test/testdisplayinfo.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 01 Jan 2017 18:33:28 -0800
changeset 10737 3406a0f8b041
parent 10038 2bab6f8d403e
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Updated copyright for 2017
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/*
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  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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/* Program to test querying of display info */
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#include "SDL.h"
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#include <stdio.h>
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#include <stdlib.h>
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static void
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print_mode(const char *prefix, const SDL_DisplayMode *mode)
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{
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    if (!mode)
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        return;
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    SDL_Log("%s: fmt=%s w=%d h=%d refresh=%d\n",
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            prefix, SDL_GetPixelFormatName(mode->format),
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            mode->w, mode->h, mode->refresh_rate);
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}
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int
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main(int argc, char *argv[])
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{
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    SDL_DisplayMode mode;
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    int num_displays, dpy;
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    /* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Load the SDL library */
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return 1;
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    }
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    SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
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    num_displays = SDL_GetNumVideoDisplays();
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    SDL_Log("See %d displays.\n", num_displays);
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    for (dpy = 0; dpy < num_displays; dpy++) {
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        const int num_modes = SDL_GetNumDisplayModes(dpy);
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        SDL_Rect rect = { 0, 0, 0, 0 };
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        float ddpi, hdpi, vdpi;
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        int m;
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        SDL_GetDisplayBounds(dpy, &rect);
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        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);
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        if (SDL_GetDisplayDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DPI: failed to query (%s)\n", SDL_GetError());
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        } else {
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            SDL_Log("    DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
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        }
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        if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    CURRENT: failed to query (%s)\n", SDL_GetError());
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        } else {
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            print_mode("CURRENT", &mode);
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        }
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        if (SDL_GetDesktopDisplayMode(dpy, &mode) == -1) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DESKTOP: failed to query (%s)\n", SDL_GetError());
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        } else {
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            print_mode("DESKTOP", &mode);
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        }
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        for (m = 0; m < num_modes; m++) {
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            if (SDL_GetDisplayMode(dpy, m, &mode) == -1) {
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                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    MODE %d: failed to query (%s)\n", m, SDL_GetError());
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            } else {
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                char prefix[64];
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                SDL_snprintf(prefix, sizeof (prefix), "    MODE %d", m);
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                print_mode(prefix, &mode);
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            }
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        }
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        SDL_Log("\n");
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    }
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    SDL_Quit();
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    return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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