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main.go
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main.go
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// seehuhn.de/go/pdf - a library for reading and writing PDF files
// Copyright (C) 2021 Jochen Voss <voss@seehuhn.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"fmt"
"log"
"os"
"unicode"
"seehuhn.de/go/pdf"
"seehuhn.de/go/pdf/document"
"seehuhn.de/go/pdf/font"
"seehuhn.de/go/pdf/font/embed"
"seehuhn.de/go/pdf/font/type1"
"seehuhn.de/go/pdf/graphics/color"
"seehuhn.de/go/sfnt"
"seehuhn.de/go/sfnt/glyph"
)
func main() {
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, "usage: sfnt-glyph-table (font.ttf|font.otf)")
os.Exit(1)
}
fontFileName := os.Args[1]
tt, err := sfnt.ReadFile(fontFileName)
if err != nil {
log.Fatal(err)
}
cmap, _ := tt.CMapTable.GetBest()
rev := make(map[glyph.ID]rune)
if cmap != nil {
min, max := cmap.CodeRange()
for r := min; r <= max; r++ {
gid := cmap.Lookup(r)
if gid == 0 {
continue
}
r2 := rev[gid]
if r2 == 0 || r < r2 {
rev[gid] = r
}
}
}
paper := document.A4
doc, err := document.CreateMultiPage("test.pdf", paper, pdf.V1_7, nil)
if err != nil {
log.Fatal(err)
}
helvetica, err := type1.Helvetica.Embed(doc.Out, &font.Options{ResName: "R"})
if err != nil {
log.Fatal(err)
}
italic, err := type1.TimesItalic.Embed(doc.Out, &font.Options{ResName: "I"})
if err != nil {
log.Fatal(err)
}
courier, err := type1.Courier.Embed(doc.Out, &font.Options{ResName: "T"})
if err != nil {
log.Fatal(err)
}
opt := &font.Options{
Composite: true,
ResName: "X",
}
theFont, err := embed.OpenTypeFont(doc.Out, tt, opt)
if err != nil {
log.Fatal(err)
}
const margin = 36
f := &fontTables{
doc: doc,
textWidth: paper.URx - 2*margin,
textHeight: paper.URy - 2*margin,
margin: margin,
bodyFont: helvetica,
italicFont: italic,
monoFont: courier,
rev: rev,
}
err = f.WriteHeader(tt.FullName(), fontFileName)
if err != nil {
log.Fatal(err)
}
geom := theFont.GetGeometry()
numGlyphs := len(geom.Widths)
for i := 0; i < numGlyphs; i += 10 {
err = f.WriteGlyphRow(theFont, i)
if err != nil {
log.Fatal(err)
}
}
err = f.ClosePage()
if err != nil {
log.Fatal(err)
}
err = doc.Close()
if err != nil {
log.Fatal(err)
}
}
type fontTables struct {
doc *document.MultiPage
textWidth float64
textHeight float64
margin float64
bodyFont font.Layouter
italicFont font.Layouter
monoFont font.Layouter
page *document.Page
pageNo int
used float64 // vertical amount of page space currently used
rev map[glyph.ID]rune
}
func (f *fontTables) ClosePage() error {
if f.page == nil {
return nil
}
f.pageNo++
f.page.TextStart()
f.page.TextSetFont(f.bodyFont, 10)
f.page.TextFirstLine(f.margin+0.5*f.textWidth, f.margin-20)
f.page.TextShowAligned(fmt.Sprintf("- %d -", f.pageNo), 0, 0.5)
f.page.TextEnd()
err := f.page.Close()
f.page = nil
return err
}
func (f *fontTables) MakeSpace(vSpace float64) error {
if f.page != nil && f.used+vSpace < f.textHeight {
// If we have enough space, just return ...
return nil
}
// ... otherwise start a new page.
