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852 lines
36 KiB
C++
852 lines
36 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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/* utility functions for drawing borders and backgrounds */
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#ifndef nsCSSRendering_h___
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#define nsCSSRendering_h___
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#include "gfxBlur.h"
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#include "gfxContext.h"
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#include "nsLayoutUtils.h"
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#include "nsStyleStruct.h"
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#include "nsIFrame.h"
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class nsStyleContext;
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class nsPresContext;
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class nsRenderingContext;
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namespace mozilla {
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namespace layers {
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class ImageContainer;
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}
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// A CSSSizeOrRatio represents a (possibly partially specified) size for use
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// in computing image sizes. Either or both of the width and height might be
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// given. A ratio of width to height may also be given. If we at least two
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// of these then we can compute a concrete size, that is a width and height.
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struct CSSSizeOrRatio
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{
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CSSSizeOrRatio()
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: mRatio(0, 0)
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, mHasWidth(false)
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, mHasHeight(false) {}
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bool CanComputeConcreteSize() const
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{
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return mHasWidth + mHasHeight + HasRatio() >= 2;
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}
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bool IsConcrete() const { return mHasWidth && mHasHeight; }
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bool HasRatio() const { return mRatio.width > 0 && mRatio.height > 0; }
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bool IsEmpty() const
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{
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return (mHasWidth && mWidth <= 0) ||
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(mHasHeight && mHeight <= 0) ||
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mRatio.width <= 0 || mRatio.height <= 0;
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}
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// CanComputeConcreteSize must return true when ComputeConcreteSize is
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// called.
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nsSize ComputeConcreteSize() const;
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void SetWidth(nscoord aWidth)
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{
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mWidth = aWidth;
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mHasWidth = true;
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if (mHasHeight) {
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mRatio = nsSize(mWidth, mHeight);
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}
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}
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void SetHeight(nscoord aHeight)
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{
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mHeight = aHeight;
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mHasHeight = true;
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if (mHasWidth) {
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mRatio = nsSize(mWidth, mHeight);
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}
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}
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void SetSize(const nsSize& aSize)
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{
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mWidth = aSize.width;
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mHeight = aSize.height;
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mHasWidth = true;
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mHasHeight = true;
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mRatio = aSize;
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}
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void SetRatio(const nsSize& aRatio)
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{
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MOZ_ASSERT(!mHasWidth || !mHasHeight,
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"Probably shouldn't be setting a ratio if we have a concrete size");
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mRatio = aRatio;
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}
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nsSize mRatio;
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nscoord mWidth;
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nscoord mHeight;
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bool mHasWidth;
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bool mHasHeight;
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};
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}
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/**
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* This is a small wrapper class to encapsulate image drawing that can draw an
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* nsStyleImage image, which may internally be a real image, a sub image, or a
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* CSS gradient.
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*
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* @note Always call the member functions in the order of PrepareImage(),
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* SetSize(), and Draw*().
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*/
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class nsImageRenderer {
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public:
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typedef mozilla::layers::LayerManager LayerManager;
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typedef mozilla::layers::ImageContainer ImageContainer;
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enum {
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FLAG_SYNC_DECODE_IMAGES = 0x01,
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FLAG_PAINTING_TO_WINDOW = 0x02
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};
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enum FitType
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{
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CONTAIN,
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COVER
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};
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nsImageRenderer(nsIFrame* aForFrame, const nsStyleImage* aImage, uint32_t aFlags);
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~nsImageRenderer();
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/**
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* Populates member variables to get ready for rendering.
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* @return true iff the image is ready, and there is at least a pixel to
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* draw.
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*/
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bool PrepareImage();
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/**
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* The three Compute*Size functions correspond to the sizing algorthms and
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* definitions from the CSS Image Values and Replaced Content spec. See
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* http://dev.w3.org/csswg/css-images-3/#sizing .
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*/
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/**
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* Compute the intrinsic size of the image as defined in the CSS Image Values
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* spec. The intrinsic size is the unscaled size which the image would ideally
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* like to be in app units.
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*/
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mozilla::CSSSizeOrRatio ComputeIntrinsicSize();
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/**
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* Compute the size of the rendered image using either the 'cover' or
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* 'contain' constraints (aFitType).
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* aIntrinsicRatio may be an invalid ratio, that is one or both of its
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* dimensions can be less than or equal to zero.
