public void SetFilterOffset(double dx, double dy)
{
m_dx_dbl = dx;
m_dy_dbl = dy;
m_dx_int = AggBasics.iround(dx * img_subpix_const.SCALE);
m_dy_int = AggBasics.iround(dy * img_subpix_const.SCALE);
}
public ColorRGBA(ColorRGBAf c)
{
red = ((byte)AggBasics.uround(c.red * (double)BASE_MASK));
green = ((byte)AggBasics.uround(c.green * (double)BASE_MASK));
blue = ((byte)AggBasics.uround(c.blue * (double)BASE_MASK));
alpha = ((byte)AggBasics.uround(c.alpha * (double)BASE_MASK));
}
//--------------------------------------------------------------------
public void ResetGamma(IGammaFunction gamma_function)
{
for (int i = AA_SCALE - 1; i >= 0; --i)
{
m_gammaLut[i] = (int)AggBasics.uround(
gamma_function.GetGamma((float)(i) / AA_MASK) * AA_MASK);
}
}
public static ColorRGBA Make(float r_, float g_, float b_, float a_)
{
return(new ColorRGBA(
((byte)AggBasics.uround_f(r_ * (float)BASE_MASK)),
((byte)AggBasics.uround_f(g_ * (float)BASE_MASK)),
((byte)AggBasics.uround_f(b_ * (float)BASE_MASK)),
((byte)AggBasics.uround_f(a_ * (float)BASE_MASK))));
}
public static ColorRGBA Make(double r_, double g_, double b_)
{
return(new ColorRGBA(
((byte)AggBasics.uround(r_ * (double)BASE_MASK)),
((byte)AggBasics.uround(g_ * (double)BASE_MASK)),
((byte)AggBasics.uround(b_ * (double)BASE_MASK)),
((byte)AggBasics.uround(BASE_MASK))));
}
//--------------------------------------------------------------------
// This function normalizes integer values and corrects the rounding
// errors. It doesn't do anything with the source floating point values
// (m_weight_array_dbl), it corrects only integers according to the rule
// of 1.0 which means that any sum of pixel weights must be equal to 1.0.
// So, the filter function must produce a graph of the proper shape.
//--------------------------------------------------------------------
public void Normalize()
{
int i;
int flip = 1;
for (i = 0; i < (int)ImgSubPixConst.SCALE; i++)
{
for (; ;)
{
int sum = 0;
int j;
for (j = 0; j < m_diameter; j++)
{
sum += m_weight_array[j * (int)ImgSubPixConst.SCALE + i];
}
if (sum == (int)ImgFilterConst.SCALE)
{
break;
}
double k = (double)((int)ImgFilterConst.SCALE) / (double)(sum);
sum = 0;
for (j = 0; j < m_diameter; j++)
{
sum += m_weight_array[j * (int)ImgSubPixConst.SCALE + i] =
(int)AggBasics.iround(m_weight_array[j * (int)ImgSubPixConst.SCALE + i] * k);
}
sum -= (int)ImgFilterConst.SCALE;
int inc = (sum > 0) ? -1 : 1;
for (j = 0; j < m_diameter && sum != 0; j++)
{
flip ^= 1;
int idx = flip != 0 ? m_diameter / 2 + j / 2 : m_diameter / 2 - j / 2;
int v = m_weight_array[idx * (int)ImgSubPixConst.SCALE + i];
if (v < (int)ImgFilterConst.SCALE)
{
m_weight_array[idx * (int)ImgSubPixConst.SCALE + i] += (int)inc;
sum += inc;
}
}
}
}
int pivot = m_diameter << (ImgSubPixConst.SHIFT - 1);
for (i = 0; i < pivot; i++)
{
m_weight_array[pivot + i] = m_weight_array[pivot - i];
}
int end = (Diameter << ImgSubPixConst.SHIFT) - 1;
m_weight_array[0] = m_weight_array[end];
}
void SetGamma(float g)
{
m_gamma = g;
float inv_g = (float)(1.0 / g);
for (int i = GAMMA_SIZE - 1; i >= 0; --i)
{
m_dir_gamma[i] = (byte)AggBasics.uround(Math.Pow(i / (float)GAMMA_MASK, m_gamma) * (float)GAMMA_MASK);
m_inv_gamma[i] = (byte)AggBasics.uround(Math.Pow(i / (float)GAMMA_MASK, inv_g) * (float)GAMMA_MASK);
}
}
void ReallocLut(double radius)
{
m_radius = radius;
m_diameter = AggBasics.uceil(radius) * 2;
m_start = -(m_diameter / 2 - 1);
int size = m_diameter << ImgSubPixConst.SHIFT;
if (size > m_weight_array.Length)
{
m_weight_array = new int[size];
}
}
//--------------------------------------------------------------------
public SpanGenGradient(ISpanInterpolator inter,
IGradientValueCalculator gvc,
IGradientColorsProvider m_colorsProvider,
double d1, double d2)
{
this.m_interpolator = inter;
this.m_grValueCalculator = gvc;
this.m_colorsProvider = m_colorsProvider;
m_d1 = AggBasics.iround(d1 * GR_SUBPIX_SCALE);
m_d2 = AggBasics.iround(d2 * GR_SUBPIX_SCALE);
dd = m_d2 - m_d1;
if (dd < 1)
{
dd = 1;
}
stepRatio = (float)m_colorsProvider.GradientSteps / (float)dd;
}
public void Calculate(double y)
{
double k = (y - m_y1) * m_1dy;
if (k < 0.0)
{
k = 0.0;
}
if (k > 1.0)
{
k = 1.0;
}
m_r = m_r1 + AggBasics.iround(m_dr * k);
m_g = m_g1 + AggBasics.iround(m_dg * k);
m_b = m_b1 + AggBasics.iround(m_db * k);
m_a = m_a1 + AggBasics.iround(m_da * k);
m_x = AggBasics.iround((m_x1 + m_dx * k) * (double)SUBPIXEL_SCALE);
}
void Calculate(Image.IImageFilter filter, bool normalization)
{
double r = filter.GetRadius();
ReallocLut(r);
int i;
int pivot = Diameter << (ImgSubPixConst.SHIFT - 1);
for (i = 0; i < pivot; i++)
{
double x = (double)i / (double)ImgSubPixConst.SCALE;
double y = filter.CalculateWeight(x);
m_weight_array[pivot + i] =
m_weight_array[pivot - i] = AggBasics.iround(y * ImgFilterConst.SCALE);
}
int end = (Diameter << ImgSubPixConst.SHIFT) - 1;
m_weight_array[0] = m_weight_array[end];
if (normalization)
{
Normalize();
}
}
static int MulDiv(int a, int b, int c)
{
return(AggBasics.iround_f((float)a * (float)b / (float)c));
}
//---------------------------------
//from vector clipper
static int upscale(double v)
{
return AggBasics.iround(v * poly_subpix.SCALE);
}
