SDL  2.0
testdisplayinfo.c File Reference
#include "SDL.h"
#include <stdio.h>
#include <stdlib.h>
+ Include dependency graph for testdisplayinfo.c:

Go to the source code of this file.

Functions

static void print_mode (const char *prefix, const SDL_DisplayMode *mode)
 
int main (int argc, char *argv[])
 

Function Documentation

◆ main()

int main ( int  argc,
char *  argv[] 
)

Definition at line 32 of file testdisplayinfo.c.

References dpy, SDL_Rect::h, print_mode(), rect, SDL_GetCurrentDisplayMode, SDL_GetCurrentVideoDriver, SDL_GetDesktopDisplayMode, SDL_GetDisplayBounds, SDL_GetDisplayDPI, SDL_GetDisplayMode, SDL_GetDisplayName, SDL_GetError, SDL_GetNumDisplayModes, SDL_GetNumVideoDisplays, SDL_Init, SDL_INIT_VIDEO, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_Quit, SDL_snprintf, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

33 {
35  int num_displays, dpy;
36 
37  /* Enable standard application logging */
39 
40  /* Load the SDL library */
41  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
42  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
43  return 1;
44  }
45 
46  SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
47  num_displays = SDL_GetNumVideoDisplays();
48 
49  SDL_Log("See %d displays.\n", num_displays);
50 
51  for (dpy = 0; dpy < num_displays; dpy++) {
52  const int num_modes = SDL_GetNumDisplayModes(dpy);
53  SDL_Rect rect = { 0, 0, 0, 0 };
54  float ddpi, hdpi, vdpi;
55  int m;
56 
57  SDL_GetDisplayBounds(dpy, &rect);
58  SDL_Log("%d: \"%s\" (%dx%d, (%d, %d)), %d modes.\n", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, num_modes);
59 
60  if (SDL_GetDisplayDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
61  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DPI: failed to query (%s)\n", SDL_GetError());
62  } else {
63  SDL_Log(" DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
64  }
65 
66  if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
67  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " CURRENT: failed to query (%s)\n", SDL_GetError());
68  } else {
69  print_mode("CURRENT", &mode);
70  }
71 
72  if (SDL_GetDesktopDisplayMode(dpy, &mode) == -1) {
73  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DESKTOP: failed to query (%s)\n", SDL_GetError());
74  } else {
75  print_mode("DESKTOP", &mode);
76  }
77 
78  for (m = 0; m < num_modes; m++) {
79  if (SDL_GetDisplayMode(dpy, m, &mode) == -1) {
80  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " MODE %d: failed to query (%s)\n", m, SDL_GetError());
81  } else {
82  char prefix[64];
83  SDL_snprintf(prefix, sizeof (prefix), " MODE %d", m);
84  print_mode(prefix, &mode);
85  }
86  }
87 
88  SDL_Log("\n");
89  }
90 
91  SDL_Quit();
92  return 0;
93 }
#define SDL_GetError
static void print_mode(const char *prefix, const SDL_DisplayMode *mode)
#define SDL_GetDisplayMode
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display dpy)
Definition: SDL_x11sym.h:44
SDL_Rect rect
Definition: testrelative.c:27
const GLfloat * m
#define SDL_GetDesktopDisplayMode
#define SDL_GetDisplayName
The structure that defines a display mode.
Definition: SDL_video.h:53
#define SDL_LogError
#define SDL_GetNumVideoDisplays
#define SDL_Log
#define SDL_Quit
GLenum mode
#define SDL_GetDisplayBounds
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
#define SDL_LogSetPriority
#define SDL_GetCurrentVideoDriver
int h
Definition: SDL_rect.h:67
#define SDL_GetDisplayDPI
#define SDL_snprintf
#define SDL_Init
#define SDL_GetNumDisplayModes
#define SDL_GetCurrentDisplayMode
int y
Definition: SDL_rect.h:66
#define SDL_INIT_VIDEO
Definition: SDL.h:78
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ print_mode()

static void print_mode ( const char *  prefix,
const SDL_DisplayMode mode 
)
static

Definition at line 21 of file testdisplayinfo.c.

References SDL_DisplayMode::format, SDL_DisplayMode::h, SDL_DisplayMode::refresh_rate, SDL_GetPixelFormatName, SDL_Log, and SDL_DisplayMode::w.

Referenced by main().

22 {
23  if (!mode)
24  return;
25 
26  SDL_Log("%s: fmt=%s w=%d h=%d refresh=%d\n",
27  prefix, SDL_GetPixelFormatName(mode->format),
28  mode->w, mode->h, mode->refresh_rate);
29 }
#define SDL_Log
Uint32 format
Definition: SDL_video.h:55
#define SDL_GetPixelFormatName