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/**
* A collection of helper functions used in DMagick.
*
* Copyright: Mike Wey 2011
* License: zlib (See accompanying LICENSE file)
* Authors: Mike Wey
*/
module dmagick.Utils;
import std.math;
import dmagick.Exception;
import dmagick.c.memory;
import dmagick.c.magickString;
import dmagick.c.magickType;
/**
* Copy a string into a static array used
* by ImageMagick for some atributes.
*/
void copyString(ref char[MaxTextExtent] dest, string source)
{
if ( source.length > MaxTextExtent )
throw new ResourceLimitException("Source is larger then MaxTextExtend", null);
dest[0 .. source.length] = source;
dest[source.length] = '\0';
}
unittest
{
char[MaxTextExtent] dest;
copyString(dest, "unittest");
assert(dest[0 .. 8] == "unittest");
}
/**
* Our implementation of ImageMagick's CloneString.
*
* We use this since using CloneString forces us to
* append a \0 to the end of the string, and the realocation
* whould be wastefull if we are just going to copy it
*
* used for copying a string into a Imagemagick struct
*/
void copyString(ref char* dest, string source)
{
if ( source is null )
{
if ( dest !is null )
dest = DestroyString(dest);
return;
}
if ( ~source.length < MaxTextExtent )
throw new ResourceLimitException("unable to acquire string", null);
if ( dest is null )
dest = cast(char*)AcquireQuantumMemory(source.length+MaxTextExtent, dest.sizeof);
else
dest = cast(char*)ResizeQuantumMemory(dest, source.length+MaxTextExtent, dest.sizeof);
if ( dest is null )
throw new ResourceLimitException("unable to acquire string", null);
if ( source.length > 0 )
dest[0 .. source.length] = source;
dest[source.length] = '\0';
}
unittest
{
char* dest;
string source = "test";
copyString(dest, source);
assert( dest !is source.ptr );
assert( dest[0..5] == "test\0" );
copyString(dest, "unit");
assert( dest[0..5] == "unit\0" );
copyString(dest, null);
assert( dest is null );
}
/** */
real degreesToRadians(real deg)
{
return deg*PI/180;
}
/**
* A template struct to make pointers to ImageMagick structs
* reference counted. Excepts a predicate pred which destroys
* the struct pointer when refCount is 0.
*/
struct RefCounted(alias pred, T)
if ( !is(T == class) && is(typeof(pred(cast(T*)null)) == T*) )
{
T* payload;
private bool isInitialized;
private size_t* refcount;
alias payload this;
this(T* payload)
{
this.payload = payload;
refcount = new size_t;
*refcount = 1;
isInitialized = true;
}
this(this)
{
if ( isInitialized )
(*refcount)++;
}
~this()
{
if ( !isInitialized )
return;
(*refcount)--;
if ( *refcount == 0 )
payload = pred(payload);
}
@property size_t refCount()
{
return *refcount;
}
}
unittest
{
int x = 10;
int y = 20;
alias RefCounted!( (int* t){ x = 20; return t; }, int ) IntRef;
auto a = IntRef(&x);
assert( a.refCount == 1 );
auto b = a;
assert( a.refCount == 2 );
b = IntRef(&y);
assert( a.refCount == 1 );
assert( b.refCount == 1 );
a = b;
assert( b.refCount == 2 );
assert( x == 20 );
}
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