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Add NewCompositePdfFontFromTTF to load composite TTF from memory #319

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Merged
merged 2 commits into from
Apr 18, 2020
Merged

Add NewCompositePdfFontFromTTF to load composite TTF from memory #319

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d23d4b8
Add NewCompositePdfFontFromTTF to load composite TTF from memory
gunnsth Apr 18, 2020
fa5f135
Fixes
gunnsth Apr 18, 2020
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27 changes: 23 additions & 4 deletions model/font_composite.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,9 @@ import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"sort"

"github.com/unidoc/unipdf/v3/common"
Expand Down Expand Up @@ -569,16 +571,33 @@ 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)
f, err := os.Open(filePath)
if err != nil {
common.Log.Debug("ERROR: while reading ttf font: %v", err)
common.Log.Debug("ERROR: opening file: %v", err)
return nil, err
}
defer f.Close()
return NewCompositePdfFontFromTTF(f)
}

// 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(r io.ReadSeeker) (*PdfFont, error) {
ttfBytes, err := ioutil.ReadAll(r)
if err != nil {
common.Log.Debug("ERROR: Unable to read font contents: %v", err)
return nil, err
}

ttf, err := fonts.TtfParse(bytes.NewReader(ttfBytes))
if err != nil {
common.Log.Debug("ERROR: while loading ttf font: %v", err)
Expand Down
2 changes: 2 additions & 0 deletions model/font_simple.go
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
Expand All @@ -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)
Expand Down