Add a memory usage widget
This commit is contained in:
Juhani Krekelä
parent
68570ff2ad
commit
c6aa2ac3d1
2 changed files with 550 additions and 1 deletions
2
Makefile
2
Makefile
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@ -6,7 +6,7 @@ PYTHON = python3
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all: ponydos.img
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FS_FILES = shell.bin ponydos.wall passion.wall viewer.bin hello.bin ponydos.asm
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FS_FILES = shell.bin ponydos.wall passion.wall viewer.bin hello.bin memory.bin ponydos.asm
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ponydos.img: ponydos.bin $(FS_FILES)
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$(PYTHON) assemble_floppy.py $@ ponydos.bin $(FS_FILES)
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549
memory.asm
Normal file
549
memory.asm
Normal file
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@ -0,0 +1,549 @@
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%include "ponydos.inc"
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cpu 8086
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bits 16
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WINDOW_STATUS_NORMAL equ 0
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WINDOW_STATUS_MOVE equ 1
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; 0x0000
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jmp near process_event
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; 0x0003 PROC_INITIALIZE_ENTRYPOINT
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; initialize needs to preserve ds
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initialize:
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push ds
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; On entry, ds and es will not be set correctly for us
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mov bp, cs
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mov ds, bp
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mov es, bp
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call hook_self_onto_window_chain
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; We must explicitly request redraw from the compositor
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call request_redraw
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pop ds
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retf
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; process_event needs to preserve all registers other than ax
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; in:
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; al = event
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; bx = window ID
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; cx, dx = event-specific
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; out:
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; ax = event-specific
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process_event:
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push bx
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push cx
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push dx
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push si
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push di
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push bp
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push ds
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push es
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; On entry, ds and es will not be set correctly for us
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mov bp, cs
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mov ds, bp
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mov es, bp
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cmp al, WM_PAINT
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jne .not_paint
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call event_paint
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jmp .end
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.not_paint:
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cmp al, WM_MOUSE
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jne .not_mouse
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call event_mouse
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jmp .end
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.not_mouse:
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cmp al, WM_KEYBOARD
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jne .not_keyboard
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call event_keyboard
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jmp .end
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.not_keyboard:
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cmp al, WM_UNHOOK
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jne .not_unhook
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call event_unhook
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jmp .end
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.not_unhook:
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.end:
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pop es
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pop ds
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pop bp
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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retf
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; ------------------------------------------------------------------
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; Event handlers
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; ------------------------------------------------------------------
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; in:
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; al = WM_PAINT
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; bx = window ID
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; out:
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; clobbers everything
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event_paint:
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; Forward the paint event to the next window in the chain
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; We must do this before we paint ourselves, because painting must
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; happen from the back to the front
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; Because we only have one window, we don't need to save our own ID
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mov bx, [window_next]
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call send_event
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call update_usage_display
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mov bx, [window_width] ; Buffer width, usually same as window width
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mov cx, [window_width]
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mov dx, [window_height]
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mov si, window_data
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mov di, [window_x]
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mov bp, [window_y]
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cmp di, 0
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jge .not_clip_left
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.clip_left:
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; Adjust the start of buffer to point to the first cell
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; that is on screen
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sub si, di
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sub si, di
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; Adjust window width to account for non-rendered area
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; that is off screen
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add cx, di
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; Set X to 0
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xor di, di
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.not_clip_left:
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mov ax, di
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add ax, cx
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cmp ax, COLUMNS
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jle .not_clip_right
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.clip_right:
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; Adjust the width to only go as far as the right edge
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sub ax, COLUMNS
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sub cx, ax
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.not_clip_right:
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mov ax, bp
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add ax, dx
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cmp ax, ROWS
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jle .not_clip_bottom
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.clip_bottom:
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; Adjust the height to only go as far as the bottom edge
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sub ax, ROWS
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sub dx, ax
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.not_clip_bottom:
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call PONYDOS_SEG:SYS_DRAW_RECT
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ret
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; in:
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; al = WM_MOUSE
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; bx = window ID
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; cl = X
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; ch = Y
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; dl = mouse buttons held down
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; out:
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; clobbers everything
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event_mouse:
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test dl, MOUSE_PRIMARY | MOUSE_SECONDARY
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jnz .not_end_window_change
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; If we were moving the window, releasing the button signals the
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; end of the action
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mov byte [window_status], WINDOW_STATUS_NORMAL
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.not_end_window_change:
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; Expand X and Y to 16 bits for easier calculations
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; Because we only have one window, we don't need to save our own ID
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xor bx, bx
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mov bl, ch
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xor ch, ch
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; Are we moving the window at the moment?
