// Draw renders the given cpu cores on img.
func (app *App) Draw(img draw.Image, cpus []CPU) {
rect := img.Bounds()
bg := app.Background
if bg == nil {
bg = image.Black
}
draw.Draw(img, rect, bg, bg.Bounds().Min, draw.Over)
if len(cpus) == 0 {
return
}
cpuDx := rect.Dx() / len(cpus)
ptIncr := image.Point{X: cpuDx}
ptDelta := image.Point{}
rectDx := image.Rectangle{
Min: rect.Min,
Max: rect.Max,
}
rectDx.Max.X = rect.Min.X + cpuDx
for _, cpu := range cpus {
irect := image.Rectangle{
Min: rectDx.Min.Add(ptDelta),
Max: rectDx.Max.Add(ptDelta),
}
subimg := SubImage(img, irect)
app.renderCPU(subimg, cpu)
ptDelta = ptDelta.Add(ptIncr)
}
}
// 翻转函数，要求两个图像大小契合，act&1 == 0则左右翻转，否则垂直翻转。
func Overturn(dst draw.Image, src image.Image, act int) error {
var to func(int, int) (int, int)
sr := src.Bounds()
dr := dst.Bounds()
W := dr.Max.X - dr.Min.X
H := dr.Max.Y - dr.Min.Y
if H <= 0 || W <= 0 {
return errors.New("target image is empty or noncanonical")
}
if sr.Min.X >= sr.Max.X || sr.Min.Y >= sr.Max.Y {
return errors.New("source image is empty or noncanonical")
}
if sr.Max.X-sr.Min.X != W || sr.Max.Y-sr.Min.Y != H {
return errors.New("target and source must be same size!")
}
if act&1 == 0 {
to = func(x, y int) (int, int) {
return W - 1 - x, y
}
} else {
to = func(x, y int) (int, int) {
return x, H - 1 - y
}
}
for i := 0; i < W; i++ {
for j := 0; j < H; j++ {
x, y := to(i, j)
dst.Set(dr.Min.X+x, dr.Min.Y+y, src.At(sr.Min.X+i, sr.Min.Y+j))
}
}
return nil
}
func (ff *FontFace) GetImage(text string) (img draw.Image, err error) {
var (
src image.Image
bg image.Image
dst draw.Image
pt fixed.Point26_6
w int
h int
)
src = image.NewUniform(ff.fg)
bg = image.NewUniform(ff.bg)
w = int(float32(len(text)) * ff.charw)
h = int(ff.charh)
dst = image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(dst, dst.Bounds(), bg, image.ZP, draw.Src)
ff.context.SetSrc(src)
ff.context.SetDst(dst)
ff.context.SetClip(dst.Bounds())
pt = freetype.Pt(0, int(ff.charh+ff.offy))
if pt, err = ff.context.DrawString(text, pt); err != nil {
return
}
img = image.NewRGBA(image.Rect(0, 0, int(pt.X/64), int(pt.Y/64)))
draw.Draw(img, img.Bounds(), dst, image.Pt(0, -int(ff.offy)), draw.Src)
return
}
func (p *Drawer) PasteAt(img draw.Image, pt P) {
flr := pt.Floor()
bounds := img.Bounds()
dp := image.Point{flr[0], flr[1]}
rec := bounds.Sub(bounds.Min).Add(dp)
draw.Draw(p.Img, rec, img, bounds.Min, draw.Over)
}
// Transform applies the affine transform to src and produces dst.
func (a Affine) Transform(dst draw.Image, src image.Image, i interp.Interp) error {
if dst == nil {
return errors.New("graphics: dst is nil")
}
if src == nil {
return errors.New("graphics: src is nil")
}
// RGBA fast path.
