feat: cropped images

packages/layout-engine/contracts/src/clip-path-inset.test.ts

@@ -0,0 +1,82 @@
+import { describe, expect, it } from 'vitest';
+import { parseInsetClipPathForScale, formatInsetClipPathTransform } from './clip-path-inset.js';
+
+describe('parseInsetClipPathForScale', () => {
+  it('returns scale and translate for valid inset(top right bottom left)', () => {
+    const result = parseInsetClipPathForScale('inset(10% 20% 30% 40%)');
+    expect(result).not.toBeNull();
+    // visibleW = 100 - 40 - 20 = 40, visibleH = 100 - 10 - 30 = 60
+    // scaleX = 100/40 = 2.5, scaleY = 100/60 = 5/3
+    // translateX = -40*2.5 = -100, translateY = -10*(5/3) = -50/3
+    expect(result!.scaleX).toBeCloseTo(2.5);
+    expect(result!.scaleY).toBeCloseTo(100 / 60);
+    expect(result!.translateX).toBeCloseTo(-100);
+    expect(result!.translateY).toBeCloseTo(-50 / 3);
+  });
+
+  it('returns scale 1 and translate 0 when no inset (full image visible)', () => {
+    const result = parseInsetClipPathForScale('inset(0% 0% 0% 0%)');
+    expect(result).not.toBeNull();
+    expect(result!.scaleX).toBe(1);
+    expect(result!.scaleY).toBe(1);
+    expect(result!.translateX).toBeCloseTo(0, 10);
+    expect(result!.translateY).toBeCloseTo(0, 10);
+  });
+
+  it('trims whitespace around clipPath', () => {
+    const result = parseInsetClipPathForScale('  inset(5% 10% 15% 20%)  ');
+    expect(result).not.toBeNull();
+    expect(result!.scaleX).toBeCloseTo(100 / (100 - 20 - 10));
+    expect(result!.scaleY).toBeCloseTo(100 / (100 - 5 - 15));
+  });
+
+  it('returns null for non-inset clipPath', () => {
+    expect(parseInsetClipPathForScale('circle(50%)')).toBeNull();
+    expect(parseInsetClipPathForScale('polygon(0 0, 100% 0, 100% 100%)')).toBeNull();
+    expect(parseInsetClipPathForScale('')).toBeNull();
+  });
+
+  it('returns null for malformed inset', () => {
+    expect(parseInsetClipPathForScale('inset(10 20 30 40)')).toBeNull(); // no %
+    expect(parseInsetClipPathForScale('inset(10% 20% 30%)')).toBeNull(); // only 3 values
+    expect(parseInsetClipPathForScale('inset()')).toBeNull();
+  });
+
+  it('returns null when visible area has zero or negative size', () => {
+    // left + right >= 100 => visibleW <= 0
+    expect(parseInsetClipPathForScale('inset(0% 50% 0% 50%)')).toBeNull();
+    // top + bottom >= 100 => visibleH <= 0
+    expect(parseInsetClipPathForScale('inset(50% 0% 50% 0%)')).toBeNull();
+  });
+
+  it('handles decimal percentages', () => {
+    const result = parseInsetClipPathForScale('inset(12.5% 25.5% 12.5% 24.5%)');
+    expect(result).not.toBeNull();
+    const visibleW = 100 - 24.5 - 25.5;
+    const visibleH = 100 - 12.5 - 12.5;
+    expect(result!.scaleX).toBeCloseTo(100 / visibleW);
+    expect(result!.scaleY).toBeCloseTo(100 / visibleH);
+  });
+});
+
+describe('formatInsetClipPathTransform', () => {
+  it('returns CSS transform string for valid inset', () => {
+    const result = formatInsetClipPathTransform('inset(10% 20% 30% 40%)');
+    expect(result).toBeDefined();
+    expect(result).toContain('transform-origin: 0 0');
+    expect(result).toContain('transform: translate(');
+    expect(result).toContain('%) scale(');
+    expect(result).toMatch(/translate\([-\d.]+%,\s*[-\d.]+%\)/);
+    expect(result).toMatch(/scale\([-\d.]+,\s*[-\d.]+\)/);
+  });
+
+  it('returns undefined for invalid clipPath', () => {
+    expect(formatInsetClipPathTransform('circle(50%)')).toBeUndefined();
+    expect(formatInsetClipPathTransform('')).toBeUndefined();
+  });
+
+  it('output can be applied as inline style', () => {
+    const result = formatInsetClipPathTransform('inset(0% 0% 0% 0%)');
+    expect(result).toBe('transform-origin: 0 0; transform: translate(0%, 0%) scale(1, 1);');
+  });
+});

