Struct GraphicsManager 

pub struct GraphicsManager {
    framebuffers: Mutex<Option<HashMap<String, Arc<FramebufferResource>>>>,
    display_configs: Mutex<Vec<DisplayConfiguration>>,
    active_mappings: Mutex<Vec<MmapRegion>>,
}

Graphics Manager - singleton for managing graphics resources

Fields

framebuffers: Mutex<Option<HashMap<String, Arc<FramebufferResource>>>>

Framebuffer resources mapped by logical name

display_configs: Mutex<Vec<DisplayConfiguration>>

Multi-display configuration (future use)

active_mappings: Mutex<Vec<MmapRegion>>

Active mmap regions (future use)

Implementations

impl GraphicsManager

pub const fn new() -> Self

Create a new GraphicsManager instance

pub fn get_manager() -> &'static GraphicsManager

Get reference to the global GraphicsManager instance

pub fn discover_graphics_devices(&self)

Discover and register graphics devices from DeviceManager

This method scans all devices in the DeviceManager for graphics devices and extracts their framebuffer resources for management.

pub fn register_framebuffer_from_device( &self, device_id: usize, device: SharedDevice, ) -> Result<(), &'static str>

Register a framebuffer resource from a specific graphics device

Arguments

• device_name - The name of the device in DeviceManager
• device - The shared device reference

Returns

Result indicating success or failure

pub fn get_framebuffer(&self, fb_name: &str) -> Option<Arc<FramebufferResource>>

Get a framebuffer resource by logical name

Arguments

• fb_name - The logical name of the framebuffer (e.g., “fb0”)

Returns

Optional reference to the framebuffer resource

pub fn get_framebuffer_names(&self) -> Vec<String>

Get all registered framebuffer names

Returns

Vector of logical framebuffer names

pub fn get_framebuffer_count(&self) -> usize

Get number of registered framebuffers

Returns

Number of registered framebuffers

pub fn create_framebuffer_char_device( &self, fb_name: &str, ) -> Result<(), &'static str>

Create a FramebufferCharDevice and register it with DeviceManager

Arguments

• fb_name - The logical name of the framebuffer (e.g., “fb0”)

Returns

Result indicating success or failure

pub fn set_char_device_id( &self, fb_name: &str, char_device_id: usize, ) -> Result<(), &'static str>

Update the character device ID for a framebuffer resource

Arguments

• fb_name - The logical name of the framebuffer
• char_device_id - The character device ID from DeviceManager

Returns

Result indicating success or failure

pub fn read_byte_from_framebuffer( &self, fb_name: &str, position: usize, ) -> Option<u8>

Read a single byte from the specified framebuffer

Arguments

• fb_name - The logical name of the framebuffer
• position - The position to read from

Returns

The byte at the specified position, or None if invalid

pub fn write_byte_to_framebuffer( &self, fb_name: &str, position: usize, byte: u8, ) -> Result<(), &'static str>

Write a single byte to the specified framebuffer

Arguments

• fb_name - The logical name of the framebuffer
• position - The position to write to
• byte - The byte to write

Returns

Result indicating success or failure

pub fn read_framebuffer( &self, fb_name: &str, position: usize, buffer: &mut [u8], ) -> usize

Read multiple bytes from the specified framebuffer

Arguments

• fb_name - The logical name of the framebuffer
• position - The starting position to read from
• buffer - The buffer to read data into

Returns

The number of bytes actually read

pub fn write_framebuffer( &self, fb_name: &str, position: usize, buffer: &[u8], ) -> Result<usize, &'static str>

Write multiple bytes to the specified framebuffer

Arguments

• fb_name - The logical name of the framebuffer
• position - The starting position to write to
• buffer - The buffer containing data to write

Returns

Result containing the number of bytes written or an error