{ "openapi": "3.1.1", "info": { "title": "Pixel Grid Transform API", "version": "1.0.0", "summary": "Flip, rotate or shift an indexed pixel sprite without blur.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://fliplinepixeltransform.usefulweb.app" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Flip, rotate or shift an indexed pixel sprite without blur.", "description": "Enter a compact pixel grid and HEX palette. Transform it with exact integer coordinates, optional wrapping and transparent pixels, then download an editable Flipline Pixel Studio project.\n\nMethodology:\n- Grid index 0 is transparent; 1–9 and A–W refer to palette entries 1–32. Rows must have equal width, at most 128 pixels per side.\n- Rotation is clockwise and swaps width and height. Shift clips outside pixels or wraps them to the opposite edge. No interpolation or color changes.\n- The same transform powers Pixel Studio. Open the downloaded .flipline-pixels.json file with the main Open button or Open sprite.", "tags": [ "apps" ], "x-mcp-tool": "flipline_pixel_transform", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/FliplinePixelTransformInput" }, "examples": { "example1": { "summary": "Rotate a tiny sprite", "value": { "rows": "1..\n.2.", "palette": "#213b45,#65a87b", "operation": "rotate" } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/FliplinePixelTransformResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "FliplinePixelTransformInput": { "type": "object", "additionalProperties": false, "properties": { "rows": { "title": "Pixel rows (. = transparent; 1–9 then A–W = palette entries)", "type": "string", "maxLength": 16640, "default": "..1..\n.121.\n12321\n.121.\n..1.." }, "palette": { "title": "HEX palette (comma separated)", "type": "string", "maxLength": 300, "default": "#213b45,#65a87b,#e6af61" }, "operation": { "title": "Operation", "type": "string", "enum": [ "flip-x", "flip-y", "rotate", "shift" ], "default": "rotate" }, "dx": { "title": "Shift X (pixels)", "type": "integer", "minimum": -128, "maximum": 128, "default": 1 }, "dy": { "title": "Shift Y (pixels)", "type": "integer", "minimum": -128, "maximum": 128, "default": 0 }, "wrap": { "title": "Wrap shifted pixels", "type": "boolean", "default": false } }, "required": [] }, "FliplinePixelTransformResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object", "additionalProperties": false, "required": [ "width", "height", "rows", "project" ], "properties": { "width": { "type": "integer" }, "height": { "type": "integer" }, "rows": { "type": "array", "items": { "type": "string" } }, "project": { "type": "object", "additionalProperties": false, "required": [ "format", "version", "name", "width", "height", "fps", "background", "palette", "frames", "layers" ], "properties": { "format": { "const": "flipline-pixels" }, "version": { "const": 1 }, "name": { "type": "string", "maxLength": 120 }, "width": { "type": "integer", "minimum": 1, "maximum": 128 }, "height": { "type": "integer", "minimum": 1, "maximum": 128 }, "fps": { "type": "integer", "minimum": 1, "maximum": 30 }, "background": { "type": "string", "pattern": "^#[a-fA-F0-9]{6}$" }, "palette": { "type": "array", "minItems": 1, "maxItems": 32, "items": { "type": "string", "pattern": "^#[a-fA-F0-9]{6}$" } }, "frames": { "type": "array", "minItems": 1, "maxItems": 24, "items": { "type": "object", "additionalProperties": false, "required": [ "hold", "label" ], "properties": { "hold": { "type": "integer", "minimum": 1, "maximum": 10 }, "label": { "type": "string", "maxLength": 80 } } } }, "layers": { "type": "array", "minItems": 1, "maxItems": 4, "items": { "type": "object", "additionalProperties": false, "required": [ "name", "visible", "locked", "opacity", "cels" ], "properties": { "name": { "type": "string", "maxLength": 80 }, "visible": { "type": "boolean" }, "locked": { "type": "boolean" }, "opacity": { "type": "number", "minimum": 0, "maximum": 1 }, "cels": { "type": "array", "minItems": 1, "maxItems": 24, "items": { "type": "array", "minItems": 1, "maxItems": 16384, "items": { "type": "integer", "minimum": 0, "maximum": 32 } } } } } } }, "description": "Palette indices: 0 is transparent; 1–32 refer to palette entries. Every cel has width × height pixels and every layer has one cel per frame. Indices cannot exceed palette length. Maximum 524288 total stored cel pixels. Layers are front to back. Files: .flipline-pixels.json." } } }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }