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feature focus on 3d viewer, add copy/paste

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This commit is contained in:
matei jordache
2026-03-26 21:25:35 -07:00
parent de0b49acc5
commit 30671a5362
24 changed files with 1680 additions and 320 deletions
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10
frontend/src/pngMetadata.js
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@@ -3,7 +3,7 @@
*
* PNG files are composed of chunks: [4-byte length][4-byte type][data][4-byte CRC].
* We add an iTXt chunk with key "workflow" containing the JSON-serialised graph,
* inserted just before the IEND chunk. We still read legacy tEXt chunks.
* inserted just before the IEND chunk.
*/
// ── CRC32 (PNG uses CRC-32/ISO 3309) ────────────────────────────────
@@ -71,10 +71,6 @@ function parseTextChunk(type, chunkData) {
const keyword = decoder.decode(chunkData.subarray(0, keywordEnd));
if (keyword !== 'workflow') return null;
if (type === 'tEXt') {
return JSON.parse(decoder.decode(chunkData.subarray(keywordEnd + 1)));
}
if (type !== 'iTXt') return null;
const compressionFlagIdx = keywordEnd + 1;
@@ -139,7 +135,7 @@ export async function embedWorkflow(pngBlob, workflow) {
}
/**
* Extract the workflow object from a PNG blob's iTXt/tEXt chunks.
* Extract the workflow object from a PNG blob's iTXt chunks.
* Returns the parsed object, or null if no "workflow" key is found.
*/
export async function extractWorkflow(pngBlob) {
@@ -154,7 +150,7 @@ export async function extractWorkflow(pngBlob) {
if (pos + 12 + len > data.length) break;
const type = chunkType(data, pos);
if (type === 'tEXt' || type === 'iTXt') {
if (type === 'iTXt') {
const chunkData = data.subarray(pos + 8, pos + 8 + len);
const parsed = parseTextChunk(type, chunkData);
if (parsed) found = parsed;