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Fix integer overflow for bigger textures

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This commit is contained in:
Mathias Gumz 2013-02-06 01:45:38 +01:00
parent 3e4ee48bf1
commit 779618e45d
1 changed files with 6 additions and 2 deletions
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8
src/FbTk/TextureRender.cc
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@ -111,6 +111,10 @@ struct Vec2 {
} }
}; };
template <typename T> int sign(T val) {
return (T(0) < val) - (val < T(0));
}
std::vector<char>& getGradientBuffer(size_t size) { std::vector<char>& getGradientBuffer(size_t size) {
static std::vector<char> buffer; static std::vector<char> buffer;
if (buffer.size() < size) if (buffer.size() < size)
@ -469,10 +473,10 @@ void renderRectangleGradient(bool interlaced,
// check, if the point (x, y) is left or right of the vectors // check, if the point (x, y) is left or right of the vectors
// 'a' and 'b'. if the point is on the same side for both 'a' and // 'a' and 'b'. if the point is on the same side for both 'a' and
// 'b' (a.cross() is equal to b.cross()) then use the y_gradient, // 'b' (a.cross() is equal to b.cross()) then use the x_gradient,
// otherwise use y_gradient // otherwise use y_gradient
if ((a.cross(x, y) * b.cross(x, b.y + y)) < 0) { if (sign(a.cross(x, y)) * sign(b.cross(x, b.y + y)) < 0) {
rgba[i] = x_gradient[x]; rgba[i] = x_gradient[x];
} else { } else {
rgba[i] = y_gradient[y]; rgba[i] = y_gradient[y];