Mercurial > hg > octave-nkf
changeset 17139:dcac71776ae8
Invert alpha channel after reading from GraphicsMagick (bug #32896).
| author | Carnë Draug <carandraug@octave.org> |
|---|---|
| date | Thu, 01 Aug 2013 19:03:39 +0100 |
| parents | 96526baf7423 |
| children | b9ffacf34c2d |
| files | libinterp/dldfcn/__magick_read__.cc |
| diffstat | 1 files changed, 7 insertions(+), 7 deletions(-) [+] |
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--- a/libinterp/dldfcn/__magick_read__.cc +++ b/libinterp/dldfcn/__magick_read__.cc @@ -223,10 +223,10 @@ // using quantumOperator for the cases where we will be returning floating // point and want things in the range [0 1]. This is the same reason why // the divisor is of type double. - const double divisor = (imvec[0].depth () == 32) ? - std::numeric_limits<uint32_t>::max () : - ((uint64_t (1) << QuantumDepth) - 1) / - ((uint64_t (1) << imvec[0].depth ()) - 1); + const bool float_out = imvec[0].depth () == 32; + const double type_max = float_out ? 1 : ((uint64_t (1) << QuantumDepth) - 1); + const double divisor = float_out ? std::numeric_limits<uint32_t>::max () : + type_max / ((uint64_t (1) << imvec[0].depth ()) - 1); // FIXME: this workaround should probably be fixed in GM by creating a // new ImageType BilevelMatteType @@ -322,7 +322,7 @@ for (octave_idx_type row = 0; row < nRows; row++) { img_fvec[idx] = pix->red / divisor; - a_fvec[idx] = pix->opacity / divisor; + a_fvec[idx] = abs ((pix->opacity / divisor) - type_max); pix += row_shift; idx++; } @@ -397,7 +397,7 @@ rbuf[idx] = pix->red / divisor; gbuf[idx] = pix->green / divisor; bbuf[idx] = pix->blue / divisor; - a_fvec[a_idx] = pix->opacity / divisor; + a_fvec[idx] = abs ((pix->opacity / divisor) - type_max); pix += row_shift; idx++; a_idx++; @@ -480,7 +480,7 @@ mbuf[idx] = pix->green / divisor; ybuf[idx] = pix->blue / divisor; kbuf[idx] = pix->opacity / divisor; - a_fvec[a_idx] = *apix / divisor; + a_fvec[idx] = abs ((*apix / divisor) - type_max); pix += row_shift; idx++; a_idx++;