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CEGUI::Font Class Referenceabstract

Class that encapsulates a typeface. More...

Inherits CEGUI::PropertySet, CEGUI::EventSet, and CEGUI::AllocatedObject< Font >.

Inherited by CEGUI::FreeTypeFont, and CEGUI::PixmapFont.

+ Collaboration diagram for CEGUI::Font:

Public Member Functions

virtual ~Font ()
 Destructor.
 
const StringgetName () const
 Return the string holding the font name.
 
const StringgetTypeName () const
 Return the type of the font.
 
const StringgetFileName () const
 Return the filename of the used font.
 
bool isCodepointAvailable (utf32 cp) const
 Return whether this Font can draw the specified code-point. More...
 
float drawText (GeometryBuffer &buffer, const String &text, const Vector2f &position, const Rectf *clip_rect, const ColourRect &colours, const float space_extra=0.0f, const float x_scale=1.0f, const float y_scale=1.0f) const
 Draw text into a specified area of the display. More...
 
void setNativeResolution (const Sizef &size)
 Set the native resolution for this Font. More...
 
const SizefgetNativeResolution () const
 Return the native display size for this Font. This is only relevant if the Font is being auto-scaled. More...
 
void setAutoScaled (const AutoScaledMode auto_scaled)
 Enable or disable auto-scaling for this Font. More...
 
AutoScaledMode getAutoScaled () const
 Checks whether this font is being auto-scaled and how. More...
 
virtual void notifyDisplaySizeChanged (const Sizef &size)
 Notify the Font that the display size may have changed. More...
 
float getLineSpacing (float y_scale=1.0f) const
 Return the pixel line spacing value for. More...
 
float getFontHeight (float y_scale=1.0f) const
 return the exact pixel height of the font. More...
 
float getBaseline (float y_scale=1.0f) const
 Return the number of pixels from the top of the highest glyph to the baseline. More...
 
float getTextExtent (const String &text, float x_scale=1.0f) const
 Return the pixel width of the specified text if rendered with this Font. More...
 
float getTextAdvance (const String &text, float x_scale=1.0f) const
 Return pixel advance of the specified text when rendered with this Font. More...
 
size_t getCharAtPixel (const String &text, float pixel, float x_scale=1.0f) const
 Return the index of the closest text character in String text that corresponds to pixel location pixel if the text were rendered. More...
 
size_t getCharAtPixel (const String &text, size_t start_char, float pixel, float x_scale=1.0f) const
 Return the index of the closest text character in String text, starting at character index start_char, that corresponds to pixel location pixel if the text were to be rendered. More...
 
void writeXMLToStream (XMLSerializer &xml_stream) const
 Writes an xml representation of this Font to out_stream. More...
 
const FontGlyphgetGlyphData (utf32 codepoint) const
 Return a pointer to the glyphDat struct for the given codepoint, or 0 if the codepoint does not have a glyph defined. More...
 
- Public Member Functions inherited from CEGUI::PropertySet
 PropertySet (void)
 Constructs a new PropertySet object.
 
virtual ~PropertySet (void)
 Destructor for PropertySet objects.
 
void addProperty (Property *property)
 Adds a new Property to the PropertySet. More...
 
void removeProperty (const String &name)
 Removes a Property from the PropertySet. More...
 
PropertygetPropertyInstance (const String &name) const
 Retrieves a property instance (that was previously added) More...
 
void clearProperties (void)
 Removes all Property objects from the PropertySet. More...
 
bool isPropertyPresent (const String &name) const
 Checks to see if a Property with the given name is in the PropertySet. More...
 
const StringgetPropertyHelp (const String &name) const
 Return the help text for the specified Property. More...
 
String getProperty (const String &name) const
 Gets the current value of the specified Property. More...
 
template<typename T >
PropertyHelper< T >::return_type getProperty (const String &name) const
 Gets the current value of the specified Property. More...
 
void setProperty (const String &name, const String &value)
 Sets the current value of a Property. More...
 
template<typename T >
void setProperty (const String &name, typename PropertyHelper< T >::pass_type value)
 Sets the current value of a Property. More...
 
bool isPropertyDefault (const String &name) const
 Returns whether a Property is at it's default value. More...
 
String getPropertyDefault (const String &name) const
 Returns the default value of a Property as a String. More...
 
