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SDL_video.c
2508 lines (2209 loc) · 62.7 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 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 */
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#include "SDL.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_pixels_c.h"
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#include "../events/SDL_events_c.h"
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#if SDL_VIDEO_OPENGL
#include "SDL_opengl.h"
#endif /* SDL_VIDEO_OPENGL */
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#if SDL_VIDEO_OPENGL_ES
#include "SDL_opengles.h"
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#endif /* SDL_VIDEO_OPENGL_ES */
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#if SDL_VIDEO_OPENGL_ES2
#include "SDL_opengles2.h"
#endif /* SDL_VIDEO_OPENGL_ES2 */
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#include "SDL_syswm.h"
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/* On Windows, windows.h defines CreateWindow */
#ifdef CreateWindow
#undef CreateWindow
#endif
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/* Available video drivers */
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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_DIRECTFB
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&DirectFB_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_WINDOWS
&WINDOWS_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_PANDORA
&PND_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
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&UIKIT_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_ANDROID
&Android_bootstrap,
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#endif
#if SDL_VIDEO_DRIVER_DUMMY
&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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#define CHECK_WINDOW_MAGIC(window, retval) \
if (!_this) { \
SDL_UninitializedVideo(); \
return retval; \
} \
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if (!window || window->magic != &_this->window_magic) { \
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SDL_SetError("Invalid window"); \
return retval; \
}
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#define CHECK_DISPLAY_INDEX(displayIndex, retval) \
if (!_this) { \
SDL_UninitializedVideo(); \
return retval; \
} \
if (displayIndex < 0 || displayIndex >= _this->num_displays) { \
SDL_SetError("displayIndex must be in the range 0 - %d", \
_this->num_displays - 1); \
return retval; \
}
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/* Various local functions */
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static void SDL_UpdateWindowGrab(SDL_Window * window);
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/* Support for framebuffer emulation using an accelerated renderer */
#define SDL_WINDOWTEXTUREDATA "_SDL_WindowTextureData"
typedef struct {
SDL_Renderer *renderer;
SDL_Texture *texture;
void *pixels;
int pitch;
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int bytes_per_pixel;
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} SDL_WindowTextureData;
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static SDL_bool
ShouldUseTextureFramebuffer()
{
const char *hint;
/* If there's no native framebuffer support then there's no option */
if (!_this->CreateWindowFramebuffer) {
return SDL_TRUE;
}
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/* If the user has specified a software renderer we can't use a
texture framebuffer, or renderer creation will go recursive.
*/
hint = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
if (hint && SDL_strcasecmp(hint, "software") == 0) {
return SDL_FALSE;
}
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/* See if the user or application wants a specific behavior */
hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
if (hint) {
if (*hint == '0') {
return SDL_FALSE;
} else {
return SDL_TRUE;
}
}
/* Each platform has different performance characteristics */
#if defined(__WIN32__)
/* GDI BitBlt() is way faster than Direct3D dynamic textures right now.
*/
return SDL_FALSE;
#elif defined(__MACOSX__)
/* Mac OS X uses OpenGL as the native fast path */
return SDL_TRUE;
#elif defined(__LINUX__)
/* Properly configured OpenGL drivers are faster than MIT-SHM */
#if SDL_VIDEO_OPENGL
/* Ugh, find a way to cache this value! */
{
SDL_Window *window;
SDL_GLContext context;
SDL_bool hasAcceleratedOpenGL = SDL_FALSE;
window = SDL_CreateWindow("OpenGL test", -32, -32, 32, 32, SDL_WINDOW_OPENGL);
if (window) {
context = SDL_GL_CreateContext(window);
if (context) {
const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
const char *vendor = NULL;
glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
if (glGetStringFunc) {
vendor = (const char *) glGetStringFunc(GL_VENDOR);
}
/* Add more vendors here at will... */
if (vendor &&
(SDL_strstr(vendor, "ATI Technologies") ||
SDL_strstr(vendor, "NVIDIA"))) {
hasAcceleratedOpenGL = SDL_TRUE;
}
SDL_GL_DeleteContext(context);
}
SDL_DestroyWindow(window);
}
return hasAcceleratedOpenGL;
}
#else
return SDL_FALSE;
#endif
#else
/* Play it safe, assume that if there is a framebuffer driver that it's
optimized for the current platform.
