Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 157 insertions, 0 deletions

diff --git a/layout/svg/ISVGDisplayableFrame.h b/layout/svg/ISVGDisplayableFrame.h
new file mode 100644
index 0000000000..90446561a1
--- /dev/null
+++ b/layout/svg/ISVGDisplayableFrame.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef LAYOUT_SVG_ISVGDISPLAYABLEFRAME_H_
+#define LAYOUT_SVG_ISVGDISPLAYABLEFRAME_H_
+
+#include "gfxMatrix.h"
+#include "gfxPoint.h"
+#include "gfxRect.h"
+#include "nsQueryFrame.h"
+#include "nsRect.h"
+#include "mozilla/gfx/MatrixFwd.h"
+
+class gfxContext;
+class nsIFrame;
+
+namespace mozilla {
+class SVGAnimatedLengthList;
+class SVGAnimatedNumberList;
+class SVGBBox;
+class SVGLengthList;
+class SVGNumberList;
+class SVGUserUnitList;
+
+namespace image {
+struct imgDrawingParams;
+}  // namespace image
+
+/**
+ * This class is used for elements that can be part of a directly displayable
+ * section of a document.  This includes SVGGeometryFrame and SVGGFrame.
+ * (Even though the latter doesn't display anything itself, if it contains
+ * SVGGeometryFrame descendants it is can still be part of a displayable
+ * section of a document)  This class is not used for elements that can never
+ * display directly, including SVGGradientFrame and SVGPatternFrame.  (The
+ * latter may contain displayable content, but it and its content are never
+ * *directly* displayed in a document.  It can only end up being displayed by
+ * means of a reference from other content.)
+ *
+ * Note specifically that SVG frames that inherit SVGContainerFrame do *not*
+ * implement this class (only those that inherit SVGDisplayContainerFrame
+ * do.)
+ */
+class ISVGDisplayableFrame : public nsQueryFrame {
+ public:
+  using imgDrawingParams = image::imgDrawingParams;
+
+  NS_DECL_QUERYFRAME_TARGET(ISVGDisplayableFrame)
+
+  /**
+   * Paint this frame.
+   *
+   * SVG is painted using a combination of display lists (trees of
+   * nsDisplayItem built by BuildDisplayList() implementations) and recursive
+   * PaintSVG calls.  SVG frames with the NS_FRAME_IS_NONDISPLAY bit set are
+   * always painted using recursive PaintSVG calls since display list painting
+   * would provide no advantages (they wouldn't be retained for invalidation).
+   * Displayed SVG is normally painted via a display list tree created under
+   * SVGOuterSVGFrame::BuildDisplayList, unless the
+   * svg.display-lists.painting.enabled pref has been set to false by the user
+   * in which case it is done via an SVGOuterSVGFrame::PaintSVG() call that
+   * recurses over the entire SVG frame tree.  In future we may use PaintSVG()
+   * calls on SVG container frames to avoid display list construction when it
+   * is expensive and unnecessary (see bug 934411).
+   *
+   * @param aTransform The transform that has to be multiplied onto the
+   *   DrawTarget in order for drawing to be in this frame's SVG user space.
+   *   Implementations of this method should avoid multiplying aTransform onto
+   *   the DrawTarget when possible and instead just pass a transform down to
+   *   their children.  This is preferable because changing the transform is
+   *   very expensive for certain DrawTarget backends so it is best to minimize
+   *   the number of transform changes.
+   *
+   * @param aImgParams imagelib parameters that may be used when painting
+   *   feImage.
+   *
+   * @param aDirtyRect The area being redrawn, in frame offset pixel
+   *   coordinates.
+   */
+  virtual void PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
+                        imgDrawingParams& aImgParams,
+                        const nsIntRect* aDirtyRect = nullptr) = 0;
+
+  /**
+   * Returns the frame that should handle pointer events at aPoint.  aPoint is
+   * expected to be in the SVG user space of the frame on which this method is
+   * called.  The frame returned may be the frame on which this method is
+   * called, any of its descendants or else nullptr.
+   */
+  virtual nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) = 0;
+
+  // Called on SVG child frames (except NS_FRAME_IS_NONDISPLAY frames)
+  // to update and then invalidate their cached bounds. This method is not
+  // called until after the SVGOuterSVGFrame has had its initial reflow
+  // (i.e. once the SVG viewport dimensions are known). It should also only
+  // be called by SVGOuterSVGFrame during its reflow.
+  virtual void ReflowSVG() = 0;
+
+  // Flags to pass to NotifySVGChange:
+  //
+  // TRANSFORM_CHANGED:
+  //   the current transform matrix for this frame has changed
+  // COORD_CONTEXT_CHANGED:
+  //   the dimensions of this frame's coordinate context has changed (percentage
+  //   lengths must be reevaluated)
+  // FULL_ZOOM_CHANGED:
+  //   the page's zoom level has changed
+  enum SVGChangedFlags {
+    TRANSFORM_CHANGED = 0x01,
+    COORD_CONTEXT_CHANGED = 0x02,
+    FULL_ZOOM_CHANGED = 0x04
+  };
+  /**
+   * This is called on a frame when there has been a change to one of its
+   * ancestors that might affect the frame too. SVGChangedFlags are passed
+   * to indicate what changed.
+   *
+   * Implementations do not need to invalidate, since the caller will
+   * invalidate the entire area of the ancestor that changed. However, they
+   * may need to update their bounds.
+   */
+  virtual void NotifySVGChanged(uint32_t aFlags) = 0;
+
+  /**
+   * Get this frame's contribution to the rect returned by a GetBBox() call
+   * that occurred either on this element, or on one of its ancestors.
+   *
+   * SVG defines an element's bbox to be the element's fill bounds in the
+   * userspace established by that element. By allowing callers to pass in the
+   * transform from the userspace established by this element to the userspace
+   * established by an an ancestor, this method allows callers to obtain this
+   * element's fill bounds in the userspace established by that ancestor
+   * instead. In that case, since we return the bounds in a different userspace
+   * (the ancestor's), the bounds we return are not this element's bbox, but
+   * rather this element's contribution to the bbox of the ancestor.
+   *
+   * @param aToBBoxUserspace The transform from the userspace established by
+   *   this element to the userspace established by the ancestor on which
+   *   getBBox was called. This will be the identity matrix if we are the
+   *   element on which getBBox was called.
+   *
+   * @param aFlags Flags indicating whether, stroke, for example, should be
+   *   included in the bbox calculation.
+   */
+  virtual SVGBBox GetBBoxContribution(const gfx::Matrix& aToBBoxUserspace,
+                                      uint32_t aFlags) = 0;
+
+  // Are we a container frame?
+  virtual bool IsDisplayContainer() = 0;
+};
+
+}  // namespace mozilla
+
+#endif  // LAYOUT_SVG_ISVGDISPLAYABLEFRAME_H_