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SDL_video.c
2664 lines (2416 loc) · 57 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* The high-level video driver subsystem */
#include "SDL.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_pixels_c.h"
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#include "SDL_renderer_gl.h"
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#include "SDL_renderer_gles.h"
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#include "SDL_renderer_sw.h"
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#include "../events/SDL_sysevents.h"
#include "../events/SDL_events_c.h"
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#if SDL_VIDEO_OPENGL_ES
#include "SDL_opengles.h"
#endif /* SDL_VIDEO_OPENGL_ES */
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#if SDL_VIDEO_OPENGL
#include "SDL_opengl.h"
/* On Windows, windows.h defines CreateWindow */
#ifdef CreateWindow
#undef CreateWindow
#endif
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#endif /* SDL_VIDEO_OPENGL */
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/* Available video drivers */
static VideoBootStrap *bootstrap[] = {
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#if SDL_VIDEO_DRIVER_COCOA
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&COCOA_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_X11
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&X11_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_NANOX
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&NX_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_IPOD
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&iPod_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_WSCONS
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&WSCONS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_FBCON
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&FBCON_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_DIRECTFB
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&DirectFB_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_PS2GS
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&PS2GS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_VGL
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&VGL_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_SVGALIB
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&SVGALIB_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_GAPI
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&GAPI_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_WIN32
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&WIN32_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_BWINDOW
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&BWINDOW_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_PHOTON
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&ph_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_EPOC
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&EPOC_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_XBIOS
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&XBIOS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_GEM
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&GEM_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_DC
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&DC_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_RISCOS
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&RISCOS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_OS2FS
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&OS2FSLib_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_NDS
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&NDS_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_UIKIT
&UIKIT_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_DUMMY
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&DUMMY_bootstrap,
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#endif
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NULL
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};
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static SDL_VideoDevice *_this = NULL;
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/* Various local functions */
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int SDL_VideoInit(const char *driver_name, Uint32 flags);
void SDL_VideoQuit(void);
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static int
cmpmodes(const void *A, const void *B)
{
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SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
SDL_DisplayMode b = *(const SDL_DisplayMode *) B;
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if (a.w != b.w) {
return b.w - a.w;
}
if (a.h != b.h) {
return b.h - a.h;
}
if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
}
if (a.refresh_rate != b.refresh_rate) {
return b.refresh_rate - a.refresh_rate;
}
return 0;
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}
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static void
SDL_UninitializedVideo()
{
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SDL_SetError("Video subsystem has not been initialized");
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}
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int
SDL_GetNumVideoDrivers(void)
{
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return SDL_arraysize(bootstrap) - 1;
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}
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const char *
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SDL_GetVideoDriver(int index)
{
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if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
return bootstrap[index]->name;
}
return NULL;
