我在哪里可以找到“SDL_Window"的定义 [英] Where can I find the definition of 'SDL_Window'

问题描述

我刚刚开始在 Linux 中学习 SDL2.我正在阅读 LazyFoo 的第一个教程，我看到有该代码:

I've just started learning SDL2 in Linux. I am reading the very first tutorial from LazyFoo and I see have that code:

//The window we'll be rendering to 
SDL_Window* window = NULL;

我在哪里可以找到 SDL_Window 的定义以便阅读它?

Where can I find the definition of SDL_Window in order to read about it ?

推荐答案

这个结构不暴露给用户端；SDL_video.h 文件包含它的前向声明:

This structure isn't exposed to user side; SDL_video.h file contains forward declaration of it:

typedef struct SDL_Window SDL_Window;

前向声明意味着您只能将其用作指针类型，因为实际数据布局对您是隐藏的.

Forward declaration means you can only use it as pointer type because actual data layout is hidden from you.

实际类型 struct SDL_Window 当前在 src/video/SDL_sysvideo.h(在 SDL 源代码:，不在开发库:"中:

Actual type struct SDL_Window is currently declared in src/video/SDL_sysvideo.h (in SDL Source Code:, not in 'Development Libraries:') as:

struct SDL_Window
{
    const void *magic;
    Uint32 id;
    char *title;
    SDL_Surface *icon;
    int x, y;
    int w, h;
    int min_w, min_h;
    int max_w, max_h;
    Uint32 flags;
    Uint32 last_fullscreen_flags;

    /* Stored position and size for windowed mode */
    SDL_Rect windowed;

    SDL_DisplayMode fullscreen_mode;

    float brightness;
    Uint16 *gamma;
    Uint16 *saved_gamma;        /* (just offset into gamma) */

    SDL_Surface *surface;
    SDL_bool surface_valid;

    SDL_bool is_hiding;
    SDL_bool is_destroying;

    SDL_WindowShaper *shaper;

    SDL_HitTest hit_test;
    void *hit_test_data;

    SDL_WindowUserData *data;

    void *driverdata;

    SDL_Window *prev;
    SDL_Window *next;
};

但是，如果您不是在开发/调试 SDL，则此信息几乎没有用处，而且最重要的是，可能会在任何未来版本中更改.同样最有趣的部分 - 指向 SDL_WindowUserData 的指针 - 是特定于平台的，并且因不同的操作系统和 SDL 视频驱动程序而异.

However, if you're not developing/debugging SDL, this information is pretty much useless, and, most importantly, can change in any future release. Also most interesting part - pointer to SDL_WindowUserData - is platform-specific and varies between different OSes and SDL videodrivers.

您应该改用 SDL2 视频 API.

You should use SDL2 video API instead.

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