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/* $XConsortium: ibm8514imrd.s,v 1.2 94/03/29 09:37:41 dpw Exp $ */
/******************************************************************************
This is a assembly language version of the ibm8514ImageRead routine.
Written by Hans Nasten ( nasten@everyware.se ) AUG 29, 1993.
void
ibm8514ImageRead(x, y, w, h, psrc, pwidth, px, py, planemask)
int x;
int y;
int w;
int h;
unsigned char *psrc;
int pwidth;
int px;
int py;
short planemask;
******************************************************************************/
#define _8514_ASM_
#include "assyntax.h"
#include "reg8514.h"
AS_BEGIN
/*
* Defines for in arguments.
*/
#define x_arg REGOFF(8,EBP)
#define y_arg REGOFF(12,EBP)
#define w_arg REGOFF(16,EBP)
#define h_arg REGOFF(20,EBP)
#define psrc_arg REGOFF(24,EBP)
#define pwidth_arg REGOFF(28,EBP)
#define px_arg REGOFF(32,EBP)
#define py_arg REGOFF(36,EBP)
#define planemask_arg REGOFF(40,EBP)
SEG_TEXT
ALIGNTEXT4
GLOBL GLNAME(ibm8514ImageRead)
GLNAME(ibm8514ImageRead):
PUSH_L (EBP)
MOV_L (ESP,EBP)
PUSH_L (EDI)
PUSH_L (ESI)
PUSH_L (EBX)
/*
* Check if height or width is 0.
*/
MOV_L (w_arg,EDI)
MOV_L (h_arg,EBX)
OR_L (EDI,EDI)
JZ (.finish)
OR_L (EBX,EBX)
JZ (.finish)
/*
* Wait for 6 queue entries
*/
MOV_L (GP_STAT,EDX)
.wait_queue_0:
IN_B
TEST_B (CONST(0x04),AL)
JNZ (.wait_queue_0)
/*
* Init 8514 registers.
*/
MOV_L (FRGD_MIX,EDX)
MOV_W (CONST(0x0047),AX)
OUT_W
MOV_L (CUR_X,EDX)
MOV_W (x_arg,AX)
OUT_W
MOV_L (CUR_Y,EDX)
MOV_W (y_arg,AX)
OUT_W
/*
* If the width is odd, program the 8514 registers for width+1.
*/
MOV_L (MAJ_AXIS_PCNT,EDX)
MOV_W (w_arg,AX)
TEST_W (CONST(1),AX)
JNZ (.odd)
DEC_W (AX)
.odd:
OUT_W
.cont1:
/*
* Set height registers.
*/
MOV_L (MULTIFUNC_CNTL,EDX)
MOV_W (h_arg,AX)
DEC_W (AX)
/* OR_W (MIN_AXIS_PCNT,AX)*/
OUT_W
/*
* Give command to 8514.
* The command is : CMD_RECT | INC_Y | INC_X | DRAW
* | PCDATA | _16BIT | BYTSEQ);
*/
MOV_L (CMD,EDX)
MOV_W (GP_READ_CMD,AX)
OUT_W
/*
* Calculate a pointer to the first pixel on the first line.
*/
MOV_L (pwidth_arg,EAX)
MUL_L (py_arg)
ADD_L (px_arg,EAX)
MOV_L (psrc_arg,EDI)
ADD_L (EAX,EDI)
/*
* Wait until data is ready in the fifo.
*/
MOV_L (GP_STAT,EDX)
.wait_ready_1:
IN_W
TEST_W (DATARDY,AX)
JZ (.wait_ready_1)
/*
* Read the pixels line by line from the fifo.
*/
CLD
MOV_L (PIX_TRANS,EDX)
MOV_L (pwidth_arg,ESI)
SHR_L (CONST(1),ESI)
MOV_L (w_arg,EBX)
SHR_L (CONST(1),EBX)
SUB_L (EBX,ESI)
SHL_L (CONST(1),ESI)
MOV_W (planemask_arg,BX)
CMP_W (CONST(0xff),BX)
JZ (.get_all_planes)
MOV_L (ESI,pwidth_arg)
MOV_L (h_arg,ESI)
MOV_B (BL,BH)
TEST_W (CONST(1),w_arg)
JNZ (.odd_width_masked)
/*
* Even number of pixels on each line, but some of the bitplanes
* should be masked out.
*/
SHR_L (CONST(1),w_arg)
.next_even_line_masked:
MOV_L (w_arg,ECX)
.next_even_word_masked:
IN_W
AND_W (BX,AX)
STOS_W
LOOP (.next_even_word_masked)
ADD_L (pwidth_arg,EDI)
DEC_W (SI)
JNZ (.next_even_line_masked)
JMP (.all_done)
/*
* Odd number of pixels on each line, but some of the bitplanes
* should be masked out. Read an additional pixel on each line.
*/
.odd_width_masked:
SHR_L (CONST(1),w_arg)
.next_odd_line_masked:
MOV_L (w_arg,ECX)
AND_L (ECX,ECX)
JZ (.odd_masked_skip)
.next_odd_word_masked:
IN_W
AND_W (BX,AX)
STOS_W
LOOP (.next_odd_word_masked)
.odd_masked_skip:
IN_W
AND_B (BL,AL)
MOV_B (AL,REGIND(EDI))
ADD_L (pwidth_arg,EDI)
DEC_W (SI)
JNZ (.next_odd_line_masked)
JMP (.all_done)
/*
* All bitplanes is to be stored. Skip planemask anding.
*/
.get_all_planes:
MOV_W (h_arg,BX)
TEST_W (CONST(1),w_arg)
JNZ (.odd_width)
/*
* Even number of pixels on each line,
* read entire line with insw.
*/
MOV_L (w_arg,EBP)
SHR_L (CONST(1),EBP)
.next_even_line:
MOV_L (EBP,ECX)
REP
INS_W
ADD_L (ESI,EDI)
DEC_W (BX)
JNZ (.next_even_line)
JMP (.all_done)
/*
* Odd number of pixels on each line,
* read line with insw but read last pixel with inw.
*/
.odd_width:
MOV_L (w_arg,EBP)
SHR_L (CONST(1),EBP)
.next_odd_line:
MOV_L (EBP,ECX)
REP
INS_W
IN_W
MOV_B (AL,REGIND(EDI))
ADD_L (ESI,EDI)
DEC_W (BX)
JNZ (.next_odd_line)
/*
* Wait until room for 1 entry in the fifo.
*/
.all_done:
MOV_L (GP_STAT,EDX)
.wait_queue_2:
IN_B
TEST_B (CONST(0x80),AL)
JNZ (.wait_queue_2)
/*
* Reset FRGD_MIX to default.
*/
MOV_L (FRGD_MIX,EDX)
MOV_W (GP_DEF_FRGD_MIX,AX)
OUT_W
.finish:
POP_L (EBX)
POP_L (ESI)
POP_L (EDI)
POP_L (EBP)
RET
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