{"record":{"id":"ae9e1caba509fdca","repo":"remotion-dev/remotion","slug":"failed-to-acquire-2d-context-for-color-parsing-ae9e1c","errorCode":null,"errorMessage":"Failed to acquire 2D context for color parsing","messagePattern":"Failed to acquire 2D context for color parsing","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"critical","filePath":"packages/effects/src/linear-gradient-tint.ts","lineNumber":318,"sourceCode":"\tgl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);\n\n\tconst aPos = gl.getAttribLocation(program, 'aPos');\n\tconst aUv = gl.getAttribLocation(program, 'aUv');\n\tgl.enableVertexAttribArray(aPos);\n\tgl.vertexAttribPointer(aPos, 2, gl.FLOAT, false, 16, 0);\n\tgl.enableVertexAttribArray(aUv);\n\tgl.vertexAttribPointer(aUv, 2, gl.FLOAT, false, 16, 8);\n\n\tgl.bindVertexArray(null);\n\n\tconst textureSource = createRgbaTexture(gl);\n\n\tconst colorCanvas = document.createElement('canvas');\n\tcolorCanvas.width = 1;\n\tcolorCanvas.height = 1;\n\tconst colorCtx = colorCanvas.getContext('2d', {willReadFrequently: true});\n\tif (!colorCtx) {\n\t\tthrow new Error('Failed to acquire 2D context for color parsing');\n\t}\n\n\treturn {\n\t\tgl,\n\t\tprogram,\n\t\tvao,\n\t\tvbo,\n\t\ttextureSource,\n\t\tuniforms: {\n\t\t\tuSource: gl.getUniformLocation(program, 'uSource'),\n\t\t\tuStart: gl.getUniformLocation(program, 'uStart'),\n\t\t\tuEnd: gl.getUniformLocation(program, 'uEnd'),\n\t\t\tuStartColor: gl.getUniformLocation(program, 'uStartColor'),\n\t\t\tuEndColor: gl.getUniformLocation(program, 'uEndColor'),\n\t\t\tuAmount: gl.getUniformLocation(program, 'uAmount'),\n\t\t},\n\t\tcolorCtx,\n\t\tcachedStartColor: '',","sourceCodeStart":300,"sourceCodeEnd":336,"githubUrl":"https://github.com/remotion-dev/remotion/blob/78fe4bb3fdb5a2cd68724393d63cb223db333fa7/packages/effects/src/linear-gradient-tint.ts#L300-L336","documentation":"Thrown when a 1x1 helper canvas's `getContext('2d', {willReadFrequently:true})` returns null inside linearGradientTint setup. The 2D context exists solely to parse the `startColor`/`endColor` strings via the browser color parser; it is independent of the WebGL rendering path.","triggerScenarios":"Runtime without a 2D canvas implementation (jsdom without a polyfill); per-page canvas context cap exceeded; sandbox/CSP disabling 2D canvas.","commonSituations":"jsdom unit tests lacking a CanvasRenderingContext2D polyfill; long-lived pages hitting the canvas-context cap; sandboxed iframes blocking canvas.","solutions":["In jsdom tests, install a canvas polyfill or skip the effect under test.","Close unused canvas contexts in long-running apps to stay under the browser cap.","Run the effect in a full browser engine (Chromium) render worker.","Relax sandbox/CSP so 2D canvas is available."],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":"const has2dContext = (): boolean => {\n  try {\n    return !!document.createElement('canvas').getContext('2d', { willReadFrequently: true });\n  } catch {\n    return false;\n  }\n};","typeGuard":"const canParseColors = (): boolean => {\n  try { return !!document.createElement('canvas').getContext('2d'); } catch { return false; }\n};","tryCatchPattern":null,"preventionTips":["Run linearGradientTint in a real browser engine, not jsdom without a canvas polyfill.","Free unused canvas contexts to stay under the per-page cap.","Whitelist 2D canvas in sandbox/CSP for the render worker."],"tags":["canvas","linear-gradient-tint","effects","environment","color-parsing"],"backgroundTag":null,"analyzedSha":"78fe4bb3fdb5a2cd68724393d63cb223db333fa7","analyzedAt":"2026-08-12T17:18:50.444Z","schemaVersion":2},"datasetVersion":"2026-08-12T23:17:12.415Z"}