The document analyzes the performance of single BLT (bit blit) operations for clearing blackness on images of varying heights from 100 to 600 pixels. It finds that the total time for BLT operations increases linearly with image height. On average, each BLT operation takes approximately 1.35 3D GPU clocks or 12.3 nanoseconds per pixel, with some variation depending on the image height.

1. Single BLT analysis (using 3D engine)
M1: Clear: Blackness BLT
Shereef Shehata

2. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 100 pixels
Total Time Linear fit: Intercept= 267.5754 us,
Slope = 1.3689 us/(100 pixels) = 13.7 ns/pixel = 1.507 3D GPU Clocks/pixel

3. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 100 pixels

4. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 100 pixels

5. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 200 pixels
Total Time Linear fit: Intercept= 288.0929 us,
Slope = 2.5136 us/(200 pixels) = 12.6 ns/pixel = 1.386 3D GPU Clocks/pixel

6. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 200 pixels

7. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 200 pixels

8. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 300 pixels
Total Time Linear fit: Intercept= 302.9406 us,
Slope = 3.6670 us/(300 pixels) = 12.2 ns/pixel = 1.342 3D GPU Clocks/pixel

9. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 300 pixels

10. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 300 pixels

11. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 400 pixels
Total Time Linear fit: Intercept= 319.5706 us,
Slope = 4.8350 us/(400 pixels) = 12.0876 ns/pixel = 1.329 3D GPU Clocks/pixel

12. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 400 pixels

13. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 400 pixels

14. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 500 pixels
Total Time Linear fit: Intercept= 357.2030 us,
Slope = 6.1406 us/(500 pixels) = 12.2811 ns/pixel = 1.35 3D GPU Clocks/pixel

15. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 500 pixels

16. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 500 pixels

17. M1: Clear Blackness BLT single BLT (Total Blitting Time us)
Fixed Image Height = 600 pixels
Total Time Linear fit: Intercept= 345.9043 us,
Slope = 7.3574 us/(600 pixels) = 12.2623 ns/pixel = 1.348 3D GPU Clocks / pixel

18. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Fixed Image Height = 600 pixels

19. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Fixed Image Height = 600 pixels

20. M1: Clear Blackness BLT single BLT (Per Pixel 3D GPU clocks)
Top View
Mean = 1.9685 3D GPU clock, Median = 1.6241, Std_Dev = 1.1241

21. M1: Clear Blackness BLT single BLT (Per Pixel Time in ns)
Top View
Mean = 17.8955 ns , Median = 14.7648ns, Std_Dev = 10.2189