*/
return SDL_FALSE;
#endif
}
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static int
SDL_CreateWindowTexture(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
{
SDL_WindowTextureData *data;
SDL_Renderer *renderer;
SDL_RendererInfo info;
Uint32 i;
data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
if (!data) {
data = (SDL_WindowTextureData *)SDL_calloc(1, sizeof(*data));
if (!data) {
SDL_OutOfMemory();
return -1;
}
SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, data);
}
renderer = data->renderer;
if (!renderer) {
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SDL_RendererInfo info;
int i;
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const char *hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);
/* Check to see if there's a specific driver requested */
if (hint && *hint != '0' && *hint != '1' &&
SDL_strcasecmp(hint, "software") != 0) {
for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
SDL_GetRenderDriverInfo(i, &info);
if (SDL_strcasecmp(info.name, hint) == 0) {
renderer = SDL_CreateRenderer(window, i, 0);
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break;
}
}
}
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if (!renderer) {
for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
SDL_GetRenderDriverInfo(i, &info);
if (SDL_strcmp(info.name, "software") != 0) {
renderer = SDL_CreateRenderer(window, i, 0);
if (renderer) {
break;
}
}
}
}
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if (!renderer) {
return -1;
}
data->renderer = renderer;
}
/* Free any old texture and pixel data */
if (data->texture) {
SDL_DestroyTexture(data->texture);
data->texture = NULL;
}
if (data->pixels) {
SDL_free(data->pixels);
data->pixels = NULL;
}
if (SDL_GetRendererInfo(renderer, &info) < 0) {
return -1;
}
/* Find the first format without an alpha channel */
*format = info.texture_formats[0];
for (i = 0; i < info.num_texture_formats; ++i) {
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if (!SDL_ISPIXELFORMAT_FOURCC(info.texture_formats[i]) &&
!SDL_ISPIXELFORMAT_ALPHA(info.texture_formats[i])) {
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*format = info.texture_formats[i];
break;
}
}
data->texture = SDL_CreateTexture(renderer, *format,
SDL_TEXTUREACCESS_STREAMING,
window->w, window->h);
if (!data->texture) {
return -1;
}
/* Create framebuffer data */
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data->bytes_per_pixel = SDL_BYTESPERPIXEL(*format);
data->pitch = (((window->w * data->bytes_per_pixel) + 3) & ~3);
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data->pixels = SDL_malloc(window->h * data->pitch);
if (!data->pixels) {
SDL_OutOfMemory();
return -1;
}
*pixels = data->pixels;
*pitch = data->pitch;
return 0;
}
static int
SDL_UpdateWindowTexture(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects)
{
SDL_WindowTextureData *data;
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#ifdef UPDATE_TEXTURE_SUBRECTS
void *src, *dst;
int src_pitch;
int dst_pitch;
int i, row, length;
#endif
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data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
if (!data || !data->texture) {
SDL_SetError("No window texture data");
return -1;
}
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#ifdef UPDATE_TEXTURE_SUBRECTS
src_pitch = data->pitch;
for (i = 0; i < numrects; ++i) {
src = (void *)((Uint8 *)data->pixels +
rects[i].y * src_pitch +
rects[i].x * data->bytes_per_pixel);
if (SDL_LockTexture(data->texture, &rects[i], &dst, &dst_pitch) < 0) {
return -1;
}
length = rects[i].w * data->bytes_per_pixel;
for (row = rects[i].h; row--; ) {
SDL_memcpy(dst, src, length);
src = (Uint8*)src + src_pitch;
dst = (Uint8*)dst + dst_pitch;
}
SDL_UnlockTexture(data->texture);
}
#else
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if (SDL_UpdateTexture(data->texture, NULL, data->pixels, data->pitch) < 0) {
return -1;
}
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#endif
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if (SDL_RenderCopy(data->renderer, data->texture, NULL, NULL) < 0) {
return -1;
}
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SDL_RenderPresent(data->renderer);
return 0;
}
static void
SDL_DestroyWindowTexture(_THIS, SDL_Window * window)
{
SDL_WindowTextureData *data;
data = SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, NULL);
if (!data) {
return;
}
if (data->texture) {
SDL_DestroyTexture(data->texture);
}
if (data->renderer) {
SDL_DestroyRenderer(data->renderer);
}
if (data->pixels) {
SDL_free(data->pixels);
}
SDL_free(data);
}
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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);
}
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if (SDL_PIXELLAYOUT(a.format) != SDL_PIXELLAYOUT(b.format)) {
return SDL_PIXELLAYOUT(b.format) - SDL_PIXELLAYOUT(a.format);
}
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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
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SDL_VideoInit(const char *driver_name)
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{
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SDL_VideoDevice *video;
int index;
int i;
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/* Check to make sure we don't overwrite '_this' */
if (_this != NULL) {
SDL_VideoQuit();
}
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/* Start the event loop */
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if (SDL_StartEventLoop() < 0 ||
SDL_KeyboardInit() < 0 ||
SDL_MouseInit() < 0 ||
SDL_TouchInit() < 0 ||
SDL_QuitInit() < 0) {
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return -1;
}
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/* 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) {
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video = bootstrap[i]->create(index);
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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;
_this->gl_config.retained_backing = 1;
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_this->gl_config.accelerated = -1; /* accelerated or not, both are fine */
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#if SDL_VIDEO_OPENGL
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_this->gl_config.major_version = 2;
_this->gl_config.minor_version = 1;
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#elif SDL_VIDEO_OPENGL_ES
_this->gl_config.major_version = 1;
_this->gl_config.minor_version = 1;
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#elif SDL_VIDEO_OPENGL_ES2
_this->gl_config.major_version = 2;
_this->gl_config.minor_version = 0;
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#endif
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/* Initialize the video subsystem */
if (_this->VideoInit(_this) < 0) {
SDL_VideoQuit();
return -1;
}
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/* 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);
}
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/* Add the renderer framebuffer emulation if desired */
if (ShouldUseTextureFramebuffer()) {
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_this->CreateWindowFramebuffer = SDL_CreateWindowTexture;
_this->UpdateWindowFramebuffer = SDL_UpdateWindowTexture;
_this->DestroyWindowFramebuffer = SDL_DestroyWindowTexture;
}
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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 *
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SDL_GetVideoDevice(void)
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{
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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
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SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect)
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{
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CHECK_DISPLAY_INDEX(displayIndex, -1);
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if (rect) {
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SDL_VideoDisplay *display = &_this->displays[displayIndex];
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if (_this->GetDisplayBounds) {
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if (_this->GetDisplayBounds(_this, display, rect) == 0) {
return 0;
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}
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}
/* Assume that the displays are left to right */
if (displayIndex == 0) {
rect->x = 0;
rect->y = 0;
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} else {
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SDL_GetDisplayBounds(displayIndex-1, rect);
rect->x += rect->w;
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}
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rect->w = display->desktop_mode.w;
rect->h = display->desktop_mode.h;
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}
return 0;
}
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SDL_bool
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SDL_AddDisplayMode(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