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*/
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static nsSize ComputeConstrainedSize(const nsSize& aConstrainingSize,
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const nsSize& aIntrinsicRatio,
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FitType aFitType);
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/**
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* Compute the size of the rendered image (the concrete size) where no cover/
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* contain constraints are given. The 'default algorithm' from the CSS Image
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* Values spec.
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*/
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static nsSize ComputeConcreteSize(const mozilla::CSSSizeOrRatio& aSpecifiedSize,
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const mozilla::CSSSizeOrRatio& aIntrinsicSize,
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const nsSize& aDefaultSize);
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/**
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* Set this image's preferred size. This will be its intrinsic size where
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* specified and the default size where it is not. Used as the unscaled size
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* when rendering the image.
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*/
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void SetPreferredSize(const mozilla::CSSSizeOrRatio& aIntrinsicSize,
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const nsSize& aDefaultSize);
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/**
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* Draws the image to the target rendering context.
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* @see nsLayoutUtils::DrawImage() for other parameters.
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*/
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void Draw(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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const nsRect& aFill,
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const nsRect& aDest);
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/**
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* Draws the image to the target rendering context using background-specific
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* arguments.
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* @see nsLayoutUtils::DrawImage() for parameters.
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*/
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void DrawBackground(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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const nsRect& aDest,
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const nsRect& aFill,
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const nsPoint& aAnchor,
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const nsRect& aDirty);
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bool IsRasterImage();
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bool IsAnimatedImage();
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already_AddRefed<ImageContainer> GetContainer(LayerManager* aManager);
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bool IsReady() { return mIsReady; }
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private:
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nsIFrame* mForFrame;
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const nsStyleImage* mImage;
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nsStyleImageType mType;
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nsCOMPtr<imgIContainer> mImageContainer;
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nsRefPtr<nsStyleGradient> mGradientData;
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nsIFrame* mPaintServerFrame;
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nsLayoutUtils::SurfaceFromElementResult mImageElementSurface;
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bool mIsReady;
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nsSize mSize; // unscaled size of the image, in app units
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uint32_t mFlags;
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};
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/**
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* A struct representing all the information needed to paint a background
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* image to some target, taking into account all CSS background-* properties.
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* See PrepareBackgroundLayer.
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*/
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struct nsBackgroundLayerState {
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/**
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* @param aFlags some combination of nsCSSRendering::PAINTBG_* flags
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*/
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nsBackgroundLayerState(nsIFrame* aForFrame, const nsStyleImage* aImage, uint32_t aFlags)
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: mImageRenderer(aForFrame, aImage, aFlags), mCompositingOp(gfxContext::OPERATOR_OVER) {}
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/**
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* The nsImageRenderer that will be used to draw the background.
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*/
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nsImageRenderer mImageRenderer;
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/**
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* A rectangle that one copy of the image tile is mapped onto. Same
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* coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareBackgroundLayer.
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*/
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nsRect mDestArea;
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/**
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* The actual rectangle that should be filled with (complete or partial)
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* image tiles. Same coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareBackgroundLayer.
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*/
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nsRect mFillArea;
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/**
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* The anchor point that should be snapped to a pixel corner. Same
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* coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareBackgroundLayer.
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*/
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nsPoint mAnchor;
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/**
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* The compositing operation that the image should use
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*/
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gfxContext::GraphicsOperator mCompositingOp;
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};
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struct nsCSSRendering {
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/**
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* Initialize any static variables used by nsCSSRendering.
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*/
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static void Init();
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/**
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* Clean up any static variables used by nsCSSRendering.
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*/
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static void Shutdown();
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static void PaintBoxShadowInner(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aFrameArea,
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const nsRect& aDirtyRect);
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static void PaintBoxShadowOuter(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aFrameArea,
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const nsRect& aDirtyRect,
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float aOpacity = 1.0);
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static void ComputePixelRadii(const nscoord *aAppUnitsRadii,
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nscoord aAppUnitsPerPixel,
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gfxCornerSizes *oBorderRadii);
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/**
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* Render the border for an element using css rendering rules
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* for borders. aSkipSides is a bitmask of the sides to skip
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* when rendering. If 0 then no sides are skipped.
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*/
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static void PaintBorder(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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nsStyleContext* aStyleContext,
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int aSkipSides = 0);
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/**
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* Like PaintBorder, but taking an nsStyleBorder argument instead of
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* getting it from aStyleContext.
