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129 lines
4.6 KiB
C++
129 lines
4.6 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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#ifndef __NS_CSSFILTERINSTANCE_H__
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#define __NS_CSSFILTERINSTANCE_H__
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#include "FilterSupport.h"
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#include "gfxMatrix.h"
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#include "gfxRect.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/gfx/Types.h"
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#include "nsColor.h"
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class nsIFrame;
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struct nsStyleFilter;
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template<class T> class nsTArray;
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/**
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* This class helps nsFilterInstance build its filter graph. It turns a CSS
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* filter function (e.g. blur(3px)) from the style system into a
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* FilterPrimitiveDescription connected to the filter graph.
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*/
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class nsCSSFilterInstance
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{
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typedef mozilla::gfx::Color Color;
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typedef mozilla::gfx::FilterPrimitiveDescription FilterPrimitiveDescription;
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typedef mozilla::gfx::IntPoint IntPoint;
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typedef mozilla::gfx::PrimitiveType PrimitiveType;
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typedef mozilla::gfx::Size Size;
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public:
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/**
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* @param aFilter The CSS filter from the style system. This class stores
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* aFilter by reference, so callers should avoid modifying or deleting
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* aFilter during the lifetime of nsCSSFilterInstance.
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* @param mTargetBBoxInFilterSpace The frame of element being filtered, in
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* filter space.
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* @param aFrameSpaceInCSSPxToFilterSpaceTransform The transformation from
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* the filtered element's frame space in CSS pixels to filter space.
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*/
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nsCSSFilterInstance(const nsStyleFilter& aFilter,
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nsIFrame *aTargetFrame,
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const nsIntRect& mTargetBBoxInFilterSpace,
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const gfxMatrix& aFrameSpaceInCSSPxToFilterSpaceTransform);
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/**
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* Creates at least one new FilterPrimitiveDescription based on the filter
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* from the style system. Appends the new FilterPrimitiveDescription(s) to the
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* aPrimitiveDescrs list.
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*/
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nsresult BuildPrimitives(nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs);
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private:
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/**
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* Returns a new FilterPrimitiveDescription with its basic properties set up.
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*/
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FilterPrimitiveDescription CreatePrimitiveDescription(PrimitiveType aType,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs);
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/**
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* Sets aDescr's attributes using the style info in mFilter.
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*/
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nsresult SetAttributesForBlur(FilterPrimitiveDescription& aDescr);
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nsresult SetAttributesForDropShadow(FilterPrimitiveDescription& aDescr);
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nsresult SetAttributesForGrayscale(FilterPrimitiveDescription& aDescr);
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nsresult SetAttributesForHueRotate(FilterPrimitiveDescription& aDescr);
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nsresult SetAttributesForSaturate(FilterPrimitiveDescription& aDescr);
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nsresult SetAttributesForSepia(FilterPrimitiveDescription& aDescr);
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/**
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* Returns the index of the last result in the aPrimitiveDescrs, which we'll
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* use as the input to this CSS filter.
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*/
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int32_t GetLastResultIndex(const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs);
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/**
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* Sets aDescr's filter region and primitive subregion to appropriate values
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* based on this CSS filter's input and its attributes. For example, a CSS
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* blur filter will have bounds equal to its input bounds, inflated by the
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* blur extents.
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*/
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void SetBounds(FilterPrimitiveDescription& aDescr,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs);
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/**
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* Converts an nscolor to a Color, suitable for use as a
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* FilterPrimitiveDescription attribute.
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*/
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Color ToAttributeColor(nscolor aColor);
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/**
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* Converts a blur radius in frame space to filter space.
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*/
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Size BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace);
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/**
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* Converts a point defined by a pair of nscoord x, y coordinates from frame
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* space to filter space.
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*/
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IntPoint OffsetToFilterSpace(nscoord aXOffsetInFrameSpace,
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nscoord aYOffsetInFrameSpace);
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/**
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* The CSS filter originally from the style system.
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*/
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const nsStyleFilter& mFilter;
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/**
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* The frame for the element that is currently being filtered.
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*/
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nsIFrame* mTargetFrame;
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/**
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* The bounding box of the element being filtered, in filter space. Used for
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* input bounds if this CSS filter is the first in the filter chain.
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*/
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nsIntRect mTargetBBoxInFilterSpace;
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/**
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* The transformation from the filtered element's frame space in CSS pixels to
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* filter space. Used to transform style values to filter space.
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*/
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gfxMatrix mFrameSpaceInCSSPxToFilterSpaceTransform;
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};
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#endif
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