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If provided, reuses/replaces existing image with this ID. */\n\timageId?: number;\n\t/** Whether Kitty should apply its default cursor movement after placement. */\n\tmoveCursor?: boolean;\n}\n\nlet cachedCapabilities: TerminalCapabilities | null = null;\n\n// Default cell dimensions - updated by TUI when terminal responds to query\nlet cellDimensions: CellDimensions = { widthPx: 9, heightPx: 18 };\n\nexport function getCellDimensions(): CellDimensions {\n\treturn cellDimensions;\n}\n\nexport function setCellDimensions(dims: CellDimensions): void {\n\tcellDimensions = dims;\n}\n\nexport function detectCapabilities(): TerminalCapabilities {\n\tconst termProgram = process.env.TERM_PROGRAM?.toLowerCase() || \"\";\n\tconst term = process.env.TERM?.toLowerCase() || \"\";\n\tconst colorTerm = process.env.COLORTERM?.toLowerCase() || \"\";\n\n\t// tmux and screen swallow OSC 8 by default (passthrough is opt-in and wraps\n\t// sequences differently). Force hyperlinks off whenever we detect them, even\n\t// when the outer terminal would otherwise support OSC 8. Image protocols are\n\t// also unreliable under tmux/screen, so leave `images: null` for safety.\n\tconst inTmuxOrScreen = !!process.env.TMUX || term.startsWith(\"tmux\") || term.startsWith(\"screen\");\n\tif (inTmuxOrScreen) {\n\t\tconst trueColor = colorTerm === \"truecolor\" || colorTerm === \"24bit\";\n\t\treturn { images: null, trueColor, hyperlinks: false };\n\t}\n\n\tif (process.env.KITTY_WINDOW_ID || termProgram === \"kitty\") {\n\t\treturn { images: \"kitty\", trueColor: true, hyperlinks: true };\n\t}\n\n\tif (termProgram === \"ghostty\" || term.includes(\"ghostty\") || process.env.GHOSTTY_RESOURCES_DIR) {\n\t\treturn { images: \"kitty\", trueColor: true, hyperlinks: true };\n\t}\n\n\tif (process.env.WEZTERM_PANE || termProgram === \"wezterm\") {\n\t\treturn { images: \"kitty\", trueColor: true, hyperlinks: true };\n\t}\n\n\tif (process.env.ITERM_SESSION_ID || termProgram === \"iterm.app\") {\n\t\treturn { images: \"iterm2\", trueColor: true, hyperlinks: true };\n\t}\n\n\tif (termProgram === \"vscode\") {\n\t\treturn { images: null, trueColor: true, hyperlinks: true };\n\t}\n\n\tif (termProgram === \"alacritty\") {\n\t\treturn { images: null, trueColor: true, hyperlinks: true };\n\t}\n\n\t// Unknown terminal: be conservative. OSC 8 is rendered invisibly as \"just\n\t// text\" on terminals that swallow it, which means the URL disappears from\n\t// the rendered output. Default to the legacy `text (url)` behavior unless we\n\t// have positively identified a hyperlink-capable terminal above.\n\tconst trueColor = colorTerm === \"truecolor\" || colorTerm === \"24bit\";\n\treturn { images: null, trueColor, hyperlinks: false };\n}\n\nexport function getCapabilities(): TerminalCapabilities {\n\tif (!cachedCapabilities) {\n\t\tcachedCapabilities = detectCapabilities();\n\t}\n\treturn cachedCapabilities;\n}\n\nexport function resetCapabilitiesCache(): void {\n\tcachedCapabilities = null;\n}\n\n/** Override the cached capabilities. Useful in tests to exercise both code paths. */\nexport function setCapabilities(caps: TerminalCapabilities): void {\n\tcachedCapabilities = caps;\n}\n\nconst KITTY_PREFIX = \"\\x1b_G\";\nconst ITERM2_PREFIX = \"\\x1b]1337;File=\";\n\nexport function isImageLine(line: string): boolean {\n\t// Fast path: sequence at line start (single-row images)\n\tif (line.startsWith(KITTY_PREFIX) || line.startsWith(ITERM2_PREFIX)) {\n\t\treturn true;\n\t}\n\t// Slow path: sequence elsewhere (multi-row images have cursor-up prefix)\n\treturn line.includes(KITTY_PREFIX) || line.includes(ITERM2_PREFIX);\n}\n\n/**\n * Generate a random image ID for Kitty graphics protocol.\n * Uses random IDs to avoid collisions between different module instances\n * (e.g., main app vs extensions).\n */\nexport function allocateImageId(): number {\n\t// Use random ID in range [1, 0xffffffff] to avoid collisions\n\treturn Math.floor(Math.random() * 0xfffffffe) + 1;\n}\n\nexport function encodeKitty(\n\tbase64Data: string,\n\toptions: {\n\t\tcolumns?: number;\n\t\trows?: number;\n\t\timageId?: number;\n\t\t/** Whether Kitty should apply its default cursor movement after placement. Default: true. */\n\t\tmoveCursor?: boolean;\n\t} = {},\n): string {\n\tconst CHUNK_SIZE = 4096;\n\n\tconst params: string[] = [\"a=T\", \"f=100\", \"q=2\"];\n\n\tif (options.moveCursor === false) params.push(\"C=1\");\n\tif (options.columns) params.push(`c=${options.columns}`);\n\tif (options.rows) params.push(`r=${options.rows}`);\n\tif (options.imageId) params.push(`i=${options.imageId}`);\n\n\tif (base64Data.length <= CHUNK_SIZE) {\n\t\treturn `\\x1b_G${params.join(\",\")};${base64Data}\\x1b\\\\`;\n\t}\n\n\tconst chunks: string[] = [];\n\tlet offset = 0;\n\tlet isFirst = true;\n\n\twhile (offset < base64Data.length) {\n\t\tconst chunk = base64Data.slice(offset, offset + CHUNK_SIZE);\n\t\tconst isLast = offset + CHUNK_SIZE >= base64Data.length;\n\n\t\tif (isFirst) {\n\t\t\tchunks.push(`\\x1b_G${params.join(\",\")},m=1;${chunk}\\x1b\\\\`);\n\t\t\tisFirst = false;\n\t\t} else if (isLast) {\n\t\t\tchunks.push(`\\x1b_Gm=0;${chunk}\\x1b\\\\`);\n\t\t} else {\n\t\t\tchunks.push(`\\x1b_Gm=1;${chunk}\\x1b\\\\`);\n\t\t}\n\n\t\toffset += CHUNK_SIZE;\n\t}\n\n\treturn chunks.join(\"\");\n}\n\n/**\n * Delete a Kitty graphics image by ID.\n * Uses uppercase 'I' to also free the image data.\n */\nexport function deleteKittyImage(imageId: number): string {\n\treturn `\\x1b_Ga=d,d=I,i=${imageId},q=2\\x1b\\\\`;\n}\n\n/**\n * Delete all visible Kitty graphics images.\n * Uses uppercase 'A' to also free the image data.\n */\nexport function deleteAllKittyImages(): string {\n\treturn \"\\x1b_Ga=d,d=A,q=2\\x1b\\\\\";\n}\n\nexport function encodeITerm2(\n\tbase64Data: string,\n\toptions: {\n\t\twidth?: number | string;\n\t\theight?: number | string;\n\t\tname?: string;\n\t\tpreserveAspectRatio?: boolean;\n\t\tinline?: boolean;\n\t} = {},\n): string {\n\tconst params: string[] = [`inline=${options.inline !== false ? 1 : 0}`];\n\n\tif (options.width !== undefined) params.push(`width=${options.width}`);\n\tif (options.height !