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}
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/*
* Initialize the video and event subsystems -- determine native pixel format
*/
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int
SDL_VideoInit(const char *driver_name, Uint32 flags)
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{
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SDL_VideoDevice *video;
int index;
int i;
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/* Toggle the event thread flags, based on OS requirements */
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#if defined(MUST_THREAD_EVENTS)
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flags |= SDL_INIT_EVENTTHREAD;
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#elif defined(CANT_THREAD_EVENTS)
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if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
SDL_SetError("OS doesn't support threaded events");
return -1;
}
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#endif
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/* Start the event loop */
if (SDL_StartEventLoop(flags) < 0) {
return -1;
}
/* Check to make sure we don't overwrite '_this' */
if (_this != NULL) {
SDL_VideoQuit();
}
/* Select the proper video driver */
index = 0;
video = NULL;
if (driver_name == NULL) {
driver_name = SDL_getenv("SDL_VIDEODRIVER");
}
if (driver_name != NULL) {
for (i = 0; bootstrap[i]; ++i) {
if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
if (bootstrap[i]->available()) {
video = bootstrap[i]->create(index);
}
break;
}
}
} else {
for (i = 0; bootstrap[i]; ++i) {
if (bootstrap[i]->available()) {
video = bootstrap[i]->create(index);
if (video != NULL) {
break;
}
}
}
}
if (video == NULL) {
if (driver_name) {
SDL_SetError("%s not available", driver_name);
} else {
SDL_SetError("No available video device");
}
return -1;
}
_this = video;
_this->name = bootstrap[i]->name;
_this->next_object_id = 1;
/* Set some very sane GL defaults */
_this->gl_config.driver_loaded = 0;
_this->gl_config.dll_handle = NULL;
_this->gl_config.red_size = 3;
_this->gl_config.green_size = 3;
_this->gl_config.blue_size = 2;
_this->gl_config.alpha_size = 0;
_this->gl_config.buffer_size = 0;
_this->gl_config.depth_size = 16;
_this->gl_config.stencil_size = 0;
_this->gl_config.double_buffer = 1;
_this->gl_config.accum_red_size = 0;
_this->gl_config.accum_green_size = 0;
_this->gl_config.accum_blue_size = 0;
_this->gl_config.accum_alpha_size = 0;
_this->gl_config.stereo = 0;
_this->gl_config.multisamplebuffers = 0;
_this->gl_config.multisamplesamples = 0;
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_this->gl_config.retained_backing = 1;
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_this->gl_config.accelerated = -1; /* not known, don't set */
/* Initialize the video subsystem */
if (_this->VideoInit(_this) < 0) {
SDL_VideoQuit();
return -1;
}
/* Make sure some displays were added */
if (_this->num_displays == 0) {
SDL_SetError("The video driver did not add any displays");
SDL_VideoQuit();
return (-1);
}
/* The software renderer is always available */
for (i = 0; i < _this->num_displays; ++i) {
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#if SDL_VIDEO_RENDER_OGL
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SDL_AddRenderDriver(i, &GL_RenderDriver);
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#endif
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#if SDL_VIDEO_RENDER_OGL_ES
SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
#endif
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if (_this->displays[i].num_render_drivers > 0) {
SDL_AddRenderDriver(i, &SW_RenderDriver);
}
}
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/* We're ready to go! */
return 0;
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}
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const char *
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SDL_GetCurrentVideoDriver()
{
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if (!_this) {
SDL_UninitializedVideo();
return NULL;
}
return _this->name;
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}
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SDL_VideoDevice *
SDL_GetVideoDevice()
{
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return _this;
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}
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int
SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
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{
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SDL_VideoDisplay display;
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SDL_zero(display);
if (desktop_mode) {
display.desktop_mode = *desktop_mode;
}
display.current_mode = display.desktop_mode;
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return SDL_AddVideoDisplay(&display);
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}
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int
SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
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{
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SDL_VideoDisplay *displays;
int index = -1;
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displays =
SDL_realloc(_this->displays,
(_this->num_displays + 1) * sizeof(*displays));
if (displays) {
index = _this->num_displays++;
displays[index] = *display;
displays[index].device = _this;
_this->displays = displays;
} else {
SDL_OutOfMemory();
}
return index;
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}
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int
SDL_GetNumVideoDisplays(void)
{
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if (!_this) {
SDL_UninitializedVideo();
return 0;
