func loadFont(path string) (*truetype.Font, error) {
file, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return truetype.Parse(file)
}
func main() {
flag.Parse()
fmt.Printf("Loading fontfile %q\n", *fontfile)
b, err := ioutil.ReadFile(*fontfile)
if err != nil {
log.Println(err)
return
}
font, err := truetype.Parse(b)
if err != nil {
log.Println(err)
return
}
fupe := font.FUnitsPerEm()
printBounds(font.Bounds(fupe))
fmt.Printf("FUnitsPerEm:%d\n\n", fupe)
c0, c1 := 'A', 'V'
i0 := font.Index(c0)
hm := font.HMetric(fupe, i0)
g := truetype.NewGlyphBuf()
err = g.Load(font, fupe, i0, nil)
if err != nil {
log.Println(err)
return
}
fmt.Printf("'%c' glyph\n", c0)
fmt.Printf("AdvanceWidth:%d LeftSideBearing:%d\n", hm.AdvanceWidth, hm.LeftSideBearing)
printGlyph(g)
i1 := font.Index(c1)
fmt.Printf("\n'%c', '%c' Kerning:%d\n", c0, c1, font.Kerning(fupe, i0, i1))
}
func getFont(path string, sizePts int) font {
sizePx := int(float64(sizePts)/ptInch*pxInch + 0.5)
if f, ok := fonts[path]; ok {
f.size = sizePx
return f
}
in, err := os.Open(path)
if err != nil {
panic(err)
}
defer in.Close()
fdata, err := ioutil.ReadAll(in)
if err != nil {
panic(err)
}
f := font{
path: path,
Context: freetype.NewContext(),
}
if f.Font, err = truetype.Parse(fdata); err != nil {
panic(err)
}
f.SetFont(f.Font)
f.SetDPI(pxInch)
fonts[path] = f
f.size = sizePx
return f
}
/*
生成验证码
bg:背景色
fg:前景色
length:字符长度
width:宽度
height:高度
size:字体大小
fontPath:字体文件路径
*/
func GenerateCaptcha(bg, fg *image.Uniform, length int, width int, height int, size float64, fontPath string) *Captcha {
fontBytes, err := ioutil.ReadFile(fontPath)
if err != nil {
panic(err)
}
font, err := truetype.Parse(fontBytes)
if err != nil {
panic(err)
}
cap := &Captcha{}
cap.Text = randString(length)
cap.Image = image.NewRGBA(image.Rect(0, 0, width, height))
draw.Draw(cap.Image, cap.Image.Bounds(), bg, image.ZP, draw.Src)
c := freetype.NewContext()
c.SetFont(font)
c.SetFontSize(size)
c.SetClip(cap.Image.Bounds())
c.SetDst(cap.Image)
c.SetSrc(fg)
pt := freetype.Pt(0, int(c.PointToFix32(size)>>8))
for _, s := range cap.Text {
_, err = c.DrawString(string(s), pt)
if err != nil {
panic(err)
return nil
}
pt.X += c.PointToFix32(size * 0.5)
}
return cap
}
// LoadFont loads the given truetype font file data and returns a new
// *TruetypeFont. For easier loading, consider using LoadTTFFile instead. This
// method is simply short-hand for:
// tt, err := truetype.Parse(data)
// if err != nil {
// return nil, err
// }
// return &TruetypeFont{
// Font: tt,
// }
func LoadFont(data []byte) (*TruetypeFont, error) {
f, err := truetype.Parse(data)
if err != nil {
return nil, err
}
return &TruetypeFont{
Font: f,
}, nil
}
func init() {
font, err := truetype.Parse(luxisr_ttf())
if err != nil {
// TODO: log error
println("error!")
println(err.Error())
}
draw2d.RegisterFont(DefaultFontData, font)
}
func LoadFont(path string) (*truetype.Font, error) {
bs, err := ioutil.ReadFile(path)
// quick debug
if err != nil {
fmt.Println(err)
}
f, err := truetype.Parse(bs)
return f, err
}
func loadFont(fontFileName string) *truetype.Font {
fontBytes, err := ioutil.ReadFile(path.Join(fontFolder, fontFileName))
if err != nil {
log.Println(err)
return nil
}
font, err := truetype.Parse(fontBytes)
if err != nil {
log.Println(err)
return nil
}
return font
}
//AddFont will add a new font file to the list
func (fm *FontManager) AddFont(pathToFontFile string) error {
fontBytes, err := ioutil.ReadFile(pathToFontFile)
if err != nil {
return err
}
font, err := truetype.Parse(fontBytes)
if err != nil {
return err
}
fm.fontFiles = append(fm.fontFiles, pathToFontFile)
fm.fontObjects[pathToFontFile] = font
return nil
}
func loadFont() (*truetype.Font, error) {
f, err := os.Open(filepath.Join(datadir, "fonts", "luxisr.ttf"))
if err != nil {
return nil, err
}
data, err := ioutil.ReadAll(f)
f.Close()
if err != nil {
return nil, err
}
font, err := truetype.Parse(data)
if err != nil {
return nil, err
}
return font, nil
}
func defaultFont() *truetype.Font {
goroot := os.Getenv("GOROOT")
if goroot == "" {
log.Fatal("no goroot set")
}
path := goroot + "/src/pkg/freetype-go.googlecode.com/hg/luxi-fonts/luxisr.ttf"
// Read the font data.
