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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; Copyright (c) 2022  Michal Necasek
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
; THE SOFTWARE.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; Define a macro which produces a DIB engine thunk, taking care of all
; externs and publics.
; The DIB_xxxExt functions take one additional parameter. To minimize
; stack space copying and usage, the thunk pops off the return address,
; pushes the additional parameter (always the last parameter of
; DIB_xxxExt), pushes the return address back, and jumps to DIB_xxxExt.
; The AX, ECX, and ES registers are modified with no ill effect since
; they aren't used by the Pascal calling convention to pass arguments.

;; Thunk macro with additional parameters.
DIBTHK	macro	name, param
extrn	DIB_&name&Ext : far
public	name
name:
	mov	ax, DGROUP	; Load ES with our data segment.
	mov	es, ax
	assume	es:DGROUP
	pop	ecx		; Save the 16:16 return address in ECX.
	push	param		; Push the additional parameter.
	push	ecx		; Put the return address back.
	jmp	DIB_&name&Ext	; Off to the DIB Engine we go.
	endm

;; Simple forwarder macro.
DIBFWD	macro	name
extrn	DIB_&name : far
public	name
name:
	jmp	DIB_&name	; Just jump to the DIB Engine.
	endm

;; Additional variables that need to be pushed are in the data segment.
_DATA	segment public 'DATA'

extrn	_lpDriverPDevice : dword
extrn	_wPalettized : word

_DATA	ends

DGROUP	group 	_DATA

_TEXT	segment	public 'CODE'

.386
assume	ds:nothing, es:nothing

;; Thunks that push an additional parameter.
;; Sorted by ordinal number.
DIBTHK	EnumObj, 		_lpDriverPDevice
DIBTHK	RealizeObject,		_lpDriverPDevice
DIBTHK	DibBlt,			_wPalettized
DIBTHK	GetPalette,		_lpDriverPDevice
DIBTHK	SetPaletteTranslate,	_lpDriverPDevice
DIBTHK	GetPaletteTranslate,	_lpDriverPDevice
DIBTHK	UpdateColors,		_lpDriverPDevice
;DIBTHK	SetCursor,		_lpDriverPDevice
;DIBTHK	MoveCursor,		_lpDriverPDevice

;; There is collision with driver's SetCursor ans WINAPI function of same name
;; and this is hack to resolve it without modify of headers
extrn	SetCursor_driver : far
public	SetCursor
SetCursor:
	jmp SetCursor_driver

;; Forwarders that simply jump to the DIB Engine.
;; Sorted by ordinal number.
ifndef HWBLT
DIBFWD	BitBlt
endif
DIBFWD	ColorInfo
;DIBFWD	Control
DIBFWD	EnumDFonts
DIBFWD	Output
DIBFWD	Pixel
DIBFWD	Strblt
DIBFWD	ScanLR
DIBFWD	DeviceMode
;DIBFWD	ExtTextOut
DIBFWD	GetCharWidth
DIBFWD	DeviceBitmap
DIBFWD	FastBorder
DIBFWD	SetAttribute
DIBFWD	CreateDIBitmap
DIBFWD	DibToDevice
DIBFWD	StretchBlt
DIBFWD	StretchDIBits
DIBFWD	SelectBitmap
DIBFWD	BitmapBits
DIBFWD	Inquire



_TEXT	ends

end