-#ifndef _BLUR_EFFECT_H
-#define _BLUR_EFFECT_H 1
+#ifndef _MOVIT_BLUR_EFFECT_H
+#define _MOVIT_BLUR_EFFECT_H 1
// A separable 2D blur implemented by a combination of mipmap filtering
// and convolution (essentially giving a convolution with a piecewise linear
// Works in two passes; first horizontal, then vertical (BlurEffect,
// which is what the user is intended to use, instantiates two copies of
// SingleBlurPassEffect behind the scenes).
+//
+// The recommended number of taps is the default (16). Fewer will be faster
+// but uglier; a tradeoff that might be worth it as part of more complicated
+// effects. This can be set only before finalization, and must be an
+// even number.
+
+#include <epoxy/gl.h>
+#include <assert.h>
+#include <stddef.h>
+#include <string>
#include "effect.h"
+namespace movit {
+
+class EffectChain;
+class Node;
class SingleBlurPassEffect;
class BlurEffect : public Effect {
virtual bool needs_texture_bounce() const { return true; }
virtual bool needs_mipmaps() const { return true; }
virtual bool needs_srgb_primaries() const { return false; }
- virtual AlphaHandling alpha_handling() const { return INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA; }
virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
virtual void rewrite_graph(EffectChain *graph, Node *self);
virtual bool set_float(const std::string &key, float value);
+ virtual bool set_int(const std::string &key, int value);
private:
void update_radius();
-
+
+ int num_taps;
float radius;
SingleBlurPassEffect *hpass, *vpass;
unsigned input_width, input_height;
class SingleBlurPassEffect : public Effect {
public:
- // If parent is non-NULL, calls to inform_input_size will be forwarded
+ // 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();
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 AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height) {
- if (parent != NULL) {
+ if (parent != nullptr) {
parent->inform_input_size(input_num, width, height);
}
}
virtual bool changes_output_size() const { return true; }
+ virtual bool sets_virtual_output_size() const { return true; }
+ virtual bool one_to_one_sampling() const { return false; } // Can sample outside the border.
virtual void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const {
*width = this->width;
private:
BlurEffect *parent;
+ int num_taps;
float radius;
Direction direction;
int width, height, virtual_width, virtual_height;
+ float *uniform_samples;
};
-#endif // !defined(_BLUR_EFFECT_H)
+} // namespace movit
+
+#endif // !defined(_MOVIT_BLUR_EFFECT_H)