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author | Tor Andersson <tor@ghostscript.com> | 2010-08-07 13:17:31 +0000 |
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committer | Tor Andersson <tor@ghostscript.com> | 2010-08-07 13:17:31 +0000 |
commit | 1f2595c8c65b543f0c7a071fa30ec72ad7a67d2f (patch) | |
tree | 79b6f803904fac74a45e28992baceae823c09dcb | |
parent | 17dbea62bfa74f0c64cda9a887bc1625988571f4 (diff) | |
download | mupdf-1f2595c8c65b543f0c7a071fa30ec72ad7a67d2f.tar.xz |
Fix bug where image with alpha painting was not multiplying colors with the constant alpha.
-rw-r--r-- | draw/imagedraw.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/draw/imagedraw.c b/draw/imagedraw.c index b9bb2702..d1977cea 100644 --- a/draw/imagedraw.c +++ b/draw/imagedraw.c @@ -57,13 +57,13 @@ fz_paintaffinealphaN(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, i for (k = 0; k < n; k++) { x = bilerp(a[k], b[k], c[k], d[k], uf, vf); - dp[k] = x + fz_mul255(dp[k], t); + dp[k] = fz_mul255(x, alpha) + fz_mul255(dp[k], t); } #else byte *sample = sp + ((vi * sw + ui) * n); int t = 255 - fz_mul255(sample[n-1], alpha); for (k = 0; k < n; k++) - dp[k] = sample[k] + fz_mul255(dp[k], t); + dp[k] = fz_mul255(sample[k], alpha) + fz_mul255(dp[k], t); #endif } dp += n; @@ -160,7 +160,7 @@ fz_paintaffine(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, default: fz_paintaffineN(dp, sp, sw, sh, u, v, fa, fb, w, n); break; } } - else if (alpha > 0) + else if (alpha > 0) { switch (n) { |