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277 lines
11 KiB
C++
277 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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* IBM Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* IBM Corporation
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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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#ifdef IBMBIDI
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#ifndef nsBidiPresUtils_h___
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#define nsBidiPresUtils_h___
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#include "nsVoidArray.h"
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#include "nsIFrame.h"
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#include "nsBidi.h"
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#include "nsBidiUtils.h"
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#include "nsCOMPtr.h"
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#include "nsDataHashtable.h"
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/**
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* A structure representing a logical position which should be resolved
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* into its visual position during BiDi processing.
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*/
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struct nsBidiPositionResolve
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{
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// [in] Logical index within string.
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PRInt32 logicalIndex;
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// [out] Visual index within string.
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// If the logical position was not found, set to kNotFound.
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PRInt32 visualIndex;
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// [out] Visual position of the character, from the left (on the X axis), in twips.
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// Eessentially, this is the X position (relative to the rendering context) where the text was drawn + the font metric of the visual string to the left of the given logical position.
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// If the logical position was not found, set to kNotFound.
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PRInt32 visualLeftTwips;
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};
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class nsBidiPresUtils {
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public:
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nsBidiPresUtils();
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~nsBidiPresUtils();
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PRBool IsSuccessful(void) const;
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/**
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* Make Bidi engine calculate the embedding levels of the frames that are
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* descendants of a given block frame.
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*
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* @param aPresContext The presContext
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* @param aBlockFrame The block frame
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* @param aFirstChild The first child frame of aBlockFrame
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* @param aForceReflow [OUT] Set if we delete frames and will need to
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* reflow the block frame
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* @param aIsVisualFormControl [IN] Set if we are in a form control on a
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* visual page.
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* @see nsHTMLReflowState::IsBidiFormControl
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*
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* @lina 06/18/2000
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*/
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nsresult Resolve(nsPresContext* aPresContext,
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nsIFrame* aBlockFrame,
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nsIFrame* aFirstChild,
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PRBool& aForceReflow,
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PRBool aIsVisualFormControl);
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/**
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* Reorder this line using Bidi engine.
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* Update frame array, following the new visual sequence.
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*
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* @lina 05/02/2000
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*/
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void ReorderFrames(nsPresContext* aPresContext,
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nsIRenderingContext* aRendContext,
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nsIFrame* aFirstChild,
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nsIFrame* aNextInFlow,
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PRInt32 aChildCount);
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/**
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* Format Unicode text, taking into account bidi capabilities
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* of the platform. The formatting includes: reordering, Arabic shaping,
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* symmetric and numeric swapping, removing control characters.
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*
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* @lina 06/18/2000
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*/
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nsresult FormatUnicodeText(nsPresContext* aPresContext,
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PRUnichar* aText,
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PRInt32& aTextLength,
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nsCharType aCharType,
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PRBool aIsOddLevel,
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PRBool aIsBidiSystem);
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/**
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* Reorder Unicode text, taking into account bidi capabilities of the
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* platform. The reordering includes symmetric swapping and removing
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* control characters.
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*/
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nsresult ReorderUnicodeText(PRUnichar* aText,
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PRInt32& aTextLength,
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nsCharType aCharType,
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PRBool aIsOddLevel,
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PRBool aIsBidiSystem);
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/**
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* Return our nsBidi object (bidi reordering engine)
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*/
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nsresult GetBidiEngine(nsBidi** aBidiEngine);
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/**
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* Reorder plain text using the Unicode Bidi algorithm and send it to
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* a rendering context for rendering.
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*
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* @param[in] aText the string to be rendered (in logical order)
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* @param aLength the number of characters in the string
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* @param aBaseDirection the base direction of the string
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* NSBIDI_LTR - left-to-right string
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* NSBIDI_RTL - right-to-left string
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* @param aPresContext the presentation context
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* @param aRenderingContext the rendering context
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* @param aX the x-coordinate to render the string
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* @param aY the y-coordinate to render the string
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* @param[in,out] aPosResolve array of logical positions to resolve into visual positions; can be nsnull if this functionality is not required
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* @param aPosResolveCount number of items in the aPosResolve array
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*/
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nsresult RenderText(const PRUnichar* aText,
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PRInt32 aLength,
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nsBidiDirection aBaseDirection,
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nsPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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nscoord aX,
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nscoord aY,
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nsBidiPositionResolve* aPosResolve = nsnull,
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PRInt32 aPosResolveCount = 0);
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private:
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/**
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* Create a string containing entire text content of this block.
