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| author | Glenn Kennard <glenn.kennard@gmail.com> | 2008-03-21 01:49:00 +0100 |
|---|---|---|
| committer | Glenn Kennard <glenn.kennard@gmail.com> | 2008-03-21 01:49:00 +0100 |
| commit | 783f538d4ee8e87bfd911345c903052b29b92338 (patch) | |
| tree | 3bb43754e7051d9529311facbb15b559b1d6c76e /raster/imagedraw.c | |
| parent | 81cf682d56185937d83dba5d787b0c72d10f0446 (diff) | |
| download | mupdf-783f538d4ee8e87bfd911345c903052b29b92338.tar.xz | |
Propagate alpha into rendering routines
I think these need premul, but not certain yet.
Diffstat (limited to 'raster/imagedraw.c')
| -rw-r--r-- | raster/imagedraw.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/raster/imagedraw.c b/raster/imagedraw.c index 0f51c01b..d7eb5dc7 100644 --- a/raster/imagedraw.c +++ b/raster/imagedraw.c @@ -201,11 +201,12 @@ static void img_4o4(FZ_PSRC, FZ_PDST, FZ_PCTM) } } -static void img_w3i1o4(byte *rgb, FZ_PSRC, FZ_PDST, FZ_PCTM) +static void img_w3i1o4(byte *argb, FZ_PSRC, FZ_PDST, FZ_PCTM) { - byte rgb0 = rgb[0]; - byte rgb1 = rgb[1]; - byte rgb2 = rgb[2]; + byte ca = argb[0]; + byte rgb0 = argb[1]; + byte rgb1 = argb[2]; + byte rgb2 = argb[3]; byte sa, ssa; while (h--) { @@ -216,6 +217,7 @@ static void img_w3i1o4(byte *rgb, FZ_PSRC, FZ_PDST, FZ_PCTM) while (w--) { sa = samplemask(src, srcw, srch, u, v); + sa = fz_mul255(sa, ca); ssa = 255 - sa; dstp[0] = sa + fz_mul255(dstp[0], ssa); dstp[1] = rgb0 + fz_mul255((short)dstp[1] - rgb0, ssa); |