Merge branch 'use-go-text-typesetting'

go.mod

@@ -4,25 +4,28 @@ go 1.21.4
 
 require (
 	github.com/PuerkitoBio/goquery v1.5.0
-	github.com/apatters/go-wordwrap v1.0.0
 	github.com/dgraph-io/badger/v4 v4.2.0
 	github.com/fiatjaf/eventstore v0.3.3
 	github.com/fiatjaf/khatru v0.2.1
 	github.com/fogleman/gg v1.3.0
+	github.com/go-text/typesetting v0.0.0-20231221124458-48cc05a56658
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
 	github.com/gomarkdown/markdown v0.0.0-20231115200524-a660076da3fd
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/microcosm-cc/bluemonday v1.0.24
+	github.com/nbd-wtf/emoji v0.0.3
 	github.com/nbd-wtf/go-nostr v0.27.3
 	github.com/nbd-wtf/nostr-sdk v0.0.4
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	github.com/pelletier/go-toml v1.9.5
+	github.com/pemistahl/lingua-go v1.4.0
 	github.com/rs/cors v1.10.0
 	github.com/rs/zerolog v1.29.1
+	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef
 	github.com/stretchr/testify v1.8.4
 	github.com/texttheater/golang-levenshtein v1.0.1
 	github.com/tylermmorton/tmpl v0.0.0-20231025031313-5552ee818c6d
-	golang.org/x/exp v0.0.0-20231006140011-7918f672742d
+	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b
 	golang.org/x/image v0.14.0
 	mvdan.cc/xurls/v2 v2.5.0
 )
@@ -61,6 +64,7 @@ require (
 	github.com/puzpuzpuz/xsync/v2 v2.5.1 // indirect
 	github.com/savsgio/gotils v0.0.0-20230208104028-c358bd845dee // indirect
 	github.com/sebest/xff v0.0.0-20210106013422-671bd2870b3a // indirect
+	github.com/shopspring/decimal v1.3.1 // indirect
 	github.com/tidwall/gjson v1.17.0 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
@@ -69,6 +73,9 @@ require (
 	go.opencensus.io v0.24.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+replace github.com/go-text/typesetting => github.com/fiatjaf/typesetting v0.0.0-20231228183257-7c3f6f5a0ccc

go.sum

@@ -7,8 +7,6 @@ github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/
 github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 github.com/andybalholm/cascadia v1.0.0 h1:hOCXnnZ5A+3eVDX8pvgl4kofXv2ELss0bKcqRySc45o=
 github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
-github.com/apatters/go-wordwrap v1.0.0 h1:G6ni4Pt7/I4ED+A5ZvsK8e9XwETD04veDKxEL2QN830=
-github.com/apatters/go-wordwrap v1.0.0/go.mod h1:3sM7HcArQ+utXnjDQ4d1xjrd8b/wbKuDr/RmbiHgjwI=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
@@ -72,10 +70,14 @@ github.com/fiatjaf/eventstore v0.3.3 h1:yZgHecBwHCVU+FuLgwz3gJJu27Xq4P8CNld37mQi
 github.com/fiatjaf/eventstore v0.3.3/go.mod h1:iqGHNXOMz+ztLHXxG13WBXgz/2bG0q/p1L3olof4dYo=
 github.com/fiatjaf/khatru v0.2.1 h1:NlgjBYH7iJpjFyOJVNEX/E2I1v4d5+KINhA+VxgDr4o=
 github.com/fiatjaf/khatru v0.2.1/go.mod h1:DsiQEmQmb6/hTXV6/OMcF7C7h19u1tJG5zAgaQVjseY=
+github.com/fiatjaf/typesetting v0.0.0-20231228183257-7c3f6f5a0ccc h1:8QpOKCVr8jpuvpmLCZUnsZ50faseCym2r6f5crpODKM=
+github.com/fiatjaf/typesetting v0.0.0-20231228183257-7c3f6f5a0ccc/go.mod h1:d22AnmeKq/on0HNv73UFriMKc4Ez6EqZAofLhAzpSzI=
 github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/go-text/typesetting-utils v0.0.0-20231211103740-d9332ae51f04 h1:zBx+p/W2aQYtNuyZNcTfinWvXBQwYtDfme051PR/lAY=
+github.com/go-text/typesetting-utils v0.0.0-20231211103740-d9332ae51f04/go.mod h1:DDxDdQEnB70R8owOx3LVpEFvpMK9eeH1o2r0yZhFI9o=
 github.com/gobwas/httphead v0.1.0 h1:exrUm0f4YX0L7EBwZHuCF4GDp8aJfVeBrlLQrs6NqWU=
 github.com/gobwas/httphead v0.1.0/go.mod h1:O/RXo79gxV8G+RqlR/otEwx4Q36zl9rqC5u12GKvMCM=
 github.com/gobwas/pool v0.2.1 h1:xfeeEhW7pwmX8nuLVlqbzVc7udMDrwetjEv+TZIz1og=
@@ -138,8 +140,8 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
 github.com/klauspost/compress v1.17.2 h1:RlWWUY/Dr4fL8qk9YG7DTZ7PDgME2V4csBXA8L/ixi4=
 github.com/klauspost/compress v1.17.2/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
@@ -150,6 +152,8 @@ github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/microcosm-cc/bluemonday v1.0.24 h1:NGQoPtwGVcbGkKfvyYk1yRqknzBuoMiUrO6R7uFTPlw=
 github.com/microcosm-cc/bluemonday v1.0.24/go.mod h1:ArQySAMps0790cHSkdPEJ7bGkF2VePWH773hsJNSHf8=
+github.com/nbd-wtf/emoji v0.0.3 h1:YtkT7MVPXvqU1SQjvC/CShlWexnREzqNCxmhUnL00CA=
+github.com/nbd-wtf/emoji v0.0.3/go.mod h1:tS6D9iI34qwBmWc5g8X7tVDkWXulqbTJRsvsM6QsS88=
 github.com/nbd-wtf/go-nostr v0.27.3 h1:u9fdP5h+Ap3LcDFD2j6F2buU/xOM9ddMY0LCDcC6ZyY=
 github.com/nbd-wtf/go-nostr v0.27.3/go.mod h1:e5WOFsKEpslDOxIgK00NqemH7KuAvKIW6sBXeJYCfUs=
 github.com/nbd-wtf/nostr-sdk v0.0.4 h1:vMCiYpFElKMHPXpZjFVEq4utoTLdTYbkqXVYH1/4uzs=
@@ -167,6 +171,8 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
 github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
+github.com/pemistahl/lingua-go v1.4.0 h1:ifYhthrlW7iO4icdubwlduYnmwU37V1sbNrwhKBR4rM=
+github.com/pemistahl/lingua-go v1.4.0/go.mod h1:ECuM1Hp/3hvyh7k8aWSqNCPlTxLemFZsRjocUf3KgME=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -174,6 +180,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/puzpuzpuz/xsync/v2 v2.5.1 h1:mVGYAvzDSu52+zaGyNjC+24Xw2bQi3kTr4QJ6N9pIIU=
 github.com/puzpuzpuz/xsync/v2 v2.5.1/go.mod h1:gD2H2krq/w52MfPLE+Uy64TzJDVY7lP2znR9qmR35kU=
+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/rs/cors v1.10.0 h1:62NOS1h+r8p1mW6FM0FSB0exioXLhd/sh15KpjWBZ+8=
 github.com/rs/cors v1.10.0/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
@@ -183,10 +191,13 @@ github.com/savsgio/gotils v0.0.0-20230208104028-c358bd845dee h1:8Iv5m6xEo1NR1Avp
 github.com/savsgio/gotils v0.0.0-20230208104028-c358bd845dee/go.mod h1:qwtSXrKuJh/zsFQ12yEE89xfCrGKK63Rr7ctU/uCo4g=
 github.com/sebest/xff v0.0.0-20210106013422-671bd2870b3a h1:iLcLb5Fwwz7g/DLK89F+uQBDeAhHhwdzB5fSlVdhGcM=
 github.com/sebest/xff v0.0.0-20210106013422-671bd2870b3a/go.mod h1:wozgYq9WEBQBaIJe4YZ0qTSFAMxmcwBhQH0fO0R34Z0=
+github.com/shopspring/decimal v1.3.1 h1:2Usl1nmF/WZucqkFZhnfFYxxxu8LG21F6nPQBE5gKV8=
+github.com/shopspring/decimal v1.3.1/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef h1:Ch6Q+AZUxDBCVqdkI8FSpFyZDtCVBc2VmejdNrm5rRQ=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef/go.mod h1:nXTWP6+gD5+LUJ8krVhhoeHjvHTutPxMYl5SvkcnJNE=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -219,8 +230,8 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
-golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b h1:kLiC65FbiHWFAOu+lxwNPujcsl8VYyTYYEZnsOO1WK4=
-golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
 golang.org/x/image v0.14.0 h1:tNgSxAFe3jC4uYqvZdTr84SZoM1KfwdC9SKIFrLjFn4=
 golang.org/x/image v0.14.0/go.mod h1:HUYqC05R2ZcZ3ejNQsIHQDQiwWM4JBqmm6MKANTp4LE=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -271,6 +282,8 @@ golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=

