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[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 546f7c1eb755
children 1238da4a7112
line wrap: on
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.TH "SDL_InitSubSystem" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_InitSubSystem \- Initialize subsystems
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBint \fBSDL_InitSubSystem\fP\fR(\fBUint32 flags\fR);
.SH "DESCRIPTION"
.PP
After SDL has been initialized with \fI\fBSDL_Init\fP\fR you may initialize uninitialized subsystems with \fBSDL_InitSubSystem\fP\&. The \fBflags\fR parameter is the same as that used in \fI\fBSDL_Init\fP\fR\&.
.SH "EXAMPLES"
.PP
.nf
\f(CW/* Seperating Joystick and Video initialization\&. */
SDL_Init(SDL_INIT_VIDEO);
\&.
\&.
SDL_SetVideoMode(640, 480, 16, SDL_DOUBLEBUF|SDL_FULLSCREEN);
\&.
/* Do Some Video stuff */
\&.
\&.
/* Initialize the joystick subsystem */
SDL_InitSubSystem(SDL_INIT_JOYSTICK);

/* Do some stuff with video and joystick */
\&.
\&.
\&.
/* Shut them both down */
SDL_Quit();\fR
.fi
.PP
.SH "RETURN VALUE"
.PP
Returns \fB-1\fR on an error or \fB0\fR on success\&.
.SH "SEE ALSO"
.PP
\fI\fBSDL_Init\fP\fR, \fI\fBSDL_Quit\fP\fR, \fI\fBSDL_QuitSubSystem\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00