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-/*
- LV2 UI Extension
- Copyright 2009-2011 David Robillard <d@drobilla.net>
- Copyright 2006-2008 Lars Luthman <lars.luthman@gmail.com>
-
- Permission to use, copy, modify, and/or distribute this software for any
- purpose with or without fee is hereby granted, provided that the above
- copyright notice and this permission notice appear in all copies.
-
- THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
-
-/**
- * @file
- * C header for the LV2 UI extension <http://lv2plug.in/ns/extensions/ui>.
- */
-
-#ifndef LV2_UI_H
-#define LV2_UI_H
-
-#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
-
-#define LV2_UI_URI "http://lv2plug.in/ns/extensions/ui"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- A pointer to some widget or other type of UI handle.
-
- The actual type is defined by the type URI of the UI. All the functionality
- provided by this extension is toolkit independent, the host only needs to
- pass the necessary callbacks and display the widget, if possible. Plugins
- may have several UIs, in various toolkits.
-*/
-typedef void* LV2UI_Widget;
-
-/**
- A pointer to a particular instance of a UI.
-
- It is valid to compare this to NULL (0 for C++) but otherwise the host MUST
- not attempt to interpret it. The UI plugin may use it to reference internal
- instance data.
-*/
-typedef void* LV2UI_Handle;
-
-/**
- A pointer to a particular plugin controller, provided by the host.
-
- It is valid to compare this to NULL (0 for C++) but otherwise the UI plugin
- MUST NOT attempt to interpret it. The host may use it to reference internal
- instance data.
-*/
-typedef void* LV2UI_Controller;
-
-/**
- The type of the host-provided function that the UI can use to
- send data to a plugin's input ports.
-
- The @c buffer parameter must point to a block of data, @c buffer_size bytes
- large. The contents of this buffer and what the host should do with it
- depends on the value of the @c format parameter.
-
- The @c format parameter should either be 0 or a numeric ID for a "Transfer
- mechanism". Transfer mechanisms are Features and may be defined in
- meta-extensions. They specify how to translate the data buffers passed to
- this function to input data for the plugin ports. If a UI wishes to write
- data to an input port, it must list a transfer mechanism Feature for that
- port's class as an optional or required feature (depending on whether the UI
- will work without being able to write to that port or not). The only
- exception is when the UI wants to write single float values to input ports
- of the class lv2:ControlPort, in which case @c buffer_size should always be
- 4, the buffer should always contain a single IEEE-754 float, and @c format
- should be 0.
-
- The numeric IDs for the transfer mechanisms are provided by a URI-to-integer
- mapping function provided by the host, using the URI Map feature
- <http://lv2plug.in/ns/ext/uri-map> with the map URI
- "http://lv2plug.in/ns/extensions/ui". Thus a UI that requires transfer
- mechanism features also requires the URI Map feature, but this is implicit -
- the UI does not have to list the URI map feature as a required or optional
- feature in it's RDF data.
-
- An UI MUST NOT pass a @c format parameter value (except 0) that has not been
- returned by the host-provided URI mapping function for a host-supported
- transfer mechanism feature URI.
-
- The UI MUST NOT try to write to a port for which there is no specified
- transfer mechanism, or to an output port. The UI is responsible for
- allocating the buffer and deallocating it after the call.
-*/
-typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller,
- uint32_t port_index,
- uint32_t buffer_size,
- uint32_t format,
- const void* buffer);
-
-/**
- The implementation of a UI.
-
- A pointer to an object of this type is returned by the lv2ui_descriptor()
- function.
-*/
-typedef struct _LV2UI_Descriptor {
- /**
- The URI for this UI (not for the plugin it controls).
- */
- const char* URI;
-
- /**
- Create a new UI object and return a handle to it. This function works
- similarly to the instantiate() member in LV2_Descriptor.
-
- @param descriptor The descriptor for the UI that you want to instantiate.
-
- @param plugin_uri The URI of the plugin that this UI will control.
-
- @param bundle_path The path to the bundle containing the RDF data file
- that references this shared object file, including the trailing '/'.
-
- @param write_function A function provided by the host that the UI can use
- to send data to the plugin's input ports.
-
- @param controller A handle for the plugin instance that should be passed
- as the first parameter of @c write_function.