image_utils.go

@@ -0,0 +1,622 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"image"
+	"image/color"
+	"image/draw"
+	"math"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/fogleman/gg"
+	"github.com/go-text/typesetting/di"
+	"github.com/go-text/typesetting/font"
+	"github.com/go-text/typesetting/harfbuzz"
+	"github.com/go-text/typesetting/language"
+	"github.com/go-text/typesetting/opentype/api"
+	"github.com/go-text/typesetting/shaping"
+	"github.com/nbd-wtf/emoji"
+	"github.com/pemistahl/lingua-go"
+	"github.com/srwiley/rasterx"
+	"golang.org/x/image/math/fixed"
+)
+
+const (
+	nSupportedScripts = 14
+	scaleShift        = 6
+)
+
+var (
+	supportedScripts = [nSupportedScripts]language.Script{
+		language.Unknown,
+		language.Latin,
+		language.Cyrillic,
+		language.Hiragana,
+		language.Katakana,
+		language.Hebrew,
+		language.Thai,
+		language.Arabic,
+		language.Devanagari,
+		language.Bengali,
+		language.Javanese,
+		language.Han,
+		language.Hangul,
+		language.Syriac,
+	}
+
+	detector     lingua.LanguageDetector
+	scriptRanges []ScriptRange
+	fontMap      [nSupportedScripts]font.Face
+	emojiFace    font.Face
+
+	defaultLanguageMap = [nSupportedScripts]language.Language{
+		"en-us",
+		"en-us",
+		"ru",
+		"ja",
+		"ja",
+		"he",
+		"th",
+		"ar",
+		"hi",
+		"bn",
+		"jv",
+		"zh",
+		"ko",
+		"syr",
+	}
+
+	directionMap = [nSupportedScripts]di.Direction{
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionRTL,
+		di.DirectionLTR,
+		di.DirectionRTL,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionLTR,
+		di.DirectionRTL,
+	}
+
+	shaperLock  sync.Mutex
+	mainBuffer  = harfbuzz.NewBuffer()
+	emojiBuffer = harfbuzz.NewBuffer()
+	fontCache   = make(map[font.Face]*harfbuzz.Font)
+	emojiFont   *harfbuzz.Font
+)
+
+type ScriptRange struct {
+	Start  rune
+	End    rune
+	Pos    int
+	Script language.Script
+}
+
+func initializeImageDrawingStuff() error {
+	// language detector
+	detector = lingua.NewLanguageDetectorBuilder().FromLanguages(
+		lingua.Japanese,
+		lingua.Persian,
+		lingua.Chinese,
+		lingua.Thai,
+		lingua.Hebrew,
+		lingua.Arabic,
+		lingua.Bengali,
+		lingua.Hindi,
+		lingua.Korean,
+	).WithLowAccuracyMode().Build()
+
+	// script detector material
+	for _, srange := range language.ScriptRanges {
+		for ssi, script := range supportedScripts {
+			if srange.Script == script {
+				scriptRanges = append(scriptRanges, ScriptRange{
+					Start:  srange.Start,
+					End:    srange.End,
+					Script: srange.Script,
+					Pos:    ssi,
+				})
+			}
+		}
+	}
+
+	// fonts
+	loadFont := func(filepath string) font.Face {
+		fontData, err := fonts.ReadFile(filepath)
+		face, err := font.ParseTTF(bytes.NewReader(fontData))
+		if err != nil {
+			log.Fatal().Err(err).Str("path", filepath).Msg("error loading font on startup")
+			return nil
+		}
+		return face
+	}
+	fontMap[0] = loadFont("fonts/NotoSans.ttf")
+	fontMap[1] = fontMap[0]
+	fontMap[2] = fontMap[0]
+	fontMap[3] = loadFont("fonts/NotoSansJP.ttf")
+	fontMap[4] = fontMap[3]
+	fontMap[5] = loadFont("fonts/NotoSansHebrew.ttf")
+	fontMap[6] = loadFont("fonts/NotoSansThai.ttf")
+	fontMap[7] = loadFont("fonts/NotoSansArabic.ttf")
+	fontMap[8] = loadFont("fonts/NotoSansDevanagari.ttf")
+	fontMap[9] = loadFont("fonts/NotoSansBengali.ttf")
+	fontMap[10] = loadFont("fonts/NotoSansJavanese.ttf")
+	fontMap[11] = loadFont("fonts/NotoSansSC.ttf")
+	fontMap[12] = loadFont("fonts/NotoSansKR.ttf")
+	emojiFace = loadFont("fonts/NotoEmoji.ttf")
+
+	// shaper stuff
+	emojiFont = harfbuzz.NewFont(emojiFace)
+
+	return nil
+}
+
+// quotesAsBlockPrefixedText replaces nostr:nevent1... and note with their text, as an extra line
+// prefixed by BLOCK this returns a slice of lines
+func quotesAsBlockPrefixedText(ctx context.Context, lines []string) []string {
+	ctx, cancel := context.WithTimeout(ctx, time.Second*3)
+	defer cancel()
+
+	blocks := make([]string, 0, len(lines)+7)
+
+	for _, line := range lines {
+		matches := nostrNoteNeventMatcher.FindAllStringSubmatchIndex(line, -1)
+
+		if len(matches) == 0 {
+			// no matches, just return text as it is
+			blocks = append(blocks, line)
+			continue
+		}
+
+		// one or more matches, return multiple lines
+		blocks = append(blocks, line[0:matches[0][0]])
+		i := -1 // matches iteration counter
+		b := 0  // current block index
+		for _, match := range matches {
+			i++
+
+			matchText := line[match[0]:match[1]]
+			submatch := nostrNoteNeventMatcher.FindStringSubmatch(matchText)
+			nip19 := submatch[0][6:]
+
+			event, _, err := getEvent(ctx, nip19, nil)
+			if err != nil {
+				// error case concat this to previous block
+				blocks[b] += matchText
+				continue
+			}
+
+			// add a new block with the quoted text
+			blocks = append(blocks, BLOCK+" "+event.Content)
+
+			// increase block count
+			b++
+		}
+		// add remaining text after the last match
+		remainingText := line[matches[i][1]:]
+		if strings.TrimSpace(remainingText) != "" {
+			blocks = append(blocks, remainingText)
+		}
+	}
+
+	return blocks
+}
+
+func getLanguageAndScriptAndDirectionAndFont(paragraph []rune) (
+	language.Language,
+	language.Script,
+	di.Direction,
+	font.Face,
+) {
+	var ranking [nSupportedScripts]int
+	nLetters := len(paragraph)
+	threshold := nLetters / 2
+	var script language.Script
+	var face font.Face
+	var idx int
+	for l := 0; l < nLetters; l++ {
+		rnidx := lookupScript(paragraph[l])
+		ranking[rnidx]++
+		if idx > 0 && l > threshold && ranking[rnidx] > threshold {
+			idx = rnidx
+			goto gotScriptIndex
+		}
+	}
+	idx = maxIndex(ranking[2:] /* skip Unknown and Latin because they are the default */)
+	idx += 2 // add back the skipped indexes (if maxIndex returns -1 this will default us to 1, latin)
+
+gotScriptIndex:
+	script = supportedScripts[idx]
+	face = fontMap[idx]
+	direction := directionMap[idx]
+
+	lng := language.Language("en-us")
+	lang, ok := detector.DetectLanguageOf(string(paragraph))
+	if ok {
+		lng = language.Language(lang.IsoCode639_1().String())
+	} else {
+		lng = defaultLanguageMap[idx]
+	}
+
