ra8_drw_internal.h

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#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_drw.h"

typedef enum : uint16_t {
  k_ra8_drw_internal_byte_mask   = 0x00FFU, 
  k_ra8_drw_internal_one_subpx   = 16U,     
  k_ra8_drw_internal_clut_max    = 256U,    
  k_ra8_drw_internal_dlist_align = 4U,      
  k_ra8_drw_internal_perfev_max  = 0x001FU, 
} ra8_drw_internal_const_t;

typedef enum : uint32_t {
  k_ra8_drw_internal_color_alpha_mask = 0x00FFFFFFUL, 
  k_ra8_drw_internal_align_mask       = 0x00000003UL, 
} ra8_drw_internal_mask32_t;

RA8_INTERNAL static inline uint32_t internal_to_subpixel(int32_t px)
{
  /* Cast to unsigned BEFORE the shift: px can be negative, and left-shifting a
   * negative signed value is undefined behaviour. The two's-complement result
   * is bit-identical to the intended px << 4. */
  return (uint32_t)px << k_ra8_drw_subpixel_shift;
}

RA8_INTERNAL static inline int32_t internal_iabs(int32_t v)
{
  return (v < 0) ? -v : v;
}

RA8_PRIV void priv_program_rect_bbox(const ra8_drw_rect_t* rect);

RA8_PRIV uint32_t priv_ra8_drw_internal_rect_origin(const ra8_drw_rect_t* rect);

RA8_PRIV bool priv_ra8_drw_internal_rect_off_surface(const ra8_drw_rect_t* rect);

RA8_PRIV bool
priv_ra8_drw_internal_rect_below_min(uint16_t min_dim, uint16_t width, uint16_t height);

RA8_PRIV bool priv_ra8_drw_internal_rect_above_max(uint16_t max_w,
                                                   uint16_t max_h,
                                                   uint16_t width,
                                                   uint16_t height);

RA8_PRIV uint32_t priv_ra8_drw_internal_origin(void);

RA8_PRIV void priv_ra8_drw_internal_color1_write(uint32_t argb8888);
 
#ifdef __cplusplus
}
#endif