update [LV2] Plugin Inline Display API: drop cairo dependency

1 files changed, 18 insertions, 5 deletions

diff --git a/libs/ardour/ardour/lv2_extensions.h b/libs/ardour/ardour/lv2_extensions.h
index 5fd69cfe99..139e1a6594 100644
--- a/libs/ardour/ardour/lv2_extensions.h
+++ b/libs/ardour/ardour/lv2_extensions.h
@@ -36,13 +36,23 @@
 /** Opaque handle for LV2_Inline_Display::queue_draw() */
 typedef void* LV2_Inline_Display_Handle;
 
-/** Alias for cairo_image_surface_t */
-typedef void* LV2_Inline_Display_Image_Surface;
+/** raw image pixmap format is ARGB32,
+ * the data pointer is owned by the plugin and must be valid
+ * from the first call to render until cleanup.
+ */
+typedef struct {
+	unsigned char *data;
+	int width;
+	int height;
+	int stride;
+} LV2_Inline_Display_Image_Surface;
 
+/** a LV2 Feature provided by the Host to the plugin */
 typedef struct {
 	/** Opaque host data */
 	LV2_Inline_Display_Handle handle;
-	/** Request from run() that the host should call render() */
+	/** Request from run() that the host should call render() at a later time
+	 * to update the inline display */
 	void (*queue_draw)(LV2_Inline_Display_Handle handle);
 } LV2_Inline_Display;
 
@@ -53,12 +63,15 @@ typedef struct {
 	/**
 	 * The render method. This is called by the host in a non-realtime context,
 	 * usually the main GUI thread.
+	 * The data pointer is owned by the plugin and must be valid
+	 * from the first call to render until cleanup.
 	 *
 	 * @param instance The LV2 instance
 	 * @param w the max available width
-	 * @return pointer to a cairo image surface or NULL
+	 * @param h the max available height
+	 * @return pointer to a LV2_Inline_Display_Image_Surface or NULL
 	 */
-	LV2_Inline_Display_Image_Surface (*render)(LV2_Handle instance, uint32_t w, uint32_t h);
+	LV2_Inline_Display_Image_Surface* (*render)(LV2_Handle instance, uint32_t w, uint32_t h);
 } LV2_Inline_Display_Interface;
 
 /**