func traverseTiles(Style style, Area area) (image.Image, error) {
m := image.NewRGBA(image.Rect(-Margins, -Margins, Area.TileRange.Dx()*TileSize+Margins, Area.TileRange.Dy()*TileSize+Margins))
whiteColor := color.RGBA{255, 255, 255, 255}
draw.Draw(m, m.Bounds(), &image.Uniform{whiteColor}, image.ZP, draw.Src)
frameColor := color.RGBA{50, 50, 50, 255}
draw.Draw(m, image.Rect(-Frame, -Frame, Area.TileRange.Dx()*TileSize+Frame, Area.TileRange.Dy()*TileSize+Frame), &image.Uniform{frameColor}, image.ZP, draw.Src)
position := image.Rectangle{image.ZP, image.Point{X: TileSize, Y: TileSize}}
for y := Area.TileRange.Min.Y; y < Area.TileRange.Max.Y; y++ {
for x := Area.TileRange.Min.X; x < Area.TileRange.Max.X; x++ {
img, err := readTile(Style.Mapid, Area.Z, uint(x), uint(y))
if err != nil {
fmt.Printf("no luck reading this tile: z:%v, %vx %v \n", Area.Z, x, y)
fmt.Println(err)
break
}
fmt.Printf("...adding %vx%v \n", x, y)
draw.Draw(m, position, img, image.ZP, draw.Src)
position = position.Add(image.Point{X: TileSize, Y: 0})
}
position = image.Rectangle{image.Point{X: 0, Y: (y - Area.TileRange.Min.Y + 1) * TileSize}, image.Point{X: TileSize, Y: (y - Area.TileRange.Min.Y + 2) * TileSize}}
}
fmt.Println("Great success!")
return m, nil
}
// SubImage returns an image representing the portion of the image p visible
// through r. The returned value shares pixels with the original image.
func (p *Image) SubImage(r image.Rectangle) image.Image {
// TODO: share code with image.NewYCbCr when this type moves into the
// standard image package.
r = r.Intersect(p.Rect)
// If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside
// either r1 or r2 if the intersection is empty. Without explicitly checking for
// this, the Pix[i:] expression below can panic.
if r.Empty() {
return &Image{
YCbCr: image.YCbCr{
SubsampleRatio: p.SubsampleRatio,
},
}
}
yi := p.YOffset(r.Min.X, r.Min.Y)
ci := p.COffset(r.Min.X, r.Min.Y)
ai := p.AOffset(r.Min.X, r.Min.Y)
return &Image{
YCbCr: image.YCbCr{
Y: p.Y[yi:],
Cb: p.Cb[ci:],
Cr: p.Cr[ci:],
SubsampleRatio: p.SubsampleRatio,
YStride: p.YStride,
CStride: p.CStride,
Rect: r,
},
A: p.A[ai:],
AStride: p.AStride,
}
}
// New returns a new Image with the given bounds and subsample ratio.
func New(r image.Rectangle, subsampleRatio image.YCbCrSubsampleRatio) *Image {
// TODO: share code with image.NewYCbCr when this type moves into the
// standard image package.
w, h, cw, ch := r.Dx(), r.Dy(), 0, 0
switch subsampleRatio {
case image.YCbCrSubsampleRatio422:
cw = (r.Max.X+1)/2 - r.Min.X/2
ch = h
case image.YCbCrSubsampleRatio420:
cw = (r.Max.X+1)/2 - r.Min.X/2
ch = (r.Max.Y+1)/2 - r.Min.Y/2
case image.YCbCrSubsampleRatio440:
cw = w
ch = (r.Max.Y+1)/2 - r.Min.Y/2
default:
// Default to 4:4:4 subsampling.
cw = w
ch = h
}
b := make([]byte, 2*w*h+2*cw*ch)
// TODO: use s[i:j:k] notation to set the cap.
return &Image{
YCbCr: image.YCbCr{
Y: b[:w*h],
Cb: b[w*h+0*cw*ch : w*h+1*cw*ch],
Cr: b[w*h+1*cw*ch : w*h+2*cw*ch],
SubsampleRatio: subsampleRatio,
YStride: w,
CStride: cw,
Rect: r,
},
A: b[w*h+2*cw*ch:],
AStride: w,
}
}
func (opts *DecodeOpts) wantRescale(b image.Rectangle, swapDimensions bool) bool {
if opts == nil {
return false
}
// In rescale Scale* trumps Max* so we assume the same relationship here.
