1 #ifndef _MOVIT_PADDING_EFFECT_H
2 #define _MOVIT_PADDING_EFFECT_H 1
4 // Takes an image and pads it to fit a larger image, or crops it to fit a smaller one
5 // (although the latter is implemented slightly less efficiently, and you cannot both
6 // pad and crop in the same effect).
8 // The source image is cut off at the texel borders (so there is no interpolation
9 // outside them), and then given a user-specific color; by default, full transparent.
11 // The border color is taken to be in linear gamma, sRGB, with premultiplied alpha.
12 // You may not change it after calling finalize(), since that could change the
13 // graph (need_linear_light() etc. depend on the border color you choose).
15 // As a convenience, if the flag “pad_from_bottom” is nonzero, the “top” parameter
16 // will mean pixels from the bottom (matching OpenGL's usual bottom-left convention),
17 // instead of from the top as usual.
26 class PaddingEffect : public Effect {
29 virtual std::string effect_type_id() const { return "PaddingEffect"; }
30 std::string output_fragment_shader();
31 void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
33 virtual bool needs_linear_light() const;
34 virtual bool needs_srgb_primaries() const;
35 virtual AlphaHandling alpha_handling() const;
37 virtual bool changes_output_size() const { return true; }
38 virtual void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const;
39 virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
42 RGBATuple border_color;
43 int input_width, input_height;
44 int output_width, output_height;
51 #endif // !defined(_MOVIT_PADDING_EFFECT_H)