User:Johnburger/Demo/User/Frame

Drawing a frame is easy. I used the high OEM character set of the standard PC characters to draw the various corners and edges, and simply looped through the height and repeated widths.

The characters quoted below may not look like frame characters, but that's because they're in Unicode. The OEM equivalents come out just fine...

Demo/User/Frame.inc

;
; User/Frame.inc
;

; This function draws the frame using ASCII art and OEM characters
User.Frame:
                PUSH            ECX

                MOV             AH,User.FrameColour
                MOV             EBX,ECX         ; Save this away

                XOR             ECX,ECX         ; Zero high part of ECX

                MOV             EDX,EDI         ; Save this away
                MOV             AL,'Ú'          ; TopLeft corner
                STOSW                           ; Store on screen
                MOV             AL,'Ä'          ; Top
                MOV             CL,BL           ; This many
                REP             STOSW           ; Store on screen
                MOV             AL,'¿'          ; TopRight corner
                STOSW                           ; Store on screen

                LEA             EDI,[EDX+EBP]   ; Go to start of next row
                MOV             CL,BH           ; Height
                MOVZX           EBX,BL          ; Don't need BH any more
.Side:
                MOV             EDX,EDI         ; Save this away
                MOV             AL,'³'          ; Side
                STOSW                           ; Store on screen
                LEA             EDI,[EDI+EBX*2] ; Move to right side
                STOSW                           ; Store on screen

                LEA             EDI,[EDX+EBP]   ; Go to start of next row
                LOOP            .Side

;               MOV             EDX,EDI         ; Save this away
                MOV             AL,'À'          ; Bottom left
                STOSW                           ; Store on screen
                MOV             AL,'Ä'          ; Bottom
                MOV             CL,BL           ; This many
                REP             STOSW           ; Store on screen
                MOV             AL,'Ù'          ; Bottom right
                STOSW                           ; Store on screen
;               LEA             EDI,[EDX+EBP]   ; (Last row anyway)

                POP             ECX
                RET