Add QPowerPoint slide size support

src/io/powerPointOffice.ts

@@ -1,13 +1,15 @@
-import type { Slide, SlideImage, SlideListStyle, SlideTextAlign } from "../types";
+import type { Slide, SlideImage, SlideListStyle, SlideSizeId, SlideTextAlign } from "../types";
 import { officeTitleFromFileName, PPTX_MIME_TYPE, readOfficeFileAsArrayBuffer } from "./fileHelpers";
 
 export interface ImportedPowerPointDeck {
   title: string;
+  slideSize?: SlideSizeId;
   slides: Slide[];
 }
 
 export interface ExportablePowerPointDeck {
   title: string;
+  slideSize?: SlideSizeId;
   slides: Slide[];
 }
 
@@ -47,6 +49,10 @@ const imageRelationshipType = "http://schemas.openxmlformats.org/officeDocument/
 const hyperlinkRelationshipType = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink";
 const emuPerInch = 914400;
 const slideTransitions = ["fade", "push", "wipe"] as const;
+const slideSizeLayouts: Record<SlideSizeId, { width: number; height: number; cx: number; cy: number; pptxLayout: string }> = {
+  wide: { width: 13.333, height: 7.5, cx: 12192000, cy: 6858000, pptxLayout: "LAYOUT_WIDE" },
+  standard: { width: 10, height: 7.5, cx: 9144000, cy: 6858000, pptxLayout: "LAYOUT_4x3" }
+};
 const themeColors: Record<Slide["theme"], { background: string; title: string; subtitle: string }> = {
   classic: { background: "FFFFFF", title: "202124", subtitle: "3C4043" },
   ocean: { background: "EAF6FF", title: "075985", subtitle: "0F766E" },
@@ -65,6 +71,7 @@ export async function importPptxFile(file: File): Promise<ImportedPowerPointDeck
   const presentationXml = await readOptionalParsedXml(zip, parser, "ppt/presentation.xml");
   const presentationRelationshipsXml = await readOptionalParsedXml(zip, parser, "ppt/_rels/presentation.xml.rels");
   const slidePaths = listSlidePaths(zip, presentationXml, presentationRelationshipsXml);
+  const slideSize = presentationSlideSize(presentationXml);
 
   if (slidePaths.length === 0) {
     throw new Error("В файле PowerPoint не найдены слайды.");
@@ -126,7 +133,7 @@ export async function importPptxFile(file: File): Promise<ImportedPowerPointDeck
     })
   );
 
-  return { title, slides };
+  return { title, ...(slideSize ? { slideSize } : {}), slides };
 }
 
 export async function exportPptxBlob(deck: ExportablePowerPointDeck): Promise<Blob> {
@@ -147,8 +154,10 @@ export async function exportPptxBlob(deck: ExportablePowerPointDeck): Promise<Bl
     };
     write: (options: { outputType: "blob" | "arraybuffer" }) => Promise<Blob | ArrayBuffer>;
   };
+  const slideSize = normalizedSlideSizeId(deck.slideSize);
+  const slideLayout = slideSizeLayouts[slideSize];
 
-  pptx.layout = "LAYOUT_WIDE";
+  pptx.layout = slideLayout.pptxLayout;
   pptx.author = "QOffice";
   pptx.company = "QOffice";
   pptx.subject = "Экспорт QPowerPoint";
@@ -196,7 +205,7 @@ export async function exportPptxBlob(deck: ExportablePowerPointDeck): Promise<Bl
     slide.addText(sourceSlide.title || "Без заголовка", {
       x: 0.7,
       y: 0.65,
-      w: 11.9,
+      w: Math.max(1, slideLayout.width - 1.4),
       h: 0.75,
       fontFace: titleFontFamily,
       fontSize: titleFontSize,
@@ -213,8 +222,8 @@ export async function exportPptxBlob(deck: ExportablePowerPointDeck): Promise<Bl
     slide.addText(sourceSlide.subtitle || "", {
       x: 0.75,
       y: 1.65,
-      w: 11.5,
-      h: 4.35,
+      w: Math.max(1, slideLayout.width - 1.5),
+      h: Math.max(1, slideLayout.height - 3.15),
       fontFace: subtitleFontFamily,
       fontSize: subtitleFontSize,
       ...(subtitleAlign ? { align: subtitleAlign } : {}),
@@ -411,6 +420,19 @@ export function presentationSlidePaths(presentationXml: unknown, presentationRel
   return slideIds.map((id) => relationshipTargets[id]).filter((target): target is string => Boolean(target));
 }
 
+export function presentationSlideSize(presentationXml: unknown): SlideSizeId | undefined {
+  const slideSize = childRecord(childRecord(presentationXml, "presentation"), "sldSz");
+  const cx = numberAttribute(slideSize, "cx");
+  const cy = numberAttribute(slideSize, "cy");
+  if (!cx || !cy) {
+    return undefined;
+  }
+
+  return Object.entries(slideSizeLayouts).find(([, layout]) => Math.abs(cx - layout.cx) <= 5000 && Math.abs(cy - layout.cy) <= 5000)?.[0] as
+    | SlideSizeId
+    | undefined;
+}
+
 export function relationshipTargetsById(relationshipsXml: unknown, type?: string, sourcePartPath = "ppt/presentation.xml"): Record<string, string> {
   const relationships = childRecord(relationshipsXml, "Relationships");
   const targets: Record<string, string> = {};
@@ -467,6 +489,10 @@ export function normalizeWhitespace(value: string): string {
   return value.replace(/\s+/g, " ").trim();
 }
 
+function normalizedSlideSizeId(value?: SlideSizeId): SlideSizeId {
+  return value === "standard" ? "standard" : "wide";
+}
+
 function normalizeTextWithLineBreaks(value: string): string {
   return value
     .split("\n")