Add PPT export test that converts SVG files to PPTX via PAGX roundtrip.

Author: OnionsYu

test/src/PAGXPPTTest.cpp

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+/////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//  Tencent is pleased to support the open source community by making libpag available.
+//
+//  Copyright (C) 2026 Tencent. All rights reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+//  except in compliance with the License. You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  unless required by applicable law or agreed to in writing, software distributed under the
+//  license is distributed on an "as is" basis, without warranties or conditions of any kind,
+//  either express or implied. see the license for the specific language governing permissions
+//  and limitations under the license.
+//
+/////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifdef PAG_BUILD_PPT
+
+#include <algorithm>
+#include <filesystem>
+#include <fstream>
+#include "pagx/PAGXExporter.h"
+#include "pagx/PAGXImporter.h"
+#include "pagx/PPTExporter.h"
+#include "pagx/SVGImporter.h"
+#include "utils/ProjectPath.h"
+#include "utils/TestUtils.h"
+
+namespace pag {
+
+/**
+ * Read all SVG files from resources/svg, convert each to PAGX, then export to PPTX.
+ */
+PAGX_TEST(PAGXPPTTest, PPTExport_FromSVG) {
+  std::string svgDir = ProjectPath::Absolute("resources/svg");
+  std::vector<std::string> svgFiles;
+
+  for (const auto& entry : std::filesystem::directory_iterator(svgDir)) {
+    if (entry.path().extension() == ".svg") {
+      svgFiles.push_back(entry.path().string());
+    }
+  }
+  std::sort(svgFiles.begin(), svgFiles.end());
+  ASSERT_FALSE(svgFiles.empty()) << "No SVG files found in resources/svg";
+
+  auto outDir = ProjectPath::Absolute("test/out/PAGXPPTTest");
+  if (!std::filesystem::exists(outDir)) {
+    std::filesystem::create_directories(outDir);
+  }
+
+  for (const auto& svgPath : svgFiles) {
+    std::string baseName = std::filesystem::path(svgPath).stem().string();
+
+    auto doc = pagx::SVGImporter::Parse(svgPath);
+    if (!doc) {
+      continue;
+    }
+    if (doc->width <= 0 || doc->height <= 0) {
+      continue;
+    }
+
+    auto pagxXml = pagx::PAGXExporter::ToXML(*doc);
+    ASSERT_FALSE(pagxXml.empty()) << baseName << " PAGX export failed";
+
+    auto pagxPath = outDir + "/" + baseName + ".pagx";
+    {
+      std::ofstream file(pagxPath, std::ios::binary);
+      ASSERT_TRUE(file.good()) << "Failed to write " << pagxPath;
+      file.write(pagxXml.data(), static_cast<std::streamsize>(pagxXml.size()));
+    }
+
+    auto reimported = pagx::PAGXImporter::FromFile(pagxPath);
+    ASSERT_NE(reimported, nullptr) << baseName << " PAGX re-import failed";
+
+    auto pptxPath = outDir + "/" + baseName + ".pptx";
+    ASSERT_TRUE(pagx::PPTExporter::ToFile(*reimported, pptxPath))
+        << baseName << " PPT export failed";
+    EXPECT_TRUE(std::filesystem::exists(pptxPath));
+    EXPECT_GT(std::filesystem::file_size(pptxPath), 0u) << baseName << " PPTX file is empty";
+  }
+}
+
+}  // namespace pag
+
+#endif