Mercurial > sdl-ios-xcode
view src/video/uikit/SDL_uikitappdelegate.m @ 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 | 99210400e8b9 |
children | 4ec48602f1db |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #import "SDL_uikitappdelegate.h" #import "SDL_uikitopenglview.h" #import "SDL_events_c.h" #import "jumphack.h" #ifdef main #undef main #endif extern int SDL_main(int argc, char *argv[]); static int forward_argc; static char **forward_argv; int main(int argc, char **argv) { int i; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; /* store arguments */ forward_argc = argc; forward_argv = (char **)malloc(argc * sizeof(char *)); for (i=0; i<argc; i++) { forward_argv[i] = malloc( (strlen(argv[i])+1) * sizeof(char)); strcpy(forward_argv[i], argv[i]); } /* Give over control to run loop, SDLUIKitDelegate will handle most things from here */ UIApplicationMain(argc, argv, NULL, @"SDLUIKitDelegate"); [pool release]; } @implementation SDLUIKitDelegate @synthesize window; /* convenience method */ +(SDLUIKitDelegate *)sharedAppDelegate { /* the delegate is set in UIApplicationMain(), which is garaunteed to be called before this method */ return (SDLUIKitDelegate *)[[UIApplication sharedApplication] delegate]; } - (id)init { self = [super init]; window = nil; return self; } - (void)applicationDidFinishLaunching:(UIApplication *)application { /* Set working directory to resource path */ [[NSFileManager defaultManager] changeCurrentDirectoryPath: [[NSBundle mainBundle] resourcePath]]; /* run the user's application, passing argc and argv */ int exit_status = SDL_main(forward_argc, forward_argv); /* free the memory we used to hold copies of argc and argv */ int i; for (i=0; i<forward_argc; i++) { free(forward_argv[i]); } free(forward_argv); /* exit, passing the return status from the user's application */ exit(exit_status); } - (void)applicationWillTerminate:(UIApplication *)application { SDL_SendQuit(); /* hack to prevent automatic termination. See SDL_uikitevents.m for details */ longjmp(*(jump_env()), 1); } -(void)dealloc { [window release]; [super dealloc]; } @end