diff options
Diffstat (limited to 'source/blender/imbuf/intern/divers.c')
| -rw-r--r-- | source/blender/imbuf/intern/divers.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/source/blender/imbuf/intern/divers.c b/source/blender/imbuf/intern/divers.c index 1e16f0975e2..aa49453d68c 100644 --- a/source/blender/imbuf/intern/divers.c +++ b/source/blender/imbuf/intern/divers.c @@ -96,6 +96,12 @@ MINLINE void float_to_byte_dither_v4( b[3] = unit_float_to_uchar_clamp(f[3]); } +/* Test if colorspace conversions of pixels in buffer need to take into account alpha. */ +bool IMB_alpha_affects_rgb(const ImBuf *ibuf) +{ + return (ibuf->flags & IB_alphamode_channel_packed) == 0; +} + /* float to byte pixels, output 4-channel RGBA */ void IMB_buffer_byte_from_float(uchar *rect_to, const float *rect_from, @@ -728,16 +734,19 @@ void IMB_rect_from_float(ImBuf *ibuf) buffer = MEM_dupallocN(ibuf->rect_float); /* first make float buffer in byte space */ + const bool predivide = IMB_alpha_affects_rgb(ibuf); IMB_colormanagement_transform(buffer, ibuf->x, ibuf->y, ibuf->channels, from_colorspace, ibuf->rect_colorspace->name, - true); + predivide); /* convert from float's premul alpha to byte's straight alpha */ - IMB_unpremultiply_rect_float(buffer, ibuf->channels, ibuf->x, ibuf->y); + if (IMB_alpha_affects_rgb(ibuf)) { + IMB_unpremultiply_rect_float(buffer, ibuf->channels, ibuf->x, ibuf->y); + } /* convert float to byte */ IMB_buffer_byte_from_float((unsigned char *)ibuf->rect, @@ -802,7 +811,9 @@ void IMB_float_from_rect(ImBuf *ibuf) rect_float, ibuf->x, ibuf->y, ibuf->channels, ibuf->rect_colorspace, false); /* byte buffer is straight alpha, float should always be premul */ - IMB_premultiply_rect_float(rect_float, ibuf->channels, ibuf->x, ibuf->y); + if (IMB_alpha_affects_rgb(ibuf)) { + IMB_premultiply_rect_float(rect_float, ibuf->channels, ibuf->x, ibuf->y); + } if (ibuf->rect_float == NULL) { ibuf->rect_float = rect_float; |