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Copy pathDGLBLITA.ASM
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DGLBLITA.ASM
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ideal
p386
p387
model flat
codeseg
locals
public lowlevel_blit_4_
public lowlevel_blit_4r_
public lowlevel_blit_r_
public lowlevel_blit_sprite_4_
public lowlevel_blit_sprite_4r_
public lowlevel_blit_sprite_r_
public lowlevel_blit_sprite_8_
public lowlevel_blit_sprite_8r_
; lowlevel_blit_4_
; eax = width4
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = dest_y_inc
; ebp+12 = src_y_inc
proc lowlevel_blit_4_ near
arg @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
mov ebx, [@@src_y_inc]
mov ebp, [@@dest_y_inc] ; WARNING: no stack/args access after this!
; eax = number of 4-pixel runs (dwords)
; edx = line loop counter
; ebx = src_y_inc
; ebp = dest_y_inc
test edx, edx ; make sure there is >0 lines to draw
jz @@done
@@draw_line:
mov ecx, eax ; draw all 4-pixel runs (dwords)
rep movsd
add esi, ebx ; move to next line
add edi, ebp
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 8
endp
; lowlevel_blit_4r_
; eax = width4
; edx = lines
; ebx = remainder
; ecx = dest
; ebp+8 = src
; ebp+12 = dest_y_inc
; ebp+16 = src_y_inc
proc lowlevel_blit_4r_ near
arg @@src:dword, @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ecx ; dest pixels
mov esi, [@@src] ; source pixels
; eax = number of 4-pixel runs (dwords)
; ebx = remaining number of pixels
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to draw
jz @@done
@@draw_line:
mov ecx, eax ; draw all 4-pixel runs (dwords)
rep movsd
mov ecx, ebx ; draw remaining pixels ( <= 3 bytes )
rep movsb
add esi, [@@src_y_inc] ; move to next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 12
endp
; lowlevel_blit_r_
; eax = width
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = dest_y_inc
; ebp+12 = src_y_inc
proc lowlevel_blit_r_ near
arg @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of pixels to draw (bytes)
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to draw
jz @@done
@@draw_line:
mov ecx, eax ; draw pixels (bytes)
rep movsb
add esi, [@@src_y_inc] ; move to next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 8
endp
; lowlevel_blit_sprite_4_
; eax = width4
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = dest_y_inc
; ebp+12 = src_y_inc
proc lowlevel_blit_sprite_4_ near
arg @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of 4-pixel runs (dwords)
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to be drawn
jz @@done
@@draw_line:
@@start_4_run:
mov ecx, eax ; ecx = counter of 4-pixel runs left to draw
@@draw_px_0:
mov bx, [esi+0] ; load src pixel
test bl, bl
jz @@draw_px_1 ; if it is color 0, skip it
mov [edi+0], bl ; otherwise, draw it onto dest
@@draw_px_1:
test bh, bh
jz @@draw_px_2
mov [edi+1], bh
@@draw_px_2:
mov bx, [esi+2]
test bl, bl
jz @@draw_px_3
mov [edi+2], bl
@@draw_px_3:
test bh, bh
jz @@end_4_run
mov [edi+3], bh
@@end_4_run:
add esi, 4 ; move src and dest up 4 pixels
add edi, 4
dec ecx ; decrease 4-pixel run loop counter
jnz @@draw_px_0 ; if there are still more runs, draw them
@@end_line:
add esi, [@@src_y_inc] ; move src and dest to start of next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 8
endp
; lowlevel_blit_sprite_4r_
; eax = width4
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = remainder
; ebp+12 = dest_y_inc
; ebp+16 = src_y_inc
proc lowlevel_blit_sprite_4r_ near
arg @@remainder:dword, @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of 4-pixel runs (dwords)
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to be drawn
jz @@done
@@draw_line:
@@start_4_run: ; draw 4-pixel runs first
mov ecx, eax ; ecx = counter of 4-pixel runs left to draw
@@draw_px_0:
mov bx, [esi+0] ; load src pixel
test bl, bl
jz @@draw_px_1 ; if it is color 0, skip it
mov [edi+0], bl ; otherwise, draw it onto dest
@@draw_px_1:
test bh, bh
jz @@draw_px_2
mov [edi+1], bh
@@draw_px_2:
mov bx, [esi+2]
test bl, bl
jz @@draw_px_3
mov [edi+2], bl
@@draw_px_3:
test bh, bh
jz @@end_4_run
mov [edi+3], bh
@@end_4_run:
add esi, 4 ; move src and dest up 4 pixels
add edi, 4
dec ecx ; decrease 4-pixel run loop counter
jnz @@draw_px_0 ; if there are still more runs, draw them
@@start_remainder_run: ; now draw remaining pixels ( <= 3 pixels )