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*
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* @lina 05/02/2000
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*/
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void CreateBlockBuffer(nsPresContext* aPresContext);
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/**
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* Set up an array of the frames after splitting frames so that each frame has
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* consistent directionality. At this point the frames are still in logical
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* order
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*/
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nsresult InitLogicalArray(nsPresContext* aPresContext,
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nsIFrame* aCurrentFrame,
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nsIFrame* aNextInFlow,
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PRBool aAddMarkers = PR_FALSE);
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/**
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* Reorder the frame array from logical to visual order
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*
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* @param aPresContext the presentation context
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* @param aBidiEnabled TRUE on return if the visual order is different from
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* the logical order
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*/
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nsresult Reorder(nsPresContext* aPresContext,
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PRBool& aBidiEnabled);
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/**
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* Adjust frame positions following their visual order
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*
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* @param <code>nsPresContext*</code>, the first kid
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*
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* @lina 04/11/2000
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*/
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void RepositionInlineFrames(nsPresContext* aPresContext,
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nsIRenderingContext* aRendContext,
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nsIFrame* aFirstChild,
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PRInt32 aChildCount) const;
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void RepositionContainerFrame(nsPresContext* aPresContext,
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nsIFrame* aContainer,
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PRInt32& aMinX,
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PRInt32& aMaxX) const;
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/**
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* Helper method for Resolve()
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* Truncate a text frame and possibly create a continuation frame with the
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* remainder of its content.
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*
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* @param aPresContext the pres context
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* @param aContent the content of the frame
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* @param aFrame the original frame
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* @param aNewFrame [OUT] the new frame that was created
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* @param aFrameIndex [IN/OUT] index of aFrame in mLogicalFrames
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*
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* If there is already a bidi continuation for this frame in mLogicalFrames,
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* no new frame will be created. On exit aNewFrame will point to the existing
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* bidi continuation and aFrameIndex will contain its index.
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* @see Resolve()
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* @see RemoveBidiContinuation()
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*/
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PRBool EnsureBidiContinuation(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aFrame,
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nsIFrame** aNewFrame,
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PRInt32& aFrameIndex);
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/**
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* Helper method for Resolve()
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* Delete one or more bidi continuation frames created in a previous reflow by
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* EnsureBidiContinuation().
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* @param aPresContext the pres context
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* @param aFrame the frame whose continuations are to be removed
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* @param aFirstIndex index of aFrame in mLogicalFrames
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* @param aLastIndex index of the last frame to be removed
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* @param aOffset [OUT] count of directional frames removed. Since
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* directional frames have control characters
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* corresponding to them in mBuffer, the pointers to
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* mBuffer in Resolve() will need to be updated after
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* deleting the frames.
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*
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* @see Resolve()
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* @see EnsureBidiContinuation()
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*/
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void RemoveBidiContinuation(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRInt32& aOffset) const;
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void CalculateCharType(PRInt32& aOffset,
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PRInt32 aCharTypeLimit,
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PRInt32& aRunLimit,
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PRInt32& aRunLength,
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PRInt32& aRunCount,
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PRUint8& aCharType,
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PRUint8& aPrevCharType) const;
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void StripBidiControlCharacters(PRUnichar* aText,
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PRInt32& aTextLength) const;
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nsAutoString mBuffer;
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nsVoidArray mLogicalFrames;
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nsVoidArray mVisualFrames;
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nsDataHashtable<nsISupportsHashKey, PRInt32> mContentToFrameIndex;
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PRInt32 mArraySize;
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PRInt32* mIndexMap;
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PRUint8* mLevels;
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nsresult mSuccess;
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nsBidi* mBidiEngine;
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};
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#endif /* nsBidiPresUtils_h___ */
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#endif // IBMBIDI
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