gecko-dev/gfx/public/nsRenderingContextImpl.h

300 lines
11 KiB
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#ifndef nsRenderingContextImpl_h___
#define nsRenderingContextImpl_h___
#include "nsIRenderingContext.h"
#include "nsPoint.h"
#include "nsSize.h"
typedef struct {
double x; // x coordinate of edge's intersection with current scanline */
double dx; // change in x with respect to y
int i; // edge number: edge i goes from mPointList[i] to mPointList[i+1]
} Edge;
class NS_GFX nsRenderingContextImpl : public nsIRenderingContext
{
// CLASS MEMBERS
public:
protected:
nsTransform2D *mTranMatrix; // The rendering contexts transformation matrix
nsLineStyle mLineStyle; // The current linestyle, currenly used on mac, other platfroms to follow
int mAct; // number of active edges
Edge *mActive; // active edge list:edges crossing scanline y
public:
nsRenderingContextImpl();
// CLASS METHODS
/**
* Gets the Pen Mode for the RenderingContext
* @param aPenMode The Pen Mode to be retrieved
* @return NS_OK if the Pen Mode is correctly retrieved
*/
NS_IMETHOD GetPenMode(nsPenMode &aPenMode) { return NS_ERROR_FAILURE;}
/**
* Sets the Pen Mode for the RenderingContext
* @param aPenMode The Pen Mode
* @return NS_OK if the Pen Mode is correctly set
*/
NS_IMETHOD SetPenMode(nsPenMode aPenMode) { return NS_ERROR_FAILURE;};
/** ---------------------------------------------------
* See documentation in nsIRenderingContext.h
* @update 03/29/00 dwc
*/
NS_IMETHOD DrawPath(nsPathPoint aPointArray[],PRInt32 aNumPts);
/** ---------------------------------------------------
* See documentation in nsIRenderingContext.h
* @update 03/29/00 dwc
*/
NS_IMETHOD FillPath(nsPathPoint aPointArray[],PRInt32 aNumPts);
/**
* Fill a poly in the current foreground color
* @param aPoints points to use for the drawing, last must equal first
* @param aNumPonts number of points in the polygon
*/
NS_IMETHOD RasterPolygon(const nsPoint aPoints[], PRInt32 aNumPoints);
/** ---------------------------------------------------
* See documentation in nsIRenderingContext.h
* @update 05/01/00 dwc
*/
NS_IMETHOD DrawStdLine(nscoord aX0, nscoord aY0, nscoord aX1, nscoord aY1) { return NS_OK;}
/** ---------------------------------------------------
* See documentation in nsIRenderingContext.h
* @update 05/01/00 dwc
*/
NS_IMETHOD FillStdPolygon(const nsPoint aPoints[], PRInt32 aNumPoints) { return NS_OK; }
NS_IMETHOD GetBackbuffer(const nsRect &aRequestedSize, const nsRect &aMaxSize, nsDrawingSurface &aBackbuffer);
NS_IMETHOD ReleaseBackbuffer(void);
NS_IMETHOD DestroyCachedBackbuffer(void);
#ifdef IBMBIDI
/**
* Let the device context know whether we want text reordered with
* right-to-left base direction
*/
NS_IMETHOD SetRightToLeftText(PRBool aIsRTL);
#endif // IBMBIDI
#ifdef USE_IMG2
NS_IMETHOD DrawImage(imgIContainer *aImage, const nsRect * aSrcRect, const nsPoint * aDestPoint);
NS_IMETHOD DrawScaledImage(imgIContainer *aImage, const nsRect * aSrcRect, const nsRect * aDestRect);
NS_IMETHOD DrawTile(imgIContainer *aImage, nscoord aXOffset, nscoord aYOffset, const nsRect * aTargetRect);
NS_IMETHOD DrawScaledTile(imgIContainer *aImage, nscoord aXOffset, nscoord aYOffset, nscoord aTileWidth, nscoord aTileHeight, const nsRect * aTargetRect);
#endif
protected:
virtual ~nsRenderingContextImpl();
/** ---------------------------------------------------
* Check to see if the given size of tile can be imaged by the RenderingContext
* @update 03/29/00 dwc
* @param aWidth The width of the tile
* @param aHeight The height of the tile
* @return PR_TRUE the RenderingContext can handle this tile
*/
virtual PRBool CanTile(nscoord aWidth,nscoord aHeight) { return PR_FALSE; }
/** ---------------------------------------------------
* A bit blitter to tile images to the background recursively
* @update 3/29/00 dwc
* @param aDS -- Target drawing surface for the rendering context
* @param aSrcRect -- Rectangle we are build with the image
* @param aHeight -- height of the tile
* @param aWidth -- width of the tile
*/
void TileImage(nsDrawingSurface aDS,nsRect &aSrcRect,PRInt16 aWidth,PRInt16 aHeight);
void cdelete(int i);
void cinsert(int i,int y,const nsPoint aPointArray[],PRInt32 aNumPts);
/**
* Determine if a rect's width and height will fit within a specified width and height
* @param aRect rectangle to test
* @param aWidth width to determine if the rectangle's width will fit within
* @param aHeight height to determine if the rectangles height will fit within
* @returns PR_TRUE if the rect width and height fits with aWidth, aHeight, PR_FALSE
* otherwise.
