)
for y := 0; y < srcH; y++ {
pixOffset := src.PixOffset(0, y)
for x := 0; x < srcW; x++ {
// Get the source pixel.
val64 := uint64(binary.BigEndian.Uint32([]byte(src.Pix[pixOffset+0 : pixOffset+4])))
pixOffset += 4
// Spread the source pixel over 1 or more destination rows.
py := uint64(y) * hh
for remy := hh; remy > 0; {
qy := dy - (py % dy)
if qy > remy {
qy = remy
}
// Spread the source pixel over 1 or more destination columns.
px := uint64(x) * ww
index := (py/dy)*ww + (px / dx)
for remx := ww; remx > 0; {
qx := dx - (px % dx)
if qx > remx {
qx = remx
}
qxy := qx * qy
sum[index] += val64 * qxy
index++
px += qx
remx -= qx
}
py += qy
remy -= qy
}
}
}
dst := image.NewNRGBA(image.Rect(0, 0, dstW, dstH))
index := 0
for y := 0; y < dstH; y++ {
pixOffset := dst.PixOffset(0, y)
for x := 0; x < dstW; x++ {
binary.BigEndian.PutUint32(dst.Pix[pixOffset+0:pixOffset+4], uint32(sum[index]/n))
pixOffset += 4
index++
}
}
return dst
}
func DrawTextOnImage(text string, font *truetype.Font, img *image.NRGBA, size, x, y int) {
c := freetype.NewContext()
c.SetDPI(120)
c.SetFont(font)
c.SetFontSize(float64(size))
c.SetClip(img.Bounds())
c.SetDst(img)
c.SetSrc(image.Black)
pt := freetype.Pt(x, y+int(c.PointToFix32(float64(size))>>8))
c.DrawString(text, pt)
}
// MakeImage makes an image from an image.NRGBA.
func MakeImage(i *image.NRGBA) (img Image) {
img.Width, img.Height = i.Bounds().Dx(), i.Bounds().Dy()
img.tex = gl.GenTexture()
img.tex.Bind(gl.TEXTURE_2D)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, img.Width, img.Height,
0, gl.RGBA, gl.UNSIGNED_BYTE, i.Pix)
return
}
func blurHorizontal(src *image.NRGBA, kernel []float64) *image.NRGBA {
radius := len(kernel) - 1
width := src.Bounds().Max.X
height := src.Bounds().Max.Y
dst := image.NewNRGBA(image.Rect(0, 0, width, height))
parallel(width, func(partStart, partEnd int) {
for x := partStart; x < partEnd; x++ {
start := x - radius
if start < 0 {
start = 0
}
end := x + radius
if end > width-1 {
end = width - 1
}
weightSum := 0.0
for ix := start; ix <= end; ix++ {
weightSum += kernel[absint(x-ix)]
}
for y := 0; y < height; y++ {
r, g, b, a := 0.0, 0.0, 0.0, 0.0
for ix := start; ix <= end; ix++ {
weight := kernel[absint(x-ix)]
i := y*src.Stride + ix*4
r += float64(src.Pix[i+0]) * weight
g += float64(src.Pix[i+1]) * weight
b += float64(src.Pix[i+2]) * weight
a += float64(src.Pix[i+3]) * weight
}
r = math.Min(math.Max(r/weightSum, 0.0), 255.0)
g = math.Min(math.Max(g/weightSum, 0.0), 255.0)
b = math.Min(math.Max(b/weightSum, 0.0), 255.0)
a = math.Min(math.Max(a/weightSum, 0.0), 255.0)
j := y*dst.Stride + x*4
dst.Pix[j+0] = uint8(r + 0.5)
dst.Pix[j+1] = uint8(g + 0.5)
dst.Pix[j+2] = uint8(b + 0.5)
dst.Pix[j+3] = uint8(a + 0.5)
}
}
})
return dst
}
func render(img *image.NRGBA, startY, limitY int, c chan int) {
for y := startY; y < limitY; y++ {
for x := 0; x < img.Rect.Dx(); x++ {
p := vec.Vec3{float32(float32(x)/float32(img.Rect.Dx()-1) - 0.5),
float32(-(float32(y)/float32(img.Rect.Dy()-1) - 0.5)),
-float32(0.8)}
d := p.Normalized()
dist, obj := distanceFieldObject(p)
step := 0