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cmp byte [window_status], WINDOW_STATUS_MOVE
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jne .not_moving
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call move_window
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.not_moving:
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; Check if the mouse is outside our window
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cmp cx, [window_x]
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jl .outside ; x < window_x
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cmp bx, [window_y]
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jl .outside ; y < window_y
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mov ax, [window_x]
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add ax, [window_width]
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cmp ax, cx
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jle .outside ; window_x + window_width <= x
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mov ax, [window_y]
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add ax, [window_height]
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cmp ax, bx
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jle .outside ; window_y + window_height <= y
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.inside:
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cmp byte [window_mouse_released_inside], 0
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je .not_click
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test dl, MOUSE_PRIMARY | MOUSE_SECONDARY
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jz .not_click
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.click:
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call event_click
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.not_click:
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; We need to keep track of if the mouse has been inside our
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; window without the buttons held, in order to avoid
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; generating click events in cases where the cursor is
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; dragged into our window while buttons are held
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test dl, MOUSE_PRIMARY | MOUSE_SECONDARY
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jz .buttons_not_held
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.buttons_held:
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mov byte [window_mouse_released_inside], 0
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jmp .buttons_end
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.buttons_not_held:
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mov byte [window_mouse_released_inside], 1
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.buttons_end:
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; We must forward the event even if it was inside our
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; window, to make sure other windows know when the mouse
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; leaves them
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; Set x and y to 255 so that windows below ours don't think
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; the cursor is inside them
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; Also clear the mouse buttons – not absolutely necessary
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; but it's cleaner if other windows don't get any
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; information about the mouse
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mov al, WM_MOUSE
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mov bx, [window_next]
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mov cx, 0xffff
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xor dl, dl
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call send_event
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ret
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.outside:
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mov byte [window_mouse_released_inside], 0
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; Not our window, forward the event
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mov al, WM_MOUSE
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mov ch, bl ; Pack the X and Y back into cx
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mov bx, [window_next]
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call send_event
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ret
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ret
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; in:
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; bx = Y
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; cx = X
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; dl = mouse buttons
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event_click:
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push ax
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; This is not a true event passed into our event handler, but
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; rather one we've synthetized from the mouse event
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; The reason we synthetize this event is because most interface
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; elements react to clicks specifically, so having this event
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; making implementing them easier
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; Raising a window is done by first unhooking, then rehooking it to
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; the window chain
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call unhook_self_from_window_chain
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call hook_self_onto_window_chain
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call request_redraw
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; Did the user click the title bar?
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cmp [window_y], bx
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jne .not_title_bar
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.title_bar:
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; Did the user click the window close button?
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mov ax, [window_x]
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add ax, [window_width]
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dec ax
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cmp ax, cx
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jne .not_close
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.close:
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call unhook_self_from_window_chain
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; Nothing can call into us again after we unhook
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; the window, so deallocate the memory we have
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; reserved
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call deallocate_own_memory
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; We don't need to call request_redraw here, since
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; it will be called unconditionally above
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jmp .title_bar_end
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.not_close:
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; Clicking on the title bar signals beginning of a window
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; move
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mov byte [window_status], WINDOW_STATUS_MOVE
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mov ax, [window_x]
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sub ax, cx
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mov [window_move_x_offset], ax
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.title_bar_end:
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.not_title_bar:
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.end:
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pop ax
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ret
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; in:
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; al = WM_KEYBOARD
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; bx = window ID
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; cl = typed character
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; ch = pressed key
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; out:
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; clobbers everything
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event_keyboard:
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; Unlike other events, keyboard events are not forwarded
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; Since we do not care about the keyboard for this app, we just
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; swallow the event
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ret
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; in:
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; al = WM_UNHOOK
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; bx = window ID
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; cx = window ID of the window to unhook from the window chain
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; out:
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; ax = own window ID if we did not unhook
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; next window ID if we did
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; clobbers everything else
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event_unhook:
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cmp bx, cx
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je .unhook_self
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; Save our own ID
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push bx
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; Propagate the event
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mov bx, [window_next]
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call send_event
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; Update window_next in case the next one unhooked
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mov [window_next], ax
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; Return our own ID
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pop ax
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ret
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.unhook_self:
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; Return window_next to the caller, unhooking us from the
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; chain
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mov ax, [window_next]
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ret
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; ------------------------------------------------------------------
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; Event handler subroutines
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; ------------------------------------------------------------------
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; in:
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; bx = Y
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; cx = X
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move_window:
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push ax
