mirror of
https://github.com/kuhyx/WUT_Computer_Science.git
synced 2026-07-04 16:03:11 +02:00
137 lines
8.3 KiB
Plaintext
137 lines
8.3 KiB
Plaintext
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3 section .data
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4
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5
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6
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7 image_info_address EQU 8 ; First argument passed to our function starts from 8
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8 first_piece_address EQU 12 ; From that point we just add 4 to address of next
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9 ; arguments
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10 piece_to_swap_with_address EQU 16
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11 horizontal_divisons_address EQU 20
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12 piece_width_address EQU 24
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13 piece_height_address EQU 28
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14 piece_width_bytes_address EQU 32
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15 piece_height_bytes_address EQU 36
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16 bytes_per_row_address EQU 40
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17 firstPieceStartingByte EQU 44
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18 secondPieceStartingByte EQU 48
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19
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20
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21 pImg_inside_image_info_address EQU 12
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22
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23
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24 image_width EQU 0
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25 image_height EQU 4
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26 bytes_per_row_inside_image_info_address EQU 8
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27 image_pImg EQU 12
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28 image_pHeaderInfo EQU 16 ; not really used
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29
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30 ; first.X, first.Y, second.X, second.Y
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31
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32
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33
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34 %macro print 2 ;number of arguments this macro takes
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35 mov edx, %1 ;message length
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36 mov ecx, %2 ;message to write
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37 mov ebx,1 ;file descriptor (stdout)
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38 mov eax,4 ;system call number (sys_write)
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39 int 0x80 ;call kernel
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40 %endmacro
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41
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42
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43
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44 section .text
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45 global inner_loops ;must be declared for linker (ld)
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46 ; extern void hello_world(imageInfo* pInfo, int firstPiece, int pieceToSwapWith,
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47 ; int horizontalDivisions, int pieceWidth,
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48 ; int pieceHeight);
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49
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50 ; mov ecx, [ebp + 8] ; ecx <- address of imgInfo struct, not saved
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51 ; mov eax, [ebp + 12] ; eax <- firstPiece, not saved
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52 ; mov edx, [ebp + 16] ; edx <- pieceToSwapWith, not saved
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53 ; mov esi, [ecx + image_pImg] ; esi <- start of pixels in picture, saved
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54 ; mov ebx, [ebp + 20] ; ebx <- horizontalDivisions
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55 ; mov edi, [ebp + 24] ; edi <- pieceWidth
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56
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57 inner_loops: ;tells linker entry point
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58
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59 00000000 55 push ebp ; as per calling convention we need to keep the values of
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60 ; certain registers
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61 00000001 89E5 mov ebp,esp
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62 00000003 53 push ebx
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63 00000004 56 push esi
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64 00000005 57 push edi
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65
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66 ; what we use:
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67 ; ecx - firstPieceFirstByteAddress
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68 ; edx - secondPieceFirstByteAddress
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69 ; esi
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70 ; edi
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71
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72 ; what we have:
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73 ; eax
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74 ; ebx
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75
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76 00000006 53 push ebx
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77 00000007 50 push eax
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78 ;mov eax, [ebp + firstPieceStartingByte]
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79 ;mov eax, [eax + image_pImg]
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80 00000008 BF00000000 mov edi, 0
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81
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82 x_pixels_loop:
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83 0000000D 3B7D20 cmp edi, [ebp + piece_width_bytes_address]
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84 ;cmp edi, 300
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85 00000010 7D42 jge x_pixels_loop_end
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86 00000012 BE00000000 mov esi, 0
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87
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88 ; ecx = secondPieceStartingByte
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89 ; edx = firstPieceStartingByte
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90 ; we still have eax and ebx
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91 ;
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92 y_pixels_loop:
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93 00000017 3B7524 cmp esi, [ebp + piece_height_bytes_address]
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94 ;cmp esi, 96000
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95 0000001A 7D33 jge y_pixels_loop_end
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96 0000001C 8B4D30 mov ecx, [ebp + secondPieceStartingByte]
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97 0000001F 8B452C mov eax, [ebp + firstPieceStartingByte]
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98 00000022 01F9 add ecx, edi
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99 00000024 01F1 add ecx, esi
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100 00000026 01F8 add eax, edi
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101 00000028 01F0 add eax, esi
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102
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103 0000002A 8A18 mov BYTE bl, [eax]
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104 0000002C 8A11 mov BYTE dl, [ecx]
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105 0000002E 8819 mov BYTE[ecx], bl
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106 00000030 8810 mov BYTE[eax], dl
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107
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108 00000032 8A5801 mov BYTE bl, [eax + 1]
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109 00000035 8A5101 mov BYTE dl, [ecx + 1]
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110 00000038 885901 mov BYTE[ecx + 1], bl
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111 0000003B 885001 mov BYTE[eax + 1], dl
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112
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113 0000003E 8A5802 mov BYTE bl, [eax + 2]
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114 00000041 8A5102 mov BYTE dl, [ecx + 2]
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115 00000044 885902 mov BYTE[ecx + 2], bl
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116 00000047 885002 mov BYTE[eax + 2], dl
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117
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118
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119
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120 0000004A 037528 add esi, [ebp + bytes_per_row_address]
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121 0000004D EBC8 jmp y_pixels_loop
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122
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123
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124 ; for(x = 0; x < pieceWidth * 3; x += 3)
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125 y_pixels_loop_end:
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126 0000004F 83C703 add edi, 3
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127 00000052 EBB9 jmp x_pixels_loop
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128
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129 x_pixels_loop_end:
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130
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131 00000054 5E pop esi
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132 00000055 5F pop edi
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133 00000056 5B pop ebx
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134 00000057 89EC mov esp, ebp
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135 00000059 5D pop ebp
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136 0000005A C3 ret
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