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{
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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++;
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/* Re-sort video modes */
SDL_qsort(display->display_modes, display->num_display_modes,
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sizeof(SDL_DisplayMode), cmpmodes);
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return SDL_TRUE;
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}
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SDL_VideoDisplay *
SDL_GetFirstDisplay(void)
{
return &_this->displays[0];
}
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static int
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SDL_GetNumDisplayModesForDisplay(SDL_VideoDisplay * display)
{
if (!display->num_display_modes && _this->GetDisplayModes) {
_this->GetDisplayModes(_this, display);
SDL_qsort(display->display_modes, display->num_display_modes,
sizeof(SDL_DisplayMode), cmpmodes);
}
return display->num_display_modes;
}
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int
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SDL_GetNumDisplayModes(int displayIndex)
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{
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CHECK_DISPLAY_INDEX(displayIndex, -1);
return SDL_GetNumDisplayModesForDisplay(&_this->displays[displayIndex]);
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}
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int
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SDL_GetDisplayMode(int displayIndex, int index, SDL_DisplayMode * mode)
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{
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SDL_VideoDisplay *display;
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
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if (index < 0 || index >= SDL_GetNumDisplayModesForDisplay(display)) {
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SDL_SetError("index must be in the range of 0 - %d",
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SDL_GetNumDisplayModesForDisplay(display) - 1);
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return -1;
}
if (mode) {
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*mode = display->display_modes[index];
}
return 0;
}
int
704
SDL_GetDesktopDisplayMode(int displayIndex, SDL_DisplayMode * mode)
705
{
706
SDL_VideoDisplay *display;
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708
709
710
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
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712
if (mode) {
*mode = display->desktop_mode;
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714
}
return 0;
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716
}
717
int
718
SDL_GetCurrentDisplayMode(int displayIndex, SDL_DisplayMode * mode)
719
{
720
SDL_VideoDisplay *display;
721
722
723
724
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
725
if (mode) {
726
*mode = display->current_mode;
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728
}
return 0;
729
}
730
731
static SDL_DisplayMode *
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733
734
SDL_GetClosestDisplayModeForDisplay(SDL_VideoDisplay * display,
const SDL_DisplayMode * mode,
SDL_DisplayMode * closest)
735
736
737
738
739
740
{
Uint32 target_format;
int target_refresh_rate;
int i;
SDL_DisplayMode *current, *match;
741
742
if (!mode || !closest) {
SDL_SetError("Missing desired mode or closest mode parameter");
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744
return NULL;
}
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746
747
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749
/* Default to the desktop format */
if (mode->format) {
target_format = mode->format;
} else {
750
target_format = display->desktop_mode.format;
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754
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756
}
/* Default to the desktop refresh rate */
if (mode->refresh_rate) {
target_refresh_rate = mode->refresh_rate;
} else {
757
target_refresh_rate = display->desktop_mode.refresh_rate;
758
759
760
}
match = NULL;
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for (i = 0; i < SDL_GetNumDisplayModesForDisplay(display); ++i) {
current = &display->display_modes[i];
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764
if (current->w && (current->w < mode->w)) {
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767
