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Diffstat (limited to 'lv2/ui/ui.h')
| -rw-r--r-- | lv2/ui/ui.h | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/lv2/ui/ui.h b/lv2/ui/ui.h new file mode 100644 index 0000000..450a41e --- /dev/null +++ b/lv2/ui/ui.h @@ -0,0 +1,445 @@ +/* + LV2 UI Extension + Copyright 2009-2016 David Robillard <d@drobilla.net> + Copyright 2006-2011 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. +*/ + +/** + @defgroup ui User Interfaces + + User interfaces of any type for plugins, + <http://lv2plug.in/ns/extensions/ui> for details. + + @{ +*/ + +#ifndef LV2_UI_H +#define LV2_UI_H + +#include "lv2/core/lv2.h" + +#include <stdbool.h> +#include <stdint.h> + +#define LV2_UI_URI "http://lv2plug.in/ns/extensions/ui" ///< http://lv2plug.in/ns/extensions/ui +#define LV2_UI_PREFIX LV2_UI_URI "#" ///< http://lv2plug.in/ns/extensions/ui# + +#define LV2_UI__CocoaUI LV2_UI_PREFIX "CocoaUI" ///< http://lv2plug.in/ns/extensions/ui#CocoaUI +#define LV2_UI__Gtk3UI LV2_UI_PREFIX "Gtk3UI" ///< http://lv2plug.in/ns/extensions/ui#Gtk3UI +#define LV2_UI__GtkUI LV2_UI_PREFIX "GtkUI" ///< http://lv2plug.in/ns/extensions/ui#GtkUI +#define LV2_UI__PortNotification LV2_UI_PREFIX "PortNotification" ///< http://lv2plug.in/ns/extensions/ui#PortNotification +#define LV2_UI__PortProtocol LV2_UI_PREFIX "PortProtocol" ///< http://lv2plug.in/ns/extensions/ui#PortProtocol +#define LV2_UI__Qt4UI LV2_UI_PREFIX "Qt4UI" ///< http://lv2plug.in/ns/extensions/ui#Qt4UI +#define LV2_UI__Qt5UI LV2_UI_PREFIX "Qt5UI" ///< http://lv2plug.in/ns/extensions/ui#Qt5UI +#define LV2_UI__UI LV2_UI_PREFIX "UI" ///< http://lv2plug.in/ns/extensions/ui#UI +#define LV2_UI__WindowsUI LV2_UI_PREFIX "WindowsUI" ///< http://lv2plug.in/ns/extensions/ui#WindowsUI +#define LV2_UI__X11UI LV2_UI_PREFIX "X11UI" ///< http://lv2plug.in/ns/extensions/ui#X11UI +#define LV2_UI__binary LV2_UI_PREFIX "binary" ///< http://lv2plug.in/ns/extensions/ui#binary +#define LV2_UI__fixedSize LV2_UI_PREFIX "fixedSize" ///< http://lv2plug.in/ns/extensions/ui#fixedSize +#define LV2_UI__idleInterface LV2_UI_PREFIX "idleInterface" ///< http://lv2plug.in/ns/extensions/ui#idleInterface +#define LV2_UI__noUserResize LV2_UI_PREFIX "noUserResize" ///< http://lv2plug.in/ns/extensions/ui#noUserResize +#define LV2_UI__notifyType LV2_UI_PREFIX "notifyType" ///< http://lv2plug.in/ns/extensions/ui#notifyType +#define LV2_UI__parent LV2_UI_PREFIX "parent" ///< http://lv2plug.in/ns/extensions/ui#parent +#define LV2_UI__plugin LV2_UI_PREFIX "plugin" ///< http://lv2plug.in/ns/extensions/ui#plugin +#define LV2_UI__portIndex LV2_UI_PREFIX "portIndex" ///< http://lv2plug.in/ns/extensions/ui#portIndex +#define LV2_UI__portMap LV2_UI_PREFIX "portMap" ///< http://lv2plug.in/ns/extensions/ui#portMap +#define LV2_UI__portNotification LV2_UI_PREFIX "portNotification" ///< http://lv2plug.in/ns/extensions/ui#portNotification +#define LV2_UI__portSubscribe LV2_UI_PREFIX "portSubscribe" ///< http://lv2plug.in/ns/extensions/ui#portSubscribe +#define LV2_UI__protocol LV2_UI_PREFIX "protocol" ///< http://lv2plug.in/ns/extensions/ui#protocol +#define LV2_UI__floatProtocol LV2_UI_PREFIX "floatProtocol" ///< http://lv2plug.in/ns/extensions/ui#floatProtocol +#define LV2_UI__peakProtocol LV2_UI_PREFIX "peakProtocol" ///< http://lv2plug.in/ns/extensions/ui#peakProtocol +#define LV2_UI__resize LV2_UI_PREFIX "resize" ///< http://lv2plug.in/ns/extensions/ui#resize +#define LV2_UI__showInterface LV2_UI_PREFIX "showInterface" ///< http://lv2plug.in/ns/extensions/ui#showInterface +#define LV2_UI__touch LV2_UI_PREFIX "touch" ///< http://lv2plug.in/ns/extensions/ui#touch +#define LV2_UI__ui LV2_UI_PREFIX "ui" ///< http://lv2plug.in/ns/extensions/ui#ui +#define LV2_UI__updateRate LV2_UI_PREFIX "updateRate" ///< http://lv2plug.in/ns/extensions/ui#updateRate +#define LV2_UI__windowTitle LV2_UI_PREFIX "windowTitle" ///< http://lv2plug.in/ns/extensions/ui#windowTitle + +/** + The index returned by LV2UI_Port_Map::port_index() for unknown ports. +*/ +#define LV2UI_INVALID_PORT_INDEX ((uint32_t)-1) + +#ifdef __cplusplus +extern "C" { +#endif + +/** + A pointer to some widget or other type of UI handle. + + The actual type is defined by the type of the UI. +*/ +typedef void* LV2UI_Widget; + +/** + A pointer to UI instance internals. + + The host may compare this to NULL, but otherwise MUST NOT interpret it. +*/ +typedef void* LV2UI_Handle; + +/** + A pointer to a controller provided by the host. + + The UI may compare this to NULL, but otherwise MUST NOT interpret it. +*/ +typedef void* LV2UI_Controller; + +/** + A pointer to opaque data for a feature. +*/ +typedef void* LV2UI_Feature_Handle; + +/** + A host-provided function that sends data to a plugin's input