824b9b0a58
This function wasn't consistently correct across platforms and devices. If you want the UI scale factor, you can use display_scale in the structure returned by SDL_GetDesktopDisplayMode(). If you need an approximate DPI, you can multiply this value times 160 on iPhone and Android, and 96 on other platforms.
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*
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Copyright (C) 1997-2023 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 <stdlib.h>
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.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 == NULL) {
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return;
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}
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SDL_Log("%s: fmt=%s w=%d h=%d scale=%d%% refresh=%gHz\n",
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prefix, SDL_GetPixelFormatName(mode->format),
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mode->pixel_w, mode->pixel_h, (int)(mode->display_scale * 100.0f), mode->refresh_rate);
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}
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int main(int argc, char *argv[])
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{
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SDL_DisplayID *displays;
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const SDL_DisplayMode **modes;
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const SDL_DisplayMode *mode;
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int num_displays, i;
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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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displays = SDL_GetDisplays(&num_displays);
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SDL_Log("See %d displays.\n", num_displays);
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for (i = 0; i < num_displays; i++) {
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SDL_DisplayID dpy = displays[i];
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SDL_Rect rect = { 0, 0, 0, 0 };
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int m, num_modes = 0;
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SDL_GetDisplayBounds(dpy, &rect);
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modes = SDL_GetFullscreenDisplayModes(dpy, &num_modes);
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SDL_Log("%" SDL_PRIu32 ": \"%s\" (%dx%d, (%d, %d)), %d fullscreen modes.\n", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, num_modes);
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mode = SDL_GetCurrentDisplayMode(dpy);
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if (mode) {
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print_mode("CURRENT", mode);
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} else {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " CURRENT: failed to query (%s)\n", SDL_GetError());
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}
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mode = SDL_GetDesktopDisplayMode(dpy);
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if (mode) {
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print_mode("DESKTOP", mode);
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} else {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DESKTOP: failed to query (%s)\n", SDL_GetError());
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}
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for (m = 0; m < num_modes; m++) {
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char prefix[64];
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(void)SDL_snprintf(prefix, sizeof prefix, " MODE %d", m);
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print_mode(prefix, modes[i]);
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}
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SDL_free(modes);
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SDL_Log("\n");
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}
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SDL_free(displays);
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SDL_Quit();
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return 0;
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}
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