dstRGBA, dstOk := dst.(*image.RGBA)
srcRGBA, srcOk := src.(*image.RGBA)
interpRGBA, interpOk := i.(interp.RGBA)
if dstOk && srcOk && interpOk {
return a.transformRGBA(dstRGBA, srcRGBA, interpRGBA)
}
srcb := src.Bounds()
b := dst.Bounds()
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
sx, sy := a.pt(x, y)
if inBounds(srcb, sx, sy) {
dst.Set(x, y, i.Interp(src, sx, sy))
}
}
}
return nil
}
func warm(out, in draw.Image, opacity uint8, colors []color.Color) {
draw.Draw(out, out.Bounds(), image.Transparent, image.ZP, draw.Src)
bounds := in.Bounds()
collen := float64(len(colors))
wg := &sync.WaitGroup{}
for x := bounds.Min.X; x < bounds.Max.X; x++ {
wg.Add(1)
go func(x int) {
defer wg.Done()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
col := in.At(x, y)
_, _, _, alpha := col.RGBA()
if alpha > 0 {
percent := float64(alpha) / float64(0xffff)
template := colors[int((collen-1)*(1.0-percent))]
tr, tg, tb, ta := template.RGBA()
ta /= 256
outalpha := uint8(float64(ta) *
(float64(opacity) / 256.0))
outcol := color.NRGBA{
uint8(tr / 256),
uint8(tg / 256),
uint8(tb / 256),
uint8(outalpha)}
out.Set(x, y, outcol)
}
}
}(x)
}
wg.Wait()
}
// Thumbnail scales and crops src so it fits in dst.
func Thumbnail(dst draw.Image, src image.Image) error {
// Scale down src in the dimension that is closer to dst.
sb := src.Bounds()
db := dst.Bounds()
rx := float64(sb.Dx()) / float64(db.Dx())
ry := float64(sb.Dy()) / float64(db.Dy())
var b image.Rectangle
if rx < ry {
b = image.Rect(0, 0, db.Dx(), int(float64(sb.Dy())/rx))
} else {
b = image.Rect(0, 0, int(float64(sb.Dx())/ry), db.Dy())
}
buf := image.NewRGBA(b)
if err := Scale(buf, src); err != nil {
return err
}
// Crop.
// TODO(crawshaw): improve on center-alignment.
var pt image.Point
if rx < ry {
pt.Y = (b.Dy() - db.Dy()) / 2
} else {
pt.X = (b.Dx() - db.Dx()) / 2
}
draw.Draw(dst, db, buf, pt, draw.Src)
return nil
}
// NewImage returns a new image canvas
// that draws to the given image. The
// minimum point of the given image
// should probably be 0,0.
func NewImage(img draw.Image, name string) (*Canvas, error) {
w := float64(img.Bounds().Max.X - img.Bounds().Min.X)
h := float64(img.Bounds().Max.Y - img.Bounds().Min.Y)
X, err := xgbutil.NewConn()
if err != nil {
return nil, err
}
keybind.Initialize(X)
ximg := xgraphics.New(X, image.Rect(0, 0, int(w), int(h)))
err = ximg.CreatePixmap()
if err != nil {
return nil, err
}
painter := NewPainter(ximg)
gc := draw2d.NewGraphicContextWithPainter(ximg, painter)
gc.SetDPI(dpi)
gc.Scale(1, -1)
gc.Translate(0, -h)
wid := ximg.XShowExtra(name, true)
go func() {
xevent.Main(X)
}()
c := &Canvas{
Canvas: vgimg.NewWith(vgimg.UseImageWithContext(img, gc)),
x: X,
ximg: ximg,
wid: wid,
}
vg.Initialize(c)
return c, nil
}
// Convolve produces dst by applying the convolution kernel k to src.
func Convolve(dst draw.Image, src image.Image, k Kernel) (err error) {
if dst == nil || src == nil || k == nil {
return nil
}
b := dst.Bounds()
dstRgba, ok := dst.(*image.RGBA)
if !ok {
dstRgba = image.NewRGBA(b)
}
switch k := k.(type) {
case *SeparableKernel:
err = convolveRGBASep(dstRgba, src, k)
default:
err = convolveRGBA(dstRgba, src, k)
}
if err != nil {
return err
}
if !ok {
draw.Draw(dst, b, dstRgba, b.Min, draw.Src)
}
return nil
}
func warm(out, in draw.Image, opacity uint8, colors []color.Color) {
bounds := in.Bounds()
collen := float64(len(colors))
wg := sync.WaitGroup{}
wg.Add(bounds.Dx())
for x := bounds.Min.X; x < bounds.Max.X; x++ {
go func(x int) {
defer wg.Done()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
col := in.At(x, y)
_, _, _, alpha := col.RGBA()
percent := float64(alpha) / float64(0xffff)
var outcol color.Color
if percent == 0 {
outcol = color.Transparent
} else {
template := colors[int((collen-1)*(1.0-percent))]
tr, tg, tb, ta := template.RGBA()
ta /= 256
outalpha := uint8(float64(ta) *
(float64(opacity) / 256.0))
outcol = color.NRGBA{
uint8(tr / 256),
uint8(tg / 256),
uint8(tb / 256),
uint8(outalpha)}
}
out.Set(x, y, outcol)
}
}(x)
}
wg.Wait()
}
// NewFromImage uses the given image as the destination for all calls to Add.
