Include vendor dependencies

vendor/github.com/fogleman/gg/util.go

@@ -0,0 +1,117 @@
+package gg
+
+import (
+	"fmt"
+	"image"
+	"image/draw"
+	_ "image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"math"
+	"os"
+	"strings"
+
+	"github.com/golang/freetype/truetype"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func Radians(degrees float64) float64 {
+	return degrees * math.Pi / 180
+}
+
+func Degrees(radians float64) float64 {
+	return radians * 180 / math.Pi
+}
+
+func LoadImage(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	im, _, err := image.Decode(file)
+	return im, err
+}
+
+func LoadPNG(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return png.Decode(file)
+}
+
+func SavePNG(path string, im image.Image) error {
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return png.Encode(file, im)
+}
+
+func imageToRGBA(src image.Image) *image.RGBA {
+	dst := image.NewRGBA(src.Bounds())
+	draw.Draw(dst, dst.Rect, src, image.ZP, draw.Src)
+	return dst
+}
+
+func parseHexColor(x string) (r, g, b, a int) {
+	x = strings.TrimPrefix(x, "#")
+	a = 255
+	if len(x) == 3 {
+		format := "%1x%1x%1x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+		r |= r << 4
+		g |= g << 4
+		b |= b << 4
+	}
+	if len(x) == 6 {
+		format := "%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+	}
+	if len(x) == 8 {
+		format := "%02x%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b, &a)
+	}
+	return
+}
+
+func fixp(x, y float64) fixed.Point26_6 {
+	return fixed.Point26_6{fix(x), fix(y)}
+}
+
+func fix(x float64) fixed.Int26_6 {
+	return fixed.Int26_6(x * 64)
+}
+
+func unfix(x fixed.Int26_6) float64 {
+	const shift, mask = 6, 1<<6 - 1
+	if x >= 0 {
+		return float64(x>>shift) + float64(x&mask)/64
+	}
+	x = -x
+	if x >= 0 {
+		return -(float64(x>>shift) + float64(x&mask)/64)
+	}
+	return 0
+}
+
+func LoadFontFace(path string, points float64) (font.Face, error) {
+	fontBytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	f, err := truetype.Parse(fontBytes)
+	if err != nil {
+		return nil, err
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size: points,
+		// Hinting: font.HintingFull,
+	})
+	return face, nil
+}