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Avoid calling Vector2d::normalize()/magnitude() several times

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This commit is contained in:
David Capello 2017-06-09 17:48:03 -03:00
parent 2a15c58b5b
commit 904d7dabe5
1 changed files with 5 additions and 2 deletions
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7
src/render/gradient.cpp
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@ -41,6 +41,8 @@ void render_rgba_linear_gradient(
u(p0.x, p0.y),
v(p1.x, p1.y), w;
w = v - u;
const double wmag = w.magnitude();
w = w.normalize();
// As we use non-premultiplied RGB values, we need correct RGB
// values on each stop. So in case that one color has alpha=0
@ -75,7 +77,7 @@ void render_rgba_linear_gradient(
for (int x=0; x<width; ++x, ++it) {
base::Vector2d<double> q(x, y);
q -= u;
double f = (q * w.normalize()) / (w.magnitude());
double f = (q * w) / wmag;
doc::color_t c;
if (f < 0.0) c = c0;
@ -96,7 +98,8 @@ void render_rgba_linear_gradient(
for (int x=0; x<width; ++x, ++it) {
base::Vector2d<double> q(x, y);
q -= u;
double f = (q * w.normalize()) / (w.magnitude());
double f = (q * w) / wmag;
*it = (f*matrix.maxValue() < matrix(y, x) ? c0: c1);
}
}