mov ecx, [@@remainder] ; ecx = counter of remaining pixels
@@draw_pixel:
mov bl, [esi] ; load pixel
inc esi
test bl, bl ; if zero, skip to next pixel
jz @@end_pixel
mov [edi], bl ; else, draw pixel
@@end_pixel:
inc edi
dec ecx
jnz @@draw_pixel ; keep drawing pixels while there's still more
@@end_line:
add esi, [@@src_y_inc] ; move src and dest to start of next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 12
endp
; lowlevel_blit_sprite_r_
; eax = width
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = dest_y_inc
; ebp+12 = src_y_inc
proc lowlevel_blit_sprite_r_ near
arg @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of 4-pixel runs (dwords)
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to be drawn
jz @@done
@@draw_line:
mov ecx, eax ; ecx = counter of remaining pixels
@@draw_pixel:
mov bl, [esi] ; load pixel
inc esi
test bl, bl ; if zero, skip to next pixel
jz @@end_pixel
mov [edi], bl ; else, draw pixel
@@end_pixel:
inc edi
dec ecx
jnz @@draw_pixel ; loop while there's still pixels left
@@end_line:
add esi, [@@src_y_inc] ; move src and dest to start of next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 8
endp
; lowlevel_blit_sprite_8_
; eax = width8
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = dest_y_inc
; ebp+12 = src_y_inc
proc lowlevel_blit_sprite_8_ near
arg @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of 8-pixel runs
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to be drawn
jz @@done
@@draw_line:
mov ecx, eax ; ecx = counter of 8-pixel runs left to draw
@@draw_px_0:
mov bx, [esi+0] ; load src pixel
test bl, bl
jz @@draw_px_1 ; if it is color 0, skip it
mov [edi+0], bl ; otherwise, draw it onto dest
@@draw_px_1:
test bh, bh
jz @@draw_px_2
mov [edi+1], bh
@@draw_px_2:
mov bx, [esi+2]
test bl, bl
jz @@draw_px_3
mov [edi+2], bl
@@draw_px_3:
test bh, bh
jz @@draw_px_4
mov [edi+3], bh
@@draw_px_4:
mov bx, [esi+4]
test bl, bl
jz @@draw_px_5
mov [edi+4], bl
@@draw_px_5:
test bh, bh
jz @@draw_px_6
mov [edi+5], bh
@@draw_px_6:
mov bx, [esi+6]
test bl, bl
jz @@draw_px_7
mov [edi+6], bl
@@draw_px_7:
test bh, bh
jz @@end_8_run
mov [edi+7], bh
@@end_8_run:
add esi, 8 ; move src and dest up 8 pixels
add edi, 8
dec ecx ; decrease 8-pixel run loop counter
jnz @@draw_px_0 ; if there are still more runs, draw them
@@end_line:
add esi, [@@src_y_inc] ; move src and dest to start of next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 8
endp
; lowlevel_blit_sprite_8r_
; eax = width8
; edx = lines
; ebx = dest
; ecx = src
; ebp+8 = remainder
; ebp+12 = dest_y_inc
; ebp+16 = src_y_inc
proc lowlevel_blit_sprite_8r_ near
arg @@remainder:dword, @@dest_y_inc:dword, @@src_y_inc:dword
push ebp
mov ebp, esp
push edi
push esi
mov edi, ebx ; dest pixels
mov esi, ecx ; source pixels
; eax = number of 8-pixel runs
; edx = line loop counter
test edx, edx ; make sure there is >0 lines to be drawn
jz @@done
@@draw_line:
@@start_8_run: ; draw 8-pixel runs first
mov ecx, eax ; ecx = counter of 8-pixel runs left to draw
@@draw_px_0:
mov bx, [esi+0] ; load src pixel
test bl, bl
jz @@draw_px_1 ; if it is color 0, skip it
mov [edi+0], bl ; otherwise, draw it onto dest
@@draw_px_1:
test bh, bh
jz @@draw_px_2
mov [edi+1], bh
@@draw_px_2:
mov bx, [esi+2]
test bl, bl
jz @@draw_px_3
mov [edi+2], bl
@@draw_px_3:
test bh, bh
jz @@draw_px_4
mov [edi+3], bh
@@draw_px_4:
mov bx, [esi+4]
test bl, bl
jz @@draw_px_5
mov [edi+4], bl
@@draw_px_5:
test bh, bh
jz @@draw_px_6
mov [edi+5], bh
@@draw_px_6:
mov bx, [esi+6]
test bl, bl
jz @@draw_px_7
mov [edi+6], bl
@@draw_px_7:
test bh, bh
jz @@end_8_run
mov [edi+7], bh
@@end_8_run:
add esi, 8 ; move src and dest up 8 pixels
add edi, 8
dec ecx ; decrease 8-pixel run loop counter
jnz @@draw_px_0 ; if there are still more runs, draw them
@@start_remainder_run: ; now draw remaining pixels ( <= 7 pixels )
mov ecx, [@@remainder] ; ecx = counter of remaining pixels
@@draw_pixel:
mov bl, [esi] ; load pixel
inc esi
test bl, bl ; if zero, skip to next pixel
jz @@end_pixel
mov [edi], bl ; else, draw pixel
@@end_pixel:
inc edi
dec ecx
jnz @@draw_pixel ; loop while there's still pixels left
@@end_line:
add esi, [@@src_y_inc] ; move src and dest to start of next line
add edi, [@@dest_y_inc]
dec edx ; decrease line loop counter
jnz @@draw_line ; keep going if there's more lines to draw
@@done:
pop esi
pop edi
pop ebp
ret 12
endp
end