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PDF: fix warnings font font type vs font file contents thrown by pdft…
…otext, see #332
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| package gio | ||
|
|
||
| import ( | ||
| "image" | ||
| "image/color" | ||
|
|
||
| "gioui.org/f32" | ||
| "gioui.org/layout" | ||
| "gioui.org/op" | ||
| "gioui.org/op/clip" | ||
| "gioui.org/op/paint" | ||
| "github.com/tdewolff/canvas" | ||
| ) | ||
|
|
||
| type Gio struct { | ||
| ops *op.Ops | ||
| width, height float64 | ||
| xScale, yScale float64 | ||
| dimensions layout.Dimensions | ||
| } | ||
|
|
||
| // New returns a Gio renderer of fixed size. | ||
| func New(gtx layout.Context, width, height float64) *Gio { | ||
| dimensions := layout.Dimensions{Size: image.Point{int(width + 0.5), int(height + 0.5)}} | ||
| return &Gio{ | ||
| ops: gtx.Ops, | ||
| width: width, | ||
| height: height, | ||
| xScale: 1.0, | ||
| yScale: 1.0, | ||
| dimensions: dimensions, | ||
| } | ||
| } | ||
|
|
||
| // NewContain returns a Gio renderer that fills the constraints either horizontally or vertically, whichever is met first. | ||
| func NewContain(gtx layout.Context, width, height float64) *Gio { | ||
| xScale := float64(gtx.Constraints.Max.X-gtx.Constraints.Min.X) / width | ||
| yScale := float64(gtx.Constraints.Max.Y-gtx.Constraints.Min.Y) / height | ||
| if yScale < xScale { | ||
| xScale = yScale | ||
| } else { | ||
| yScale = xScale | ||
| } | ||
|
|
||
| dimensions := layout.Dimensions{Size: image.Point{int(width*xScale + 0.5), int(height*yScale + 0.5)}} | ||
| return &Gio{ | ||
| ops: gtx.Ops, | ||
| width: width, | ||
| height: height, | ||
| xScale: xScale, | ||
| yScale: yScale, | ||
| dimensions: dimensions, | ||
| } | ||
| } | ||
|
|
||
| // NewStretch returns a Gio renderer that stretches the view to fit the constraints. | ||
| func NewStretch(gtx layout.Context, width, height float64) *Gio { | ||
| xScale := float64(gtx.Constraints.Max.X-gtx.Constraints.Min.X) / width | ||
| yScale := float64(gtx.Constraints.Max.Y-gtx.Constraints.Min.Y) / height | ||
|
|
||
| dimensions := layout.Dimensions{Size: image.Point{int(width*xScale + 0.5), int(height*yScale + 0.5)}} | ||
| return &Gio{ | ||
| ops: gtx.Ops, | ||
| width: width, | ||
| height: height, | ||
| xScale: xScale, | ||
| yScale: yScale, | ||
| dimensions: dimensions, | ||
| } | ||
| } | ||
|
|
||
| // Dimensions returns the dimensions for Gio. | ||
| func (r *Gio) Dimensions() layout.Dimensions { | ||
| return r.dimensions | ||
| } | ||
|
|
||
| // Size returns the size of the canvas in millimeters. | ||
| func (r *Gio) Size() (float64, float64) { | ||
| return r.width, r.height | ||
| } | ||
|
|
||
| func (r *Gio) point(p canvas.Point) f32.Point { | ||
| return f32.Point{float32(r.xScale * p.X), float32(r.yScale * (r.height - p.Y))} | ||
| } | ||
|
|
||
| func (r *Gio) renderPath(path *canvas.Path, fill canvas.Paint) { | ||
| path = path.ReplaceArcs() | ||
|
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| p := clip.Path{} | ||
| p.Begin(r.ops) | ||
