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300 lines
11 KiB
C++
300 lines
11 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: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsRenderingContextImpl_h___
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#define nsRenderingContextImpl_h___
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#include "nsIRenderingContext.h"
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#include "nsPoint.h"
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#include "nsSize.h"
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typedef struct {
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double x; // x coordinate of edge's intersection with current scanline */
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double dx; // change in x with respect to y
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int i; // edge number: edge i goes from mPointList[i] to mPointList[i+1]
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} Edge;
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class NS_GFX nsRenderingContextImpl : public nsIRenderingContext
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{
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// CLASS MEMBERS
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public:
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protected:
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nsTransform2D *mTranMatrix; // The rendering contexts transformation matrix
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nsLineStyle mLineStyle; // The current linestyle, currenly used on mac, other platfroms to follow
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int mAct; // number of active edges
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Edge *mActive; // active edge list:edges crossing scanline y
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public:
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nsRenderingContextImpl();
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// CLASS METHODS
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/**
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* Gets the Pen Mode for the RenderingContext
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* @param aPenMode The Pen Mode to be retrieved
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* @return NS_OK if the Pen Mode is correctly retrieved
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*/
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NS_IMETHOD GetPenMode(nsPenMode &aPenMode) { return NS_ERROR_FAILURE;}
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/**
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* Sets the Pen Mode for the RenderingContext
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* @param aPenMode The Pen Mode
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* @return NS_OK if the Pen Mode is correctly set
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*/
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NS_IMETHOD SetPenMode(nsPenMode aPenMode) { return NS_ERROR_FAILURE;};
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/** ---------------------------------------------------
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* See documentation in nsIRenderingContext.h
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* @update 03/29/00 dwc
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*/
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NS_IMETHOD DrawPath(nsPathPoint aPointArray[],PRInt32 aNumPts);
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/** ---------------------------------------------------
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* See documentation in nsIRenderingContext.h
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* @update 03/29/00 dwc
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*/
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NS_IMETHOD FillPath(nsPathPoint aPointArray[],PRInt32 aNumPts);
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/**
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* Fill a poly in the current foreground color
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* @param aPoints points to use for the drawing, last must equal first
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* @param aNumPonts number of points in the polygon
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*/
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NS_IMETHOD RasterPolygon(const nsPoint aPoints[], PRInt32 aNumPoints);
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/** ---------------------------------------------------
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* See documentation in nsIRenderingContext.h
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* @update 05/01/00 dwc
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*/
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NS_IMETHOD DrawStdLine(nscoord aX0, nscoord aY0, nscoord aX1, nscoord aY1) { return NS_OK;}
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/** ---------------------------------------------------
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* See documentation in nsIRenderingContext.h
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* @update 05/01/00 dwc
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*/
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NS_IMETHOD FillStdPolygon(const nsPoint aPoints[], PRInt32 aNumPoints) { return NS_OK; }
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NS_IMETHOD GetBackbuffer(const nsRect &aRequestedSize, const nsRect &aMaxSize, nsDrawingSurface &aBackbuffer);
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NS_IMETHOD ReleaseBackbuffer(void);
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NS_IMETHOD DestroyCachedBackbuffer(void);
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#ifdef IBMBIDI
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/**
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* Let the device context know whether we want text reordered with
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* right-to-left base direction
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*/
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NS_IMETHOD SetRightToLeftText(PRBool aIsRTL);
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#endif // IBMBIDI
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#ifdef USE_IMG2
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NS_IMETHOD DrawImage(imgIContainer *aImage, const nsRect * aSrcRect, const nsPoint * aDestPoint);
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NS_IMETHOD DrawScaledImage(imgIContainer *aImage, const nsRect * aSrcRect, const nsRect * aDestRect);
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NS_IMETHOD DrawTile(imgIContainer *aImage, nscoord aXOffset, nscoord aYOffset, const nsRect * aTargetRect);
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NS_IMETHOD DrawScaledTile(imgIContainer *aImage, nscoord aXOffset, nscoord aYOffset, nscoord aTileWidth, nscoord aTileHeight, const nsRect * aTargetRect);
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#endif
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protected:
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virtual ~nsRenderingContextImpl();
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/** ---------------------------------------------------
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* Check to see if the given size of tile can be imaged by the RenderingContext
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* @update 03/29/00 dwc
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* @param aWidth The width of the tile
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* @param aHeight The height of the tile
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* @return PR_TRUE the RenderingContext can handle this tile
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*/
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virtual PRBool CanTile(nscoord aWidth,nscoord aHeight) { return PR_FALSE; }
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/** ---------------------------------------------------
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* A bit blitter to tile images to the background recursively
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* @update 3/29/00 dwc
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* @param aDS -- Target drawing surface for the rendering context
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* @param aSrcRect -- Rectangle we are build with the image
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* @param aHeight -- height of the tile
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* @param aWidth -- width of the tile
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*/
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void TileImage(nsDrawingSurface aDS,nsRect &aSrcRect,PRInt16 aWidth,PRInt16 aHeight);
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void cdelete(int i);
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void cinsert(int i,int y,const nsPoint aPointArray[],PRInt32 aNumPts);
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/**
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* Determine if a rect's width and height will fit within a specified width and height
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* @param aRect rectangle to test
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* @param aWidth width to determine if the rectangle's width will fit within
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* @param aHeight height to determine if the rectangles height will fit within
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* @returns PR_TRUE if the rect width and height fits with aWidth, aHeight, PR_FALSE
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* otherwise.