fontBytes, err := ioutil.ReadFile(path)
if err != nil {
log.Fatal(err)
}
font, err := truetype.Parse(fontBytes)
if err != nil {
log.Fatal(err)
}
return font
}
func analyzeFont(ttfFile string) SortedGS {
defer trackTime(time.Now(), "analyze_font")
f, err := ioutil.ReadFile(ttfFile)
if err != nil {
log.Fatal(err)
}
font, err := truetype.Parse(f)
if err != nil {
log.Fatal(err)
}
a := make(SortedGS, len(*alphabet))
for i, char := range *alphabet {
rgba := getRGBA(string(char), font)
nbp := getNumBlackPixels(rgba)
a[i] = &Artifact{string(char), nbp, nbp}
}
a.Normalize()
sort.Sort(a)
a = removeDuplicates(a)
//saveCharacterMap(a)
return a
}
func testFontFile(fontfile string) (*truetype.Font, error) {
fontfile = LocateFont(fontfile)
fmt.Printf("Testing fontfile %q\n", fontfile)
b, err := ioutil.ReadFile(fontfile)
if err != nil {
return nil, err
}
font, err := truetype.Parse(b)
if err != nil {
return nil, err
}
fupe := font.FUnitsPerEm()
printBounds(font.Bounds(font.FUnitsPerEm()))
fmt.Printf("FUnitsPerEm:%d\n\n", fupe)
// printGlyph(font, 'A', fupe)
printGlyph(font, 'V', fupe)
// printGlyph(font, 'a', fupe)
// printGlyph(font, 'v', fupe)
return font, nil
}
func newFont(data []byte, size int) (*font, error) {
ttf, err := truetype.Parse(data)
if err != nil {
return nil, err
}
scale := int32(size << 6)
bounds := ttf.Bounds(scale)
glyphMaxSizeDips := math.Size{
W: int(bounds.XMax-bounds.XMin) >> 6,
H: int(bounds.YMax-bounds.YMin) >> 6,
}
ascentDips := int(bounds.YMax >> 6)
return &font{
size: size,
scale: scale,
glyphMaxSizeDips: glyphMaxSizeDips,
ascentDips: ascentDips,
ttf: ttf,
resolutions: make(map[resolution]*glyphTable),
glyphs: make(map[rune]*glyph),
}, nil
}
// ParseFont just calls the Parse function from the freetype/truetype package.
// It is provided here so that code that imports this package doesn't need
// to also include the freetype/truetype package.
