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FreetypeFont Class Reference

This is a common base class for both DynamicTextFont and PNMTextMaker. Both of these are utility classes that use the FreeType library to generate glyphs from fonts; this class abstracts out that common wrapper around FreeType. More...

Inheritance diagram for FreetypeFont:
Namable MemoryBase DynamicTextFont PNMTextMaker

Public Member Functions

int getFontPixelSize ()
 This is used to report whether the requested pixel size is being only approximated by a fixed-pixel-size font. This returns 0 in the normal case, in which a scalable font is used, or the fixed-pixel-size font has exactly the requested pixel size. More...
 
float getLineHeight ()
 Returns the number of units high each line of text is. More...
 
bool getNativeAntialias ()
 Returns whether Freetype's built-in antialias mode is enabled. See set_native_antialias(). More...
 
float getPixelSize ()
 Returns the size of the font in pixels, as it appears in the texture. More...
 
float getPixelsPerUnit ()
 Returns the resolution of the texture map. See set_pixels_per_unit(). More...
 
float getPointSize ()
 Returns the point size of the font. More...
 
float getScaleFactor ()
 Returns the antialiasing scale factor. See set_scale_factor(). More...
 
float getSpaceAdvance ()
 Returns the number of units wide a space is. More...
 
 setNativeAntialias (bool native_antialias)
 Sets whether the Freetype library's built-in antialias mode is enabled. There are two unrelated ways to achieve antialiasing: with Freetype's native antialias mode, and with the use of a scale_factor greater than one. By default, both modes are enabled. More...
 
bool setPixelSize (float pixel_size)
 Computes the appropriate pixels_per_unit value to set the size of the font in the texture to the indicated number of pixels. This is just another way to specify pixels_per_unit(). More...
 
bool setPixelsPerUnit (float pixels_per_unit)
 Set the resolution of the texture map, and hence the clarity of the resulting font. This sets the number of pixels in the texture map that are used for each onscreen unit. More...
 
bool setPointSize (float point_size)
 Sets the point size of the font. This controls the apparent size of the font onscreen. By convention, a 10 point font is about 1 screen unit high. More...
 
bool setScaleFactor (float scale_factor)
 Sets the factor by which the font is rendered larger by the FreeType library before being filtered down to its actual size in the texture as specified by set_pixels_per_unit(). This may be set to a number larger than 1.0 to improve the font's antialiasing (since FreeType doesn't really do a swell job of antialiasing by itself). There is some performance implication for setting this different than 1.0. More...
 
- Public Member Functions inherited from Namable
 __init__ (const Namable copy)
 
 __init__ (str initial_name)
 
 clearName ()
 Resets the Namable's name to empty. More...
 
str getName ()
 
bool hasName ()
 Returns true if the Namable has a nonempty name set, false if the name is empty. More...
 
Namable operator= (const Namable other)
 
 output (Ostream out)
 Outputs the Namable. This function simply writes the name to the output stream; most Namable derivatives will probably redefine this. More...
 
 setName (str name)
 

Static Public Member Functions

static float getPointsPerInch ()
 Returns the number of points in one inch. This is a universal typographic convention. More...
 
static float getPointsPerUnit ()
 Returns the point size of the font that is one Panda unit high. This is an arbitrary Panda convention for text, and is set to 10.0. More...
 
- Static Public Member Functions inherited from Namable
static TypeHandle getClassType ()
 

Detailed Description

This is a common base class for both DynamicTextFont and PNMTextMaker. Both of these are utility classes that use the FreeType library to generate glyphs from fonts; this class abstracts out that common wrapper around FreeType.

Member Function Documentation

◆ getFontPixelSize()

int getFontPixelSize ( )

This is used to report whether the requested pixel size is being only approximated by a fixed-pixel-size font. This returns 0 in the normal case, in which a scalable font is used, or the fixed-pixel-size font has exactly the requested pixel size.

If this returns non-zero, it is the pixel size of the font that we are using to approximate our desired size.

◆ getLineHeight()

float getLineHeight ( )

Returns the number of units high each line of text is.

◆ getNativeAntialias()

bool getNativeAntialias ( )

Returns whether Freetype's built-in antialias mode is enabled. See set_native_antialias().

◆ getPixelSize()

float getPixelSize ( )

Returns the size of the font in pixels, as it appears in the texture.

◆ getPixelsPerUnit()

float getPixelsPerUnit ( )

Returns the resolution of the texture map. See set_pixels_per_unit().

◆ getPointSize()

float getPointSize ( )

Returns the point size of the font.

◆ getPointsPerInch()

static float getPointsPerInch ( )
static

Returns the number of points in one inch. This is a universal typographic convention.

◆ getPointsPerUnit()

static float getPointsPerUnit ( )
static

Returns the point size of the font that is one Panda unit high. This is an arbitrary Panda convention for text, and is set to 10.0.

◆ getScaleFactor()

float getScaleFactor ( )

Returns the antialiasing scale factor. See set_scale_factor().

◆ getSpaceAdvance()

float getSpaceAdvance ( )

Returns the number of units wide a space is.

◆ setNativeAntialias()

setNativeAntialias ( bool  native_antialias)

Sets whether the Freetype library's built-in antialias mode is enabled. There are two unrelated ways to achieve antialiasing: with Freetype's native antialias mode, and with the use of a scale_factor greater than one. By default, both modes are enabled.

At low resolutions, some fonts may do better with one mode or the other. In general, Freetype's native antialiasing will produce less blurry results, but may introduce more artifacts.

◆ setPixelSize()

bool setPixelSize ( float  pixel_size)

Computes the appropriate pixels_per_unit value to set the size of the font in the texture to the indicated number of pixels. This is just another way to specify pixels_per_unit().

◆ setPixelsPerUnit()

bool setPixelsPerUnit ( float  pixels_per_unit)

Set the resolution of the texture map, and hence the clarity of the resulting font. This sets the number of pixels in the texture map that are used for each onscreen unit.

Setting this number larger results in an easier to read font, but at the cost of more texture memory.

This should only be called before any characters have been requested out of the font, or immediately after calling clear().

◆ setPointSize()

bool setPointSize ( float  point_size)

Sets the point size of the font. This controls the apparent size of the font onscreen. By convention, a 10 point font is about 1 screen unit high.

This should only be called before any characters have been requested out of the font, or immediately after calling clear().

◆ setScaleFactor()

bool setScaleFactor ( float  scale_factor)

Sets the factor by which the font is rendered larger by the FreeType library before being filtered down to its actual size in the texture as specified by set_pixels_per_unit(). This may be set to a number larger than 1.0 to improve the font's antialiasing (since FreeType doesn't really do a swell job of antialiasing by itself). There is some performance implication for setting this different than 1.0.

This should only be called before any characters have been requested out of the font, or immediately after calling clear().