pixel.h

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#pragma once
 
#include <banjo/api.h>

typedef enum {
    BJ_PIXEL_MODE_UNKNOWN   = 0x00u,       
    BJ_PIXEL_MODE_INDEXED_1 = 0x00000101u, 
    BJ_PIXEL_MODE_INDEXED_4 = 0x00000104u, 
    BJ_PIXEL_MODE_INDEXED_8 = 0x00000108u, 
 
    BJ_PIXEL_MODE_XRGB1555  = 0x01000210u, 
    BJ_PIXEL_MODE_RGB565    = 0x01020210u, 
    BJ_PIXEL_MODE_XRGB8888  = 0x01010220u, 
 
    BJ_PIXEL_MODE_BGR24     = 0x02000318u, 
} bj_pixel_mode;

BANJO_EXPORT void bj_pixel_rgb(
    bj_pixel_mode mode,
    uint32_t      value,
    uint8_t*      p_red,
    uint8_t*      p_green,
    uint8_t*      p_blue
);

BANJO_EXPORT uint32_t bj_pixel_value(
    bj_pixel_mode mode, 
    uint8_t red,
    uint8_t green,
    uint8_t blue
);

BANJO_EXPORT int bj_compute_pixel_mode(
    uint8_t  bpp,
    uint32_t red_mask,
    uint32_t green_mask,
    uint32_t blue_mask
);

BANJO_EXPORT size_t bj_compute_bitmap_stride(
    size_t width,
    bj_pixel_mode mode
);

#define BJ_PIXEL_TYPE_INDEX    0x01
#define BJ_PIXEL_TYPE_BITFIELD 0x02
#define BJ_PIXEL_TYPE_BYTES    0x03

#define BJ_PIXEL_ORDER_RGB  0x01
#define BJ_PIXEL_ORDER_XRGB BJ_PIXEL_ORDER_RGB
#define BJ_PIXEL_ORDER_BGR  0x02
#define BJ_PIXEL_ORDER_XBGR BJ_PIXEL_ORDER_BGR
#define BJ_PIXEL_ORDER_RGBX 0x03
#define BJ_PIXEL_ORDER_BGRX 0x04
#define BJ_PIXEL_ORDER_ARGB 0x05
#define BJ_PIXEL_ORDER_ABGR 0x06
#define BJ_PIXEL_ORDER_RGBA 0x07
#define BJ_PIXEL_ORDER_BGRA 0x08

#define BJ_PIXEL_LAYOUT_1555 0x00
#define BJ_PIXEL_LAYOUT_8888 0x01
#define BJ_PIXEL_LAYOUT_565  0x02

#define BJ_PIXEL_MODE_MAKE(bpp, type, layout, order) (((order & 0xFF) << 24) | ((layout & 0xFF) << 16) | ((type & 0xFF) << 8) | (bpp & 0xFF))

#define BJ_PIXEL_MODE_MAKE_INDEXED(bpp)               BJ_PIXEL_MODE_MAKE(bpp, BJ_PIXEL_TYPE_INDEX, 0, 0)

#define BJ_PIXEL_MODE_MAKE_BITFIELD_16(layout, order) BJ_PIXEL_MODE_MAKE(16, BJ_PIXEL_TYPE_BITFIELD, layout, order)

#define BJ_PIXEL_MODE_MAKE_BITFIELD_32(layout, order) BJ_PIXEL_MODE_MAKE(32, BJ_PIXEL_TYPE_BITFIELD, layout, order)

#define BJ_PIXEL_MODE_MAKE_BYTES(bpp, order)          BJ_PIXEL_MODE_MAKE(bpp, BJ_PIXEL_TYPE_BYTES, 0, order)

#define BJ_PIXEL_GET_BPP(fmt)    ((fmt) & 0xFF)

#define BJ_PIXEL_GET_TYPE(fmt)   (((fmt) >> 8) & 0xFF)

#define BJ_PIXEL_GET_LAYOUT(fmt) (((fmt) >> 16) & 0xFF)

#define BJ_PIXEL_GET_ORDER(fmt)  (((fmt) >> 24) & 0xFF)