From 3b6661f37138ca3acd19fdf756b3104021d2b315 Mon Sep 17 00:00:00 2001
From: Paulo Coutinho <paulo@prsolucoes.com>
Date: Thu, 28 Jul 2016 15:16:40 -0300
Subject: adding support to embedded fonts as byte array

---
 def.go  | 23 +++++++++--------
 fpdf.go | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 100 insertions(+), 14 deletions(-)

diff --git a/def.go b/def.go
index f5eed3a..3bb32d4 100644
--- a/def.go
+++ b/def.go
@@ -122,6 +122,8 @@ func (info *ImageInfoType) SetDpi(dpi float64) {
 type fontFileType struct {
 	length1, length2 int64
 	n                int
+	embedded         bool
+	content          []byte
 }
 
 type linkType struct {
@@ -246,9 +248,10 @@ type Fpdf struct {
 	layer            layerRecType              // manages optional layers in document
 	catalogSort      bool                      // sort resource catalogs in document
 	colorFlag        bool                      // indicates whether fill and text colors are different
-	color            struct {                  // Composite values of colors
-		draw, fill, text clrType
-	}
+	color            struct {
+						 // Composite values of colors
+						 draw, fill, text clrType
+					 }
 }
 
 type encType struct {
@@ -310,31 +313,31 @@ type FontDescType struct {
 	// The maximum height above the baseline reached by glyphs in this
 	// font (for example for "S"). The height of glyphs for accented
 	// characters shall be excluded.
-	Ascent int
+	Ascent       int
 	// The maximum depth below the baseline reached by glyphs in this
 	// font. The value shall be a negative number.
-	Descent int
+	Descent      int
 	// The vertical coordinate of the top of flat capital letters,
 	// measured from the baseline (for example "H").
-	CapHeight int
+	CapHeight    int
 	// A collection of flags defining various characteristics of the
 	// font. (See the FontFlag* constants.)
-	Flags int
+	Flags        int
 	// A rectangle, expressed in the glyph coordinate system, that
 	// shall specify the font bounding box. This should be the smallest
 	// rectangle enclosing the shape that would result if all of the
 	// glyphs of the font were placed with their origins coincident
 	// and then filled.
-	FontBBox fontBoxType
+	FontBBox     fontBoxType
 	// The angle, expressed in degrees counterclockwise from the
 	// vertical, of the dominant vertical strokes of the font. (The
 	// 9-o’clock position is 90 degrees, and the 3-o’clock position
 	// is –90 degrees.) The value shall be negative for fonts that
 	// slope to the right, as almost all italic fonts do.
-	ItalicAngle int
+	ItalicAngle  int
 	// The thickness, measured horizontally, of the dominant vertical
 	// stems of glyphs in the font.
-	StemV int
+	StemV        int
 	// The width to use for character codes whose widths are not
 	// specified in a font dictionary’s Widths array. This shall have
 	// a predictable effect only if all such codes map to glyphs whose
diff --git a/fpdf.go b/fpdf.go
index 1ee5aaf..60846b0 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -1405,6 +1405,80 @@ func (f *Fpdf) AddFont(familyStr, styleStr, fileStr string) {
 	f.AddFontFromReader(familyStr, styleStr, file)
 }
 
+// AddFont imports a TrueType, OpenType or Type1 font and makes it available.
+//
+// You need use the content of files .json and .z of your font files as an
+// array of bytes.
+//
+// family specifies the font family. The name can be chosen arbitrarily. If it
+// is a standard family name, it will override the corresponding font. This
+// string is used to subsequently set the font with the SetFont method.
+//
+// style specifies the font style. Acceptable values are (case insensitive) the
+// empty string for regular style, "B" for bold, "I" for italic, or "BI" or
+// "IB" for bold and italic combined.
+//
+// jsonFileBytes contain all bytes of JSON file
+// zFileBytes contain all bytes of Z file
+func (f *Fpdf) AddFontFromBytes(familyStr string, styleStr string, jsonFileBytes []byte, zFileBytes []byte) {
+	if f.err != nil {
+		return
+	}
+
+	// load font key
+	var ok bool
+	fontkey := getFontKey(familyStr, styleStr)
+	_, ok = f.fonts[fontkey]
+
+	if ok {
+		return
+	}
+
+	// load font definitions
+	var info fontDefType
+	err := json.Unmarshal(jsonFileBytes, &info)
+
+	if err != nil {
+		f.err = err
+	}
+
+	if f.err != nil {
+		return
+	}
+
+	// search existing encodings
+	info.I = len(f.fonts)
+
+	if len(info.Diff) > 0 {
+		n := -1
+
+		for j, str := range f.diffs {
+			if str == info.Diff {
+				n = j + 1
+				break
+			}
+		}
+
+		if n < 0 {
+			f.diffs = append(f.diffs, info.Diff)
+			n = len(f.diffs)
+		}
+
+		info.DiffN = n
+	}
+
+	// embed font
+	if len(info.File) > 0 {
+		if info.Tp == "TrueType" {
+			f.fontFiles[info.File] = fontFileType{length1: int64(info.OriginalSize), embedded: true, content: zFileBytes}
+		} else {
+			f.fontFiles[info.File] = fontFileType{length1: int64(info.Size1), length2: int64(info.Size2), embedded: true, content: zFileBytes}
+		}
+	}
+
+	f.fonts[fontkey] = info
+}
+
 // getFontKey is used by AddFontFromReader and GetFontDesc
 func getFontKey(familyStr, styleStr string) string {
 	familyStr = strings.ToLower(familyStr)
@@ -3237,11 +3311,20 @@ func (f *Fpdf) putfonts() {
 			f.newobj()
 			info.n = f.n
 			f.fontFiles[file] = info
-			font, err := f.loadFontFile(file)
-			if err != nil {
-				f.err = err
-				return
+
+			var font []byte
+
+			if info.embedded {
+				font = info.content
+			} else {
+				var err error
+				font, err = f.loadFontFile(file)
+				if err != nil {
+					f.err = err
+					return
+				}
 			}
+
 			// dbg("font file [%s], ext [%s]", file, file[len(file)-2:])
 			compressed := file[len(file)-2:] == ".z"
 			if !compressed && info.length2 > 0 {
-- 
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