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*/
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static void PaintBorderWithStyleBorder(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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const nsStyleBorder& aBorderStyle,
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nsStyleContext* aStyleContext,
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int aSkipSides = 0);
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/**
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* Render the outline for an element using css rendering rules
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* for borders. aSkipSides is a bitmask of the sides to skip
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* when rendering. If 0 then no sides are skipped.
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*/
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static void PaintOutline(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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nsStyleContext* aStyleContext);
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/**
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* Render keyboard focus on an element.
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* |aFocusRect| is the outer rectangle of the focused element.
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* Uses a fixed style equivalent to "1px dotted |aColor|".
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* Not used for controls, because the native theme may differ.
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*/
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static void PaintFocus(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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const nsRect& aFocusRect,
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nscolor aColor);
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/**
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* Render a gradient for an element.
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*/
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static void PaintGradient(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsStyleGradient* aGradient,
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const nsRect& aDirtyRect,
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const nsRect& aOneCellArea,
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const nsRect& aFillArea);
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/**
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* Find the frame whose background style should be used to draw the
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* canvas background. aForFrame must be the frame for the root element
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* whose background style should be used. This function will return
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* aForFrame unless the <body> background should be propagated, in
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* which case we return the frame associated with the <body>'s background.
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*/
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static nsIFrame* FindBackgroundStyleFrame(nsIFrame* aForFrame);
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/**
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* @return true if |aFrame| is a canvas frame, in the CSS sense.
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*/
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static bool IsCanvasFrame(nsIFrame* aFrame);
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/**
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* Fill in an aBackgroundSC to be used to paint the background
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* for an element. This applies the rules for propagating
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* backgrounds between BODY, the root element, and the canvas.
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* @return true if there is some meaningful background.
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*/
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static bool FindBackground(nsIFrame* aForFrame,
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nsStyleContext** aBackgroundSC);
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/**
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* As FindBackground, but the passed-in frame is known to be a root frame
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* (returned from nsCSSFrameConstructor::GetRootElementStyleFrame())
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* and there is always some meaningful background returned.
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*/
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static nsStyleContext* FindRootFrameBackground(nsIFrame* aForFrame);
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/**
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* Returns background style information for the canvas.
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*
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* @param aForFrame
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* the frame used to represent the canvas, in the CSS sense (i.e.
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* nsCSSRendering::IsCanvasFrame(aForFrame) must be true)
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* @param aRootElementFrame
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* the frame representing the root element of the document
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* @param aBackground
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* contains background style information for the canvas on return
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*/
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static nsStyleContext*
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FindCanvasBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame)
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{
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NS_ABORT_IF_FALSE(IsCanvasFrame(aForFrame), "not a canvas frame");
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if (aRootElementFrame)
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return FindRootFrameBackground(aRootElementFrame);
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// This should always give transparent, so we'll fill it in with the
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// default color if needed. This seems to happen a bit while a page is
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// being loaded.
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return aForFrame->StyleContext();
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}
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/**
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* Find a frame which draws a non-transparent background,
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* for various table-related and HR-related backwards-compatibility hacks.
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* This function will also stop if it finds themed frame which might draw
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* background.
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*
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* Be very hesitant if you're considering calling this function -- it's
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* usually not what you want.
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*/
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static nsIFrame*
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FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
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bool aStartAtParent = false);
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/**
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* Determine the background color to draw taking into account print settings.
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*/
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static nscolor
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DetermineBackgroundColor(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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nsIFrame* aFrame,
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bool& aDrawBackgroundImage,
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bool& aDrawBackgroundColor);
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static nsRect
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ComputeBackgroundPositioningArea(nsPresContext* aPresContext,
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nsIFrame* aForFrame,
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const nsRect& aBorderArea,
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const nsStyleBackground& aBackground,
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const nsStyleBackground::Layer& aLayer,
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nsIFrame** aAttachedToFrame);
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static nsBackgroundLayerState
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PrepareBackgroundLayer(nsPresContext* aPresContext,
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nsIFrame* aForFrame,
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uint32_t aFlags,
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const nsRect& aBorderArea,
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const nsRect& aBGClipRect,
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const nsStyleBackground& aBackground,
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const nsStyleBackground::Layer& aLayer);
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/**
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* Render the background for an element using css rendering rules
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* for backgrounds.