// It is assumed to be empty at the beginning so all the available space will be
// used for sub-images.
func NewFromImage(atlas draw.Image) *Atlas {
packer := binpacker.New(atlas.Bounds().Dx(), atlas.Bounds().Dy())
return &Atlas{
Image: atlas,
packer: packer,
}
}
// RenderCPU implements the Renderer interface.
func (b *Border) RenderCPU(img draw.Image, cpu CPU) {
rect := img.Bounds()
interior := geometry.Contract(rect, b.Size)
mask := MaskInside(interior)
draw.DrawMask(img, rect, image.NewUniform(b.Color), image.ZP, mask, rect.Min, draw.Over)
sub := SubImage(img, interior)
b.Renderer.RenderCPU(sub, cpu)
}
func newImageDimentions(img draw.Image, angle float64) (int, int) {
bounds := img.Bounds()
width := float64(bounds.Max.X - bounds.Min.X)
height := float64(bounds.Max.Y - bounds.Min.Y)
w, h := newDimentions(width, height, angle)
return int(w), int(h)
}
func testDrawRandom(p draw.Image) {
bd := p.Bounds()
for y, yEnd := bd.Min.Y, bd.Max.Y; y < yEnd; y++ {
for x, xEnd := bd.Min.X, bd.Max.X; x < xEnd; x++ {
p.Set(x, y, testRandomColor())
}
}
}
// Apply the given color mapping to the specified image buffers.
func Apply(from, to *Rule, src, dst draw.Image) {
var x, y int
var r, g, b, a uint32
var sc color.Color
var dc color.RGBA
var pix pixel
rect := src.Bounds()
for y = 0; y < rect.Dy(); y++ {
for x = 0; x < rect.Dx(); x++ {
sc = src.At(x, y)
r, g, b, a = sc.RGBA()
pix.r = uint8(r >> 8)
pix.g = uint8(g >> 8)
pix.b = uint8(b >> 8)
pix.a = uint8(a >> 8)
// Check if the pixel matches the filter rule.
if !(match(pix.r, from.R) && match(pix.g, from.G) && match(pix.b, from.B) && match(pix.a, from.A)) {
dst.Set(x, y, sc)
continue
}
// Compute three different types of grayscale conversion.
// These can be applied by named references.
pix.average = uint8(((r + g + b) / 3) >> 8)
pix.lightness = uint8(((min(min(r, g), b) + max(max(r, g), b)) / 2) >> 8)
// For luminosity it is necessary to apply an inverse of the gamma
// function for the color space before calculating the inner product.
// Then you apply the gamma function to the reduced value. Failure to
// incorporate the gamma function can result in errors of up to 20%.
//
// For typical computer stuff, the color space is sRGB. The right
// numbers for sRGB are approx. 0.21, 0.72, 0.07. Gamma for sRGB
// is a composite function that approximates exponentiation by 1/2.2
//
// This is a rather expensive operation, but gives a much more accurate
// and satisfactory result than the average and lightness versions.
pix.luminosity = gammaSRGB(
0.212655*invGammaSRGB(pix.r) +
0.715158*invGammaSRGB(pix.g) +
0.072187*invGammaSRGB(pix.b))
// Transform color.
dc.R = transform(&pix, pix.r, to.R)
dc.G = transform(&pix, pix.g, to.G)
dc.B = transform(&pix, pix.b, to.B)
dc.A = transform(&pix, pix.a, to.A)
// Set new pixel.
dst.Set(x, y, dc)
}
}
}
// Blends src image (top layer) into dst image (bottom layer) using
// the BlendFunc provided by mode. BlendFunc is applied to each pixel
// where the src image overlaps the dst image and the result is stored
// in the original dst image, src image is unmutable.
func BlendImage(dst draw.Image, src image.Image, mode BlendFunc) {
// Obtain the intersection of both images.