PropertyIterator getPropertyIterator (void) const
 Return a PropertySet::PropertyIterator object to iterate over the available Properties.
 
- Public Member Functions inherited from CEGUI::EventSet
 EventSet ()
 Constructor for EventSet objects.
 
virtual ~EventSet (void)
 Destructor for EventSet objects.
 
void addEvent (const String &name)
 Creates a new Event object with the given name and adds it to the EventSet. More...
 
void addEvent (Event &event)
 Adds the given Event object to the EventSet. Ownership of the object passes to EventSet and it will be deleted when it is removed from the EventSet - whether explicitly via removeEvent or when the EventSet is destroyed. More...
 
void removeEvent (const String &name)
 Removes the Event with the given name. All connections to the event are disconnected, and the underlying Event object is destroyed. More...
 
void removeEvent (Event &event)
 Removes the given event from the EventSet. All connections to the event are disconnected, and the event object is destroyed. More...
 
void removeAllEvents (void)
 Remove all Event objects from the EventSet. Add connections will be disconnected, and all Event objects destroyed.
 
bool isEventPresent (const String &name)
 Checks to see if an Event with the given name is present in this EventSet. More...
 
virtual Event::Connection subscribeEvent (const String &name, Event::Subscriber subscriber)
 Subscribes a handler to the named Event. If the named Event is not yet present in the EventSet, it is created and added. More...
 
virtual Event::Connection subscribeEvent (const String &name, Event::Group group, Event::Subscriber subscriber)
 Subscribes a handler to the specified group of the named Event. If the named Event is not yet present in the EventSet, it is created and added. More...
 
template<typename Arg1 , typename Arg2 >
Event::Connection subscribeEvent (const String &name, Arg1 arg1, Arg2 arg2)
 Subscribes a handler to the named Event. If the named Event is not yet present in the EventSet, it is created and added. More...
 
template<typename Arg1 , typename Arg2 >
Event::Connection subscribeEvent (const String &name, Event::Group group, Arg1 arg1, Arg2 arg2)
 Subscribes a handler to the named Event. If the named Event is not yet present in the EventSet, it is created and added. More...
 
virtual Event::Connection subscribeScriptedEvent (const String &name, const String &subscriber_name)
 Subscribes the named Event to a scripted funtion. More...
 
virtual Event::Connection subscribeScriptedEvent (const String &name, Event::Group group, const String &subscriber_name)
 Subscribes the specified group of the named Event to a scripted funtion. More...
 
virtual void fireEvent (const String &name, EventArgs &args, const String &eventNamespace="")
 Fires the named event passing the given EventArgs object. More...
 
bool isMuted (void) const
 Return whether the EventSet is muted or not. More...
 
void setMutedState (bool setting)
 Set the mute state for this EventSet. More...
 
EventgetEventObject (const String &name, bool autoAdd=false)
 Return a pointer to the Event object with the given name, optionally adding such an Event object to the EventSet if it does not already exist. More...
 
EventIterator getEventIterator (void) const
 Return a EventSet::EventIterator object to iterate over the events currently added to the EventSet.
 

Static Public Member Functions

static void setDefaultResourceGroup (const String &resourceGroup)
 Sets the default resource group to be used when loading font data. More...
 
static const StringgetDefaultResourceGroup ()
 Returns the default resource group currently set for Fonts. More...
 

Static Public Attributes

static const argb_t DefaultColour
 Colour value used whenever a colour is not specified.
 
static const String EventNamespace
 Event namespace for font events.
 
static const String EventRenderSizeChanged
 

Protected Types

typedef std::map< utf32,
FontGlyph, std::less< utf32 >
CEGUI_MAP_ALLOC(utf32,
FontGlyph)> 
CodepointMap
 Definition of CodepointMap type.
 
