/**
 * @file lv_font.c
 *
 */

/*********************
 *      INCLUDES
 *********************/

#include "lv_font.h"
#include "../misc/lv_utils.h"
#include "../misc/lv_log.h"
#include "../misc/lv_assert.h"

/*********************
 *      DEFINES
 *********************/

/**********************
 *      TYPEDEFS
 **********************/

/**********************
 *  STATIC PROTOTYPES
 **********************/

/**********************
 *  STATIC VARIABLES
 **********************/

/**********************
 * GLOBAL PROTOTYPES
 **********************/

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

const uint8_t * lv_font_get_glyph_bitmap(const lv_font_t * font_p, uint32_t letter, uint8_t * buf_out)
{
    LV_ASSERT_NULL(font_p);
    return font_p->get_glyph_bitmap(font_p, letter, buf_out);
}

bool lv_font_get_glyph_dsc(const lv_font_t * font_p, lv_font_glyph_dsc_t * dsc_out, uint32_t letter,
                           uint32_t letter_next)
{

    LV_ASSERT_NULL(font_p);
    LV_ASSERT_NULL(dsc_out);

#if LV_USE_FONT_PLACEHOLDER
    const lv_font_t * placeholder_font = NULL;
#endif

    const lv_font_t * f = font_p;

    dsc_out->resolved_font = NULL;

    while(f) {
        bool found = f->get_glyph_dsc(f, dsc_out, letter, f->kerning == LV_FONT_KERNING_NONE ? 0 : letter_next);
        if(found) {
            if(!dsc_out->is_placeholder) {
                dsc_out->resolved_font = f;
                return true;
            }
#if LV_USE_FONT_PLACEHOLDER
            else if(placeholder_font == NULL) {
                placeholder_font = f;
            }
#endif
        }
        f = f->fallback;
    }

#if LV_USE_FONT_PLACEHOLDER
    if(placeholder_font != NULL) {
        placeholder_font->get_glyph_dsc(placeholder_font, dsc_out, letter,
                                        placeholder_font->kerning == LV_FONT_KERNING_NONE ? 0 : letter_next);
        dsc_out->resolved_font = placeholder_font;
        return true;
    }
#endif

    if(letter < 0x20 ||
       letter == 0xf8ff || /*LV_SYMBOL_DUMMY*/
       letter == 0x200c) { /*ZERO WIDTH NON-JOINER*/
        dsc_out->box_w = 0;
        dsc_out->adv_w = 0;
    }
    else {
#if LV_USE_FONT_PLACEHOLDER
        dsc_out->box_w = font_p->line_height / 2;
        dsc_out->adv_w = dsc_out->box_w + 2;
#else
        dsc_out->box_w = 0;
        dsc_out->adv_w = 0;
#endif
    }

    dsc_out->resolved_font = NULL;
    dsc_out->box_h = font_p->line_height;
    dsc_out->ofs_x = 0;
    dsc_out->ofs_y = 0;
    dsc_out->bpp   = 1;
    dsc_out->is_placeholder = true;

    return false;
}

uint16_t lv_font_get_glyph_width(const lv_font_t * font, uint32_t letter, uint32_t letter_next)
{
    LV_ASSERT_NULL(font);
    lv_font_glyph_dsc_t g;
    lv_font_get_glyph_dsc(font, &g, letter, letter_next);
    return g.adv_w;
}

void lv_font_set_kerning(lv_font_t * font, lv_font_kerning_t kerning)
{
    LV_ASSERT_NULL(font);
    font->kerning = kerning;
}

/**********************
 *   STATIC FUNCTIONS
 **********************/
