Atlas - testdisplayinfo.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
20static void
21print_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
31int
32main(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
97
[FILE END]
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