- Protected Types inherited from CEGUI::EventSet
typedef std::map< String,
Event *, StringFastLessCompare
CEGUI_MAP_ALLOC(String, Event *)> 
EventMap
 

Protected Member Functions

 Font (const String &name, const String &type_name, const String &filename, const String &resource_group, const AutoScaledMode auto_scaled, const Sizef &native_res)
 Constructor.
 
virtual void rasterise (utf32 start_codepoint, utf32 end_codepoint) const
 This function prepares a certain range of glyphs to be ready for displaying. This means that after returning from this function glyphs from d_cp_map[start_codepoint] to d_cp_map[end_codepoint] should have their d_image member set. If there is an error during rasterisation of some glyph, it's okay to leave the d_image field set to NULL, in which case such glyphs will be skipped from display. More...
 
virtual void updateFont ()=0
 Update the font as needed, according to the current parameters.
 
virtual void writeXMLToStream_impl (XMLSerializer &xml_stream) const =0
 implementaion version of writeXMLToStream.
 
void addFontProperties ()
 Register all properties of this class.
 
virtual void onRenderSizeChanged (FontEventArgs &args)
 event trigger function for when the font rendering size changes.
 
void setMaxCodepoint (utf32 codepoint)
 Set the maximal glyph index. This reserves the respective number of bits in the d_glyphPageLoaded array.
 
virtual const FontGlyphfindFontGlyph (const utf32 codepoint) const
 finds FontGlyph in map and returns it, or 0 if none.
 
- Protected Member Functions inherited from CEGUI::EventSet
void fireEvent_impl (const String &name, EventArgs &args)
 Implementation event firing member.
 
ScriptModulegetScriptModule () const
 Helper to return the script module pointer or throw.
 
 EventSet (EventSet &)
 
EventSetoperator= (EventSet &)
 

Protected Attributes

String d_name
 Name of this font.
 
String d_type
 Type name string for this font (not used internally)
 
String d_filename
 Name of the file used to create this font (font file or imagset)
 
String d_resourceGroup
 Name of the font file's resource group.
 
float d_ascender
 maximal font ascender (pixels above the baseline)
 
float d_descender
 maximal font descender (negative pixels below the baseline)
 
float d_height
 (ascender - descender) + linegap
 
AutoScaledMode d_autoScaled
 which mode should we use for auto-scaling
 
Sizef d_nativeResolution
 native resolution for this Font.
 
float d_horzScaling
 current horizontal scaling factor.
 
float d_vertScaling
 current vertical scaling factor.
 
utf32 d_maxCodepoint
 Maximal codepoint for font glyphs.
 
uint * d_glyphPageLoaded
 This bitmap holds information about loaded 'pages' of glyphs. A glyph page is a set of 256 codepoints, starting at 256-multiples. For example, the 1st glyph page is 0-255, fourth is 1024-1279 etc. When a specific glyph is required for painting, the corresponding bit is checked to see if the respective page has been rasterised. If not, the rasterise() method is invoked, which prepares the glyphs from the respective glyph page for being painted. More...
 
CodepointMap d_cp_map
 Contains mappings from code points to Image objects.
 
- Protected Attributes inherited from CEGUI::EventSet
EventMap d_events
 
bool d_muted
 true if events for this EventSet have been muted.
 

Static Protected Attributes

static String d_defaultResourceGroup
 Holds default resource group for font loading.
 

Additional Inherited Members

- Public Types inherited from CEGUI::PropertySet
typedef ConstMapIterator
< PropertyRegistry > 
PropertyIterator
 
- Public Types inherited from CEGUI::EventSet
typedef ConstMapIterator
< EventMap > 
EventIterator
 

Detailed Description

Class that encapsulates a typeface.

A Font object is created for each unique typeface required. The Font class provides methods for loading typefaces from various sources, and then for outputting text via the Renderer object.

This class is not specific to any font renderer, it just provides the basic interfaces needed to manage fonts.

Member Function Documentation

float CEGUI::Font::drawText ( GeometryBuffer buffer,
const String text,
const Vector2f position,
const Rectf clip_rect,
const ColourRect colours,
const float  space_extra = 0.0f,
const float  x_scale = 1.0f,
const float  y_scale = 1.0f 
) const

Draw text into a specified area of the display.

