feat: support canvas in drawImage and upgrade canvaskit version (#23)

* chore: upgrade canvaskit version

* feat: support canvas in drawImage

README.md

@@ -1,45 +1,55 @@
-# deno-canvas
-
-Canvas API for Deno, ported from
-[canvaskit-wasm (Skia)](https://github.com/google/skia/tree/main/modules/canvaskit).
-
-## Installation
-
-Import from https://deno.land/x/canvas/mod.ts or just import from raw GitHub
-URL, https://raw.githubusercontent.com/DjDeveloperr/deno-canvas/master/mod.ts.
-
-## Usage
-
-`mod.ts` provides a default export exposing the complete CanvasKit API, and
-other exports from the file are types and utility functions.
-
-```ts
-import { createCanvas } from "https://deno.land/x/canvas/mod.ts";
-import { serve } from "https://deno.land/std/http/server.ts";
-
-const canvas = createCanvas(200, 200);
-const ctx = canvas.getContext("2d");
-
-ctx.fillStyle = "red";
-ctx.fillRect(10, 10, 200 - 20, 200 - 20);
-
-await Deno.writeFile("image.png", canvas.toBuffer());
-```
-
-And run with `deno run --allow-write filename.ts`.
-
-You can also try this HTTP server example,
-https://raw.githubusercontent.com/DjDeveloperr/deno-canvas/master/examples/square.ts
-
-For using images, use `loadImage` method exported from `mod.ts`.
-
-```ts
-const image = await loadImage(myURL);
-ctx.drawImage(image, x, y);
-```
-
-## License
-
-Check [LICENSE](./LICENSE) for more info.
-
-Copyright 2022 © DjDeveloperr
+# deno-canvas
+
+Canvas API for Deno, ported from
+[canvaskit-wasm (Skia)](https://github.com/google/skia/tree/main/modules/canvaskit).
+
+## Installation
+
+Import from https://deno.land/x/canvas/mod.ts or just import from raw GitHub
+URL, https://raw.githubusercontent.com/DjDeveloperr/deno-canvas/master/mod.ts.
+
+## Usage
+
+`mod.ts` provides a default export exposing the complete CanvasKit API, and
+other exports from the file are types and utility functions.
+
+```ts
+import { createCanvas } from "https://deno.land/x/canvas/mod.ts";
+import { serve } from "https://deno.land/std/http/server.ts";
+
+const canvas = createCanvas(200, 200);
+const ctx = canvas.getContext("2d");
+
+ctx.fillStyle = "red";
+ctx.fillRect(10, 10, 200 - 20, 200 - 20);
+
+await Deno.writeFile("image.png", canvas.toBuffer());
+```
+
+And run with `deno run --allow-write filename.ts`.
+
+You can also try this HTTP server example,
+https://raw.githubusercontent.com/DjDeveloperr/deno-canvas/master/examples/square.ts
+
+For using images, use `loadImage` method exported from `mod.ts`.
+
+```ts
+const image = await loadImage(myURL);
+ctx.drawImage(image, x, y);
+```
+
+## Limitations
+
+[Just like original canvaskit-wasm, the emulated Canvas has some limitations:](https://github.com/google/skia/tree/main/modules/canvaskit/npm_build#known-issues-with-canvas2d-emulation-layer)
+
+- measureText returns width only and does no shaping. It is only sort of valid
+  with ASCII letters.
+- textAlign is not supported.
+- textBaseAlign is not supported.
+- fillText does not support the width parameter.
+
+## License
+
+Check [LICENSE](./LICENSE) for more info.
+
+Copyright 2022 © DjDeveloperr

deps.ts

@@ -1,4 +1,4 @@
-export {
-  decode,
-  encode,
-} from "https://deno.land/[email protected]/encoding/base64.ts";
+export {
+  decode,
+  encode,
+} from "https://deno.land/[email protected]/encoding/base64.ts";

