/
rect.asm
163 lines (144 loc) · 3.85 KB
/
rect.asm
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;===================================================================================================
; Rectangle
;
; Written By: Oded Cnaan (oded.8bit@gmail.com)
; Site: http://odedc.net
; Licence: GPLv3 (see LICENSE file)
; Package: GrLib
;
; Description:
; Draw rectangles
;===================================================================================================
LOCALS @@
;----------------------------------------------------------
; Draws a rectangle
;
; push x
; push y
; push width
; push height
; call GR_DrawRect
;----------------------------------------------------------
PROC GR_DrawRect
store_sp_bp
sub sp, 8 ; 2 bytes * 4 local vars
pusha
; now the stack is
; bp-8 => x2
; bp-6 => y2
; bp-4 => x1 - not in use
; bp-2 => y1 - not in use
; bp+0 => old base pointer
; bp+2 => return address
; bp+4 => param4 (height)
; bp+6 => param3 (width)
; bp+8 => param2 (y)
; bp+10 => param1 (x)
; saved registers
mov ax, [word bp+10]
add ax, [word bp+6] ; x + width
mov [bp-8], ax ; x2 = x + width
mov ax, [word bp+8]
add ax, [word bp+4] ; y + height
mov [word bp-6], ax ; y2 = y + height
push [word bp+10] ; x - Horz top
push [word bp+8] ; y
push [word bp-8] ; x2
push [word bp+8] ; y
call GR_DrawLine
push [word bp+10] ; x - Horz bottom
push [word bp-6] ; y2
push [word bp-8] ; x2
push [word bp-6] ; y2
call GR_DrawLine
push [word bp-8] ; x2 - Vert right
push [word bp+8] ; y
push [word bp-8] ; x2
push [word bp-6] ; y2
call GR_DrawLine
push [word bp+10] ; x - Vert left
push [word bp+8] ; y
push [word bp+10] ; x
push [word bp-6] ; y2
call GR_DrawLine
popa
restore_sp_bp
ret 8
ENDP GR_DrawRect
;+-+-+-+-+-+-+-+-+-+- RECTANGLE +-+-+-+-+-+-+-+-++-+-+-+-+-+
;----------------------------------------------------------
; Fills a rectangle
;
; push x
; push y
; push width
; push height
; call GR_FillRect
;----------------------------------------------------------
PROC GR_FillRect
store_sp_bp
sub sp, 8 ; 2 bytes * 4 local vars
pusha
; now the stack is
; bp-8 => x2
; bp-6 => y2
; bp-4 => x1
; bp-2 => y1
; bp+0 => old base pointer
; bp+2 => return address
; bp+4 => param4 (height)
; bp+6 => param3 (width)
; bp+8 => param2 (y)
; bp+10 => param1 (x)
; saved registers
mov ax, [bp+10]
add ax, [bp+6] ; x + width
mov [bp-8], ax ; x2 = x + width
mov ax, [bp+8]
add ax, [bp+4] ; y + height
mov [bp-6], ax ; y2 = y + height
@@GR_draw_rect__rect:
push [word bp+8]
pop [word bp-2]
@@GR_draw_rect__v:
push [word bp+10]
pop [word bp-4]
@@GR_draw_rect__h:
gr_set_pixel [bp-4], [bp-2], [gr_pen_color] ; draw pixel at (x1,y1)
inc [word bp-4] ; x1++
cmpv [bp-4], [bp-8], ax
jl @@GR_draw_rect__h ; if (x1 < x2) goto GR_draw_rect__h
inc [word bp-2] ; y2++
cmpv [bp-2], [bp-6], ax
jl @@GR_draw_rect__v ; if (y1 < y2) goto GR_draw_rect__v
popa
restore_sp_bp
ret 8
ENDP GR_FillRect
;////////////////////////////////////////////////////////////////////////////
; FUNCTION LIKE MACROS
;////////////////////////////////////////////////////////////////////////////
;----------------------------------------------------------------------
; Draw Rect
;
; grm_DrawRect (x, y, width, height)
;----------------------------------------------------------------------
MACRO grm_DrawRect x, y, width, height
push x
push y
push width
push height
call GR_DrawRect
ENDM
;----------------------------------------------------------------------
; Fill Rect
;
; grm_FillRect (x, y, width, height)
;----------------------------------------------------------------------
MACRO grm_FillRect x, y, width, height
push x
push y
push width
push height
call GR_FillRect
ENDM