for ; step < 63 && dist > -0.005*p.Z; step++ {
// Error decreases 1/d, so keep min step proportional to d for constant screen-space error
p = p.Add(d, math32.Maxf(-0.005*p.Z, dist))
if p.Z < -60 {
break
}
dist, obj = distanceFieldObject(p)
}
if dist <= -0.01*p.Z {
n := fieldNormalAt(distanceField, p)
// compute ambient occlusion before doing bump mapping
ao := math32.Minf(ambientOcclusion(p, n), 1.0)
dnoise := fieldNormalAt(noise.Fbm, p)
const N = 0.3
n = n.Vtrans(dnoise.Scale(N)).Normalized()
distfade := math32.Expf(0.07 * (p.Z + 6))
/*lit := float32(1.0)*/
lit := math32.Maxf(0, n.Z)
/*tex := float32(0.8)*/
tex := (0.4*(math32.Sinf(2*(p.X+1.4*p.Y)+2*noise.Fbm(p))+1) + 0.2)
v := tex * (lit*0.6 + 0.3) * (ao * ao * ao) * distfade
col := obj.Color()
img.Set(x, y, color.NRGBA{
/*uint8(math32.Minf(float32(step)*4+255*v, 255)),*/
uint8(255 * v * col[0]),
uint8(255 * v * col[1]),
uint8(255 * v * col[2]),
/*uint8(255*ao),*/
255})
} else {
/*img.Set(x, y, image.RGBAColor{uint8(step * 4), 0, 0, 255})*/
img.Set(x, y, color.NRGBA{0, 0, 0, 255})
}
}
}
c <- 1
}
func setPixelBytes(img image.NRGBA, pixel LsbPixel, byt byte) {
rgba := img.NRGBAAt(pixel.GetX(), pixel.GetY())
switch pixel.GetLayer() {
case "r":
rgba.R = byt
case "g":
rgba.G = byt
case "b":
rgba.B = byt
case "a":
rgba.A = byt
}
img.Set(pixel.GetX(), pixel.GetY(), rgba)
}
func getPixelBytes(img image.NRGBA, pixel LsbPixel) byte {
rgba := img.NRGBAAt(pixel.GetX(), pixel.GetY())
switch pixel.GetLayer() {
case "r":
return rgba.R
case "g":
return rgba.G
case "b":
return rgba.B
case "a":
return rgba.A
}
return 0
}
func Resize(src io.Reader, c *CacheContext) (io.Reader, error) {
raw, err := ioutil.ReadAll(src)
if err != nil {
return nil, err
}
width := c.Width
data := bytes.NewReader(raw)
img, format, err := image.Decode(data)
if err != nil {
return nil, err
}
var resizedImage image.NRGBA
if c.Crop {
minDimension := int(math.Min(float64(img.Bounds().Size().X), float64(img.Bounds().Size().Y)))
if minDimension < c.Width || c.Width == 0 {
width = minDimension
}
resizedImage = *imaging.Fill(img, width, width, imaging.Center, imaging.Lanczos)
} else {
resizedImage = *imaging.Resize(img, width, 0, imaging.Lanczos)
}
buf := new(bytes.Buffer)
var imgFormat imaging.Format
switch format {
case "png":
imgFormat = imaging.PNG
case "jpeg":
imgFormat = imaging.JPEG
case "tiff":
imgFormat = imaging.TIFF
case "bmp":
imgFormat = imaging.BMP
default:
return nil, errors.New("unsupported image format")
}
err = imaging.Encode(buf, resizedImage.SubImage(resizedImage.Rect), imgFormat)
if err != nil {
return nil, err
}
return buf, err
}
// Rams the head onto the base (hopefully body...) to return a Frankenstein.
func (skin *mcSkin) addHead(base, head *image.NRGBA) *image.NRGBA {
base.Pix = append(make([]uint8, HeadHeight*base.Stride), base.Pix...)
base.Rect.Max.Y += HeadHeight
fastDraw(base, head, LaWidth, 0)
return base
}
// Attached the legs onto the base (likely body).
func (skin *mcSkin) addLegs(base, legs *image.NRGBA) *image.NRGBA {
base.Pix = append(base.Pix, make([]uint8, LlHeight*base.Stride)...)
