示例#1
0
文件: image.go 项目: hanslovsky/dvid
// 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
}
示例#2
0
文件: rt.go 项目: skyview059/vu
// 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)
	}
}
示例#3
0
文件: map2d.go 项目: quag/mcobj
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
}
示例#4
0
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
}
示例#5
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)
		}
	}
}
示例#6
0
文件: font.go 项目: nsf/gotris
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
}
示例#7
0
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
}
示例#8
0
文件: resize.go 项目: train860/picfit
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
}
示例#9
0
// 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
}
示例#10
0
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})
		}
	}
}
示例#11
0
文件: font.go 项目: sonald/gotris
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
}
示例#12
0
文件: glfps.go 项目: shogg/glfps
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
}
示例#13
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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)
	}
}
示例#14
0
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)
		}
	}
}
示例#15
0
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
}
示例#16
0
文件: image.go 项目: hanslovsky/dvid
// 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
}
示例#17
0
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)
}
示例#18
0
文件: ui.go 项目: vivounicorn/eaburns
// 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
}
示例#19
0
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
}
示例#20
0
文件: distfield.go 项目: sgraham/hack
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
}
示例#21
0
文件: lsb.go 项目: gianninou/lsbGo
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)
}
示例#22
0
文件: lsb.go 项目: gianninou/lsbGo
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
}
示例#23
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

}
示例#24
0
文件: process.go 项目: spideynn/imgd
// 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
}
示例#25
0
文件: process.go 项目: spideynn/imgd
// 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
}
示例#26
0
文件: canvas.go 项目: velour/ui
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
}
示例#27
0
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]
		}
	}
}
示例#28
0
// 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)
}
示例#29
0
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
}
示例#30
0
文件: render.go 项目: haldean/monte
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)
		}
	}
}