Advanced Strategic Command: basegfx.h File Reference

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Classes
struct	tgraphmodeparameters
	a graphical surface. More...
struct	trleheader
class	tdrawline
	An abstract class that draws a line. More...
class	tvirtualdisplay
	A virtual screen is allocated and the agmp pointer set to it. More...
struct	trgbpixel
	A class for a single pixel. More...
class	TrueColorImage
	A class for a RGB image. Was an attempt to rewrite the graphics engine, but should be scrapped. Any new code should use SDLmm-Surfaces. More...
class	fatalgraphicserror
	a class that is thrown as exception. Should be moved to error.h ... More...
class	collategraphicoperations
	Collects all graphic operations and updates the screen on destruction When porting ASC from DOS to SDL, the problem arose that under DOS all graphic operations directly modified the graphics memory and were directly visible without any overhead. More...
Defines
#define	alphabase 64
#define	TCalpha 0xfefefe
Functions
void	bar (int x1, int y1, int x2, int y2, char color)
	paints a colored bar
void	getimage (int x1, int y1, int x2, int y2, void *buffer)
	copy an image to a buffer. buffer must have been alloced before with malloc ( imagesize ( x1,y1,x2,y2 ))
void	putimage (int x1, int y1, void *buffer)
	puts the image pointed to by buffer to the screen
void	putxlatfilter (int x1, int y1, void pictbuffer, char xlattables)
	puts the image in pictbuffer on the screen performing a color translation.
void	putspriteimage (int x1, int y1, void *buffer)
	puts the image pointed to by buffer on the screen. All pixels with color #255 are treated as transparent
void	putrotspriteimage (int x1, int y1, void *buffer, int rotationvalue)
	like putspriteimage, but all color with an 16 <= colorIndex <= 23 are increased by rotationvalue.
void	putrotspriteimage90 (int x1, int y1, void *buffer, int rotationvalue)
	like putspriteimage, but rotates the image by 90 clock-wise
void	putrotspriteimage180 (int x1, int y1, void *buffer, int rotationvalue)
	like putspriteimage, but rotates the image by 180 clock-wise
void	putrotspriteimage270 (int x1, int y1, void *buffer, int rotationvalue)
	like putspriteimage, but rotates the image by 270 clock-wise
void	puttexture (int x1, int y1, int x2, int y2, void *texture)
	function not used any more and obsolete. Use putimageprt instead
void	putspritetexture (int x1, int y1, int x2, int y2, void *texture)
	Puts a part of texture on the screen.
void	putimageprt (int x1, int y1, int x2, int y2, void *texture, int dx, int dy)
	copies a part of texture to the screen.
int	loga2 (int a)
	returns the position of the lowest bit of a which is set. This equals an inter logarithm to the base of 2
SPoint	getPixelRotationLocation (SPoint pos, int width, int height, int degrees)
	transforms the coordinate for an image rotation
void	putpixel (int x1, int y1, int color)
	puts a single pixel on the screen. This is one of the few functions that work in truecolor mode too
int	getpixel (int x1, int y1)
	gets the color of a single pixel from the screen. This is one of the few functions that work in truecolor mode too
int	imagesize (int x1, int y1, int x2, int y2)
	returns the size for a buffer that can contain an image of the given size.
void	getpicsize (void *p, int &width, int &height)
	write the dimension of the image p to width and height
int	getpicsize2 (void *p)
	returns the size that the picture p occupies in memory
