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AX = 4F0Bh BL = subfunction 00h get length of device context buffer 01h initialize device context buffer ES:DI -> real-mode address of buffer (see #00089)
Return:
AL = 4Fh if function supported AH = status 00h successful CX = number of bytes required for buffer (if BL=00h on entry) ES:DI buffer initialized (if BL=01h on entry) 01h failed
Note: This interface description is derived from the draft VBE/AF proposal (version 1.0P, document revsion 0.12P, dated 13jan95)
See Also: AX=4F00h - AX=4F01h - AX=4F17h
Format of VBE/AF v1.0P Device Context buffer: Offset Size Description (Table 00089) 00h WORD maximum X coordinate in frame buffer (0 = left edge)
Note: Application must never pass X coordinate greater than this value to the SetClipRect function (values are NOT range-checked!) 02h WORD maximum Y coordinate in frame buffer (0 = top edge)
Note: Application must never pass Y coordinate greater than this value to the SetClipRect function 04h DWORD -> "SetForeColor" to set foreground color/mix (see #00091) 08h DWORD -> "SetBackColor" to set background color/mix (see #00092) 0Ch DWORD -> "SetClipRect" set hardware clipping rectangle (see #00093) 10h DWORD -> function "DrawScan" to draw a single scan line 14h DWORD -> function "DrawScanList" to draw a list of scan lines 18h DWORD -> function "DrawRect" to draw a solid rectangle 1Ch DWORD -> function "DrawLine" to draw a solid line 20h DWORD -> function "DrawPattScan" to draw a patterned scan line 24h DWORD -> function "BitBlt" to perform screen-to-screen BitBLT 28h DWORD -> "TransBitBlt" to perform transparent screen-to-screen BitBLT 2Ch DWORD -> "MonoBitBlt" to monochrome expansion screen-to-screen BitBLT 30h DWORD -> function "SetCursor" to download hardware cursor image 34h DWORD -> function "SetCursorPos" to set hardware cursor position 38h DWORD -> function "SetCursorColor" to set hardware cursor color 3Ch DWORD -> function "ShowCursor" to show/hide hardware cursor 40h DWORD -> function "WaitTillIdle" to wait until graphics engine idle 44h DWORD -> "EnableDirectAccess" to enable direct framebuffer access 48h DWORD -> "DisableDirectAccess" to disable direct framebuffer access 4Ch DWORD -> "BankSwitchCB" bank-switching callback function (set by application, may simply point at 32-bit VBE 2.0 bank switching entry point) 50h WORD "VidMemSel" selector for video memory (must be set by app) 52h WORD "IOPortsOff" offset of I/O ports table in context buffer 54h WORD "IOMemoryOff" offset of I/O memory table in context buffer 56h WORD "IOMemSel1" selector for first I/O memory area specified by I/O memory table (must be set by application) 58h WORD "IOMemSel2" selector for second I/O memory area 5Ah WORD "IOMemSel3" selector for third I/O memory area 5Ch WORD "IOMemSel4" selector for fourth I/O memory area 5Eh N BYTEs device-specific state buffer N WORDs I/O port access table (list of ports, last entry is FFFFh) N DWORDs I/O memory access table (list of physical-address/length pairs, last entry is FFFFFFFFh) N BYTEs 32-bit code for VBE/AF v1.0P function
Notes: All function pointers are offsets into the 32-bit code within the context buffer, and should be updated to point at the actual functions after the application has copied the buffer from the real-mode memory used for the interrupt call into its own flat-model memory space. Any functions which are not supported by the hardware have function pointers which are set to 00000000h initially
(Table 00090) Values for VBE/AF v1.0P color mixing mode: 00h replace 01h XOR with existing pixel 02h OR with existing pixel 03h AND with existing pixel
See Also: #00091 - #00090
(Table 00091) Call VBE/AF v1.0P function "SetForeColor" with:. ES:EDI -> device context buffer (see #00089). EAX = new foreground color (format varies by video mode). BL = new foreground mixing mode (see #00090)
See Also: #00089 - #00092 - #00107
(Table 00092) Call VBE/AF v1.0P function "SetbackColor" with:. ES:EDI -> device context buffer (see #00089). EAX = new background color (format varies by video mode). BL = new background mixing mode (see #00090)
See Also: #00089 - #00091 - #00093
(Table 00093) Call VBE/AF v1.0P function "SetClipRect" with:. ES:EDI -> device context buffer (see #00089). EAX = left clipping coordinate. EBX = top clipping coordinate. ECX = right clipping coordinate. EDX = bottom clipping coordinate
See Also: #00089 - #00092 - #00094 - #00107
(Table 00094) Call VBE/AF v1.0P function "DrawScan" with:. ES:EDI -> device context buffer (see #00089). EAX = X1 coordinate. EBX = Y coordinate. ECX = X2 coordinate
Desc: Draw a solid horizontal line from (X1,Y) to (X2,Y) in the currently- active foreground color and mix, omitting the pixel at the largest X coordinate
See Also: #00089 - #00093 - #00095 - #00098 - #00107
(Table 00095) Call VBE/AF v1.0P function "DrawScanList" with:. ES:EDI -> device context buffer (see #00089). EAX = Y coordinate of first line. EBX = length of scan list. DS:ESI -> scanline list X coordinates (2N WORDs)
Desc: Draw multiple solid horizontal lines at successive Y coordinates, using the currently-active foreground color and mix, omitting the pixel at the largest X coordinate for each line
Note: The scanline list consists of pairs of X coordinates; because the last pixel is omitted, a scanline will be skipped if X1==X2
See Also: #00089 - #00094 - #00096 - #00107
(Table 00096) Call VBE/AF v1.0P function "DrawRect" with:. ES:EDI -> device context buffer (see #00089). EAX = left coordinate. EBX = top coordinate. ECX = right coordinate. EDX = bottom coordinate
Desc: Draw a solid rectangle in the currently-active foreground color and mix, omitting the rightmost X coordinate and bottom-most scan line
Note: Results are undefined if EAX>ECX or EBX>EDX; nothing will be drawn if EAX=ECX or EBX=EDX
See Also: #00089 - #00094 - #00095 - #00097
(Table 00097) Call VBE/AF v1.0P function "DrawLine" with:. ES:EDI -> device context buffer (see #00089). EAX = ??? (specified this way in the draft documentation!). EBX = ???. ECX = ???. EDX = ???. ESI = ???