+	return lng, script, direction, face
+}
+
+func fetchImageFromURL(url string) (image.Image, error) {
+	response, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	img, _, err := image.Decode(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return img, nil
+}
+
+func roundImage(img image.Image) image.Image {
+	bounds := img.Bounds()
+	diameter := math.Min(float64(bounds.Dx()), float64(bounds.Dy()))
+	radius := diameter / 2
+
+	// Create a new context for the mask
+	mask := gg.NewContext(bounds.Dx(), bounds.Dy())
+	mask.SetColor(color.Black) // Set the mask color to fully opaque
+	mask.DrawCircle(float64(bounds.Dx())/2, float64(bounds.Dy())/2, radius)
+	mask.ClosePath()
+	mask.Fill()
+
+	// Apply the circular mask to the original image
+	result := image.NewRGBA(bounds)
+	maskImg := mask.Image()
+	draw.DrawMask(result, bounds, img, image.Point{}, maskImg, image.Point{}, draw.Over)
+
+	return result
+}
+
+func cropToSquare(img image.Image) image.Image {
+	bounds := img.Bounds()
+	size := int(math.Min(float64(bounds.Dx()), float64(bounds.Dy())))
+	squareImg := image.NewRGBA(image.Rect(0, 0, size, size))
+	for x := 0; x < size; x++ {
+		for y := 0; y < size; y++ {
+			squareImg.Set(x, y, img.At(x+(bounds.Dx()-size)/2, y+(bounds.Dy()-size)/2))
+		}
+	}
+	return squareImg
+}
+
+func lookupScript(r rune) int {
+	// binary search
+	for i, j := 0, len(scriptRanges); i < j; {
+		h := i + (j-i)/2
+		entry := scriptRanges[h]
+		if r < entry.Start {
+			j = h
+		} else if entry.End < r {
+			i = h + 1
+		} else {
+			return entry.Pos // position in supportedScripts
+		}
+	}
+	return 0 // unknown
+}
+
+// shortenURLs takes a text content and returns the same content, but with all big URLs like https://image.nostr.build/0993112ab590e04b978ad32002005d42c289d43ea70d03dafe9ee99883fb7755.jpg#m=image%2Fjpeg&dim=1361x1148&blurhash=%3B7Jjhw00.l.QEh%3FuIA-pMe00%7EVjXX8x%5DE2xuSgtQcr%5E%2500%3FHxD%24%25%25Ms%2Bt%2B-%3BVZK59a%252MyD%2BV%5BI.8%7Ds%3B%25Lso-oi%5ENINHnjI%3BR*%3DdM%7BX7%25MIUtksn%24LM%7BMySeR%25R*%251M%7DRkv%23RjtjS%239as%3AxDnO%251&x=61be75a3e3e0cc88e7f0e625725d66923fdd777b3b691a1c7072ba494aef188d shortened to something like https://image.nostr.build/.../...7755.jpg
+func shortenURLs(text string) string {
+	return urlMatcher.ReplaceAllStringFunc(text, func(match string) string {
+		if len(match) < 50 {
+			return match
+		}
+
+		parsed, err := url.Parse(match)
+		if err != nil {
+			return match
+		}
+
+		parsed.Fragment = ""
+
+		if len(parsed.RawQuery) > 10 {
+			parsed.RawQuery = ""
+		}
+
+		pathParts := strings.Split(parsed.Path, "/")
+		nParts := len(pathParts)
+		lastPart := pathParts[nParts-1]
+		if len(lastPart) > 12 {
+			pathParts[nParts-1] = "…" + lastPart[len(lastPart)-11:]
+		}
+		if nParts > 2 {
+			pathParts[1] = "…"
+			pathParts[2] = pathParts[nParts-1]
+			pathParts = pathParts[0:2]
+		}
+
+		parsed.Path = "/////"
+		urlStr := parsed.String()
+		return strings.Replace(urlStr, "/////", strings.Join(pathParts, "/"), 1)
+	})
+}
+
+// beware: this is all very hacky and I don't know what I am doing!
+// this function is copied from go-text/typesetting/shaping's HarfbuzzShaper and adapted to not require a "class",
+// to rely on our dirty globals like fontCache, shaperLock and mainBuffer; it also uses a custom function to
+// determine language, script, direction and font face internally instead of taking a shaping.Input argument --
+// but also, the most important change was to make it "shape" the same text, twice, with the default font and with
+// the emoji font, then build an output of glyphs containing normal glyphs for when the referenced rune is not an
+// emoji and an emoji glyph for when it is.
+func shapeText(rawText []rune, fontSize int) (shaping.Output, []bool) {
+	lang, script, dir, face := getLanguageAndScriptAndDirectionAndFont(rawText)
+
+	shaperLock.Lock()
+	defer shaperLock.Unlock()
+
+	// load or get main font from cache
+	mainFont, ok := fontCache[face]
+	if !ok {
+		mainFont = harfbuzz.NewFont(face)
+		fontCache[face] = mainFont
+	}
+
+	// define this only once
+	input := shaping.Input{
+		Text:      rawText,
+		RunStart:  0,
+		RunEnd:    len(rawText),
+		Face:      face,
+		Size:      fixed.I(int(fontSize)),
+		Script:    script,
+		Language:  lang,
+		Direction: dir,
+	}
+
+	// shape stuff for both normal text and emojis
+	for _, params := range []struct {
+		font *harfbuzz.Font
+		buf  *harfbuzz.Buffer
+	}{
+		{mainFont, mainBuffer},
+		{emojiFont, emojiBuffer},
+	} {
+		params.buf.Clear() // clear before using
+
+		runes, start, end := input.Text, input.RunStart, input.RunEnd
+		if end < start {
+			panic("end < start")
+		}
+		start = clamp(start, 0, len(runes))
+		end = clamp(end, 0, len(runes))
+		params.buf.AddRunes(runes, start, end-start)
+
+		params.buf.Props.Direction = input.Direction.Harfbuzz()
+		params.buf.Props.Language = input.Language
+		params.buf.Props.Script = input.Script
+
+		// adjust the user provided fields
+		params.font.XScale = int32(input.Size.Ceil()) << scaleShift
+		params.font.YScale = params.font.XScale
+
+		// actually use harfbuzz to shape the text.
+		params.buf.Shape(params.font, nil)
+	}
+
+	// this will be used to determine whether a given glyph is an emoji or not when rendering
+	emojiMask := make([]bool, len(emojiBuffer.Info))
+
+	if len(mainBuffer.Info) > len(emojiBuffer.Info) {
+		// remove from mainBuffer characters that are not present in emojiBuffer
+		newMainBufferInfo := make([]harfbuzz.GlyphInfo, len(emojiBuffer.Info))
+		newMainBufferPos := make([]harfbuzz.GlyphPosition, len(emojiBuffer.Info))
+		for e, m := 0, 0; e < len(emojiBuffer.Info); {
+			ec := emojiBuffer.Info[e].Codepoint
+			if ec == mainBuffer.Info[m].Codepoint {
+				newMainBufferInfo[e] = mainBuffer.Info[m]
+				newMainBufferPos[e] = mainBuffer.Pos[m]
+
+				if emoji.IsEmoji(ec) || emoji.IsTag(ec) || emoji.IsRegionalIndicator(ec) {
+					emojiMask[e] = true
+				}
+
+				e++
+				m++
+			} else {
+				m++
+				for ; emojiBuffer.Info[e].Codepoint != mainBuffer.Info[m].Codepoint; m++ {