}
return _this->num_displays;
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}
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int
SDL_SelectVideoDisplay(int index)
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{
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if (!_this) {
SDL_UninitializedVideo();
return (-1);
}
if (index < 0 || index >= _this->num_displays) {
SDL_SetError("index must be in the range 0 - %d",
_this->num_displays - 1);
return -1;
}
_this->current_display = index;
return 0;
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}
int
SDL_GetCurrentVideoDisplay(void)
{
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if (!_this) {
SDL_UninitializedVideo();
return (-1);
}
return _this->current_display;
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}
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SDL_bool
SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
{
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SDL_VideoDisplay *display = &_this->displays[displayIndex];
SDL_DisplayMode *modes;
int i, nmodes;
/* Make sure we don't already have the mode in the list */
modes = display->display_modes;
nmodes = display->num_display_modes;
for (i = nmodes; i--;) {
if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
return SDL_FALSE;
}
}
/* Go ahead and add the new mode */
if (nmodes == display->max_display_modes) {
modes =
SDL_realloc(modes,
(display->max_display_modes + 32) * sizeof(*modes));
if (!modes) {
return SDL_FALSE;
}
display->display_modes = modes;
display->max_display_modes += 32;
}
modes[nmodes] = *mode;
display->num_display_modes++;
return SDL_TRUE;
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}
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int
SDL_GetNumDisplayModes()
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{
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if (_this) {
SDL_VideoDisplay *display = &SDL_CurrentDisplay;
if (!display->num_display_modes && _this->GetDisplayModes) {
_this->GetDisplayModes(_this);
SDL_qsort(display->display_modes, display->num_display_modes,
sizeof(SDL_DisplayMode), cmpmodes);
}
return display->num_display_modes;
}
return 0;
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}
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int
SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
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{
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if (index < 0 || index >= SDL_GetNumDisplayModes()) {
SDL_SetError("index must be in the range of 0 - %d",
SDL_GetNumDisplayModes() - 1);
return -1;
}
if (mode) {
*mode = SDL_CurrentDisplay.display_modes[index];
}
return 0;
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}
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int
SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
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{
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if (!_this) {
SDL_UninitializedVideo();
return -1;
}
if (mode) {
*mode = SDL_CurrentDisplay.desktop_mode;
}
return 0;
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}
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int
SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
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{
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if (!_this) {
SDL_UninitializedVideo();
return -1;
}
if (mode) {
*mode = SDL_CurrentDisplay.current_mode;
}
return 0;
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}
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SDL_DisplayMode *
SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
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SDL_DisplayMode * closest)
{
Uint32 target_format;
int target_refresh_rate;
int i;
SDL_DisplayMode *current, *match;
if (!_this || !mode || !closest) {
return NULL;
}
/* Default to the desktop format */
if (mode->format) {
target_format = mode->format;
} else {
target_format = SDL_CurrentDisplay.desktop_mode.format;
}
/* Default to the desktop refresh rate */
if (mode->refresh_rate) {
target_refresh_rate = mode->refresh_rate;
} else {
target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
}
match = NULL;
for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
current = &SDL_CurrentDisplay.display_modes[i];
if ((current->w && current->h) &&
(current->w < mode->w || current->h < mode->h)) {
/* Out of sorted modes large enough here */
break;
}
if (!match || current->w < match->w || current->h < match->h) {
match = current;
continue;
}
if (current->format != match->format) {
/* Sorted highest depth to lowest */
if (current->format == target_format ||
(SDL_BITSPERPIXEL(current->format) >=
SDL_BITSPERPIXEL(target_format)
&& SDL_PIXELTYPE(current->format) ==
SDL_PIXELTYPE(target_format))) {
match = current;
}
continue;
}
if (current->refresh_rate != match->refresh_rate) {
/* Sorted highest refresh to lowest */
if (current->refresh_rate >= target_refresh_rate) {
match = current;
}
}
}
if (match) {
if (match->format) {
closest->format = match->format;
} else {
closest->format = mode->format;
}
if (match->w && match->h) {
closest->w = match->w;
closest->h = match->h;
} else {
closest->w = mode->w;
closest->h = mode->h;
}
if (match->refresh_rate) {
closest->refresh_rate = match->refresh_rate;
} else {
closest->refresh_rate = mode->refresh_rate;
}
closest->driverdata = match->driverdata;
/*
* Pick some reasonable defaults if the app and driver don't
* care
*/
if (!closest->format) {
closest->format = SDL_PIXELFORMAT_RGB888;
}
if (!closest->w) {
closest->w = 640;
}
if (!closest->h) {
closest->h = 480;
}
return closest;
}
return NULL;
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}
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int
