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annotate src/video/xbios/SDL_xbios_blowup.c @ 1259:36f24cdfcda7

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te: Thu, 17 Apr 2003 11:25:26 -0700 From: "Jim" Subject: [SDL] Frame buffer patches... Would seem that GCC 3.2.2 promotes all signed values to unsigned if any single vlaue is unsigned in an expression... for instance when calculating an elo touch position....evertyhign is an (int) except for cach_vinfo.xres which is unsigned. THerefore if y ou reverse the SDL_ELO_MIN_X and SDL_ELO_MAX_X values the resulging negative value pegs the expression to it's max. Attached it the accumu lated patch to typecast the unsigned values to (int) - *dx = (cache_vinfo.xres - (cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); + *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); and also to provide quite failure to operations which have the screen currently locked... The touch screen I'm using the original values were exactly opposite of any position I touched on the screen - evaluating the math the expr ession SHOULD have handled reversing the min and max values - and after casting the unsigned .xres and .yres to a signed int - worked well. .. Jim
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Jan 2006 06:36:43 +0000
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children d910939febfa
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 Blowup extension definitions
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25
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26 Patrice Mandin
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27 */
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28
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29 #include <mint/falcon.h>
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30
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31 #include "SDL_xbios.h"
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32 #include "SDL_xbios_blowup.h"
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33
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34 void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow)
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35 {
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36 int i, num_mode, bank;
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37 blow_mode_t *blow_mode;
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38
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39 /* Add bit 15 for old modes */
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40 for (i=0;i<XBIOS_nummodes;i++) {
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41 XBIOS_modelist[i].number |= 1<<15;
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42 }
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43
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44 /* Add Blowup modes for 8 and 16 bpp */
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45 for (num_mode=3; num_mode<5; num_mode++) {
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46 bank = cookie_blow->num_mode[num_mode];
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47 blow_mode = &(cookie_blow->blowup_modes[num_mode+(bank*5)]);
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48
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49 /* Check extended mode enabled */
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50 if (blow_mode->enabled == 0) {
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51 /* Check monitor needed for this mode */
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52 if ((blow_mode->monitor == cookie_blow->montype)
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53 || ((blow_mode->monitor == MONITOR_TV)
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54 && (cookie_blow->montype == MONITOR_RGB))
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55 || ((blow_mode->monitor == MONITOR_RGB)
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56 && (cookie_blow->montype == MONITOR_TV)))
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57 {
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58 /* we can use this extended mode */
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59 SDL_XBIOS_AddMode(this,
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60 num_mode == 3 ? BPS8 : BPS16,
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61 blow_mode->width + 1,
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62 blow_mode->height + 1,
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63 num_mode == 3 ? 8 : 16,
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64 SDL_FALSE
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65 );
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66 }
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67 }
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68 }
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69 }