mirror of
https://github.com/classilla/tenfourfox.git
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171 lines
6.1 KiB
C++
171 lines
6.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A class representing three matrices that can be used for style transforms.
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*/
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#ifndef nsStyleTransformMatrix_h_
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#define nsStyleTransformMatrix_h_
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#include "nsCSSValue.h"
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class nsIFrame;
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class nsStyleContext;
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class nsPresContext;
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struct nsRect;
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namespace mozilla {
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class RuleNodeCacheConditions;
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} // namespace mozilla
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/**
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* A helper to generate gfxMatrixes from css transform functions.
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*/
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namespace nsStyleTransformMatrix {
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/**
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* This class provides on-demand access to the 'reference box' for CSS
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* transforms (needed to resolve percentage values in 'transform',
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* 'transform-origin', etc.):
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*
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* http://dev.w3.org/csswg/css-transforms/#reference-box
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*
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* This class helps us to avoid calculating the reference box unless and
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* until it is actually needed. This is important for performance when
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* transforms are applied to SVG elements since the reference box for SVG is
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* much more expensive to calculate (than for elements with a CSS layout box
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* where we can use the nsIFrame's cached mRect), much more common (than on
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* HTML), and yet very rarely have percentage values that require the
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* reference box to be resolved. We also don't want to cause SVG frames to
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* cache lots of ObjectBoundingBoxProperty objects that aren't needed.
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*
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* If UNIFIED_CONTINUATIONS (experimental, and currently broke) is defined,
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* we consider the reference box for non-SVG frames to be the smallest
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* rectangle containing a frame and all of its continuations. For example,
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* if there is a <span> element with several continuations split over
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* several lines, this function will return the rectangle containing all of
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* those continuations. (This behavior is not currently in a spec.)
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*/
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class MOZ_STACK_CLASS TransformReferenceBox final {
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public:
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typedef nscoord (TransformReferenceBox::*DimensionGetter)();
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explicit TransformReferenceBox()
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: mFrame(nullptr)
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, mIsCached(false)
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{}
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explicit TransformReferenceBox(const nsIFrame* aFrame)
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: mFrame(aFrame)
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, mIsCached(false)
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{
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MOZ_ASSERT(mFrame);
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}
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explicit TransformReferenceBox(const nsIFrame* aFrame,
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const nsSize& aFallbackDimensions)
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{
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mFrame = aFrame;
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mIsCached = false;
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if (!mFrame) {
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Init(aFallbackDimensions);
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}
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}
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void Init(const nsIFrame* aFrame) {
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MOZ_ASSERT(!mFrame && !mIsCached);
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mFrame = aFrame;
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}
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void Init(const nsSize& aDimensions);
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/**
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* The offset of the reference box from the nsIFrame's TopLeft(). This
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* is non-zero only in the case of SVG content. If we can successfully
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* implement UNIFIED_CONTINUATIONS at some point in the future then it
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* may also be non-zero for non-SVG content.
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*/
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nscoord X() {
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EnsureDimensionsAreCached();
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return mX;
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}
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nscoord Y() {
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EnsureDimensionsAreCached();
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return mY;
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}
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/**
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* The size of the reference box.
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*/
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nscoord Width() {
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EnsureDimensionsAreCached();
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return mWidth;
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}
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nscoord Height() {
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EnsureDimensionsAreCached();
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return mHeight;
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}
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private:
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// We don't really need to prevent copying, but since none of our consumers
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// currently need to copy, preventing copying may allow us to catch some
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// cases where we use pass-by-value instead of pass-by-reference.
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TransformReferenceBox(const TransformReferenceBox&) = delete;
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void EnsureDimensionsAreCached();
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const nsIFrame* mFrame;
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nscoord mX, mY, mWidth, mHeight;
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bool mIsCached;
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};
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/**
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* Return the transform function, as an nsCSSKeyword, for the given
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* nsCSSValue::Array from a transform list.
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*/
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nsCSSKeyword TransformFunctionOf(const nsCSSValue::Array* aData);
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float ProcessTranslatePart(const nsCSSValue& aValue,
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nsStyleContext* aContext,
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nsPresContext* aPresContext,
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mozilla::RuleNodeCacheConditions& aConditions,
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TransformReferenceBox* aRefBox,
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TransformReferenceBox::DimensionGetter aDimensionGetter = nullptr);
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void
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ProcessInterpolateMatrix(mozilla::gfx::Matrix4x4& aMatrix,
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const nsCSSValue::Array* aData,
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nsStyleContext* aContext,
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nsPresContext* aPresContext,
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mozilla::RuleNodeCacheConditions& aConditions,
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TransformReferenceBox& aBounds);
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/**
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* Given an nsCSSValueList containing -moz-transform functions,
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* returns a matrix containing the value of those functions.
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*
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* @param aData The nsCSSValueList containing the transform functions
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* @param aContext The style context, used for unit conversion.
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* @param aPresContext The presentation context, used for unit conversion.
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* @param aConditions Set to uncachable (by calling SetUncacheable()) if the
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* result cannot be cached in the rule tree, otherwise untouched.
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* @param aBounds The frame's bounding rectangle.
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* @param aAppUnitsPerMatrixUnit The number of app units per device pixel.
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*
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* aContext and aPresContext may be null if all of the (non-percent)
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* length values in aData are already known to have been converted to
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* eCSSUnit_Pixel (as they are in an StyleAnimationValue)
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*/
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mozilla::gfx::Matrix4x4 ReadTransforms(const nsCSSValueList* aList,
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nsStyleContext* aContext,
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nsPresContext* aPresContext,
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mozilla::RuleNodeCacheConditions& aConditions,
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TransformReferenceBox& aBounds,
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float aAppUnitsPerMatrixUnit);
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} // namespace nsStyleTransformMatrix
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#endif
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