annotate Xcode/TemplatesForXcodeTiger/SDL Cocoa Application/main.c @ 3333:b334b4f7dfa0

[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents 232e5e00e398
children
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1
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2 /* Simple program: Create a blank window, wait for keypress, quit.
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3
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4 Please see the SDL documentation for details on using the SDL API:
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5 /Developer/Documentation/SDL/docs.html
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <math.h>
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12
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13 #include "SDL.h"
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14
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15 int main(int argc, char *argv[])
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16 {
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17 Uint32 initflags = SDL_INIT_VIDEO; /* See documentation for details */
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18 SDL_Surface *screen;
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19 Uint8 video_bpp = 0;
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20 Uint32 videoflags = SDL_SWSURFACE;
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21 int done;
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22 SDL_Event event;
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23
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24 /* Initialize the SDL library */
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25 if ( SDL_Init(initflags) < 0 ) {
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26 fprintf(stderr, "Couldn't initialize SDL: %s\n",
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27 SDL_GetError());
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28 exit(1);
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29 }
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30
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31 /* Set 640x480 video mode */
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32 screen=SDL_SetVideoMode(640,480, video_bpp, videoflags);
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33 if (screen == NULL) {
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34 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
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35 video_bpp, SDL_GetError());
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36 SDL_Quit();
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37 exit(2);
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38 }
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39
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40 done = 0;
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41 while ( !done ) {
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42
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43 /* Check for events */
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44 while ( SDL_PollEvent(&event) ) {
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45 switch (event.type) {
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46
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47 case SDL_MOUSEMOTION:
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48 break;
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49 case SDL_MOUSEBUTTONDOWN:
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50 break;
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51 case SDL_KEYDOWN:
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52 /* Any keypress quits the app... */
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53 case SDL_QUIT:
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54 done = 1;
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55 break;
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56 default:
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57 break;
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58 }
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59 }
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60 }
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61
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62 /* Clean up the SDL library */
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63 SDL_Quit();
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64 return(0);
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65 }