184 lines
6.6 KiB
C
184 lines
6.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Pacbox - a Pacman Emulator for Rockbox
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*
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* Based on PIE - Pacman Instructional Emulator
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*
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* Copyright (c) 1997-2003,2004 Alessandro Scotti
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "pacbox.h"
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#include "pacbox_lcd.h"
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#include "arcade.h"
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#include "hardware.h"
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void blit_display(fb_data* lcd_framebuffer, unsigned char* vbuf)
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{
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fb_data* dst;
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fb_data* next_dst;
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int x,y;
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#ifdef HAVE_LCD_COLOR
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#if LCD_SCALE==100 && LCD_ROTATE==0
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/* Native resolution = 224x288 */
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(void)next_dst;
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dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS];
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for (y=0;y<ScreenHeight;y++) {
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for (x=0;x<ScreenWidth;x++) {
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*(dst++) = palette[*(vbuf++)];
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}
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dst += XOFS*2;
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}
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#elif LCD_SCALE==100 && LCD_ROTATE==1
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/* Native resolution - rotated 90 degrees = 288x224 */
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next_dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS+ScreenHeight-1];
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for( y=ScreenHeight-1; y>=0; y-- ) {
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dst = (next_dst--);
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for( x=0; x<ScreenWidth; x++ ) {
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*dst = palette[*(vbuf++)];
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dst+=LCD_WIDTH;
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}
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}
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#elif LCD_SCALE==75 && LCD_ROTATE==1
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/* 0.75 scaling - display 3 out of 4 pixels - rotated = 216x168
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Skipping pixel #2 out of 4 seems to give the most legible display
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*/
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next_dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS+((ScreenHeight*3)/4)-1];
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for (y=ScreenHeight-1;y >= 0; y--) {
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if ((y & 3) != 1) {
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dst = (next_dst--);
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for (x=0;x<ScreenWidth;x++) {
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if ((x & 3) == 1) { vbuf++; }
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else {
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*dst = palette[*(vbuf++)];
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dst+=LCD_WIDTH;
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}
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}
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} else {
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vbuf+=ScreenWidth;
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}
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}
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#elif LCD_SCALE==75 && LCD_ROTATE==0
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/* 0.75 scaling - display 3 out of 4 pixels - = 168x216
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Skipping pixel #2 out of 4 seems to give the most legible display
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*/
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(void)next_dst;
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dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS];
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for (y=0;y<ScreenHeight;y++) {
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if ((y & 3) != 1) {
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for (x=0;x<ScreenWidth;x++) {
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if ((x & 3) == 1) { vbuf++; }
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else {
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*(dst++) = palette[*(vbuf++)];
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}
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}
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dst += XOFS*2;
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} else {
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vbuf+=ScreenWidth;
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}
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}
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#elif LCD_SCALE==50 && LCD_ROTATE==1
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/* 0.5 scaling - display every other pixel - rotated = 144x112 */
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next_dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS+ScreenHeight/2-1];
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for (y=(ScreenHeight/2)-1;y >= 0; y--) {
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dst = (next_dst--);
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for (x=0;x<ScreenWidth/2;x++) {
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*dst = palette[*(vbuf)];
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vbuf+=2;
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dst+=LCD_WIDTH;
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}
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vbuf+=ScreenWidth;
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}
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#elif LCD_SCALE==50 && LCD_ROTATE==0
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/* 0.5 scaling - display every other pixel
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* LCD_HEIGHT < 144: 112x144, crop to 112x128
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* else center vertically without clipping */
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(void)next_dst;
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dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS];
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/* Skip first YCLIP lines */
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vbuf+=ScreenWidth*YCLIP;
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/* Show regular screen */
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for (y=0;y<(ScreenHeight/2-YCLIP);y++) {
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for (x=0;x<ScreenWidth/2;x++) {
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*(dst++) = palette[*(vbuf)];
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vbuf+=2;
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}
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dst += XOFS*2;
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vbuf+=ScreenWidth;
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}
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#elif LCD_SCALE==40 && LCD_ROTATE==1
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/* 0.4 scaling - rotated = 116x90 */
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/* show 2 out of 5 pixels: 1st and 3rd anf 4th merged together */
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next_dst=&lcd_framebuffer[XOFS*LCD_WIDTH+YOFS+ScreenHeight*2/5-1];
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for (y=(ScreenHeight*2/5)-1;y >= 0; y--) {
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dst = (next_dst--);
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for (x=0;x<ScreenWidth*2/5;x++) {
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*dst = palette[*(vbuf)] | palette[*(vbuf+ScreenWidth+1)];
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/* every odd row number merge 2 source lines as one */
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if (y & 1) *dst |= palette[*(vbuf+ScreenWidth*2)];
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vbuf+=2;
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dst+=LCD_WIDTH;
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x++;
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/* every odd column merge 2 colums together */
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*dst = palette[*(vbuf)] | palette[*(vbuf+1)] |palette[*(vbuf+ScreenWidth+2)];
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if (y & 1) *dst |= palette[*(vbuf+ScreenWidth*2+1)];
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vbuf+=3;
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dst+=LCD_WIDTH;
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}
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vbuf+=ScreenWidth-1;
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if (y & 1) vbuf+=ScreenWidth;
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}
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#elif LCD_SCALE==33 && LCD_ROTATE==0
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/* 1/3 scaling - display every third pixel - 75x96 */
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(void)next_dst;
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dst=&lcd_framebuffer[YOFS*LCD_WIDTH+XOFS];
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for (y=0;y<ScreenHeight/3;y++) {
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for (x=0;x<ScreenWidth/3;x++) {
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*(dst++) = palette[*(vbuf)]
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| palette[*(vbuf+ScreenWidth+1)]
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| palette[*(vbuf+ScreenWidth*2+2)];
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vbuf+=3;
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}
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dst += XOFS*2;
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vbuf+=ScreenWidth*2+2;
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}
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#endif
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#else /* Greyscale LCDs */
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#if LCD_SCALE==50 && LCD_ROTATE==1
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#if LCD_PIXELFORMAT == VERTICAL_PACKING
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/* 0.5 scaling - display every other pixel = 144x112 */
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next_dst=&lcd_framebuffer[YOFS/4*LCD_WIDTH+XOFS+ScreenHeight/2-1];
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for (y=(ScreenHeight/2)-1;y >= 0; y--) {
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dst = (next_dst--);
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for (x=0;x<ScreenWidth/8;x++) {
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*dst = (palette[*(vbuf+6)]<<6) | (palette[*(vbuf+4)] << 4) | (palette[*(vbuf+2)] << 2) | palette[*(vbuf)];
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vbuf+=8;
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dst+=LCD_WIDTH;
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}
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vbuf+=ScreenWidth;
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}
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#endif /* Vertical Packing */
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#endif /* scale 50% rotated */
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#endif /* Not Colour */
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}
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