First commit!

modules/dom/canvas.scm

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+;;; Copyright (C) 2024 David Thompson <dave@spritely.institute>
+;;;
+;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;; you may not use this file except in compliance with the License.
+;;; You may obtain a copy of the License at
+;;;
+;;;    http://www.apache.org/licenses/LICENSE-2.0
+;;;
+;;; Unless required by applicable law or agreed to in writing, software
+;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;; See the License for the specific language governing permissions and
+;;; limitations under the License.
+
+;;; Commentary:
+;;;
+;;; HTMLCanvasElement and CanvasRenderingContext2D bindings.
+;;;
+;;; Code:
+
+(define-module (dom canvas)
+  #:pure
+  #:use-module (scheme base)
+  #:use-module (hoot ffi)
+  #:export (get-context
+            set-fill-color!
+            set-font!
+            set-text-align!
+            clear-rect
+            fill-rect
+            fill-text
+            draw-image
+            set-scale!
+            set-transform!
+            set-image-smoothing-enabled!))
+
+;; HTMLCanvasElement
+(define-foreign get-context
+  "canvas" "getContext"
+  (ref extern) (ref string) -> (ref extern))
+
+;; CanvasRenderingContext2D
+(define-foreign set-fill-color!
+  "canvas" "setFillColor"
+  (ref extern) (ref string) -> none)
+(define-foreign set-font!
+  "canvas" "setFont"
+  (ref extern) (ref string) -> none)
+(define-foreign set-text-align!
+  "canvas" "setTextAlign"
+  (ref extern) (ref string) -> none)
+(define-foreign clear-rect
+  "canvas" "clearRect"
+  (ref extern) f64 f64 f64 f64 -> none)
+(define-foreign fill-rect
+  "canvas" "fillRect"
+  (ref extern) f64 f64 f64 f64 -> none)
+(define-foreign fill-text
+  "canvas" "fillText"
+  (ref extern) (ref string) f64 f64 -> none)
+(define-foreign draw-image
+  "canvas" "drawImage"
+  (ref extern) (ref extern) f64 f64 f64 f64 f64 f64 f64 f64 -> none)
+(define-foreign set-scale!
+  "canvas" "setScale"
+  (ref extern) f64 f64 -> none)
+(define-foreign set-transform!
+  "canvas" "setTransform"
+  (ref extern) f64 f64 f64 f64 f64 f64 -> none)
+(define-foreign set-image-smoothing-enabled!
+  "canvas" "setImageSmoothingEnabled"
+  (ref extern) i32 -> none)