SDL_SetDisplayMode(const SDL_DisplayMode * mode)
{
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SDL_VideoDisplay *display;
SDL_DisplayMode display_mode;
SDL_DisplayMode current_mode;
int i, ncolors;
if (!_this) {
SDL_UninitializedVideo();
return -1;
}
display = &SDL_CurrentDisplay;
if (!mode) {
mode = &display->desktop_mode;
}
display_mode = *mode;
/* Default to the current mode */
if (!display_mode.format) {
display_mode.format = display->current_mode.format;
}
if (!display_mode.w) {
display_mode.w = display->current_mode.w;
}
if (!display_mode.h) {
display_mode.h = display->current_mode.h;
}
if (!display_mode.refresh_rate) {
display_mode.refresh_rate = display->current_mode.refresh_rate;
}
/* Get a good video mode, the closest one possible */
if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
SDL_SetError("No video mode large enough for %dx%d",
display_mode.w, display_mode.h);
return -1;
}
/* See if there's anything left to do */
SDL_GetCurrentDisplayMode(¤t_mode);
if (SDL_memcmp(&display_mode, ¤t_mode, sizeof(display_mode)) == 0) {
return 0;
}
/* Actually change the display mode */
if (_this->SetDisplayMode(_this, &display_mode) < 0) {
return -1;
}
display->current_mode = display_mode;
/* Set up a palette, if necessary */
if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
} else {
ncolors = 0;
}
if ((!ncolors && display->palette) || (ncolors && !display->palette)
|| (ncolors && ncolors != display->palette->ncolors)) {
if (display->palette) {
SDL_FreePalette(display->palette);
display->palette = NULL;
}
if (ncolors) {
display->palette = SDL_AllocPalette(ncolors);
if (!display->palette) {
return -1;
}
SDL_DitherColors(display->palette->colors,
SDL_BITSPERPIXEL(display_mode.format));
}
}
/* Move any fullscreen windows into position */
for (i = 0; i < display->num_windows; ++i) {
SDL_Window *window = &display->windows[i];
if (FULLSCREEN_VISIBLE(window)) {
SDL_SetWindowPosition(window->id, SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED);
}
}
return 0;
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}
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int
SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
{
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SDL_VideoDisplay *display;
SDL_DisplayMode fullscreen_mode;
int i;
if (!_this) {
SDL_UninitializedVideo();
return -1;
}
display = &SDL_CurrentDisplay;
if (!mode) {
mode = &display->desktop_mode;
}
SDL_GetClosestDisplayMode(mode, &fullscreen_mode);
if (SDL_memcmp
(&fullscreen_mode, &display->fullscreen_mode,
sizeof(fullscreen_mode)) == 0) {
/* Nothing to do... */
return 0;
}
display->fullscreen_mode = fullscreen_mode;
/* Actually set the mode if we have a fullscreen window visible */
for (i = 0; i < display->num_windows; ++i) {
SDL_Window *window = &display->windows[i];
if (FULLSCREEN_VISIBLE(window)) {
if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
return -1;
}
}
if (window->flags & SDL_WINDOW_FULLSCREEN) {
SDL_OnWindowResized(window);
}
}
return 0;
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}
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int
SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
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{
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if (!_this) {
SDL_UninitializedVideo();
return -1;
}
if (mode) {
*mode = SDL_CurrentDisplay.fullscreen_mode;
}
return 0;
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}
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int
SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
{
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SDL_Palette *palette;
int status = 0;
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if (!_this) {
SDL_UninitializedVideo();
return -1;
}
palette = SDL_CurrentDisplay.palette;
if (!palette) {
SDL_SetError("Display mode does not have a palette");
return -1;
}
status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);
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if (_this->SetDisplayPalette) {
if (_this->SetDisplayPalette(_this, palette) < 0) {
status = -1;
}
}
return status;
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}
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int
SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
{
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SDL_Palette *palette;
if (!_this) {
SDL_UninitializedVideo();
return -1;
}
palette = SDL_CurrentDisplay.palette;
if (!palette->ncolors) {
SDL_SetError("Display mode does not have a palette");
return -1;
}
if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
SDL_SetError("Palette indices are out of range");
return -1;
}
SDL_memcpy(colors, &palette->colors[firstcolor],
ncolors * sizeof(*colors));
return 0;
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}
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SDL_WindowID
SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
{
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const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
SDL_WINDOW_OPENGL |
SDL_WINDOW_BORDERLESS |
SDL_WINDOW_RESIZABLE);
SDL_VideoDisplay *display;
SDL_Window window;
int num_windows;
SDL_Window *windows;
if (!_this) {
SDL_UninitializedVideo();
return 0;
}
if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
SDL_SetError("No OpenGL support in video driver");
return 0;
}
/* Fullscreen windows don't have any window decorations */
if (flags & SDL_WINDOW_FULLSCREEN) {
flags |= SDL_WINDOW_BORDERLESS;
flags &= ~SDL_WINDOW_RESIZABLE;
}
SDL_zero(window);
window.id = _this->next_object_id++;
window.x = x;
window.y = y;
window.w = w;
window.h = h;
window.flags = (flags & allowed_flags);
window.display = _this->current_display;
if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
return 0;
}
display = &SDL_CurrentDisplay;
