说明
golang newnrgba示例是从最受好评的开源项目中提取的实现代码，你可以参考下面示例的使用方式。
编程语言: Golang
命名空间/包名称: image
示例#1
文件：
file.go
项目：
elvizlai/MGBlog
//水印
func waterMark(picBytes []byte) []byte {
// 打开水印图并解码
img, fileType, _ := image.Decode(bytes.NewBuffer(picBytes))
//读取水印图片
watermark, _ := png.Decode(bytes.NewBuffer(wm))
//原始图界限
origin_size := img.Bounds()
//创建新图层
canvas := image.NewNRGBA(origin_size)
//贴原始图
draw.Draw(canvas, origin_size, img, image.ZP, draw.Src)
//贴水印图
draw.Draw(canvas, watermark.Bounds().Add(image.Pt(origin_size.Dx()-watermark.Bounds().Dx(), origin_size.Dy()-watermark.Bounds().Dy()-4)), watermark, image.ZP, draw.Over)
//生成新图片
buff := bytes.NewBuffer([]byte{})
switch fileType {
case "jpeg":
jpeg.Encode(buff, canvas, &jpeg.Options{95})
default:
png.Encode(buff, canvas)
}
return buff.Bytes()
}示例#2
文件：
process.go
项目：
spideynn/imgd
// Sets skin.Processed to an isometric render of the head from a top-left angle (showing 3 sides).
func (skin *mcSkin) GetCube(width int) error {
// Crop out the top of the head
topFlat := imaging.Crop(skin.Image, image.Rect(8, 0, 16, 8))
// Resize appropriately, so that it fills the `width` when rotated 45 def.
topFlat = imaging.Resize(topFlat, int(float64(width)*math.Sqrt(2)/3+1), 0, imaging.NearestNeighbor)
// Create the Gift filter
filter := gift.New(
gift.Rotate(45, color.Transparent, gift.LinearInterpolation),
)
bounds := filter.Bounds(topFlat.Bounds())
top := image.NewNRGBA(bounds)
// Draw it on the filter, then smush it!
filter.Draw(top, topFlat)
top = imaging.Resize(top, width+2, width/3, imaging.NearestNeighbor)
// Skew the front and sides at 15 degree angles to match up with the
// head that has been smushed
front := skin.cropHead(skin.Image).(*image.NRGBA)
side := imaging.Crop(skin.Image, image.Rect(0, 8, 8, 16))
front = imaging.Resize(front, width/2, int(float64(width)/1.75), imaging.NearestNeighbor)
side = imaging.Resize(side, width/2, int(float64(width)/1.75), imaging.NearestNeighbor)
front = skewVertical(front, math.Pi/12)
side = skewVertical(imaging.FlipH(side), math.Pi/-12)
// Create a new image to assemble upon
skin.Processed = image.NewNRGBA(image.Rect(0, 0, width, width))
// Draw each side
draw.Draw(skin.Processed.(draw.Image), image.Rect(0, width/6, width/2, width), side, image.Pt(0, 0), draw.Src)
draw.Draw(skin.Processed.(draw.Image), image.Rect(width/2, width/6, width, width), front, image.Pt(0, 0), draw.Src)
// Draw the top we created
draw.Draw(skin.Processed.(draw.Image), image.Rect(-1, 0, width+1, width/3), top, image.Pt(0, 0), draw.Over)
return nil
}示例#3
文件：
orientation.go
项目：
netroby/seaweedfs
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#4
文件：
signer.go
项目：
ailncode/ufop
func (this *Signer) GetMoreLineImage(text string, text_color image.Image, l int, fix_top, fix_bottom int) (image.Image, error) {
r := image.Rect(0, 0, 414, 96)
img := image.NewNRGBA(r)
c := freetype.NewContext()
c.SetDPI(this.Dpi)