Parameters
bufferGeometryBuffer object where the geometry for the text be queued.
textString object containing the text to be drawn.
positionReference to a Vector2 object describing the location at which the text is to be drawn.
clip_rectRect object describing the clipping area for the drawing. No drawing will occur outside this Rect.
coloursColourRect object describing the colours to be applied when drawing the text. NB: The colours specified in here are applied to each glyph, rather than the text as a whole.
space_extraNumber of additional pixels of spacing to be added to space characters.
x_scaleScaling factor to be applied to each glyph's x axis, where 1.0f is considered to be 'normal'.
y_scaleScaling factor to be applied to each glyph's y axis, where 1.0f is considered to be 'normal'.
Returns
The x co-ord where subsequent text should be rendered to ensure correct positioning (which is not possible to determine accurately by using the extent measurement functions).
AutoScaledMode CEGUI::Font::getAutoScaled ( ) const

Checks whether this font is being auto-scaled and how.

Returns
AutoScaledMode describing how this font should be auto scaled
float CEGUI::Font::getBaseline ( float  y_scale = 1.0f) const
inline

Return the number of pixels from the top of the highest glyph to the baseline.

Parameters
y_scaleScaling factor to be applied to the baseline distance, where 1.0f is considered to be 'normal'.
Returns
pixel spacing from top of front glyphs to baseline
size_t CEGUI::Font::getCharAtPixel ( const String text,
float  pixel,
float  x_scale = 1.0f 
) const
inline

Return the index of the closest text character in String text that corresponds to pixel location pixel if the text were rendered.

Parameters
textString object containing the text.
pixelSpecifies the (horizontal) pixel offset to return the character index for.
x_scaleScaling factor to be applied to each glyph's x axis when measuring the text extent, where 1.0f is considered to be 'normal'.
Returns
Returns a character index into String text for the character that would be rendered closest to horizontal pixel offset pixel if the text were to be rendered via this Font. Range of the return is from 0 to text.length(), so may actually return an index past the end of the string, which indicates pixel was beyond the last character.

References getCharAtPixel().

Referenced by getCharAtPixel().

size_t CEGUI::Font::getCharAtPixel ( const String text,
size_t  start_char,
float  pixel,
float  x_scale = 1.0f 
) const

Return the index of the closest text character in String text, starting at character index start_char, that corresponds to pixel location pixel if the text were to be rendered.

Parameters
textString object containing the text.
start_charindex of the first character to consider. This is the lowest value that will be returned from the call.
pixelSpecifies the (horizontal) pixel offset to return the character index for.
x_scaleScaling factor to be applied to each glyph's x axis when measuring the text extent, where 1.0f is considered to be 'normal'.
Returns
Returns a character index into String text for the character that would be rendered closest to horizontal pixel offset pixel if the text were to be rendered via this Font. Range of the return is from 0 to text.length(), so may actually return an index past the end of the string, which indicates pixel was beyond the last character.
static const String& CEGUI::Font::getDefaultResourceGroup ( )
inlinestatic

Returns the default resource group currently set for Fonts.

Returns
String describing the default resource group identifier that will be used when loading font data.
float CEGUI::Font::getFontHeight ( float  y_scale = 1.0f) const
inline

return the exact pixel height of the font.

Parameters
y_scaleScaling factor to be applied to the height, where 1.0f is considered to be 'normal'.
Returns
float value describing the pixel height of the font without any additional padding.
const FontGlyph* CEGUI::Font::getGlyphData ( utf32  codepoint) const

Return a pointer to the glyphDat struct for the given codepoint, or 0 if the codepoint does not have a glyph defined.

Parameters
codepointutf32 codepoint to return the glyphDat structure for.
Returns
Pointer to the glyphDat struct for codepoint, or 0 if no glyph is defined for codepoint.
float CEGUI::Font::getLineSpacing ( float  y_scale = 1.0f) const
inline

Return the pixel line spacing value for.

Parameters
y_scaleScaling factor to be applied to the line spacing, where 1.0f is considered to be 'normal'.
Returns
Number of pixels between vertical base lines, i.e. The minimum pixel space between two lines of text.
const Sizef& CEGUI::Font::getNativeResolution ( ) const

Return the native display size for this Font. This is only relevant if the Font is being auto-scaled.

Returns
Size object describing the native display size for this Font.
float CEGUI::Font::getTextAdvance ( const String text,
float  x_scale = 1.0f 
) const

Return pixel advance of the specified text when rendered with this Font.

