appview/repo/ogcard: package to help draw image cards

+500

appview/repo/ogcard/card.go

··· 1 + // Copyright 2024 The Forgejo Authors. All rights reserved. 2 + // Copyright 2025 The Tangled Authors -- repurposed for Tangled use. 3 + // SPDX-License-Identifier: MIT 4 + 5 + package ogcard 6 + 7 + import ( 8 + "bytes" 9 + "fmt" 10 + "image" 11 + "image/color" 12 + "io" 13 + "log" 14 + "math" 15 + "net/http" 16 + "strings" 17 + "sync" 18 + "time" 19 + 20 + "github.com/goki/freetype" 21 + "github.com/goki/freetype/truetype" 22 + "github.com/srwiley/oksvg" 23 + "github.com/srwiley/rasterx" 24 + "golang.org/x/image/draw" 25 + "golang.org/x/image/font" 26 + "tangled.org/core/appview/pages" 27 + 28 + _ "golang.org/x/image/webp" // for processing webp images 29 + ) 30 + 31 + type Card struct { 32 + Img *image.RGBA 33 + Font *truetype.Font 34 + Margin int 35 + Width int 36 + Height int 37 + } 38 + 39 + var fontCache = sync.OnceValues(func() (*truetype.Font, error) { 40 + interVar, err := pages.Files.ReadFile("static/fonts/InterVariable.ttf") 41 + if err != nil { 42 + return nil, err 43 + } 44 + return truetype.Parse(interVar) 45 + }) 46 + 47 + // DefaultSize returns the default size for a card 48 + func DefaultSize() (int, int) { 49 + return 1200, 600 50 + } 51 + 52 + // NewCard creates a new card with the given dimensions in pixels 53 + func NewCard(width, height int) (*Card, error) { 54 + img := image.NewRGBA(image.Rect(0, 0, width, height)) 55 + draw.Draw(img, img.Bounds(), image.NewUniform(color.White), image.Point{}, draw.Src) 56 + 57 + font, err := fontCache() 58 + if err != nil { 59 + return nil, err 60 + } 61 + 62 + return &Card{ 63 + Img: img, 64 + Font: font, 65 + Margin: 0, 66 + Width: width, 67 + Height: height, 68 + }, nil 69 + } 70 + 71 + // Split splits the card horizontally or vertically by a given percentage; the first card returned has the percentage 72 + // size, and the second card has the remainder. Both cards draw to a subsection of the same image buffer. 73 + func (c *Card) Split(vertical bool, percentage int) (*Card, *Card) { 74 + bounds := c.Img.Bounds() 75 + bounds = image.Rect(bounds.Min.X+c.Margin, bounds.Min.Y+c.Margin, bounds.Max.X-c.Margin, bounds.Max.Y-c.Margin) 76 + if vertical { 77 + mid := (bounds.Dx() * percentage / 100) + bounds.Min.X 78 + subleft := c.Img.SubImage(image.Rect(bounds.Min.X, bounds.Min.Y, mid, bounds.Max.Y)).(*image.RGBA) 79 + subright := c.Img.SubImage(image.Rect(mid, bounds.Min.Y, bounds.Max.X, bounds.Max.Y)).(*image.RGBA) 80 + return &Card{Img: subleft, Font: c.Font, Width: subleft.Bounds().Dx(), Height: subleft.Bounds().Dy()}, 81 + &Card{Img: subright, Font: c.Font, Width: subright.Bounds().Dx(), Height: subright.Bounds().Dy()} 82 + } 83 + mid := (bounds.Dy() * percentage / 100) + bounds.Min.Y 84 + subtop := c.Img.SubImage(image.Rect(bounds.Min.X, bounds.Min.Y, bounds.Max.X, mid)).(*image.RGBA) 85 + subbottom := c.Img.SubImage(image.Rect(bounds.Min.X, mid, bounds.Max.X, bounds.Max.Y)).(*image.RGBA) 86 + return &Card{Img: subtop, Font: c.Font, Width: subtop.Bounds().Dx(), Height: subtop.Bounds().Dy()}, 87 + &Card{Img: subbottom, Font: c.Font, Width: subbottom.Bounds().Dx(), Height: subbottom.Bounds().Dy()} 88 + } 89 + 90 + // SetMargin sets the margins for the card 91 + func (c *Card) SetMargin(margin int) { 92 + c.Margin = margin 93 + } 94 + 95 + type ( 96 + VAlign int64 97 + HAlign int64 98 + ) 99 + 100 + const ( 101 + Top VAlign = iota 102 + Middle 103 + Bottom 104 + ) 105 + 106 + const ( 107 + Left HAlign = iota 108 + Center 109 + Right 110 + ) 111 + 112 + // DrawText draws text within the card, respecting margins and alignment 113 + func (c *Card) DrawText(text string, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) ([]string, error) { 114 + ft := freetype.NewContext() 115 + ft.SetDPI(72) 116 + ft.SetFont(c.Font) 117 + ft.SetFontSize(sizePt) 118 + ft.SetClip(c.Img.Bounds()) 119 + ft.SetDst(c.Img) 120 + ft.SetSrc(image.NewUniform(textColor)) 121 + 122 + face := truetype.NewFace(c.Font, &truetype.Options{Size: sizePt, DPI: 72}) 123 + fontHeight := ft.PointToFixed(sizePt).Ceil() 124 + 125 + bounds := c.Img.Bounds() 126 + bounds = image.Rect(bounds.Min.X+c.Margin, bounds.Min.Y+c.Margin, bounds.Max.X-c.Margin, bounds.Max.Y-c.Margin) 127 + boxWidth, boxHeight := bounds.Size().X, bounds.Size().Y 128 + // draw.Draw(c.Img, bounds, image.NewUniform(color.Gray{128}), image.Point{}, draw.Src) // Debug draw box 129 + 130 + // Try to apply wrapping to this text; we'll find the most text that will fit into one line, record that line, move 131 + // on. We precalculate each line before drawing so that we can support valign="middle" correctly which requires 132 + // knowing the total height, which is related to how many lines we'll have. 133 + lines := make([]string, 0) 134 + textWords := strings.Split(text, " ") 135 + currentLine := "" 136 + heightTotal := 0 137 + 138 + for { 139 + if len(textWords) == 0 { 140 + // Ran out of words. 