152 lines
4.4 KiB
C
152 lines
4.4 KiB
C
/*
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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Copyright 2022 Collabora Ltd.
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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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#include "testutils.h"
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/**
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* Return the absolute path to def in the SDL_GetBasePath() if possible, or
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* the relative path to def on platforms that don't have a working
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* SDL_GetBasePath(). Free the result with SDL_free.
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*
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* Fails and returns NULL if out of memory.
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*/
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char *
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GetNearbyFilename(const char *file)
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{
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char *base;
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char *path;
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base = SDL_GetBasePath();
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if (base) {
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SDL_IOStream *rw;
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size_t len = SDL_strlen(base) + SDL_strlen(file) + 1;
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path = SDL_malloc(len);
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if (!path) {
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SDL_free(base);
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return NULL;
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}
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(void)SDL_snprintf(path, len, "%s%s", base, file);
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SDL_free(base);
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rw = SDL_IOFromFile(path, "rb");
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if (rw) {
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SDL_CloseIO(rw);
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return path;
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}
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/* Couldn't find the file in the base path */
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SDL_free(path);
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}
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return SDL_strdup(file);
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}
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/**
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* If user_specified is non-NULL, return a copy of it. Free with SDL_free.
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*
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* Otherwise, return the absolute path to def in the SDL_GetBasePath() if
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* possible, or the relative path to def on platforms that don't have a
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* working SDL_GetBasePath(). Free the result with SDL_free.
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*
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* Fails and returns NULL if out of memory.
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*/
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char *
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GetResourceFilename(const char *user_specified, const char *def)
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{
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if (user_specified) {
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return SDL_strdup(user_specified);
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}
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return GetNearbyFilename(def);
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}
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/**
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* Load the .bmp file whose name is file, from the SDL_GetBasePath() if
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* possible or the current working directory if not.
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*
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* If transparent is true, set the transparent colour from the top left pixel.
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*
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* If width_out is non-NULL, set it to the texture width.
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*
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* If height_out is non-NULL, set it to the texture height.
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*/
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SDL_Texture *
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LoadTexture(SDL_Renderer *renderer, const char *file, SDL_bool transparent,
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int *width_out, int *height_out)
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{
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SDL_Surface *temp = NULL;
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SDL_Texture *texture = NULL;
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char *path;
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path = GetNearbyFilename(file);
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if (path) {
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file = path;
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}
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temp = SDL_LoadBMP(file);
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if (!temp) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
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} else {
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/* Set transparent pixel as the pixel at (0,0) */
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if (transparent) {
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if (temp->format->palette) {
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const Uint8 bpp = temp->format->bits_per_pixel;
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const Uint8 mask = (1 << bpp) - 1;
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if (SDL_PIXELORDER(temp->format->format) == SDL_BITMAPORDER_4321)
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SDL_SetSurfaceColorKey(temp, SDL_TRUE, (*(Uint8 *)temp->pixels) & mask);
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else
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SDL_SetSurfaceColorKey(temp, SDL_TRUE, ((*(Uint8 *)temp->pixels) >> (8 - bpp)) & mask);
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} else {
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switch (temp->format->bits_per_pixel) {
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case 15:
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SDL_SetSurfaceColorKey(temp, SDL_TRUE,
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(*(Uint16 *)temp->pixels) & 0x00007FFF);
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break;
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case 16:
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SDL_SetSurfaceColorKey(temp, SDL_TRUE, *(Uint16 *)temp->pixels);
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break;
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case 24:
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SDL_SetSurfaceColorKey(temp, SDL_TRUE,
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(*(Uint32 *)temp->pixels) & 0x00FFFFFF);
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break;
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case 32:
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SDL_SetSurfaceColorKey(temp, SDL_TRUE, *(Uint32 *)temp->pixels);
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break;
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}
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}
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}
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if (width_out) {
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*width_out = temp->w;
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}
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if (height_out) {
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*height_out = temp->h;
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}
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texture = SDL_CreateTextureFromSurface(renderer, temp);
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if (!texture) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
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}
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}
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SDL_DestroySurface(temp);
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if (path) {
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SDL_free(path);
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}
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return texture;
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}
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