1 files changed, 115 insertions, 0 deletions
diff --git a/src/extension/internal/pdfinput/pdf-utils.cpp b/src/extension/internal/pdfinput/pdf-utils.cpp
new file mode 100644
index 0000000..05c4ac5
--- /dev/null
+++ b/src/extension/internal/pdfinput/pdf-utils.cpp
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Utility structures and functions for pdf parsing.
+ *//*
+ * 
+ * Copyright (C) 2023 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glib.h>
+#include "pdf-utils.h"
+
+#include "poppler-utils.h"
+
+//------------------------------------------------------------------------
+// ClipHistoryEntry
+//------------------------------------------------------------------------
+
+ClipHistoryEntry::ClipHistoryEntry(GfxPath *clipPathA, GfxClipType clipTypeA)
+    : saved(nullptr)
+    , clipPath((clipPathA) ? clipPathA->copy() : nullptr)
+    , clipType(clipTypeA)
+{}
+
+ClipHistoryEntry::~ClipHistoryEntry()
+{
+    if (clipPath) {
+        delete clipPath;
+        clipPath = nullptr;
+    }
+}
+
+void ClipHistoryEntry::setClip(GfxState *state, GfxClipType clipTypeA, bool bbox)
+{
+    const GfxPath *clipPathA = state->getPath();
+
+    if (clipPath) {
+        if (copied) {
+            // Free previously copied clip path.
+            delete clipPath;
+        } else {
+            // This indicates a bad use of the ClipHistory API
+            g_error("Clip path is already set!");
+            return;
+        }
+    }
+
+    cleared = false;
+    copied = false;
+    if (clipPathA) {
+        affine = stateToAffine(state);
+        clipPath = clipPathA->copy();
+        clipType = clipTypeA;
+        is_bbox = bbox;
+    } else {
+        affine = Geom::identity();
+        clipPath = nullptr;
+        clipType = clipNormal;
+        is_bbox = false;
+    }
+}
+
+/**
+ * Create a new clip-history, appending it to the stack.
+ *
+ * If cleared is set to true, it will not remember the current clipping path.
+ */
+ClipHistoryEntry *ClipHistoryEntry::save(bool cleared)
+{
+    ClipHistoryEntry *newEntry = new ClipHistoryEntry(this, cleared);
+    newEntry->saved = this;
+    return newEntry;
+}
+
+ClipHistoryEntry *ClipHistoryEntry::restore()
+{
+    ClipHistoryEntry *oldEntry;
+
+    if (saved) {
+        oldEntry = saved;
+        saved = nullptr;
+        delete this; // TODO really should avoid deleting from inside.
+    } else {
+        oldEntry = this;
+    }
+
+    return oldEntry;
+}
+
+ClipHistoryEntry::ClipHistoryEntry(ClipHistoryEntry *other, bool cleared)
+{
+    if (other && other->clipPath) {
+        this->affine = other->affine;
+        this->clipPath = other->clipPath->copy();
+        this->clipType = other->clipType;
+        this->cleared = cleared;
+        this->copied = true;
+        this->is_bbox = other->is_bbox;
+    } else {
+        this->affine = Geom::identity();
+        this->clipPath = nullptr;
+        this->clipType = clipNormal;
+        this->cleared = false;
+        this->copied = false;
+        this->is_bbox = false;
+    }
+    saved = nullptr;
+}
+
+Geom::Rect getRect(_POPPLER_CONST PDFRectangle *box)
+{
+    return Geom::Rect(box->x1, box->y1, box->x2, box->y2);
+}
+