141 + if currentLine != "" { 142 + heightTotal += fontHeight 143 + lines = append(lines, currentLine) 144 + } 145 + break 146 + } 147 + 148 + nextWord := textWords[0] 149 + proposedLine := currentLine 150 + if proposedLine != "" { 151 + proposedLine += " " 152 + } 153 + proposedLine += nextWord 154 + 155 + proposedLineWidth := font.MeasureString(face, proposedLine) 156 + if proposedLineWidth.Ceil() > boxWidth { 157 + // no, proposed line is too big; we'll use the last "currentLine" 158 + heightTotal += fontHeight 159 + if currentLine != "" { 160 + lines = append(lines, currentLine) 161 + currentLine = "" 162 + // leave nextWord in textWords and keep going 163 + } else { 164 + // just nextWord by itself doesn't fit on a line; well, we can't skip it, but we'll consume it 165 + // regardless as a line by itself. It will be clipped by the drawing routine. 166 + lines = append(lines, nextWord) 167 + textWords = textWords[1:] 168 + } 169 + } else { 170 + // yes, it will fit 171 + currentLine = proposedLine 172 + textWords = textWords[1:] 173 + } 174 + } 175 + 176 + textY := 0 177 + switch valign { 178 + case Top: 179 + textY = fontHeight 180 + case Bottom: 181 + textY = boxHeight - heightTotal + fontHeight 182 + case Middle: 183 + textY = ((boxHeight - heightTotal) / 2) + fontHeight 184 + } 185 + 186 + for _, line := range lines { 187 + lineWidth := font.MeasureString(face, line) 188 + 189 + textX := 0 190 + switch halign { 191 + case Left: 192 + textX = 0 193 + case Right: 194 + textX = boxWidth - lineWidth.Ceil() 195 + case Center: 196 + textX = (boxWidth - lineWidth.Ceil()) / 2 197 + } 198 + 199 + pt := freetype.Pt(bounds.Min.X+textX, bounds.Min.Y+textY) 200 + _, err := ft.DrawString(line, pt) 201 + if err != nil { 202 + return nil, err 203 + } 204 + 205 + textY += fontHeight 206 + } 207 + 208 + return lines, nil 209 + } 210 + 211 + // DrawTextAt draws text at a specific position with the given alignment 212 + func (c *Card) DrawTextAt(text string, x, y int, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) error { 213 + _, err := c.DrawTextAtWithWidth(text, x, y, textColor, sizePt, valign, halign) 214 + return err 215 + } 216 + 217 + // DrawTextAtWithWidth draws text at a specific position and returns the text width 218 + func (c *Card) DrawTextAtWithWidth(text string, x, y int, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) (int, error) { 219 + ft := freetype.NewContext() 220 + ft.SetDPI(72) 221 + ft.SetFont(c.Font) 222 + ft.SetFontSize(sizePt) 223 + ft.SetClip(c.Img.Bounds()) 224 + ft.SetDst(c.Img) 225 + ft.SetSrc(image.NewUniform(textColor)) 226 + 227 + face := truetype.NewFace(c.Font, &truetype.Options{Size: sizePt, DPI: 72}) 228 + fontHeight := ft.PointToFixed(sizePt).Ceil() 229 + lineWidth := font.MeasureString(face, text) 230 + textWidth := lineWidth.Ceil() 231 + 232 + // Adjust position based on alignment 233 + adjustedX := x 234 + adjustedY := y 235 + 236 + switch halign { 237 + case Left: 238 + // x is already at the left position 239 + case Right: 240 + adjustedX = x - textWidth 241 + case Center: 242 + adjustedX = x - textWidth/2 243 + } 244 + 245 + switch valign { 246 + case Top: 247 + adjustedY = y + fontHeight 248 + case Bottom: 249 + adjustedY = y 250 + case Middle: 251 + adjustedY = y + fontHeight/2 252 + } 253 + 254 + pt := freetype.Pt(adjustedX, adjustedY) 255 + _, err := ft.DrawString(text, pt) 256 + return textWidth, err 257 + } 258 + 259 + // DrawBoldText draws bold text by rendering multiple times with slight offsets 260 + func (c *Card) DrawBoldText(text string, x, y int, textColor color.Color, sizePt float64, valign VAlign, halign HAlign) (int, error) { 261 + // Draw the text multiple times with slight offsets to create bold effect 262 + offsets := []struct{ dx, dy int }{ 263 + {0, 0}, // original 264 + {1, 