+				}
+			}
+		}
+		mainBuffer.Info = newMainBufferInfo
+		mainBuffer.Pos = newMainBufferPos
+	} else {
+		// just go through the glyphs and decide which ones are emojis
+		for e := range emojiBuffer.Info {
+			ec := emojiBuffer.Info[e].Codepoint
+			if emoji.IsEmoji(ec) || emoji.IsTag(ec) || emoji.IsRegionalIndicator(ec) {
+				emojiMask[e] = true
+			}
+		}
+	}
+
+	// convert the shaped text into an output
+	glyphs := make([]shaping.Glyph, len(mainBuffer.Info))
+	for i := 0; i < len(glyphs); i++ {
+		var buf *harfbuzz.Buffer
+		var font *harfbuzz.Font
+		if emojiMask[i] {
+			buf = emojiBuffer
+			font = emojiFont
+		} else {
+			buf = mainBuffer
+			font = mainFont
+		}
+		glyph := buf.Info[i]
+
+		glyphs[i] = shaping.Glyph{
+			ClusterIndex: glyph.Cluster,
+			GlyphID:      glyph.Glyph,
+			Mask:         glyph.Mask,
+		}
+		extents, ok := font.GlyphExtents(glyph.Glyph)
+		if !ok {
+			continue
+		}
+		glyphs[i].Width = fixed.I(int(extents.Width)) >> scaleShift
+		glyphs[i].Height = fixed.I(int(extents.Height)) >> scaleShift
+		glyphs[i].XBearing = fixed.I(int(extents.XBearing)) >> scaleShift
+		glyphs[i].YBearing = fixed.I(int(extents.YBearing)) >> scaleShift
+		glyphs[i].XAdvance = fixed.I(int(buf.Pos[i].XAdvance)) >> scaleShift
+		glyphs[i].YAdvance = fixed.I(int(buf.Pos[i].YAdvance)) >> scaleShift
+		glyphs[i].XOffset = fixed.I(int(buf.Pos[i].XOffset)) >> scaleShift
+		glyphs[i].YOffset = fixed.I(int(buf.Pos[i].YOffset)) >> scaleShift
+	}
+
+	countClusters(glyphs, input.RunEnd, input.Direction.Progression())
+	out := shaping.Output{
+		Glyphs:    glyphs,
+		Direction: input.Direction,
+		Face:      input.Face,
+		Size:      input.Size,
+	}
+	out.Runes.Offset = input.RunStart
+	out.Runes.Count = input.RunEnd - input.RunStart
+
+	fontExtents := mainFont.ExtentsForDirection(out.Direction.Harfbuzz())
+	out.LineBounds = shaping.Bounds{
+		Ascent:  fixed.I(int(fontExtents.Ascender)) >> scaleShift,
+		Descent: fixed.I(int(fontExtents.Descender)) >> scaleShift,
+		Gap:     fixed.I(int(fontExtents.LineGap)) >> scaleShift,
+	}
+	out.RecalculateAll()
+
+	return out, emojiMask
+}
+
+// this function is copied from go-text/typesetting/shaping because shapeText needs it
+func countClusters(glyphs []shaping.Glyph, textLen int, dir di.Progression) {
+	currentCluster := -1
+	runesInCluster := 0
+	glyphsInCluster := 0
+	previousCluster := textLen
+	for i := range glyphs {
+		g := glyphs[i].ClusterIndex
+		if g != currentCluster {
+			// If we're processing a new cluster, count the runes and glyphs
+			// that compose it.
+			runesInCluster = 0
+			glyphsInCluster = 1
+			currentCluster = g
+			nextCluster := -1
+		glyphCountLoop:
+			for k := i + 1; k < len(glyphs); k++ {
+				if glyphs[k].ClusterIndex == g {
+					glyphsInCluster++
+				} else {
+					nextCluster = glyphs[k].ClusterIndex
+					break glyphCountLoop
+				}
+			}
+			if nextCluster == -1 {
+				nextCluster = textLen
+			}
+			switch dir {
+			case di.FromTopLeft:
+				runesInCluster = nextCluster - currentCluster
+			case di.TowardTopLeft:
+				runesInCluster = previousCluster - currentCluster
+			}
+			previousCluster = g
+		}
+		glyphs[i].GlyphCount = glyphsInCluster
+		glyphs[i].RuneCount = runesInCluster
+	}
+}
+
+// this function is copied from go-text/render, but adapted to not require a "class" to be instantiated and also,
+// more importantly, to take an emojiMask parameter, with the same length as out.Glyphs, to determine when a
+// glyph should be rendered with the emoji font instead of with the default font
+func drawShapedRunAt(
+	img draw.Image,
+	fontSize int,
+	clr color.Color,
+	out shaping.Output,
+	emojiMask []bool,
+	maskBaseIndex int,
+	startX,
+	startY int,
+) (charsWritten int, endingX int) {
+	scale := float32(fontSize) / float32(out.Face.Upem())
+
+	b := img.Bounds()
+	scanner := rasterx.NewScannerGV(b.Dx(), b.Dy(), img, b)
+	f := rasterx.NewFiller(b.Dx(), b.Dy(), scanner)
+	f.SetColor(clr)
+	x := float32(startX)
+	y := float32(startY)
+	for i, g := range out.Glyphs {
+		xPos := x + fixed266ToFloat(g.XOffset)
+		yPos := y - fixed266ToFloat(g.YOffset)
+
+		face := out.Face
+		currentScale := scale
+		if emojiMask[maskBaseIndex+i] {
+			face = emojiFace
+			currentScale = float32(fontSize) / float32(face.Upem())
+		}
+
+		data := face.GlyphData(g.GlyphID)
+		switch format := data.(type) {
+		case api.GlyphOutline:
+			drawOutline(g, format, f, currentScale, xPos, yPos)
+		case nil:
+			continue
+		default:
+			panic("format not supported for glyph")
+		}
+
+		charsWritten++
+		x += fixed266ToFloat(g.XAdvance)
+	}
+	f.Draw()
+
+	return charsWritten, int(math.Ceil(float64(x)))
+}
+
+// this draws a font glyph (i.e. a letter) according to instructions and scale and whatever
+func drawOutline(g shaping.Glyph, bitmap api.GlyphOutline, f *rasterx.Filler, scale float32, x, y float32) {
+	for _, s := range bitmap.Segments {
+		switch s.Op {
+		case api.SegmentOpMoveTo:
+			f.Start(fixed.Point26_6{X: floatToFixed266(s.Args[0].X*scale + x), Y: floatToFixed266(-s.Args[0].Y*scale + y)})
+		case api.SegmentOpLineTo:
+			f.Line(fixed.Point26_6{X: floatToFixed266(s.Args[0].X*scale + x), Y: floatToFixed266(-s.Args[0].Y*scale + y)})
+		case api.SegmentOpQuadTo:
+			f.QuadBezier(fixed.Point26_6{X: floatToFixed266(s.Args[0].X*scale + x), Y: floatToFixed266(-s.Args[0].Y*scale + y)},
+				fixed.Point26_6{X: floatToFixed266(s.Args[1].X*scale + x), Y: floatToFixed266(-s.Args[1].Y*scale + y)})
+		case api.SegmentOpCubeTo:
+			f.CubeBezier(fixed.Point26_6{X: floatToFixed266(s.Args[0].X*scale + x), Y: floatToFixed266(-s.Args[0].Y*scale + y)},
+				fixed.Point26_6{X: floatToFixed266(s.Args[1].X*scale + x), Y: floatToFixed266(-s.Args[1].Y*scale + y)},
+				fixed.Point26_6{X: floatToFixed266(s.Args[2].X*scale + x), Y: floatToFixed266(-s.Args[2].Y*scale + y)})
+		}
+	}
+	f.Stop(true)
+}
+
+func fixed266ToFloat(i fixed.Int26_6) float32 {
+	return float32(float64(i) / 64)
+}
+
+func floatToFixed266(f float32) fixed.Int26_6 {
+	return fixed.Int26_6(int(float64(f) * 64))
+}

