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