✨ feat: layer effects, bucket fill, simple brush

2026-09-02 14:18:35 +00:00 · 2026-05-21 00:02:12 +07:00
parent bcf4650c70
commit e7dd9420e7
47 changed files with 1675 additions and 1038 deletions
@@ -0,0 +1,145 @@
+import type { FaceBlurEffect } from "@pien-studio/types";
+import type { EffectRenderer, EffectRenderContext } from "./types";
+
+function drawPixelatedRegion(
+  ctx: CanvasRenderingContext2D,
+  source: CanvasImageSource,
+  sourceX: number,
+  sourceY: number,
+  sourceWidth: number,
+  sourceHeight: number,
+  targetX: number,
+  targetY: number,
+  targetWidth: number,
+  targetHeight: number,
+  blockSize: number,
+) {
+  const sampleCanvas = document.createElement("canvas");
+  sampleCanvas.width = Math.max(1, Math.round(targetWidth / blockSize));
+  sampleCanvas.height = Math.max(1, Math.round(targetHeight / blockSize));
+  const sampleCtx = sampleCanvas.getContext("2d");
+  if (!sampleCtx) return;
+  sampleCtx.imageSmoothingEnabled = false;
+  sampleCtx.drawImage(source, sourceX, sourceY, sourceWidth, sourceHeight, 0, 0, sampleCanvas.width, sampleCanvas.height);
+  ctx.imageSmoothingEnabled = false;
+  ctx.drawImage(sampleCanvas, 0, 0, sampleCanvas.width, sampleCanvas.height, targetX, targetY, targetWidth, targetHeight);
+  ctx.imageSmoothingEnabled = true;
+}
+
+function drawBlurredRegionFallback(
+  ctx: CanvasRenderingContext2D,
+  source: CanvasImageSource,
+  sourceX: number,
+  sourceY: number,
+  sourceWidth: number,
+  sourceHeight: number,
+  targetX: number,
+  targetY: number,
+  targetWidth: number,
+  targetHeight: number,
+  amount: number,
+) {
+  const regionCanvas = document.createElement("canvas");
+  regionCanvas.width = Math.max(1, Math.round(targetWidth));
+  regionCanvas.height = Math.max(1, Math.round(targetHeight));
+  const regionCtx = regionCanvas.getContext("2d");
+  if (!regionCtx) return;
+  regionCtx.drawImage(source, sourceX, sourceY, sourceWidth, sourceHeight, 0, 0, regionCanvas.width, regionCanvas.height);
+  const scale = Math.max(0.04, Math.min(0.5, 1 / Math.max(2, amount / 2)));
+  const blurCanvas = document.createElement("canvas");
+  blurCanvas.width = Math.max(1, Math.round(regionCanvas.width * scale));
+  blurCanvas.height = Math.max(1, Math.round(regionCanvas.height * scale));
+  const blurCtx = blurCanvas.getContext("2d");
+  if (!blurCtx) return;
+  blurCtx.imageSmoothingEnabled = true;
+  blurCtx.drawImage(regionCanvas, 0, 0, blurCanvas.width, blurCanvas.height);
+  for (let i = 0; i < 3; i++) {
+    regionCtx.clearRect(0, 0, regionCanvas.width, regionCanvas.height);
+    regionCtx.drawImage(blurCanvas, 0, 0, blurCanvas.width, blurCanvas.height, 0, 0, regionCanvas.width, regionCanvas.height);
+    blurCtx.clearRect(0, 0, blurCanvas.width, blurCanvas.height);
+    blurCtx.drawImage(regionCanvas, 0, 0, regionCanvas.width, regionCanvas.height, 0, 0, blurCanvas.width, blurCanvas.height);
+  }
+  ctx.drawImage(regionCanvas, 0, 0, regionCanvas.width, regionCanvas.height, targetX, targetY, targetWidth, targetHeight);
+}
+
+function renderRegions(
+  ctx: CanvasRenderingContext2D,
+  image: HTMLImageElement,
+  effect: FaceBlurEffect,
+  targetWidth: number,
+  targetHeight: number,
+) {
+  if (!effect.regions.length) return;