void *	uncompress_rlepict (void *pict)
	uncompresses the RLE-compressed image pict.
void	generategrayxlattable (ppixelxlattable tab, char offset, char size, dacpalette256 *pal)
	A translation table ( to be used by xlatpict ) is generated to translate any color of palette pal to its gray value.
void	rahmen (bool invers, int x1, int y1, int x2, int y2)
	paints a pseudo-3D rectangle on the screen.
void	line (int x1, int y1, int x2, int y2, char color)
	draws a simple line on the screen. Not very fast...
void	xorline (int x1, int y1, int x2, int y2, char color)
	draws a simple line on the screen, but performs a XOR operation between the pixel already on screen and color.
void	rectangle (int x1, int y1, int x2, int y2, char color)
	draws a simple rectangl
void	xorrectangle (int x1, int y1, int x2, int y2, char color)
	draws a simple rectangle on the screen, but performs a XOR operation between the pixel already on screen and color.
void	putinterlacedrotimage (int x1, int y1, void *ptr, int rotation)
	obsolete. not used any more. can be removed.
void	rotatepict90 (void s, void d)
	rotates the image s by 90 clockwise and writes it to d.
void	flippict (void s, void d, int dir=1)
	mirrors a picture horizontally (dir=1) or vertically (dir=0).
void *	halfpict (void *vbuf)
	reduces a pictures size.
char *	rotatepict (void *image, int angle)
	rotates the picture image by angle clockwise.
char *	rotatepict_grw (void *image, int organgle)
	rotates the picture image by angle clockwise.
int	getpixelfromimage (void *buf, int x, int y)
	returns the pixel at position x/y of the image buf or -1 if the pixel does not exist
void	ellipse (int x1, int y1, int x2, int y2, int color, float tolerance)
	paints an ellipse on the screen that fills the rectangle x1/y1 - x2/y2.
void	putmask (int x1, int y1, void *vbuf, int newtransparence)
	puts an image on the screen , with all pixels of newtransparence treated as transparent.
void	putpicturemix (int x1, int y1, void ptr, int rotation, char mixbuf)
	puts the image ptr on the screen, mixing it with the colors there.
void	copySurface2screen (void)
	when using SDL, all operations are not performed on the displaymemory itself (as is the case with DOS), but on a buffer.
void	copySurface2screen (int x1, int y1, int x2, int y2)
char *	convertimage (TrueColorImage *img, dacpalette256 pal)
	the truecolor image img is reduced to 8 bit color using the palette pal.
void	putimage (int x1, int y1, TrueColorImage *tci)
	puts the image pointed to by tci to the screen. Both must be truecolor images. This function is a quick and unoptimized hack!
void	putimage_noalpha (int x1, int y1, TrueColorImage *tci)
TrueColorImage *	smoothimage (TrueColorImage *src)
TrueColorImage *	getimage (int x1, int y1, int x2, int y2)
void	setWindowCaption (const char *s)
	sets the caption of the main window
Variables
const int	colorDepth = 4
const int	black = 0
const int	blue = 1
const int	green = 2
const int	cyan = 3
const int	red = 4
const int	magenta = 5
const int	brown = 6
const int	lightgray = 7
const int	darkgray = 8
const int	lightblue = 9
const int	lightgreen = 42
const int	lightcyan = 119
const int	lightred = 52
const int	lightmagenta = 5
const int	yellow = 103
const int	white = 160
tgraphmodeparameters *	agmp
tgraphmodeparameters *	hgmp
dacpalette256 *	activepalette256
tgraphmodeparameters	activegraphmodeparameters
tgraphmodeparameters	hardwaregraphmodeparameters
dacpalette256	activepalette
void *	xlatbuffer

