155 lines
3.0 KiB
Go
155 lines
3.0 KiB
Go
package gg
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import (
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"fmt"
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"image"
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"image/draw"
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"image/jpeg"
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_ "image/jpeg"
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"image/png"
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"io/ioutil"
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"math"
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"os"
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"strings"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font"
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"golang.org/x/image/math/fixed"
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)
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func Radians(degrees float64) float64 {
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return degrees * math.Pi / 180
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}
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func Degrees(radians float64) float64 {
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return radians * 180 / math.Pi
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}
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func LoadImage(path string) (image.Image, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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im, _, err := image.Decode(file)
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return im, err
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}
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func LoadPNG(path string) (image.Image, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return png.Decode(file)
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}
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func SavePNG(path string, im image.Image) error {
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file, err := os.Create(path)
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if err != nil {
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return err
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}
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defer file.Close()
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return png.Encode(file, im)
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}
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func LoadJPG(path string) (image.Image, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return jpeg.Decode(file)
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}
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func SaveJPG(path string, im image.Image, quality int) error {
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file, err := os.Create(path)
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if err != nil {
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return err
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}
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defer file.Close()
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var opt jpeg.Options
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opt.Quality = quality
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return jpeg.Encode(file, im, &opt)
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}
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func imageToRGBA(src image.Image) *image.RGBA {
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bounds := src.Bounds()
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dst := image.NewRGBA(bounds)
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draw.Draw(dst, bounds, src, bounds.Min, draw.Src)
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return dst
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}
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func parseHexColor(x string) (r, g, b, a int) {
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x = strings.TrimPrefix(x, "#")
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a = 255
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if len(x) == 3 {
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format := "%1x%1x%1x"
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fmt.Sscanf(x, format, &r, &g, &b)
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r |= r << 4
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g |= g << 4
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b |= b << 4
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}
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if len(x) == 6 {
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format := "%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b)
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}
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if len(x) == 8 {
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format := "%02x%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b, &a)
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}
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return
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}
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func fixp(x, y float64) fixed.Point26_6 {
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return fixed.Point26_6{fix(x), fix(y)}
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}
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func fix(x float64) fixed.Int26_6 {
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return fixed.Int26_6(x * 64)
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}
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func unfix(x fixed.Int26_6) float64 {
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const shift, mask = 6, 1<<6 - 1
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if x >= 0 {
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return float64(x>>shift) + float64(x&mask)/64
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}
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x = -x
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if x >= 0 {
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return -(float64(x>>shift) + float64(x&mask)/64)
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}
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return 0
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}
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// LoadFontFace is a helper function to load the specified font file with
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// the specified point size. Note that the returned `font.Face` objects
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// are not thread safe and cannot be used in parallel across goroutines.
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// You can usually just use the Context.LoadFontFace function instead of
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// this package-level function.
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func LoadFontFace(path string, points float64) (font.Face, error) {
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fontBytes, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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face, err := LoadFontFaceFromBytes(fontBytes, points)
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if err != nil {
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return nil, err
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}
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return face, nil
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}
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func LoadFontFaceFromBytes(fontBytes []byte, points float64) (font.Face, error) {
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f, err := truetype.Parse(fontBytes)
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if err != nil {
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return nil, err
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}
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face := truetype.NewFace(f, &truetype.Options{
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Size: points,
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// Hinting: font.HintingFull,
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})
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return face, nil
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}
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