[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for managing display context. |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; DisplayContext_Initialize |
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| 9 | ; Parameters: |
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| 10 | ; DS: BDA segment (zero) |
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| 11 | ; Returns: |
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| 12 | ; Nothing |
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| 13 | ; Corrupts registers: |
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| 14 | ; AX, DX, DI |
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| 15 | ;-------------------------------------------------------------------- |
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[369] | 16 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 17 | DisplayContext_Initialize: |
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| 18 | mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT |
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[44] | 19 | mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE |
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[287] | 20 | mov ax, [VIDEO_BDA.wCursorShape] |
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| 21 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax |
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[101] | 22 | ; Fall to .DetectAndSetDisplaySegment |
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[41] | 23 | |
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| 24 | ;-------------------------------------------------------------------- |
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| 25 | ; .DetectAndSetDisplaySegment |
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| 26 | ; Parameters: |
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| 27 | ; DS: BDA segment (zero) |
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| 28 | ; Returns: |
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| 29 | ; Nothing |
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| 30 | ; Corrupts registers: |
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[50] | 31 | ; AX, DX |
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[41] | 32 | ;-------------------------------------------------------------------- |
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| 33 | .DetectAndSetDisplaySegment: |
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[50] | 34 | mov ax, COLOR_TEXT_SEGMENT |
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[41] | 35 | cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE |
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[101] | 36 | eCMOVE ah, MONO_TEXT_SEGMENT >> 8 |
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[50] | 37 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax |
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[101] | 38 | ; Fall to .InitializeFlags |
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[50] | 39 | |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ; .InitializeFlags |
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| 42 | ; Parameters: |
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| 43 | ; DS: BDA segment (zero) |
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| 44 | ; Returns: |
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| 45 | ; Nothing |
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| 46 | ; Corrupts registers: |
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| 47 | ; AX, DX |
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| 48 | ;-------------------------------------------------------------------- |
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| 49 | .InitializeFlags: |
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| 50 | mov dl, FLG_CONTEXT_ATTRIBUTES |
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| 51 | call CgaSnow_IsCgaPresent |
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| 52 | jnc SHORT .DoNotSetCgaFlag |
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| 53 | or dl, FLG_CONTEXT_CGA |
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| 54 | .DoNotSetCgaFlag: |
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| 55 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl |
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[101] | 56 | ; Fall to .InitializeCursor |
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[41] | 57 | |
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[101] | 58 | ;-------------------------------------------------------------------- |
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| 59 | ; .InitializeCursor |
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| 60 | ; Parameters: |
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| 61 | ; DS: BDA segment (zero) |
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| 62 | ; Returns: |
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| 63 | ; Nothing |
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| 64 | ; Corrupts registers: |
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| 65 | ; AX, DX |
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| 66 | ;-------------------------------------------------------------------- |
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| 67 | .InitializeCursor: |
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[115] | 68 | call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init |
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| 69 | call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context |
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[101] | 70 | ; Fall to DisplayContext_SynchronizeToHardware |
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[41] | 71 | |
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| 72 | ;-------------------------------------------------------------------- |
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[101] | 73 | ; DisplayContext_SynchronizeToHardware |
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| 74 | ; Parameters: |
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| 75 | ; DS: BDA segment (zero) |
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| 76 | ; Returns: |
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| 77 | ; Nothing |
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| 78 | ; Corrupts registers: |
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| 79 | ; AX, DX |
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| 80 | ;-------------------------------------------------------------------- |
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[369] | 81 | ALIGN DISPLAY_JUMP_ALIGN |
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[101] | 82 | DisplayContext_SynchronizeToHardware: |
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| 83 | call DisplayPage_SynchronizeToHardware |
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| 84 | call DisplayCursor_SynchronizeShapeToHardware |
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| 85 | jmp DisplayCursor_SynchronizeCoordinatesToHardware |
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| 86 | |
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| 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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[41] | 89 | ; DisplayContext_Push |
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| 90 | ; Parameters: |
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| 91 | ; Nothing |
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| 92 | ; Returns: |
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| 93 | ; Nothing |
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| 94 | ; Corrupts registers: |
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| 95 | ; AX, DI |
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| 96 | ;-------------------------------------------------------------------- |
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[369] | 97 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 98 | DisplayContext_Push: |
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| 99 | mov di, ds ; Backup DS |
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| 100 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 101 | pop ax ; Pop return address |
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| 102 | |
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[194] | 103 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 104 | %assign i 0 |
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| 105 | %rep DISPLAY_CONTEXT_size / 2 |
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| 106 | push WORD [VIDEO_BDA.displayContext + i] |
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| 107 | %assign i i+2 |
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| 108 | %endrep |
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[194] | 109 | %endif |
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| 110 | |
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[41] | 111 | mov ds, di ; Restore DS |
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| 112 | jmp ax |
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| 113 | |