c.SetFont(this.font)
c.SetFontSize(this.FontSize)
c.SetClip(img.Bounds())
c.SetDst(img)
c.SetSrc(text_color)
//pt := freetype.Pt(0, 0)
pt := freetype.Pt(0, 0+int(c.PointToFix32(this.FontSize)>>8))
var err error
limit := c.PixToFix32(l)
str := strings.Split(text, "\r\n")
for i, s := range str {
pt, err = c.DrawString(s, pt, limit)
if err != nil {
fmt.Println("c.DrawString(%s) error(%v)", s, err)
return nil, err
}
if i < len(str)-1 {
pt.Y += c.PointToFix32(this.FontSize * 1.5)
}
}
x, y := l, c.Fix32ToPix(pt.Y)
sub_r := image.Rect(0, 0, x+20, y+(fix_bottom-fix_top))
sub_img := image.NewNRGBA(sub_r)
draw.Draw(sub_img, sub_r, img, image.Point{0, fix_top}, draw.Src)
return sub_img, nil
}示例#5
文件：
slide.go
项目：
ayatk/MinecraftRecipeMaker
// imgの片方の辺をずらして変形する
// (option=trueで縦/falseで横に伸ばす/option2=trueで左上固定/falseで右下固定)
// ＿ ＿
// | | → / /
// ￣ ￣
//
func Slide(img *image.Image, length int, option bool, option2 bool) image.Image {
size := (*img).Bounds().Size()
//横を伸ばす場合は横の長さがx+x/lenになる
img2 := image.NewNRGBA(image.Rect(0, 0, size.X+int(float64(size.X)/float64(length)), size.Y))
if option {
//縦を伸ばす場合は縦の長さがx+x/lenになる
img2 = image.NewNRGBA(image.Rect(0, 0, size.X, size.Y+int(float64(size.Y)/float64(length))))
}
size2 := (*img2).Bounds().Size()
//統一で扱うために長い方を取得
sizeB := size2.Y
if size2.X > size2.Y {
sizeB = size2.X
}
offset := 0
for x, x2 := 0, 0; x < sizeB; x++ {
//逆スタートの場合は反転
x2 = x
if option2 {
if option {
x2 = size2.X - x
} else {
x2 = size2.Y - x
}
}
for y, y2 := 0, 0; y < sizeB; y++ {
//逆スタートの場合は反転
y2 = y
if option2 {
if option {
y2 = size2.Y - y
} else {
y2 = size2.X - y
}
}
c := (*img).At(x2, y2)
r, g, b, _ := c.RGBA()
if !(r == 0 && g == 0 && b == 0) {
//縦横の入れ替えの場合
if option {
img2.Set(x2, y2+offset, c)
} else {
img2.Set(y2+offset, x2, c)
}
}
}
//ずらす分
if x2%length == 0 {
offset++
}
}
return img2
}示例#6
文件：
perceptual_test.go
项目：
crhym3/imgdiff
func BenchmarkPCompare(b *testing.B) {
m1 := image.NewNRGBA(image.Rect(0, 0, 100, 100))
m2 := image.NewNRGBA(image.Rect(0, 0, 100, 100))
d := NewDefaultPerceptual()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
d.Compare(m1, m2)
}
})
}示例#7
文件：
helpers_test.go
项目：
mf1389004071/platform
func TestEncodeDecode(t *testing.T) {
imgWithAlpha := image.NewNRGBA(image.Rect(0, 0, 3, 3))
imgWithAlpha.Pix = []uint8{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138,
244, 245, 246, 247, 248, 249, 250, 252, 252, 253, 254, 255,
}
imgWithoutAlpha := image.NewNRGBA(image.Rect(0, 0, 3, 3))
imgWithoutAlpha.Pix = []uint8{
0, 1, 2, 255, 4, 5, 6, 255, 8, 9, 10, 255,
127, 128, 129, 255, 131, 132, 133, 255, 135, 136, 137, 255,
244, 245, 246, 255, 248, 249, 250, 255, 252, 253, 254, 255,
}
for _, format := range []Format{JPEG, PNG, GIF, BMP, TIFF} {
img := imgWithoutAlpha
if format == PNG {
img = imgWithAlpha
}
buf := &bytes.Buffer{}
err := Encode(buf, img, format)
if err != nil {
t.Errorf("fail encoding format %s", format)
continue
}
