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- ;
- ; Command & Conquer Red Alert(tm)
- ; Copyright 2025 Electronic Arts Inc.
- ;
- ; This program is free software: you can redistribute it and/or modify
- ; it under the terms of the GNU General Public License as published by
- ; the Free Software Foundation, either version 3 of the License, or
- ; (at your option) any later version.
- ;
- ; This program is distributed in the hope that it will be useful,
- ; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ; GNU General Public License for more details.
- ;
- ; You should have received a copy of the GNU General Public License
- ; along with this program. If not, see <http://www.gnu.org/licenses/>.
- ;
- ;***************************************************************************
- ;** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
- ;***************************************************************************
- ;* *
- ;* Project Name : Calculate size of an MCGA region *
- ;* *
- ;* File Name : REGIONSZ.ASM *
- ;* *
- ;* Programmer : Barry W. Green *
- ;* *
- ;* Start Date : March 1, 1995 *
- ;* *
- ;* Last Update : March 1, 1995 [BWG] *
- ;* *
- ;*-------------------------------------------------------------------------*
- ;* Functions: *
- ;* VVPC::Size_Of_Region - calculate graphic buffer region size *
- ;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
- IDEAL
- P386
- MODEL USE32 FLAT
- INCLUDE ".\drawbuff.inc"
- INCLUDE ".\gbuffer.inc"
- GLOBAL Buffer_Size_Of_Region : NEAR
- CODESEG
- ;***************************************************************************
- ;* VVPC::Size_Of_Region - calculate buffer region size *
- ;* *
- ;* INPUT: DWORD the width of the region *
- ;* *
- ;* DWORD the height of the region *
- ;* *
- ;* OUTPUT: calculated size of the region (size = width * height) *
- ;* *
- ;* *
- ;* HISTORY: *
- ;* 03/01/1995 BWG : Created. *
- ;*=========================================================================*
- PROC Buffer_Size_Of_Region C near
- USES ebx,ecx,edx
- ARG this_object:DWORD ; this is a member function
- ARG region_width:DWORD ; width of region
- ARG region_height:DWORD ; height of region
- ;*===================================================================
- ; Get the viewport information
- ;*===================================================================
- mov ebx,[this_object] ; get a pointer to viewport
- xor eax,eax
- mov ecx,[(GraphicViewPort ebx).GVPHeight] ; ecx = height of viewport
- mov edx,[(GraphicViewPort ebx).GVPWidth] ; edx = width of viewport
- ;*===================================================================
- ; Verify that the width is legal
- ;*===================================================================
- mov eax,[region_width] ; find the width
- cmp eax,edx ; is it too wide?
- jb short ??wok ; if not, leave it alone
- mov eax,edx ; otherwise clip it
- ;*===================================================================
- ; Verify that the height is ok
- ;*===================================================================
- ??wok: mov ebx,[region_height] ; get the height
- cmp ebx,ecx ; is it too tall?
- jb ??hok ; if not, leave it alone
- mov ebx,ecx ; otherwise clip it
- ;*===================================================================
- ; Now multiply 'em to calculate the size of the region
- ;*===================================================================
- ??hok: mul ebx ; size = w * h
- ret
- ENDP Buffer_Size_Of_Region
- END
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