Function nsvg__createGradient

rEFIt_UEFI/libeg/nanosvg.cpp:810–907

static void nsvg__getLocalBounds(float* bounds, NSVGshape *shape); //, float* xform);

static NSVGgradient* nsvg__createGradient(NSVGparser* p, NSVGshape* shape, NSVGgradientLink* link, char* paintType)
{
  //  NSVGattrib* attr = nsvg__getAttr(p);
  NSVGgradientData* data = NULL;
  NSVGgradientData* ref = NULL;
  NSVGgradientStop* stops = NULL;
  NSVGgradient* grad;
  float ox, oy, sw, sh, sl;
  int nstops = 0;

  if (!link) {
    *paintType = NSVG_PAINT_NONE;
    return NULL;
  }
  data = nsvg__findGradientData(p, link->id);
  if (data == NULL) return NULL;
  //  DumpFloat2("gradient data xform:", data->xform, 6);
  stops = data->stops;
  nstops = data->nstops;
  ref = nsvg__findGradientData(p, data->ref);
  while (ref != NULL) {
    if (stops == NULL && ref->stops != NULL) { //take stops only once at first occuerence
      stops = ref->stops;
      nstops = ref->nstops;
    }
    //left referenced, right is current,
    // matrix are reversed
    nsvg__xformPremultiply(data->xform, ref->xform);
    ref = nsvg__findGradientData(p, ref->ref); //recursive refs?
  }
  if (stops == NULL) return NULL;
  //  DumpFloat2("gradient final xform:", data->xform, 6);
  grad = (NSVGgradient*)AllocateZeroPool(sizeof(NSVGgradient) + sizeof(NSVGgradientStop)*(nstops-1));
  if (grad == NULL) return NULL;
  // The shape width and height.
  if (data->units == NSVG_OBJECT_SPACE) {
    float localBounds[4];
    nsvg__getLocalBounds(localBounds, shape); //, inv); //before any transform

    ox = localBounds[0];
    oy = localBounds[1];
    sw = localBounds[2] - localBounds[0];
    sh = localBounds[3] - localBounds[1];
  } else {
    ox = nsvg__actualOrigX(p);
    oy = nsvg__actualOrigY(p);
    sw = nsvg__actualWidth(p);
    sh = nsvg__actualHeight(p);
  }

  float gradForm[6]; //coordinates
  nsvg__xformIdentity(gradForm);
  //  sl = sqrtf(sw*sw + sh*sh) * 0.70710678118655f; // == 1. / sqrtf(2.0f);
  sl = nsvg__vmag(sw, sh) * 0.70710678118655f;
  if (data->type == NSVG_PAINT_LINEAR_GRADIENT) {
    float x1, y1, x2, y2, dx, dy;

    x1 = nsvg__convertToPixelsForGradient(p, data->units, &data->direction.linear.x1, ox, sw);