зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
4.0 KiB
C++
139 строки
4.0 KiB
C++
/* -*- 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 MOZILLA_PAINTING_TRANSFORMCLIPNODE_H
|
|
#define MOZILLA_PAINTING_TRANSFORMCLIPNODE_H
|
|
|
|
#include "mozilla/gfx/MatrixFwd.h"
|
|
#include "mozilla/gfx/Rect.h"
|
|
#include "mozilla/Maybe.h"
|
|
#include "nsISupports.h"
|
|
#include "nsRegionFwd.h"
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* TransformClipNode stores a transformation matrix and a post-transform
|
|
* clip rect.
|
|
* They can be used to transform and clip a display item inside a flattened
|
|
* nsDisplayTransform to the coordinate space of that nsDisplayTransform.
|
|
*/
|
|
class TransformClipNode {
|
|
NS_INLINE_DECL_REFCOUNTING(TransformClipNode);
|
|
|
|
public:
|
|
TransformClipNode(const RefPtr<TransformClipNode>& aParent,
|
|
const gfx::Matrix4x4Flagged& aTransform,
|
|
const Maybe<gfx::IntRect>& aClip)
|
|
: mParent(aParent), mTransform(aTransform), mClip(aClip) {
|
|
MOZ_COUNT_CTOR(TransformClipNode);
|
|
}
|
|
|
|
/**
|
|
* Returns the parent node, or nullptr if this is the root node.
|
|
*/
|
|
const RefPtr<TransformClipNode>& Parent() const { return mParent; }
|
|
|
|
/**
|
|
* Transforms and clips |aRect| up to the root transform node.
|
|
* |aRect| is expected to be in app units.
|
|
*/
|
|
nsRect TransformRect(const nsRect& aRect, const int32_t aA2D) const {
|
|
if (aRect.IsEmpty()) {
|
|
return aRect;
|
|
}
|
|
|
|
gfx::Rect result(NSAppUnitsToFloatPixels(aRect.x, aA2D),
|
|
NSAppUnitsToFloatPixels(aRect.y, aA2D),
|
|
NSAppUnitsToFloatPixels(aRect.width, aA2D),
|
|
NSAppUnitsToFloatPixels(aRect.height, aA2D));
|
|
TransformRect(result);
|
|
return nsRect(NSFloatPixelsToAppUnits(result.x, aA2D),
|
|
NSFloatPixelsToAppUnits(result.y, aA2D),
|
|
NSFloatPixelsToAppUnits(result.width, aA2D),
|
|
NSFloatPixelsToAppUnits(result.height, aA2D));
|
|
}
|
|
|
|
/**
|
|
* Transforms and clips |aRect| up to the root transform node.
|
|
* |aRect| is expected to be in integer pixels.
|
|
*/
|
|
gfx::IntRect TransformRect(const gfx::IntRect& aRect) const {
|
|
if (aRect.IsEmpty()) {
|
|
return aRect;
|
|
}
|
|
|
|
gfx::Rect result(IntRectToRect(aRect));
|
|
TransformRect(result);
|
|
return RoundedToInt(result);
|
|
}
|
|
|
|
/**
|
|
* Transforms and clips |aRegion| up to the root transform node.
|
|
* |aRegion| is expected be in integer pixels.
|
|
*/
|
|
nsIntRegion TransformRegion(const nsIntRegion& aRegion) {
|
|
if (aRegion.IsEmpty()) {
|
|
return aRegion;
|
|
}
|
|
|
|
nsIntRegion result = aRegion;
|
|
|
|
const TransformClipNode* node = this;
|
|
while (node) {
|
|
const gfx::Matrix4x4Flagged& transform = node->Transform();
|
|
result = result.Transform(transform.GetMatrix());
|
|
|
|
if (node->Clip()) {
|
|
const gfx::IntRect clipRect = *node->Clip();
|
|
result.AndWith(clipRect);
|
|
}
|
|
|
|
node = node->Parent();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
protected:
|
|
/**
|
|
* Returns the post-transform clip, if there is one.
|
|
*/
|
|
const Maybe<gfx::IntRect>& Clip() const { return mClip; }
|
|
|
|
/**
|
|
* Returns the matrix that transforms the item bounds to the coordinate space
|
|
* of the flattened nsDisplayTransform.
|
|
*/
|
|
const gfx::Matrix4x4Flagged& Transform() const { return mTransform; }
|
|
|
|
void TransformRect(gfx::Rect& aRect) const {
|
|
const TransformClipNode* node = this;
|
|
while (node) {
|
|
const gfx::Matrix4x4Flagged& transform = node->Transform();
|
|
gfx::Rect maxBounds = gfx::Rect::MaxIntRect();
|
|
|
|
if (node->Clip()) {
|
|
maxBounds = IntRectToRect(*node->Clip());
|
|
}
|
|
|
|
aRect = transform.TransformAndClipBounds(aRect, maxBounds);
|
|
node = node->Parent();
|
|
}
|
|
}
|
|
|
|
private:
|
|
MOZ_COUNTED_DTOR(TransformClipNode)
|
|
|
|
const RefPtr<TransformClipNode> mParent;
|
|
const gfx::Matrix4x4Flagged mTransform;
|
|
const Maybe<gfx::IntRect> mClip;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* MOZILLA_PAINTING_TRANSFORMCLIPNODE_H */
|