func NewPicture(bounds image.Rectangle) *Picture {
return &Picture{
Data: make([]float64, bounds.Dx()*bounds.Dy()),
Gamma: 1.0, //2.2,
Rect: bounds,
}
}
// Resample returns a resampled copy of the image slice r of m.
// The returned image has width w and height h.
func Resample(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))
}
img := image.NewRGBA(image.Rect(0, 0, w, h))
xStep := float64(r.Dx()) / float64(w)
yStep := float64(r.Dy()) / float64(h)
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
xSrc := int(float64(r.Min.X) + float64(x)*xStep)
ySrc := int(float64(r.Min.Y) + float64(y)*yStep)
r, g, b, a := m.At(xSrc, ySrc).RGBA()
img.SetRGBA(x, y, color.RGBA{
R: uint8(r >> 8),
G: uint8(g >> 8),
B: uint8(b >> 8),
A: uint8(a >> 8),
})
}
}
return img
}
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 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 MakeWithData(r image.Rectangle, pix []byte) *Image {
return &Image{
Pix: pix,
Stride: r.Dx() * 3,
Rect: image.Rect(0, 0, r.Dx(), r.Dy()),
}
}
func (ts *ThumbnailSpec) CalculateRect(rect image.Rectangle) (w int, h int) {
if ts.Width == 0 && ts.Height == 0 {
panic("tenpu/thumbnails: must provide width, or height for thumbnails.")
}
if ts.Height == 0 {
w = ts.Width
h = int((float64(ts.Width) / float64(rect.Dx())) * float64(rect.Dy()))
return
}
if ts.Width == 0 {
h = ts.Height
w = int((float64(ts.Height) / float64(rect.Dy())) * float64(rect.Dx()))
return
}
if (float64(ts.Width)/float64(rect.Dx()))*float64(rect.Dy()) > float64(ts.Height) {
h = ts.Height
w = int((float64(ts.Height) / float64(rect.Dy())) * float64(rect.Dx()))
return
}
w = ts.Width
h = int((float64(ts.Width) / float64(rect.Dx())) * float64(rect.Dy()))
return
}
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 RelBounds(r, b image.Rectangle) (n Bounds) {
n.Min.X = float32(r.Min.X-b.Min.X) / float32(b.Dx())
n.Min.Y = float32(r.Min.Y-b.Min.Y) / float32(b.Dy())
n.Max.X = float32(r.Max.X-b.Min.X) / float32(b.Dx())
n.Max.Y = float32(r.Max.Y-b.Min.Y) / float32(b.Dy())
return n
}
func newEanCoordinateConverter(outerBound image.Rectangle, fm fontMeasurer) (*eanCoordinateConverter, error) {
const rightMargin = digitBarSize
const logicalWidth = 13*digitBarSize + startMarkerSize + endMarkerSize + centerMarkerSize + rightMargin
scale := outerBound.Dx() / logicalWidth
if scale <= 0 {
return nil, errAreaTooSmall
}
xMargin := (outerBound.Dx() % logicalWidth) / 2
fSize, fWidth, fHeight := fm(digitBarSize * scale)
if digitBarSize*scale < fWidth {
return nil, errFontTooBig
}
if outerBound.Dy() < fHeight*2 {
return nil, errAreaTooSmall
}
return &eanCoordinateConverter{
bound: image.Rectangle{
Min: outerBound.Min.Add(image.Pt(xMargin, 0)),
Max: outerBound.Max.Sub(image.Pt(xMargin, 0)),
},
fontDim: image.Rect(0, 0, fWidth, fHeight),
scale: scale,
fontSize: fSize,
}, nil
}
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
}
// 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
}
// 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,
}
}
// 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,
}
}
// 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 (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
}
// CenterFit produces the affine transform, centered around the rectangles.
// It is equivalent to
// I.Translate(-<center of src>).Mul(a).Translate(<center of dst>)
func (a Affine) CenterFit(dst, src image.Rectangle) Affine {
dx := float64(dst.Min.X) + float64(dst.Dx())/2
dy := float64(dst.Min.Y) + float64(dst.Dy())/2
sx := float64(src.Min.X) + float64(src.Dx())/2
sy := float64(src.Min.Y) + float64(src.Dy())/2
return I.Translate(-sx, -sy).Mul(a).Translate(dx, dy)
}
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
}
}
// 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 AverageNRGBA64(rect image.Rectangle, img *image.NRGBA64) color.NRGBA64 {
// Only use the area of the rectangle that overlaps with the image bounds.
rect = rect.Intersect(img.Bounds())
// Determine whether or not there's any area over which to determine an
// average.
