| 445,6 → 445,14 |
|---|
| cdq ; extend eax sing to edx |
| shl eax, 16 ; using 16bit fix-point maths |
| idiv ebp ; eax = ((x2-x1)*65536)/(y2-y1) |
| ;-------------------------------------- |
| ; correction for the remainder of the division |
| shl edx, 1 |
| cmp ebp, edx |
| jb @f |
| inc eax |
| @@: |
| ;-------------------------------------- |
| mov edx, ebp ; edx = counter (number of pixels to draw) |
| mov ebp, 1 *65536; <<16 ; ebp = dy = 1.0 |
| mov esi, eax ; esi = dx |
| 466,6 → 474,14 |
|---|
| cdq ; extend eax sing to edx |
| shl eax, 16 ; using 16bit fix-point maths |
| idiv esi ; eax = ((y2-y1)*65536)/(x2-x1) |
| ;-------------------------------------- |
| ; correction for the remainder of the division |
| shl edx, 1 |
| cmp esi, edx |
| jb @f |
| inc eax |
| @@: |
| ;-------------------------------------- |
| mov edx, esi ; edx = counter (number of pixels to draw) |
| mov esi, 1 *65536;<< 16 ; esi = dx = 1.0 |
| mov ebp, eax ; ebp = dy |
| 474,10 → 490,25 |
|---|
| mov ebx, [dl_y1] |
| shl eax, 16 |
| shl ebx, 16 |
| ;----------------------------------------------------------------------------- |
| align 4 |
| .draw: |
| push eax ebx |
| ;-------------------------------------- |
| ; correction for the remainder of the division |
| test ah, 0x80 |
| jz @f |
| add eax, 1 shl 16 |
| @@: |
| ;-------------------------------------- |
| shr eax, 16 |
| ;-------------------------------------- |
| ; correction for the remainder of the division |
| test bh, 0x80 |
| jz @f |
| add ebx, 1 shl 16 |
| @@: |
| ;-------------------------------------- |
| shr ebx, 16 |
| call [putpixel] |
| pop ebx eax |