Mercurial > sdl-ios-xcode
view test/testbitmap.c @ 615:7ec821f3cbd0
Date: Thu, 17 Apr 2003 23:27:34 -0400
From: Darrell Walisser
Subject: Yet another OS X cursor bug
The synopsis:
1. Call SDL_ShowCursor(0);
2. Call SDL_SetVideoMode();
3. Call SDL_GetEvent();
3. Call SDL_ShowCursor(1);
The result: Sometimes the cursor doesn't come back! Ack! Oddly enough,
it does come back when mousing over the dock or clicking in the menu
bar. But that's besides the point.
The reason why this is happening is a flaw in the handling of
activation/deactivation events. The short explanation is that the
HideCursor() and ShowCursor() calls must be balanced, but if the cursor
was initially hidden, HideCursor() was called again on the activate
event - so now the next ShowCursor() fails (as does the next, and the
next, for some reason).
So, here's the patch. All it does is keep track of the
HideCursor()/ShowCursor() calls so that they will always be balanced.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 20 Apr 2003 05:41:16 +0000 |
parents | 74212992fb08 |
children | 609543e2b3a1 |
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line source
/* Simple program: Test bitmap blits */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL.h" #include "picture.xbm" SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits) { SDL_Surface *bitmap; Uint8 *line; /* Allocate the bitmap */ bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0); if ( bitmap == NULL ) { fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError()); return(NULL); } /* Copy the pixels */ line = (Uint8 *)bitmap->pixels; w = (w+7)/8; while ( h-- ) { memcpy(line, bits, w); /* X11 Bitmap images have the bits reversed */ { int i, j; Uint8 *buf, byte; for ( buf=line, i=0; i<w; ++i, ++buf ) { byte = *buf; *buf = 0; for ( j=7; j>=0; --j ) { *buf |= (byte&0x01)<<j; byte >>= 1; } } } line += bitmap->pitch; bits += w; } return(bitmap); } int main(int argc, char *argv[]) { SDL_Surface *screen; SDL_Surface *bitmap; Uint8 video_bpp; Uint32 videoflags; Uint8 *buffer; int i, done; SDL_Event event; /* Initialize SDL */ if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); exit(1); } atexit(SDL_Quit); video_bpp = 0; videoflags = SDL_SWSURFACE; while ( argc > 1 ) { --argc; if ( strcmp(argv[argc-1], "-bpp") == 0 ) { video_bpp = atoi(argv[argc]); --argc; } else if ( strcmp(argv[argc], "-warp") == 0 ) { videoflags |= SDL_HWPALETTE; } else if ( strcmp(argv[argc], "-hw") == 0 ) { videoflags |= SDL_HWSURFACE; } else if ( strcmp(argv[argc], "-fullscreen") == 0 ) { videoflags |= SDL_FULLSCREEN; } else { fprintf(stderr, "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", argv[0]); exit(1); } } /* Set 640x480 video mode */ if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", video_bpp, SDL_GetError()); exit(2); } /* Set the surface pixels and refresh! */ if ( SDL_LockSurface(screen) < 0 ) { fprintf(stderr, "Couldn't lock the display surface: %s\n", SDL_GetError()); exit(2); } buffer=(Uint8 *)screen->pixels; for ( i=0; i<screen->h; ++i ) { memset(buffer,(i*255)/screen->h, screen->pitch); buffer += screen->pitch; } SDL_UnlockSurface(screen); SDL_UpdateRect(screen, 0, 0, 0, 0); /* Load the bitmap */ bitmap = LoadXBM(screen, picture_width, picture_height, (Uint8 *)picture_bits); if ( bitmap == NULL ) { exit(1); } /* Wait for a keystroke */ done = 0; while ( !done ) { /* Check for events */ while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_MOUSEBUTTONDOWN: { SDL_Rect dst; dst.x = event.button.x - bitmap->w/2; dst.y = event.button.y - bitmap->h/2; dst.w = bitmap->w; dst.h = bitmap->h; SDL_BlitSurface(bitmap, NULL, screen, &dst); SDL_UpdateRects(screen,1,&dst); } break; case SDL_KEYDOWN: /* Any key press quits the app... */ done = 1; break; case SDL_QUIT: done = 1; break; default: break; } } } SDL_FreeSurface(bitmap); return(0); }