X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=padding_effect.h;fp=padding_effect.h;h=e9d4ce71607d2b900428884193b34d5627af9cb9;hp=0000000000000000000000000000000000000000;hb=eddc371976d7586176a74503ec9896159ececa43;hpb=524148c91130cbbe1a506eb9c268750dba74cb95

diff --git a/padding_effect.h b/padding_effect.h
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+++ b/padding_effect.h
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+#ifndef _PADDING_EFFECT_H
+#define _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 texel borders (so there is no interpolation
+// outside them), and then given a user-specific color; by default, full transparent.
+//
+// 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).
+
+#include "effect.h"
+
+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 void get_output_size(unsigned *width, unsigned *height) const;
+	virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
+
+private:
+	RGBATriplet border_color;
+	int input_width, input_height;
+	int output_width, output_height;
+	float top, left;
+};
+
+#endif // !defined(_PADDING_EFFECT_H)