Release Movit 1.6.2.

[movit] / blur_effect.h

diff --git a/blur_effect.h b/blur_effect.h
index 2aada42061098561892b71b3d6d1fb1a2d91f19f..b543ebc5a52f627625b5579766edd91684fcffec 100644 (file)
--- a/blur_effect.h
+++ b/blur_effect.h
@@ -1,5 +1,5 @@
-#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
@@ -8,67 +8,100 @@
 // 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"; }
+       std::string effect_type_id() const override { 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; }
+       void inform_input_size(unsigned input_num, unsigned width, unsigned height) override;
 
-       virtual std::string output_fragment_shader() {
+       std::string output_fragment_shader() override {
                assert(false);
        }
-       virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) {
+       void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override {
                assert(false);
        }
 
-       virtual void rewrite_graph(EffectChain *graph, Node *self);
-       virtual bool set_float(const std::string &key, float value);
+       void rewrite_graph(EffectChain *graph, Node *self) override;
+       bool set_float(const std::string &key, float value) override;
+       bool set_int(const std::string &key, int value) override;
        
 private:
        void update_radius();
-       
+
+       int num_taps;
        float radius;
        SingleBlurPassEffect *hpass, *vpass;
+       unsigned input_width, input_height;
 };
 
 class SingleBlurPassEffect : public Effect {
 public:
-       SingleBlurPassEffect();
-       virtual std::string effect_type_id() const { return "SingleBlurPassEffect"; }
-
-       std::string output_fragment_shader();
+       // 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"; }
 
-       virtual bool needs_texture_bounce() const { return true; }
-       virtual bool needs_mipmaps() const { return true; }
-       virtual bool needs_srgb_primaries() const { return false; }
+       std::string output_fragment_shader() override;
 
-       virtual bool changes_output_size() const { return true; }
+       // We want this for the same reason as ResizeEffect; we could end up scaling
+       // down quite a lot.
+       bool needs_texture_bounce() const override { return true; }
+       MipmapRequirements needs_mipmaps() const override { return NEEDS_MIPMAPS; }
+       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.
 
-       virtual void get_output_size(unsigned *width, unsigned *height) const {
+       void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const override {
                *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();
+       void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;
+       void clear_gl_state() override;
        
        enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
 
 private:
+       BlurEffect *parent;
+       int num_taps;
        float radius;
        Direction direction;
-       int width, height;
+       int width, height, virtual_width, virtual_height;
+       float *uniform_samples;
 };
 
-#endif // !defined(_BLUR_EFFECT_H)
+}  // namespace movit
+
+#endif // !defined(_MOVIT_BLUR_EFFECT_H)