ports. + + @param controller The opaque controller pointer passed to + LV2UI_Descriptor::instantiate(). + + @param port_index Index of the port to update. + + @param buffer Buffer containing `buffer_size` bytes of data. + + @param buffer_size Size of `buffer` in bytes. + + @param port_protocol Either 0 or the URID for a ui:PortProtocol. If 0, the + protocol is implicitly ui:floatProtocol, the port MUST be an lv2:ControlPort + input, `buffer` MUST point to a single float value, and `buffer_size` MUST + be sizeof(float). The UI SHOULD NOT use a protocol not supported by the + host, but the host MUST gracefully ignore any protocol it does not + understand. +*/ +typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller, + uint32_t port_index, + uint32_t buffer_size, + uint32_t port_protocol, + const void* buffer); + +/** + A plugin 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 and return a handle to it. This function works + similarly to LV2_Descriptor::instantiate(). + + @param descriptor The descriptor for the UI to instantiate. + + @param plugin_uri The URI of the plugin that this UI will control. + + @param bundle_path The path to the bundle containing this UI, including + the trailing directory separator. + + @param write_function A function that the UI can use to send data to the + plugin's input ports. + + @param controller A handle for the UI instance to be passed as the + first parameter of UI methods. + + @param widget (output) widget pointer. The UI points this at its main + widget, which has the type defined by the UI type in the data file. + + @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, as + in LV2_Descriptor::instantiate(). Note that UI features and plugin + features are not necessarily the same. + + */ + 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. 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 `buffer` is defined by + `format`, which has the same meaning as in LV2UI_Write_Function(). + Format 0 is a special case for lv2:ControlPort, where this function + should be called when the port value changes (but not necessarily for + every change), `buffer_size` must be sizeof(float), and `buffer` + points to a single IEEE-754 float. + + By default, the host should only call this function for lv2:ControlPort + inputs. However, the UI can request updates for other ports statically + with ui:portNotification or dynamicaly with ui:portSubscribe. + + The UI MUST NOT retain any reference to `buffer` after this function + returns, it is only valid for the duration of the call. + + This member may be 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, typically an + interface struct with additional function pointers + + This member may be set to NULL if the UI is not interested in supporting + any extensions. This is similar to LV2_Descriptor::extension_data(). + + */ + const void* (*extension_data)(const char* uri); +} LV2UI_Descriptor; + +/** + Feature/interface for resizable UIs (LV2_UI__resize). + + This structure is used in two ways: as a feature passed by the host via + LV2UI_Descriptor::instantiate(), or as an interface provided by a UI via + LV2UI_Descriptor::extension_data()). +*/ +typedef struct _LV2UI_Resize { + /** + Pointer to opaque data which must be passed to ui_resize(). + */ + LV2UI_Feature_Handle handle; + + /** + Request/advertise a size change. + + When provided by the host, the UI may call this function to inform the + host about the size of the UI. + + When provided by the UI, the host may call this function to notify the + UI that it should change its size accordingly. In this case, the host + must pass the LV2UI_Handle to provide access to the UI instance. + + @return 0 on success. + */ + int (*ui_resize)(LV2UI_Feature_Handle handle, int width, int height); +} LV2UI_Resize; + +/** + Feature to map port symbols to UIs. + + This can be used by the UI to get the index for a port with the given + symbol. This makes it possible to implement and distribute a UI separately + from the plugin (since symbol, unlike index, is a stable port identifier). +*/ +typedef struct _LV2UI_Port_Map { + /** + Pointer to opaque data which must be passed to port_index(). + */ + LV2UI_Feature_Handle handle; + + /** + Get the index for the port with the given `symbol`. + + @return The index of the port, or LV2UI_INVALID_PORT_INDEX if no such + port is found. + */ + uint32_t (*port_index)(LV2UI_Feature_Handle handle, const char* symbol); +} LV2UI_Port_Map; + +/** + Feature to subscribe to port updates (LV2_UI__portSubscribe). +*/ +typedef struct _LV2UI_Port_Subscribe { + /** + Pointer to opaque data which must be passed to subscribe() and + unsubscribe(). + */ + LV2UI_Feature_Handle handle; + + /** + Subscribe to updates for a