Detailed Description

basegfx.h additionally includes the definitions of routines, whose implementation is platform dependant, but whose interface is the same on all platforms. Their implementation is in the various subdirectories for the platforms. The graphic routines are older than ASC itself, first written in 1993 as a protected mode replacement for Borlands BGI. (That's why the uncompressed image structure is exactly the same as in the BGI).

the code here is being replaced by the new graphics system found in the graphics subdirectory

Define Documentation

#define alphabase 64

Definition at line 348 of file basegfx.h.

Referenced by getimage(), putimage_noalpha(), putpixel(), and smoothimage().

#define TCalpha 0xfefefe

Definition at line 351 of file basegfx.h.

Referenced by putimage_noalpha().

Function Documentation

void bar	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		char	color
	)

paints a colored bar

Definition at line 1239 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by tparagraph::checkscrolldown(), tviewtext::displaytext(), tviewtext::fillline(), PlayerColorPanel::PlayerColorPanel(), and tviewtext::setnewlineheight().

char* convertimage	(	TrueColorImage *	img,
		dacpalette256	pal
	)

the truecolor image img is reduced to 8 bit color using the palette pal.

A new buffer is allocated and returned. It must be freed after use.

void copySurface2screen	(	int	x1,
		int	y1,
		int	x2,
		int	y2
	)

Definition at line 1214 of file basegfx.cpp.

References agmp, copy2screen(), and tgraphmodeparameters::directscreenaccess.

void copySurface2screen ( void )

when using SDL, all operations are not performed on the displaymemory itself (as is the case with DOS), but on a buffer.

This function copies the buffer to the screen, performing a color conversion if necessary

Definition at line 1208 of file basegfx.cpp.

References agmp, copy2screen(), and tgraphmodeparameters::directscreenaccess.

void ellipse	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	color,
		float	tolerance
	)

paints an ellipse on the screen that fills the rectangle x1/y1 - x2/y2.

The thickness of the ellipse depends on tolerance. This function is just for highlighting elements on the screen, not for drawing nice and mathematically correct ellipse

Definition at line 1043 of file basegfx.cpp.

References putpixel().

void flippict	(	void *	s,
		void *	d,
		int	dir = `1`
	)

mirrors a picture horizontally (dir=1) or vertically (dir=0).

d must point to a buffer with the size of imagesize2(s)

Definition at line 675 of file basegfx.cpp.

void generategrayxlattable	(	ppixelxlattable	tab,
		char	offset,
		char	size,
		dacpalette256 *	pal
	)

A translation table ( to be used by xlatpict ) is generated to translate any color of palette pal to its gray value.

The new pixels after the translation are still to be used with the palette pal. offset and size specify a range of colors that are assumed to be a linear transition from white to black. So all colors are mapped to one of the colors of the offset-size range.

Definition at line 44 of file basegfx.cpp.

Referenced by loadpalette().

TrueColorImage* getimage	(	int	x1,
		int	y1,
		int	x2,
		int	y2
	)

Definition at line 1360 of file basegfx.cpp.

References alphabase, getpixel(), TrueColorImage::getxsize(), TrueColorImage::getysize(), and TrueColorImage::setpix().

void getimage	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		void *	buffer
	)

copy an image to a buffer. buffer must have been alloced before with malloc ( imagesize ( x1,y1,x2,y2 ))

Definition at line 1256 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void getpicsize	(	void *	p,
		int &	width,
		int &	height
	)

write the dimension of the image p to width and height

Definition at line 52 of file basegfx.cpp.

References trleheader::id, trleheader::size, trleheader::x, and trleheader::y.

Referenced by getimagepixel(), UnitPropertyEditor::init(), rotatepict(), rotatepict_grw(), and uncompress_rlepict().

int getpicsize2 ( void * p )

returns the size that the picture p occupies in memory

Definition at line 64 of file basegfx.cpp.

References trleheader::id, and trleheader::size.

int getpixel	(	int	x1,
		int	y1
	)

gets the color of a single pixel from the screen. This is one of the few functions that work in truecolor mode too

Definition at line 760 of file basegfx.cpp.

References agmp, tgraphmodeparameters::bluefieldposition, tgraphmodeparameters::byteperpix, trgbpixel::channel, getpixel8(), tgraphmodeparameters::greenfieldposition, tgraphmodeparameters::linearaddress, tgraphmodeparameters::redfieldposition, trgbpixel::rgb, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by getimage(), writepcx(), and xorline().

int getpixelfromimage	(	void *	buf,
		int	x,
		int	y
	)

returns the pixel at position x/y of the image buf or -1 if the pixel does not exist

Definition at line 798 of file basegfx.cpp.

Referenced by putimageprt(), putrotspriteimage180(), putrotspriteimage270(), and putrotspriteimage90().