img2, err := Decode(buf)
if err != nil {
t.Errorf("fail decoding format %s", format)
continue
}
img2cloned := Clone(img2)
delta := 0
if format == JPEG {
delta = 3
} else if format == GIF {
delta = 16
}
if !compareNRGBA(img, img2cloned, delta) {
t.Errorf("test [DecodeEncode %s] failed: %#v %#v", format, img, img2cloned)
continue
}
}
buf := &bytes.Buffer{}
err := Encode(buf, imgWithAlpha, Format(100))
if err != ErrUnsupportedFormat {
t.Errorf("expected ErrUnsupportedFormat")
}
}示例#8
文件：
resize_test.go
项目：
donlzx/rez
func TestNrgbaPlanes(t *testing.T) {
w, h := 256, 256
src := readImage(t, "testdata/nrgba.png")
ref := image.NewNRGBA(src.Bounds())
err := Convert(ref, src, nil)
expect(t, err, nil)
raw := image.NewNRGBA(image.Rect(0, 0, w*2, h*2))
dst := raw.SubImage(image.Rect(7, 7, 7+w, 7+h))
err = Convert(dst, src, NewBicubicFilter())
expect(t, err, nil)
err = Convert(src, dst, NewBicubicFilter())
expect(t, err, nil)
checkPsnrs(t, ref, src, image.Rectangle{}, []float64{39})
}示例#9
文件：
functions.go
项目：
alexchipliev/go-start
func NewImageOfTypeRect(src image.Image, bounds image.Rectangle) image.Image {
switch i := src.(type) {
case *image.Alpha:
return image.NewAlpha(bounds)
case *image.Alpha16:
return image.NewAlpha16(bounds)
case *image.Gray:
return image.NewGray(bounds)
case *image.Gray16:
return image.NewGray16(bounds)
case *image.NRGBA:
return image.NewNRGBA(bounds)
case *image.NRGBA64:
return image.NewNRGBA64(bounds)
case *image.Paletted:
return image.NewPaletted(bounds, i.Palette)
case *image.RGBA:
return image.NewRGBA(bounds)
case *image.RGBA64:
return image.NewRGBA64(bounds)
case *image.YCbCr:
return image.NewYCbCr(bounds, i.SubsampleRatio)
}
panic("Unknown image type")
}示例#10
文件：
imageproxy_test.go
项目：
LimiQS/imageproxy
func (t testTransport) RoundTrip(req *http.Request) (*http.Response, error) {
var raw string
switch req.URL.Path {
case "/ok":
raw = "HTTP/1.1 200 OK\n\n"
case "/error":
return nil, errors.New("http protocol error")
case "/nocontent":
raw = "HTTP/1.1 204 No Content\n\n"
case "/etag":
raw = "HTTP/1.1 200 OK\nEtag: \"tag\"\n\n"
case "/png":
m := image.NewNRGBA(image.Rect(0, 0, 1, 1))
img := new(bytes.Buffer)
png.Encode(img, m)
raw = fmt.Sprintf("HTTP/1.1 200 OK\nContent-Length: %d\n\n%s", len(img.Bytes()), img.Bytes())
default:
raw = "HTTP/1.1 404 Not Found\n\n"
}
buf := bufio.NewReader(bytes.NewBufferString(raw))
return http.ReadResponse(buf, req)
}示例#11
文件：
swatches.go
项目：
jqln-0/colorshow
func createSwatch(col color.Color, size int) image.Image {
log.Printf("Creating swatch for %v\n", col)
bounds := image.Rect(0, 0, size, size)
img := image.NewNRGBA(bounds)
draw.Draw(img, img.Bounds(), image.NewUniform(col), img.Bounds().Min, draw.Src)
return img
}示例#12
文件：
main.go
项目：
jf/gwp
// cut out the image and return individual channels with image.Image
// no encoding of JPEG
func cut(original image.Image, db *map[string][3]float64, tileSize, x1, y1, x2, y2 int) <-chan image.Image {
