/usr/include/movit/blur_effect.h is in libmovit-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | #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_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) {
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;
};
} // namespace movit
#endif // !defined(_MOVIT_BLUR_EFFECT_H)
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