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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2006 Fredrik Ohrn
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "pacbox.h"
.section .text
.align 2
#ifdef IRIVER_H300_SERIES
.global blit_display
/*
0.75 scaling - display 3 out of 4 pixels = 216x168
Skipping pixel #2 out of 4 seems to give the most legible display
void blit_display(fb_data* lcd_framebuffer, unsigned char* vbuf)
{
next_dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS+((ScreenHeight*3)/4)-1];
for (y=ScreenHeight-1;y >= 0; y--) {
if ((y & 3) != 1) {
dst = (next_dst--);
for (x=0;x<ScreenWidth;x++) {
if ((x & 3) == 1) { vbuf++; }
else {
*dst = palette[*(vbuf++)];
dst+=LCD_WIDTH;
}
}
} else {
vbuf+=ScreenWidth;
}
}
}
*/
/* FIXME: ScreenWidth & ScreenHeight are defined in arcade.h, but all
hell breaks loose if you include it... */
#define ScreenWidth 224
#define ScreenHeight 288
#define SHRUNK_WIDTH ((ScreenWidth/4)*3)
#define SHRUNK_HEIGHT ((ScreenHeight/4)*3)
#define BD_SAVE (9 * 4)
process_4_pixels:
move.b %d4, %d2
move.w (%a1, %d2.l * 2), %d3
move.w %d3, (2 * LCD_WIDTH * 2)(%a0)
lsr.l #8, %d4
move.b %d4, %d2
move.w (%a1, %d2.l * 2), %d3
move.w %d3, (1 * LCD_WIDTH * 2)(%a0)
swap.w %d4
move.b %d4, %d2
move.w (%a1, %d2.l * 2), (%a0)
lea.l 3 * LCD_WIDTH * 2(%a0), %a0
rts
process_line:
move.l %a3, %d1
bd_x_loop:
movem.l (%a2), %d4-%d7 // Read 16 pixels
bsr.s process_4_pixels
move.l %d5, %d4
bsr.s process_4_pixels
move.l %d6, %d4
bsr.s process_4_pixels
move.l %d7, %d4
bsr.s process_4_pixels
lea 16(%a2), %a2
subq.l #1, %d1;
bne.s bd_x_loop
rts
blit_display:
lea -BD_SAVE(%sp), %sp
movem.l %d2-%d7/%a2-%a4, (%sp)
move.l BD_SAVE + 4(%sp), %a0 // lcd_framebuffer
move.l BD_SAVE + 8(%sp), %a2 // vbuf
lea palette, %a1
lea.l ((YOFS * LCD_WIDTH + XOFS + SHRUNK_HEIGHT) * 2)(%a0), %a0
move.l #(ScreenHeight / 4), %d0
move.l #(ScreenWidth / 16), %a3
move.l #(LCD_WIDTH * SHRUNK_WIDTH + 1) * 2, %a4
moveq.l #0, %d2
bd_y_loop:
bsr.s process_line
suba.l %a4, %a0
lea.l ScreenWidth(%a2), %a2 // Skip 1 line
bsr.s process_line
suba.l %a4, %a0
bsr.s process_line
suba.l %a4, %a0
subq.l #1, %d0
bne bd_y_loop
movem.l (%sp), %d2-%d7/%a2-%a4
lea.l BD_SAVE(%sp), %sp
rts
#endif /* IRIVER_H300_SERIES */
/* See arcade.c for the C implementation of drawChar */
/* Note! This version does not handle flipped screen mode. */
.global drawChar
#define DC_SAVE (4 * 4)
drawChar:
lea -DC_SAVE(%sp), %sp
movem.l %d2-%d5, (%sp)
movea.l DC_SAVE + 4(%sp), %a0 // buffer
move.l DC_SAVE + 16(%sp), %d0 // oy
move.l %d0, %d1
lsl.l #8, %d0
lsl.l #5, %d1
sub.l %d1, %d0
adda.l %d0, %a0
adda.l DC_SAVE + 12(%sp), %a0 // ox
move.l DC_SAVE + 20(%sp), %d0 // color
and.l #0x3F, %d0
bne.s have_color
moveq.l #8, %d1
moveq.l #0, %d2
moveq.l #0, %d3
clear_loop:
movem.l %d2-%d3, (%a0)
lea 224(%a0), %a0
subq.l #1, %d1
bne.s clear_loop
bra.s dc_exit
have_color:
lsl.l #2, %d0
lea.l charmap_, %a1
move.l DC_SAVE + 8(%sp), %d2 // index
lsl.l #6, %d2
adda.l %d2, %a1
moveq.l #8, %d1
moveq.l #0, %d3
moveq.l #24, %d5
dc_y_loop:
move.l (%a1)+, %d3
move.l %d3, %d4
move.l %d3, %d2 // Pixel 1
lsr.l %d5, %d2
add.l %d0, %d2
lsl.l #8, %d2
swap.w %d4 // Pixel 2
move.b %d4, %d2
add.l %d0, %d2
lsl.l #8, %d2
lsr.l #8, %d3 // Pixel 3
move.b %d3, %d2
add.l %d0, %d2
lsl.l #8, %d2
swap.w %d4 // Pixel 4
move.b %d4, %d2
add.l %d0, %d2
move.l %d2, (%a0)+
move.l (%a1)+, %d3
move.l %d3, %d4
move.l %d3, %d2 // Pixel 1
lsr.l %d5, %d2
add.l %d0, %d2
lsl.l #8, %d2
swap.w %d4 // Pixel 2
move.b %d4, %d2
add.l %d0, %d2
lsl.l #8, %d2
lsr.l #8, %d3 // Pixel 3
move.b %d3, %d2
add.l %d0, %d2
lsl.l #8, %d2
swap.w %d4 // Pixel 4
move.b %d4, %d2
add.l %d0, %d2
move.l %d2, (%a0)+
lea 216(%a0), %a0
subq.l #1, %d1
bne.s dc_y_loop
dc_exit:
movem.l (%sp), %d2-%d5
lea.l DC_SAVE(%sp), %sp
rts
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