c := make(chan image.Image)
sp := image.Point{0, 0}
go func() {
newimage := image.NewNRGBA(image.Rect(x1, y1, x2, y2))
for y := y1; y < y2; y = y + tileSize {
for x := x1; x < x2; x = x + tileSize {
r, g, b, _ := original.At(x, y).RGBA()
color := [3]float64{float64(r), float64(g), float64(b)}
nearest := nearest(color, db)
file, err := os.Open(nearest)
if err == nil {
img, _, err := image.Decode(file)
if err == nil {
t := resize(img, tileSize)
tile := t.SubImage(t.Bounds())
tileBounds := image.Rect(x, y, x+tileSize, y+tileSize)
draw.Draw(newimage, tileBounds, tile, sp, draw.Src)
} else {
fmt.Println("error in decoding nearest", err, nearest)
}
} else {
fmt.Println("error opening file when creating mosaic:", nearest)
}
file.Close()
}
}
c <- newimage.SubImage(newimage.Rect)
}()
return c
}示例#13
文件：
image.go
项目：
gilmae/mandelbrot
func draw_image(filename string, plot_map map[Key]Point, width int, height int, gradient string) {
build_gradient(gradient)
fill_palette()
bounds := image.Rect(0, 0, width, height)
b := image.NewNRGBA(bounds)
draw.Draw(b, bounds, image.NewUniform(color.Black), image.ZP, draw.Src)
for x := 0; x < width; x += 1 {
for y := 0; y < height; y += 1 {
var p = plot_map[Key{x, y}]
b.Set(p.X, p.Y, get_colour(p.Escape))
}
}
file, err := os.Create(filename)
if err != nil {
fmt.Println(err)
}
if err = jpeg.Encode(file, b, &jpeg.Options{jpeg.DefaultQuality}); err != nil {
fmt.Println(err)
}
if err = file.Close(); err != nil {
fmt.Println(err)
}
}示例#14
文件：
adjust.go
项目：
ChrisOHu/platform
// AdjustFunc applies the fn function to each pixel of the img image and returns the adjusted image.
//
// Example:
//
// dstImage = imaging.AdjustFunc(
// srcImage,
// func(c color.NRGBA) color.NRGBA {
// // shift the red channel by 16
// r := int(c.R) + 16
// if r > 255 {
// r = 255
// }
// return color.NRGBA{uint8(r), c.G, c.B, c.A}
// }
// )
//
func AdjustFunc(img image.Image, fn func(c color.NRGBA) color.NRGBA) *image.NRGBA {
src := toNRGBA(img)
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++ {
for x := 0; x < width; x++ {
i := y*src.Stride + x*4
j := y*dst.Stride + x*4
r := src.Pix[i+0]
g := src.Pix[i+1]
b := src.Pix[i+2]
a := src.Pix[i+3]
c := fn(color.NRGBA{r, g, b, a})
dst.Pix[j+0] = c.R
dst.Pix[j+1] = c.G
dst.Pix[j+2] = c.B
dst.Pix[j+3] = c.A
}
}
})
return dst
}示例#15
文件：
imageRenderer.go
项目：
gmacd/rt
func (ir *ImageRenderer) RenderToFile(filename string) {
img := image.NewNRGBA(image.Rect(0, 0, ir.Width, ir.Height))
for y := 0; y < ir.Height; y++ {
for x := 0; x < ir.Width; x++ {
i := y*ir.Width*4 + x*4
r := uint8(ir.Pixels[i] * 255.0)
g := uint8(ir.Pixels[i+1] * 255.0)
b := uint8(ir.Pixels[i+2] * 255.0)
a := uint8(ir.Pixels[i+3] * 255.0)
c := color.NRGBA{r, g, b, a}
img.Set(x, y, c)
}
}
imgWriter, _ := os.Create(filename)
defer imgWriter.Close()
var err error
switch filepath.Ext(filename) {
case ".png":