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*/
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enum {
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/**
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* When this flag is passed, the element's nsDisplayBorder will be
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* painted immediately on top of this background.
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*/
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PAINTBG_WILL_PAINT_BORDER = 0x01,
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/**
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* When this flag is passed, images are synchronously decoded.
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*/
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PAINTBG_SYNC_DECODE_IMAGES = 0x02,
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/**
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* When this flag is passed, painting will go to the screen so we can
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* take advantage of the fact that it will be clipped to the viewport.
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*/
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PAINTBG_TO_WINDOW = 0x04
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};
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static void PaintBackground(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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uint32_t aFlags,
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nsRect* aBGClipRect = nullptr,
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int32_t aLayer = -1);
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static void PaintBackgroundColor(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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uint32_t aFlags);
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/**
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* Same as |PaintBackground|, except using the provided style structs.
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* This short-circuits the code that ensures that the root element's
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* background is drawn on the canvas.
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* The aLayer parameter allows you to paint a single layer of the background.
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* The default value for aLayer, -1, means that all layers will be painted.
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* The background color will only be painted if the back-most layer is also
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* being painted.
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*/
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static void PaintBackgroundWithSC(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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nsStyleContext *aStyleContext,
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const nsStyleBorder& aBorder,
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uint32_t aFlags,
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nsRect* aBGClipRect = nullptr,
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int32_t aLayer = -1);
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static void PaintBackgroundColorWithSC(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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nsStyleContext *aStyleContext,
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const nsStyleBorder& aBorder,
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uint32_t aFlags);
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/**
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* Returns the rectangle covered by the given background layer image, taking
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* into account background positioning, sizing, and repetition, but not
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* clipping.
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*/
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static nsRect GetBackgroundLayerRect(nsPresContext* aPresContext,
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nsIFrame* aForFrame,
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const nsRect& aBorderArea,
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const nsRect& aClipRect,
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const nsStyleBackground& aBackground,
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const nsStyleBackground::Layer& aLayer,
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uint32_t aFlags);
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/**
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* Checks if image in layer aLayer of aBackground is currently decoded.
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*/
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static bool IsBackgroundImageDecodedForStyleContextAndLayer(
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const nsStyleBackground *aBackground, uint32_t aLayer);
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/**
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* Checks if all images that are part of the background for aFrame are
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* currently decoded.
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*/
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static bool AreAllBackgroundImagesDecodedForFrame(nsIFrame* aFrame);
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/**
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* Called when we start creating a display list. The frame tree will not
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* change until a matching EndFrameTreeLocked is called.
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*/
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static void BeginFrameTreesLocked();
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/**
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* Called when we've finished using a display list. When all
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* BeginFrameTreeLocked calls have been balanced by an EndFrameTreeLocked,
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* the frame tree may start changing again.
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*/
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static void EndFrameTreesLocked();
|
|
|
|
// Draw a border segment in the table collapsing border model without
|
|
// beveling corners
|
|
static void DrawTableBorderSegment(nsRenderingContext& aContext,
|
|
uint8_t aBorderStyle,
|
|
nscolor aBorderColor,
|
|
const nsStyleBackground* aBGColor,
|
|
const nsRect& aBorderRect,
|
|
int32_t aAppUnitsPerCSSPixel,
|
|
uint8_t aStartBevelSide = 0,
|
|
nscoord aStartBevelOffset = 0,
|
|
uint8_t aEndBevelSide = 0,
|
|
nscoord aEndBevelOffset = 0);
|
|
|
|
/**
|
|
* Function for painting the decoration lines for the text.
|
|
* NOTE: aPt, aLineSize, aAscent and aOffset are non-rounded device pixels,
|
|
* not app units.
|
|
* input:
|
|
* @param aFrame the frame which needs the decoration line
|
|
* @param aGfxContext
|
|
* @param aDirtyRect no need to paint outside this rect
|
|
* @param aColor the color of the decoration line
|
|
* @param aPt the top/left edge of the text
|
|
* @param aXInFrame the distance between aPt.x and left edge of
|
|
* aFrame. If the decoration line is for shadow,
|
|
* set the distance between the left edge of
|
|
* the aFrame and the position of the text as
|
|
* positioned without offset of the shadow.