err := f.ClosePage()
if err != nil {
return err
}
f.page = f.doc.AddPage()
f.used = 0
return nil
}
func (f *fontTables) WriteHeader(title, fileName string) error {
gBody := f.bodyFont.GetGeometry()
gMono := f.monoFont.GetGeometry()
v1 := 12 * gBody.Ascent
v2 := 12*(gBody.BaseLineDistance-gBody.Ascent) + 10*gMono.Ascent
v3 := 10*(gMono.BaseLineDistance-gMono.Ascent) + 12
total := v1 + v2 + v3
err := f.MakeSpace(total)
if err != nil {
return err
}
f.page.TextStart()
f.page.TextSetFont(f.bodyFont, 12)
f.page.TextFirstLine(f.margin, f.margin+f.textHeight-f.used-v1)
f.page.TextShow(title)
f.page.TextSetFont(f.monoFont, 10)
f.page.TextSecondLine(0, -v2)
f.page.TextShow(fileName)
f.page.TextEnd()
f.used += total
return nil
}
func (f *fontTables) WriteGlyphRow(theFont font.Layouter, start int) error {
const glyphSize = 24
geom := theFont.GetGeometry()
gid := make([]glyph.ID, 0, 10)
for i := start; i < start+10; i++ {
if i >= len(geom.Widths) {
break
}
gid = append(gid, glyph.ID(i))
}
v1 := glyphSize * geom.Ascent
v2 := -glyphSize * geom.Descent
v3 := 12.0
total := v1 + v2 + v3
err := f.MakeSpace(total)
if err != nil {
return err
}
page := f.page
yBase := f.margin + f.textHeight - f.used - v1
left := f.margin + 72
right := f.margin + f.textWidth
dx := (right - left) / 10
// row label on the left
page.TextStart()
page.TextFirstLine(left-24, yBase)
page.TextSetFont(f.bodyFont, 10)
var label string
if start > 0 {
label = fmt.Sprintf("%d", start/10)
}
page.TextShowAligned(label, 0, 1)
page.TextSetFont(f.italicFont, 10)
page.TextShow("x")
page.TextEnd()
// grid of boxes
page.PushGraphicsState()
page.SetStrokeColor(color.DeviceRGB.New(.3, .3, 1))
page.SetLineWidth(.5)
page.MoveTo(left, yBase+v1)
page.LineTo(right, yBase+v1)
page.MoveTo(left, yBase)
page.LineTo(right, yBase)
page.MoveTo(left, yBase-v2)
page.LineTo(right, yBase-v2)
for i := 0; i <= 10; i++ {
x := left + float64(i)*dx
page.MoveTo(x, yBase+v1)
page.LineTo(x, yBase-v2)
}
page.Stroke()
xPos := make([]float64, len(gid))
page.SetStrokeColor(color.DeviceRGB.New(1, 0, 0))
for i, gid := range gid {
w := glyphSize * geom.Widths[gid]
xPos[i] = left + (float64(i)+0.5)*dx - 0.5*w
page.MoveTo(xPos[i], yBase+v1)
page.LineTo(xPos[i], yBase-v2)
page.MoveTo(xPos[i]+w, yBase+v1)
page.LineTo(xPos[i]+w, yBase-v2)
}
page.Stroke()
page.PopGraphicsState()
// boxes for glyph extent
page.PushGraphicsState()
page.SetFillColor(color.DeviceRGB.New(.4, 1, .4))
for i, gid := range gid {
ext := geom.GlyphExtents[gid]
page.Rectangle(
xPos[i]+glyphSize*ext.LLx,
yBase+glyphSize*ext.LLy,
glyphSize*(ext.URx-ext.LLx),
glyphSize*(ext.URy-ext.LLy))
}
page.Fill()
page.PopGraphicsState()
// draw the glyphs and labels
for i, gid := range gid {
g := font.Glyph{
GID: gid,
Advance: glyphSize * geom.Widths[gid],
}
r := f.rev[gid]
var label string
if r > 0 {
if r, ok := f.rev[gid]; ok {
g.Text = []rune{r}
// TODO(voss): fix this
// Try to establish a mapping from glyph ID to rune in the embedded
// font (called for side effects only).
theFont.CodeAndWidth(nil, gid, []rune{r})
}
if unicode.IsPrint(r) && r < 128 {
label = fmt.Sprintf("%q", r)
} else {
label = fmt.Sprintf("U+%04X", r)
}
}
gg := &font.GlyphSeq{Seq: []font.Glyph{g}}
page.TextStart()
page.TextSetFont(theFont, glyphSize)
page.TextFirstLine(xPos[i], yBase)
page.TextShowGlyphs(gg)
page.TextSetFont(f.bodyFont, 8)
page.TextFirstLine(left+float64(i)*dx-xPos[i], -v2-7.5)
page.TextShowAligned(label, dx, 0.5)
page.TextEnd()
}
f.used += total
return nil
}