aljaz/njump
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replace fancy dynamic font size detector with a mathematical formula that should be good enough.

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the fancy thing was breaking for all japanese and chinese notes, and in some english notes too, I don't know why.

it also gave me a bad feeling because it was a loop that seemed expensive.
This commit is contained in:
fiatjaf
2023-12-31 17:50:43 -03:00
parent 91a0ea768b
commit 51a5bd770a
1 changed files with 21 additions and 31 deletions
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52
render_image.go
View File

@@ -82,6 +82,7 @@ func renderImage(w http.ResponseWriter, r *http.Request) {
}
func drawImage(paragraphs []string, style Style, metadata sdk.ProfileMetadata, date string) (image.Image, error) {
fontSize := 25
width := 700
height := 525
paddingLeft := 25
@@ -102,10 +103,23 @@ func drawImage(paragraphs []string, style Style, metadata sdk.ProfileMetadata, d
img.SetColor(FOREGROUND)
// main content text
textImg := drawText(paragraphs, width-paddingLeft*2, height-20, true)
dynamicFontSize := fontSize
if np := len(paragraphs); np < 4 {
nchars := 0
for _, par := range paragraphs {
nchars += len([]rune(par))
}
largeness := math.Pow(float64(nchars), 0.60) +
math.Pow(float64(np-1), 0.80)
addedSize := 240.0 / largeness
dynamicFontSize = fontSize + int(addedSize)
fmt.Println("font size:", dynamicFontSize, largeness, "|", nchars, np, "|", math.Pow(float64(nchars), 1.16), float64(np)*9, "|", paragraphs)
}
textImg := drawText(paragraphs, dynamicFontSize, width-paddingLeft*2, height-20)
img.DrawImage(textImg, paddingLeft, 20)
// font for writing the bottom bar stuff
// font for writing the date
fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf")
ttf, _ := truetype.Parse(fontData)
img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
@@ -144,7 +158,7 @@ func drawImage(paragraphs []string, style Style, metadata sdk.ProfileMetadata, d
authorTextY := height - barHeight + 15
authorMaxWidth := width/2.0 - paddingLeft*2 - barExtraPadding
img.SetColor(color.White)
textImg = drawText([]string{metadata.ShortName()}, width, barHeight, false)
textImg = drawText([]string{metadata.ShortName()}, fontSize, width, barHeight)
img.DrawImage(textImg, authorTextX, authorTextY)
// a gradient to cover too long names
@@ -177,38 +191,14 @@ func drawImage(paragraphs []string, style Style, metadata sdk.ProfileMetadata, d
return img.Image(), nil
}
func drawText(paragraphs []string, width, height int, dynamicResize bool) image.Image {
FONT_SIZE := 25
func drawText(paragraphs []string, fontSize int, width, height int) image.Image {
img := image.NewNRGBA(image.Rect(0, 0, width, height))
joinedContent := strings.Join(paragraphs, " \n") // the space before the \n is necessary
if dynamicResize && len(joinedContent) < 141 {
fontSizeTest := 7.0
step := 0.5
img := gg.NewContext(width, height)
fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf")
ttf, _ := truetype.Parse(fontData)
for {
fontSizeTest += step
img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
Size: fontSizeTest,
DPI: 260,
}))
wrappedContent := img.WordWrap(joinedContent, float64(width-70))
_, checkHeight := img.MeasureMultilineString(strings.Join(wrappedContent, "\n"), 1.0)
if checkHeight > float64(height-70-60*2) || fontSizeTest > 50 {
fontSizeTest -= step
break
}
}
FONT_SIZE = int(fontSizeTest * (float64(FONT_SIZE) / 7))
}
lineNumber := 1
for _, paragraph := range paragraphs {
rawText := []rune(paragraph)
shapedRunes, emojiMask, hlMask := shapeText(rawText, FONT_SIZE)
shapedRunes, emojiMask, hlMask := shapeText(rawText, fontSize)
var wrapper shaping.LineWrapper
it := shaping.NewSliceIterator([]shaping.Output{shapedRunes})
@@ -219,7 +209,7 @@ func drawText(paragraphs []string, width, height int, dynamicResize bool) image.
for _, out := range line {
charsWritten, _ := drawShapedBlockAt(
img,
FONT_SIZE,
fontSize,
[4]color.Color{
color.RGBA{R: 255, G: 230, B: 238, A: 255}, // normal
color.RGBA{R: 146, G: 193, B: 198, A: 255}, // links
@@ -231,7 +221,7 @@ func drawText(paragraphs []string, width, height int, dynamicResize bool) image.
hlMask,
totalCharsWritten,
0,
FONT_SIZE*lineNumber*12/10,
fontSize*lineNumber*12/10,
)
totalCharsWritten += charsWritten
lineNumber++