+++ /dev/null
-;-----------------------------------------------------------\r
-;\r
-; MXPI.ASM - Stretch image\r
-; Copyright (c) 1994 by Alessandro Scotti\r
-;\r
-;-----------------------------------------------------------\r
-WARN PRO\r
-NOWARN RES\r
-INCLUDE MODEX.DEF\r
-\r
-PUBLIC mxStretchImage\r
-\r
-EXTRN subClipBox : NEAR\r
-\r
-MX_TEXT SEGMENT USE16 PARA PUBLIC 'CODE'\r
- ASSUME cs:MX_TEXT, ds:NOTHING, es:NOTHING\r
-\r
-EXTRN mx_VideoSegment : WORD\r
-EXTRN mx_BytesPerLine : WORD\r
-\r
-mxTable LABEL WORD ; Raster ops\r
- DW subMove\r
- DW subAnd\r
- DW subOr\r
- DW subXor\r
- DW subTrans\r
- DW subAdd\r
-\r
-;-----------------------------------------------------------\r
-;\r
-; Stretches and copies a "raw" image from memory to screen.\r
-;\r
-; Input:\r
-; Image = pointer to image\r
-; X, Y = coordinates of destination\r
-; Width = width of image in pixels\r
-; Height = height of image in pixels\r
-; NewWidth = new width of image in pixels\r
-; NewHeight = new height of image in pixels\r
-; Op = raster op (OP_xxx)\r
-; Output:\r
-; none\r
-;\r
-mxStretchImage PROC FAR\r
- ARG Op:WORD, \\r
- NewHeight:WORD, \\r
- NewWidth:WORD, \\r
- Height:WORD, \\r
- Width:WORD, \\r
- Y:WORD, \\r
- X:WORD, \\r
- Image:DWORD = ARG_SIZE\r
- LOCAL PixelOffset:WORD, \\r
- MoveFunction:WORD, \\r
- ReadPlane:BYTE, \\r
- OpInfo:BYTE, \\r
- WidthStep:DWORD, \\r
- HeightStep:DWORD, \\r
- ImageLo:WORD, \\r
- WritePlane:BYTE = AUTO_SIZE\r
- ASSUME ds:NOTHING\r
- .enter AUTO_SIZE\r
- .push ds, si, es, di\r
-\r
-; Get width stretch factor\r
- IF USE386 EQ TRUE\r
- movzx edx, [Width]\r
- xor eax, eax\r
- movzx ebx, [NewWidth]\r
- shl ebx, 16\r
- idiv ebx\r
- mov [WidthStep], eax\r
- ELSE\r
- xor dx, dx ; Width stretch factor\r
- mov ax, [Width]\r
- mov bx, [NewWidth]\r
- div bx\r
- mov WORD PTR WidthStep[2], ax\r
- xor ax, ax\r
- div bx\r
- mov WORD PTR WidthStep[0], ax\r
- ENDIF\r
-; Get height stretch factor\r
- IF USE386 EQ TRUE\r
- movzx edx, [Height]\r
- xor eax, eax\r
- movzx ebx, [NewHeight]\r
- shl ebx, 16\r
- idiv ebx\r
- mov [HeightStep], eax\r
- ELSE\r
- xor dx, dx\r
- mov ax, [Height]\r
- mov bx, [NewHeight]\r
- div bx\r
- mov WORD PTR HeightStep[2], ax\r
- xor ax, ax\r
- div bx\r
- mov WORD PTR HeightStep[0], ax\r
- ENDIF\r
-\r
-; Clip image\r
- mov bx, [X]\r
- mov ax, [Y]\r
- mov cx, [NewWidth]\r
- mov dx, [NewHeight]\r
- call subClipBox\r
- jc @@Exit ; Full clipped\r
- mov [NewWidth], cx\r
- mov [NewHeight], dx\r
- sub [X], bx\r
- sub [Y], ax\r
-\r
-; Get pixel address\r
- mul [mx_BytesPerLine]\r
- mov di, bx\r
- shr di, 1\r
- shr di, 1\r
- add di, ax\r
- mov [PixelOffset], di\r
- mov es, [mx_VideoSegment] ; ES:DI points to pixel\r
- and bl, 03h\r
- mov [ReadPlane], bl ; Set read plane\r
- mov cl, bl\r
- mov al, 00010001b\r
- shl al, cl\r
- mov [WritePlane], al ; Set write plane\r
-\r
-; Relocate image origin if previously clipped\r
- mov ax, [Y]\r
- test ax, ax\r
- jz @@OriginYDone\r
- IF USE386 EQ TRUE\r
- shl eax, 16\r
- imul [HeightStep]\r
- mov ax, [Width]\r
- mul dx\r
- ELSE\r
- mov bx, ax\r
- mul WORD PTR HeightStep[0]\r
- mov cx, dx\r
- mov ax, bx\r
- mul WORD PTR HeightStep[2]\r
- add ax, cx\r
