X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/dd61e8ed01072bc75060245923419eda94ca5d32..1c1ad00573fc825322af8e5174c52a10a17385c9:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index da38225970..bb081b809a 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -279,6 +279,7 @@ FindMaskColour(unsigned char **lines, png_uint_32 width, png_uint_32 height,
             r2 = *p++;
             g2 = *p++;
             b2 = *p++;
+            ++p; // jump over alpha
 
             wxImageHistogramEntry&
                 entry = h[wxImageHistogram:: MakeKey(r2, g2, b2)];
@@ -384,8 +385,8 @@ void CopyDataFromPNG(wxImage *image,
                         if ( IsTransparent(a) )
                         {
                             *ptrDst++ = rMask;
-                            *ptrDst++ = bMask;
                             *ptrDst++ = gMask;
+                            *ptrDst++ = bMask;
                             break;
                         }
                         // else: !transparent
@@ -452,8 +453,8 @@ void CopyDataFromPNG(wxImage *image,
                         if ( IsTransparent(a) )
                         {
                             *ptrDst++ = rMask;
-                            *ptrDst++ = bMask;
                             *ptrDst++ = gMask;
+                            *ptrDst++ = bMask;
                             break;
                         }
                         else // !transparent
@@ -747,6 +748,33 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     if ( iBitDepth == 16 )
         iElements *= 2;
 
+    // save the image resolution if we have it
+    int resX, resY;
+    switch ( GetResolutionFromOptions(*image, &resX, &resY) )
+    {
+        case wxIMAGE_RESOLUTION_INCHES:
+            {
+                const double INCHES_IN_METER = 10000.0 / 254;
+                resX = int(resX * INCHES_IN_METER);
+                resY = int(resY * INCHES_IN_METER);
+            }
+            break;
+
+        case wxIMAGE_RESOLUTION_CM:
+            resX *= 100;
+            resY *= 100;
+            break;
+
+        case wxIMAGE_RESOLUTION_NONE:
+            break;
+
+        default:
+            wxFAIL_MSG( _T("unsupported image resolution units") );
+    }
+
+    if ( resX && resY )
+        png_set_pHYs( png_ptr, info_ptr, resX, resY, PNG_RESOLUTION_METER );
+
     png_set_sBIT( png_ptr, info_ptr, &sig_bit );
     png_write_info( png_ptr, info_ptr );
     png_set_shift( png_ptr, &sig_bit );