// Floating point compares probably only allow this to work if the values
// were specified as the literal 1 or 1.0, computed values will likely be
// off. If Scale{Width,Height} end up being 1.0-epsilon we'll rescale
// when it probably wouldn't even be noticible but that's okay.
if opts.ScaleWidth == 1.0 && opts.ScaleHeight == 1.0 {
return false
}
if opts.ScaleWidth > 0 && opts.ScaleWidth < 1.0 ||
opts.ScaleHeight > 0 && opts.ScaleHeight < 1.0 {
return true
}
w, h := b.Dx(), b.Dy()
if swapDimensions {
w, h = h, w
}
// Same size, don't rescale.
if opts.MaxWidth == w && opts.MaxHeight == h {
return false
}
return opts.MaxWidth > 0 && opts.MaxWidth < w ||
opts.MaxHeight > 0 && opts.MaxHeight < h
}
// Trimmed ...
func (t *Tree) Trimmed() *Tree {
var leafs []image.Rectangle
t.Visit(func(other *Tree) {
if len(other.points) == 0 {
return
}
leafs = append(leafs, image.Rectangle{
Min: other.Extents.Min,
Max: other.Extents.Max,
})
})
var r *image.Rectangle
for _, b := range leafs {
if r == nil {
r = new(image.Rectangle)
*r = b
continue
}
*r = r.Union(b)
}
tr := New(*r, t.capacity)
t.Visit(func(other *Tree) {
for p := range other.points {
tr.Insert(p)
}
})
return tr
}
// 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
}
// PackHorzontal finds the Pos for a horizontally packed sprite
func (l *Sprite) PackHorizontal(pos int) Pos {
if pos == -1 || pos == 0 {
return Pos{0, 0}
}
var x, y int
var rect image.Rectangle
l.optsMu.RLock()
padding := l.opts.Padding
l.optsMu.RUnlock()
// there are n-1 paddings in an image list
x = padding * pos
// No padding on the outside of the image
numimages := l.Len()
if pos == numimages {
x -= padding
}
for i := 1; i <= pos; i++ {
l.goImagesMu.RLock()
rect = l.imgs[i-1].Bounds()
l.goImagesMu.RUnlock()
x += rect.Dx()
if pos == numimages {
y = int(math.Max(float64(y), float64(rect.Dy())))
}
}
return Pos{
x, y,
}
}
func checkPsnrs(t *testing.T, ref, img image.Image, sub image.Rectangle, min []float64) {
var a, b image.Image
a, b = ref, img
if !sub.Empty() {
switch a.(type) {
case *image.RGBA:
a = a.(*image.RGBA).SubImage(sub)
b = b.(*image.RGBA).SubImage(sub)
case *image.NRGBA:
a = a.(*image.NRGBA).SubImage(sub)
b = b.(*image.NRGBA).SubImage(sub)
case *image.YCbCr:
a = a.(*image.YCbCr).SubImage(sub)
b = b.(*image.YCbCr).SubImage(sub)
case *image.Gray:
a = a.(*image.Gray).SubImage(sub)
b = b.(*image.Gray).SubImage(sub)
}
}
psnrs, err := Psnr(a, b)
expect(t, err, nil)
for i, v := range psnrs {
if v < min[i] {
t.Fatalf("invalid psnr %v < %v\n", v, min[i])
}
}
}
func Make(r image.Rectangle) *Image {
return &Image{
Pix: make([]byte, r.Dx()*r.Dy()*3),
Stride: r.Dx() * 3,
Rect: image.Rect(0, 0, r.Dx(), r.Dy()),
}
}
func (a *area) Repaint(r image.Rectangle) {
r = image.Rect(0, 0, a.width, a.height).Intersect(r)
if r.Empty() {
return
}
C.gtk_widget_queue_draw_area(a.widget, C.gint(r.Min.X), C.gint(r.Min.Y), C.gint(r.Dx()), C.gint(r.Dy()))
}
func (p *resizeToFitFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
w, h := p.width, p.height
srcw, srch := srcBounds.Dx(), srcBounds.Dy()
if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
return image.Rect(0, 0, 0, 0)
}
if srcw <= w && srch <= h {
return image.Rect(0, 0, srcw, srch)
}
wratio := float64(srcw) / float64(w)
