#define COLOR_WHITE color_new(S(1.0), S(1.0), S(1.0), S(1.0))
+/*
+ * Get a pointer to the color data.
+ */
+INLINE_MAYBE
+const scal_t* color_data(const color_t* c)
+{
+ return &c->r;
+}
+
+
/*
* Print the color to stdout.
*/
INLINE_MAYBE
color_t color_add(color_t c1, color_t c2)
{
- return color_new(c1.r + c2.r, c1.g + c2.g, c1.b + c2.b, c1.a + c2.a);
+ return color_new(c1.r + c2.r, c1.g + c2.g, c1.b + c2.b, c1.a);
}
/*
c1.r *= c2.r;
c1.g *= c2.g;
c1.b *= c2.b;
- c1.a *= c2.a;
return c1;
}
c.r *= k;
c.g *= k;
c.b *= k;
- c.a *= k;
return c;
}
return color_scale(color_mult(c1, c2), k);
}
+INLINE_MAYBE
+color_t color_blend(color_t d, color_t s)
+{
+ d.r = (S(1.0) - s.a) * d.r + s.a * s.r;
+ d.g = (S(1.0) - s.a) * d.g + s.a * s.g;
+ d.b = (S(1.0) - s.a) * d.b + s.a * s.b;
+ return d;
+}
+
/*
* Clamp a color's channels to the normal range of 0.0 to 1.0.
*/
{
return color_new(c1.r * (S(1.0) - a) + c2.r * a,
c1.g * (S(1.0) - a) + c2.g * a,
- c1.b * (S(1.0) - a) + c2.b * a,
- c1.a * (S(1.0) - a) + c2.a * a);
+ c1.b * (S(1.0) - a) + c2.b * a, c1.a);
}
/*
{
return color_new(c1.r * b[0] + c2.r * b[1] + c3.r * b[2],
c1.g * b[0] + c2.g * b[1] + c3.g * b[2],
- c1.b * b[0] + c2.b * b[1] + c3.b * b[2],
- S(1.0));
+ c1.b * b[0] + c2.b * b[1] + c3.b * b[2], c1.a);
}
typedef uint8_t rgbachan_t;
typedef uint32_t rgba_t;
-/*
- * Create a new color from a 32-bit RGBA value.
- */
-INLINE_MAYBE
-color_t color_from_rgba(rgba_t n)
-{
- colorchan_t r = (colorchan_t)UNPACK(n, 3) / S(255.0);
- colorchan_t g = (colorchan_t)UNPACK(n, 2) / S(255.0);
- colorchan_t b = (colorchan_t)UNPACK(n, 1) / S(255.0);
- colorchan_t a = (colorchan_t)UNPACK(n, 0) / S(255.0);
- return color_new(r, g, b, a);
-}
-
/*
* Split a color into 8-bit RGBA channels.
*/
if (a) *a = (rgbachan_t)(c.a * S(255.0));
}
+/*
+ * Create a new color from a 32-bit RGBA value.
+ */
+INLINE_MAYBE
+color_t color_from_rgba(rgba_t n)
+{
+ union {
+ rgba_t rgba;
+ struct {
+ rgbachan_t r, g, b, a;
+ } chan;
+ } u;
+ u.rgba = n;
+ colorchan_t r = (colorchan_t)u.chan.r / S(255.0);
+ colorchan_t g = (colorchan_t)u.chan.g / S(255.0);
+ colorchan_t b = (colorchan_t)u.chan.b / S(255.0);
+ colorchan_t a = (colorchan_t)u.chan.a / S(255.0);
+ return color_new(r, g, b, a);
+}
+
/*
* Convert a color to a 32-bit RGBA value.
*/
INLINE_MAYBE
rgba_t rgba_from_color(color_t c)
{
- rgbachan_t r, g, b, a;
- color_split(c, &r, &g, &b, &a);
- return ((rgba_t)r << 24) | ((rgba_t)g << 16) | ((rgba_t)b << 8) | (rgba_t)a;
+ union {
+ rgba_t rgba;
+ struct {
+ rgbachan_t r, g, b, a;
+ } chan;
+ } u;
+ color_split(c, &u.chan.r, &u.chan.g, &u.chan.b, &u.chan.a);
+ return u.rgba;
}