0}, // right 265 + {0, 1}, // down 266 + {1, 1}, // diagonal 267 + } 268 + 269 + var width int 270 + for _, offset := range offsets { 271 + w, err := c.DrawTextAtWithWidth(text, x+offset.dx, y+offset.dy, textColor, sizePt, valign, halign) 272 + if err != nil { 273 + return 0, err 274 + } 275 + if width == 0 { 276 + width = w 277 + } 278 + } 279 + return width, nil 280 + } 281 + 282 + // DrawSVGIcon draws an SVG icon from the embedded files at the specified position 283 + func (c *Card) DrawSVGIcon(svgPath string, x, y, size int, iconColor color.Color) error { 284 + svgData, err := pages.Files.ReadFile(svgPath) 285 + if err != nil { 286 + return fmt.Errorf("failed to read SVG file %s: %w", svgPath, err) 287 + } 288 + 289 + // Convert color to hex string for SVG 290 + rgba, isRGBA := iconColor.(color.RGBA) 291 + if !isRGBA { 292 + r, g, b, a := iconColor.RGBA() 293 + rgba = color.RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)} 294 + } 295 + colorHex := fmt.Sprintf("#%02x%02x%02x", rgba.R, rgba.G, rgba.B) 296 + 297 + // Replace currentColor with our desired color in the SVG 298 + svgString := string(svgData) 299 + svgString = strings.ReplaceAll(svgString, "currentColor", colorHex) 300 + 301 + // Make the stroke thicker 302 + svgString = strings.ReplaceAll(svgString, `stroke-width="2"`, `stroke-width="3"`) 303 + 304 + // Parse SVG 305 + icon, err := oksvg.ReadIconStream(strings.NewReader(svgString)) 306 + if err != nil { 307 + return fmt.Errorf("failed to parse SVG %s: %w", svgPath, err) 308 + } 309 + 310 + // Set the icon size 311 + w, h := float64(size), float64(size) 312 + icon.SetTarget(0, 0, w, h) 313 + 314 + // Create a temporary RGBA image for the icon 315 + iconImg := image.NewRGBA(image.Rect(0, 0, size, size)) 316 + 317 + // Create scanner and rasterizer 318 + scanner := rasterx.NewScannerGV(size, size, iconImg, iconImg.Bounds()) 319 + raster := rasterx.NewDasher(size, size, scanner) 320 + 321 + // Draw the icon 322 + icon.Draw(raster, 1.0) 323 + 324 + // Draw the icon onto the card at the specified position 325 + bounds := c.Img.Bounds() 326 + destRect := image.Rect(x, y, x+size, y+size) 327 + 328 + // Make sure we don't draw outside the card bounds 329 + if destRect.Max.X > bounds.Max.X { 330 + destRect.Max.X = bounds.Max.X 331 + } 332 + if destRect.Max.Y > bounds.Max.Y { 333 + destRect.Max.Y = bounds.Max.Y 334 + } 335 + 336 + draw.Draw(c.Img, destRect, iconImg, image.Point{}, draw.Over) 337 + 338 + return nil 339 + } 340 + 341 + // DrawImage fills the card with an image, scaled to maintain the original aspect ratio and centered with respect to the non-filled dimension 342 + func (c *Card) DrawImage(img image.Image) { 343 + bounds := c.Img.Bounds() 344 + targetRect := image.Rect(bounds.Min.X+c.Margin, bounds.Min.Y+c.Margin, bounds.Max.X-c.Margin, bounds.Max.Y-c.Margin) 345 + srcBounds := img.Bounds() 346 + srcAspect := float64(srcBounds.Dx()) / float64(srcBounds.Dy()) 347 + targetAspect := float64(targetRect.Dx()) / float64(targetRect.Dy()) 348 + 349 + var scale float64 350 + if srcAspect > targetAspect { 351 + // Image is wider than target, scale by width 352 + scale = float64(targetRect.Dx()) / float64(srcBounds.Dx()) 353 + } else { 354 + // Image is taller or equal, scale by height 355 + scale = float64(targetRect.Dy()) / float64(srcBounds.Dy()) 356 + } 357 + 358 + newWidth := int(math.Round(float64(srcBounds.Dx()) * scale)) 359 + newHeight := int(math.Round(float64(srcBounds.Dy()) * scale)) 360 + 361 + // Center the image within the target rectangle 362 + offsetX := (targetRect.Dx() - newWidth) / 2 363 + offsetY := (targetRect.Dy() - newHeight) / 2 364 + 365 + scaledRect := image.Rect(targetRect.Min.X+offsetX, targetRect.Min.Y+offsetY, targetRect.Min.X+offsetX+newWidth, targetRect.Min.Y+offsetY+newHeight) 366 + draw.CatmullRom.Scale(c.Img, scaledRect, img, srcBounds, draw.Over, nil) 367 + } 368 + 369 + func fallbackImage() image.Image { 370 + // can't usage image.Uniform(color.White) because it's infinitely sized causing a panic in the scaler in DrawImage 371 + img := image.NewRGBA(image.Rect(0, 0, 1, 1)) 372 + img.Set(0, 0, color.White) 373 + return img 374 + } 375 + 376 + // As defensively as possible, attempt to load an image from a presumed external and untrusted URL 377 + func (c *Card) fetchExternalImage(url string) (image.Image, bool) { 378 + // Use a short timeout; in the event