X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a4efa72179eeb3a99fa90c7d4bc6762eac0342fb..b9efe021b554fa3967d1442cf758435c5cd5ae8f:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 501f901e6b..007bfadaf0 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -717,6 +717,9 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
         iElements++;
     }
 
+    if ( iBitDepth == 16 )
+        iElements *= 2;
+
     png_set_sBIT( png_ptr, info_ptr, &sig_bit );
     png_write_info( png_ptr, info_ptr );
     png_set_shift( png_ptr, &sig_bit );
@@ -735,9 +738,15 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     int iHeight = image->GetHeight();
     int iWidth = image->GetWidth();
 
-    unsigned char uchMaskRed = bHasMask ? image->GetMaskRed() : 0;
-    unsigned char uchMaskGreen = bHasMask ? image->GetMaskGreen() : 0;
-    unsigned char uchMaskBlue = bHasMask ? image->GetMaskBlue() : 0;
+    unsigned char uchMaskRed = 0, uchMaskGreen = 0, uchMaskBlue = 0;
+
+    if ( bHasMask )
+    {
+        uchMaskRed = image->GetMaskRed();
+        uchMaskGreen = image->GetMaskGreen();
+        uchMaskBlue = image->GetMaskBlue();
+    }
+
     unsigned char *pColors = image->GetData();
 
     for (int y = 0; y != iHeight; ++y)
@@ -757,36 +766,34 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
 
                 case wxPNG_TYPE_COLOUR:
                     *pData++ = uchRed;
-                    if (iBitDepth > 8)
+                    if ( iBitDepth == 16 )
                         *pData++ = 0;
                     *pData++ = uchGreen;
-                    if (iBitDepth > 8)
+                    if ( iBitDepth == 16 )
                         *pData++ = 0;
                     *pData++ = uchBlue;
-                    if (iBitDepth > 8)
+                    if ( iBitDepth == 16 )
                         *pData++ = 0;
                     break;
 
                 case wxPNG_TYPE_GREY:
                     {
+                        // where do these coefficients come from? maybe we
+                        // should have image options for them as well?
                         unsigned uiColor =
                             (unsigned) (76.544*(unsigned)uchRed +
                                         150.272*(unsigned)uchGreen +
                                         36.864*(unsigned)uchBlue);
-                        uiColor >>= (16 - iBitDepth);
-                        if (iBitDepth > 8)
-                        {
-                            *pData++ = (unsigned char)((uiColor >> 8) & 0xFF);
-                            *pData++ = (unsigned char)(uiColor & 0xFF);
-                        } else {
+
+                        *pData++ = (unsigned char)((uiColor >> 8) & 0xFF);
+                        if ( iBitDepth == 16 )
                             *pData++ = (unsigned char)(uiColor & 0xFF);
-                        }
                     }
                     break;
 
                 case wxPNG_TYPE_GREY_RED:
                     *pData++ = uchRed;
-                    if (iBitDepth > 8)
+                    if ( iBitDepth == 16 )
                         *pData++ = 0;
                     break;
             }
@@ -806,7 +813,7 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                 }
 
                 *pData++ = uchAlpha;
-                if (iBitDepth > 8)
+                if ( iBitDepth == 16 )
                     *pData++ = 0;
             }
         }