/**
* Apply fx on the images.
*
* Ruby usage:
* - @verbatim ImageList#fx(expression) @endverbatim
* - @verbatim ImageList#fx(expression, channel) @endverbatim
* - @verbatim ImageList#fx(expression, channel, ...) @endverbatim
*
* Notes:
* - Default channel is AllChannels
*
* @param argc number of input arguments
* @param argv array of input arguments
* @param self this object
* @return a new image
*/
VALUE
ImageList_fx(int argc, VALUE *argv, VALUE self)
{
Image *images, *new_image;
char *expression;
ChannelType channels;
ExceptionInfo *exception;
channels = extract_channels(&argc, argv);
// There must be exactly 1 remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
expression = StringValuePtr(argv[0]);
images = images_from_imagelist(self);
exception = AcquireExceptionInfo();
new_image = FxImageChannel(images, channels, expression, exception);
rm_split(images);
rm_check_exception(exception, new_image, DestroyOnError);
(void) DestroyExceptionInfo(exception);
rm_ensure_result(new_image);
return rm_image_new(new_image);
}
/*
Method: Info#channel(channel [, channel...])
Purpose: Set the channels
Thanks: Douglas Sellers
*/
VALUE
Info_channel(int argc, VALUE *argv, VALUE self)
{
Info *info;
ChannelType channels;
channels = extract_channels(&argc, argv);
// Ensure all arguments consumed.
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
Data_Get_Struct(self, Info, info);
info->channel = channels;
return self;
}
