webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 90 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/texmap/ClipStack.cpp b/Source/WebCore/platform/graphics/texmap/ClipStack.cpp
new file mode 100644
index 000000000..11a00bc8a
--- /dev/null
+++ b/Source/WebCore/platform/graphics/texmap/ClipStack.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2012 Adobe Systems Incorporated
+ * Copyright (C) 2012, 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.
+ */
+
+#include "config.h"
+#include "ClipStack.h"
+
+#include "GraphicsContext3D.h"
+
+namespace WebCore {
+
+void ClipStack::push()
+{
+    clipStack.append(clipState);
+    clipStateDirty = true;
+}
+
+void ClipStack::pop()
+{
+    if (clipStack.isEmpty())
+        return;
+    clipState = clipStack.last();
+    clipStack.removeLast();
+    clipStateDirty = true;
+}
+
+void ClipStack::reset(const IntRect& rect, ClipStack::YAxisMode mode)
+{
+    clipStack.clear();
+    size = rect.size();
+    yAxisMode = mode;
+    clipState = State(rect);
+    clipStateDirty = true;
+}
+
+void ClipStack::intersect(const IntRect& rect)
+{
+    clipState.scissorBox.intersect(rect);
+    clipStateDirty = true;
+}
+
+void ClipStack::setStencilIndex(int stencilIndex)
+{
+    clipState.stencilIndex = stencilIndex;
+    clipStateDirty = true;
+}
+
+void ClipStack::apply(GraphicsContext3D& context)
+{
+    if (clipState.scissorBox.isEmpty())
+        return;
+
+    context.scissor(clipState.scissorBox.x(),
+        (yAxisMode == YAxisMode::Inverted) ? size.height() - clipState.scissorBox.maxY() : clipState.scissorBox.y(),
+        clipState.scissorBox.width(), clipState.scissorBox.height());
+    context.stencilOp(GraphicsContext3D::KEEP, GraphicsContext3D::KEEP, GraphicsContext3D::KEEP);
+    context.stencilFunc(GraphicsContext3D::EQUAL, clipState.stencilIndex - 1, clipState.stencilIndex - 1);
+    if (clipState.stencilIndex == 1)
+        context.disable(GraphicsContext3D::STENCIL_TEST);
+    else
+        context.enable(GraphicsContext3D::STENCIL_TEST);
+}
+
+void ClipStack::applyIfNeeded(GraphicsContext3D& context)
+{
+    if (!clipStateDirty)
+        return;
+
+    clipStateDirty = false;
+    apply(context);
+}
+
+} // namespace WebCore