Issue #118: Move compiler and draw space controller

Pdf4QtLibCore/sources/pdfwidgetsnapshot.h

@@ -0,0 +1,45 @@
+//    Copyright (C) 2023 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfglobal.h"
+
+#include <QRectF>
+#include <QTransform>
+
+namespace pdf
+{
+class PDFPrecompiledPage;
+
+/// Snapshot for current widget viewable items.
+struct PDFWidgetSnapshot
+{
+    struct SnapshotItem
+    {
+        PDFInteger pageIndex = -1;  ///< Index of page
+        QRectF rect;                ///< Page rectangle on viewport
+        QTransform pageToDeviceMatrix;             ///< Transforms page coordinates to widget coordinates
+        const PDFPrecompiledPage* compiledPage = nullptr; ///< Compiled page (can be nullptr)
+    };
+
+    bool hasPage(PDFInteger pageIndex) const { return getPageSnapshot(pageIndex) != nullptr; }
+    const SnapshotItem* getPageSnapshot(PDFInteger pageIndex) const;
+
+    using SnapshotItems = std::vector<SnapshotItem>;
+    SnapshotItems items;
+};
+
+}   // namespace pdf