SPoint getPixelRotationLocation	(	SPoint	pos,
		int	width,
		int	height,
		int	degrees
	)

transforms the coordinate for an image rotation

Definition at line 1999 of file basegfx.cpp.

Referenced by SourcePixelSelector_Rotation< pixelsize >::getPixel(), SourcePixelSelector_CacheRotation< pixelsize >::nextPixel(), rotateSurface(), and SourcePixelSelector_CacheRotation< pixelsize >::setAngle().

void* halfpict ( void * vbuf )

reduces a pictures size.

The new picture will have half the size in x and y direction, resulting in a quarting of the area. The new image will be written to a static buffer that is overwritten the next time halfpict or xlatpict is called. The address of the buffer is returned.

Definition at line 337 of file basegfx.cpp.

References trleheader::id, trleheader::rle, trleheader::size, trleheader::x, xlatbuffer, xlatbuffersize, and trleheader::y.

int imagesize	(	int	x1,
		int	y1,
		int	x2,
		int	y2
	)

returns the size for a buffer that can contain an image of the given size.

Definition at line 896 of file basegfx.cpp.

Referenced by tdialogbox::buildgraphics(), tdialogbox::execbutton(), tdialogbox::knopfdruck(), tdialogbox::newknopfdruck(), tdialogbox::newknopfdruck2(), tdialogbox::newknopfdruck3(), tdialogbox::newknopfdruck4(), rotatepict(), rotatepict_grw(), and Surface::toBGI().

void line	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		char	color
	)

draws a simple line on the screen. Not very fast...

Definition at line 181 of file basegfx.cpp.

References putpixel().

Referenced by tdialogbox::disablebutton(), tdialogbox::enablebutton(), ASC_PBEM::getCurrentGamesInfo(), ASC_PBEM::getUserList(), BuildingValues::init(), lines(), MailOptionsDialog::MailOptionsDialog(), tdialogbox::newknopfdruck(), tdialogbox::newknopfdruck2(), LuaCommandListWriter< list< ASCString > >::outputLine(), TextFormatParser::parseLine(), rahmen(), tdialogbox::rahmen(), tdialogbox::rahmen3(), rectangle(), LuaRunner::runFile(), showplayerstat(), tdialogbox::toggleswitch(), tshowhistorypaintstat(), and WeaponInfoPanel::WeaponInfoPanel().

int loga2 ( int a )

returns the position of the lowest bit of a which is set. This equals an inter logarithm to the base of 2

Definition at line 1793 of file basegfx.cpp.

void putimage	(	int	x1,
		int	y1,
		TrueColorImage *	tci
	)

puts the image pointed to by tci to the screen. Both must be truecolor images. This function is a quick and unoptimized hack!

The 6 most significant bits of each color component (RGB) form the the index.

Definition at line 1334 of file basegfx.cpp.

References TrueColorImage::getpix(), TrueColorImage::getxsize(), TrueColorImage::getysize(), and putpixel().

void putimage	(	int	x1,
		int	y1,
		void *	buffer
	)

puts the image pointed to by buffer to the screen

Definition at line 1280 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, trleheader::id, tgraphmodeparameters::linearaddress, trleheader::rle, tgraphmodeparameters::scanlinelength, trleheader::size, tgraphmodeparameters::windowstatus, trleheader::x, and trleheader::y.

void putimage_noalpha	(	int	x1,
		int	y1,
		TrueColorImage *	tci
	)

Definition at line 1343 of file basegfx.cpp.

References alphabase, TrueColorImage::getpix(), TrueColorImage::getxsize(), TrueColorImage::getysize(), putpixel(), and TCalpha.

void putimageprt	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		void *	texture,
		int	dx,
		int	dy
	)

copies a part of texture to the screen.

Texture and the screen may have different size. x1/y1 and x2/y2 is the rectangle of the screen that texture is copied to. dx/dy is the offset between x1/y1 and the upper left corner of texture. If dx==0 and dy==1, the uppermost line of texture would not be displayed. The rectangle x1/y1 - x2/y2 may be larger than texture.

