diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/libnsfb.h | 1 | ||||
| -rw-r--r-- | include/nsfb.h | 2 | ||||
| -rw-r--r-- | include/palette.h | 111 |
3 files changed, 113 insertions, 1 deletions
diff --git a/include/libnsfb.h b/include/libnsfb.h index 739617e..da8e5f6 100644 --- a/include/libnsfb.h +++ b/include/libnsfb.h @@ -13,6 +13,7 @@ #include <stdint.h> +typedef struct nsfb_palette_s nsfb_palette_t; typedef struct nsfb_cursor_s nsfb_cursor_t; typedef struct nsfb_s nsfb_t; typedef struct nsfb_event_s nsfb_event_t; diff --git a/include/nsfb.h b/include/nsfb.h index 5caff9b..9a61775 100644 --- a/include/nsfb.h +++ b/include/nsfb.h @@ -28,7 +28,7 @@ struct nsfb_s { uint8_t *ptr; /**< Base of video memory. */ int linelen; /**< length of a video line. */ - nsfb_colour_t palette[256]; /**< palette for index modes */ + struct nsfb_palette_s *palette; /**< palette for index modes */ nsfb_cursor_t *cursor; /**< cursor */ struct nsfb_surface_rtns_s *surface_rtns; /**< surface routines. */ diff --git a/include/palette.h b/include/palette.h new file mode 100644 index 0000000..845c1bc --- /dev/null +++ b/include/palette.h @@ -0,0 +1,111 @@ +/* + * Copyright 2012 Michael Drake <tlsa@netsurf-browser.org> + * + * This file is part of libnsfb, http://www.netsurf-browser.org/ + * Licenced under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + * + * This is the *internal* interface for the cursor. + */ + +#ifndef PALETTE_H +#define PALETTE_H 1 + +#include <stdint.h> +#include <limits.h> + +#include "libnsfb.h" +#include "libnsfb_plot.h" + +enum nsfb_palette_type_e { + NSFB_PALETTE_EMPTY, /**< empty palette object */ + NSFB_PALETTE_NSFB_8BPP, /**< libnsfb's own 8bpp palette */ + NSFB_PALETTE_OTHER /**< any other palette */ +}; + +struct nsfb_palette_s { + enum nsfb_palette_type_e type; /**< Palette type */ + uint8_t last; /**< Last used palette index */ + nsfb_colour_t data[256]; /**< Palette for index modes */ +}; + +/** Create an empty palette object. */ +bool nsfb_palette_new(struct nsfb_palette_s **palette); + +/** Free a palette object. */ +void nsfb_palette_free(struct nsfb_palette_s *palette); + +/** Generate libnsfb 8bpp default palette. */ +void nsfb_palette_generate_nsfb_8bpp(struct nsfb_palette_s *palette); + + +static inline uint8_t nsfb_palette_best_match( + const struct nsfb_palette_s *palette, + nsfb_colour_t c) +{ + uint8_t best_col = 0; + + nsfb_colour_t palent; + int col; + int dr, dg, db; /* delta red, green blue values */ + + int cur_distance; + int best_distance = INT_MAX; + + switch (palette->type) { + case NSFB_PALETTE_NSFB_8BPP: + /* Index into colour cube part */ + dr = ((( c & 0xFF) * 5) + 128) / 256; + dg = ((((c >> 8) & 0xFF) * 7) + 128) / 256; + db = ((((c >> 16) & 0xFF) * 4) + 128) / 256; + col = 40 * dr + 5 * dg + db; + + palent = palette->data[col]; + dr = ( c & 0xFF) - ( palent & 0xFF); + dg = ((c >> 8) & 0xFF) - ((palent >> 8 ) & 0xFF); + db = ((c >> 16) & 0xFF) - ((palent >> 16) & 0xFF); + cur_distance = (dr * dr) + (dg * dg) + (db * db); + + best_col = col; + best_distance = cur_distance; + + /* Index into grayscale part */ + col = (( c & 0xFF) + + ((c >> 8) & 0xFF) + + ((c >> 16) & 0xFF) + (45 / 2)) / (15 * 3) - 1 + 240; + palent = palette->data[col]; + + dr = ( c & 0xFF) - ( palent & 0xFF); + dg = ((c >> 8) & 0xFF) - ((palent >> 8) & 0xFF); + db = ((c >> 16) & 0xFF) - ((palent >> 16) & 0xFF); + cur_distance = (dr * dr) + (dg * dg) + (db * db); + if (cur_distance < best_distance) { + best_distance = cur_distance; + best_col = col; + } + break; + + case NSFB_PALETTE_OTHER: + /* Try all colours in palette */ + for (col = 0; col <= palette->last; col++) { + palent = palette->data[col]; + + dr = ( c & 0xFF) - ( palent & 0xFF); + dg = ((c >> 8) & 0xFF) - ((palent >> 8) & 0xFF); + db = ((c >> 16) & 0xFF) - ((palent >> 16) & 0xFF); + cur_distance = (dr * dr) + (dg * dg) + (db * db); + if (cur_distance < best_distance) { + best_distance = cur_distance; + best_col = col; + } + } + break; + + default: + break; + } + + return best_col; +} + +#endif /* PALETTE_H */ |