mirror of
https://github.com/Luzifer/streamdeck.git
synced 2024-12-20 09:41:19 +00:00
Extract text rendering to helper
Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
parent
fd6ac1e954
commit
9065b0ad0f
GPG key ID:
DC2729FDD34BE99E
2 changed files with 148 additions and 112 deletions
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@ -4,24 +4,17 @@ import (
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"bytes"
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"context"
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"encoding/json"
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"image"
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"image/color"
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"image/draw"
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_ "image/jpeg"
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_ "image/png"
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"io/ioutil"
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"os"
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"os/exec"
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"strings"
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"time"
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"github.com/Luzifer/go_helpers/v2/env"
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"github.com/golang/freetype"
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"github.com/golang/freetype/truetype"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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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 init() {
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@ -34,13 +27,10 @@ type displayElementExec struct {
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func (d displayElementExec) Display(ctx context.Context, idx int, attributes map[string]interface{}) error {
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var (
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err error
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img draw.Image = image.NewRGBA(image.Rect(0, 0, sd.IconSize(), sd.IconSize()))
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err error
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imgRenderer = newTextOnImageRenderer()
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)
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// Initialize black image
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draw.Draw(img, img.Bounds(), image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0xff}), image.ZP, draw.Src)
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// Initialize command
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cmd, ok := attributes["command"].([]interface{})
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if !ok {
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@ -98,14 +88,9 @@ func (d displayElementExec) Display(ctx context.Context, idx int, attributes map
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// Initialize background
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if filename, ok := attributes["image"].(string); ok {
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bgi, err := d.getImageFromDisk(filename)
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if err != nil {
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return errors.Wrap(err, "Unable to get image from disk")
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if err = imgRenderer.DrawBackgroundFromFile(filename); err != nil {
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return errors.Wrap(err, "Unable to draw background from disk")
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}
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bgi = autoSizeImage(bgi, sd.IconSize())
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draw.Draw(img, img.Bounds(), bgi, image.ZP, draw.Src)
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}
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// Initialize color
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@ -140,21 +125,8 @@ func (d displayElementExec) Display(ctx context.Context, idx int, attributes map
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border = v
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}
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// Render text
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f, err := d.loadFont()
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if err != nil {
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return errors.Wrap(err, "Unable to load font")
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}
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c := freetype.NewContext()
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c.SetClip(img.Bounds())
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c.SetDPI(72)
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c.SetDst(img)
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c.SetFont(f)
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c.SetHinting(font.HintingNone)
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if strings.TrimSpace(attributes["text"].(string)) != "" {
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if err = d.drawText(c, strings.TrimSpace(attributes["text"].(string)), textColor, fontsize, border); err != nil {
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if err = imgRenderer.DrawBigText(strings.TrimSpace(attributes["text"].(string)), fontsize, border, textColor); err != nil {
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return errors.Wrap(err, "Unable to render text")
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}
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}
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@ -168,7 +140,7 @@ func (d displayElementExec) Display(ctx context.Context, idx int, attributes map
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return err
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}
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return errors.Wrap(sd.FillImage(idx, img), "Unable to set image")
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return errors.Wrap(sd.FillImage(idx, imgRenderer.GetImage()), "Unable to set image")
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}
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func (d displayElementExec) NeedsLoop(attributes map[string]interface{}) bool {
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@ -206,81 +178,3 @@ func (d *displayElementExec) StopLoopDisplay() error {
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d.running = false
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return nil
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}
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func (displayElementExec) drawText(c *freetype.Context, text string, textColor color.Color, fontsize float64, border int) error {
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c.SetSrc(image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0x0})) // Transparent for text size guessing
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textLines := strings.Split(text, "\n")
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for {
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c.SetFontSize(fontsize)
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var maxX fixed.Int26_6
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for _, tl := range textLines {
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ext, err := c.DrawString(tl, freetype.Pt(0, 0))
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if err != nil {
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return errors.Wrap(err, "Unable to measure text")
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}
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if ext.X > maxX {
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maxX = ext.X
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}
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}
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if int(float64(maxX)/64) > sd.IconSize()-2*border || (int(c.PointToFixed(fontsize)/64))*len(textLines)+(len(textLines)-1)*2 > sd.IconSize()-2*border {
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fontsize -= 2
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continue
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}
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break
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}
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var (
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yTotal = (int(c.PointToFixed(fontsize)/64))*len(textLines) + len(textLines)*2
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yLineTop = int(float64(sd.IconSize())/2.0 - float64(yTotal)/2.0)
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)
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for _, tl := range textLines {
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c.SetSrc(image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0x0})) // Transparent for text size guessing
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ext, err := c.DrawString(tl, freetype.Pt(0, 0))
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if err != nil {
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return errors.Wrap(err, "Unable to measure text")
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}
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c.SetSrc(image.NewUniform(textColor))
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xcenter := (float64(sd.IconSize()-2*border) / 2.0) - (float64(int(float64(ext.X)/64)) / 2.0) + float64(border)
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ylower := yLineTop + int(c.PointToFixed(fontsize)/64)
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if _, err = c.DrawString(tl, freetype.Pt(int(xcenter), int(ylower))); err != nil {
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return errors.Wrap(err, "Unable to draw text")
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}
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yLineTop += int(c.PointToFixed(fontsize)/64) + 2
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}
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return nil
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}
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func (displayElementExec) getImageFromDisk(filename string) (image.Image, error) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, errors.Wrap(err, "Unable to open image")
