webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 74 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/texmap/ClipStack.h b/Source/WebCore/platform/graphics/texmap/ClipStack.h
new file mode 100644
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+++ b/Source/WebCore/platform/graphics/texmap/ClipStack.h
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+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2015, 2016 Igalia S.L.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef ClipStack_h
+#define ClipStack_h
+
+#include "IntRect.h"
+#include "IntSize.h"
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class GraphicsContext3D;
+
+class ClipStack {
+public:
+    struct State {
+        State(const IntRect& scissors = IntRect(), int stencil = 1)
+            : scissorBox(scissors)
+            , stencilIndex(stencil)
+        { }
+
+        IntRect scissorBox;
+        int stencilIndex;
+    };
+
+    // Y-axis should be inverted only when painting into the window.
+    enum class YAxisMode {
+        Default,
+        Inverted,
+    };
+
+    void push();
+    void pop();
+    State& current() { return clipState; }
+
+    void reset(const IntRect&, YAxisMode);
+    void intersect(const IntRect&);
+    void setStencilIndex(int);
+    int getStencilIndex() const { return clipState.stencilIndex; }
+
+    void apply(GraphicsContext3D&);
+    void applyIfNeeded(GraphicsContext3D&);
+
+    bool isCurrentScissorBoxEmpty() const { return clipState.scissorBox.isEmpty(); }
+
+private:
+    Vector<State> clipStack;
+    State clipState;
+    IntSize size;
+    bool clipStateDirty { false };
+    YAxisMode yAxisMode { YAxisMode::Default };
+};
+
+} // namespace WebCore
+
+#endif // ClipStack_h