err = png.Encode(imgWriter, img)
case ".jpg", ".jpeg":
err = jpeg.Encode(imgWriter, img, &jpeg.Options{Quality: jpeg.DefaultQuality})
}
if err != nil {
fmt.Printf("Error writing out %v: %v", filename, err)
}
}示例#16
文件：
font.go
项目：
Kunde21/engi
func (f *Font) Render(text string) *Texture {
width, height, yBearing := f.TextDimensions(text)
font := f.ttf
size := f.Size
// Colors
fg := image.NewUniform(color.NRGBA{f.FG.R, f.FG.G, f.FG.B, f.FG.A})
bg := image.NewUniform(color.NRGBA{f.BG.R, f.BG.G, f.BG.B, f.BG.A})
// Create the font context
c := freetype.NewContext()
nrgba := image.NewNRGBA(image.Rect(0, 0, width, height))
draw.Draw(nrgba, nrgba.Bounds(), bg, image.ZP, draw.Src)
c.SetDPI(dpi)
c.SetFont(font)
c.SetFontSize(size)
c.SetClip(nrgba.Bounds())
c.SetDst(nrgba)
c.SetSrc(fg)
// Draw the text.
pt := freetype.Pt(0, int(yBearing))
_, err := c.DrawString(text, pt)
if err != nil {
log.Println(err)
return nil
}
// Create texture
imObj := &ImageObject{nrgba}
return NewTexture(imObj)
}示例#17
文件：
imageio.go
项目：
rweyrauch/gopbrt
func writeImagePng(filename string, pixels []float32, xres, yres int) {
outImage := image.NewNRGBA(image.Rect(0, 0, xres, yres))
to_byte := func(v float32) uint8 {
// apply gamma and convert to 0..255
return uint8(Clamp(255.0*math.Pow(float64(v), 1.0/2.2), 0.0, 255.0))
}
for y := 0; y < yres; y++ {
for x := 0; x < xres; x++ {
var fcolor color.NRGBA
fcolor.R = to_byte(pixels[3*(y*xres+x)+0])
fcolor.G = to_byte(pixels[3*(y*xres+x)+1])
fcolor.B = to_byte(pixels[3*(y*xres+x)+2])
fcolor.A = 0xff
outImage.Set(x, y, fcolor)
}
}
f, err := os.Create(filename)
defer f.Close()
if err != nil {
Error("Error writing PNG \"%s\"", filename)
} else {
png.Encode(f, outImage)
}
}示例#18
文件：
resample.go
项目：
hamstah/imaging
// 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#19
文件：
convolution.go
项目：
tcsc/squaddie
func convolve(img *plugin.MMapImage, matrix Matrix) {
bounds := img.Bounds()
height := bounds.Dy()
width := bounds.Dx()
out := image.NewNRGBA(img.Bounds())
log.Info("Convolving with %d x %d image", width, height)
mwOn2 := matrix.width / 2
mhOn2 := matrix.height / 2
for py := 0; py < height; py++ {
for px := 0; px < width; px++ {
var r, g, b int
for y := 0; y < matrix.height; y++ {
dy := y - mhOn2
for x := 0; x < matrix.width; x++ {
dx := x - mwOn2
coef := matrix.At(x, y)
p := img.NRGBAAt(px+dx, py+dy)
r += (coef * int(p.R))
g += (coef * int(p.G))
b += (coef * int(p.B))
}
}
out.SetNRGBA(px, py, nrgba(r, g, b, 255))
}
}
// memcpy the result back over the input buffer
copy(img.Pix(), out.Pix)
}示例#20
文件：
qrcoded.go
项目：
Catorpilor/go_tdd
func GenerateQRCode(w io.Writer, code string, version Version) error {
size := version.MappedSize()
img := image.NewNRGBA(image.Rect(0, 0, size, size))
//buf := new(bytes.Buffer)
return png.Encode(w, img)
//return buf.Bytes()
}示例#21
文件：
effects.go
项目：
ChrisOHu/platform
// Sharpen produces a sharpened version of the image.