Parameters
textString object containing the text to return the pixel advance for.
x_scaleScaling factor to be applied to each glyph's x axis when measuring the advance, where 1.0f is considered to be 'normal'.
Returns
pixel advance of text when rendered with this Font.
Note
The difference between the advance and the extent of a text string is important for numerous reasons. Picture some scenario where a glyph has a swash which extends way beyond the subsequent glyph - the text extent of those two glyphs is to the end of the swash on the first glyph whereas the advance of those two glyphs is to the start of a theoretical third glyph - still beneath the swash of the first glyph. The difference can basically be summarised as follows:
  • the extent is the total rendered width of all glyphs in the string.
  • the advance is the width to the point where the next character would have been drawn.
See Also
getTextExtent
float CEGUI::Font::getTextExtent ( const String text,
float  x_scale = 1.0f 
) const

Return the pixel width of the specified text if rendered with this Font.

Parameters
textString object containing the text to return the rendered pixel width for.
x_scaleScaling factor to be applied to each glyph's x axis when measuring the extent, where 1.0f is considered to be 'normal'.
Returns
Number of pixels that text will occupy when rendered with this Font.
Note
The difference between the advance and the extent of a text string is important for numerous reasons. Picture some scenario where a glyph has a swash which extends way beyond the subsequent glyph - the text extent of those two glyphs is to the end of the swash on the first glyph whereas the advance of those two glyphs is to the start of a theoretical third glyph - still beneath the swash of the first glyph. The difference can basically be summarised as follows:
  • the extent is the total rendered width of all glyphs in the string.
  • the advance is the width to the point where the next character would have been drawn.
See Also
getTextAdvance
bool CEGUI::Font::isCodepointAvailable ( utf32  cp) const
inline

Return whether this Font can draw the specified code-point.

Parameters
cputf32 code point that is the subject of the query.
Returns
true if the font contains a mapping for code point cp, false if it does not contain a mapping for cp.
virtual void CEGUI::Font::notifyDisplaySizeChanged ( const Sizef size)
virtual

Notify the Font that the display size may have changed.

Parameters
sizeSize object describing the display resolution
virtual void CEGUI::Font::rasterise ( utf32  start_codepoint,
utf32  end_codepoint 
) const
protectedvirtual

This function prepares a certain range of glyphs to be ready for displaying. This means that after returning from this function glyphs from d_cp_map[start_codepoint] to d_cp_map[end_codepoint] should have their d_image member set. If there is an error during rasterisation of some glyph, it's okay to leave the d_image field set to NULL, in which case such glyphs will be skipped from display.

Parameters
start_codepointThe lowest codepoint that should be rasterised
end_codepointThe highest codepoint that should be rasterised

Reimplemented in CEGUI::FreeTypeFont.

void CEGUI::Font::setAutoScaled ( const AutoScaledMode  auto_scaled)

Enable or disable auto-scaling for this Font.

Parameters
auto_scaledAutoScaledMode describing how this font should be auto scaled
See Also
AutoScaledMode
static void CEGUI::Font::setDefaultResourceGroup ( const String resourceGroup)
inlinestatic

Sets the default resource group to be used when loading font data.

Parameters
resourceGroupString describing the default resource group identifier to be used.
Returns
Nothing.
void CEGUI::Font::setNativeResolution ( const Sizef size)

Set the native resolution for this Font.

Parameters
sizeSize object describing the new native screen resolution for this Font.
void CEGUI::Font::writeXMLToStream ( XMLSerializer xml_stream) const

Writes an xml representation of this Font to out_stream.

Parameters
xml_streamStream where xml data should be output.
Returns
Nothing.

Member Data Documentation

uint* CEGUI::Font::d_glyphPageLoaded
protected

This bitmap holds information about loaded 'pages' of glyphs. A glyph page is a set of 256 codepoints, starting at 256-multiples. For example, the 1st glyph page is 0-255, fourth is 1024-1279 etc. When a specific glyph is required for painting, the corresponding bit is checked to see if the respective page has been rasterised. If not, the rasterise() method is invoked, which prepares the glyphs from the respective glyph page for being painted.

This array is big enough to hold at least max_codepoint bits. If this member is NULL, all glyphs are considered pre-rasterised.

const String CEGUI::Font::EventRenderSizeChanged
static

Event fired when the font internal state has changed such that the rendered size of they glyphs is different. Handlers are passed a const FontEventArgs reference with FontEventArgs::font set to the Font whose rendered size has changed.