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}
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defer f.Close()
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img, _, err := image.Decode(f)
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if err != nil {
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return nil, errors.Wrap(err, "Umable to decode image")
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}
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return img, nil
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}
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func (displayElementExec) loadFont() (*truetype.Font, error) {
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fontRaw, err := ioutil.ReadFile(userConfig.RenderFont)
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if err != nil {
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return nil, errors.Wrap(err, "Unable to read font file")
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}
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return truetype.Parse(fontRaw)
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}
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142
cmd/streamdeck/helper_displayText.go
Normal file
142
cmd/streamdeck/helper_displayText.go
Normal file
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@ -0,0 +1,142 @@
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package main
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import (
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"image"
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"image/color"
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"image/draw"
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"io/ioutil"
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"os"
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"strings"
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"github.com/golang/freetype"
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"github.com/golang/freetype/truetype"
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"github.com/pkg/errors"
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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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type textOnImageRenderer struct {
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img draw.Image
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}
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func newTextOnImageRenderer() *textOnImageRenderer {
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// Create new black image in icon size
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var img draw.Image = image.NewRGBA(image.Rect(0, 0, sd.IconSize(), sd.IconSize()))
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draw.Draw(img, img.Bounds(), image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0xff}), image.ZP, draw.Src)
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return &textOnImageRenderer{
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img: img,
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}
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}
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func (t *textOnImageRenderer) DrawBackground(bgi image.Image) {
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bgi = autoSizeImage(bgi, sd.IconSize())
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draw.Draw(t.img, t.img.Bounds(), bgi, image.ZP, draw.Src)
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}
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func (t *textOnImageRenderer) DrawBackgroundFromFile(filename string) error {
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bgi, err := t.getImageFromDisk(filename)
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if err != nil {
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return errors.Wrap(err, "Unable to get image from disk")
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}
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t.DrawBackground(bgi)
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return nil
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}
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func (t *textOnImageRenderer) DrawBigText(text string, fontSizeHint float64, border int, textColor color.Color) error {
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// Render text
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f, err := t.loadFont()
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if err != nil {
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return errors.Wrap(err, "Unable to load font")
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}
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c := freetype.NewContext()
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c.SetClip(t.img.Bounds())
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c.SetDPI(72)
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c.SetDst(t.img)
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c.SetFont(f)
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c.SetHinting(font.HintingNone)
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return t.drawText(c, text, textColor, fontSizeHint, border)
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}
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func (t textOnImageRenderer) GetImage() image.Image { return t.img }
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func (t *textOnImageRenderer) drawText(c *freetype.Context, text string, textColor color.Color, fontsize float64, border int) error {
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c.SetSrc(image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0x0})) // Transparent for text size guessing
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textLines := strings.Split(text, "\n")
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for {
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c.SetFontSize(fontsize)
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var maxX fixed.Int26_6
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for _, tl := range textLines {
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ext, err := c.DrawString(tl, freetype.Pt(0, 0))
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if err != nil {
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return errors.Wrap(err, "Unable to measure text")
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}
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if ext.X > maxX {
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maxX = ext.X
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}
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}
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if int(float64(maxX)/64) > sd.IconSize()-2*border || (int(c.PointToFixed(fontsize)/64))*len(textLines)+(len(textLines)-1)*2 > sd.IconSize()-2*border {
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fontsize -= 2
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continue
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}
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break
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}
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var (
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yTotal = (int(c.PointToFixed(fontsize)/64))*len(textLines) + len(textLines)*2
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yLineTop = int(float64(sd.IconSize())/2.0 - float64(yTotal)/2.0)
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)
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for _, tl := range textLines {
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c.SetSrc(image.NewUniform(color.RGBA{0x0, 0x0, 0x0, 0x0})) // Transparent for text size guessing
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ext, err := c.DrawString(tl, freetype.Pt(0, 0))
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if err != nil {
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return errors.Wrap(err, "Unable to measure text")
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}
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c.SetSrc(image.NewUniform(textColor))
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xcenter := (float64(sd.IconSize()-2*border) / 2.0) - (float64(int(float64(ext.X)/64)) / 2.0) + float64(border)
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ylower := yLineTop + int(c.PointToFixed(fontsize)/64)
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if _, err = c.DrawString(tl, freetype.Pt(int(xcenter), int(ylower))); err != nil {
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return errors.Wrap(err, "Unable to draw text")
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}
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yLineTop += int(c.PointToFixed(fontsize)/64) + 2
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}
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return nil
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}
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func (textOnImageRenderer) getImageFromDisk(filename string) (image.Image, error) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, errors.Wrap(err, "Unable to open image")
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}
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defer f.Close()
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img, _, err := image.Decode(f)
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if err != nil {
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return nil, errors.Wrap(err, "Umable to decode image")
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}
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return img, nil
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}
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func (textOnImageRenderer) loadFont() (*truetype.Font, error) {
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fontRaw, err := ioutil.ReadFile(userConfig.RenderFont)
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if err != nil {
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return nil, errors.Wrap(err, "Unable to read font file")
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}
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return truetype.Parse(fontRaw)
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}
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