// Sigma parameter must be positive and indicates how much the image will be sharpened.
//
// Usage example:
//
// dstImage := imaging.Sharpen(srcImage, 3.5)
//
func Sharpen(img image.Image, sigma float64) *image.NRGBA {
if sigma <= 0 {
// sigma parameter must be positive!
return Clone(img)
}
src := toNRGBA(img)
blurred := Blur(img, sigma)
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++ {
for x := 0; x < width; x++ {
i := y*src.Stride + x*4
for j := 0; j < 4; j++ {
k := i + j
val := int(src.Pix[k]) + (int(src.Pix[k]) - int(blurred.Pix[k]))
if val < 0 {
val = 0
} else if val > 255 {
val = 255
}
dst.Pix[k] = uint8(val)
}
}
}
})
return dst
}示例#22
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#23
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#24
文件：
helpers.go
项目：
maleck13/locals-api
// New creates a new image with the specified width and height, and fills it with the specified color.
func New(width, height int, fillColor color.Color) *image.NRGBA {
if width <= 0 || height <= 0 {
return &image.NRGBA{}
}
dst := image.NewNRGBA(image.Rect(0, 0, width, height))
c := color.NRGBAModel.Convert(fillColor).(color.NRGBA)
if c.R == 0 && c.G == 0 && c.B == 0 && c.A == 0 {
return dst
}
cs := []uint8{c.R, c.G, c.B, c.A}
// fill the first row
for x := 0; x < width; x++ {
copy(dst.Pix[x*4:(x+1)*4], cs)
}
// copy the first row to other rows
for y := 1; y < height; y++ {
copy(dst.Pix[y*dst.Stride:y*dst.Stride+width*4], dst.Pix[0:width*4])
}
return dst
}示例#25
文件：
cacphtcode.go
项目：
yunkaiyueming/go_code
func NewImage(digits []byte, width, height int) *Image {
img := new(Image)
r := image.Rect(img.width, img.height, stdWidth, stdHeight)
img.NRGBA = image.NewNRGBA(r)
img.color = &color.NRGBA{
uint8(rand.Intn(129)),
uint8(rand.Intn(129)),
uint8(rand.Intn(129)),
0xFF,
}
// Draw background (10 random circles of random brightness)
img.calculateSizes(width, height, len(digits))
img.fillWithCircles(10, img.dotsize)
maxx := width - (img.width+img.dotsize)*len(digits) - img.dotsize
maxy := height - img.height - img.dotsize*2
x := rnd(img.dotsize*2, maxx)
y := rnd(img.dotsize*2, maxy)
// Draw digits.
for _, n := range digits {
img.drawDigit(font[n], x, y)
x += img.width + img.dotsize
}
// Draw strike-through line.
img.strikeThrough()
return img
}示例#26
文件：
engi_glfw.go
项目：
EtienneBruines/engi
func LoadImage(data interface{}) Image {
var m image.Image
switch data := data.(type) {
default:
log.Fatal("NewTexture needs a string or io.Reader")
case string:
file, err := os.Open(data)
if err != nil {
log.Fatal(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
log.Fatal(err)
}
m = img
case io.Reader:
img, _, err := image.Decode(data)
if err != nil {
log.Fatal(err)
}
m = img
case image.Image:
m = data
}
b := m.Bounds()
newm := image.NewNRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(newm, newm.Bounds(), m, b.Min, draw.Src)
return &ImageObject{newm}
}示例#27
文件：
image_test.go
项目：
hajimehoshi/ebiten
func BenchmarkCopyImageNRGBA(b *testing.B) {
img := image.NewNRGBA(image.Rect(0, 0, 4096, 4096))
b.ResetTimer()
for i := 0; i < b.N; i++ {
CopyImage(img)
}
}示例#28
文件：
himawari.go
项目：
avinashbot/satellite
// Join the matrix of images into a single image.