Desc: Draw a solid line in the currently-active foreground color and mix, given the Bresenham parameters
See Also: #00089 - #00094 - #00096 - #00098
(Table 00098) Call VBE/AF v1.0P function "DrawPattScan" with:. ES:EDI -> device context buffer (see #00089). EAX = X1 coordinate. EBX = Y coordinate. ECX = X2 coordinate. DL = 8-bit stipple pattern
Desc: Draw a patterned horizontal line from (X1,Y) to (X2,Y) in the currently-active foreground color and mix, omitting the pixel at the largest X coordinate
Note: For each pixel in the line, if DL bit (X mod 8) is set, the pixel is drawn, and left untouched if the bit is clear
See Also: #00089 - #00096 - #00097 - #00094 - #00099 - #00107
(Table 00099) Call VBE/AF v1.0P function "BitBlt" with:. ES:EDI -> device context buffer (see #00089). DS:ESI -> BitBlt parameter block (see #00100). BL = mix operation 00h replace 01h XOR 02h OR 03h AND
See Also: #00089 - #00094 - #00098 - #00101 - #00107
Format of VBE/AF BitBlt parameter block: Offset Size Description (Table 00100) 00h WORD left coordinate of source rectangle 02h WORD top coordinate of source rectangle 04h WORD right coordinate of source rectangle 06h WORD bottom coordinate of source rectangle 08h WORD left coordinate of destination rectangle 0Ah WORD top coordinate of destination rectangle
0Ch BYTE horizontal direction:
00h = decrement X, 01h = increment X0Dh BYTE vertical direction:
00h = decrement Y, 01h = increment Y
Notes: The rightmost pixel(s) and bottom-most scan line are not copied. The horizontal/vertical direction flags are used to ensure correct copies when the source and destination rectangles overlap
See Also: #00099
(Table 00101) Call VBE/AF v1.0P function "TransBitBlt" with:. ES:EDI -> device context buffer (see #00089). DS:ESI -> BitBlt parameter block (see #00100). BL = mix operation 00h replace 01h XOR 02h OR 03h AND. ECX = transparent color
Desc: Copy a rectangular area from one location to another, treating pixels with the specified color as transparent (leaving the destination unchanged)
See Also: #00089 - #00099 - #00102 - #00107
(Table 00102) Call VBE/AF v1.0P function "MonoBitBlt" with:. ES:EDI -> device context buffer (see #00089). DS:ESI -> BitBlt parameter block (see #00100). BL = mix operation 00h replace 01h XOR 02h OR 03h AND. BH = bit-plane from which to read
Desc: Copy a rectangular area from one location to another, expanding a single bit of each source pixel
See Also: #00089 - #00099 - #00101
(Table 00103) Call VBE/AF v1.0P function "SetCursor" with:. ES:EDI -> device context buffer (see #00089). DS -> application's data segment. ESI -> 32x32 cursor data, in Windows 3.1 cursor-file format (32 DWORDs of XOR mask followed by 32 DWORDs of AND mask)
See Also: #00089 - #00094 - #00104 - #00105
(Table 00104) Call VBE/AF v1.0P function "SetCursorPos" with:. ES:EDI -> device context buffer (see #00089). EAX = cursor X coordinate. EBX = cursor Y coordinate. CL = cursor's X hotspot. CH = cursor's Y hotspot
See Also: #00089 - #00103 - #00105
(Table 00105) Call VBE/AF v1.0P function "SetCursorColor" with:. ES:EDI -> device context buffer (see #00089). AL = 8-bit color index, or color's Red value. AH = color's Green value (16-bpp, 24-bpp, 32-bpp modes). BL = color's Blue value (16-bpp, 24-bpp, 32-bpp modes)
See Also: #00089 - #00103 - #00104 - #00106
(Table 00106) Call VBE/AF v1.0P function "ShowCursor" with:. ES:EDI -> device context buffer (see #00089). AL = new visibility (00h hide cursor, 01h show cursor)
See Also: #00089 - #00103 - #00104 - #00105
(Table 00107) Call VBE/AF v1.0P function "WaitTillIdle" with:. ES:EDI -> device context buffer (see #00089)
Desc: Pause until the hardware accelerator has completed all pending operations
See Also: #00089 - #00108 - #00109
(Table 00108) Call VBE/AF v1.0P function "EnableDirectAccess" with:. ES:EDI -> device context buffer (see #00089)
See Also: #00089 - #00109 - #00107 - AX=4F05h - #00078 - #00080
(Table 00109) Call VBE/AF v1.0P function "DisableDirectAccess" with:. ES:EDI -> device context buffer (see #00089)
See Also: #00089 - #00108
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