Add NanoVG::createImageFromTextureHandle

dgl/NanoVG.hpp

@@ -196,8 +196,7 @@ public:
         IMAGE_REPEAT_X         = 1 << 1, // Repeat image in X direction.
         IMAGE_REPEAT_Y         = 1 << 2, // Repeat image in Y direction.
         IMAGE_FLIP_Y           = 1 << 3, // Flips (inverses) image in Y direction when rendered.
-        IMAGE_PREMULTIPLIED    = 1 << 4, // Image data has premultiplied alpha.
-        IMAGE_NODELETE         = 1 << 16,// Do not delete GL texture handle.
+        IMAGE_PREMULTIPLIED    = 1 << 4  // Image data has premultiplied alpha.
     };
 
     enum Align {
@@ -538,6 +537,13 @@ public:
 
     // TODO overloaded?
 
+   /**
+      Creates image from an OpenGL texture handle.
+    */
+    NanoImage* createImageFromTextureHandle(GLuint textureId, uint w, uint h, int imageFlags, bool deleteTexture = false);
+
+    // TODO overloaded?
+
    /* --------------------------------------------------------------------
     * Paints */
 

dgl/src/NanoVG.cpp

@@ -522,6 +522,20 @@ NanoImage* NanoVG::createImageRGBA(uint w, uint h, const uchar* data, int imageF
     return nullptr;
 }
 
+NanoImage* NanoVG::createImageFromTextureHandle(GLuint textureId, uint w, uint h, int imageFlags, bool deleteTexture)
+{
+    if (fContext == nullptr) return nullptr;
+    DISTRHO_SAFE_ASSERT_RETURN(textureId != 0, nullptr);
+
+    if (! deleteTexture)
+        imageFlags |= NVG_IMAGE_NODELETE;
+
+    if (const int imageId = nvglCreateImageFromHandle(fContext, textureId, static_cast<int>(w), static_cast<int>(h), imageFlags))
+        return new NanoImage(fContext, imageId);
+
+    return nullptr;
+}
+
 // -----------------------------------------------------------------------
 // Paints