Definition at line 1693 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, getpixelfromimage(), tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by tviewtext::displaysingleline().

void putinterlacedrotimage	(	int	x1,
		int	y1,
		void *	ptr,
		int	rotation
	)

obsolete. not used any more. can be removed.

Definition at line 477 of file basegfx.cpp.

References agmp, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void putmask	(	int	x1,
		int	y1,
		void *	vbuf,
		int	newtransparence
	)

puts an image on the screen , with all pixels of newtransparence treated as transparent.

Definition at line 975 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, tgraphmodeparameters::bytesperscanline, and tgraphmodeparameters::linearaddress.

void putpicturemix	(	int	x1,
		int	y1,
		void *	ptr,
		int	rotation,
		char *	mixbuf
	)

puts the image ptr on the screen, mixing it with the colors there.

Mixbuf must point to 256*256 byte large structure, where mixbuf[a][b] contains the colors that results from mixing a and b.

Definition at line 449 of file basegfx.cpp.

References agmp, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void putpixel	(	int	x1,
		int	y1,
		int	color
	)

puts a single pixel on the screen. This is one of the few functions that work in truecolor mode too

Definition at line 717 of file basegfx.cpp.

References agmp, alphabase, tgraphmodeparameters::bluefieldposition, tgraphmodeparameters::byteperpix, tgraphmodeparameters::greenfieldposition, tgraphmodeparameters::linearaddress, putpixel8(), tgraphmodeparameters::redfieldposition, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by ellipse(), line(), putimage(), putimage_noalpha(), tmapgenerator::showmontlayer(), and xorline().

void putrotspriteimage	(	int	x1,
		int	y1,
		void *	buffer,
		int	rotationvalue
	)

like putspriteimage, but all color with an 16 <= colorIndex <= 23 are increased by rotationvalue.

This is used to display colored units. The mentioned color range are the red colors, which can be made blue by adding 8 to them, 16 makes them brown, etc..

Definition at line 1496 of file basegfx.cpp.

void putrotspriteimage180	(	int	x1,
		int	y1,
		void *	buffer,
		int	rotationvalue
	)

like putspriteimage, but rotates the image by 180 clock-wise

Definition at line 1594 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, getpixelfromimage(), tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void putrotspriteimage270	(	int	x1,
		int	y1,
		void *	buffer,
		int	rotationvalue
	)

like putspriteimage, but rotates the image by 270 clock-wise

Definition at line 1621 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, getpixelfromimage(), tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void putrotspriteimage90	(	int	x1,
		int	y1,
		void *	buffer,
		int	rotationvalue
	)

like putspriteimage, but rotates the image by 90 clock-wise

Definition at line 1567 of file basegfx.cpp.

References agmp, tgraphmodeparameters::byteperpix, getpixelfromimage(), tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

void putspriteimage	(	int	x1,
		int	y1,
		void *	buffer
	)

puts the image pointed to by buffer on the screen. All pixels with color #255 are treated as transparent

Definition at line 1439 of file basegfx.cpp.

Referenced by UnitPropertyEditor::init().

void putspritetexture	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		void *	texture
	)

Puts a part of texture on the screen.

Texture must be the same size as the screen, so the coordinates x1/y1 and x2/y2 describe the same rectangle on texture and the screen. This rectangle is copied from texture to the screen. color #255 is treated as transparent

Definition at line 1670 of file basegfx.cpp.

References agmp, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by tdialogbox::copyvirtualframebuf().

void puttexture	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		void *	texture
	)

function not used any more and obsolete. Use putimageprt instead

Definition at line 1648 of file basegfx.cpp.

References agmp, tgraphmodeparameters::linearaddress, tgraphmodeparameters::scanlinelength, and tgraphmodeparameters::windowstatus.

