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494 lines
22 KiB
C++
494 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsStyleConsts.h"
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#include "gfxBlur.h"
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#include "gfxContext.h"
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#include "gfxImageSurface.h"
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struct nsPoint;
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class nsStyleContext;
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class nsPresContext;
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class nsRenderingContext;
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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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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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PRIntn 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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PRIntn 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 PR_TRUE if |aFrame| is a canvas frame, in the CSS sense.
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*/
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static PRBool 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 PR_TRUE if there is some meaningful background.
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*/
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static PRBool FindBackground(nsPresContext* aPresContext,
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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->GetStyleContext();
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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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PRBool aStartAtParent = PR_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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PRBool& aDrawBackgroundImage,
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PRBool& aDrawBackgroundColor);
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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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PRUint32 aFlags,
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nsRect* aBGClipRect = nsnull);
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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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*/
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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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PRUint32 aFlags,
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nsRect* aBGClipRect = nsnull);
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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 nsStyleBackground& aBackground,
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const nsStyleBackground::Layer& aLayer);
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/**
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* Called by the presShell when painting is finished, so we can clear our
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* inline background data cache.
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*/
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static void DidPaint();
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// Draw a border segment in the table collapsing border model without
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// beveling corners
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static void DrawTableBorderSegment(nsRenderingContext& aContext,
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PRUint8 aBorderStyle,
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nscolor aBorderColor,
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const nsStyleBackground* aBGColor,
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const nsRect& aBorderRect,
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PRInt32 aAppUnitsPerCSSPixel,
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PRUint8 aStartBevelSide = 0,
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nscoord aStartBevelOffset = 0,
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PRUint8 aEndBevelSide = 0,
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nscoord aEndBevelOffset = 0);
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/**
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* Function for painting the decoration lines for the text.
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* NOTE: aPt, aLineSize, aAscent and aOffset are non-rounded device pixels,
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* not app units.
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* input:
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* @param aGfxContext
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* @param aColor the color of the decoration line
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* @param aPt the top/left edge of the text
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* @param aLineSize the width and the height of the decoration
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* line
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* @param aAscent the ascent of the text
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* @param aOffset the offset of the decoration line from
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* the baseline of the text (if the value is
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* positive, the line is lifted up)
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* @param aDecoration which line will be painted. The value can be
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* NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE or
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* NS_STYLE_TEXT_DECORATION_LINE_OVERLINE or
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* NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH.
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* @param aStyle the style of the decoration line such as
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* NS_STYLE_TEXT_DECORATION_STYLE_*.
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* @param aDescentLimit If aDescentLimit is zero or larger and the
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* underline overflows from the descent space,
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* the underline should be lifted up as far as
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* possible. Note that this does not mean the
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* underline never overflows from this
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* limitation. Because if the underline is
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* positioned to the baseline or upper, it causes
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* unreadability. Note that if this is zero
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* or larger, the underline rect may be shrunken
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* if it's possible. Therefore, this value is
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* used for strikeout line and overline too.
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*/
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static void PaintDecorationLine(gfxContext* aGfxContext,
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const nscolor aColor,
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const gfxPoint& aPt,
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const gfxSize& aLineSize,
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const gfxFloat aAscent,
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const gfxFloat aOffset,
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const PRUint8 aDecoration,
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const PRUint8 aStyle,
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const gfxFloat aDescentLimit = -1.0);
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/**
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* Function for getting the decoration line rect for the text.
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* NOTE: aLineSize, aAscent and aOffset are non-rounded device pixels,
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* not app units.
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* input:
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* @param aPresContext
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* @param aLineSize the width and the height of the decoration
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* line
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* @param aAscent the ascent of the text
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* @param aOffset the offset of the decoration line from
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* the baseline of the text (if the value is
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* positive, the line is lifted up)
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* @param aDecoration which line will be painted. The value can be
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* NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE or
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* NS_STYLE_TEXT_DECORATION_LINE_OVERLINE or
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* NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH.
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* @param aStyle the style of the decoration line such as
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* NS_STYLE_TEXT_DECORATION_STYLE_*.
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* @param aDescentLimit If aDescentLimit is zero or larger and the
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* underline overflows from the descent space,
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* the underline should be lifted up as far as
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* possible. Note that this does not mean the
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* underline never overflows from this
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* limitation. Because if the underline is
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* positioned to the baseline or upper, it causes
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* unreadability. Note that if this is zero
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* or larger, the underline rect may be shrunken
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* if it's possible. Therefore, this value is
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* used for strikeout line and overline too.
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* output:
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* @return the decoration line rect for the input,
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* the each values are app units.
