func (stash *Stash) AddFontFromMemory(buffer []byte) (int, error) {
fnt := &Font{}
// Init hash lookup.
for i := 0; i < int(HASH_LUT_SIZE); i++ {
fnt.lut[i] = -1
}
fnt.data = buffer
// Init truetype
var err error
fnt.font, err = truetype.InitFont(fnt.data, 0)
if err != nil {
return 0, err
}
// Store normalized line height. The real line height is calculated
// by multiplying the lineh by font size.
ascent, descent, lineGap := fnt.font.GetFontVMetrics()
fh := float64(ascent - descent)
fnt.ascender = float64(ascent) / fh
fnt.descender = float64(descent) / fh
fnt.lineh = (fh + float64(lineGap)) / fh
fnt.idx = idx
fnt.fType = TTFONT_MEM
stash.fonts = append([]*Font{fnt}, stash.fonts...)
idx++
return idx - 1, nil
}
func main() {
data, err := ioutil.ReadFile(filepath.Join("..", "ClearSans-Regular.ttf"))
if err != nil {
panic(err)
}
font, err := truetype.InitFont(data, truetype.GetFontOffsetForIndex(data, 0))
if err != nil {
panic(err)
}
var c int
if len(os.Args) > 1 {
c = int(os.Args[1][0])
} else {
c = int('a')
}
bitmap, w, h := font.GetCodepointBitmap(0, font.ScaleForPixelHeight(20), c, 0, 0)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
fmt.Printf("%s", string(" .:ioVM@"[bitmap[j*w+i]>>5]))
}
fmt.Printf("\n")
}
}
func main() {
data, err := ioutil.ReadFile(filepath.Join("..", "ClearSans-Regular.ttf"))
if err != nil {
panic(err)
}
font, err := truetype.InitFont(data, truetype.GetFontOffsetForIndex(data, 0))
if err != nil {
panic(err)
}
bW := 512 // bitmap width
bH := 128 // bitmap height
lH := 64 // line height
scale := font.ScaleForPixelHeight(float64(lH))
word := "how are you?"
ascent, descent, _ := font.GetFontVMetrics()
ascent = int(float64(ascent) * scale)
descent = int(float64(descent) * scale)
bitmap := make([]byte, bW*bH)
x := 0
for i, b := range word {
cX1, cY1, cX2, cY2 := font.GetCodepointBitmapBox(int(b), scale, scale)
y := ascent + cY1
byteOffset := x + (y * bW)
tmp := font.MakeCodepointBitmap(bitmap[byteOffset:], cX2-cX1, cY2-cY1, bW, scale, scale, int(b))
copy(bitmap[byteOffset:], tmp)
ax, _ := font.GetCodepointHMetrics(int(b))
x += int(float64(ax) * scale)
if len(word) > i+1 {
kern := font.GetCodepointKernAdvance(int(b), int(word[i+1]))
x += int(float64(kern) * scale)
}
}
r := image.Rect(0, 0, bW, bH)
g := image.NewGray(r)
g.Pix = []uint8(bitmap)
file, err := os.Create("test.png")
if err != nil {
panic(err)
}
png.Encode(file, g)
}
func main() {
data, err := ioutil.ReadFile(filepath.Join("..", "ClearSans-Regular.ttf"))
if err != nil {
panic(err)
}
font, err := truetype.InitFont(data, truetype.GetFontOffsetForIndex(data, 0))
if err != nil {
panic(err)
}
text := "Heljo World!"
scale := font.ScaleForPixelHeight(15)
ascent, _, _ := font.GetFontVMetrics()
baseline := int(float64(ascent) * scale)
var screen [1580]byte
var xpos float64
for ch, b := range text {
xShift := xpos - math.Floor(xpos)
advance, _ := font.GetCodepointHMetrics(int(b))
x0, y0, x1, y1 := font.GetCodepointBitmapBoxSubpixel(int(b), scale, scale, xShift, 0)
tmp := font.MakeCodepointBitmapSubpixel(screen[(baseline+y0)*79+int(xpos)+x0:], x1-x0, y1-y0, 79, scale, scale, xShift, 0, int(b))
copy(screen[(baseline+y0)*79+int(xpos)+x0:], tmp)
xpos += (float64(advance) * scale)
if len(text) > ch+1 {
xpos += scale * float64(font.GetCodepointKernAdvance(int(b), int(text[ch+1])))
}
}
for j := 0; j < 20; j++ {
for i := 0; i < 78; i++ {
fmt.Printf("%s", string(" .:ioVM@"[screen[j*79+i]>>5]))
}
fmt.Printf("\n")
}
}