*/
PRBool RectFitsInside(const nsRect& aRect, PRInt32 aWidth, PRInt32 aHeight) const;
/**
* Determine if two rectangles width and height will fit within a specified width and height
* @param aRect1 first rectangle to test
* @param aRect1 second rectangle to test
* @param aWidth width to determine if both rectangle's width will fit within
* @param aHeight height to determine if both rectangles height will fit within
* @returns PR_TRUE if the rect1's and rect2's width and height fits with aWidth,
* aHeight, PR_FALSE otherwise.
*/
PRBool BothRectsFitInside(const nsRect& aRect1, const nsRect& aRect2, PRInt32 aWidth, PRInt32 aHeight, nsRect& aNewSize) const;
/**
* Return an offscreen surface size from a set of discrete surface sizes.
* The smallest discrete surface size that can enclose both the Maximum widget
* size (@see GetMaxWidgetBounds) and the requested size is returned.
*
* @param aMaxBackbufferSize Maximum size that may be requested for the backbuffer
* @param aRequestedSize Requested size for the offscreen.
* @param aSurfaceSize contains the surface size
*/
void CalculateDiscreteSurfaceSize(const nsRect& aMaxBackbufferSize, const nsRect& aRequestedSize, nsRect& aSize);
/**
* Get the size of the offscreen drawing surface..
*
* @param aMaxBackbufferSize Maximum size that may be requested for the backbuffer
* @param aRequestedSize Desired size for the offscreen.
* @param aSurfaceSize Offscreen adjusted to a discrete size which encloses aRequestedSize.
*/
void GetDrawingSurfaceSize(const nsRect& aMaxBackbufferSize, const nsRect& aRequestedSize, nsRect& aSurfaceSize);
/**
* Utility method used to implement NS_IMETHOD GetBackbuffer
*
* @param aRequestedSize size of the backbuffer area requested
* @param aMaxSize maximum size that may be requested for the backbuffer
* @param aBackbuffer drawing surface used as the backbuffer
* @param aCacheBackbuffer PR_TRUE then the backbuffer will be cached, if PR_FALSE it is created each time
*/
nsresult AllocateBackbuffer(const nsRect &aRequestedSize, const nsRect &aMaxSize, nsDrawingSurface &aBackbuffer, PRBool aCacheBackbuffer);
public:
protected:
nsPenMode mPenMode;
private:
static nsDrawingSurface gBackbuffer; //singleton backbuffer
static nsRect gBackbufferBounds; //backbuffer bounds
// Largest requested offscreen size if larger than a full screen.
static nsSize gLargestRequestedSize;
};
/** ---------------------------------------------------
* Class QBezierCurve, a quadratic bezier curve
* @update 4/27/2000 dwc
*/
class QBezierCurve
{
public:
nsFloatPoint mAnc1;
nsFloatPoint mCon;
nsFloatPoint mAnc2;
QBezierCurve() {mAnc1.x=0;mAnc1.y=0;mCon=mAnc2=mAnc1;}
void SetControls(nsFloatPoint &aAnc1,nsFloatPoint &aCon,nsFloatPoint &aAnc2) { mAnc1 = aAnc1; mCon = aCon; mAnc2 = aAnc2;}
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);}
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);}
void DebugPrint();
/** ---------------------------------------------------
* Divide a Quadratic curve into line segments if it is not smaller than a certain size
* else it is so small that it can be approximated by 2 lineto calls
* @param aRenderingContext -- The RenderingContext to use to draw with
* @update 3/26/99 dwc
*/
void SubDivide(nsIRenderingContext *aRenderingContext);
/** ---------------------------------------------------
* Divide a Quadratic curve into line segments if it is not smaller than a certain size
* else it is so small that it can be approximated by 2 lineto calls
* @param nsPoint* -- The points array to rasterize into
* @param aNumPts* -- Current number of points in this array
* @update 3/26/99 dwc
*/
void SubDivide(nsPoint aThePoints[],PRInt16 *aNumPts);
/** ---------------------------------------------------
* Divide a Quadratic Bezier curve at the mid-point
* @update 3/26/99 dwc
* @param aCurve1 -- Curve 1 as a result of the division
* @param aCurve2 -- Curve 2 as a result of the division
*/
void MidPointDivide(QBezierCurve *A,QBezierCurve *B);
};
enum eSegType {eUNDEF,eLINE,eQCURVE,eCCURVE};
/** ---------------------------------------------------
* A class to iterate through a nsPathPoint array and return segments
* @update 04/27/00 dwc
*/
class nsPathIter {
public:
enum eSegType {eUNDEF,eLINE,eQCURVE,eCCURVE};
private:
PRUint32 mCurPoint;
PRUint32 mNumPoints;
nsPathPoint *mThePath;
public:
nsPathIter();
nsPathIter(nsPathPoint* aThePath,PRUint32 aNumPts);
PRBool NextSeg(QBezierCurve& TheSegment,eSegType& aCurveType);
};
#endif /* nsRenderingContextImpl */