- SingleBlurPassEffect();
- virtual std::string effect_type_id() const { return "SingleBlurPassEffect"; }
-
- std::string output_fragment_shader();
-
- virtual bool needs_texture_bounce() const { return true; }
- virtual bool needs_mipmaps() const { return true; }
- virtual bool needs_srgb_primaries() const { return false; }
-
- virtual bool changes_output_size() const { return true; }
+ // If parent is non-nullptr, calls to inform_input_size will be forwarded
+ // so that it can make reasonable decisions for both blur passes.
+ SingleBlurPassEffect(BlurEffect *parent);
+ virtual ~SingleBlurPassEffect();
+ std::string effect_type_id() const override { return "SingleBlurPassEffect"; }
+
+ std::string output_fragment_shader() override;
+
+ bool needs_texture_bounce() const override { return true; }
+ bool needs_mipmaps() const override { return true; }
+ bool needs_srgb_primaries() const override { return false; }
+ AlphaHandling alpha_handling() const override { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+
+ void inform_input_size(unsigned input_num, unsigned width, unsigned height) override {
+ if (parent != nullptr) {
+ parent->inform_input_size(input_num, width, height);
+ }
+ }
+ bool changes_output_size() const override { return true; }
+ bool sets_virtual_output_size() const override { return true; }
+ bool one_to_one_sampling() const override { return false; } // Can sample outside the border.