func ParseFont(b []byte) (*truetype.Font, error) {
return truetype.Parse(b)
}
func main() {
b, _ := ioutil.ReadFile("./roboto/roboto-light.ttf")
font, ferr := tt.Parse(b)
if ferr != nil {
fmt.Println("can't parse font %v , len %v", ferr.Error(), len(b))
}
fc := ft.NewContext()
fc.SetFont(font)
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(800, 600, "Testing", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
gl.Init()
program := gl.CreateProgram()
vertexShader := gl.CreateShader(gl.VERTEX_SHADER)
vertexShader.Source(`
attribute vec4 a_position;
attribute vec2 a_coord;
varying vec2 v_coord;
void main() {
gl_Position = a_position;
v_coord = a_coord;
}
`)
vertexShader.Compile()
fmt.Printf("vertex: %v\n", vertexShader.GetInfoLog())
fragmentShader := gl.CreateShader(gl.FRAGMENT_SHADER)
fragmentShader.Source(`
varying vec2 v_coord;
uniform sampler2D s_picture;
uniform vec4 color;
uniform bool has_picture;
void main() {
if(has_picture) {
gl_FragColor = texture2D(s_picture, v_coord);
} else {
gl_FragColor = color;
}
}
`)
fragmentShader.Compile()
fmt.Printf("fragment %v \n", fragmentShader.GetInfoLog())
program.AttachShader(vertexShader)
program.AttachShader(fragmentShader)
program.Link()
// ini
//gl.MatrixMode(gl.PROJECTION)
//gl.Ortho(0, 640, 0, 480, 0, 1)
gl.ClearColor(0.5, 0.5, 0.5, 0.0)
root := widget.Widget{
Name: "Red",
Rect: image.Rect(0, 0, 800, 600),
Background: color.RGBA{255, 128, 128, 126},
OnClick: widget.ClickInner,
OnDrag: widget.DragInner,
OnHover: widget.HoverInner,
OnResize: widget.ResizeItself,
}
blue := root.AddWidget(&widget.Widget{
Name: "Blue",
Rect: image.Rect(100, 100, 200, 200),
Image: LoadImage("./test.png"),
Background: color.RGBA{128, 128, 255, 126},
OnClick: func(w *widget.Widget, p image.Point) {
root.SetTop(w)
fmt.Println("Clicked blue box")
widget.ClickInner(w, p)
},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragInner(w, p, d)
widget.DragItself(w, p, d)
return true
},
OnResize: widget.ResizeItself,
})
blue.AddWidget(&widget.Widget{
Name: "White",
Rect: image.Rect(90, 90, 100, 100),
Background: color.RGBA{250, 250, 250, 250},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragItself(w, p, d)
blue.Resize(d)
return true
},
})
root.AddWidget(&widget.Widget{
Name: "Green",
Rect: image.Rect(100, 300, 200, 400),
Background: color.RGBA{128, 255, 128, 126},
OnClick: func(w *widget.Widget, p image.Point) {
root.SetTop(w)
w.Image = LoadImage("./test2.png")
},
OnDrag: widget.DragItself,
})
root.AddWidget(&widget.Widget{
Name: "Black",
Rect: image.Rect(100, 400, 150, 450),
Background: color.RGBA{0, 0, 0, 126},
OnHover: func(w *widget.Widget, p0 image.Point, p1 image.Point) {
if p1.In(w.Rect) {
w.Background = color.RGBA{255, 255, 255, 126}
} else {
w.Background = color.RGBA{0, 0, 0, 126}
}
},
})
white := root.AddWidget(&widget.Widget{
Name: "White",
Text: "Меня зовут Светлана, я из города Иваново. «Единая Россия» очень много сделала достижений: они подняли экономик… экономику, мы стали более лучшие… одеваться, и не было того что щас — это очень большие достижения! В сельском хозяйстве очень хорошо. (Гладин: Что именно в сельском хозяйстве они сделали?) Стало больше… земель за-а… много, ну… я не знаю даже как сказать… засеивать больше земель… а-а-а вот, овощи там, рожь — вот это всё. Что еще сказать… Так как у нас страна многонациональная, у нас в Москве очень много людей, которые очень помогают нам… с других городов… (вопрос Гладина: Вы считаете это достижение «Единой России»?) Да, это большое достижение! Очень хорошее даже! Видите ну… да… Видите ну у нас в Иванове очень хорошая стала медицина… а…что ещё… благоустройство в городах хорошее… с жильём… никаких проблем. Люди подмогают очень хорошо",
Rect: image.Rect(400, 200, 700, 500),
Foreground: color.RGBA{0, 0, 0, 0},
Background: color.RGBA{255, 255, 255, 126},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
root.SetTop(w)
widget.DragInner(w, p, d)
widget.DragItself(w, p, d)
return true
},
OnResize: widget.ResizeItself,
Padding: image.Rect(20, 20, 20, 20),
})
white.AddWidget(&widget.Widget{