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*/
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static nsRect GetTextDecorationRect(nsPresContext* aPresContext,
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const gfxSize& aLineSize,
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const gfxFloat aAscent,
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const gfxFloat aOffset,
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const PRUint8 aDecoration,
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const PRUint8 aStyle,
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const gfxFloat aDescentLimit = -1.0);
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protected:
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static gfxRect GetTextDecorationRectInternal(const gfxPoint& aPt,
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const gfxSize& aLineSize,
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const gfxFloat aAscent,
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const gfxFloat aOffset,
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const PRUint8 aDecoration,
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const PRUint8 aStyle,
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const gfxFloat aDscentLimit);
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};
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/*
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* nsContextBoxBlur
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* Creates an 8-bit alpha channel context for callers to draw in, blurs the
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* contents of that context and applies it as a 1-color mask on a
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* different existing context. Uses gfxAlphaBoxBlur as its back end.
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*
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* You must call Init() first to create a suitable temporary surface to draw
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* on. You must then draw any desired content onto the given context, then
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* call DoPaint() to apply the blurred content as a single-color mask. You
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* can only call Init() once, so objects cannot be reused.
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*
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* This is very useful for creating drop shadows or silhouettes.
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*/
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class nsContextBoxBlur {
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public:
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enum {
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FORCE_MASK = 0x01
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};
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/**
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* Prepares a gfxContext to draw on. Do not call this twice; if you want
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* to get the gfxContext again use GetContext().
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*
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* @param aRect The coordinates of the surface to create.
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* All coordinates must be in app units.
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* This must not include the blur radius, pass
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* it as the second parameter and everything
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* is taken care of.
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*
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* @param aBlurRadius The blur radius in app units.
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*
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* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
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* for conversion. Most of the time you'll
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* pass this from the current PresContext if
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* available.
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*
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* @param aDestinationCtx The graphics context to apply the blurred
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* mask to when you call DoPaint(). Make sure
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* it is not destroyed before you call
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* DoPaint(). To set the color of the
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* resulting blurred graphic mask, you must
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* set the color on this context before
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* calling Init().
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*
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* @param aDirtyRect The absolute dirty rect in app units. Used to
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* optimize the temporary surface size and speed up blur.
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*
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* @param aSkipRect An area in device pixels (NOT app units!) to avoid
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* blurring over, to prevent unnecessary work.
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*
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* @param aFlags FORCE_MASK to ensure that the content drawn to the
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* returned gfxContext is used as a mask, and not
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* drawn directly to aDestinationCtx.
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*
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* @return A blank 8-bit alpha-channel-only graphics context to
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* draw on, or null on error. Must not be freed. The
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* context has a device offset applied to it given by
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* aRect. This means you can use coordinates as if it
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* were at the desired position at aRect and you don't
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* need to worry about translating any coordinates to
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* draw on this temporary surface.
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*
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* If aBlurRadius is 0, the returned context is aDestinationCtx and
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* DoPaint() does nothing, because no blurring is required. Therefore, you
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* should prepare the destination context as if you were going to draw
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* directly on it instead of any temporary surface created in this class.
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*/
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gfxContext* Init(const nsRect& aRect, nscoord aSpreadRadius,
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nscoord aBlurRadius,
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PRInt32 aAppUnitsPerDevPixel, gfxContext* aDestinationCtx,
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const nsRect& aDirtyRect, const gfxRect* aSkipRect,
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PRUint32 aFlags = 0);
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/**
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* Does the actual blurring/spreading. Users of this object *must*
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* have called Init() first, then have drawn whatever they want to be
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* blurred onto the internal gfxContext before calling this.
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*/
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void DoEffects();
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/**
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* Does the actual blurring and mask applying. Users of this object *must*
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* have called Init() first, then have drawn whatever they want to be
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* blurred onto the internal gfxContext before calling this.
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*/
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void DoPaint();
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/**
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* Gets the internal gfxContext at any time. Must not be freed. Avoid
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* calling this before calling Init() since the context would not be
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* constructed at that point.
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*/
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gfxContext* GetContext();
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/**
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* Get the margin associated with the given blur radius, i.e., the
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* additional area that might be painted as a result of it. (The
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* margin for a spread radius is itself, on all sides.)
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*/
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static nsMargin GetBlurRadiusMargin(nscoord aBlurRadius,
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PRInt32 aAppUnitsPerDevPixel);
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protected:
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gfxAlphaBoxBlur blur;
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nsRefPtr<gfxContext> mContext;
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gfxContext* mDestinationCtx;
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};
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#endif /* nsCSSRendering_h___ */
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