gdhelpers.h

#ifndef GDHELPERS_H
#define GDHELPERS_H 1
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* sys/types.h is needed for size_t on Sparc-SunOS-4.1 */
#ifndef _WIN32_WCE
#include <sys/types.h>
#else
#include <stdlib.h>
#endif /* _WIN32_WCE */
 
/* TBB: strtok_r is not universal; provide an implementation of it. */
 
char *gd_strtok_r(char *s, const char *sep, char **state);
 
/* These functions wrap memory management. gdFree is
        in gd.h, where callers can utilize it to correctly
        free memory allocated by these functions with the
        right version of free(). */
void *gdCalloc(size_t nmemb, size_t size) BGD_MALLOC;
void *gdMalloc(size_t size) BGD_MALLOC;
void *gdRealloc(void *ptr, size_t size);
/* The extended version of gdReallocEx will free *ptr if the
 * realloc fails */
void *gdReallocEx(void *ptr, size_t size);
 
/* Returns nonzero if multiplying the two quantities will
        result in integer overflow. Also returns nonzero if
        either quantity is negative. By Phil Knirsch based on
        netpbm fixes by Alan Cox. */
 
int overflow2(int a, int b);
int overflowMul3(int a, int b, int c);
 
/* 2.0.16: portable mutex support for thread safety. */
#if defined(CPP_SHARP)
#define gdMutexDeclare(x)
#define gdMutexSetup(x)
#define gdMutexShutdown(x)
#define gdMutexLock(x)
#define gdMutexUnlock(x)
#elif defined(_WIN32)
/* 2.0.18: must include windows.h to get CRITICAL_SECTION. */
#include <windows.h>
#define gdMutexDeclare(x) CRITICAL_SECTION x
#define gdMutexSetup(x) InitializeCriticalSection(&x)
#define gdMutexShutdown(x) DeleteCriticalSection(&x)
#define gdMutexLock(x) EnterCriticalSection(&x)
#define gdMutexUnlock(x) LeaveCriticalSection(&x)
#elif defined(HAVE_PTHREAD)
#include <pthread.h>
#define gdMutexDeclare(x) pthread_mutex_t x
#define gdMutexSetup(x) pthread_mutex_init(&x, 0)
#define gdMutexShutdown(x) pthread_mutex_destroy(&x)
#define gdMutexLock(x) pthread_mutex_lock(&x)
#define gdMutexUnlock(x) pthread_mutex_unlock(&x)
#else
#define gdMutexDeclare(x)
#define gdMutexSetup(x)
#define gdMutexShutdown(x)
#define gdMutexLock(x)
#define gdMutexUnlock(x)
#endif /* _WIN32 || HAVE_PTHREAD */
 
#define DPCM2DPI(dpcm) (unsigned int)((dpcm) * 2.54 + 0.5)
#define DPM2DPI(dpm) (unsigned int)((dpm) * 0.0254 + 0.5)
#define DPI2DPCM(dpi) (unsigned int)((dpi) / 2.54 + 0.5)
#define DPI2DPM(dpi) (unsigned int)((dpi) / 0.0254 + 0.5)
 
#ifdef __cplusplus
}
#endif
 
#endif /* GDHELPERS_H */