== undefined) params.push(`height=${options.height}`);\n\tif (options.name) {\n\t\tconst nameBase64 = Buffer.from(options.name).toString(\"base64\");\n\t\tparams.push(`name=${nameBase64}`);\n\t}\n\tif (options.preserveAspectRatio === false) {\n\t\tparams.push(\"preserveAspectRatio=0\");\n\t}\n\n\treturn `\\x1b]1337;File=${params.join(\";\")}:${base64Data}\\x07`;\n}\n\nexport function calculateImageRows(\n\timageDimensions: ImageDimensions,\n\ttargetWidthCells: number,\n\tcellDimensions: CellDimensions = { widthPx: 9, heightPx: 18 },\n): number {\n\tconst targetWidthPx = targetWidthCells * cellDimensions.widthPx;\n\tconst scale = targetWidthPx / imageDimensions.widthPx;\n\tconst scaledHeightPx = imageDimensions.heightPx * scale;\n\tconst rows = Math.ceil(scaledHeightPx / cellDimensions.heightPx);\n\treturn Math.max(1, rows);\n}\n\nexport function getPngDimensions(base64Data: string): ImageDimensions | null {\n\ttry {\n\t\tconst buffer = Buffer.from(base64Data, \"base64\");\n\n\t\tif (buffer.length < 24) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif (buffer[0] !== 0x89 || buffer[1] !== 0x50 || buffer[2] !== 0x4e || buffer[3] !== 0x47) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst width = buffer.readUInt32BE(16);\n\t\tconst height = buffer.readUInt32BE(20);\n\n\t\treturn { widthPx: width, heightPx: height };\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nexport function getJpegDimensions(base64Data: string): ImageDimensions | null {\n\ttry {\n\t\tconst buffer = Buffer.from(base64Data, \"base64\");\n\n\t\tif (buffer.length < 2) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif (buffer[0] !== 0xff || buffer[1] !== 0xd8) {\n\t\t\treturn null;\n\t\t}\n\n\t\tlet offset = 2;\n\t\twhile (offset < buffer.length - 9) {\n\t\t\tif (buffer[offset] !== 0xff) {\n\t\t\t\toffset++;\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst marker = buffer[offset + 1];\n\n\t\t\tif (marker >= 0xc0 && marker <= 0xc2) {\n\t\t\t\tconst height = buffer.readUInt16BE(offset + 5);\n\t\t\t\tconst width = buffer.readUInt16BE(offset + 7);\n\t\t\t\treturn { widthPx: width, heightPx: height };\n\t\t\t}\n\n\t\t\tif (offset + 3 >= buffer.length) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\tconst length = buffer.readUInt16BE(offset + 2);\n\t\t\tif (length < 2) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\toffset += 2 + length;\n\t\t}\n\n\t\treturn null;\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nexport function getGifDimensions(base64Data: string): ImageDimensions | null {\n\ttry {\n\t\tconst buffer = Buffer.from(base64Data, \"base64\");\n\n\t\tif (buffer.length < 10) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst sig = buffer.slice(0, 6).toString(\"ascii\");\n\t\tif (sig !== \"GIF87a\" && sig !== \"GIF89a\") {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst width = buffer.readUInt16LE(6);\n\t\tconst height = buffer.readUInt16LE(8);\n\n\t\treturn { widthPx: width, heightPx: height };\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nexport function getWebpDimensions(base64Data: string): ImageDimensions | null {\n\ttry {\n\t\tconst buffer = Buffer.from(base64Data, \"base64\");\n\n\t\tif (buffer.length < 30) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst riff = buffer.slice(0, 4).toString(\"ascii\");\n\t\tconst webp = buffer.slice(8, 12).toString(\"ascii\");\n\t\tif (riff !== \"RIFF\" || webp !