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path: root/source/blender/blenlib/intern/math_color.c
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Diffstat (limited to 'source/blender/blenlib/intern/math_color.c')
-rw-r--r--source/blender/blenlib/intern/math_color.c221
1 files changed, 60 insertions, 161 deletions
diff --git a/source/blender/blenlib/intern/math_color.c b/source/blender/blenlib/intern/math_color.c
index 57a48bb5fa8..3ed7230b1d2 100644
--- a/source/blender/blenlib/intern/math_color.c
+++ b/source/blender/blenlib/intern/math_color.c
@@ -37,112 +37,38 @@
void hsv_to_rgb(float h, float s, float v, float *r, float *g, float *b)
{
- if (s != 0.0f) {
- float i, f, p;
- h = (h - floorf(h)) * 6.0f;
-
- i = floorf(h);
- f = h - i;
-
- /* avoid computing q/t when not needed */
- p = (v * (1.0f - s));
-#define q (v * (1.0f - (s * f)))
-#define t (v * (1.0f - (s * (1.0f - f))))
-
- /* faster to compare floats then int conversion */
- if (i < 1.0f) {
- *r = v;
- *g = t;
- *b = p;
- }
- else if (i < 2.0f) {
- *r = q;
- *g = v;
- *b = p;
- }
- else if (i < 3.0f) {
- *r = p;
- *g = v;
- *b = t;
- }
- else if (i < 4.0f) {
- *r = p;
- *g = q;
- *b = v;
- }
- else if (i < 5.0f) {
- *r = t;
- *g = p;
- *b = v;
- }
- else {
- *r = v;
- *g = p;
- *b = q;
- }
+ float nr, ng, nb;
-#undef q
-#undef t
+ nr = fabsf(h * 6.0f - 3.0f) - 1.0f;
+ ng = 2.0f - fabsf(h * 6.0f - 2.0f);
+ nb = 2.0f - fabsf(h * 6.0f - 4.0f);
- }
- else {
- *r = v;
- *g = v;
- *b = v;
- }
+ CLAMP(nr, 0.0f, 1.0f);
+ CLAMP(nb, 0.0f, 1.0f);
+ CLAMP(ng, 0.0f, 1.0f);
+
+ *r = ((nr - 1.0f) * s + 1.0f) * v;
+ *g = ((ng - 1.0f) * s + 1.0f) * v;
+ *b = ((nb - 1.0f) * s + 1.0f) * v;
}
-/* HSL to rgb conversion from https://en.wikipedia.org/wiki/HSL_and_HSV */
void hsl_to_rgb(float h, float s, float l, float *r, float *g, float *b)
{
- float i, f, c;
- h = (h - floorf(h)) * 6.0f;
- c = (l > 0.5f) ? (2.0f * (1.0f - l) * s) : (2.0f * l * s);
- i = floorf(h);
- f = h - i;
+ float nr, ng, nb, chroma;
-#define x2 (c * f)
-#define x1 (c * (1.0f - f))
+ nr = fabsf(h * 6.0f - 3.0f) - 1.0f;
+ ng = 2.0f - fabsf(h * 6.0f - 2.0f);
+ nb = 2.0f - fabsf(h * 6.0f - 4.0f);
- /* faster to compare floats then int conversion */
- if (i < 1.0f) {
- *r = c;
- *g = x2;
- *b = 0;
- }
- else if (i < 2.0f) {
- *r = x1;
- *g = c;
- *b = 0;
- }
- else if (i < 3.0f) {
- *r = 0;
- *g = c;
- *b = x2;
- }
- else if (i < 4.0f) {
- *r = 0;
- *g = x1;
- *b = c;
- }
- else if (i < 5.0f) {
- *r = x2;
- *g = 0;
- *b = c;
- }
- else {
- *r = c;
- *g = 0;
- *b = x1;
- }
+ CLAMP(nr, 0.0f, 1.0f);
+ CLAMP(nb, 0.0f, 1.0f);
+ CLAMP(ng, 0.0f, 1.0f);
-#undef x1
-#undef x2
+ chroma = (1.0f - fabsf(2.0f * l - 1.0f)) * s;
- f = l - 0.5f * c;
- *r += f;
- *g += f;
- *b += f;
+ *r = (nr - 0.5f) * chroma + l;
+ *g = (ng - 0.5f) * chroma + l;
+ *b = (nb - 0.5f) * chroma + l;
}
/* convenience function for now */
@@ -152,9 +78,9 @@ void hsv_to_rgb_v(const float hsv[3], float r_rgb[3])
}
/* convenience function for now */
-void hsl_to_rgb_v(const float hcl[3], float r_rgb[3])
+void hsl_to_rgb_v(const float hsl[3], float r_rgb[3])
{
- hsl_to_rgb(hcl[0], hcl[1], hcl[2], &r_rgb[0], &r_rgb[1], &r_rgb[2]);
+ hsl_to_rgb(hsl[0], hsl[1], hsl[2], &r_rgb[0], &r_rgb[1], &r_rgb[2]);
}
void rgb_to_yuv(float r, float g, float b, float *ly, float *lu, float *lv)
@@ -187,7 +113,7 @@ void yuv_to_rgb(float y, float u, float v, float *lr, float *lg, float *lb)
void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr, int colorspace)
{
float sr, sg, sb;
- float y = 128.f, cr = 128.f, cb = 128.f;
+ float y = 128.0f, cr = 128.0f, cb = 128.0f;
