FontManager

Class

Source: FontManager.h

Description

Static utility class for managing bitmap fonts.

FontManager provides functions to:

• Set and retrieve the default font
• Calculate text width for layout purposes
• Convert character codes to glyph indices

The default font is used when no font is explicitly specified in rendering calls.

Methods

static void setDefaultFont(const Font* font)

Description:

Sets the default font used for text rendering.

Parameters:

• font: Pointer to a Font structure. Must remain valid for the lifetime of its use. Pass nullptr to clear the default font (not recommended).

static const Font* getDefaultFont()

Description:

Gets the current default font.

Returns: Pointer to the default font, or nullptr if no font is set.

static int16_t textWidth(const Font* font, const char* text, uint8_t size = 1)

Description:

Calculates the width in pixels of a text string when rendered.

Parameters:

• font: Pointer to the font to use. If nullptr, uses the default font.
• text: The text string to measure.
• size: Text size multiplier (1 = normal, 2 = double size, etc.).

Returns: Width in pixels, or 0 if font is invalid or text is empty.

static uint8_t getGlyphIndex(char c, const Font* font = nullptr)

Description:

Gets the glyph index for a character code.

Parameters:

• c: The character code.
• font: Pointer to the font to use. If nullptr, uses the default font.

Returns: Glyph index (0-based) if character is in font range, or 255 if not found.

static bool isCharSupported(char c, const Font* font = nullptr)

Description:

Checks if a character is supported by a font.

Parameters:

• c: The character code.
• font: Pointer to the font to check. If nullptr, uses the default font.

Returns: true if the character is in the font's range, false otherwise.