hratio := float64(srch) / float64(h)
var dstw, dsth int
if wratio > hratio {
dstw = w
dsth = minint(int(float64(srch)/wratio+0.5), h)
} else {
dsth = h
dstw = minint(int(float64(srcw)/hratio+0.5), w)
}
return image.Rect(0, 0, dstw, dsth)
}
func imfilter(filter [][]float32, rect image.Rectangle, rgbFunc func(xpos, ypos int) (r0, g0, b0, a0 uint8), mergFunc func(a, b float32) float32) *image.RGBA {
wg := sync.WaitGroup{}
size := rect.Size()
imgGrey := image.NewRGBA(rect)
fX := len(filter)
fY := len(filter[0])
xoffset := fX / 2
yoffset := fY / 2
threadCount := (fX + fY) / 2
sizeoffset := (size.X - fX) / threadCount
timeStart := time.Now()
wg.Add(threadCount)
for i := 0; i < threadCount; i++ {
go func(i int) {
for x := xoffset + i*sizeoffset; x < xoffset+(i+1)*sizeoffset; x++ {
for y := yoffset; y < size.Y-yoffset; y++ {
newColor := imfilterMerg(filter, fX, fY, x, y, xoffset, yoffset, rgbFunc, mergFunc)
imgGrey.SetRGBA(x, y, newColor)
}
}
wg.Done()
}(i)
}
wg.Wait()
fmt.Println("Filt Time", time.Now().Sub(timeStart))
return imgGrey
}
func NewPicture(bounds image.Rectangle) *Picture {
return &Picture{
Data: make([]float64, bounds.Dx()*bounds.Dy()),
Gamma: 1.0, //2.2,
Rect: bounds,
}
}
func (v *platformView) drawScene(r image.Rectangle) {
//log.Printf("platformView.drawScene %v\n", r)
x, y, w, h := r.Min.X, r.Min.Y, r.Size().X, r.Size().Y
v.area.QueueDrawArea(v.parent.ScaleCoord(x, false), v.parent.ScaleCoord(y, false),
v.parent.ScaleCoord(w, true)+1, v.parent.ScaleCoord(h, true)+1)
return
}
// NewYCbCrAligned Allocates YCbCr image with padding.
// Because LibJPEG needs extra padding to decoding buffer, This func add an
// extra alignSize (16) padding to cover overflow from any such modes.
func NewYCbCrAligned(r image.Rectangle, subsampleRatio image.YCbCrSubsampleRatio) *image.YCbCr {
w, h, cw, ch := r.Dx(), r.Dy(), 0, 0
switch subsampleRatio {
case image.YCbCrSubsampleRatio422:
cw = (r.Max.X+1)/2 - r.Min.X/2
ch = h
case image.YCbCrSubsampleRatio420:
cw = (r.Max.X+1)/2 - r.Min.X/2
ch = (r.Max.Y+1)/2 - r.Min.Y/2
case image.YCbCrSubsampleRatio440:
cw = w
ch = (r.Max.Y+1)/2 - r.Min.Y/2
default:
cw = w
ch = h
}
// TODO: check the padding size to minimize memory allocation.
yStride := pad(w, alignSize) + alignSize
cStride := pad(cw, alignSize) + alignSize
yHeight := pad(h, alignSize) + alignSize
cHeight := pad(ch, alignSize) + alignSize
b := make([]byte, yStride*yHeight+2*cStride*cHeight)
return &image.YCbCr{
Y: b[:yStride*yHeight],
Cb: b[yStride*yHeight+0*cStride*cHeight : yStride*yHeight+1*cStride*cHeight],
Cr: b[yStride*yHeight+1*cStride*cHeight : yStride*yHeight+2*cStride*cHeight],
SubsampleRatio: subsampleRatio,
YStride: yStride,
CStride: cStride,
Rect: r,
}
}
// New allocates and initializes a new DockApp. NewDockApp does not initialize
// the window contents and does not map the window to the display screen. The
// window is mapped to the screen when the Main method is called on the
// returned DockApp.
func New(x *xgbutil.XUtil, rect image.Rectangle) (*DockApp, error) {
win, err := xwindow.Generate(x)
if err != nil {
log.Fatalf("generate window: %v", err)
}
win.Create(x.RootWin(), 0, 0, rect.Size().X, rect.Size().Y, 0)
// Set WM hints so that Openbox puts the window into the dock.