|
|
* @param aLineSize the width and the height of the decoration
|
|
* line
|
|
* @param aAscent the ascent of the text
|
|
* @param aOffset the offset of the decoration line from
|
|
* the baseline of the text (if the value is
|
|
* positive, the line is lifted up)
|
|
* @param aDecoration which line will be painted. The value can be
|
|
* NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_OVERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH.
|
|
* @param aStyle the style of the decoration line such as
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_*.
|
|
* @param aDescentLimit If aDescentLimit is zero or larger and the
|
|
* underline overflows from the descent space,
|
|
* the underline should be lifted up as far as
|
|
* possible. Note that this does not mean the
|
|
* underline never overflows from this
|
|
* limitation. Because if the underline is
|
|
* positioned to the baseline or upper, it causes
|
|
* unreadability. Note that if this is zero
|
|
* or larger, the underline rect may be shrunken
|
|
* if it's possible. Therefore, this value is
|
|
* used for strikeout line and overline too.
|
|
*/
|
|
static void PaintDecorationLine(nsIFrame* aFrame,
|
|
gfxContext* aGfxContext,
|
|
const gfxRect& aDirtyRect,
|
|
const nscolor aColor,
|
|
const gfxPoint& aPt,
|
|
const gfxFloat aXInFrame,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const uint8_t aDecoration,
|
|
const uint8_t aStyle,
|
|
const gfxFloat aDescentLimit = -1.0);
|
|
|
|
/**
|
|
* Adds a path corresponding to the outline of the decoration line to
|
|
* the specified context. Arguments have the same meaning as for
|
|
* PaintDecorationLine. Currently this only works for solid
|
|
* decorations; for other decoration styles, an empty path is added
|
|
* to the context.
|
|
*/
|
|
static void DecorationLineToPath(nsIFrame* aFrame,
|
|
gfxContext* aGfxContext,
|
|
const gfxRect& aDirtyRect,
|
|
const nscolor aColor,
|
|
const gfxPoint& aPt,
|
|
const gfxFloat aXInFrame,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const uint8_t aDecoration,
|
|
const uint8_t aStyle,
|
|
const gfxFloat aDescentLimit = -1.0);
|
|
|
|
/**
|
|
* Function for getting the decoration line rect for the text.
|
|
* NOTE: aLineSize, aAscent and aOffset are non-rounded device pixels,
|
|
* not app units.
|
|
* input:
|
|
* @param aPresContext
|
|
* @param aLineSize the width and the height of the decoration
|
|
* line
|
|
* @param aAscent the ascent of the text
|
|
* @param aOffset the offset of the decoration line from
|
|
* the baseline of the text (if the value is
|
|
* positive, the line is lifted up)
|
|
* @param aDecoration which line will be painted. The value can be
|
|
* NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_OVERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH.
|
|
* @param aStyle the style of the decoration line such as
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_*.
|
|
* @param aDescentLimit If aDescentLimit is zero or larger and the
|
|
* underline overflows from the descent space,
|
|
* the underline should be lifted up as far as
|
|
* possible. Note that this does not mean the
|
|
* underline never overflows from this
|
|
* limitation. Because if the underline is
|
|
* positioned to the baseline or upper, it causes
|
|
* unreadability. Note that if this is zero
|
|
* or larger, the underline rect may be shrunken
|
|
* if it's possible. Therefore, this value is
|
|
* used for strikeout line and overline too.
|
|
* output:
|
|
* @return the decoration line rect for the input,
|
|
* the each values are app units.
