From 1bf1084f2b10c3b47fd1a588d85d21ed0eb41d0c Mon Sep 17 00:00:00 2001
From: Lorry Tar Creator <lorry-tar-importer@lorry>
Date: Tue, 27 Jun 2017 06:07:23 +0000
Subject: webkitgtk-2.16.5

---
 Source/WebCore/page/FrameSnapshotting.cpp | 41 +++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 5 deletions(-)

(limited to 'Source/WebCore/page/FrameSnapshotting.cpp')

diff --git a/Source/WebCore/page/FrameSnapshotting.cpp b/Source/WebCore/page/FrameSnapshotting.cpp
index 495406b82..3d34cd929 100644
--- a/Source/WebCore/page/FrameSnapshotting.cpp
+++ b/Source/WebCore/page/FrameSnapshotting.cpp
@@ -32,12 +32,15 @@
 #include "FrameSnapshotting.h"
 
 #include "Document.h"
+#include "FloatRect.h"
 #include "Frame.h"
 #include "FrameSelection.h"
 #include "FrameView.h"
+#include "GraphicsContext.h"
 #include "ImageBuffer.h"
 #include "Page.h"
 #include "RenderObject.h"
+#include "Settings.h"
 
 namespace WebCore {
 
@@ -65,6 +68,12 @@ struct ScopedFramePaintingState {
 };
 
 std::unique_ptr<ImageBuffer> snapshotFrameRect(Frame& frame, const IntRect& imageRect, SnapshotOptions options)
+{
+    Vector<FloatRect> clipRects;
+    return snapshotFrameRectWithClip(frame, imageRect, clipRects, options);
+}
+
+std::unique_ptr<ImageBuffer> snapshotFrameRectWithClip(Frame& frame, const IntRect& imageRect, Vector<FloatRect>& clipRects, SnapshotOptions options)
 {
     if (!frame.page())
         return nullptr;
@@ -86,14 +95,28 @@ std::unique_ptr<ImageBuffer> snapshotFrameRect(Frame& frame, const IntRect& imag
         paintBehavior |= PaintBehaviorForceBlackText;
     if (options & SnapshotOptionsPaintSelectionOnly)
         paintBehavior |= PaintBehaviorSelectionOnly;
+    if (options & SnapshotOptionsPaintSelectionAndBackgroundsOnly)
+        paintBehavior |= PaintBehaviorSelectionAndBackgroundsOnly;
 
     // Other paint behaviors are set by paintContentsForSnapshot.
     frame.view()->setPaintBehavior(paintBehavior);
 
-    std::unique_ptr<ImageBuffer> buffer = ImageBuffer::create(imageRect.size(), frame.page()->deviceScaleFactor(), ColorSpaceDeviceRGB);
+    float scaleFactor = frame.page()->deviceScaleFactor();
+
+    if (frame.settings().delegatesPageScaling())
+        scaleFactor *= frame.page()->pageScaleFactor();
+
+    std::unique_ptr<ImageBuffer> buffer = ImageBuffer::create(imageRect.size(), Unaccelerated, scaleFactor);
     if (!buffer)
         return nullptr;
-    buffer->context()->translate(-imageRect.x(), -imageRect.y());
+    buffer->context().translate(-imageRect.x(), -imageRect.y());
+
+    if (!clipRects.isEmpty()) {
+        Path clipPath;
+        for (auto& rect : clipRects)
+            clipPath.addRect(rect);
+        buffer->context().clipPath(clipPath);
+    }
 
     frame.view()->paintContentsForSnapshot(buffer->context(), imageRect, shouldIncludeSelection, coordinateSpace);
     return buffer;
@@ -101,11 +124,19 @@ std::unique_ptr<ImageBuffer> snapshotFrameRect(Frame& frame, const IntRect& imag
 
 std::unique_ptr<ImageBuffer> snapshotSelection(Frame& frame, SnapshotOptions options)
 {
-    if (!frame.selection().isRange())
+    auto& selection = frame.selection();
+
+    if (!selection.isRange())
+        return nullptr;
+
+    FloatRect selectionBounds = selection.selectionBounds();
+
+    // It is possible for the selection bounds to be empty; see https://bugs.webkit.org/show_bug.cgi?id=56645.
+    if (selectionBounds.isEmpty())
         return nullptr;
 
     options |= SnapshotOptionsPaintSelectionOnly;
-    return snapshotFrameRect(frame, enclosingIntRect(frame.selection().bounds()), options);
+    return snapshotFrameRect(frame, enclosingIntRect(selectionBounds), options);
 }
 
 std::unique_ptr<ImageBuffer> snapshotNode(Frame& frame, Node& node)
@@ -119,7 +150,7 @@ std::unique_ptr<ImageBuffer> snapshotNode(Frame& frame, Node& node)
     frame.view()->setNodeToDraw(&node);
 
     LayoutRect topLevelRect;
-    return snapshotFrameRect(frame, pixelSnappedIntRect(node.renderer()->paintingRootRect(topLevelRect)));
+    return snapshotFrameRect(frame, snappedIntRect(node.renderer()->paintingRootRect(topLevelRect)));
 }
 
 } // namespace WebCore
-- 
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