In resizing effects, add the notion of a “virtual output size”.

[movit] / effect.h

diff --git a/effect.h b/effect.h
index d7db29907dbdb4d070efdbfd00a80e5c04c1d85b..c911f276ef71d94a6ab281f6339c87bb702af806 100644 (file)
--- a/effect.h
+++ b/effect.h
@@ -168,11 +168,16 @@ public:
        virtual bool changes_output_size() const { return false; }
 
        // If changes_output_size() is true, you must implement this to tell
-       // the framework what output size you want.
+       // the framework what output size you want. Also, you can set a
+       // virtual width/height, which is the size the next effect (if any)
+       // will _think_ your data is in. This is primarily useful if you are
+       // relying on getting OpenGL's bilinear resizing for free; otherwise,
+       // your virtual_width/virtual_height should be the same as width/height.
        //
        // Note that it is explicitly allowed to change width and height
        // from frame to frame; EffectChain will reallocate textures as needed.
-       virtual void get_output_size(unsigned *width, unsigned *height) const {
+       virtual void get_output_size(unsigned *width, unsigned *height,
+                                    unsigned *virtual_width, unsigned *virtual_height) const {
                assert(false);
        }