-
- @param widget A pointer to an LV2UI_Widget. The UI will write a widget
- pointer to this location (what type of widget depends on the RDF class of
- the UI) that will be the main UI widget.
-
- @param features An array of LV2_Feature pointers. The host must pass all
- feature URIs that it and the UI supports and any additional data, just
- like in the LV2 plugin instantiate() function. Note that UI features and
- plugin features are NOT necessarily the same, they just share the same
- data structure - this will probably not be the same array as the one the
- plugin host passes to a plugin.
-
- */
- LV2UI_Handle (*instantiate)(const struct _LV2UI_Descriptor* descriptor,
- const char* plugin_uri,
- const char* bundle_path,
- LV2UI_Write_Function write_function,
- LV2UI_Controller controller,
- LV2UI_Widget* widget,
- const LV2_Feature* const* features);
-
-
- /**
- Destroy the UI object and the associated widget. The host must not try
- to access the widget after calling this function.
- */
- void (*cleanup)(LV2UI_Handle ui);
-
- /**
- Tell the UI that something interesting has happened at a plugin port.
-
- What is interesting and how it is written to the buffer passed to this
- function is defined by the @c format parameter, which has the same meaning
- as in LV2UI_Write_Function. The only exception is ports of the class
- lv2:ControlPort, for which this function should be called when the port
- value changes (it does not have to be called for every single change if
- the host's UI thread has problems keeping up with the thread the plugin is
- running in), @c buffer_size should be 4, the buffer should contain a
- single IEEE-754 float, and @c format should be 0.
-
- By default, the host should only call this function for input ports of the
- lv2:ControlPort class. However, the default setting can be modified by
- using the following URIs in the UI's RDF data:
- <pre>
- uiext:portNotification
- uiext:noPortNotification
- uiext:plugin
- uiext:portIndex
- </pre>
- For example, if you want the UI with uri
- <code><http://my.pluginui></code> for the plugin with URI
- <code><http://my.plugin></code> to get notified when the value of the
- output control port with index 4 changes, you would use the following
- in the RDF for your UI:
- <pre>
- <http://my.pluginui> uiext:portNotification [ uiext:plugin <http://my.plugin> ;
- uiext:portIndex 4 ] .
- </pre>
- and similarly with <code>uiext:noPortNotification</code> if you wanted
- to prevent notifications for a port for which it would be on by default
- otherwise. The UI is not allowed to request notifications for ports of
- types for which no transfer mechanism is specified, if it does it should
- be considered broken and the host should not load it.
-
- The @c buffer is only valid during the time of this function call, so if
- the UI wants to keep it for later use it has to copy the contents to an
- internal buffer.
-
- This member may be set to NULL if the UI is not interested in any
- port events.
- */
- void (*port_event)(LV2UI_Handle ui,
- uint32_t port_index,
- uint32_t buffer_size,
- uint32_t format,
- const void* buffer);
-
- /**
- Return a data structure associated with an extension URI, for example
- a struct containing additional function pointers.
-
- Avoid returning function pointers directly since standard C/C++ has no
- valid way of casting a void* to a function pointer. This member may be set
- to NULL if the UI is not interested in supporting any extensions. This is
- similar to the extension_data() member in LV2_Descriptor.
- */
- const void* (*extension_data)(const char* uri);
-
-} LV2UI_Descriptor;
-
-/**
- A plugin UI programmer must include a function called "lv2ui_descriptor"
- with the following function prototype within the shared object file. This
- function will have C-style linkage (if you are using C++ this is taken care
- of by the 'extern "C"' clause at the top of the file). This function will
- be accessed by the UI host using the @c dlsym() function and called to get a
- LV2UI_UIDescriptor for the wanted plugin.
-
- Just like lv2_descriptor(), this function takes an index parameter. The
- index should only be used for enumeration and not as any sort of ID number -
- the host should just iterate from 0 and upwards until the function returns
- NULL or a descriptor with an URI matching the one the host is looking for.
-*/
-const LV2UI_Descriptor* lv2ui_descriptor(uint32_t index);
-
-/**
- The type of the lv2ui_descriptor() function.
-*/
-typedef const LV2UI_Descriptor* (*LV2UI_DescriptorFunction)(uint32_t index);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* LV2_UI_H */