|
|
*/
|
|
static nsRect GetTextDecorationRect(nsPresContext* aPresContext,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const uint8_t aDecoration,
|
|
const uint8_t aStyle,
|
|
const gfxFloat aDescentLimit = -1.0);
|
|
|
|
static gfxContext::GraphicsOperator GetGFXBlendMode(uint8_t mBlendMode) {
|
|
switch (mBlendMode) {
|
|
case NS_STYLE_BLEND_NORMAL: return gfxContext::OPERATOR_OVER;
|
|
case NS_STYLE_BLEND_MULTIPLY: return gfxContext::OPERATOR_MULTIPLY;
|
|
case NS_STYLE_BLEND_SCREEN: return gfxContext::OPERATOR_SCREEN;
|
|
case NS_STYLE_BLEND_OVERLAY: return gfxContext::OPERATOR_OVERLAY;
|
|
case NS_STYLE_BLEND_DARKEN: return gfxContext::OPERATOR_DARKEN;
|
|
case NS_STYLE_BLEND_LIGHTEN: return gfxContext::OPERATOR_LIGHTEN;
|
|
case NS_STYLE_BLEND_COLOR_DODGE: return gfxContext::OPERATOR_COLOR_DODGE;
|
|
case NS_STYLE_BLEND_COLOR_BURN: return gfxContext::OPERATOR_COLOR_BURN;
|
|
case NS_STYLE_BLEND_HARD_LIGHT: return gfxContext::OPERATOR_HARD_LIGHT;
|
|
case NS_STYLE_BLEND_SOFT_LIGHT: return gfxContext::OPERATOR_SOFT_LIGHT;
|
|
case NS_STYLE_BLEND_DIFFERENCE: return gfxContext::OPERATOR_DIFFERENCE;
|
|
case NS_STYLE_BLEND_EXCLUSION: return gfxContext::OPERATOR_EXCLUSION;
|
|
case NS_STYLE_BLEND_HUE: return gfxContext::OPERATOR_HUE;
|
|
case NS_STYLE_BLEND_SATURATION: return gfxContext::OPERATOR_SATURATION;
|
|
case NS_STYLE_BLEND_COLOR: return gfxContext::OPERATOR_COLOR;
|
|
case NS_STYLE_BLEND_LUMINOSITY: return gfxContext::OPERATOR_LUMINOSITY;
|
|
default: MOZ_ASSERT(false); return gfxContext::OPERATOR_OVER;
|
|
}
|
|
|
|
return gfxContext::OPERATOR_OVER;
|
|
}
|
|
|
|
protected:
|
|
static gfxRect GetTextDecorationRectInternal(const gfxPoint& aPt,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const uint8_t aDecoration,
|
|
const uint8_t aStyle,
|
|
const gfxFloat aDscentLimit);
|
|
|
|
/**
|
|
* Returns inflated rect for painting a decoration line.
|
|
* Complex style decoration lines should be painted from leftmost of nearest
|
|
* ancestor block box because that makes better look of connection of lines
|
|
* for different nodes. ExpandPaintingRectForDecorationLine() returns
|
|
* a rect for actual painting rect for the clipped rect.
|
|
*
|
|
* input:
|
|
* @param aFrame the frame which needs the decoration line.
|
|
* @param aStyle the style of the complex decoration line
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_DOTTED or
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_DASHED or
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_WAVY.
|
|
* @param aClippedRect the clipped rect for the decoration line.
|
|
* in other words, visible area of the line.
|
|
* @param aXInFrame the distance between left edge of aFrame and
|
|
* aClippedRect.pos.x.
|
|
* @param aCycleLength the width of one cycle of the line style.
|
|
*/
|
|
static gfxRect ExpandPaintingRectForDecorationLine(
|
|
nsIFrame* aFrame,
|
|
const uint8_t aStyle,
|
|
const gfxRect &aClippedRect,
|
|
const gfxFloat aXInFrame,
|
|
const gfxFloat aCycleLength);
|
|
};
|
|
|
|
/*
|
|
* nsContextBoxBlur
|
|
* Creates an 8-bit alpha channel context for callers to draw in, blurs the
|
|
* contents of that context and applies it as a 1-color mask on a
|
|
* different existing context. Uses gfxAlphaBoxBlur as its back end.
|
|
*
|
|
* You must call Init() first to create a suitable temporary surface to draw
|
|
* on. You must then draw any desired content onto the given context, then
|
|
* call DoPaint() to apply the blurred content as a single-color mask. You
|
|
* can only call Init() once, so objects cannot be reused.
|
|
*
|
|
* This is very useful for creating drop shadows or silhouettes.
|
|
*/
|
|
class nsContextBoxBlur {
|
|
public:
|
|
enum {
|
|
FORCE_MASK = 0x01
|
|
};
|
|
/**
|
|
* Prepares a gfxContext to draw on. Do not call this twice; if you want
|
|
* to get the gfxContext again use GetContext().
|
|
*
|
|
* @param aRect The coordinates of the surface to create.
|
|
* All coordinates must be in app units.
|
|
* This must not include the blur radius, pass
|
|
* it as the second parameter and everything
|
|
* is taken care of.
|
|
*
|
|
* @param aBlurRadius The blur radius in app units.