== \"WEBP\") {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst chunk = buffer.slice(12, 16).toString(\"ascii\");\n\t\tif (chunk === \"VP8 \") {\n\t\t\tif (buffer.length < 30) return null;\n\t\t\tconst width = buffer.readUInt16LE(26) & 0x3fff;\n\t\t\tconst height = buffer.readUInt16LE(28) & 0x3fff;\n\t\t\treturn { widthPx: width, heightPx: height };\n\t\t} else if (chunk === \"VP8L\") {\n\t\t\tif (buffer.length < 25) return null;\n\t\t\tconst bits = buffer.readUInt32LE(21);\n\t\t\tconst width = (bits & 0x3fff) + 1;\n\t\t\tconst height = ((bits >> 14) & 0x3fff) + 1;\n\t\t\treturn { widthPx: width, heightPx: height };\n\t\t} else if (chunk === \"VP8X\") {\n\t\t\tif (buffer.length < 30) return null;\n\t\t\tconst width = (buffer[24] | (buffer[25] << 8) | (buffer[26] << 16)) + 1;\n\t\t\tconst height = (buffer[27] | (buffer[28] << 8) | (buffer[29] << 16)) + 1;\n\t\t\treturn { widthPx: width, heightPx: height };\n\t\t}\n\n\t\treturn null;\n\t} catch {\n\t\treturn null;\n\t}\n}\n\nexport function getImageDimensions(base64Data: string, mimeType: string): ImageDimensions | null {\n\tif (mimeType === \"image/png\") {\n\t\treturn getPngDimensions(base64Data);\n\t}\n\tif (mimeType === \"image/jpeg\") {\n\t\treturn getJpegDimensions(base64Data);\n\t}\n\tif (mimeType === \"image/gif\") {\n\t\treturn getGifDimensions(base64Data);\n\t}\n\tif (mimeType === \"image/webp\") {\n\t\treturn getWebpDimensions(base64Data);\n\t}\n\treturn null;\n}\n\nexport function renderImage(\n\tbase64Data: string,\n\timageDimensions: ImageDimensions,\n\toptions: ImageRenderOptions = {},\n): { sequence: string; rows: number; imageId?: number } | null {\n\tconst caps = getCapabilities();\n\n\tif (!caps.images) {\n\t\treturn null;\n\t}\n\n\tconst maxWidth = options.maxWidthCells ?? 80;\n\tconst rows = calculateImageRows(imageDimensions, maxWidth, getCellDimensions());\n\n\tif (caps.images === \"kitty\") {\n\t\tconst sequence = encodeKitty(base64Data, {\n\t\t\tcolumns: maxWidth,\n\t\t\trows,\n\t\t\timageId: options.imageId,\n\t\t\tmoveCursor: options.moveCursor,\n\t\t});\n\t\treturn { sequence, rows, imageId: options.imageId };\n\t}\n\n\tif (caps.images === \"iterm2\") {\n\t\tconst sequence = encodeITerm2(base64Data, {\n\t\t\twidth: maxWidth,\n\t\t\theight: \"auto\",\n\t\t\tpreserveAspectRatio: options.preserveAspectRatio ?? true,\n\t\t});\n\t\treturn { sequence, rows };\n\t}\n\n\treturn null;\n}\n\n/**\n * Wrap text in an OSC 8 hyperlink sequence.\n * The text is rendered as a clickable hyperlink in terminals that support OSC 8\n * (Ghostty, Kitty, WezTerm, iTerm2, VSCode, and others).\n * In terminals that do not support OSC 8, the escape sequences are ignored\n * and only the plain text is displayed.\n *\n * @param text - The visible text to display\n * @param url - The URL to link to\n */\nexport function hyperlink(text: string, url: string): string {\n\treturn `\\x1b]8;;${url}\\x1b\\\\${text}\\x1b]8;;\\x1b\\\\`;\n}\n\nexport function imageFallback(mimeType: string, dimensions?: ImageDimensions, filename?: string): string {\n\tconst parts: string[] = [];\n\tif (filename) parts.push(filename);\n\tparts.push(`[${mimeType}]`);\n\tif (dimensions) parts.push(`${dimensions.widthPx}x${dimensions.heightPx}`);\n\treturn `[Image: ${parts.join(\" \")}]`;\n}\n"]}