of any failure we'll be logging and returning a placeholder, but we don't want 379 + // this rendering process to be slowed down 380 + client := &http.Client{ 381 + Timeout: 1 * time.Second, // 1 second timeout 382 + } 383 + 384 + resp, err := client.Get(url) 385 + if err != nil { 386 + log.Printf("error when fetching external image from %s: %v", url, err) 387 + return nil, false 388 + } 389 + defer resp.Body.Close() 390 + 391 + if resp.StatusCode != http.StatusOK { 392 + log.Printf("non-OK error code when fetching external image from %s: %s", url, resp.Status) 393 + return nil, false 394 + } 395 + 396 + contentType := resp.Header.Get("Content-Type") 397 + // Support content types are in-sync with the allowed custom avatar file types 398 + if contentType != "image/png" && contentType != "image/jpeg" && contentType != "image/gif" && contentType != "image/webp" { 399 + log.Printf("fetching external image returned unsupported Content-Type which was ignored: %s", contentType) 400 + return nil, false 401 + } 402 + 403 + body := resp.Body 404 + bodyBytes, err := io.ReadAll(body) 405 + if err != nil { 406 + log.Printf("error when fetching external image from %s: %v", url, err) 407 + return nil, false 408 + } 409 + 410 + bodyBuffer := bytes.NewReader(bodyBytes) 411 + _, imgType, err := image.DecodeConfig(bodyBuffer) 412 + if err != nil { 413 + log.Printf("error when decoding external image from %s: %v", url, err) 414 + return nil, false 415 + } 416 + 417 + // Verify that we have a match between actual data understood in the image body and the reported Content-Type 418 + if (contentType == "image/png" && imgType != "png") || 419 + (contentType == "image/jpeg" && imgType != "jpeg") || 420 + (contentType == "image/gif" && imgType != "gif") || 421 + (contentType == "image/webp" && imgType != "webp") { 422 + log.Printf("while fetching external image, mismatched image body (%s) and Content-Type (%s)", imgType, contentType) 423 + return nil, false 424 + } 425 + 426 + _, err = bodyBuffer.Seek(0, io.SeekStart) // reset for actual decode 427 + if err != nil { 428 + log.Printf("error w/ bodyBuffer.Seek") 429 + return nil, false 430 + } 431 + img, _, err := image.Decode(bodyBuffer) 432 + if err != nil { 433 + log.Printf("error when decoding external image from %s: %v", url, err) 434 + return nil, false 435 + } 436 + 437 + return img, true 438 + } 439 + 440 + func (c *Card) DrawExternalImage(url string) { 441 + image, ok := c.fetchExternalImage(url) 442 + if !ok { 443 + image = fallbackImage() 444 + } 445 + c.DrawImage(image) 446 + } 447 + 448 + // DrawCircularExternalImage draws an external image as a circle at the specified position 449 + func (c *Card) DrawCircularExternalImage(url string, x, y, size int) error { 450 + img, ok := c.fetchExternalImage(url) 451 + if !ok { 452 + img = fallbackImage() 453 + } 454 + 455 + // Create a circular mask 456 + circle := image.NewRGBA(image.Rect(0, 0, size, size)) 457 + center := size / 2 458 + radius := float64(size / 2) 459 + 460 + // Scale the source image to fit the circle 461 + srcBounds := img.Bounds() 462 + scaledImg := image.NewRGBA(image.Rect(0, 0, size, size)) 463 + draw.CatmullRom.Scale(scaledImg, scaledImg.Bounds(), img, srcBounds, draw.Src, nil) 464 + 465 + // Draw the image with circular clipping 466 + for cy := 0; cy < size; cy++ { 467 + for cx := 0; cx < size; cx++ { 468 + // Calculate distance from center 469 + dx := float64(cx - center) 470 + dy := float64(cy - center) 471 + distance := math.Sqrt(dx*dx + dy*dy) 472 + 473 + // Only draw pixels within the circle 474 + if distance <= radius { 475 + circle.Set(cx, cy, scaledImg.At(cx, cy)) 476 + } 477 + } 478 + } 479 + 480 + // Draw the circle onto the card 481 + bounds := c.Img.Bounds() 482 + destRect := image.Rect(x, y, x+size, y+size) 483 + 484 + // Make sure we don't draw outside the card bounds 485 + if destRect.Max.X > bounds.Max.X { 486 + destRect.Max.X = bounds.Max.X 487 + } 488 + if destRect.Max.Y > bounds.Max.Y { 489 + destRect.Max.Y = bounds.Max.Y 490 + } 491 + 492 + draw.Draw(c.Img, destRect, circle, image.Point{}, draw.Over) 493 + 494 + return nil 495 + } 496 + 497 + // DrawRect draws a rect with the given color 498 + func (c *Card) DrawRect(startX, startY, endX, endY int, color color.Color) { 499 + draw.Draw(c.Img, image.Rect(startX, startY, endX, endY), &image.Uniform{color}, image.Point{}, draw.Src) 500 + }

