зеркало из https://github.com/mozilla/gecko-dev.git
305 строки
12 KiB
C++
305 строки
12 KiB
C++
/* -*- 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
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* 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
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the NPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the NPL, the GPL or the LGPL.
|
|
*
|
|
* ***** 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
|
|
|
|
// See the description in nsIRenderingContext.h
|
|
NS_IMETHOD FlushRect(const nsRect& aRect);
|
|
NS_IMETHOD FlushRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight);
|
|
|
|
/**
|
|
* 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);
|
|
NS_IMETHOD UseBackbuffer(PRBool* aUseBackbuffer);
|
|
|
|
#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 */
|