Atlas - testutils.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
3  Copyright 2022 Collabora Ltd.
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely.
12*/
13
14#include "testutils.h"
15
16/**
17 * Return the absolute path to def in the SDL_GetBasePath() if possible, or
18 * the relative path to def on platforms that don't have a working
19 * SDL_GetBasePath(). Free the result with SDL_free.
20 *
21 * Fails and returns NULL if out of memory.
22 */
23char *GetNearbyFilename(const char *file)
24{
25    const char *base = SDL_GetBasePath();
26    char *path;
27
28    if (base) {
29        SDL_IOStream *rw;
30
31        if (SDL_asprintf(&path, "%s%s", base, file) < 0) {
32            return NULL;
33        }
34
35        rw = SDL_IOFromFile(path, "rb");
36        if (rw) {
37            SDL_CloseIO(rw);
38            return path;
39        }
40
41        /* Couldn't find the file in the base path */
42        SDL_free(path);
43    }
44
45    return SDL_strdup(file);
46}
47
48/**
49 * If user_specified is non-NULL, return a copy of it. Free with SDL_free.
50 *
51 * Otherwise, return the absolute path to def in the SDL_GetBasePath() if
52 * possible, or the relative path to def on platforms that don't have a
53 * working SDL_GetBasePath(). Free the result with SDL_free.
54 *
55 * Fails and returns NULL if out of memory.
56 */
57char *GetResourceFilename(const char *user_specified, const char *def)
58{
59    if (user_specified) {
60        return SDL_strdup(user_specified);
61    }
62    return GetNearbyFilename(def);
63}
64
65/**
66 * Load the .png file whose name is file, from the SDL_GetBasePath() if
67 * possible or the current working directory if not.
68 *
69 * If transparent is true, set the transparent colour from the top left pixel.
70 *
71 * If width_out is non-NULL, set it to the texture width.
72 *
73 * If height_out is non-NULL, set it to the texture height.
74 */
75SDL_Texture *LoadTexture(SDL_Renderer *renderer, const char *file, bool transparent)
76{
77    SDL_Surface *temp = NULL;
78    SDL_Texture *texture = NULL;
79    char *path;
80
81    path = GetNearbyFilename(file);
82
83    if (path) {
84        file = path;
85    }
86
87    temp = SDL_LoadSurface(file);
88    if (!temp) {
89        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
90    } else {
91        /* Set transparent pixel as the pixel at (0,0) */
92        if (transparent) {
93            if (SDL_GetSurfacePalette(temp)) {
94                const Uint8 bpp = SDL_BITSPERPIXEL(temp->format);
95                const Uint8 mask = (1 << bpp) - 1;
96                if (SDL_PIXELORDER(temp->format) == SDL_BITMAPORDER_4321)
97                    SDL_SetSurfaceColorKey(temp, true, (*(Uint8 *)temp->pixels) & mask);
98                else
99                    SDL_SetSurfaceColorKey(temp, true, ((*(Uint8 *)temp->pixels) >> (8 - bpp)) & mask);
100            } else {
101                switch (SDL_BITSPERPIXEL(temp->format)) {
102                case 15:
103                    SDL_SetSurfaceColorKey(temp, true,
104                                    (*(Uint16 *)temp->pixels) & 0x00007FFF);
105                    break;
106                case 16:
107                    SDL_SetSurfaceColorKey(temp, true, *(Uint16 *)temp->pixels);
108                    break;
109                case 24:
110                    SDL_SetSurfaceColorKey(temp, true,
111                                    (*(Uint32 *)temp->pixels) & 0x00FFFFFF);
112                    break;
113                case 32:
114                    SDL_SetSurfaceColorKey(temp, true, *(Uint32 *)temp->pixels);
115                    break;
116                }
117            }
118        }
119
120        texture = SDL_CreateTextureFromSurface(renderer, temp);
121        if (!texture) {
122            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s", SDL_GetError());
123        }
124    }
125    SDL_DestroySurface(temp);
126    SDL_free(path);
127    return texture;
128}
129
[FILE END]
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