/**** Radial Control ****/
struct ImBuf *BKE_brush_gen_radial_control_imbuf(Brush *br, bool secondary)
{
ImBuf *im = MEM_callocN(sizeof(ImBuf), "radial control texture");
unsigned int *texcache;
int side = 128;
int half = side / 2;
int i, j;
curvemapping_initialize(br->curve);
texcache = BKE_brush_gen_texture_cache(br, half, secondary);
im->rect_float = MEM_callocN(sizeof(float) * side * side, "radial control rect");
im->x = im->y = side;
for (i = 0; i < side; ++i) {
for (j = 0; j < side; ++j) {
float magn = sqrtf(pow2f(i - half) + pow2f(j - half));
im->rect_float[i * side + j] = BKE_brush_curve_strength_clamped(br, magn, half);
}
}
/* Modulate curve with texture */
if (texcache) {
for (i = 0; i < side; ++i) {
for (j = 0; j < side; ++j) {
const int col = texcache[i * side + j];
im->rect_float[i * side + j] *= (((char *)&col)[0] + ((char *)&col)[1] + ((char *)&col)[2]) / 3.0f / 255.0f;
}
}
MEM_freeN(texcache);
}
return im;
}
/* create a mask with the falloff strength */
static unsigned short *brush_painter_curve_mask_new(BrushPainter *painter, int diameter, float radius)
{
Brush *brush = painter->brush;
int xoff = -radius;
int yoff = -radius;
unsigned short *mask, *m;
int x, y;
mask = MEM_mallocN(sizeof(unsigned short) * diameter * diameter, "brush_painter_mask");
m = mask;
for (y = 0; y < diameter; y++) {
for (x = 0; x < diameter; x++, m++) {
float xy[2] = {x + xoff, y + yoff};
float len = len_v2(xy);
*m = (unsigned short)(65535.0f * BKE_brush_curve_strength_clamped(brush, len, radius));
}
}
return mask;
}
