test/testdisplayinfo.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 08 Jun 2017 13:27:58 -0400
changeset 11081 eea7f98a37e4
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
jack: Initial shot at a JACK audio target.

http://jackaudio.org/

Fixes Bugzilla #2163.
(with several more commits following to improve this code.)
     1 /*
     2   Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
     3 
     4   This software is provided 'as-is', without any express or implied
     5   warranty.  In no event will the authors be held liable for any damages
     6   arising from the use of this software.
     7 
     8   Permission is granted to anyone to use this software for any purpose,
     9   including commercial applications, and to alter it and redistribute it
    10   freely.
    11 */
    12 
    13 /* Program to test querying of display info */
    14 
    15 #include "SDL.h"
    16 
    17 #include <stdio.h>
    18 #include <stdlib.h>
    19 
    20 static void
    21 print_mode(const char *prefix, const SDL_DisplayMode *mode)
    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 }
    30 
    31 int
    32 main(int argc, char *argv[])
    33 {
    34     SDL_DisplayMode mode;
    35     int num_displays, dpy;
    36 
    37     /* Enable standard application logging */
    38     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    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 }
    94 
    95 /* vi: set ts=4 sw=4 expandtab: */
    96