Remove some unneeded conversions from ResampleEffect. Speeds up texture generation...

[movit] / blur_effect.h

diff --git a/blur_effect.h b/blur_effect.h
index 09c6f14117f47266e3ec53449202b7f829274bd3..8ad3da92dc27bb0f164184b04c042de569714038 100644 (file)
--- a/blur_effect.h
+++ b/blur_effect.h
@@ -1,23 +1,111 @@
-#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
+// approximation to the true impulse response).
+//
+// 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 {
 public:
        BlurEffect();
+
+       virtual std::string effect_type_id() const { return "BlurEffect"; }
+
+       // We want this for the same reason as ResizeEffect; we could end up scaling
+       // down quite a lot.
+       virtual bool needs_texture_bounce() const { return true; }
+       virtual bool needs_mipmaps() const { return true; }
+       virtual bool needs_srgb_primaries() const { return false; }
+
+       virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
+
+       virtual std::string output_fragment_shader() {
+               assert(false);
+       }
+       virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) {
+               assert(false);
+       }
+
+       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
+       // 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_many_samples() const { return true; }
+       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; }
 
-       void set_uniforms(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+       virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height) {
+               if (parent != NULL) {
+                       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;
+               *height = this->height;
+               *virtual_width = this->virtual_width;
+               *virtual_height = this->virtual_height;
+       }
+
+       void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+       void clear_gl_state();
+       
        enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
 
 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)