#include "libptouch_protocol.h"

size_t ptouch_line_payload_bytes(unsigned head_dots)
{
	return (size_t)((head_dots + 7u) / 8u);
}

void ptouch_fill_gf_header(uint8_t out[3], size_t line_payload_bytes)
{
	out[0] = 0x47u;
	out[1] = (uint8_t)(line_payload_bytes & 0xFFu);
	out[2] = (uint8_t)((line_payload_bytes >> 8) & 0xFFu);
}

void ptouch_fill_esc_iz(uint8_t out[13], uint8_t media_kind, uint8_t media_width,
			uint32_t raster_lines)
{
	out[0] = 0x1Bu;
	out[1] = 0x69u;
	out[2] = 0x7Au;
	/* PI flags: enable media/width/length with quality bit for broad compatibility. */
	out[3] = 0x8Eu;
	/* Use status media-kind byte directly (e.g., 0x01 laminated, 0x03 non-laminate). */
	out[4] = media_kind;
	out[5] = media_width;
	out[6] = 0x00u;
	out[7] = (uint8_t)(raster_lines & 0xFFu);
	out[8] = (uint8_t)((raster_lines >> 8) & 0xFFu);
	out[9] = (uint8_t)((raster_lines >> 16) & 0xFFu);
	out[10] = (uint8_t)((raster_lines >> 24) & 0xFFu);
	out[11] = 0x00u; /* first page */
	out[12] = 0x00u; /* fixed */
}

uint8_t ptouch_esc_ik_value(unsigned head_dots)
{
	/* Preserve legacy 560-dot behaviour (0x0C), 128-dot uses 0x08. */
	return head_dots > 128u ? 0x0Cu : 0x08u;
}