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| 114 | ;-------------------------------------------------------------------- |
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| 115 | ; DisplayContext_Pop |
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| 116 | ; Parameters: |
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| 117 | ; Nothing |
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| 118 | ; Returns: |
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| 119 | ; Nothing |
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| 120 | ; Corrupts registers: |
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| 121 | ; AX, DI |
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| 122 | ;-------------------------------------------------------------------- |
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[369] | 123 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 124 | DisplayContext_Pop: |
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| 125 | mov di, ds ; Backup DS |
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| 126 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 127 | pop ax ; Pop return address |
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| 128 | |
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[194] | 129 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 130 | %assign i DISPLAY_CONTEXT_size-2 |
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| 131 | %rep DISPLAY_CONTEXT_size / 2 |
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| 132 | pop WORD [VIDEO_BDA.displayContext + i] |
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| 133 | %assign i i-2 |
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| 134 | %endrep |
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[194] | 135 | %endif |
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| 136 | |
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[41] | 137 | push ax ; Push return address |
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| 138 | push dx |
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| 139 | call DisplayContext_SynchronizeToHardware |
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| 140 | pop dx |
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| 141 | mov ds, di ; Restore DS |
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| 142 | ret |
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| 143 | |
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| 144 | |
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| 145 | ;-------------------------------------------------------------------- |
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[52] | 146 | ; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX |
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[48] | 147 | ; Parameters: |
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[52] | 148 | ; CX: Off screen buffer length in characters |
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| 149 | ; ES:BX: Ptr to off screen buffer |
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[48] | 150 | ; Returns: |
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| 151 | ; Nothing |
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| 152 | ; Corrupts registers: |
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[52] | 153 | ; AX, DI |
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[48] | 154 | ;-------------------------------------------------------------------- |
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[133] | 155 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 156 | ALIGN DISPLAY_JUMP_ALIGN |
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[52] | 157 | DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX: |
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[48] | 158 | push ds |
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| 159 | |
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| 160 | LOAD_BDA_SEGMENT_TO ds, di |
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| 161 | xchg ax, bx |
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| 162 | mov bx, es |
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| 163 | call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer |
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| 164 | |
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| 165 | mov bl, ATTRIBUTES_NOT_USED |
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| 166 | mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY |
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| 167 | call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[52] | 168 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx |
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[48] | 169 | |
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| 170 | mov bx, di |
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| 171 | pop ds |
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| 172 | ret |
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[133] | 173 | %endif |
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[48] | 174 | |
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| 175 | |
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| 176 | ;-------------------------------------------------------------------- |
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[41] | 177 | ; DisplayContext_SetCharacterPointerFromBXAX |
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| 178 | ; Parameters: |
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| 179 | ; BX:AX: Ptr to destination for next character to output |
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| 180 | ; DS: BDA segment (zero) |
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| 181 | ; Returns: |
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[48] | 182 | ; ES:DI: Pointer that was in BX:AX |
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[41] | 183 | ; Corrupts registers: |
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| 184 | ; AX |
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| 185 | ;-------------------------------------------------------------------- |
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[133] | 186 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 187 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 188 | DisplayContext_SetCharacterPointerFromBXAX: |
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| 189 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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| 190 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx |
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| 191 | xchg di, ax |
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| 192 | mov es, bx |
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| 193 | ret |
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[133] | 194 | %endif |
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[41] | 195 | |
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| 196 | |
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| 197 | ;-------------------------------------------------------------------- |
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| 198 | ; DisplayContext_GetCharacterPointerToBXAX |
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| 199 | ; Parameters: |
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| 200 | ; DS: BDA segment (zero) |
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| 201 | ; Returns: |
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| 202 | ; BX:AX: Ptr to destination for next character to output |
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| 203 | ; Corrupts registers: |
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| 204 | ; Nothing |
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| 205 | ;-------------------------------------------------------------------- |
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[133] | 206 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 207 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 208 | DisplayContext_GetCharacterPointerToBXAX: |
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| 209 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 210 | mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2] |
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| 211 | ret |
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[133] | 212 | %endif |
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[41] | 213 | |
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| 214 | |
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| 215 | ;-------------------------------------------------------------------- |
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[45] | 216 | ; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[41] | 217 | ; Parameters: |
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| 218 | ; AX: Offset to character output function |
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[45] | 219 | ; BL: Attribute Flag |
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[41] | 220 | ; DS: BDA segment (zero) |
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| 221 | ; Returns: |
