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gdiplus: Implement GdipSetPathGradientSigmaBlend.

oldstable
Vincent Povirk 2012-04-24 09:55:29 -05:00 committed by Alexandre Julliard
parent d0a85604d5
commit 8273d58a96
1 changed files with 44 additions and 4 deletions
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48
dlls/gdiplus/brush.c
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@ -1642,17 +1642,57 @@ GpStatus WINGDIPAPI GdipSetPathGradientGammaCorrection(GpPathGradient *grad,
GpStatus WINGDIPAPI GdipSetPathGradientSigmaBlend(GpPathGradient *grad,
REAL focus, REAL scale)
{
static int calls;
REAL factors[33];
REAL positions[33];
int num_points = 0;
int i;
const int precision = 16;
REAL erf_range; /* we use values erf(-erf_range) through erf(+erf_range) */
REAL min_erf;
REAL scale_erf;
TRACE("(%p,%0.2f,%0.2f)\n", grad, focus, scale);
if(!grad || focus < 0.0 || focus > 1.0 || scale < 0.0 || scale > 1.0)
return InvalidParameter;
if(!(calls++))
FIXME("not implemented\n");
/* we want 2 standard deviations */
erf_range = 2.0 / sqrt(2);
return NotImplemented;
/* calculate the constants we need to normalize the error function to be
between 0.0 and scale over the range we need */
min_erf = erf(-erf_range);
scale_erf = scale / (-2.0 * min_erf);
if (focus != 0.0)
{
positions[0] = 0.0;
factors[0] = 0.0;
for (i=1; i<precision; i++)
{
positions[i] = focus * i / precision;
factors[i] = scale_erf * (erf(2 * erf_range * i / precision - erf_range) - min_erf);
}
num_points += precision;
}
positions[num_points] = focus;
factors[num_points] = scale;
num_points += 1;
if (focus != 1.0)
{
for (i=1; i<precision; i++)
{
positions[i+num_points-1] = (focus + ((1.0-focus) * i / precision));
factors[i+num_points-1] = scale_erf * (erf(erf_range - 2 * erf_range * i / precision) - min_erf);
}
num_points += precision;
positions[num_points-1] = 1.0;
factors[num_points-1] = 0.0;
}
return GdipSetPathGradientBlend(grad, factors, positions, num_points);
}
GpStatus WINGDIPAPI GdipSetPathGradientSurroundColorsWithCount(GpPathGradient