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106 lines
3.3 KiB
Clojure
106 lines
3.3 KiB
Clojure
;; This Source Code Form is subject to the terms of the Mozilla Public
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;; License, v. 2.0. If a copy of the MPL was not distributed with this
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;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
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;;
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;; Copyright (c) KALEIDOS INC
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(ns app.main.rasterizer
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"A main entry point for the rasterizer API interface.
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This ns is responsible to provide an API for create rasterizer
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iframes and interact with them using asyncrhonous
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messages."
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(:require
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[app.common.data :as d]
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[app.common.data.macros :as dm]
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[app.common.uuid :as uuid]
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[app.config :as cf]
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[app.util.dom :as dom]
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[beicon.core :as rx]
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[cuerdas.core :as str]))
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(defonce ready? false)
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(defonce queue #js [])
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(defonce instance nil)
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(defonce msgbus (rx/subject))
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(defonce origin
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(dm/str (assoc cf/rasterizer-uri :path "/rasterizer.html")))
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(declare send-message!)
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(defn- process-queued-messages!
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[]
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(loop [message (.shift ^js queue)]
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(when (some? message)
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(send-message! message)
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(recur (.shift ^js queue)))))
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(defn- on-message
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"Handles a message from the rasterizer."
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[event]
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(let [evorigin (unchecked-get event "origin")
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evdata (unchecked-get event "data")]
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(when (and (object? evdata) (str/starts-with? origin evorigin))
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(let [scope (unchecked-get evdata "scope")
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type (unchecked-get evdata "type")]
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(when (= "penpot/rasterizer" scope)
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(when (= type "ready")
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(set! ready? true)
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(process-queued-messages!))
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(rx/push! msgbus evdata))))))
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(defn- send-message!
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"Sends a message to the rasterizer."
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[message]
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(let [window (.-contentWindow ^js instance)]
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(.postMessage ^js window message origin)))
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(defn- queue-message!
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"Queues a message to be sent to the thumbnail renderer when it's ready."
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[message]
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(.push ^js queue message))
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(defn render
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"Renders an SVG"
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[{:keys [data styles width result] :as params}]
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(let [styles (d/nilv styles "")
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result (d/nilv result "blob")
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id (dm/str (uuid/next))
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payload #js {:data data :styles styles :width width :result result}
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message #js {:id id
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:scope "penpot/rasterizer"
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:payload payload}]
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(if ^boolean ready?
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(send-message! message)
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(queue-message! message))
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(->> msgbus
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(rx/filter #(= id (unchecked-get % "id")))
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(rx/mapcat (fn [msg]
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(case (unchecked-get msg "type")
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"success" (rx/of (unchecked-get msg "payload"))
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"failure" (rx/throw (js/Error. (unchecked-get msg "payload"))))))
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(rx/take 1))))
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(defn render-node
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"Renders an SVG using a node"
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[{:keys [node styles width result] :as params}]
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(let [width (d/nilv width (dom/get-attribute node "width"))
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styles (d/nilv styles "")
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data (dom/node->xml node)
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result (d/nilv result "blob")]
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(render {:data data :styles styles :width width :result result})))
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(defn init!
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"Initializes the rasterizer."
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[]
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(let [iframe (dom/create-element "iframe")]
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(dom/set-attribute! iframe "src" origin)
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(dom/set-attribute! iframe "hidden" true)
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(dom/append-child! js/document.body iframe)
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(.addEventListener js/window "message" on-message)
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(set! instance iframe)
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))
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