minor fixes to prevent crashing on linux and eliminate error msgs about kern tables

freetype.go

@@ -6,15 +6,15 @@
 // The freetype package provides a convenient API to draw text onto an image.
 // Use the freetype/raster and freetype/truetype packages for lower level
 // control over rasterization and TrueType parsing.
-package freetype // import "github.com/golang/freetype"
+package freetype
 
 import (
 	"errors"
 	"image"
 	"image/draw"
 
-	"github.com/golang/freetype/raster"
-	"github.com/golang/freetype/truetype"
+	"github.com/goki/freetype/raster"
+	"github.com/goki/freetype/truetype"
 	"golang.org/x/image/font"
 	"golang.org/x/image/math/fixed"
 )

raster/raster.go

@@ -13,7 +13,7 @@
 // the Freetype "smooth" module, and the Anti-Grain Geometry library. A
 // description of the area/coverage algorithm is at
 // http://projects.tuxee.net/cl-vectors/section-the-cl-aa-algorithm
-package raster // import "github.com/golang/freetype/raster"
+package raster
 
 import (
 	"strconv"

truetype/face.go

@@ -9,7 +9,7 @@ import (
 	"image"
 	"math"
 
-	"github.com/golang/freetype/raster"
+	"github.com/goki/freetype/raster"
 	"golang.org/x/image/font"
 	"golang.org/x/image/math/fixed"
 )

truetype/glyph.go

@@ -175,6 +175,9 @@ func (g *GlyphBuf) load(recursion uint32, i Index, useMyMetrics bool) (err error
 	if recursion >= 32 {
 		return UnsupportedError("excessive compound glyph recursion")
 	}
+	if g.font.loca == nil {
+		return UnsupportedError("no glyph location data")
+	}
 	// Find the relevant slice of g.font.glyf.
 	var g0, g1 uint32
 	if g.font.locaOffsetFormat == locaOffsetFormatShort {

truetype/truetype.go

@@ -15,7 +15,7 @@
 //
 // To measure a TrueType font in ideal FUnit space, use scale equal to
 // font.FUnitsPerEm().
-package truetype // import "github.com/golang/freetype/truetype"
+package truetype
 
 import (
 	"fmt"
@@ -312,9 +312,10 @@ func (f *Font) parseKern() error {
 	// Since we expect that almost all fonts aim to be Windows-compatible, we only parse the "older" format,
 	// just like the C Freetype implementation.
 	if len(f.kern) == 0 {
-		if f.nKern != 0 {
-			return FormatError("bad kern table length")
-		}
+		// if f.nKern != 0 {
+		// 	return FormatError("bad kern table length")
+		// }
+		f.nKern = 0 // just reset and move on
 		return nil
 	}
 	if len(f.kern) < 18 {
@@ -346,7 +347,9 @@ func (f *Font) parseKern() error {
 	}
 	f.nKern, offset = int(u16(f.kern, offset)), offset+2
 	if 6*f.nKern != length-14 {
-		return FormatError("bad kern table length")
+		f.nKern = 0
+		return nil
+		// return FormatError("bad kern table length")
 	}
 	return nil
 }