commit 7c4446f91d0419f7fc0ad1f0f861fa77ea10ee02
parent 0f43fa18fd10edabf459f6e62d29ac390e01863e
Author: Léo Villeveygoux <leo.villeveygoux@etu.u-bordeaux.fr>
Date: Fri, 21 Jul 2017 19:22:20 +0200
draw.asm: thickness aware point drawing function
Diffstat:
| M | draw.asm | | | 56 | +++++++++++++++++++++++++++++++++++++++++++++++++------- |
1 file changed, 49 insertions(+), 7 deletions(-)
diff --git a/draw.asm b/draw.asm
@@ -75,11 +75,7 @@ draw_loop:
and cl, al
jz .check_end
- ; get color
- mov ecx, 0
- mov cl, byte [selected]
- mov al, byte [palette + ecx]
- mov byte [pix+edx], al
+ call draw_point
.check_end:
@@ -168,6 +164,7 @@ inv_cross:
ret
inv_pix: ;pass coords in cl
+ mov eax, 0
mov al, byte [pix+ecx]
xor al, ~0
mov byte [pix+ecx], al
@@ -270,13 +267,58 @@ preprocess_input:
ret
-coords: dd 0x8080
-;pressing_x: db 0
+draw_point:
+ ; get topright corner
+ mov edx, [coords]
+ mov ecx, [radius]
+
+ sub dh, cl
+ inc dh
+ add dl, cl
+
+ ; cover the square surface
+ mov ecx, [radius]
+ sal ecx, 1
+ dec ecx
+ .x_loop:
+ push ecx
+ mov ecx, [radius]
+ sal ecx, 1
+ dec ecx
+
+ ; get to the left side
+ sub dl, cl
+ .y_loop
+ push ecx
+
+ ; get color & draw pixel
+ mov ecx, 0
+ mov eax, 0
+ mov cl, byte [selected]
+ mov al, byte [palette + ecx]
+ mov byte [pix+edx], al
+
+ pop ecx
+
+ ; go one pixel right
+ inc dl
+ loop .y_loop
+ pop ecx
+
+ ; go one pixel down
+ inc dh
+ loop .x_loop
+ ret
+
old_input: db 0
new_input: db 0
pressed_input: db 0
released_input: db 0
+coords: dd 0x8080
+
+radius: dd 0x2
+
selected: db 0
palette: db 0, 11b, 11111b, 11100b, 11111100b, 11100000b, 11100011b, ~0
palette_mask: db 7
