Displayer Class Reference

#include "stage/output/displayer.hpp"

Description

A Displayer is a class which is responsible for rendering an image in some way (ie: Xvideo, GDK, OpenGL etc).

Remarks

All Displayer classes must extend the Displayer class and minimally rewrite:

• usable() - to indicate if the object can be used,
• format() - to indicate what type of input the put method expects
• put( void * ) - deal with an image of the expected type and size

By default, all images will be delivered to the put method in a resolution of IMG_WIDTH * IMG_HEIGHT. If another size is required, then the rewrite the methods:

• preferredWidth
• preferredHeight

If the widget being written to doesn't need a fixed size, then rewrite the two other put methods as required.

Definition at line 74 of file displayer.hpp.

Public Member Functions
virtual DisplayerInput	format ()
	Indicates the format required by the abstract put method. More...
virtual int	preferredHeight ()
	Expected height of input to put. More...
virtual int	preferredWidth ()
	Expected width of input to put. More...
virtual void	put (void *const)=0
	Put an image of a given width and height with the expected input format (as indicated by the format method).
virtual bool	usable ()
	Indicates if this object can be used to render images on the running system. More...

Static Protected Member Functions
static void	calculateVideoLayout (int widget_width, int widget_height, int image_width, int image_height, int &video_x, int &video_y, int &video_width, int &video_height)
	Calculates the coordinates for placing a video image inside a widget. More...

Protected Attributes
int	imageHeight
int	imageWidth

Member Function Documentation

usable()

bool usable ( )

virtual

Indicates if this object can be used to render images on the running system.

Reimplemented in XvDisplayer, and GdkDisplayer.

Definition at line 47 of file displayer.cpp.

format()

DisplayerInput format ( )

virtual

Indicates the format required by the abstract put method.

Definition at line 53 of file displayer.cpp.

preferredWidth()

int preferredWidth ( )

virtual

Expected width of input to put.

Definition at line 59 of file displayer.cpp.

Referenced by GdkDisplayer::put().

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preferredHeight()

int preferredHeight ( )

virtual

Expected height of input to put.

Definition at line 65 of file displayer.cpp.

Referenced by GdkDisplayer::put().

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calculateVideoLayout()

void calculateVideoLayout ( int  widget_width, int  widget_height, int  image_width, int  image_height, int &  video_x, int &  video_y, int &  video_width, int &  video_height  )

staticprotected

Calculates the coordinates for placing a video image inside a widget.

Parameters

[in]	widget_width	The width of the display widget.
[in]	widget_height	The height of the display widget.
[in]	image_width	The width of the video image.
[in]	image_height	The height of the video image.
[out]	video_x	The x-coordinate of the top left corner of the scaled video image.
[out]	video_y	The y-coordinate of the top left corner of the scaled video image.
[out]	video_width	The width of the scale video image.
[out]	video_height	The height of the scale video image.

Definition at line 71 of file displayer.cpp.

Referenced by GdkDisplayer::put().

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Inheritance diagram for Displayer:

Collaboration diagram for Displayer:

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

• displayer.hpp
• displayer.cpp