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).
20 class PaddingEffect : public Effect {
23 virtual std::string effect_type_id() const { return "PaddingEffect"; }
24 std::string output_fragment_shader();
25 void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
27 virtual bool needs_linear_light() const;
28 virtual bool needs_srgb_primaries() const;
29 virtual AlphaHandling alpha_handling() const;
31 virtual bool changes_output_size() const { return true; }
32 virtual void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const;
33 virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
36 RGBATuple border_color;
37 int input_width, input_height;
38 int output_width, output_height;
42 #endif // !defined(_MOVIT_PADDING_EFFECT_H)