- mul [Width]\r
- ENDIF\r
- add WORD PTR [Image], ax\r
-@@OriginYDone:\r
- mov ax, [X]\r
- test ax, ax\r
- jz @@OriginXDone\r
- IF USE386 EQ TRUE\r
- shl eax, 16\r
- imul [WidthStep]\r
- add WORD PTR [Image], dx\r
- ELSE\r
- mov bx, ax\r
- mul WORD PTR WidthStep[0]\r
- mov cx, dx\r
- mov ax, bx\r
- mul WORD PTR WidthStep[2]\r
- add ax, cx\r
- add WORD PTR [Image], ax\r
- ENDIF\r
-@@OriginXDone:\r
- mov ax, WORD PTR HeightStep[2]\r
- mul [Width]\r
- mov WORD PTR HeightStep[2], ax\r
-\r
-; Install move function\r
- mov bx, [Op]\r
- mov [OpInfo], bh ; Remember additional info if needed\r
- xor bh, bh\r
- cmp bl, OP_ADD\r
- jbe @@SetMoveFunction\r
- xor bl, bl\r
-@@SetMoveFunction:\r
- shl bx, 1\r
- mov ax, mxTable[bx]\r
- mov [MoveFunction], ax\r
-\r
-; Put image\r
- mov ds, WORD PTR Image[2]\r
- xor ax, ax\r
- mov [ImageLo], ax\r
-@@Loop:\r
- mov si, WORD PTR Image[0] ; Get pointer to image\r
- mov ah, [WritePlane]\r
- and ah, 0Fh\r
- mov al, 02h\r
- mov dx, TS\r
- out dx, ax ; Select write plane\r
- mov ah, [ReadPlane]\r
- and ah, 03h\r
- mov al, 04h\r
- mov dx, GDC\r
- out dx, ax ; Select read plane\r
- mov cx, [NewHeight]\r
- mov di, [PixelOffset] ; ES:DI points to video memory\r
- mov ah, [OpInfo] ; Additional raster op info\r
- xor bx, bx\r
- mov dx, [mx_BytesPerLine]\r
- call [MoveFunction] ; Draw column\r
- inc [ReadPlane] ; Next read plane\r
- rol [WritePlane], 1 ; Next write plane\r
- adc [PixelOffset], 0 ; Update video offset if needed\r
- mov dx, WORD PTR WidthStep[0]\r
- mov ax, WORD PTR WidthStep[2]\r
- add [ImageLo], dx\r
- adc WORD PTR Image[0], ax ; Next image column\r
- dec [NewWidth]\r
- jnz @@Loop ; Repeat for all columns\r
-\r
-@@Exit:\r
- xor ax, ax\r
- .pop ds, si, es, di\r
- .leave ARG_SIZE\r
-\r
-;-----------------------------------------------------------\r
-;\r
-; Move functions, on entry:\r
-; AH = additional raster op info (e.g. transparent color)\r
-; BX = 0,\r
-; CX = pixel count,\r
-; DX = mx_BytesPerLine.\r
-;\r
-subMove PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- mov es:[di], al\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subMove ENDP\r
-;\r
-subAnd PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- and es:[di], al\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subAnd ENDP\r
-;\r
-subOr PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- or es:[di], al\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subOr ENDP\r
-;\r
-subXor PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- xor es:[di], al\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subXor ENDP\r
-;\r
-subTrans PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- cmp al, ah\r
- je @@Skip\r
- mov es:[di], al\r
-@@Skip:\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subTrans ENDP\r
-;\r
-subAdd PROC NEAR\r
-@@Loop: mov al, ds:[si]\r
- add es:[di], al\r
- add di, dx\r
- dec cx\r
- jz @@Exit\r
- add si, WORD PTR HeightStep[2]\r
- add bx, WORD PTR HeightStep[0]\r
- jnc @@Loop\r
- add si, [Width]\r
- jmp @@Loop\r
-@@Exit: ret\r
-subAdd ENDP\r
-\r
-mxStretchImage ENDP\r
-\r
-MX_TEXT ENDS\r
-END\r
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