/usr/include/movit/overlay_effect.h is in libmovit-dev 1.6.1-1.
This file is owned by root:root, with mode 0o644.
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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 | #ifndef _MOVIT_OVERLAY_EFFECT_H
#define _MOVIT_OVERLAY_EFFECT_H 1
// Put one image on top of another, using alpha where appropriate.
// (If both images are the same aspect and the top image has alpha=1.0
// for all pixels, you will not see anything of the one on the bottom.)
//
// This is the “over” operation from Porter-Duff blending, also used
// when merging layers in e.g. GIMP or Photoshop.
//
// The first input is the bottom, and the second is the top.
#include <string>
#include "effect.h"
namespace movit {
class OverlayEffect : public Effect {
public:
OverlayEffect();
std::string effect_type_id() const override { return "OverlayEffect"; }
std::string output_fragment_shader() override;
bool needs_srgb_primaries() const override { return false; }
unsigned num_inputs() const override { return 2; }
bool strong_one_to_one_sampling() const override { return true; }
// Actually, if _either_ image has blank alpha, our output will have
// blank alpha, too (this only tells the framework that having _both_
// images with blank alpha would result in blank alpha).
// However, understanding that would require changes
// to EffectChain, so postpone that optimization for later.
AlphaHandling alpha_handling() const override { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
private:
// If true, overlays input1 on top of input2 instead of vice versa.
// Must be set before finalize.
bool swap_inputs;
};
} // namespace movit
#endif // !defined(_MOVIT_OVERLAY_EFFECT_H)
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