|
|
*
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
*
|
|
* @param aDestinationCtx The graphics context to apply the blurred
|
|
* mask to when you call DoPaint(). Make sure
|
|
* it is not destroyed before you call
|
|
* DoPaint(). To set the color of the
|
|
* resulting blurred graphic mask, you must
|
|
* set the color on this context before
|
|
* calling Init().
|
|
*
|
|
* @param aDirtyRect The absolute dirty rect in app units. Used to
|
|
* optimize the temporary surface size and speed up blur.
|
|
*
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to avoid
|
|
* blurring over, to prevent unnecessary work.
|
|
*
|
|
* @param aFlags FORCE_MASK to ensure that the content drawn to the
|
|
* returned gfxContext is used as a mask, and not
|
|
* drawn directly to aDestinationCtx.
|
|
*
|
|
* @return A blank 8-bit alpha-channel-only graphics context to
|
|
* draw on, or null on error. Must not be freed. The
|
|
* context has a device offset applied to it given by
|
|
* aRect. This means you can use coordinates as if it
|
|
* were at the desired position at aRect and you don't
|
|
* need to worry about translating any coordinates to
|
|
* draw on this temporary surface.
|
|
*
|
|
* If aBlurRadius is 0, the returned context is aDestinationCtx and
|
|
* DoPaint() does nothing, because no blurring is required. Therefore, you
|
|
* should prepare the destination context as if you were going to draw
|
|
* directly on it instead of any temporary surface created in this class.
|
|
*/
|
|
gfxContext* Init(const nsRect& aRect, nscoord aSpreadRadius,
|
|
nscoord aBlurRadius,
|
|
int32_t aAppUnitsPerDevPixel, gfxContext* aDestinationCtx,
|
|
const nsRect& aDirtyRect, const gfxRect* aSkipRect,
|
|
uint32_t aFlags = 0);
|
|
|
|
/**
|
|
* Does the actual blurring and mask applying. Users of this object *must*
|
|
* have called Init() first, then have drawn whatever they want to be
|
|
* blurred onto the internal gfxContext before calling this.
|
|
*/
|
|
void DoPaint();
|
|
|
|
/**
|
|
* Gets the internal gfxContext at any time. Must not be freed. Avoid
|
|
* calling this before calling Init() since the context would not be
|
|
* constructed at that point.
|
|
*/
|
|
gfxContext* GetContext();
|
|
|
|
|
|
/**
|
|
* Get the margin associated with the given blur radius, i.e., the
|
|
* additional area that might be painted as a result of it. (The
|
|
* margin for a spread radius is itself, on all sides.)
|
|
*/
|
|
static nsMargin GetBlurRadiusMargin(nscoord aBlurRadius,
|
|
int32_t aAppUnitsPerDevPixel);
|
|
|
|
/**
|
|
* Blurs a coloured rectangle onto aDestinationCtx. This is equivalent
|
|
* to calling Init(), drawing a rectangle onto the returned surface
|
|
* and then calling DoPaint, but may let us optimize better in the
|
|
* backend.
|
|
*
|
|
* @param aDestinationCtx The destination to blur to.
|
|
* @param aRect The rectangle to blur in app units.
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
* @param aCornerRadii Corner radii for aRect, if it is a rounded
|
|
* rectangle.
|
|
* @param aBlurRadius The blur radius in app units.
|
|
* @param aShadowColor The color to draw the blurred shadow.
|
|
* @param aDirtyRect The absolute dirty rect in app units. Used to
|
|
* optimize the temporary surface size and speed up blur.
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to avoid
|
|
* blurring over, to prevent unnecessary work.
|
|
*/
|
|
static void BlurRectangle(gfxContext* aDestinationCtx,
|
|
const nsRect& aRect,
|
|
int32_t aAppUnitsPerDevPixel,
|
|
gfxCornerSizes* aCornerRadii,
|
|
nscoord aBlurRadius,
|
|
const gfxRGBA& aShadowColor,
|
|
const nsRect& aDirtyRect,
|
|
const gfxRect& aSkipRect);
|
|
|
|
protected:
|
|
gfxAlphaBoxBlur blur;
|
|
nsRefPtr<gfxContext> mContext;
|
|
gfxContext* mDestinationCtx;
|
|
|
|
/* This is true if the blur already has it's content transformed
|
|
* by mDestinationCtx's transform */
|
|
bool mPreTransformed;
|
|
|
|
};
|
|
|
|
#endif /* nsCSSRendering_h___ */
|