Referenced by tdialogbox::paintsurface2().

void putxlatfilter	(	int	x1,
		int	y1,
		void *	pictbuffer,
		char *	xlattables
	)

puts the image in pictbuffer on the screen performing a color translation.

xlattables points to an array of n*256 byte. n must be equal or greater than the highest pixel in pictbuffer. Example: you want to paint the tracks on the screen which are left by heavy vehicles. There is an image of a track which contains just pixels of 0, 1 and two. You now provide a set of 3 tables each 256 bytes large. The first one just counts from 0 to 255 The second one has color values that are a bit darker than the original: If color #2 was blue, table[2] would have the index of a dark blue color. The third table is like the second one, but points to even darker colors. If you now paint the track using this function: where there is color #0 in the track image, the pixel on the screen would be unchanged where there is color #1 in the track image, the pixel on the screen is made darker and where there is color #2, the pixel on the screen is becoming even more darker Ok, that's all. A very specialized function. I just checked and noticed that it is not used any more by ASC. Damn, why did I write this description instead of just deleting this procedure ;-)

Definition at line 1375 of file basegfx.cpp.

void rahmen	(	bool	invers,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

paints a pseudo-3D rectangle on the screen.

invers specifies wheather the rectangle seems to be pressed into the screen or coming out

Definition at line 82 of file basegfx.cpp.

References darkgray, line(), and white.

Referenced by tshowhistoryinit().

void rectangle	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		char	color
	)

draws a simple rectangl

Definition at line 297 of file basegfx.cpp.

References line().

char* rotatepict	(	void *	image,
		int	angle
	)

rotates the picture image by angle clockwise.

The resulting image will have exactly the same size as the original image, resulting in the image being clipped

Definition at line 553 of file basegfx.cpp.

References fieldxsize, fieldysize, getimagepixel(), getpicsize(), and imagesize().

Referenced by UnitPropertyEditor::init().

void rotatepict90	(	void *	s,
		void *	d
	)

rotates the image s by 90 clockwise and writes it to d.

d must point to a buffer with the size of imagesize2(s)

Definition at line 506 of file basegfx.cpp.

char* rotatepict_grw	(	void *	image,
		int	organgle
	)

rotates the picture image by angle clockwise.

The resulting image will be larger than the original one

Definition at line 613 of file basegfx.cpp.

References fieldxsize, fieldysize, getimagepixel(), getpicsize(), and imagesize().

void setWindowCaption ( const char * s )

sets the caption of the main window

Definition at line 34 of file graphics.cpp.

Referenced by main().

TrueColorImage* smoothimage ( TrueColorImage * src )

Definition at line 853 of file basegfx.cpp.

References alphabase, trgbpixel::channel, TrueColorImage::getpix(), TrueColorImage::getxsize(), TrueColorImage::getysize(), and TrueColorImage::setpix().

void* uncompress_rlepict ( void * pict )

uncompresses the RLE-compressed image pict.

A buffer for the uncompressed image is allocated and returned, so it must be freed later

Definition at line 1001 of file basegfx.cpp.

References getpicsize(), trleheader::id, malloc(), trleheader::rle, and trleheader::size.

Referenced by Surface::read().

void xorline	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		char	color
	)

draws a simple line on the screen, but performs a XOR operation between the pixel already on screen and color.

Thus the line will always have a color different then the one that was previously there. And it can be undone by displaying it a second time.

Definition at line 241 of file basegfx.cpp.

References getpixel(), and putpixel().

Referenced by tparagraph::displaycursor(), tdialogbox::lne(), and xorrectangle().

void xorrectangle	(	int	x1,
		int	y1,
		int	x2,
		int	y2,
		char	color
	)

draws a simple rectangle on the screen, but performs a XOR operation between the pixel already on screen and color.

Thus the rectangle will always have a color different then the one that was previously there. And it can be undone by displaying it a second time.

Definition at line 313 of file basegfx.cpp.

References xorline().

Referenced by tdialogbox::run(), and tdialogbox::showtabmark().

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