packages/layout-engine/contracts/src/clip-path-inset.ts

@@ -0,0 +1,49 @@
+/**
+ * Shared utilities for inset(top% right% bottom% left%) clip-path (e.g. from DOCX a:srcRect).
+ * Used by both the layout-engine painters and super-editor image extension so the same
+ * scale/translate math is applied everywhere.
+ */
+
+/** Result of parsing an inset() clip-path for scale/translate. */
+export type InsetClipPathScale = {
+  scaleX: number;
+  scaleY: number;
+  translateX: number;
+  translateY: number;
+};
+
+/**
+ * Parses inset(top% right% bottom% left%) from a clipPath string and returns scale + translate
+ * so the visible clipped portion fills the container and is aligned to top-left.
+ *
+ * @param clipPath - e.g. "inset(10% 20% 30% 40%)"
+ * @returns Scale and translate values, or null if not a valid inset()
+ */
+export function parseInsetClipPathForScale(clipPath: string): InsetClipPathScale | null {
+  const m = clipPath.trim().match(/^inset\(\s*([\d.]+)%\s+([\d.]+)%\s+([\d.]+)%\s+([\d.]+)%\s*\)$/);
+  if (!m) return null;
+  const top = Number(m[1]);
+  const right = Number(m[2]);
+  const bottom = Number(m[3]);
+  const left = Number(m[4]);
+  const visibleW = 100 - left - right;
+  const visibleH = 100 - top - bottom;
+  if (visibleW <= 0 || visibleH <= 0) return null;
+  const scaleX = 100 / visibleW;
+  const scaleY = 100 / visibleH;
+  const translateX = -left * scaleX;
+  const translateY = -top * scaleY;
+  return { scaleX, scaleY, translateX, translateY };
+}
+
+/**
+ * Builds the CSS transform-origin and transform string from a parsed inset scale result.
+ *
+ * @param clipPath - e.g. "inset(10% 20% 30% 40%)"
+ * @returns CSS fragment: "transform-origin: 0 0; transform: translate(...) scale(...);"
+ */
+export function formatInsetClipPathTransform(clipPath: string): string | undefined {
+  const scale = parseInsetClipPathForScale(clipPath);
+  if (!scale) return undefined;
+  return `transform-origin: 0 0; transform: translate(${scale.translateX}%, ${scale.translateY}%) scale(${scale.scaleX}, ${scale.scaleY});`;
+}

packages/layout-engine/contracts/src/index.ts

@@ -16,6 +16,12 @@ export {
   type CalculateJustifySpacingParams,
 } from './justify-utils.js';
 
+export {
+  parseInsetClipPathForScale,
+  formatInsetClipPathTransform,
+  type InsetClipPathScale,
+} from './clip-path-inset.js';
+
 export { computeFragmentPmRange, computeLinePmRange, type LinePmRange } from './pm-range.js';
 /** Inline field annotation metadata extracted from w:sdt nodes. */
 export type FieldAnnotationMetadata = {
@@ -267,6 +273,8 @@ export type ImageRun = {
   alt?: string;
   /** Image title (tooltip). */
   title?: string;
+  /** Clip-path value for cropped images. */
+  clipPath?: string;
 
   /**
    * Spacing around the image (from DOCX distT/distB/distL/distR attributes).
@@ -702,6 +710,7 @@ export type ShapeGroupImageChild = {
   attrs: PositionedDrawingGeometry & {
     src: string;
     alt?: string;
+    clipPath?: string;
     imageId?: string;
     imageName?: string;
   };

packages/layout-engine/painters/dom/src/index.test.ts

@@ -4528,6 +4528,77 @@ describe('DomPainter', () => {
       expect(img).toBeNull();
     });
 
+    it('renders cropped inline image with clipPath in wrapper (overflow hidden, img with clip-path and transform)', () => {
+      const clipPath = 'inset(10% 20% 30% 40%)';
+      const imageBlock: FlowBlock = {
+        kind: 'paragraph',
+        id: 'img-block',
+        runs: [
+          {
+            kind: 'image',
+            src: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==',
+            width: 80,
+            height: 60,
+            clipPath,
+          },
+        ],
+      };
+
+      const imageMeasure: Measure = {
+        kind: 'paragraph',
+        lines: [
+          {
+            fromRun: 0,
+            fromChar: 0,
+            toRun: 0,
+            toChar: 0,
+            width: 80,
+            ascent: 60,
+            descent: 0,
+            lineHeight: 60,
+          },
+        ],
+        totalHeight: 60,
+      };
+
+      const imageLayout: Layout = {
+        pageSize: { w: 400, h: 500 },
+        pages: [
+          {
+            number: 1,
+            fragments: [
+              {
+                kind: 'para',
+                blockId: 'img-block',
+                fromLine: 0,
+                toLine: 1,
+                x: 0,
+                y: 0,
+                width: 80,
+              },
+            ],
+          },
+        ],
+      };
+
+      const painter = createDomPainter({ blocks: [imageBlock], measures: [imageMeasure] });
+      painter.paint(imageLayout, mount);
+
+      const wrapper = mount.querySelector('.superdoc-inline-image-clip-wrapper');
+      expect(wrapper).toBeTruthy();
+      expect((wrapper as HTMLElement).style.overflow).toBe('hidden');
+      expect((wrapper as HTMLElement).style.width).toBe('80px');
+      expect((wrapper as HTMLElement).style.height).toBe('60px');
+
+      const img = wrapper?.querySelector('img');
+      expect(img).toBeTruthy();
+      expect((img as HTMLElement).style.clipPath).toBe(clipPath);
+      expect((img as HTMLElement).style.transformOrigin).toBe('0 0');
+      expect((img as HTMLElement).style.transform).toMatch(
+        /translate\([-\d.]+%,\s*[-\d.]+%\)\s*scale\([-\d.]+,\s*[-\d.]+\)/,
+      );
+    });
+
     it('returns null for data URLs exceeding MAX_DATA_URL_LENGTH (10MB)', () => {
       // Create a data URL that exceeds 10MB
       const largeBase64 = 'A'.repeat(10 * 1024 * 1024 + 1);