/*
Calculate a RGB palette out of VIC/VIC-II/TED colors (in ycbcr format),
apply saturation, brightness, contrast, tint and gamma settings.
this palette will be used for screenshots and by renderers if CRT emulation
is disabled.
*/
static palette_t *video_calc_palette(struct video_canvas_s *canvas, const video_ycbcr_palette_t *p)
{
palette_t *prgb;
unsigned int i;
float sat, bri, con, gam, tin;
video_resources_t *video_resources = &(canvas->videoconfig->video_resources);
DBG(("video_calc_palette"));
sat = ((float)(video_resources->color_saturation)) / 1000.0f;
bri = ((float)(video_resources->color_brightness - 1000)) * (128.0f / 1000.0f);
con = ((float)(video_resources->color_contrast)) / 1000.0f;
gam = video_get_gamma(video_resources);
tin = (((float)(video_resources->color_tint)) / (2000.0f / 50.0f)) - 25.0f;
/* create RGB palette with the base colors of the video chip */
prgb = palette_create(p->num_entries, NULL);
if (prgb == NULL) {
return NULL;
}
for (i = 0; i < p->num_entries; i++) {
video_convert_ycbcr_to_rgb(&p->entries[i], sat, bri, con, gam, tin,
&prgb->entries[i]);
}
return prgb;
}
/* conversion of YCbCr to RGB
used by video_calc_palette (internal palette) (not used by CRT emu)
*/
static void video_convert_renderer_to_rgb_gamma(video_ycbcr_color_t *src, float sat,
float bri, float con, float gam, float tin,
palette_entry_t *dst, int video)
{
float rf, bf, gf;
double factor;
int r, g, b;
video_ycbcr_color_t tmp;
/* DBG(("video_convert_renderer_to_rgb_gamma")); */
tmp.cb = src->cb;
tmp.cr = src->cr;
tmp.y = src->y;
if (video) {
tmp.cr += tin; /* apply tint */
/* apply saturation */
tmp.cb *= sat;
tmp.cr *= sat;
video_convert_ycbcr_to_rgb(&tmp, &r, &g, &b);
} else {
/* FIXME: tint for ntsc */
tmp.cr += tin; /* apply tint */
/* apply saturation */
tmp.cb *= sat;
tmp.cr *= sat;
video_convert_yiq_to_rgb(&tmp, &r, &g, &b);
}
/* do gamma correction */
factor = pow(255.0f, 1.0f - gam);
rf = video_gamma((float)r, factor, gam, bri, con);
gf = video_gamma((float)g, factor, gam, bri, con);
bf = video_gamma((float)b, factor, gam, bri, con);
/* convert to int and clip to 8 bit boundaries */
r = (int)rf;
g = (int)gf;
b = (int)bf;
dst->dither = 0;
dst->red = (BYTE)RMAX(r,255);
dst->green = (BYTE)RMAX(g,255);
dst->blue = (BYTE)RMAX(b,255);
dst->name = NULL;
}
static void video_convert_renderer_to_rgb(video_ycbcr_color_t *src,
palette_entry_t *dst, int video)
{
int r, g, b;
/* DBG(("video_convert_renderer_to_rgb")); */
if (video) {
/* PAL */
video_convert_ycbcr_to_rgb(src, &r, &g, &b);
} else {
/* NTSC */
video_convert_yiq_to_rgb(src, &r, &g, &b);
}
dst->dither = 0;
dst->red = (BYTE)r;
dst->green = (BYTE)g;
dst->blue = (BYTE)b;
dst->name = NULL;
}