Name: "White",
Rect: image.Rect(290, 290, 300, 300),
Background: color.RGBA{0, 0, 0, 250},
OnDrag: func(w *widget.Widget, p image.Point, d image.Point) bool {
widget.DragItself(w, p, d)
white.Resize(d)
return true
},
})
x0 := 0.0
y0 := 0.0
window.SetMouseButtonCallback(func(w *glfw.Window, but glfw.MouseButton, act glfw.Action, key glfw.ModifierKey) {
xpos, ypos := w.GetCursorPosition()
if act == glfw.Press {
root.Click(image.Point{X: int(xpos), Y: int(ypos)})
x0, y0 = xpos, ypos
}
})
window.SetCursorPositionCallback(func(w *glfw.Window, xpos float64, ypos float64) {
root.Hover(image.Point{X: int(x0), Y: int(y0)}, image.Point{X: int(xpos), Y: int(ypos)})
if w.GetMouseButton(glfw.MouseButtonLeft) == glfw.Press {
root.Drag(image.Point{X: int(x0), Y: int(y0)}, image.Point{X: int(xpos - x0), Y: int(ypos - y0)})
x0, y0 = xpos, ypos
}
x0, y0 = xpos, ypos
})
width0, height0 := window.GetSize()
window.SetSizeCallback(func(w *glfw.Window, width int, height int) {
gl.Viewport(0, 0, width, height)
root.Rect.Max = image.Point{width, height}
width0, height0 = width, height
})
/*switch(color_type){
case PNG_COLOR_TYPE_GRAY:
return GL_LUMINANCE;
case PNG_COLOR_TYPE_GRAY_ALPHA:
return GL_LUMINANCE_ALPHA;
case PNG_COLOR_TYPE_RGB:
return GL_RGB;
case PNG_COLOR_TYPE_RGB_ALPHA:
return GL_RGBA;
*/
/*
here init texture pool
texturePool := make([widget.Widget]texture)
*/
for !window.ShouldClose() {
//Do OpenGL stuff
program.Use()
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
root.DrawBy(image.Point{}, func(w *widget.Widget, corner image.Point) {
var texture gl.Texture
if w.Image != nil {
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.ActiveTexture(gl.TEXTURE0)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
w.Image.Rect.Dx(), w.Image.Rect.Dy(),
0, gl.RGBA, gl.UNSIGNED_BYTE, w.Image.Pix)
}
leftX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
leftY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
rightX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
rightY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
bottomX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
bottomY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
topX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
topY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
vertices := []float32{
leftX, leftY,
rightX, rightY,
bottomX, bottomY,
topX, topY,
}
texturePoints := []float32{
0.0, 0.0, 0.0, 1.0,
1.0, 0.0, 1.0, 1.0,
}
s_picture := program.GetUniformLocation("s_picture")
s_picture.Uniform1i(0)
has_picture := program.GetUniformLocation("has_picture")
if w.Image != nil {
has_picture.Uniform1i(1)
} else {
has_picture.Uniform1i(0)
}
col := program.GetUniformLocation("color")
r, g, b, a := w.Background.RGBA()
col.Uniform4f(float32(r)/float32(0xFFFF), float32(g)/float32(0xFFFF), float32(b)/float32(0xFFFF), float32(a)/float32(0xFFFF))
gl.PixelStorei(gl.UNPACK_ALIGNMENT, gl.UNSIGNED_BYTE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
a_position := program.GetAttribLocation("a_position")
a_position.AttribPointer(2, gl.FLOAT, false, 0, vertices)
a_position.EnableArray()
a_coord := program.GetAttribLocation("a_coord")
a_coord.AttribPointer(2, gl.FLOAT, false, 0, texturePoints)
a_coord.EnableArray()
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.Flush()
texture.Delete()
if len(w.Text) > 0 {
rct := w.Rect
rct.Max = rct.Max.Sub(w.Rect.Min)
rct.Min = rct.Min.Sub(w.Rect.Min)
fg := image.NewRGBA(rct)
fgu := image.NewUniform(color.RGBA{0, 16, 32, 255})
draw.Draw(fg, fg.Bounds(), fgu, image.ZP, draw.Src)
bg := image.NewRGBA(rct)
bgu := image.NewUniform(color.RGBA{255, 255, 255, 255})
draw.Draw(bg, bg.Bounds(), bgu, image.ZP, draw.Src)
lineHeight := 20.0
fc.SetDPI(100.0)
fc.SetFont(font)
fc.SetFontSize(12.0)
fc.SetClip(bg.Bounds())
fc.SetDst(bg)
fc.SetSrc(fg)
p0 := ft.Pt(w.Padding.Min.X, w.Padding.Min.Y)
p := p0
for _, s := range w.Text {
p, _ = fc.DrawString(string(s), p)
if int(p.X>>8) > rct.Max.X-w.Padding.Max.X-w.Padding.Min.X {
p.X = p0.X
p.Y += raster.Fix32(lineHeight * 256)
}
}
var texture gl.Texture