d := uint64(rect.Dx() * rect.Dy())
if d == 0 {
return color.NRGBA64{}
}
var r, g, b, a uint64
AllPointsRP(
func(pt image.Point) {
c := img.NRGBA64At(pt.X, pt.Y)
r += uint64(c.R)
g += uint64(c.G)
b += uint64(c.B)
a += uint64(c.A)
},
)(rect)
return color.NRGBA64{
R: uint16(r / d),
G: uint16(g / d),
B: uint16(b / d),
A: uint16(a / d),
}
}
// 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
}
func (opts *DecodeOpts) wantRescale(b image.Rectangle) bool {
return opts != nil &&
(opts.MaxWidth > 0 && opts.MaxWidth < b.Dx() ||
opts.MaxHeight > 0 && opts.MaxHeight < b.Dy() ||
opts.ScaleWidth > 0.0 && opts.ScaleWidth < float32(b.Dx()) ||
opts.ScaleHeight > 0.0 && opts.ScaleHeight < float32(b.Dy()))
}
func (a *area) Repaint(r image.Rectangle) {
r = image.Rect(0, 0, a.width, a.height).Intersect(r)
if r.Empty() {
return
}
println(a._widget, C.gint(r.Min.X), C.gint(r.Min.Y), C.gint(r.Dx()), C.gint(r.Dy()))
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 saneRectangle(rect image.Rectangle) image.Rectangle {
rect = rect.Canon()
width, height := rect.Dx(), rect.Dy()
if width < 1 || width > 4096 || height < 1 || height > 4096 {
return image.Rect(0, 0, 16, 16)
}
return rect
}
// New creates a new Frame bounded by a rectangle r
func New(r image.Rectangle) *Frame {
var w, h = r.Dx(), r.Dy()
return &Frame{
Data: make([]Cell, w*h),
Bounds: r,
Stride: r.Dx(),
}
}
//DrawElementsInArea is used for redrawing
func (b *Backend) DrawElementsInArea(l gs.DrawPriorityList, area image.Rectangle) {
gl.Enable(gl.SCISSOR_TEST)
gl.Scissor(area.Min.X, area.Min.Y, area.Dx(), area.Dy())
for _, o := range l {
o.Draw(b)
}
gl.Disable(gl.SCISSOR_TEST)
}
// SetOrtho sets this camera's Projection matrix to an orthographic one.
//
// The view parameter is the viewing rectangle for the orthographic
// projection in window coordinates.
//
// The near and far parameters describe the minimum closest and maximum
// furthest clipping points of the view frustum.
//
// Clients who need advanced control over how the orthographic viewing frustum
// is set up may use this method's source as a reference (e.g. to change the
// center point, which this method sets at the bottom-left).
//
// Write access is required for this method to operate safely.
func (c *Camera) SetOrtho(view image.Rectangle, near, far float64) {
w := float64(view.Dx())
w = float64(int((w / 2.0)) * 2)
h := float64(view.Dy())
h = float64(int((h / 2.0)) * 2)
m := math.Mat4Ortho(0, w, 0, h, near, far)
c.Projection = ConvertMat4(m)
}
func (p *transformFilter) Bounds(srcBounds image.Rectangle) (dstBounds image.Rectangle) {
if p.tt == ttRotate90 || p.tt == ttRotate270 || p.tt == ttTranspose || p.tt == ttTransverse {
dstBounds = image.Rect(0, 0, srcBounds.Dy(), srcBounds.Dx())
} else {
dstBounds = image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
}
return
}
// Create a new Image64 with the rectangle's width and height.
func NewImage64(r image.Rectangle) *Image64 {
width, height := r.Dx(), r.Dy()
return &Image64{
Pix: make([]Color64, width*height),
Stride: width,
Rect: image.Rectangle{image.ZP, image.Point{width, height}},
}
}
// Scale implements the Scale method of the screen.Drawer interface by calling
// the Draw method of that same interface.
func Scale(dst screen.Drawer, dr image.Rectangle, src screen.Texture, sr image.Rectangle, op draw.Op, opts *screen.DrawOptions) {
rx := float64(dr.Dx()) / float64(sr.Dx())
ry := float64(dr.Dy()) / float64(sr.Dy())
dst.Draw(f64.Aff3{
rx, 0, float64(dr.Min.X) - rx*float64(sr.Min.X),
0, ry, float64(dr.Min.Y) - ry*float64(sr.Min.Y),
}, src, sr, op, opts)
}
func NewBuffered(r image.Rectangle, border termbox.Cell) *Buffered {
b := &Buffered{
Unbuffered: Unbuffered{r: r, border: border},
buffer: make([]termbox.Cell, r.Dx()*r.Dy()),
}
b.Clear()
return b
}