Synopsis #

Header: fxcg/display.h
Syscall index: 0x02AA
Function signature: void DirectDrawRectangle(int x1, int y1, int x2, int y2, unsigned short color)

Draws a rectangle to the display, bypassing VRAM. Allows for drawing in the frame area.

Parameters #

• x1 - horizontal coordinate of the top-left corner of the rectangle, 0 to 395.
• y1 - vertical coordinate of the top-left corner of the rectangle, 0 to 223.
• x2 - horizontal coordinate of the bottom-right corner of the rectangle, 0 to 395.
• y2 - vertical coordinate of the bottom-right corner of the rectangle, 0 to 223.
• color - fill color of the rectangle.

Comments #

This syscall appears to have a small bug/constraint: only rectangles where a certain (multiple of 2/4/8/16?) number of pixels needs to be drawn, will be drawn perfectly. Otherwise, there will be pixels missing at the bottom right.

If you only need to draw in the area accessible through the VRAM (i.e., not in the frame area), then using the VRAM will be preferable because it’s faster and doesn’t have the bugs/constraints this syscall has.