hints := &icccm.Hints{
Flags: icccm.HintState | icccm.HintIconWindow,
InitialState: icccm.StateWithdrawn,
IconWindow: win.Id,
WindowGroup: win.Id,
}
err = icccm.WmHintsSet(x, win.Id, hints)
if err != nil {
win.Destroy()
return nil, fmt.Errorf("wm hints: %v", err)
}
img := xgraphics.New(x, rect)
err = img.XSurfaceSet(win.Id)
if err != nil {
img.Destroy()
win.Destroy()
return nil, fmt.Errorf("xsurface set: %v", err)
}
app := &DockApp{
x: x,
img: img,
win: win,
}
return app, nil
}
// Takes a bounding box in an image r.
// Coerces it to the aspect ratio of target.Int according to mode.
// Returns the rectangle which, when resized to target.Size,
// will have the bounding box in target.Int.
// Panics if the target has non-positive interior.
func FitRect(orig image.Rectangle, target PadRect, mode string) (scale float64, fit image.Rectangle) {
if target.Int.Dx() <= 0 || target.Int.Dy() <= 0 {
panic("empty interior")
}
if mode == "stretch" {
panic("stretch mode not supported by FitRect")
}
aspect := float64(target.Int.Dx()) / float64(target.Int.Dy())
// Width and height of box in image.
w, h := float64(orig.Dx()), float64(orig.Dy())
// Co-erce size to match aspect ratio.
w, h = SetAspect(w, h, aspect, mode)
// If source is smaller than target, then scale is > 1 (i.e. need to magnify).
scale = float64(target.Int.Dx()) / w // == float64(target.Int.Dy()) / h
// Get position of interior centroid in target rectangle.
left, top := centroid(target.Int)
right, bottom := float64(target.Size.X)-left, float64(target.Size.Y)-top
// Get position of centroid of original bounding box in image.
x, y := centroid(orig)
// Scale offsets on all sides and add to centroid for final rectangle.
// If scale is greater than 1 then source is smaller than target.
// Then the rectangle in the source image is shrunk (i.e. divide by scale).
x0, x1 := x-left/scale, x+right/scale
y0, y1 := y-top/scale, y+bottom/scale
fit = image.Rect(round(x0), round(y0), round(x1), round(y1))
return
}
// PackHorzontal finds the Pos for a horizontally packed sprite
func (l *ImageList) PackHorizontal(pos int) Pos {
if pos == -1 || pos == 0 {
return Pos{0, 0}
}
var x, y int
var rect image.Rectangle
// there are n-1 paddings in an image list
x = l.Padding * pos
// No padding on the outside of the image
if pos == len(l.GoImages) {
x -= l.Padding
}
for i := 1; i <= pos; i++ {
rect = l.GoImages[i-1].Bounds()
x += rect.Dx()
if pos == len(l.GoImages) {
y = int(math.Max(float64(y), float64(rect.Dy())))
}
}
return Pos{
x, y,
}
}
func (floydSteinberg) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point) {
clip(dst, &r, src, &sp, nil, nil)
if r.Empty() {
return
}
drawPaletted(dst, r, src, sp, true)
}
func drawGlyphOver(dst *image.RGBA, r image.Rectangle, src *image.Uniform, mask *image.Alpha, mp image.Point) {
i0 := dst.PixOffset(r.Min.X, r.Min.Y)
i1 := i0 + r.Dx()*4
mi0 := mask.PixOffset(mp.X, mp.Y)
sr, sg, sb, sa := src.RGBA()
for y, my := r.Min.Y, mp.Y; y != r.Max.Y; y, my = y+1, my+1 {
for i, mi := i0, mi0; i < i1; i, mi = i+4, mi+1 {
ma := uint32(mask.Pix[mi])
if ma == 0 {
continue
}
ma |= ma << 8
dr := uint32(dst.Pix[i+0])
dg := uint32(dst.Pix[i+1])
db := uint32(dst.Pix[i+2])
da := uint32(dst.Pix[i+3])
// The 0x101 is here for the same reason as in drawRGBA.