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*/
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PRBool RectFitsInside(const nsRect& aRect, PRInt32 aWidth, PRInt32 aHeight) const;
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/**
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* Determine if two rectangles width and height will fit within a specified width and height
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* @param aRect1 first rectangle to test
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* @param aRect1 second rectangle to test
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* @param aWidth width to determine if both rectangle's width will fit within
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* @param aHeight height to determine if both rectangles height will fit within
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* @returns PR_TRUE if the rect1's and rect2's width and height fits with aWidth,
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* aHeight, PR_FALSE otherwise.
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*/
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PRBool BothRectsFitInside(const nsRect& aRect1, const nsRect& aRect2, PRInt32 aWidth, PRInt32 aHeight, nsRect& aNewSize) const;
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/**
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* Return an offscreen surface size from a set of discrete surface sizes.
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* The smallest discrete surface size that can enclose both the Maximum widget
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* size (@see GetMaxWidgetBounds) and the requested size is returned.
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*
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* @param aMaxBackbufferSize Maximum size that may be requested for the backbuffer
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* @param aRequestedSize Requested size for the offscreen.
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* @param aSurfaceSize contains the surface size
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*/
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void CalculateDiscreteSurfaceSize(const nsRect& aMaxBackbufferSize, const nsRect& aRequestedSize, nsRect& aSize);
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/**
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* Get the size of the offscreen drawing surface..
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*
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* @param aMaxBackbufferSize Maximum size that may be requested for the backbuffer
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* @param aRequestedSize Desired size for the offscreen.
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* @param aSurfaceSize Offscreen adjusted to a discrete size which encloses aRequestedSize.
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*/
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void GetDrawingSurfaceSize(const nsRect& aMaxBackbufferSize, const nsRect& aRequestedSize, nsRect& aSurfaceSize);
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/**
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* Utility method used to implement NS_IMETHOD GetBackbuffer
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*
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* @param aRequestedSize size of the backbuffer area requested
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* @param aMaxSize maximum size that may be requested for the backbuffer
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* @param aBackbuffer drawing surface used as the backbuffer
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* @param aCacheBackbuffer PR_TRUE then the backbuffer will be cached, if PR_FALSE it is created each time
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*/
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nsresult AllocateBackbuffer(const nsRect &aRequestedSize, const nsRect &aMaxSize, nsDrawingSurface &aBackbuffer, PRBool aCacheBackbuffer);
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public:
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protected:
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nsPenMode mPenMode;
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private:
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static nsDrawingSurface gBackbuffer; //singleton backbuffer
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static nsRect gBackbufferBounds; //backbuffer bounds
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// Largest requested offscreen size if larger than a full screen.
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static nsSize gLargestRequestedSize;
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};
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/** ---------------------------------------------------
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* Class QBezierCurve, a quadratic bezier curve
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* @update 4/27/2000 dwc
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*/
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class QBezierCurve
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{
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public:
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nsFloatPoint mAnc1;
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nsFloatPoint mCon;
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nsFloatPoint mAnc2;
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QBezierCurve() {mAnc1.x=0;mAnc1.y=0;mCon=mAnc2=mAnc1;}
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void SetControls(nsFloatPoint &aAnc1,nsFloatPoint &aCon,nsFloatPoint &aAnc2) { mAnc1 = aAnc1; mCon = aCon; mAnc2 = aAnc2;}
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void SetPoints(nscoord a1x,nscoord a1y,nscoord acx,nscoord acy,nscoord a2x,nscoord a2y) {mAnc1.MoveTo(a1x,a1y),mCon.MoveTo(acx,acy),mAnc2.MoveTo(a2x,a2y);}
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void SetPoints(float a1x,float a1y,float acx,float acy,float a2x,float a2y) {mAnc1.MoveTo(a1x,a1y),mCon.MoveTo(acx,acy),mAnc2.MoveTo(a2x,a2y);}
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void DebugPrint();
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/** ---------------------------------------------------
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* Divide a Quadratic curve into line segments if it is not smaller than a certain size
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* else it is so small that it can be approximated by 2 lineto calls
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* @param aRenderingContext -- The RenderingContext to use to draw with
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* @update 3/26/99 dwc
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*/
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void SubDivide(nsIRenderingContext *aRenderingContext);
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/** ---------------------------------------------------
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* Divide a Quadratic curve into line segments if it is not smaller than a certain size
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* else it is so small that it can be approximated by 2 lineto calls
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* @param nsPoint* -- The points array to rasterize into
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* @param aNumPts* -- Current number of points in this array
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* @update 3/26/99 dwc
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*/
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void SubDivide(nsPoint aThePoints[],PRInt16 *aNumPts);
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/** ---------------------------------------------------
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* Divide a Quadratic Bezier curve at the mid-point
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* @update 3/26/99 dwc
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* @param aCurve1 -- Curve 1 as a result of the division
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* @param aCurve2 -- Curve 2 as a result of the division
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*/
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void MidPointDivide(QBezierCurve *A,QBezierCurve *B);
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};
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enum eSegType {eUNDEF,eLINE,eQCURVE,eCCURVE};
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/** ---------------------------------------------------
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* A class to iterate through a nsPathPoint array and return segments
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* @update 04/27/00 dwc
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*/
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class nsPathIter {
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public:
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enum eSegType {eUNDEF,eLINE,eQCURVE,eCCURVE};
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private:
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PRUint32 mCurPoint;
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PRUint32 mNumPoints;
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nsPathPoint *mThePath;
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public:
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nsPathIter();
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nsPathIter(nsPathPoint* aThePath,PRUint32 aNumPts);
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PRBool NextSeg(QBezierCurve& TheSegment,eSegType& aCurveType);
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};
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#endif /* nsRenderingContextImpl */
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