1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (c) 2006 Dave Chapman
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
24 .section .icode,"ax",%progbits
27 /* void blit_display(fb_data* lcd_framebuffer, unsigned char* vbuf)
29 next_dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS+ScreenHeight-1];
30 for( y=ScreenHeight; y>0; y-- ) {
32 for( x=ScreenWidth; x>0; x-- ) {
33 *dst = palette[*(vbuf++)];
40 #if (LCD_WIDTH >= 288) && (LCD_HEIGHT >= 224)
43 stmdb sp!, {r4-r11, lr}
46 add r3, r3, #24 @ 5720 = (2*(YOFS*LCD_WIDTH+XOFS+ScreenHeight-4))
48 mov lr, #288 @ y = 288
50 loop_y: mov r2, r3 @ r2 = next_dst
51 sub r3, r3, #8 @ next_dst-=4
53 mov ip, #224 @ x = 224
55 /* store 2 input bytes from the next four lines in r7-r10 */
57 ldrh r8, [r1, #224] @ r8 = vbuf[224]
58 ldrh r7, [r1] @ r7 = vbuf[0]
60 ldrh r10, [r1, #224] @ r10 = vbuf[224*3]
61 ldrh r9, [r1], #2 @ r9 = vbuf[224*2] ; vbuf += 2;
65 /* Convert high bytes of r7-r10 into palette entries in r5 and r6 */
68 ldrh r6, [r6, r0] @ r6 = palette[hi(r7]]
72 ldrh r11, [r11, r0] @ r11 = palette[hi(r8]]
74 orr r6, r11, r6, lsl #16 @ r6 = palette[hi(r8]]
75 @ | (palette[hi(r7)] << 16)
79 ldrh r5, [r5, r0] @ r5 = palette[hi(r9]]
83 ldrh r11, [r11, r0] @ r11 = palette[hi(r10)]]
85 orr r5, r11, r5, lsl #16 @ r5 = palette[hi(r10]]
86 @ | (palette[hi(r9)] << 16)
88 /* Convert low bytes of r7-r10 into palette entries in r7 and r8 */
97 orr r8, r8, r7, lsl #16
107 orr r7, r10, r9, lsl #16
109 /* Now write the 8 pixels to the screen */
111 add r2, r2, #(LCD_WIDTH*2)-8 @ dst += LCD_WIDTH
114 add r2, r2, #(LCD_WIDTH*2)-8 @ dst += LCD_WIDTH
117 subs ip, ip, #2 @ x-=2
121 add r1, r1, #224*3 @ vbuf += 224*3
122 subs lr, lr, #4 @ y-=4
123 ldmeqia sp!, {r4-r11, pc}