[gs-commits] ghostpdl branch, gs9.28-temp-for-testing, updated. gs9.28-temp-for-testing-tag-4-g802b23e

The ghostpdl branch, gs9.28-temp-for-testing has been updated
       via  802b23e38b229936d56c28a4c00cf55cf7a42d3a (commit)
      from  00372c15c7a16b82998a21cef2fa3ad78904f2d7 (commit)

----------------------------------------------------------------------
commit 802b23e38b229936d56c28a4c00cf55cf7a42d3a
Author: Robin Watts <[email protected]>
Date:   Mon Aug 26 14:01:39 2019 +0100

    Fix SoftLight blending in deep color transparency.
    
    As seen with:
    
     gs -sDEVICE=psdcmyk16 -r72 -dMaxBitmap=80000000 -o out.psd
      tests_private/pdf/PDF_1.7_FTS/fts_09_0919.pdf

diff --git a/base/gxblend.c b/base/gxblend.c
index 6756613..8f6645e 100644
--- a/base/gxblend.c
+++ b/base/gxblend.c
@@ -1360,9 +1360,12 @@ art_blend_pixel_16_inline(uint16_t *gs_restrict dst, const uint16_t *gs_restrict
             for (i = 0; i < n_chan; i++) {
                 b = backdrop[i];
                 s = src[i];
-                if (s <= 0x8000) {
-                    int b2 = b + (b>>15);
-                    dst[i] = b - (((0xffff - (s<<1)) * b2 * (0x10000 - b2))>>16);
+                if (s < 0x8000) {
+                    unsigned int b2 = ((unsigned int)(b * (b + (b>>15))))>>16;
+                    b2 = b - b2;
+                    b2 += b2>>15;
+                    t = ((0xffff - (s << 1)) * b2) + 0x8000;
+                    dst[i] = b - (t >> 16);
                 } else {
 #define art_blend_soft_light_16(B) (art_blend_soft_light_8[(B)>>8]*0x101)
                     t = ((s << 1) - 0xffff) * art_blend_soft_light_16(b) + 0x8000;


Summary of changes:
 base/gxblend.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)