#include "cairoint.h"
static cairo_color_t const cairo_color_white = {
1.0, 1.0, 1.0, 1.0,
0xffff, 0xffff, 0xffff, 0xffff
};
static cairo_color_t const cairo_color_black = {
0.0, 0.0, 0.0, 1.0,
0x0, 0x0, 0x0, 0xffff
};
static cairo_color_t const cairo_color_transparent = {
0.0, 0.0, 0.0, 0.0,
0x0, 0x0, 0x0, 0x0
};
static cairo_color_t const cairo_color_magenta = {
1.0, 0.0, 1.0, 1.0,
0xffff, 0x0, 0xffff, 0xffff
};
const cairo_color_t *
_cairo_stock_color (cairo_stock_t stock)
{
switch (stock) {
case CAIRO_STOCK_WHITE:
return &cairo_color_white;
case CAIRO_STOCK_BLACK:
return &cairo_color_black;
case CAIRO_STOCK_TRANSPARENT:
return &cairo_color_transparent;
}
ASSERT_NOT_REACHED;
return &cairo_color_magenta;
}
void
_cairo_color_init (cairo_color_t *color)
{
*color = cairo_color_white;
}
void
_cairo_color_init_rgb (cairo_color_t *color,
double red, double green, double blue)
{
_cairo_color_init_rgba (color, red, green, blue, 1.0);
}
uint16_t
_cairo_color_double_to_short (double d)
{
uint32_t i;
i = (uint32_t) (d * 65536);
i -= (i >> 16);
return i;
}
static void
_cairo_color_compute_shorts (cairo_color_t *color)
{
color->red_short = _cairo_color_double_to_short (color->red * color->alpha);
color->green_short = _cairo_color_double_to_short (color->green * color->alpha);
color->blue_short = _cairo_color_double_to_short (color->blue * color->alpha);
color->alpha_short = _cairo_color_double_to_short (color->alpha);
}
void
_cairo_color_init_rgba (cairo_color_t *color,
double red, double green, double blue,
double alpha)
{
color->red = red;
color->green = green;
color->blue = blue;
color->alpha = alpha;
_cairo_color_compute_shorts (color);
}
void
_cairo_color_multiply_alpha (cairo_color_t *color,
double alpha)
{
color->alpha *= alpha;
_cairo_color_compute_shorts (color);
}
void
_cairo_color_get_rgba (cairo_color_t *color,
double *red,
double *green,
double *blue,
double *alpha)
{
*red = color->red;
*green = color->green;
*blue = color->blue;
*alpha = color->alpha;
}
void
_cairo_color_get_rgba_premultiplied (cairo_color_t *color,
double *red,
double *green,
double *blue,
double *alpha)
{
*red = color->red * color->alpha;
*green = color->green * color->alpha;
*blue = color->blue * color->alpha;
*alpha = color->alpha;
}
cairo_bool_t
_cairo_color_equal (const cairo_color_t *color_a,
const cairo_color_t *color_b)
{
if (color_a == color_b)
return TRUE;
return color_a->red_short == color_b->red_short &&
color_a->green_short == color_b->green_short &&
color_a->blue_short == color_b->blue_short &&
color_a->alpha_short == color_b->alpha_short;
}