Drawing to the frame buffer. More...

#include <stdint.h>
#include "color.h"

Functions
int	hal_init (void)
	Initialize the frame buffer.

void	hal_putpixel (uint32_t x, uint32_t y, color_t color)
	Draw a pixel to the screen.

void	hal_fillrect (uint32_t x, uint32_t y, uint32_t w, uint32_t h, color_t color)
	Draw a rectangle to the screen.

uint64_t	hal_width (void)
	Get screen width.

uint64_t	hal_height (void)
	Get screen height.

Detailed Description

Drawing to the frame buffer.

The HAL (hardware abstraction layer) generally provides a way for other parts of the OS to interact with low-lever hardware functions without needing to know details specific to a particular platform.

In this case, the HAL provides a generatic way to draw pixels to the screen.

Function Documentation

◆ hal_fillrect()

void hal_fillrect	(	uint32_t	x,
		uint32_t	y,
		uint32_t	w,
		uint32_t	h,
		color_t	color
	)

Draw a rectangle to the screen.

Parameters

x	Pixels from left edge of screen to left edge of rectangle
y	Pixels from top edge of screen to top edge of rectangle
w	Width of rectangle in pixels
h	Height of rectangle in pixels
color	Color value to set all pixels within the rectangle to

◆ hal_height()

uint64_t hal_height ( void )

Get screen height.

Returns: Height of the screen in pixels

◆ hal_init()

int hal_init ( void )

Initialize the frame buffer.

This should be called before any other function in this header, otherwise the behavior is undefined.

Returns: 0 on success, non-zero on error

◆ hal_putpixel()

void hal_putpixel	(	uint32_t	x,
		uint32_t	y,
		color_t	color
	)

Draw a pixel to the screen.

Parameters

x	Pixels from left edge
y	Pixels from top edge
color	Color value to set the pixel to

◆ hal_width()

uint64_t hal_width ( void )

Get screen width.

Returns: Width of the screen in pixels