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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
parents ab40b9b2d0d5
children 546f7c1eb755
line wrap: on
line source

.TH "SDL_ResizeEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_ResizeEvent\- Window resize event structure
.SH "STRUCTURE DEFINITION"
.PP
.nf
\f(CWtypedef struct{
  Uint8 type;
  int w, h;
} SDL_ResizeEvent;\fR
.fi
.PP
.SH "STRUCTURE DATA"
.TP 20
\fBtype\fR
\fBSDL_VIDEORESIZE\fP
.TP 20
\fBw\fR, \fBh\fR
New width and height of the window
.SH "DESCRIPTION"
.PP
\fBSDL_ResizeEvent\fR is a member of the \fI\fBSDL_Event\fR\fR union and is used when an event of type \fBSDL_VIDEORESIZE\fP is reported\&.
.PP
When \fBSDL_RESIZABLE\fP is passed as a \fBflag\fR to \fI\fBSDL_SetVideoMode\fP\fR the user is allowed to resize the applications window\&. When the window is resized an \fBSDL_VIDEORESIZE\fP is report, with the new window width and height values stored in \fBw\fR and \fBh\fR, respectively\&. When an \fBSDL_VIDEORESIZE\fP is received the window should be resized to the new dimensions using \fI\fBSDL_SetVideoMode\fP\fR\&.
.SH "SEE ALSO"
.PP
\fI\fBSDL_Event\fR\fR, \fI\fBSDL_SetVideoMode\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59