main.go

@@ -74,6 +74,10 @@ func main() {
 		tailwindDebugStuff = template.HTML(fmt.Sprintf("<script src=\"https://cdn.tailwindcss.com?plugins=typography\"></script><script>\n%s</script><style type=\"text/tailwindcss\">%s</style>", config, style))
 	}
 
+	// image rendering stuff
+	initializeImageDrawingStuff()
+
+	// eventstore and internal db
 	deinitCache := initCache()
 	defer deinitCache()
 

render_image.go

@@ -2,34 +2,26 @@ package main
 
 import (
 	"bytes"
-	"context"
 	"embed"
 	"fmt"
 	"image"
 	"image/color"
-	"image/draw"
 	"image/png"
 	"math"
 	"net/http"
+	"regexp"
 	"strings"
 	"time"
-	"unicode"
 
-	"github.com/apatters/go-wordwrap"
 	"github.com/fogleman/gg"
+	"github.com/go-text/typesetting/shaping"
 	"github.com/golang/freetype/truetype"
 	sdk "github.com/nbd-wtf/nostr-sdk"
 	"github.com/nfnt/resize"
-	"golang.org/x/image/font"
+	xfont "golang.org/x/image/font"
 )
 
 const (
-	MAX_LINES                = 20
-	MAX_CHARS_PER_LINE       = 50
-	MAX_CHARS_PER_QUOTE_LINE = 46
-	FONT_SIZE                = 7
-	FONT_DPI                 = 260
-
 	BLOCK = "|"
 )
 