a := (m - (sa * ma / m)) * 0x101
dst.Pix[i+0] = uint8((dr*a + sr*ma) / m >> 8)
dst.Pix[i+1] = uint8((dg*a + sg*ma) / m >> 8)
dst.Pix[i+2] = uint8((db*a + sb*ma) / m >> 8)
dst.Pix[i+3] = uint8((da*a + sa*ma) / m >> 8)
}
i0 += dst.Stride
i1 += dst.Stride
mi0 += mask.Stride
}
}
func (c *NativeCanvas) BlitToContext(nc NativeContext, x int, y int, srcRc *image.Rectangle) {
// log.Printf("NativeCanvas.BlitToContext(...)")
var srcDC = c.BeginPaint()
if srcRc == nil {
var tempRc = image.Rect(0, 0, c.W(), c.H())
srcRc = &tempRc
}
var copyWidth = srcRc.Dx()
var copyHeight = srcRc.Dy()
if c.Opaque() {
// log.Printf("BitBlt(%v %v %v)", x, y, *srcRc)
var err = BitBlt(Handle(nc),
int32(x), int32(y), int32(copyWidth), int32(copyHeight),
Handle(srcDC),
int32(srcRc.Min.X), int32(srcRc.Min.Y),
SRCCOPY)
if err != nil {
log.Printf("BitBlt(...) %v", err)
}
} else {
var bf = BLENDFUNCTION{AC_SRC_OVER, 0, 255, AC_SRC_ALPHA}
GdiAlphaBlend(Handle(nc),
int32(x), int32(y), int32(copyWidth), int32(copyHeight),
Handle(srcDC),
int32(srcRc.Min.X), int32(srcRc.Min.Y), int32(copyWidth), int32(copyHeight),
bf)
}
c.EndPaint()
}
func drawGlyphOver(dst *image.RGBA, r image.Rectangle, src *image.ColorImage, mask *image.Alpha, mp image.Point) {
i0 := (r.Min.Y-dst.Rect.Min.Y)*dst.Stride + r.Min.X - dst.Rect.Min.X
i1 := i0 + r.Dx()
j0 := (mp.Y-mask.Rect.Min.Y)*mask.Stride + mp.X - mask.Rect.Min.X
cr, cg, cb, ca := src.RGBA()
for y, my := r.Min.Y, mp.Y; y != r.Max.Y; y, my = y+1, my+1 {
dpix := dst.Pix[i0:i1]
mpix := mask.Pix[j0:]
for i, rgba := range dpix {
ma := uint32(mpix[i].A)
if ma == 0 {
continue
}
ma |= ma << 8
dr := uint32(rgba.R)
dg := uint32(rgba.G)
db := uint32(rgba.B)
da := uint32(rgba.A)
// The 0x101 is here for the same reason as in drawRGBA.
a := (m - (ca * ma / m)) * 0x101
dr = (dr*a + cr*ma) / m
dg = (dg*a + cg*ma) / m
db = (db*a + cb*ma) / m
da = (da*a + ca*ma) / m
dpix[i] = image.RGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
}
i0 += dst.Stride
i1 += dst.Stride
j0 += mask.Stride
}
}
func (v *mappingView) drawArch(context *cairo.Context, r image.Rectangle) {
for _, a := range v.arch {
if r.Overlaps(a.BBox()) {
a.Draw(context)
}
}
}
func (buffer Image) CopyRGBA(src *image.RGBA, r image.Rectangle) {
// clip r against each image's bounds and move sp accordingly (see draw.clip())
sp := image.ZP
orig := r.Min
r = r.Intersect(buffer.Bounds())
r = r.Intersect(src.Bounds().Add(orig.Sub(sp)))
dx := r.Min.X - orig.X
dy := r.Min.Y - orig.Y
(sp).X += dx
(sp).Y += dy
i0 := (r.Min.X - buffer.Rect.Min.X) * 4
i1 := (r.Max.X - buffer.Rect.Min.X) * 4
si0 := (sp.X - src.Rect.Min.X) * 4
yMax := r.Max.Y - buffer.Rect.Min.Y
y := r.Min.Y - buffer.Rect.Min.Y
sy := sp.Y - src.Rect.Min.Y
for ; y != yMax; y, sy = y+1, sy+1 {
dpix := buffer.Pix[y*buffer.Stride:]
spix := src.Pix[sy*src.Stride:]
for i, si := i0, si0; i < i1; i, si = i+4, si+4 {
dpix[i+0] = spix[si+2]
dpix[i+1] = spix[si+1]
dpix[i+2] = spix[si+0]
dpix[i+3] = spix[si+3]
}
}
}
func (b *bufferImpl) upload(u screen.Uploader, xd xproto.Drawable, xg xproto.Gcontext, depth uint8,
dp image.Point, sr image.Rectangle, sender screen.Sender) {
b.preUpload(sender != nil)
// TODO: adjust if dp is outside dst bounds, or sr is outside src bounds.
