+ // Note that if we did error diffusion, we'd actually want to diffuse the
+ // premultiplied error. However, we need to do dithering in the same
+ // space as quantization, whether that be pre- or postmultiply.
+ AlphaHandling alpha_handling() const override { return DONT_CARE_ALPHA_TYPE; }
+ bool strong_one_to_one_sampling() const override { return true; }
+
+ void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;