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| 222 | ; Nothing |
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| 223 | ; Corrupts registers: |
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[50] | 224 | ; BL |
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[41] | 225 | ;-------------------------------------------------------------------- |
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[369] | 226 | ALIGN DISPLAY_JUMP_ALIGN |
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[45] | 227 | DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL: |
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[50] | 228 | and bl, FLG_CONTEXT_ATTRIBUTES |
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| 229 | and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES |
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| 230 | or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl |
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[41] | 231 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax |
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| 232 | ret |
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[194] | 233 | |
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[41] | 234 | |
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| 235 | ;-------------------------------------------------------------------- |
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| 236 | ; DisplayContext_SetCharacterAttributeFromAL |
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| 237 | ; Parameters: |
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| 238 | ; AL: Character attribute |
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| 239 | ; DS: BDA segment (zero) |
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| 240 | ; Returns: |
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| 241 | ; Nothing |
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| 242 | ; Corrupts registers: |
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| 243 | ; Nothing |
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| 244 | ;-------------------------------------------------------------------- |
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[369] | 245 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 246 | DisplayContext_SetCharacterAttributeFromAL: |
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| 247 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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| 248 | ret |
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| 249 | |
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| 250 | |
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| 251 | ;-------------------------------------------------------------------- |
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| 252 | ; DisplayContext_SetCharacterOutputParameterFromAX |
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| 253 | ; Parameters: |
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| 254 | ; AX: Parameter for Character Output function |
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| 255 | ; DS: BDA segment (zero) |
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| 256 | ; Returns: |
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| 257 | ; Nothing |
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| 258 | ; Corrupts registers: |
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| 259 | ; Nothing |
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| 260 | ;-------------------------------------------------------------------- |
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[369] | 261 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 262 | DisplayContext_SetCharacterOutputParameterFromAX: |
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| 263 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax |
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| 264 | ret |
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| 265 | |
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[194] | 266 | |
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[41] | 267 | ;-------------------------------------------------------------------- |
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| 268 | ; DisplayContext_GetCharacterOutputParameterToDX |
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| 269 | ; Parameters: |
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| 270 | ; DS: BDA segment (zero) |
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| 271 | ; Returns: |
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| 272 | ; DX: User parameter for Character Output function |
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| 273 | ; Corrupts registers: |
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| 274 | ; Nothing |
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[133] | 275 | ;-------------------------------------------------------------------- |
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[181] | 276 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code) |
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[369] | 277 | ALIGN DISPLAY_JUMP_ALIGN |
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[181] | 278 | DisplayContext_GetCharacterOutputParameterToDX: |
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| 279 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam] |
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| 280 | ret |
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| 281 | %endif |
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[44] | 282 | |
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| 283 | |
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| 284 | ;-------------------------------------------------------------------- |
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| 285 | ; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 286 | ; Parameters: |
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| 287 | ; AX: Offset in bytes from some character to another |
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| 288 | ; DS: BDA segment (zero) |
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| 289 | ; Returns: |
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| 290 | ; AX: Offset in characters from some character to another |
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| 291 | ; Corrupts registers: |
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| 292 | ; Nothing |
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[133] | 293 | ;-------------------------------------------------------------------- |
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[201] | 294 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 295 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 296 | DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX: |
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| 297 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 298 | jz SHORT ReturnOffsetInAX |
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| 299 | sar ax, 1 ; BYTE count to WORD count |
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| 300 | ret |
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[194] | 301 | %endif |
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[44] | 302 | |
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[194] | 303 | |
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[44] | 304 | ;-------------------------------------------------------------------- |
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| 305 | ; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 306 | ; Parameters: |
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| 307 | ; AX: Offset in characters from some character to another |
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| 308 | ; DS: BDA segment (zero) |
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| 309 | ; Returns: |
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| 310 | ; AX: Offset in bytes from some character to another |
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| 311 | ; Corrupts registers: |
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| 312 | ; Nothing |
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[133] | 313 | ;-------------------------------------------------------------------- |
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[201] | 314 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 315 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 316 | DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX: |
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| 317 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 318 | jz SHORT ReturnOffsetInAX |
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| 319 | sal ax, 1 ; WORD count to BYTE count |
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[369] | 320 | ALIGN DISPLAY_JUMP_ALIGN, ret |
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[44] | 321 | ReturnOffsetInAX: |
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| 322 | ret |
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[194] | 323 | %endif |
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