+  const legacyScaleX = image.naturalWidth / Math.max(1, targetWidth);
+  const legacyScaleY = image.naturalHeight / Math.max(1, targetHeight);
+
+  for (const region of effect.regions) {
+    const sourceWidth = region.sourceWidth ?? 0;
+    const sourceHeight = region.sourceHeight ?? 0;
+    const hasSourceDims = sourceWidth > 0 && sourceHeight > 0;
+    const scaleX = hasSourceDims ? targetWidth / sourceWidth : 1;
+    const scaleY = hasSourceDims ? targetHeight / sourceHeight : 1;
+
+    const x = Math.max(0, Math.floor(region.x * scaleX));
+    const y = Math.max(0, Math.floor(region.y * scaleY));
+    const w = Math.max(1, Math.floor(region.width * scaleX));
+    const h = Math.max(1, Math.floor(region.height * scaleY));
+    const sx0 = hasSourceDims ? region.x : Math.max(0, Math.floor(region.x * legacyScaleX));
+    const sy0 = hasSourceDims ? region.y : Math.max(0, Math.floor(region.y * legacyScaleY));
+    const sw = hasSourceDims ? region.width : Math.max(1, Math.floor(region.width * legacyScaleX));
+    const sh = hasSourceDims ? region.height : Math.max(1, Math.floor(region.height * legacyScaleY));
+
+    if (effect.method === "censor") {
+      ctx.fillStyle = region.censorColor ?? effect.censorColor ?? "#111111";
+      ctx.fillRect(x, y, w, h);
+      continue;
+    }
+    if (effect.method === "pixelate") {
+      drawPixelatedRegion(ctx, image, sx0, sy0, sw, sh, x, y, w, h, Math.max(4, Math.round(effect.amount / 2)));
+      continue;
+    }
+    if ("filter" in ctx && typeof ctx.filter === "string") {
+      ctx.save();
+      ctx.filter = `blur(${effect.amount}px)`;
+      ctx.drawImage(image, sx0, sy0, sw, sh, x, y, w, h);
+      ctx.restore();
+      continue;
+    }
+    drawBlurredRegionFallback(ctx, image, sx0, sy0, sw, sh, x, y, w, h, effect.amount);
+  }
+}
+
+function renderLayer(context: EffectRenderContext, effect: FaceBlurEffect) {
+  const { ctx, image, targetWidth, targetHeight } = context;
+  if (!effect.regions.length) {
+    ctx.drawImage(image, 0, 0, targetWidth, targetHeight);
+    return;
+  }
+
+  const allHaveSourceDims = effect.regions.every((r) => (r.sourceWidth ?? 0) > 0 && (r.sourceHeight ?? 0) > 0);
+  if (!allHaveSourceDims) {
+    ctx.drawImage(image, 0, 0, targetWidth, targetHeight);
+    renderRegions(ctx, image, effect, targetWidth, targetHeight);
+    return;
+  }
+
+  const sourceCanvas = document.createElement("canvas");
+  sourceCanvas.width = Math.max(1, image.naturalWidth);
+  sourceCanvas.height = Math.max(1, image.naturalHeight);
+  const sourceCtx = sourceCanvas.getContext("2d");
+  if (!sourceCtx) {
+    ctx.drawImage(image, 0, 0, targetWidth, targetHeight);
+    return;
+  }
+  sourceCtx.drawImage(image, 0, 0, sourceCanvas.width, sourceCanvas.height);
+  renderRegions(sourceCtx, image, effect, sourceCanvas.width, sourceCanvas.height);
+  ctx.drawImage(sourceCanvas, 0, 0, sourceCanvas.width, sourceCanvas.height, 0, 0, targetWidth, targetHeight);
+}
+
+export const faceBlurRenderer: EffectRenderer<FaceBlurEffect> = {
+  kind: "face-blur",
+  render: ({ ctx, image, targetWidth, targetHeight }, effect) => {
+    renderRegions(ctx, image, effect, targetWidth, targetHeight);
+  },
+  renderLayer,
+};