GDeviceContext Class Reference

Base class for a graphics content, a plane that graphics primitives can be drawn. More...

#include <Gdc2.h>

Inheritance diagram for GDeviceContext:

List of all members.

Public Member Functions
virtual bool	IsAlpha ()
	Returns true if this Surface has an alpha channel.
virtual bool	IsAlpha (bool b)
	Creates or destroys the alpha channel for this surface.
bool	DrawOnAlpha ()
	Returns true if we are drawing on the alpha channel.
bool	DrawOnAlpha (bool Draw)
	True if you want to edit the alpha channel rather than the colour bits.
GSurface *	AlphaDC ()
	Returns the surface of the alpha channel.
virtual COLOUR	Colour ()
	Gets the current colour.
virtual COLOUR	Colour (COLOUR c, int Bits=0)
	Sets the current colour.
virtual int	Op ()
	Gets the current blending mode in operation.
virtual int	Op (int Op)
virtual int	X ()
	Gets the width in pixels.
virtual int	Y ()
	Gets the height in pixels.
virtual int	DpiX ()
	Returns the horizontal resolution of the device.
virtual int	DpiY ()
	Returns the vertical resolution of the device.
virtual int	GetBits ()
	Gets the bits per pixel.
virtual int	PixelSize ()
	Gets the bytes per pixels.
virtual bool	IsScreen ()
	Returns true if the surface is on the screen.
virtual bool	IsPrint ()
	Returns true if the surface is for printing.
virtual uchar *	operator[] (int y)
	Returns a pointer to the start of a scanline, or NULL if not available.
virtual void	GetOrigin (int &x, int &y)
	Gets the surface origin.
virtual void	SetOrigin (int x, int y)
	Sets the surface origin.
Friends
class	GFilter
class	GSurface

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Detailed Description

Base class for a graphics content, a plane that graphics primitives can be drawn.

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Member Function Documentation

COLOUR GDeviceContext::Colour (  COLOUR  c, int  Bits = 0 )  [virtual]

Sets the current colour. Parameters: c  The new colour Bits  The bit depth of the new colour or 0 to indicate the depth is the same as the current Surface Reimplemented in GScreenDC.

int GDeviceContext::Op (  int  Op  )  [virtual]

Sets the current blending mode in operation See also: GDC_SET, GDC_AND, GDC_OR, GDC_XOR and GDC_ALPHA Reimplemented in GScreenDC.

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The documentation for this class was generated from the following files:

• Gdc2.h
• linux/X/Gdc2.cpp
• linux/Y/Gdc2.cpp
• mac/Gdc2/Gdc2.cpp
• win32/Gdc2/Gdc2.cpp

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