Lecture 1 (5)

Question 1

In a true colour framebuffer, how many bytes does each pixel take?

Answer 1

3 bytes (24 bits)

This allows for a total of 16,777,216 (~16 million) simultaneous colours.

Question 2

What is the total number of simultaneous colours in a true colour framebuffer?

Answer 2

16,777,216

This is calculated as 2^24.

Question 3

What is the address formula for pixel (2,1) in a true colour framebuffer given an image of height H and width W?

Answer 3

Address = 3(W+2)

This formula accounts for the pixel’s position in the framebuffer.

Question 4

What is the general address formula for pixel (x,y) in a true colour framebuffer?

Answer 4

Address = 3(x + Wy)

This formula calculates the address based on the pixel’s coordinates and the image width.

Question 5

What was the dominant display technology around the early 2000s?

Answer 5

CRT display

CRT stands for Cathode Ray Tube, which was widely used before the advent of LCD and LED technologies.

Question 6

In a true colour framebuffer, how are the pixel colours stored?

Answer 6

In BGR format 🤔

Each pixel’s colour is stored as three consecutive bytes representing Blue, Green, and Red.