@@ -42,6 +34,8 @@ var (
 //go:embed fonts/*
 var fonts embed.FS
 
+var multiNewlineRe = regexp.MustCompile(`\n\n+`)
+
 func renderImage(w http.ResponseWriter, r *http.Request) {
 	fmt.Println(r.URL.Path, ":~", r.Header.Get("user-agent"))
 
@@ -57,27 +51,21 @@ func renderImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// get the font and language specifics based on the characters used
+	content := data.event.Content
-	font, breakWords, err := getLanguage(data.event.Content)
+	content = strings.Replace(content, "\r\n", "\n", -1)
-	if err != nil {
+	content = multiNewlineRe.ReplaceAllString(content, "\n\n")
-		http.Error(w, "error getting font: "+err.Error(), 500)
+	content = strings.Replace(content, "\t", "  ", -1)
-		return
+	content = strings.Replace(content, "\r", "", -1)
-	}
+	content = shortenURLs(content)
-
-	content := strings.Replace(data.event.Content, "\n\n\n\n", "\n\n", -1)
-	content = strings.Replace(data.event.Content, "\n\n\n", "\n\n", -1)
 
 	// this turns the raw event.Content into a series of lines ready to drawn
-	lines := normalizeText(
+	paragraphs := replaceUserReferencesWithNames(r.Context(),
-		replaceUserReferencesWithNames(r.Context(),
+		quotesAsBlockPrefixedText(r.Context(),
-			renderQuotesAsBlockPrefixedText(r.Context(),
+			strings.Split(content, "\n"),
-				content,
 		),
-		),
-		breakWords,
 	)
 
-	img, err := drawImage(lines, font, getPreviewStyle(r), data.metadata, data.createdAt)
+	img, err := drawImage(paragraphs, getPreviewStyle(r), data.metadata, data.createdAt)
 	if err != nil {
 		log.Printf("error writing image: %s", err)
 		http.Error(w, "error writing image!", 500)
@@ -89,137 +77,16 @@ func renderImage(w http.ResponseWriter, r *http.Request) {
 
 	if err := png.Encode(w, img); err != nil {
 		log.Printf("error encoding image: %s", err)
-		http.Error(w, "error encoding image!", 500)
 		return
 	}
 }
 
-func normalizeText(input []string, breakWords bool) []string {
+func drawImage(paragraphs []string, style Style, metadata sdk.ProfileMetadata, date string) (image.Image, error) {
-	lines := make([]string, 0, MAX_LINES)
-	l := 0 // global line counter
-
-	for _, block := range input {
-		block := strings.TrimRight(block, "\n")
-		quoting := false
-		maxChars := MAX_CHARS_PER_LINE
-		if strings.HasPrefix(block, BLOCK+" ") {
-			quoting = true
-			maxChars = MAX_CHARS_PER_QUOTE_LINE // on quote lines we tolerate less characters
-			block = block[len(BLOCK)+1:]
-			lines = append(lines, "") // add an empty line before each quote
-			l++
-		}
-		for _, line := range strings.Split(block, "\n") {
-			if l == MAX_LINES {
-				// escape and return here if we're over max lines
-				return lines
-			}
-
-			// turn a single line into multiple if it is long enough -- carefully splitting on word ends
-			wrappedLines := strings.Split(wordwrap.Wrap(maxChars, strings.TrimSpace(line)), "\n")
-
-			// now we go over all these lines and further split them if necessary
-			// in japanese, for example, we must break the words otherwise nothing works
-			var sublines []string
-			if breakWords {
-				sublines = make([]string, 0, len(wrappedLines))
-				for _, wline := range wrappedLines {
-					// split until we have a bunch of lines all under maxChars
-					for {
-						if len(wline) > maxChars {
-							// we can't split exactly at maxChars because that would break utf-8 runes
-							// so we do this range mess to try to grab where the last rune in the line ends
-							subline := make([]rune, 0, maxChars)
-							var i int
-							var r rune
-							for i, r = range wline {
-								if i > maxChars {
-									break
-								}
-								subline = append(subline, r)
-							}
-							sublines = append(sublines, string(subline))
-							wline = wline[i:]
-						} else {
-							sublines = append(sublines, wline)
-							break
-						}
-					}
-				}
-			} else {
-				sublines = wrappedLines
-			}
-
-			for _, subline := range sublines {
-				// if a line has a word so big that it would overflow (like a nevent), hide it with an ellipsis
-				if len([]rune(subline)) > maxChars {
-					subline = subline[0:maxChars-1] + "…"
-				}
-
-				if quoting {
-					subline = BLOCK + " " + subline
-				}
-
-				lines = append(lines, subline)
-				l++
-			}
-		}
-	}
-	return lines
-}
-
-func fetchImageFromURL(url string) (image.Image, error) {
-	response, err := http.Get(url)
-	if err != nil {
-		return nil, err
-	}
-	defer response.Body.Close()
-
-	img, _, err := image.Decode(response.Body)
-	if err != nil {
-		return nil, err
-	}
-
-	return img, nil
-}
-
-func roundImage(img image.Image) image.Image {
-	bounds := img.Bounds()
-	diameter := math.Min(float64(bounds.Dx()), float64(bounds.Dy()))
-	radius := diameter / 2
-
-	// Create a new context for the mask
-	mask := gg.NewContext(bounds.Dx(), bounds.Dy())
-	mask.SetColor(color.Black) // Set the mask color to fully opaque
-	mask.DrawCircle(float64(bounds.Dx())/2, float64(bounds.Dy())/2, radius)
-	mask.ClosePath()
-	mask.Fill()
-
-	// Apply the circular mask to the original image
-	result := image.NewRGBA(bounds)
-	maskImg := mask.Image()
-	draw.DrawMask(result, bounds, img, image.Point{}, maskImg, image.Point{}, draw.Over)
-
-	return result
-}
-
-func cropToSquare(img image.Image) image.Image {
-	bounds := img.Bounds()
-	size := int(math.Min(float64(bounds.Dx()), float64(bounds.Dy())))
-	squareImg := image.NewRGBA(image.Rect(0, 0, size, size))
-	for x := 0; x < size; x++ {
-		for y := 0; y < size; y++ {
-			squareImg.Set(x, y, img.At(x+(bounds.Dx()-size)/2, y+(bounds.Dy()-size)/2))
-		}
-	}
-	return squareImg
-}
-
-func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.ProfileMetadata, date string) (image.Image, error) {
 	width := 700
 	height := 525
 	paddingLeft := 25
-	barExtraPadding := 5
+	barExtraPadding := 0
+	gradientRectHeight := 140
 	switch style {
 	case StyleTelegram:
 		paddingLeft += 10
@@ -233,28 +100,28 @@ func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.Pro
 	img.SetColor(BACKGROUND)
 	img.Clear()
 	img.SetColor(FOREGROUND)
+
+	// main content text
+	textImg := drawText(paragraphs, width-paddingLeft*2, height-20, true)
+	img.DrawImage(textImg, paddingLeft, 20)
+
+	// font for writing the bottom bar stuff
+	fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf")
+	ttf, _ := truetype.Parse(fontData)
 	img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
-		Size:    FONT_SIZE,
+		Size:    6,
-		DPI:     FONT_DPI,
+		DPI:     260,
-		Hinting: font.HintingFull,
+		Hinting: xfont.HintingFull,
 	}))
 