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; Offset the X coördinate so that the apparent drag position
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; remains the same
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mov ax, cx
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add ax, [window_move_x_offset]
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; Only do an update if something has changed. Reduces flicker
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cmp [window_x], ax
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jne .update_location
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cmp [window_y], bx
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jne .update_location
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jmp .end
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.update_location:
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mov [window_x], ax
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mov [window_y], bx
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call request_redraw
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.end:
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pop ax
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ret
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update_usage_display:
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push ax
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push cx
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push si
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push di
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push ds
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mov cx, PONYDOS_SEG
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mov ds, cx
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mov si, GLOBAL_MEMORY_ALLOCATION_MAP
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mov di, window_data.indicators
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mov cx, MEM_ALLOCATION_MAP_SIZE
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.loop:
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lodsb
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test al, al
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jz .unused
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.used:
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mov al, 0xfe
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jmp .loop_bottom
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.unused:
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xor al, al
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.loop_bottom:
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stosb
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inc di
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loop .loop
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.end:
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pop ds
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pop di
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pop si
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pop cx
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pop ax
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ret
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; ------------------------------------------------------------------
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; Window chain
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; ------------------------------------------------------------------
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; in:
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; al = event
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; bx = window to send the event to
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; cx, dx = event-specific
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; out:
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; ax = event-specific, 0 if bx=0
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send_event:
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test bx, bx
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jnz .non_zero_id
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; Returning 0 if the window ID is 0 makes window unhooking simpler
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xor ax, ax
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ret
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.non_zero_id:
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push bp
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; Push the return address
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push cs
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mov bp, .end
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push bp
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; Push the address we're doing a far-call to
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mov bp, bx
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and bp, 0xf000 ; Highest nybble of window ID marks the segment
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push bp
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xor bp, bp ; Event handler is always at address 0
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push bp
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retf
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.end:
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pop bp
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ret
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hook_self_onto_window_chain:
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push ax
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push es
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mov ax, PONYDOS_SEG
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mov es, ax
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; Window ID is made of the segment (top nybble) and an arbitrary
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; process-specific part (lower three nybbles). Since we only have
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; one window, we can leave the process-specific part as zero
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mov ax, cs
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xchg [es:GLOBAL_WINDOW_CHAIN_HEAD], ax
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; Save the old head of the chain, so that we can propagate events
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; down to it
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mov [window_next], ax
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pop es
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pop ax
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ret
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unhook_self_from_window_chain:
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push bx
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push cx
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push es
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mov ax, PONYDOS_SEG
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mov es, ax
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mov al, WM_UNHOOK
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mov bx, [es:GLOBAL_WINDOW_CHAIN_HEAD]
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; Our window ID is just our segment, see the comment in
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; hook_self_onto_window_chain
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mov cx, cs
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call send_event
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; Update the head of the chain, in case we were at the head
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mov [es:GLOBAL_WINDOW_CHAIN_HEAD], ax
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pop es
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pop cx
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pop bx
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ret
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; ------------------------------------------------------------------
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; Memory management
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; ------------------------------------------------------------------
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deallocate_own_memory:
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push bx
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push cx
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push es
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mov bx, PONYDOS_SEG
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mov es, bx
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; Segment 0xn000 corresponds to slot n in the allocation table
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mov bx, cs
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mov cl, 12
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shr bx, cl
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mov byte [es:GLOBAL_MEMORY_ALLOCATION_MAP + bx], 0
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pop es
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pop cx
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pop bx
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ret
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; ------------------------------------------------------------------
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; Painting
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; ------------------------------------------------------------------
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request_redraw:
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push ax
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push es
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mov ax, PONYDOS_SEG
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mov es, ax
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mov byte [es:GLOBAL_REDRAW], 1
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pop es
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pop ax
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ret
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; ------------------------------------------------------------------
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; Variables
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; ------------------------------------------------------------------
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window_next dw 0xffff
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window_x dw 65
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window_y dw 3
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window_width dw 10
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window_height dw 3
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window_mouse_released_inside db 0
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window_status db WINDOW_STATUS_NORMAL
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window_move_x_offset dw 0
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window_data:
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db 'U', 0x0f, 's', 0x0f, 'a', 0x0f, 'g', 0x0f, 'e', 0x0f
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times 10-5-1 db 0x00, 0x0f
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db 'x', 0x0f
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db '0', 0xf0, '1', 0xf0, '2', 0xf0, '3', 0xf0, '4', 0xf0, '5'
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db 0xf0, '6', 0xf0, '7', 0xf0, '8', 0xf0, '9', 0xf0
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.indicators: times 10 db 0x00, 0xf0
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