Preserve QPowerPoint slide backgrounds

src/io/powerPointOffice.test.ts

@@ -201,6 +201,45 @@ describe("powerPointOffice helpers", () => {
     expect(mediaFiles.length).toBeGreaterThan(0);
   });
 
+  it("импортирует и экспортирует пользовательский цвет фона слайда", async () => {
+    const zip = new JSZip();
+    zip.file(
+      "ppt/presentation.xml",
+      `<p:presentation xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><p:sldIdLst><p:sldId id="256" r:id="rId1"/></p:sldIdLst></p:presentation>`
+    );
+    zip.file(
+      "ppt/_rels/presentation.xml.rels",
+      `<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="slides/slide1.xml"/></Relationships>`
+    );
+    zip.file("ppt/slides/slide1.xml", slideXmlWithBackground("Фон слайда", "FCE4D6"));
+
+    const importedBlob = await zip.generateAsync({
+      type: "blob",
+      mimeType: "application/vnd.openxmlformats-officedocument.presentationml.presentation"
+    });
+    const imported = await importPptxFile(new File([importedBlob], "Фон.pptx", { type: importedBlob.type }));
+
+    expect(imported.slides[0].backgroundColor).toBe("FCE4D6");
+
+    const exportedBlob = await exportPptxBlob({
+      title: "Фон.pptx",
+      slides: [
+        {
+          id: "slide-1",
+          title: "Фон слайда",
+          subtitle: "",
+          notes: "",
+          theme: "classic",
+          backgroundColor: "FCE4D6"
+        }
+      ]
+    });
+    const exportedZip = await JSZip.loadAsync(await exportedBlob.arrayBuffer());
+    const exportedSlideXml = await exportedZip.file("ppt/slides/slide1.xml")?.async("string");
+
+    expect(exportedSlideXml).toContain("FCE4D6");
+  });
+
   it("нормализует пробелы в импортированном тексте", () => {
     expect(normalizeWhitespace("  Строка\tс \n пробелами  ")).toBe("Строка с пробелами");
   });
@@ -212,6 +251,10 @@ function slideXml(...texts: string[]) {
     .join("")}</p:spTree></p:cSld></p:sld>`;
 }
 
+function slideXmlWithBackground(title: string, color: string) {
+  return `<p:sld xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><p:cSld><p:bg><p:bgPr><a:solidFill><a:srgbClr val="${color}"/></a:solidFill></p:bgPr></p:bg><p:spTree><p:sp><p:txBody><a:p><a:r><a:t>${title}</a:t></a:r></a:p></p:txBody></p:sp></p:spTree></p:cSld></p:sld>`;
+}
+
 function slideXmlWithPicture(title: string) {
   return `<p:sld xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><p:cSld><p:spTree><p:sp><p:txBody><a:p><a:r><a:t>${title}</a:t></a:r></a:p></p:txBody></p:sp><p:pic><p:nvPicPr><p:cNvPr id="4" name="Picture 1" descr="Логотип"/></p:nvPicPr><p:blipFill><a:blip r:embed="rIdImage"/></p:blipFill><p:spPr><a:xfrm><a:off x="914400" y="1828800"/><a:ext cx="2743200" cy="1371600"/></a:xfrm></p:spPr></p:pic></p:spTree></p:cSld></p:sld>`;
 }