if bg != nil {
texture = gl.GenTexture()
texture.Bind(gl.TEXTURE_2D)
gl.ActiveTexture(gl.TEXTURE0)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
bg.Rect.Dx(), bg.Rect.Dy(),
0, gl.RGBA, gl.UNSIGNED_BYTE, bg.Pix)
}
leftX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
leftY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
rightX := 2.0*float32(corner.X+w.Rect.Min.X)/float32(root.Rect.Dx()) - 1.0
rightY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
bottomX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
bottomY := 1.0 - 2.0*float32(corner.Y+w.Rect.Min.Y)/float32(root.Rect.Dy())
topX := 2.0*float32(corner.X+w.Rect.Max.X)/float32(root.Rect.Dx()) - 1.0
topY := 1.0 - 2.0*float32(corner.Y+w.Rect.Max.Y)/float32(root.Rect.Dy())
vertices := []float32{
leftX, leftY,
rightX, rightY,
bottomX, bottomY,
topX, topY,
}
texturePoints := []float32{
0.0, 0.0, 0.0, 1.0,
1.0, 0.0, 1.0, 1.0,
}
s_picture := program.GetUniformLocation("s_picture")
s_picture.Uniform1i(0)
has_picture := program.GetUniformLocation("has_picture")
if bg != nil {
has_picture.Uniform1i(1)
} else {
has_picture.Uniform1i(0)
}
col := program.GetUniformLocation("color")
r, g, b, a := w.Background.RGBA()
col.Uniform4f(float32(r)/float32(0xFFFF), float32(g)/float32(0xFFFF), float32(b)/float32(0xFFFF), float32(a)/float32(0xFFFF))
gl.PixelStorei(gl.UNPACK_ALIGNMENT, gl.UNSIGNED_BYTE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
a_position := program.GetAttribLocation("a_position")
a_position.AttribPointer(2, gl.FLOAT, false, 0, vertices)
a_position.EnableArray()
a_coord := program.GetAttribLocation("a_coord")
a_coord.AttribPointer(2, gl.FLOAT, false, 0, texturePoints)
a_coord.EnableArray()
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.Flush()
texture.Delete()
}
})
window.SwapBuffers()
glfw.PollEvents()
}
}
// LoadTruetype loads a truetype font from the given stream and
// applies the given font scale in points.
//
// The low and high values determine the lower and upper rune limits
// we should load for this font. For standard ASCII this would be: 32, 127.
func LoadTruetype(r io.Reader, scale int32, low, high rune) (*Font, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
// Read the truetype font.
ttf, err := truetype.Parse(data)
if err != nil {
return nil, err
}
// Create our FontConfig type.
var fc FontConfig
fc.Low = low
fc.High = high
fc.Glyphs = make(Charset, high-low+1)
// Create an image, large enough to store all requested glyphs.
//
// We limit the image to 16 glyphs per row. Then add as many rows as
// needed to encompass all glyphs, while making sure the resulting image
// has power-of-two dimensions.
gc := int32(len(fc.Glyphs))
glyphsPerRow := int32(16)
glyphsPerCol := (gc / glyphsPerRow) + 1
gb := ttf.Bounds(scale)
gw := (gb.XMax - gb.XMin)
// why?
gh := (gb.YMax - gb.YMin) + 5
iw := Pow2(uint32(gw * glyphsPerRow))
ih := Pow2(uint32(gh * glyphsPerCol))
fg, bg := image.White, image.Transparent
rect := image.Rect(0, 0, int(iw), int(ih))
img := image.NewRGBA(rect)
draw.Draw(img, img.Bounds(), bg, image.ZP, draw.Src)
// Use a freetype context to do the drawing.
c := freetype.NewContext()
c.SetDPI(72) // Do not change this. It is required in order to have a properly aligned bounding box!!!
c.SetFont(ttf)
c.SetFontSize(float64(scale))
c.SetClip(img.Bounds())
c.SetDst(img)
c.SetSrc(fg)
// Iterate over all relevant glyphs in the truetype font and
// draw them all to the image buffer.
//
// For each glyph, we also create a corresponding Glyph structure
// for our Charset. It contains the appropriate glyph coordinate offsets.
var gi int
var gx, gy int32
for ch := low; ch <= high; ch++ {
index := ttf.Index(ch)
metric := ttf.HMetric(scale, index)
fc.Glyphs[gi].Advance = int(metric.AdvanceWidth)
fc.Glyphs[gi].X = int(gx)
fc.Glyphs[gi].Y = int(gy)
fc.Glyphs[gi].Width = int(gw)
fc.Glyphs[gi].Height = int(gh)
pt := freetype.Pt(int(gx), int(gy)+int(c.PointToFix32(float64(scale))>>8))
c.DrawString(string(ch), pt)
if gi%16 == 0 {
gx = 0
gy += gh
} else {
gx += gw
}
gi++
}
return loadFont(img, &fc)
}