sr = 255.0f * r;
sg = 255.0f * g;
@@ -226,7 +152,7 @@ void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr, in
/* FIXME comment above must be wrong because BLI_YCC_ITU_BT601 y 16.0 cr 16.0 -> r -0.7009 */
void ycc_to_rgb(float y, float cb, float cr, float *lr, float *lg, float *lb, int colorspace)
{
- float r = 128.f, g = 128.f, b = 128.f;
+ float r = 128.0f, g = 128.0f, b = 128.0f;
switch (colorspace) {
case BLI_YCC_ITU_BT601:
@@ -284,57 +210,26 @@ void hex_to_rgb(char *hexcol, float *r, float *g, float *b)
void rgb_to_hsv(float r, float g, float b, float *lh, float *ls, float *lv)
{
- float h, s, v;
- float cmax, cmin;
-
- cmax = r;
- cmin = r;
- cmax = (g > cmax ? g : cmax);
- cmin = (g < cmin ? g : cmin);
- cmax = (b > cmax ? b : cmax);
- cmin = (b < cmin ? b : cmin);
-
- v = cmax; /* value */
- if (cmax != 0.0f) {
- float cdelta;
-
- cdelta = cmax - cmin;
- s = cdelta / cmax;
-
- if (s != 0.0f) {
- float rc, gc, bc;
-
- rc = (cmax - r) / cdelta;
- gc = (cmax - g) / cdelta;
- bc = (cmax - b) / cdelta;
-
- if (r == cmax) {
- h = bc - gc;
- if (h < 0.0f) {
- h += 6.0f;
- }
- }
- else if (g == cmax) {
- h = 2.0f + rc - bc;
- }
- else {
- h = 4.0f + gc - rc;
- }
-
- h *= (1.0f / 6.0f);
- }
- else {
- h = 0.0f;
- }
+ float k = 0.0f;
+ float chroma;
+ float min_gb;
+
+ if (g < b) {
+ SWAP(float, g, b);
+ k = -1.0f;
}
- else {
- h = 0.0f;
- s = 0.0f;
+ min_gb = b;
+ if (r < g) {
+ SWAP(float, r, g);
+ k = -2.0f / 6.0f - k;
+ min_gb = min_ff(g, b);
}
- *lh = h;
- *ls = s;
- *lv = v;
+ chroma = r - min_gb;
+
+ *lh = fabsf(k + (g - b) / (6.0f * chroma + 1e-20f));
+ *ls = chroma / (r + 1e-20f);
+ *lv = r;
}
/* convenience function for now */
@@ -374,8 +269,8 @@ void rgb_to_hsl(float r, float g, float b, float *lh, float *ls, float *ll)
void rgb_to_hsl_compat(float r, float g, float b, float *lh, float *ls, float *ll)
{
- float orig_s = *ls;
- float orig_h = *lh;
+ const float orig_s = *ls;
+ const float orig_h = *lh;
rgb_to_hsl(r, g, b, lh, ls, ll);
@@ -407,8 +302,8 @@ void rgb_to_hsl_v(const float rgb[3], float r_hsl[3])
void rgb_to_hsv_compat(float r, float g, float b, float *lh, float *ls, float *lv)
{
- float orig_h = *lh;
- float orig_s = *ls;
+ const float orig_h = *lh;
+ const float orig_s = *ls;
rgb_to_hsv(r, g, b, lh, ls, lv);
@@ -703,11 +598,12 @@ static float index_to_float(const unsigned short i)
void BLI_init_srgb_conversion(void)
{
- static int initialized = 0;
+ static bool initialized = false;
unsigned int i, b;
- if (initialized) return;
- initialized = 1;
+ if (initialized)
+ return;
+ initialized = true;
/* Fill in the lookup table to convert floats to bytes: */
for (i = 0; i < 0x10000; i++) {
@@ -736,6 +632,9 @@ static float inverse_srgb_companding(float v)
}
}
+/**
+ * \note Does sRGB to linear conversion
+ */
void rgb_to_xyz(float r, float g, float b, float *x, float *y, float *z)
{
r = inverse_srgb_companding(r) * 100.0f;
@@ -762,13 +661,13 @@ static float xyz_to_lab_component(float v)
void xyz_to_lab(float x, float y, float z, float *l, float *a, float *b)
{
- float xr = x / 95.047f;
- float yr = y / 100.0f;
- float zr = z / 108.883f;
+ const float xr = x / 95.047f;
+ const float yr = y / 100.0f;
+ const float zr = z / 108.883f;
- float fx = xyz_to_lab_component(xr);
- float fy = xyz_to_lab_component(yr);
- float fz = xyz_to_lab_component(zr);
+ const float fx = xyz_to_lab_component(xr);
+ const float fy = xyz_to_lab_component(yr);
+ const float fz = xyz_to_lab_component(zr);
*l = 116.0f * fy - 16.0f;
*a = 500.0f * (fx - fy);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-18 07:26:45 +0300