inter := dst.Bounds().Intersect(src.Bounds())
// Apply BlendFuc to each pixel in the intersection.
for y := inter.Min.Y; y < inter.Max.Y; y++ {
for x := inter.Min.X; x < inter.Max.X; x++ {
dst.Set(x, y, mode(dst.At(x, y), src.At(x, y)))
}
}
}
// Like PixelSizeChanger, but instead of the pixel size the new image
// is given.
func DimensionChanger(img draw.Image, w, h int) draw.Image {
b := img.Bounds().Canon()
return &dimensionChanger{
Image: img,
paddingX: b.Dx() % w,
paddingY: b.Dy() % h,
pixel: image.Rect(0, 0, b.Dx()/w, b.Dy()/h),
bounds: image.Rect(0, 0, w, h),
}
}
// TransformCenter applies the affine transform to src and produces dst.
// Equivalent to
// a.CenterFit(dst, src).Transform(dst, src, i).
func (a Affine) TransformCenter(dst draw.Image, src image.Image, i interp.Interp) error {
if dst == nil {
return errors.New("graphics: dst is nil")
}
if src == nil {
return errors.New("graphics: src is nil")
}
return a.CenterFit(dst.Bounds(), src.Bounds()).Transform(dst, src, i)
}
// NewBackground creates a new Background object that
// draws to img, and draws the actual background with bg.
// The flush function, if non-nil, will be called to
// whenever changes are to be made visible externally
// (for example when Flush() is called.
//
// Note that bg is drawn with the draw.Src operation,
// so it is possible to create images with a transparent
// background.
//
func NewBackground(img draw.Image, bg image.Image, flush func(r image.Rectangle)) *Background {
r := img.Bounds()
return &Background{
img: img,
bg: bg,
r: r,
flushrect: r,
imgflush: flush,
}
}
// SliceImage returns an image which is a view onto a portion of img.
// The returned image has the specified width and height,
// but all draw operations are clipped to r.
// The origin of img is aligned with p. Where img
// overlaps with r, it will be used for drawing operations.
//
func SliceImage(width, height int, r image.Rectangle, img draw.Image, p image.Point) draw.Image {
// TODO: detect when img is itself a SliceImage and
// use the underlying image directly.
i := new(imageSlice)
i.img = img
i.r = r.Intersect(image.Rectangle{p, p.Add(img.Bounds().Size())})
//debugp("actual sliced rectangle %v\n", i.r)
i.p = p
return i
}
// DrawLinear draws a linear gradient to dst. If the gradient vector (as
// defined by x0, y0, x1, and y1) is found to be purely horizontal or purely
// vertical, the appropriate optimized functions will be called.
func DrawLinear(dst draw.Image, x0, y0, x1, y1 float64, stops []Stop) {
if y0 == y1 && x0 != x1 {
drawHLinear(dst, x0, x1, stops)
return
}
if x0 == x1 && y0 != y1 {
drawVLinear(dst, y0, y1, stops)
return
}
if len(stops) == 0 {
return
}
if y0 > y1 {
panic(fmt.Sprintf("invalid bounds y0(%f)>y1(%f)", y0, y1))
}
if x0 > x1 {
panic(fmt.Sprintf("invalid bounds x0(%f)>x1(%f)", x0, x1))
}
bb := dst.Bounds()
width, height := bb.Dx(), bb.Dy()
x0, y0 = x0*float64(width), y0*float64(height)
x1, y1 = x1*float64(width), y1*float64(height)
dx, dy := x1-x0, y1-y0
px0, py0 := x0-dy, y0+dx
mag := math.Hypot(dx, dy)
var col color.Color
for y := 0; y < width; y++ {
fy := float64(y)
for x := 0; x < width; x++ {
fx := float64(x)
// is the pixel before the start of the gradient?
s0 := (px0-x0)*(fy-y0) - (py0-y0)*(fx-x0)
if s0 > 0 {
col = stops[0].Col
} else {
// calculate the distance of the pixel from the first stop line
u := ((fx-x0)*(px0-x0) + (fy-y0)*(py0-y0)) /
(mag * mag)
x2, y2 := x0+u*(px0-x0), y0+u*(py0-y0)
d := math.Hypot(fx-x2, fy-y2) / mag
col = getColour(d, stops)
}
dst.Set(x+bb.Min.X, y+bb.Min.Y, col)
}
}
}
// RenderCPU implements the Renderer interface.
