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Add palette find function.

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This commit is contained in:
Michael Jumper 2012-04-01 21:57:19 -07:00
parent e22323c4d9
commit 314e8c9222
2 changed files with 28 additions and 0 deletions
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1
libguac/include/palette.h
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@ -56,6 +56,7 @@ typedef struct guac_palette {
} guac_palette; } guac_palette;
guac_palette* guac_palette_alloc(cairo_surface_t* surface); guac_palette* guac_palette_alloc(cairo_surface_t* surface);
int guac_palette_find(guac_palette* palette, int color);
void guac_palette_free(guac_palette* palette); void guac_palette_free(guac_palette* palette);
#endif #endif

27
libguac/src/palette.c
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@ -111,6 +111,33 @@ guac_palette* guac_palette_alloc(cairo_surface_t* surface) {
} }
int guac_palette_find(guac_palette* palette, int color) {
/* Calculate hash code */
int hash = ((color & 0xFFF000) >> 12) ^ (color & 0xFFF);
guac_palette_entry* entry;
/* Search for palette entry */
for (;;) {
entry = &(palette->entries[hash]);
/* If we've found a free space, color not stored. */
if (entry->index == 0)
return -1;
/* Otherwise, if color indeed stored here, done */
if (entry->color == color)
return entry->index;
/* Otherwise, collision. Move on to another bucket */
hash = (hash+1) & 0xFFF;
}
}
void guac_palette_free(guac_palette* palette) { void guac_palette_free(guac_palette* palette) {
free(palette); free(palette);
} }