examples/basic.ts

@@ -1,9 +1,9 @@
-import { createCanvas } from "../mod.ts";
-
-const canvas = createCanvas(200, 200);
-const ctx = canvas.getContext("2d");
-
-ctx.fillStyle = "hsl(0, 100%, 50%)";
-ctx.fillRect(10, 10, 200 - 20, 200 - 20);
-
-await Deno.writeFile("image.png", canvas.toBuffer());
+import { createCanvas } from "../mod.ts";
+
+const canvas = createCanvas(200, 200);
+const ctx = canvas.getContext("2d");
+
+ctx.fillStyle = "hsl(0, 100%, 50%)";
+ctx.fillRect(10, 10, 200 - 20, 200 - 20);
+
+await Deno.writeFile("image.png", canvas.toBuffer());

examples/image.ts

@@ -1,18 +1,28 @@
-import { createCanvas, loadImage } from "../mod.ts";
-
-const canvas = createCanvas(200, 200);
-const ctx = canvas.getContext("2d");
-
-ctx.fillStyle = "red";
-ctx.fillRect(10, 10, 200 - 20, 200 - 20);
-
-const img = await loadImage(
-  "https://cdn.discordapp.com/emojis/587737413330272291.gif?v=1",
-);
-ctx.drawImage(img, 100 - img.width() / 2, 100 - img.height() / 2);
-
-const img2 = await loadImage('data:image/png;base64,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')
-
-ctx.drawImage(img2, 0, 0);
-
-await Deno.writeFile("image.png", canvas.toBuffer());
+import { createCanvas, loadImage } from "../mod.ts";
+
+const canvas = createCanvas(200, 200);
+const ctx = canvas.getContext("2d");
+
+ctx.fillStyle = "red";
+ctx.fillRect(10, 10, 200 - 20, 200 - 20);
+
+const img = await loadImage(
+  "https://cdn.discordapp.com/emojis/587737413330272291.gif?v=1",
+);
+ctx.drawImage(img, 100 - img.width() / 2, 100 - img.height() / 2);
+
+const canvas2 = createCanvas(200, 200);
+const ctx2 = canvas2.getContext("2d");
+
+const img2 = await loadImage(
+  "data:image/png;base64,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",
+);
+
+ctx2.drawImage(img2, 0, 0);
+ctx.drawImage(canvas2, 0, 0);
+
+await Deno.writeFile("image.png", canvas.toBuffer());
+
+// Explicitly just exit because canvaskit has some background cleanup
+// going on.
+Deno.exit();

mod.ts

@@ -1,7 +1,7 @@
-import { init } from "./src/canvas.ts";
-
-const canvas = await init();
-
-export { canvas };
-export default canvas;
-export * from "./src/canvas.ts";
+import { init } from "./src/canvas.ts";
+
+const canvas = await init();
+
+export { canvas };
+export default canvas;
+export * from "./src/canvas.ts";

src/base64.ts

@@ -1,25 +1,25 @@
-import { decode, encode } from "../deps.ts";
-
-// core is unstable (in sense of actual stability not --unstable)
-// so we'll fallback to pure js impl
-// why use internal op? it's super fast
-
-export function decodeBase64(value: string): Uint8Array {
-  let res;
-  try {
-    res = (Deno as any).core.opSync("op_base64_decode", value);
-  } catch (e) {
-    res = decode(value);
-  }
-  return res;
-}
-
-export function encodeBase64(value: Uint8Array): string {
-  let res;
-  try {
-    res = (Deno as any).core.opSync("op_base64_encode", value);
-  } catch (e) {
-    res = encode(value);
-  }
-  return res;
-}
+import { decode, encode } from "../deps.ts";
+
+// core is unstable (in sense of actual stability not --unstable)
+// so we'll fallback to pure js impl
+// why use internal op? it's super fast
+
+export function decodeBase64(value: string): Uint8Array {
+  let res;
+  try {
+    res = (Deno as any).core.opSync("op_base64_decode", value);
+  } catch (e) {
+    res = decode(value);
+  }
+  return res;
+}
+
+export function encodeBase64(value: Uint8Array): string {
+  let res;
+  try {
+    res = (Deno as any).core.opSync("op_base64_encode", value);
+  } catch (e) {
+    res = encode(value);
+  }
+  return res;
+}