Atlas - testshape.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2025 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#include <SDL3/SDL.h>
13#include <SDL3/SDL_main.h>
14
15#include "glass.h"
16
17
18static SDL_HitTestResult SDLCALL ShapeHitTest(SDL_Window *window, const SDL_Point *area, void *userdata)
19{
20    SDL_Surface *shape = (SDL_Surface *)userdata;
21    Uint8 r, g, b, a;
22
23    if (SDL_ReadSurfacePixel(shape, area->x, area->y, &r, &g, &b, &a)) {
24        if (a != SDL_ALPHA_TRANSPARENT) {
25            /* We'll just make everything draggable */
26            return SDL_HITTEST_DRAGGABLE;
27        }
28    }
29    return SDL_HITTEST_NORMAL;
30}
31
32int main(int argc, char *argv[])
33{
34    const char *image_file = NULL;
35    SDL_Window *window = NULL;
36    SDL_Renderer *renderer = NULL;
37    SDL_Surface *shape = NULL;
38    bool resizable = false;
39    SDL_WindowFlags flags;
40    bool done = false;
41    SDL_Event event;
42    int i;
43    int return_code = 1;
44
45    for (i = 1; i < argc; ++i) {
46        if (SDL_strcmp(argv[i], "--resizable") == 0) {
47            resizable = true;
48        } else if (!image_file) {
49            image_file = argv[i];
50        } else {
51            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Usage: %s [--resizable] [shape.png]", argv[0]);
52            goto quit;
53        }
54    }
55
56    if (image_file) {
57        shape = SDL_LoadSurface(image_file);
58        if (!shape) {
59            SDL_Log("Couldn't load %s: %s", image_file, SDL_GetError());
60            goto quit;
61        }
62    } else {
63        SDL_IOStream *stream = SDL_IOFromConstMem(glass_png, sizeof(glass_png));
64        if (!stream) {
65            SDL_Log("Couldn't create iostream for glass.png: %s", SDL_GetError());
66            goto quit;
67        }
68        shape = SDL_LoadPNG_IO(stream, true);
69        if (!shape) {
70            SDL_Log("Couldn't load glass.png: %s", SDL_GetError());
71            goto quit;
72        }
73    }
74
75    /* Create the window hidden so we can set the shape before it's visible */
76    flags = (SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
77    if (resizable) {
78        flags |= SDL_WINDOW_RESIZABLE;
79    } else {
80        flags |= SDL_WINDOW_BORDERLESS;
81    }
82    window = SDL_CreateWindow("SDL Shape Test", shape->w, shape->h, flags);
83    if (!window) {
84        SDL_Log("Couldn't create transparent window: %s", SDL_GetError());
85        goto quit;
86    }
87
88    renderer = SDL_CreateRenderer(window, NULL);
89    if (!renderer) {
90        SDL_Log("Couldn't create renderer: %s", SDL_GetError());
91        goto quit;
92    }
93
94    if (!SDL_ISPIXELFORMAT_ALPHA(shape->format)) {
95        /* Set the colorkey to the top-left pixel */
96        Uint8 r, g, b, a;
97
98        SDL_ReadSurfacePixel(shape, 0, 0, &r, &g, &b, &a);
99        SDL_SetSurfaceColorKey(shape, 1, SDL_MapSurfaceRGBA(shape, r, g, b, a));
100    }
101
102    if (!resizable) {
103        /* Set the hit test callback so we can drag the window */
104        if (!SDL_SetWindowHitTest(window, ShapeHitTest, shape)) {
105            SDL_Log("Couldn't set hit test callback: %s", SDL_GetError());
106            goto quit;
107        }
108    }
109
110    /* Set the window size to the size of our shape and show it */
111    SDL_SetWindowShape(window, shape);
112    SDL_ShowWindow(window);
113
114    /* We're ready to go! */
115    while (!done) {
116        while (SDL_PollEvent(&event)) {
117            switch (event.type) {
118            case SDL_EVENT_KEY_DOWN:
119                if (event.key.key == SDLK_ESCAPE) {
120                    done = true;
121                }
122                break;
123            case SDL_EVENT_QUIT:
124                done = true;
125                break;
126            default:
127                break;
128            }
129        }
130
131        /* We'll clear to white, but you could do other drawing here */
132        SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
133        SDL_RenderClear(renderer);
134
135        /* Show everything on the screen and wait a bit */
136        SDL_RenderPresent(renderer);
137        SDL_Delay(100);
138    }
139
140    /* Success! */
141    return_code = 0;
142
143quit:
144    SDL_DestroySurface(shape);
145    SDL_Quit();
146    return return_code;
147}
148
[FILE END]
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