-	// Draw note text
+	// black bar at the bottom
-	lineSpacing := 0.3
-	lineHeight := float64(FONT_SIZE)*FONT_DPI/72.0 + float64(FONT_SIZE)*lineSpacing*FONT_DPI/72.0
-	for i, line := range lines {
-		y := float64(i)*lineHeight + 50               // Calculate the Y position for each line
-		img.DrawString(line, float64(paddingLeft), y) // Draw the line at the calculated Y position
-	}
-
-	// Draw black bar at the bottom
 	barHeight := 70
 	img.SetColor(BAR_BACKGROUND)
 	img.DrawRectangle(0, float64(height-barHeight), float64(width), float64(barHeight))
 	img.Fill()
 
-	// Create a rectangle at the bottom with a gradient from black to transparent
+	// a rectangle at the bottom with a gradient from black to transparent
-	gradientRectHeight := 140
+	if len(strings.Join(paragraphs, "\n")) > 141 {
 		gradientRectY := height - barHeight - gradientRectHeight
 		for y := 0; y < gradientRectHeight; y++ {
 			alpha := uint8(255 * (math.Pow(float64(y)/float64(gradientRectHeight), 2)))
@@ -262,8 +129,9 @@ func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.Pro
 			img.DrawRectangle(0, float64(gradientRectY+y), float64(width), 1)
 			img.Fill()
 		}
+	}
 
-	// Draw author's image from URL
+	// draw author's name
 	authorTextX := paddingLeft + barExtraPadding
 	if metadata.Picture != "" {
 		authorImage, err := fetchImageFromURL(metadata.Picture)
@@ -273,14 +141,13 @@ func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.Pro
 			authorTextX += 65
 		}
 	}
-
+	authorTextY := height - barHeight + 15
-	// Draw author's name
-	authorTextY := height - barHeight + 20
 	authorMaxWidth := width/2.0 - paddingLeft*2 - barExtraPadding
 	img.SetColor(color.White)
-	img.DrawStringWrapped(metadata.ShortName(), float64(authorTextX), float64(authorTextY), 0, 0, float64(width*99), 99, gg.AlignLeft)
+	textImg = drawText([]string{metadata.ShortName()}, width, barHeight, false)
+	img.DrawImage(textImg, authorTextX, authorTextY)
 
-	// Create a gradient to cover too long names
+	// a gradient to cover too long names
 	img.SetColor(BAR_BACKGROUND)
 	img.DrawRectangle(float64(authorTextX+authorMaxWidth), float64(height-barHeight), float64(width-authorTextX-authorMaxWidth), float64(barHeight))
 	gradientLenght := 60
@@ -291,7 +158,7 @@ func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.Pro
 		img.Fill()
 	}
 
-	// Draw the logo
+	// bottom bar logo
 	logo, _ := static.ReadFile("static/logo.png")
 	stampImg, _ := png.Decode(bytes.NewBuffer(logo))
 	stampWidth := stampImg.Bounds().Dx()
@@ -304,145 +171,70 @@ func drawImage(lines []string, ttf *truetype.Font, style Style, metadata sdk.Pro
 	layout := "2006-01-02 15:04:05"
 	parsedTime, _ := time.Parse(layout, date)
 	formattedDate := parsedTime.Format("Jan 02, 2006")
-	img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
-		Size:    FONT_SIZE - 1,
-		DPI:     FONT_DPI,
-		Hinting: font.HintingFull,
-	}))
 	img.SetColor(color.RGBA{160, 160, 160, 255})
-	img.DrawStringWrapped(formattedDate, float64(width-paddingLeft-stampWidth-260), float64(authorTextY+3), 0, 0, float64(240), 1.5, gg.AlignRight)
+	img.DrawStringWrapped(formattedDate, float64(width-paddingLeft-stampWidth-260), float64(height-barHeight+22), 0, 0, float64(240), 1.5, gg.AlignRight)
 
 	return img.Image(), nil
 }
 
-// replace nevent and note with their text, as an extra line prefixed by BLOCK
+func drawText(paragraphs []string, width, height int, dynamicResize bool) image.Image {
-// this returns a slice of lines
+	FONT_SIZE := 25
-func renderQuotesAsBlockPrefixedText(ctx context.Context, input string) []string {
+	color := color.RGBA{R: 255, G: 230, B: 238, A: 255}
-	ctx, cancel := context.WithTimeout(ctx, time.Second*3)
+	img := image.NewNRGBA(image.Rect(0, 0, width, height))
-	defer cancel()
 
-	blocks := make([]string, 0, 8)
+	joinedContent := strings.Join(paragraphs, "\n")
-	matches := nostrNoteNeventMatcher.FindAllStringSubmatchIndex(input, -1)
+	if dynamicResize && len(joinedContent) < 141 {
-
+		FONT_SIZE = 7
-	if len(matches) == 0 {
+		img := gg.NewContext(width, height)
-		// no matches, just return text as it is
+		fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf")
-		blocks = append(blocks, input)
+		ttf, _ := truetype.Parse(fontData)
-		return blocks
+		i := 1
+		lineSpacing := 1.2
+		for i < 20 {
+			FONT_SIZE += i
+			img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
+				Size: float64(FONT_SIZE),
+				DPI:  260,
+			}))
+			wrappedContent := strings.Join(img.WordWrap(joinedContent, float64(width-120)), "\n")
+			_, checkHeight := img.MeasureMultilineString(wrappedContent, lineSpacing)
+			if checkHeight > float64(height-70-60*2) {
+				FONT_SIZE -= 1
+				break
+			}
+			i += 1
+		}
+		FONT_SIZE = FONT_SIZE*4 - 2
 	}
 
-	// one or more matches, return multiple lines
+	lineNumber := 1
-	blocks = append(blocks, input[0:matches[0][0]])
+	for _, paragraph := range paragraphs {
-	i := -1 // matches iteration counter
+		rawText := []rune(paragraph)
-	b := 0  // current block index
-	for _, match := range matches {
-		i++
 
