looking-glass/client/include/util.h

/**
 * Looking Glass
 * Copyright © 2017-2021 The Looking Glass Authors
 * https://looking-glass.io
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc., 59
 * Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _H_LG_UTIL_
#define _H_LG_UTIL_

#include <stdlib.h>
#include <stdbool.h>
#include "common/types.h"

#define min(a,b) ({ __typeof__ (a) _a = (a); __typeof__ (b) _b = (b); _a < _b ? _a : _b; })
#define max(a,b) ({ __typeof__ (a) _a = (a); __typeof__ (b) _b = (b); _a > _b ? _a : _b; })

#define UPCAST(type, x) \
  (type *)((uintptr_t)(x) - offsetof(type, base))

// reads the specified file into a new buffer
// the callee must free the buffer
bool util_fileGetContents(const char * filename, char ** buffer, size_t * length);

void util_cursorToInt(double ex, double ey, int *x, int *y);
bool util_guestCurToLocal(struct DoublePoint *local);
void util_localCurToGuest(struct DoublePoint *guest);
void util_rotatePoint(struct DoublePoint *point);
bool util_hasGLExt(const char * exts, const char * ext);

static inline double util_clamp(double x, double min, double max)
{
  if (x < min) return min;
  if (x > max) return max;
  return x;
}

bool util_initUIFonts(void);
void util_freeUIFonts(void);
char * util_getUIFont(const char * fontName);

#endif