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xcf: Don't divide by 0

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oss-fuzz/12815
This commit is contained in:
Albert Astals Cid 2019-02-03 14:06:33 +01:00
parent a51cbd865f
commit bad90cea4b
1 changed files with 3 additions and 3 deletions
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6
src/imageformats/xcf.cpp
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@ -2214,7 +2214,7 @@ void XCFImageFormat::mergeRGBToRGB(Layer &layer, uint i, uint j, int k, int l,
uchar new_r, new_g, new_b, new_a;
new_a = dst_a + INT_MULT(OPAQUE_OPACITY - dst_a, src_a);
float src_ratio = (float)src_a / new_a;
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
new_r = (uchar)(src_ratio * src_r + dst_ratio * dst_r + EPSILON);
@ -2373,7 +2373,7 @@ void XCFImageFormat::mergeGrayAToGray(Layer &layer, uint i, uint j, int k, int l
uchar new_a = OPAQUE_OPACITY;
float src_ratio = (float)src_a / new_a;
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
uchar new_g = (uchar)(src_ratio * src + dst_ratio * dst + EPSILON);
@ -2546,7 +2546,7 @@ void XCFImageFormat::mergeGrayAToRGB(Layer &layer, uint i, uint j, int k, int l,
uchar new_a = dst_a + INT_MULT(OPAQUE_OPACITY - dst_a, src_a);
float src_ratio = (float)src_a / new_a;
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
uchar new_g = (uchar)(src_ratio * src + dst_ratio * dst + EPSILON);