gp_pattern_fill.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2025 Cyril Hrubis <metan@ucw.cz>
 */
 
#ifndef CORE_GP_PATTERN_FILL_H
#define CORE_GP_PATTERN_FILL_H
 
#include <core/gp_types.h>
#include <stdbool.h>
 
enum gp_pixel_pattern {
        GP_PIXEL_PATTERN_NONE = 0x00,
 
        GP_PIXEL_PATTERN_50 = 0x01,
 
        GP_PIXEL_PATTERN_ASC_25 = 0x02,
 
        GP_PIXEL_PATTERN_DSC_25 = 0x03,
 
        GP_PIXEL_PATTERN_ASC_75 = 0x04,
 
        GP_PIXEL_PATTERN_DSC_75 = 0x05,
 
        GP_PIXEL_PATTERN_DOTS_12_5 = 0x06,
 
        GP_PIXEL_PATTERN_DOTS_25 = 0x07,
 
        GP_PIXEL_PATTERN_DOTS_75 = 0x08,
 
        GP_PIXEL_PATTERN_DOTS_87_5 = 0x09,
};
 
#define GP_PIXEL_PATTERN_CNT 10
 
#define GP_PIXEL_PATTERN_MASK 0x0f00
 
#define GP_PIXEL_PATTERN_SHIFT 8
 
#define GP_PIXEL_PATTERN_FG_MASK 0x000f
 
#define GP_PIXEL_PATTERN_FG_SHIFT 0
 
#define GP_PIXEL_PATTERN_BG_MASK 0x00f0
 
#define GP_PIXEL_PATTERN_BG_SHIFT 4
 
static inline enum gp_pixel_pattern gp_pixel_pattern_get(gp_pixel pixel)
{
        return (pixel & GP_PIXEL_PATTERN_MASK)>>GP_PIXEL_PATTERN_SHIFT;
}
 
static inline gp_pixel gp_pixel_pattern_fg_get(gp_pixel pixel)
{
        return (pixel & GP_PIXEL_PATTERN_FG_MASK) >> GP_PIXEL_PATTERN_FG_SHIFT;
}
 
static inline gp_pixel gp_pixel_pattern_bg_get(gp_pixel pixel)
{
        return (pixel & GP_PIXEL_PATTERN_BG_MASK) >> GP_PIXEL_PATTERN_BG_SHIFT;
}
 
static inline gp_pixel gp_pixel_pattern(uint8_t fg_color, uint8_t bg_color, enum gp_pixel_pattern pattern)
{
        if (fg_color == bg_color)
                return fg_color;
 
        return (GP_PIXEL_PATTERN_FG_MASK & (fg_color << GP_PIXEL_PATTERN_FG_SHIFT)) |
               (GP_PIXEL_PATTERN_BG_MASK & (bg_color << GP_PIXEL_PATTERN_BG_SHIFT)) |
               (GP_PIXEL_PATTERN_MASK & (pattern<<GP_PIXEL_PATTERN_SHIFT));
}
 
#define GP_PIXEL_PATTERN_W 4
 
#define GP_PIXEL_PATTERN_H 4
 
extern uint8_t *gp_pixel_pattern_lookup_table[GP_PIXEL_PATTERN_CNT];
 
static inline uint8_t *gp_pixel_pattern_lookup_table_get(enum gp_pixel_pattern pattern)
{
        return gp_pixel_pattern_lookup_table[pattern];
}
 
static inline gp_pixel gp_pixel_pattern_pixel_get(uint8_t *lookup, gp_pixel fg, gp_pixel bg,
                                                  uint8_t x_mod, uint8_t y_mod)
{
        return lookup[y_mod] & (8>>x_mod) ? fg : bg;
}
 
#endif /* CORE_GP_PATTERN_FILL_H */