7kaa/asm/IB_DW.asm

; Seven Kingdoms: Ancient Adversaries
;
; Copyright 1997,1998 Enlight Software Ltd.
;
; 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 2 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/>.
;

;Filename    : IB_4.ASM
;Description : Blt a bitmap to the display surface buffer without color key transparency handling
; Width must be dword aligned


INCLUDE IMGFUN.inc

.CODE


;----------- BEGIN OF FUNCTION IMGbltDW ------------
;
; Put an non-compressed bitmap on image buffer.
; It does not handle color key transparency.
;
; Syntax : IMGbltDW( imageBuf, pitch, x, y, bitmapBuf )
;
; char *imageBuf - the pointer to the display surface buffer
; int  x,y       - where to put the image on the surface buffer
; char *bitmapPtr  - the pointer to the bitmap buffer
;
;-------------------------------------------------
;
; Format of the bitmap data :
;
; <short>  width
; <short>  height
; <char..> bitmap image
;
;-------------------------------------------------

		PUBLIC    IMGbltDW
IMGbltDW   	PROC   	  imageBuf, pitch, x, y, bitmapPtr
		STARTPROC

		MOV	EAX, imageBuf		; store the address of the image buffer to a variable
		MOV	image_buf, EAX

		;------ get the bitmap width and height -----;

		MOV     AX , DS
		MOV	ES , AX
		MOV     ESI, bitmapPtr

		XOR	EAX, EAX
		LODSW                            ; get bitmap width
		MOV     EBX, EAX

		LODSW                            ; get bitmap height
		MOV     ECX, EAX

		MOV	EDX, pitch	 ; EDX = lineDiff
		SUB	EDX, EBX		 ; lineDiff = pitch - bitmap_width
		SHR	EBX, 2			 ; no. of dword of each line
		CLD                              ; clear direction flag for MOVSB

		;------- pixels copying loop --------;

		CALC_ADDR EDI, x, y, pitch              ; Get the offset to the image buffer address
		MOV	EAX, ECX
		ALIGN	4
@@putLine:
		MOV     ECX, EBX
		REP MOVSD

		ADD	EDI, EDX		 ; EDX = lineDiff
		DEC	EAX
		JNZ	@@putLine		 ; decrease the remain height and loop

@@end:          ENDPROC
IMGbltDW   	ENDP

;----------- END OF FUNCTION IMGbltDW ----------


END