port. + + This means that the host will call the UI's port_event() function when + the port value changes (as defined by protocol). + + Calling this function with the same `port_index` and `port_protocol` + as an already active subscription has no effect. + + @param handle The handle field of this struct. + @param port_index The index of the port. + @param port_protocol The URID of the ui:PortProtocol. + @param features Features for this subscription. + @return 0 on success. + */ + uint32_t (*subscribe)(LV2UI_Feature_Handle handle, + uint32_t port_index, + uint32_t port_protocol, + const LV2_Feature* const* features); + + /** + Unsubscribe from updates for a port. + + This means that the host will cease calling calling port_event() when + the port value changes. + + Calling this function with a `port_index` and `port_protocol` that + does not refer to an active port subscription has no effect. + + @param handle The handle field of this struct. + @param port_index The index of the port. + @param port_protocol The URID of the ui:PortProtocol. + @param features Features for this subscription. + @return 0 on success. + */ + uint32_t (*unsubscribe)(LV2UI_Feature_Handle handle, + uint32_t port_index, + uint32_t port_protocol, + const LV2_Feature* const* features); +} LV2UI_Port_Subscribe; + +/** + A feature to notify the host that the user has grabbed a UI control. +*/ +typedef struct _LV2UI_Touch { + /** + Pointer to opaque data which must be passed to ui_resize(). + */ + LV2UI_Feature_Handle handle; + + /** + Notify the host that a control has been grabbed or released. + + The host should cease automating the port or otherwise manipulating the + port value until the control has been ungrabbed. + + @param handle The handle field of this struct. + @param port_index The index of the port associated with the control. + @param grabbed If true, the control has been grabbed, otherwise the + control has been released. + */ + void (*touch)(LV2UI_Feature_Handle handle, + uint32_t port_index, + bool grabbed); +} LV2UI_Touch; + +/** + UI Idle Interface (LV2_UI__idleInterface) + + UIs can provide this interface to have an idle() callback called by the host + rapidly to update the UI. +*/ +typedef struct _LV2UI_Idle_Interface { + /** + Run a single iteration of the UI's idle loop. + + This will be called rapidly in the UI thread at a rate appropriate + for a toolkit main loop. There are no precise timing guarantees, but + the host should attempt to call idle() at a high enough rate for smooth + animation, at least 30Hz. + + @return non-zero if the UI has been closed, in which case the host + should stop calling idle(), and can either completely destroy the UI, or + re-show it and resume calling idle(). + */ + int (*idle)(LV2UI_Handle ui); +} LV2UI_Idle_Interface; + +/** + UI Show Interface (LV2_UI__showInterface) + + UIs can provide this interface to show and hide a window, which allows them + to function in hosts unable to embed their widget. This allows any UI to + provide a fallback for embedding that works in any host. + + If used: + - The host MUST use LV2UI_Idle_Interface to drive the UI. + - The UI MUST return non-zero from LV2UI_Idle_Interface::idle() when it has been closed. + - If idle() returns non-zero, the host MUST call hide() and stop calling + idle(). It MAY later call show() then resume calling idle(). +*/ +typedef struct _LV2UI_Show_Interface { + /** + Show a window for this UI. + + The window title MAY have been passed by the host to + LV2UI_Descriptor::instantiate() as an LV2_Options_Option with key + LV2_UI__windowTitle. + + @return 0 on success, or anything else to stop being called. + */ + int (*show)(LV2UI_Handle ui); + + /** + Hide the window for this UI. + + @return 0 on success, or anything else to stop being called. + */ + int (*hide)(LV2UI_Handle ui); +} LV2UI_Show_Interface; + +/** + Peak data for a slice of time, the update format for ui:peakProtocol. +*/ +typedef struct _LV2UI_Peak_Data { + /** + The start of the measurement period. This is just a running counter + that is only meaningful in comparison to previous values and must not be + interpreted as an absolute time. + */ + uint32_t period_start; + + /** + The size of the measurement period, in the same units as period_start. + */ + uint32_t period_size; + + /** + The peak value for the measurement period. This should be the maximal + value for abs(sample) over all the samples in the period. + */ + float peak; +} LV2UI_Peak_Data; + +/** + Prototype for UI accessor function. + + This is the entry point to a UI library, which works in the same way as + lv2_descriptor() but for UIs rather than plugins. +*/ +LV2_SYMBOL_EXPORT +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 */ + +/** + @} +*/ |