func (h Himawari) joinGrid(grid [][]image.Image) image.Image {
dst := image.NewNRGBA(image.Rect(0, 0, gridSize*h.Depth, gridSize*h.Depth))
var wg sync.WaitGroup
for i := range grid {
for j := range grid[i] {
if grid[i][j] == nil {
break
}
wg.Add(1)
go func(i, j int) {
defer wg.Done()
// Modification is performed pixel-by-pixel, so async
// should be fine, theoretically.
src := grid[i][j]
sdx, sdy := src.Bounds().Dx(), src.Bounds().Dy()
rect := image.Rect(
i*sdx, j*sdy, i*sdx+sdx, j*sdy+sdy,
)
draw.Draw(dst, rect, src, image.ZP, draw.Src)
}(i, j)
}
}
wg.Wait()
return dst
}示例#29
文件：
escroller.go
项目：
EtienneBruines/engi
// generateBackground creates a background of green tiles - might not be the most efficient way to do this
func generateBackground() *ecs.Entity {
rect := image.Rect(0, 0, int(worldWidth), int(worldHeight))
img := image.NewNRGBA(rect)
c1 := color.RGBA{102, 153, 0, 255}
c2 := color.RGBA{102, 173, 0, 255}
for i := rect.Min.X; i < rect.Max.X; i++ {
for j := rect.Min.Y; j < rect.Max.Y; j++ {
if i%40 > 20 {
if j%40 > 20 {
img.Set(i, j, c1)
} else {
img.Set(i, j, c2)
}
} else {
if j%40 > 20 {
img.Set(i, j, c2)
} else {
img.Set(i, j, c1)
}
}
}
}
bgTexture := engi.NewImageObject(img)
field := ecs.NewEntity([]string{"RenderSystem"})
fieldRender := engi.NewRenderComponent(engi.NewTexture(bgTexture), engi.Point{1, 1}, "Background1")
fieldRender.SetPriority(engi.Background)
fieldSpace := &engi.SpaceComponent{engi.Point{0, 0}, worldWidth, worldHeight}
field.AddComponent(fieldRender)
field.AddComponent(fieldSpace)
return field
}示例#30
文件：
debugger.go
项目：
abarax/gomeboycolor
//IMAGE DUMP FUNCTIONS - SLOPPY CODE!!!!
func SpritesToImage(sprites [40][8][8]types.RGB, w, h int) (*image.NRGBA, error) {
out := image.NewNRGBA(image.Rect(0, 0, w, h))
font, err := GetFont("../resources/FreeUniversal-Regular.ttf")
if err != nil {
return out, err
}
draw.Draw(out, out.Bounds(), &image.Uniform{color.RGBA{200, 200, 200, 255}}, image.ZP, draw.Src)
DrawTextOnImage("Sprites", font, out, 8, (out.Bounds().Dx()/2)-10, 2)
plotX, plotY, imgX, imgY := 4, 26, 0, 0
var spacing int = 8
for i, spr := range sprites {
for y := 0; y < 8; y++ {
for x := 0; x < 8; x++ {
cr := color.RGBA{spr[y][x].Red, spr[y][x].Green, spr[y][x].Blue, 0xFF}
out.Set(imgX+plotX, imgY+plotY, cr)
imgX++
}
imgX = 0
imgY++
}
imgY = 0
DrawTextOnImage(fmt.Sprint(i), font, out, 4, plotX, plotY+12)
plotX += 8 + spacing
if plotX >= 490 {
plotY += 24 + spacing
plotX = 4
}
}
return out, nil
}