static VALUE
struct_class_layout(VALUE klass)
{
VALUE layout;
if (!rb_cvar_defined(klass, id_layout_ivar)) {
rb_raise(rb_eRuntimeError, "no Struct layout configured for %s", rb_class2name(klass));
}
layout = rb_cvar_get(klass, id_layout_ivar);
if (!rb_obj_is_kind_of(layout, rbffi_StructLayoutClass)) {
rb_raise(rb_eRuntimeError, "invalid Struct layout for %s", rb_class2name(klass));
}
return layout;
}
/*
External: write_temp_image
Purpose: Write a temporary copy of the image to the IM registry
Returns: the "filename" of the registered image
Notes: The `temp_name' argument must point to an char array
of size MaxTextExtent.
*/
void
rm_write_temp_image(Image *image, char *temp_name)
{
#define TMPNAM_CLASS_VAR "@@_tmpnam_"
MagickBooleanType okay;
ExceptionInfo exception;
volatile VALUE id_value;
int id;
GetExceptionInfo(&exception);
// 'id' is always the value of its previous use
if (rb_cvar_defined(Module_Magick, rb_intern(TMPNAM_CLASS_VAR)) == Qtrue)
{
id_value = rb_cv_get(Module_Magick, TMPNAM_CLASS_VAR);
id = FIX2INT(id_value);
}
else
{
id = 0;
rb_cv_set(Module_Magick, TMPNAM_CLASS_VAR, INT2FIX(id));
}
id += 1;
rb_cv_set(Module_Magick, TMPNAM_CLASS_VAR, INT2FIX(id));
sprintf(temp_name, "mpri:%d", id);
// Omit "mpri:" from filename to form the key
okay = SetImageRegistry(ImageRegistryType, temp_name+5, image, &exception);
CHECK_EXCEPTION()
DestroyExceptionInfo(&exception);
if (!okay)
{
rb_raise(rb_eRuntimeError, "SetImageRegistry failed.");
}
}
static VALUE class_spec_cvar_defined(VALUE self, VALUE klass, VALUE id) {
ID as_id = rb_intern(StringValuePtr(id));
return rb_cvar_defined(klass, as_id);
}
