/usr/include/movit/padding_effect.h is in libmovit-dev 1.4.0-1.
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 | #ifndef _MOVIT_PADDING_EFFECT_H
#define _MOVIT_PADDING_EFFECT_H 1
// Takes an image and pads it to fit a larger image, or crops it to fit a smaller one
// (although the latter is implemented slightly less efficiently, and you cannot both
// pad and crop in the same effect).
//
// The source image is cut off at the texture border, and then given a user-specific color;
// by default, full transparent. You can give a fractional border size (non-integral
// "top" or "left" offset) if you wish, which will give you linear interpolation of
// both pixel data of and the border. Furthermore, you can offset where the border falls
// by using the "border_offset_{top,bottom,left,right}" settings; this is particularly
// useful if you use ResampleEffect earlier in the chain for high-quality fractional-pixel
// translation and just want PaddingEffect to get the border right.
//
// The border color is taken to be in linear gamma, sRGB, with premultiplied alpha.
// You may not change it after calling finalize(), since that could change the
// graph (need_linear_light() etc. depend on the border color you choose).
//
// IntegralPaddingEffect is like PaddingEffect, except that "top" and "left" parameters
// are int parameters instead of float. This allows it to guarantee one-to-one sampling,
// which can speed up processing by allowing more effect passes to be collapsed.
// border_offset_* are still allowed to be float, although you should beware that if
// you set e.g. border_offset_top to a negative value, you will be sampling outside
// the edge and will read data that is undefined in one-to-one-mode (could be
// edge repeat, could be something else). With regular PaddingEffect, such samples
// are guaranteed to be edge repeat.
#include <epoxy/gl.h>
#include <string>
#include "effect.h"
namespace movit {
class PaddingEffect : public Effect {
public:
PaddingEffect();
virtual std::string effect_type_id() const { return "PaddingEffect"; }
std::string output_fragment_shader();
void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
virtual bool needs_linear_light() const;
virtual bool needs_srgb_primaries() const;
virtual AlphaHandling alpha_handling() const;
virtual bool changes_output_size() const { return true; }
virtual bool sets_virtual_output_size() const { return false; }
virtual void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const;
virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
private:
RGBATuple border_color;
int input_width, input_height;
int output_width, output_height;
float top, left;
float border_offset_top, border_offset_left;
float border_offset_bottom, border_offset_right;
float uniform_offset[2], uniform_scale[2];
float uniform_normalized_coords_to_texels[2];
float uniform_offset_bottomleft[2], uniform_offset_topright[2];
};
class IntegralPaddingEffect : public PaddingEffect {
public:
IntegralPaddingEffect();
virtual std::string effect_type_id() const { return "IntegralPaddingEffect"; }
virtual bool one_to_one_sampling() const { return true; }
virtual bool set_int(const std::string&, int value);
virtual bool set_float(const std::string &key, float value);
};
} // namespace movit
#endif // !defined(_MOVIT_PADDING_EFFECT_H)
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