func (frac *FractionRenderer) RenderCPU(img draw.Image, cpu CPU) {
rect := img.Bounds()
utilized := cpu.FracUtil()
utilizedHeight := int(float64(rect.Dy()) * utilized)
yoffset := rect.Dy() - utilizedHeight
rect.Min = rect.Min.Add(image.Pt(0, yoffset))
img = SubImage(img, rect)
frac.Renderer.RenderCPU(img, cpu)
}
func (p *Drawer) NoAddMerge(img draw.Image) {
dest := p.Img
srcBounds := img.Bounds()
destB := dest.Bounds()
destRect := srcBounds.Sub(srcBounds.Min).Add(destB.Min)
source := img
sourcePt := srcBounds.Min
maskPt := destRect.Min
mask := p.Img
draw.DrawMask(dest, destRect, source, sourcePt, mask, maskPt, draw.Over)
}
func (l limits) translate(p DataPoint, i draw.Image, dotsize int) (rv image.Point) {
// Normalize to 0-1
x := float64(p.X()-l.Min.X()) / float64(l.Dx())
y := float64(p.Y()-l.Min.Y()) / float64(l.Dy())
// And remap to the image
rv.X = int(x * float64((i.Bounds().Max.X - dotsize)))
rv.Y = int((1.0 - y) * float64((i.Bounds().Max.Y - dotsize)))
return
}
func drawImg(dst draw.Image, asset string, err error) error {
if err != nil {
return err
}
src, _, err := image.Decode(bytes.NewReader(MustAsset(asset)))
if err != nil {
return err
}
draw.Draw(dst, dst.Bounds(), src, image.Point{0, 0}, draw.Over)
return nil
}
// clip clips r against each image's bounds (after translating into
// the destination image's co-ordinate space) and shifts the point
// sp by the same amount as the change in r.Min.
func clip(dst draw.Image, r *image.Rectangle, src image.Image, sp *image.Point) {
orig := r.Min
*r = r.Intersect(dst.Bounds())
*r = r.Intersect(src.Bounds().Add(orig.Sub(*sp)))
dx := r.Min.X - orig.X
dy := r.Min.Y - orig.Y
if dx == 0 && dy == 0 {
return
}
(*sp).X += dx
(*sp).Y += dy
}
// Copy copies src to dst.
func Copy(dst draw.Image, src image.Image) {
bd := src.Bounds().Intersect(dst.Bounds())
at := NewAtFunc(src)
set := NewSetFunc(dst)
Parallel(bd, func(bd image.Rectangle) {
for y := bd.Min.Y; y < bd.Max.Y; y++ {
for x := bd.Min.X; x < bd.Max.X; x++ {
r, g, b, a := at(x, y)
set(x, y, r, g, b, a)
}
}
})
}
func noise(src draw.Image) {
orig := src.Bounds()
numToMod := (orig.Max.X * orig.Max.Y) / 2
for i := 0; i < numToMod; i++ {
x := rand.Intn(orig.Max.X)
y := rand.Intn(orig.Max.Y)
origColor := src.At(x, y).(color.RGBA)
origColor.R += 30
origColor.B += 30
origColor.G += 30
src.Set(x, y, origColor)
}
}
// NewGraphicContextWithPainter creates a new Graphic context from an image and a Painter (see Freetype-go)
func NewGraphicContextWithPainter(img draw.Image, painter Painter) *ImageGraphicContext {
width, height := img.Bounds().Dx(), img.Bounds().Dy()
dpi := 92
gc := &ImageGraphicContext{
NewStackGraphicContext(),
img,
painter,
raster.NewRasterizer(width, height),
raster.NewRasterizer(width, height),
truetype.NewGlyphBuf(),
dpi,
}
return gc
}
// SubImage extracts a rectangular subset of img as a separate image.
// If present, the `SubImage()` method will be used. Otherwise, the
// behaviour will be emulated.
func SubImage(img draw.Image, r image.Rectangle) draw.Image {
if di, ok := img.(subimager); ok {
si := di.SubImage(r)
dsi, ok := si.(draw.Image)
if !ok {
panic("Image is drawable, subimage is not.")
}
return dsi
}
return &subimage{
Image: img,
bounds: img.Bounds().Intersect(r),
}
}