num_windows = display->num_windows;
windows =
SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
if (!windows) {
if (_this->DestroyWindow) {
_this->DestroyWindow(_this, &window);
}
return 0;
}
windows[num_windows] = window;
display->windows = windows;
display->num_windows++;
if (title) {
SDL_SetWindowTitle(window.id, title);
}
if (flags & SDL_WINDOW_MAXIMIZED) {
SDL_MaximizeWindow(window.id);
}
if (flags & SDL_WINDOW_MINIMIZED) {
SDL_MinimizeWindow(window.id);
}
if (flags & SDL_WINDOW_SHOWN) {
SDL_ShowWindow(window.id);
}
if (flags & SDL_WINDOW_INPUT_GRABBED) {
SDL_SetWindowGrab(window.id, 1);
}
return window.id;
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}
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SDL_WindowID
SDL_CreateWindowFrom(const void *data)
{
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SDL_VideoDisplay *display;
SDL_Window window;
int num_windows;
SDL_Window *windows;
if (!_this) {
SDL_UninitializedVideo();
return (0);
}
SDL_zero(window);
window.id = _this->next_object_id++;
window.display = _this->current_display;
if (!_this->CreateWindowFrom ||
_this->CreateWindowFrom(_this, &window, data) < 0) {
return 0;
}
display = &SDL_CurrentDisplay;
num_windows = display->num_windows;
windows =
SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
if (!windows) {
if (_this->DestroyWindow) {
_this->DestroyWindow(_this, &window);
}
if (window.title) {
SDL_free(window.title);
}
return 0;
}
windows[num_windows] = window;
display->windows = windows;
display->num_windows++;
return window.id;
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}
846
int
847
SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
848
{
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char *title = window->title;
if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
SDL_SetError("No OpenGL support in video driver");
return -1;
}
if (_this->DestroyWindow) {
_this->DestroyWindow(_this, window);
}
window->title = NULL;
window->flags =
(flags &
~(SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED | SDL_WINDOW_SHOWN |
SDL_WINDOW_INPUT_GRABBED));
if (_this->CreateWindow && _this->CreateWindow(_this, window) < 0) {
return -1;
}
if (title) {
SDL_SetWindowTitle(window->id, title);
SDL_free(title);
}
if (flags & SDL_WINDOW_MAXIMIZED) {
SDL_MaximizeWindow(window->id);
}
if (flags & SDL_WINDOW_MINIMIZED) {
SDL_MinimizeWindow(window->id);
}
if (flags & SDL_WINDOW_SHOWN) {
SDL_ShowWindow(window->id);
}
if (flags & SDL_WINDOW_INPUT_GRABBED) {
SDL_SetWindowGrab(window->id, 1);
}
return 0;
}
SDL_Window *
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SDL_GetWindowFromID(SDL_WindowID windowID)
{
889
int i, j;
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if (!_this) {
SDL_UninitializedVideo();
return NULL;
}
for (i = 0; i < _this->num_displays; ++i) {
SDL_VideoDisplay *display = &_this->displays[i];
for (j = 0; j < display->num_windows; ++j) {
SDL_Window *window = &display->windows[j];
if (window->id == windowID) {
return window;
}
}
}
return NULL;
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}
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SDL_VideoDisplay *
SDL_GetDisplayFromWindow(SDL_Window * window)
{
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if (!_this) {
SDL_UninitializedVideo();
return NULL;
}
if (!window) {
return NULL;
}
return &_this->displays[window->display];
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}
920
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922
Uint32
SDL_GetWindowFlags(SDL_WindowID windowID)
{
923
SDL_Window *window = SDL_GetWindowFromID(windowID);
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if (!window) {
return 0;
}
return window->flags;
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930
}
931
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void
SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
{
934
SDL_Window *window = SDL_GetWindowFromID(windowID);
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if (!window || title == window->title) {
return;
}
if (window->title) {
SDL_free(window->title);
}
if (title) {
window->title = SDL_strdup(title);
} else {
window->title = NULL;
}
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if (_this->SetWindowTitle) {
_this->SetWindowTitle(_this, window);
}
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}
953
const char *
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SDL_GetWindowTitle(SDL_WindowID windowID)
{
956
SDL_Window *window = SDL_GetWindowFromID(windowID);
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if (!window) {
return NULL;
}
return window->title;
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}
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void
SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
{
967
SDL_Window *window = SDL_GetWindowFromID(windowID);
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if (!window) {
return;
}
window->userdata = userdata;
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}
975
void *
976
SDL_GetWindowData(SDL_WindowID windowID)
977
{
978
SDL_Window *window = SDL_GetWindowFromID(windowID);
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983
if (!window) {
return NULL;
}
return window->userdata;
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985
}
986
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988
void
SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
{
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SDL_Window *window = SDL_GetWindowFromID(windowID);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
if (!window) {
return;
}
if (x == SDL_WINDOWPOS_CENTERED) {
window->x = (display->current_mode.w - window->w) / 2;
} else if (x != SDL_WINDOWPOS_UNDEFINED) {
window->x = x;
}
if (y == SDL_WINDOWPOS_CENTERED) {