+4 -3

go.mod

··· 21 21 github.com/go-chi/chi/v5 v5.2.0 22 22 github.com/go-enry/go-enry/v2 v2.9.2 23 23 github.com/go-git/go-git/v5 v5.14.0 24 + github.com/goki/freetype v1.0.5 24 25 github.com/google/uuid v1.6.0 25 26 github.com/gorilla/feeds v1.2.0 26 27 github.com/gorilla/sessions v1.4.0 ··· 44 45 github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc 45 46 golang.org/x/crypto v0.40.0 46 47 golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b 48 + golang.org/x/image v0.31.0 47 49 golang.org/x/net v0.42.0 48 - golang.org/x/sync v0.16.0 50 + golang.org/x/sync v0.17.0 49 51 golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da 50 52 gopkg.in/yaml.v3 v3.0.1 51 - tangled.org/anirudh.fi/atproto-oauth v0.0.0-20251004062652-69f4561572b5 52 53 ) 53 54 54 55 require ( ··· 170 171 go.uber.org/multierr v1.11.0 // indirect 171 172 go.uber.org/zap v1.27.0 // indirect 172 173 golang.org/x/sys v0.34.0 // indirect 173 - golang.org/x/text v0.27.0 // indirect 174 + golang.org/x/text v0.29.0 // indirect 174 175 golang.org/x/time v0.12.0 // indirect 175 176 google.golang.org/genproto/googleapis/api v0.0.0-20250603155806-513f23925822 // indirect 176 177 google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect

+6 -10

go.sum

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