/* Out of sorted modes large enough here */
break;
}
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770
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if (current->h && (current->h < mode->h)) {
if (current->w && (current->w == mode->w)) {
/* Out of sorted modes large enough here */
break;
}
/* Wider, but not tall enough, due to a different
aspect ratio. This mode must be skipped, but closer
modes may still follow. */
continue;
}
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791
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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;
836
}
837
838
SDL_DisplayMode *
839
840
SDL_GetClosestDisplayMode(int displayIndex,
const SDL_DisplayMode * mode,
841
842
SDL_DisplayMode * closest)
{
843
844
845
846
847
848
SDL_VideoDisplay *display;
CHECK_DISPLAY_INDEX(displayIndex, NULL);
display = &_this->displays[displayIndex];
return SDL_GetClosestDisplayModeForDisplay(display, mode, closest);
849
850
}
851
int
852
SDL_SetDisplayModeForDisplay(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
853
{
854
855
856
SDL_DisplayMode display_mode;
SDL_DisplayMode current_mode;
857
858
if (mode) {
display_mode = *mode;
859
860
861
862
863
864
865
866
867
868
869
870
871
872
/* 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;
}
873
874
875
876
877
878
879
880
881
/* Get a good video mode, the closest one possible */
if (!SDL_GetClosestDisplayModeForDisplay(display, &display_mode, &display_mode)) {
SDL_SetError("No video mode large enough for %dx%d",
display_mode.w, display_mode.h);
return -1;
}
} else {
display_mode = display->desktop_mode;
882
}
883
884
/* See if there's anything left to do */
885
current_mode = display->current_mode;
886
887
888
if (SDL_memcmp(&display_mode, ¤t_mode, sizeof(display_mode)) == 0) {
return 0;
}
889
890
/* Actually change the display mode */
891
892
893
894
if (!_this->SetDisplayMode) {
SDL_SetError("Video driver doesn't support changing display mode");
return -1;
}
895
if (_this->SetDisplayMode(_this, display, &display_mode) < 0) {
896
897
898
899
return -1;
}
display->current_mode = display_mode;
return 0;
900
901
}
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
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924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
int
SDLCALL SDL_GetWindowDisplay(SDL_Window * window)
{
int displayIndex;
int i, dist;
int closest = -1;
int closest_dist = 0x7FFFFFFF;
SDL_Point center;
SDL_Point delta;
SDL_Rect rect;
CHECK_WINDOW_MAGIC(window, -1);
if (SDL_WINDOWPOS_ISUNDEFINED(window->x) ||
SDL_WINDOWPOS_ISCENTERED(window->x)) {
displayIndex = (window->x & 0xFFFF);
if (displayIndex >= _this->num_displays) {
displayIndex = 0;
}
return displayIndex;
}
if (SDL_WINDOWPOS_ISUNDEFINED(window->y) ||
SDL_WINDOWPOS_ISCENTERED(window->y)) {
displayIndex = (window->y & 0xFFFF);
if (displayIndex >= _this->num_displays) {
displayIndex = 0;
}
return displayIndex;
}
/* Find the display containing the window */
center.x = window->x + window->w / 2;
center.y = window->y + window->h / 2;
for (i = 0; i < _this->num_displays; ++i) {
SDL_VideoDisplay *display = &_this->displays[i];
SDL_GetDisplayBounds(i, &rect);
if (display->fullscreen_window == window || SDL_EnclosePoints(¢er, 1, &rect, NULL)) {
return i;
}
delta.x = center.x - (rect.x + rect.w / 2);
delta.y = center.y - (rect.y + rect.h / 2);
dist = (delta.x*delta.x + delta.y*delta.y);
if (dist < closest_dist) {
closest = i;
closest_dist = dist;
}
}
if (closest < 0) {
SDL_SetError("Couldn't find any displays");
}
return closest;
}
SDL_VideoDisplay *
SDL_GetDisplayForWindow(SDL_Window *window)
{
return &_this->displays[SDL_GetWindowDisplay(window)];
}
963
int
964
SDL_SetWindowDisplayMode(SDL_Window * window, const SDL_DisplayMode * mode)
965
{
966
CHECK_WINDOW_MAGIC(window, -1);
967
968
969
970
971
if (mode) {
window->fullscreen_mode = *mode;
} else {
SDL_zero(window->fullscreen_mode);
972
}
973
return 0;
974
975
}
976
int
977
SDL_GetWindowDisplayMode(SDL_Window * window, SDL_DisplayMode * mode)
978
{
979
980
SDL_DisplayMode fullscreen_mode;
981
CHECK_WINDOW_MAGIC(window, -1);
982
983
984
985
986
987
988
989
990
fullscreen_mode = window->fullscreen_mode;
if (!fullscreen_mode.w) {
fullscreen_mode.w = window->w;
}
if (!fullscreen_mode.h) {
fullscreen_mode.h = window->h;
}
991
if (!SDL_GetClosestDisplayModeForDisplay(SDL_GetDisplayForWindow(window),
992
993
994
995
996
997
&fullscreen_mode,
&fullscreen_mode)) {
SDL_SetError("Couldn't find display mode match");
return -1;
}
998
if (mode) {
999
*mode = fullscreen_mode;
1000
}