base.Rect.Max.Y += LlHeight
fastDraw(base, legs, LaWidth, HeadHeight+TorsoHeight)
return base
}
func texFromImage(rend *C.SDL_Renderer, img *image.NRGBA) *C.SDL_Texture {
b := img.Bounds()
w, h := b.Dx(), b.Dy()
fmt := C.SDL_PIXELFORMAT_ABGR8888
acc := C.SDL_TEXTUREACCESS_STATIC
tex := C.SDL_CreateTexture(rend, C.Uint32(fmt), C.int(acc), C.int(w), C.int(h))
if tex == nil {
panic(sdlError())
}
if C.SDL_UpdateTexture(tex, nil, unsafe.Pointer(&img.Pix[0]), C.int(img.Stride)) < 0 {
panic(sdlError())
}
if C.SDL_SetTextureBlendMode(tex, C.SDL_BLENDMODE_BLEND) < 0 {
panic(sdlError())
}
return tex
}
func convertNRGBA(dest *Image, src *image.NRGBA) {
var x, y, i, si int
var a uint16
for x = dest.Rect.Min.X; x < dest.Rect.Max.X; x++ {
for y = dest.Rect.Min.Y; y < dest.Rect.Max.Y; y++ {
si = src.PixOffset(x, y)
i = dest.PixOffset(x, y)
a = uint16(src.Pix[si+3])
dest.Pix[i+0] = uint8((uint16(src.Pix[si+2]) * a) / 0xff)
dest.Pix[i+1] = uint8((uint16(src.Pix[si+1]) * a) / 0xff)
dest.Pix[i+2] = uint8((uint16(src.Pix[si+0]) * a) / 0xff)
dest.Pix[i+3] = src.Pix[si+3]
}
}
}
// Takes an average of the biome colors of the surrounding area
func calculateBiome(bs *blocksSnapshot, x, z int, img *image.NRGBA) (byte, byte, byte) {
count := 0
var r, g, b int
for xx := -2; xx <= 2; xx++ {
for zz := -2; zz <= 2; zz++ {
biome := bs.biome(x+xx, z+zz)
ix := biome.ColorIndex & 0xFF
iy := biome.ColorIndex >> 8
col := img.NRGBAAt(ix, iy)
r += int(col.R)
g += int(col.G)
b += int(col.B)
count++
}
}
return byte(r / count), byte(g / count), byte(b / count)
}
func rotate(im image.Image, angle int) image.Image {
var rotated *image.NRGBA
// trigonometric (i.e counter clock-wise)
switch angle {
case 90:
newH, newW := im.Bounds().Dx(), im.Bounds().Dy()
rotated = image.NewNRGBA(image.Rect(0, 0, newW, newH))
for y := 0; y < newH; y++ {
for x := 0; x < newW; x++ {
rotated.Set(x, y, im.At(newH-1-y, x))
}
}
case -90:
newH, newW := im.Bounds().Dx(), im.Bounds().Dy()
rotated = image.NewNRGBA(image.Rect(0, 0, newW, newH))
for y := 0; y < newH; y++ {
for x := 0; x < newW; x++ {
rotated.Set(x, y, im.At(y, newW-1-x))
}
}
case 180, -180:
newW, newH := im.Bounds().Dx(), im.Bounds().Dy()
rotated = image.NewNRGBA(image.Rect(0, 0, newW, newH))
for y := 0; y < newH; y++ {
for x := 0; x < newW; x++ {
rotated.Set(x, y, im.At(newW-1-x, newH-1-y))
}
}
default:
return im
}
return rotated
}
func (s *Scene) Render(img *image.NRGBA) {
rect := img.Bounds()
w, h := float64(rect.Dx()), float64(rect.Dy())
i_max, j_max := rect.Dx(), rect.Dy()
for i := 0; i < i_max; i++ {
u := (float64(i) - w/2.0) / (w / 2.0)
for j := 0; j < j_max; j++ {
// (h / w) term is needed to correct for nonunity aspect ratios
v := (float64(j) - h/2.0) / (h / 2.0) * (h / w)
if *debug {
//fmt.Printf("%d/%d\n", i * j_max + j, i_max * j_max)
}
s.SetColor(i, j, u, v, img)
}
}
}