dr := sr.Sub(sr.Min).Add(dp)
b.s.mu.Lock()
b.s.nPendingUploads++
b.s.mu.Unlock()
cookie := shm.PutImage(
b.s.xc, xd, xg,
uint16(b.size.X), uint16(b.size.Y), // TotalWidth, TotalHeight,
uint16(sr.Min.X), uint16(sr.Min.Y), // SrcX, SrcY,
uint16(dr.Dx()), uint16(dr.Dy()), // SrcWidth, SrcHeight,
int16(dr.Min.X), int16(dr.Min.Y), // DstX, DstY,
depth, xproto.ImageFormatZPixmap,
1, b.xs, 0, // 1 means send a completion event, 0 means a zero offset.
)
b.s.mu.Lock()
b.s.uploads[cookie.Sequence] = completion{
sender: sender,
event: screen.UploadedEvent{
Buffer: b,
Uploader: u,
},
}
b.s.nPendingUploads--
b.s.handleCompletions()
b.s.mu.Unlock()
}
func drawCopySrc(dst *image.RGBA, r image.Rectangle, src *image.RGBA, sp image.Point) {
n, dy := 4*r.Dx(), r.Dy()
d0 := dst.PixOffset(r.Min.X, r.Min.Y)
s0 := src.PixOffset(sp.X, sp.Y)
var ddelta, sdelta int
if r.Min.Y <= sp.Y {
ddelta = dst.Stride
sdelta = src.Stride
} else {
// If the source start point is higher than the destination start
// point, then we compose the rows in bottom-up order instead of
// top-down. Unlike the drawCopyOver function, we don't have to check
// the x coordinates because the built-in copy function can handle
// overlapping slices.
d0 += (dy - 1) * dst.Stride
s0 += (dy - 1) * src.Stride
ddelta = -dst.Stride
sdelta = -src.Stride
}
for ; dy > 0; dy-- {
copy(dst.Pix[d0:d0+n], src.Pix[s0:s0+n])
d0 += ddelta
s0 += sdelta
}
}
func Crop(m image.Image, r image.Rectangle, w, h int) image.Image {
if w < 0 || h < 0 {
return nil
}
if w == 0 || h == 0 || r.Dx() <= 0 || r.Dy() <= 0 {
return image.NewRGBA64(image.Rect(0, 0, w, h))
}
curw, curh := r.Min.X, r.Min.Y
img := image.NewRGBA(image.Rect(0, 0, w, h))
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
// Get a source pixel.
subx := curw + x
suby := curh + y
r32, g32, b32, a32 := m.At(subx, suby).RGBA()
r := uint8(r32 >> 8)
g := uint8(g32 >> 8)
b := uint8(b32 >> 8)
a := uint8(a32 >> 8)
img.SetRGBA(x, y, color.RGBA{r, g, b, a})
}
}
return img
}
func (v *mappingView) drawConnections(context *cairo.Context, r image.Rectangle) {
for _, c := range v.connections {
box := c.BBox()
if r.Overlaps(box) {
c.Draw(context)
}
}
}
func drawsq(b *draw.Image, p image.Point, ptx int) {
var r image.Rectangle
r.Min = p
r.Max.X = r.Min.X + pcsz
r.Max.Y = r.Min.Y + pcsz
b.Draw(r, display.Black, nil, image.ZP)
b.Draw(r.Inset(1), tx[ptx], nil, image.ZP)
}
// ToImageRect converts a point in the feature pyramid to a rectangle in the image.
func (pyr *Generator) ToImageRect(level int, pt image.Point, interior image.Rectangle) image.Rectangle {
// Translate interior by position (scaled by rate) and subtract margin offset.
rate := pyr.Transform.Rate()
offset := pyr.Pad.Margin.TopLeft()
scale := pyr.Image.Scales[level]
rect := interior.Add(pt.Mul(rate)).Sub(offset)
return scaleRect(1/scale, rect)
}