#include "pixellate2x.hpp"

void Pixellate2xFilter::size(unsigned &outwidth, unsigned &outheight, unsigned width, unsigned height) {
  outwidth  = (width  <= 256) ? width  * 2 : width;
  outheight = (height <= 240) ? height * 2 : height;
}

void Pixellate2xFilter::render(
  uint32_t *output, unsigned outpitch, const uint16_t *input, unsigned pitch,
  const unsigned *line, unsigned width, unsigned height
) {
  pitch >>= 1;
  outpitch >>= 2;

  uint32_t *out0 = output;
  uint32_t *out1 = output + outpitch;

  for(unsigned y = 0; y < height; y++) {
    unsigned linewidth = line[y];
    for(unsigned x = 0; x < linewidth; x++) {
      uint32_t p = colortable[*input++];

      *out0++ = p;
      if(height <= 240) *out1++ = p;
      if(linewidth > 256) continue;

      *out0++ = p;
      if(height <= 240) *out1++ = p;
    }

    input += pitch - linewidth;
    if(height <= 240) {
      out0 += outpitch + outpitch - 512;
      out1 += outpitch + outpitch - 512;
    } else {
      out0 += outpitch - 512;
    }
  }
}