-		matchText := input[match[0]:match[1]]
+		shapedRunes, emojiMask := shapeText(rawText, FONT_SIZE)
-		submatch := nostrNoteNeventMatcher.FindStringSubmatch(matchText)
-		nip19 := submatch[0][6:]
 
-		event, _, err := getEvent(ctx, nip19, nil)
+		var wrapper shaping.LineWrapper
-		if err != nil {
+		it := shaping.NewSliceIterator([]shaping.Output{shapedRunes})
-			// error case concat this to previous block
+		lines, _ := wrapper.WrapParagraph(shaping.WrapConfig{}, width, rawText, it)
-			blocks[b] += matchText
+
-			continue
+		totalCharsWritten := 0
+		for _, line := range lines {
+			for _, out := range line {
+				charsWritten, _ := drawShapedRunAt(
+					img,
+					FONT_SIZE,
+					color,
+					out,
+					emojiMask,
+					totalCharsWritten,
+					0,
+					FONT_SIZE*lineNumber*12/10,
+				)
+				totalCharsWritten += charsWritten
+				lineNumber++
+			}
+		}
 	}
 
-		// add a new block with the quoted text
+	return img
-		blocks = append(blocks, BLOCK+" "+event.Content)
-
-		// increase block count
-		b++
-	}
-	// add remaining text after the last match
-	remainingText := input[matches[i][1]:]
-	if strings.TrimSpace(remainingText) != "" {
-		blocks = append(blocks, remainingText)
-	}
-
-	return blocks
-}
-
-func getLanguage(text string) (*truetype.Font, bool, error) {
-	fontName := "fonts/NotoSans.ttf"
-	shouldBreakWords := false
-
-	for _, group := range []struct {
-		lang       *unicode.RangeTable
-		fontName   string
-		breakWords bool
-	}{
-		{
-			unicode.Han,
-			"fonts/NotoSansSC.ttf",
-			true,
-		},
-		{
-			unicode.Katakana,
-			"fonts/NotoSansJP.ttf",
-			true,
-		},
-		{
-			unicode.Hiragana,
-			"fonts/NotoSansJP.ttf",
-			true,
-		},
-		{
-			unicode.Hangul,
-			"fonts/NotoSansKR.ttf",
-			true,
-		},
-		{
-			unicode.Arabic,
-			"fonts/NotoSansArabic.ttf",
-			false,
-		},
-		{
-			unicode.Hebrew,
-			"fonts/NotoSansHebrew.ttf",
-			false,
-		},
-		{
-			unicode.Bengali,
-			"fonts/NotoSansBengali.ttf",
-			false,
-		},
-		{
-			unicode.Thai,
-			"fonts/NotoSansThai.ttf",
-			false,
-		},
-	} {
-		for _, rune := range text {
-			rune16 := uint16(rune)
-			for _, r16 := range group.lang.R16 {
-				if rune16 >= r16.Lo && rune16 <= r16.Hi {
-					fontName = group.fontName
-					shouldBreakWords = group.breakWords
-					goto gotLang
-				}
-			}
-			rune32 := uint32(rune)
-			for _, r32 := range group.lang.R32 {
-				if rune32 >= r32.Lo && rune32 <= r32.Hi {
-					fontName = group.fontName
-					shouldBreakWords = group.breakWords
-					goto gotLang
-				}
-			}
-		}
-	}
-
-gotLang:
-	fontData, err := fonts.ReadFile(fontName)
-	if err != nil {
-		return nil, false, err
-	}
-
-	font, err := truetype.Parse(fontData)
-	if err != nil {
-		return nil, false, err
-	}
-
-	return font, shouldBreakWords, nil
 }

samples.txt

@@ -10,3 +10,6 @@ naddr1qqwyummnw3ez64r9vd5z64m9v44kc7fdxgcryvedxycj6vfeqgszak7w562dzerznp222fvrgk
 nevent1qqsy05v33j3w6klkfhy6taud0d7g7n6e7z9mt0z20aenqfam3lzywrcpzpmhxue69uhnzdps9enrw73wd9hsyg9vxs9ql7jgtz0f3tu9wa65220gck0hl5gs7x7gxtgw34xy60gc2vg30mg0
 nevent1qqszl72lntw6qdx2dc0fet9yrjpxlvh98ww7w3egm5ey5h0dwwzjg2gpzpmhxue69uhnzdps9enrw73wd9hsygyxl5wgpsraaw7r6xffxaajf49lvk594ung4u2umg4veez5manshc4w8pdp
 nevent1qqsyxahlr82z786vyhg0u2ycx46wrwwz5tap66udeffxle7phduthmspzpmhxue69uhnzdps9enrw73wd9hsygpcrk7vwyuw4wd8r6q5c4ur0jwky06qxmkqys80xq3nq6z0lj9n3u9zd3r4
+nevent1qqstj4gq2q9utuazaagzx0cd0n3jlm97p2084rfrvw2f8ytfa8ec2qgpp4mhxue69uhhjctzw5hx6egzypmezxyxju0727078e8epkwu06gle46g2rwzs5mgrll3we2tyxqfzuwew5q
+nevent1qqs9jhjm7cy3gtwlw3zvgrcras8nkvjs8gz0cvnmepmed4k92z8uxgspzpmhxue69uhkummnw3ezuamfdejsygy0mgsen3pen7khlaqjddqz7867u9tlm0jvp9g7vn07xx4wepml7yux7e7e
+nevent1qqsq9kxxrsmck2sj5gdu04llcjku5ex65eqyu5ec4a9nyr4ymudezegpp4mhxue69uhkummn9ekx7mqppamhxue69uhkummnw3ezumt0d5q3gamnwvaz7tmwdaehgu3wdau8gu3wv3jhvqgcwaehxw309ac82cnvd93juun9d3shj6twvuhxjmcpz3mhxue69uhhyetvv9ujumn0wd68ytnzvuq3samnwvaz7tmjv4kxz7fwdehhxamgv4ex2tnrdaksygqzm86kwmllcvull62dl2ech6lzrns303h32zwejg4g94z57ssd5gukzwe4

utils.go

@@ -504,3 +504,26 @@ func isntRealRelay(url string) bool {
 	substr := []byte(url[6:])
 	return bytes.IndexByte(substr, '/') != -1
 }
+
+func maxIndex(slice []int) int {
+	maxIndex := -1
+	maxVal := 0
+	for i, val := range slice {
+		if val > maxVal {
+			maxVal = val
+			maxIndex = i
+		}
+	}
+	return maxIndex
+}
+
+// clamp ensures val is in the inclusive range [low,high].
+func clamp(val, low, high int) int {
+	if val < low {
+		return low
+	}
+	if val > high {
+		return high
+	}
+	return val
+}