thirdparty/scummvm
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GRAPHICS: Make VectorRendererAA::drawLineAlg never divide by zero.

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It won't crash any longer in the case dx = dy = 0.
This commit is contained in:
Johannes Schickel 2016-02-21 14:41:29 +01:00
parent 5bc3a5aa3f
commit 610d2eec00
1 changed files with 1 additions and 2 deletions
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3
graphics/VectorRendererSpec.cpp
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@ -1967,7 +1967,6 @@ drawRoundedSquareShadow(int x1, int y1, int r, int w, int h, int offset) {
template<typename PixelType>
void VectorRendererAA<PixelType>::
drawLineAlg(int x1, int y1, int x2, int y2, uint dx, uint dy, PixelType color) {
PixelType *ptr = (PixelType *)Base::_activeSurface->getBasePtr(x1, y1);
int pitch = Base::_activeSurface->pitch / Base::_activeSurface->format.bytesPerPixel;
int xdir = (x2 > x1) ? 1 : -1;
@ -1993,7 +1992,7 @@ drawLineAlg(int x1, int y1, int x2, int y2, uint dx, uint dy, PixelType color) {
this->blendPixelPtr(ptr, color, ~alpha);
this->blendPixelPtr(ptr + pitch, color, alpha);
}
} else {
} else if (dy != 0) {
gradient = (dx << 16) / dy;
error_acc = 0;