| 1,236 → 1,4 |
|---|
| ;************************************************************************** |
| ;**********************DECODING BMP FILE(1,4,8,24 bits)********************* |
| ;*************************************************************************** |
| ; BMPTOIMG -Convert BMP format TO IMG format |
| ;*************************************************************************** |
| bmptoimg: |
| |
| mov [bmp_load_area],esi |
| mov [img_dest_area],edi |
| xor eax,eax |
| mov ax,word[esi+28] |
| mov ebx,[esi+14] |
| mov ecx,[esi+18] |
| mov edx,[esi+22] |
| mov [bmp_bits_per_pixel],ax |
| mov [bmp_first_structure_size],ebx |
| mov [Bmp_SizeY],edx |
| mov [Bmp_SizeX],ecx |
| |
| xor eax,eax |
| mov ax,[esi+28] |
| mul dword [esi+18] |
| add eax,31 |
| shr eax,5 |
| mov dword [bmptoimg_data_area_dwps],eax ;dwps-doublewords per string |
| shl eax,2 |
| mov dword [bmptoimg_data_area_bps],eax ;bps-bytes per string |
| |
| cmp dword [esi+34],0 |
| jne yespicsize ;if picture size is defined |
| mul dword [esi+22] |
| mov dword [esi+34],eax |
| |
| yespicsize: |
| |
| mov eax,[bmp_load_area] |
| add eax, [esi+10] ;how mach bytes to begin bitmap |
| add eax, [esi+34] ;size of bitmap in BMP file |
| mov dword [bmptoimg_data_area_eop],eax ;eop-end of picture in file |
| ;calculate bytes per string |
| mov eax, [esi+18] |
| lea eax,[eax+2*eax] ;3x pixels in eax |
| mov [bmp_bytes_per_string],eax |
| |
| mov esi,dword [bmptoimg_data_area_eop] |
| sub esi,dword [bmptoimg_data_area_bps] |
| |
| mov ebp,[img_dest_area] |
| mov edi,[img_dest_area] |
| mov ebx,[bmp_load_area] |
| add ebx, [bmp_first_structure_size] |
| add ebx,14 ;in ebx start of color table |
| |
| |
| cmp [bmp_bits_per_pixel],24 |
| je convert_to_24bpp |
| |
| cmp [bmp_bits_per_pixel],8 |
| je convert_to_8bpp |
| |
| cmp [bmp_bits_per_pixel],4 |
| je convert_to_4bpp |
| |
| cmp [bmp_bits_per_pixel],1 |
| je convert_to_1bpp |
| |
| jmp end_bmp |
| |
| ;-------------------------------------------------- |
| ;-----------Decoding 24 bit BMP file--------------- |
| ;-------------------------------------------------- |
| convert_to_24bpp: |
| |
| mov ebx,[Bmp_SizeY] |
| loop_convert_to_24bpp_y: |
| |
| mov edi,ebp |
| mov ecx,[bmptoimg_data_area_dwps] |
| |
| cld |
| rep movsd |
| |
| sub esi,[bmptoimg_data_area_bps] |
| sub esi,[bmptoimg_data_area_bps] |
| |
| add ebp,eax |
| dec ebx |
| jnz loop_convert_to_24bpp_y |
| |
| jmp end_bmp |
| ;----------------------------------------------------- |
| ;--------------Decoding 8 bits BMP file--------------- |
| ;----------------------------------------------------- |
| convert_to_8bpp: |
| |
| mov ebp,[Bmp_SizeY] |
| loop_convert_8bpp_y: |
| |
| mov ecx,[bmptoimg_data_area_bps] |
| push edi |
| |
| loop_convert_8bpp_x: |
| |
| xor eax,eax |
| mov al,byte [esi] |
| call converttable |
| inc esi |
| add edi,3 |
| |
| dec ecx |
| jnz loop_convert_8bpp_x |
| |
| pop edi |
| |
| add edi,[bmp_bytes_per_string] |
| sub esi,[bmptoimg_data_area_bps] |
| sub esi,[bmptoimg_data_area_bps] |
| |
| dec ebp |
| jnz loop_convert_8bpp_y |
| |
| jmp end_bmp |
| ;----------------------------------------------------- |
| ;--------------Decoding 4 bits BMP file--------------- |
| ;----------------------------------------------------- |
| convert_to_4bpp: |
| |
| mov ebp,[Bmp_SizeY] |
| loop_convert_4bpp_y: |
| |
| mov ecx,[bmptoimg_data_area_bps] |
| push edi |
| |
| loop_convert_4bpp_x: |
| |
| mov [Bmp_save1],ecx |
| xor eax,eax |
| mov al,byte [esi] |
| xor ecx,ecx |
| mov cl,al |
| shr al,4 ;first pixel in byte |
| and cl,0xf ;second pixel in byte |
| call converttable ;draw first pixel of byte |
| mov eax,ecx ;move second pixel to register al and draw |
| add edi,3 |
| call converttable ;draw second pixel of byte |
| add edi,3 |
| mov ecx,[Bmp_save1] |
| inc esi |
| |
| dec ecx |
| jnz loop_convert_4bpp_x |
| |
| pop edi |
| |
| add edi,[bmp_bytes_per_string] |
| sub esi,[bmptoimg_data_area_bps] |
| sub esi,[bmptoimg_data_area_bps] |
| |
| dec ebp |
| jnz loop_convert_4bpp_y |
| |
| jmp end_bmp |
| ;----------------------------------------------------- |
| ;---------------Decoding 1 bit BMP file--------------- |
| ;----------------------------------------------------- |
| convert_to_1bpp: |
| |
| mov ebp,[Bmp_SizeY] |
| loop_convert_1bpp_y: |
| |
| mov ecx,[bmptoimg_data_area_bps] |
| push edi |
| |
| loop_convert_1bpp_x: |
| |
| xor eax,eax |
| mov al,byte [esi] |
| mov [Bmp_save1],ecx |
| mov ecx,eax |
| mov edx,7 |
| nextbit: |
| xor eax,eax |
| bt ecx,edx |
| jnc noaddelem |
| inc eax |
| noaddelem: |
| |
| push edx |
| call converttable |
| pop edx |
| |
| add edi,3 |
| dec edx |
| jns nextbit |
| mov ecx,[Bmp_save1] |
| inc esi |
| dec ecx |
| jnz loop_convert_1bpp_x |
| |
| pop edi |
| |
| add edi,[bmp_bytes_per_string] |
| sub esi,[bmptoimg_data_area_bps] |
| sub esi,[bmptoimg_data_area_bps] |
| |
| dec ebp |
| jnz loop_convert_1bpp_y |
| |
| jmp end_bmp |
| ;----------------------------------------------------- |
| converttable: |
| shl eax,2 |
| add eax,ebx |
| mov edx, dword [eax] |
| mov [edi],edx |
| ret |
| ;----------------------------------------------------- |
| ; DATA AREA |
| bmptoimg_data_area_bps dd 0 |
| bmptoimg_data_area_dwps dd 0 |
| bmptoimg_data_area_eop dd 0 |
| bmp_load_area dd 0 |
| img_dest_area dd 0 |
| bmp_bits_per_pixel dw 0 |
| bmp_first_structure_size dd 0 |
| bmp_bytes_per_string dd 0 |
| |
| end_bmp: |
| |
| ret |
| |
| ;*************************************************************************** |
| ;*******************CODING BMP FILE(1,4,8,24 bits)************************** |
| ;*************************************************************************** |
| |