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Add NewCompositePdfFontFromTTF to load composite TTF from memory

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This commit is contained in:
Gunnsteinn Hall 2020-04-18 10:37:10 +00:00
parent 11f3a6e7a2
commit d23d4b8c79
2 changed files with 16 additions and 3 deletions
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17
model/font_composite.go
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@ -9,6 +9,7 @@ import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"sort"
@ -569,17 +570,27 @@ func parseCIDFontWidthsArray(w core.PdfObject) (map[textencoding.CharCode]float6
// NewCompositePdfFontFromTTFFile loads a composite font from a TTF font file. Composite fonts can
// be used to represent unicode fonts which can have multi-byte character codes, representing a wide
// range of values.
// range of values. They are often used for symbolic languages, including Chinese, Japanese and Korean.
// It is represented by a Type0 Font with an underlying CIDFontType2 and an Identity-H encoding map.
// TODO: May be extended in the future to support a larger variety of CMaps and vertical fonts.
// NOTE: For simple fonts, use NewPdfFontFromTTFFile.
func NewCompositePdfFontFromTTFFile(filePath string) (*PdfFont, error) {
// Load the truetype font data.
ttfBytes, err := ioutil.ReadFile(filePath)
if err != nil {
common.Log.Debug("ERROR: while reading ttf font: %v", err)
return nil, err
}
ttf, err := fonts.TtfParse(bytes.NewReader(ttfBytes))
return NewCompositePdfFontFromTTF(bytes.NewReader(ttfBytes))
}
// NewCompositePdfFontFromTTF loads a composite TTF font. Composite fonts can
// be used to represent unicode fonts which can have multi-byte character codes, representing a wide
// range of values. They are often used for symbolic languages, including Chinese, Japanese and Korean.
// It is represented by a Type0 Font with an underlying CIDFontType2 and an Identity-H encoding map.
// TODO: May be extended in the future to support a larger variety of CMaps and vertical fonts.
// NOTE: For simple fonts, use NewPdfFontFromTTF.
func NewCompositePdfFontFromTTF(rs io.ReadSeeker) (*PdfFont, error) {
ttf, err := fonts.TtfParse(rs)
if err != nil {
common.Log.Debug("ERROR: while loading ttf font: %v", err)
return nil, err

2
model/font_simple.go
View File

@ -385,6 +385,7 @@ func (font *pdfFontSimple) ToPdfObject() core.PdfObject {
// NewPdfFontFromTTFFile loads a TTF font file and returns a PdfFont type
// that can be used in text styling functions.
// Uses a WinAnsiTextEncoder and loads only character codes 32-255.
// NOTE: For composite fonts such as used in symbolic languages, use NewCompositePdfFontFromTTFFile.
func NewPdfFontFromTTFFile(filePath string) (*PdfFont, error) {
f, err := os.Open(filePath)
if err != nil {
@ -399,6 +400,7 @@ func NewPdfFontFromTTFFile(filePath string) (*PdfFont, error) {
// NewPdfFontFromTTF loads a TTF font and returns a PdfFont type that can be
// used in text styling functions.
// Uses a WinAnsiTextEncoder and loads only character codes 32-255.
// NOTE: For composite fonts such as used in symbolic languages, use NewCompositePdfFontFromTTF.
func NewPdfFontFromTTF(r io.ReadSeeker) (*PdfFont, error) {
const minCode = textencoding.CharCode(32)
const maxCode = textencoding.CharCode(255)