| for scanner := path.Scanner(); scanner.Scan(); { | ||
| switch scanner.Cmd() { | ||
| case canvas.MoveToCmd: | ||
| p.MoveTo(r.point(scanner.End())) | ||
| case canvas.LineToCmd: | ||
| p.LineTo(r.point(scanner.End())) | ||
| case canvas.QuadToCmd: | ||
| p.QuadTo(r.point(scanner.CP1()), r.point(scanner.End())) | ||
| case canvas.CubeToCmd: | ||
| p.CubeTo(r.point(scanner.CP1()), r.point(scanner.CP2()), r.point(scanner.End())) | ||
| case canvas.ArcToCmd: | ||
| // TODO: ArcTo | ||
| p.LineTo(r.point(scanner.End())) | ||
| case canvas.CloseCmd: | ||
| p.Close() | ||
| } | ||
| } | ||
|
|
||
| shape := clip.Outline{p.End()} | ||
| defer shape.Op().Push(r.ops).Pop() | ||
|
|
||
| if fill.IsColor() { | ||
| paint.Fill(r.ops, toNRGBA(fill.Color)) | ||
| } else if fill.IsGradient() { | ||
| if g, ok := fill.Gradient.(*canvas.LinearGradient); ok && len(g.Stops) == 2 { | ||
| linearGradient := paint.LinearGradientOp{} | ||
| linearGradient.Stop1 = r.point(g.Start) | ||
| linearGradient.Stop2 = r.point(g.End) | ||
| linearGradient.Color1 = toNRGBA(g.Stops[0].Color) | ||
| linearGradient.Color2 = toNRGBA(g.Stops[1].Color) | ||
| linearGradient.Add(r.ops) | ||
| paint.PaintOp{}.Add(r.ops) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // RenderPath renders a path to the canvas using a style and a transformation matrix. | ||
| func (r *Gio) RenderPath(path *canvas.Path, style canvas.Style, m canvas.Matrix) { | ||
| if style.HasFill() { | ||
| r.renderPath(path.Copy().Transform(m), style.Fill) | ||
| } | ||
|
|
||
| if style.HasStroke() { | ||
| if style.IsDashed() { | ||
| dashOffset, dashes := canvas.ScaleDash(style.StrokeWidth, style.DashOffset, style.Dashes) | ||
| path = path.Dash(dashOffset, dashes...) | ||
| } | ||
| path = path.Stroke(style.StrokeWidth, style.StrokeCapper, style.StrokeJoiner, canvas.Tolerance) | ||
| r.renderPath(path.Transform(m), style.Stroke) | ||
| } | ||
| } | ||
|
|
||
| // RenderText renders a text object to the canvas using a transformation matrix. | ||
| func (r *Gio) RenderText(text *canvas.Text, m canvas.Matrix) { | ||
| text.RenderAsPath(r, m, 0.0) | ||
| } | ||
|
|
||
| // RenderImage renders an image to the canvas using a transformation matrix. | ||
| func (r *Gio) RenderImage(img image.Image, m canvas.Matrix) { | ||
| paint.NewImageOp(img).Add(r.ops) | ||
| m = canvas.Identity.Scale(r.xScale, r.yScale).Mul(m) | ||
| m = m.Translate(0.0, float64(img.Bounds().Max.Y)) | ||
| trans := op.Affine(f32.NewAffine2D( | ||
| float32(m[0][0]), -float32(m[0][1]), float32(m[0][2]), | ||
| -float32(m[1][0]), float32(m[1][1]), float32(r.yScale*r.height-m[1][2]), | ||
| )).Push(r.ops) | ||
| paint.PaintOp{}.Add(r.ops) | ||
| trans.Pop() | ||
| } | ||
|
|
||
| func toNRGBA(col color.Color) color.NRGBA { | ||
| r, g, b, a := col.RGBA() | ||
| if a == 0 { | ||
| return color.NRGBA{} | ||
| } | ||
| r = (r * 0xffff) / a | ||
| g = (g * 0xffff) / a | ||
| b = (b * 0xffff) / a | ||
| return color.NRGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: uint8(a >> 8)} | ||
| } |
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