X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/69060f4f0c6a35cd4e8c031794f7c78c59712539..eea4d01c65f9b29baa1193db762b4c6b8144af24:/src/msw/dib.cpp

diff --git a/src/msw/dib.cpp b/src/msw/dib.cpp
index 45986e70ad..4eff321612 100644
--- a/src/msw/dib.cpp
+++ b/src/msw/dib.cpp
@@ -658,9 +658,9 @@ wxPalette *wxDIB::CreatePalette() const
 
 #if wxUSE_IMAGE
 
-bool wxDIB::Create(const wxImage& image)
+bool wxDIB::Create(const wxImage& image, PixelFormat pf)
 {
-    wxCHECK_MSG( image.Ok(), false, wxT("invalid wxImage in wxDIB ctor") );
+    wxCHECK_MSG( image.IsOk(), false, wxT("invalid wxImage in wxDIB ctor") );
 
     const int h = image.GetHeight();
     const int w = image.GetWidth();
@@ -683,27 +683,48 @@ bool wxDIB::Create(const wxImage& image)
     unsigned char *dstLineStart = (unsigned char *)m_data;
     for ( int y = 0; y < h; y++ )
     {
-        // copy one DIB line
+        // Copy one DIB line. Note that RGB components order is reversed in
+        // Windows bitmaps compared to wxImage and is actually BGR.
         unsigned char *dst = dstLineStart;
         if ( alpha )
         {
-            for ( int x = 0; x < w; x++ )
+            int x;
+
+            switch ( pf )
             {
-                // RGB order is reversed, and we need to premultiply
-                // all channels by alpha value for use with ::AlphaBlend.
-                const unsigned char a = *alpha++;
-                *dst++ = (unsigned char)((src[2] * a + 127) / 255);
-                *dst++ = (unsigned char)((src[1] * a + 127) / 255);
-                *dst++ = (unsigned char)((src[0] * a + 127) / 255);
-                *dst++ = a;
-                src += 3;
+                case PixelFormat_PreMultiplied:
+                    // Pre-multiply pixel values so that the DIB could be used
+                    // with ::AlphaBlend().
+                    for ( x = 0; x < w; x++ )
+                    {
+                        const unsigned char a = *alpha++;
+                        *dst++ = (unsigned char)((src[2] * a + 127) / 255);
+                        *dst++ = (unsigned char)((src[1] * a + 127) / 255);
+                        *dst++ = (unsigned char)((src[0] * a + 127) / 255);
+                        *dst++ = a;
+                        src += 3;
+                    }
+                    break;
+
+                case PixelFormat_NotPreMultiplied:
+                    // Just copy pixel data without changing it.
+                    for ( x = 0; x < w; x++ )
+                    {
+                        *dst++ = src[2];
+                        *dst++ = src[1];
+                        *dst++ = src[0];
+
+                        *dst++ = *alpha++;
+                        src += 3;
+                    }
+                    break;
             }
+
         }
         else // no alpha channel
         {
             for ( int x = 0; x < w; x++ )
             {
-                // RGB order is reversed.
                 *dst++ = src[2];
                 *dst++ = src[1];
                 *dst++ = src[0];
@@ -732,14 +753,21 @@ wxImage wxDIB::ConvertToImage() const
     const int w = GetWidth();
     const int h = GetHeight();
     wxImage image(w, h, false /* don't bother clearing memory */);
-    if ( !image.Ok() )
+    if ( !image.IsOk() )
     {
         wxFAIL_MSG( wxT("could not allocate data for image") );
         return wxNullImage;
     }
 
     const int bpp = GetDepth();
+
+    // Remember if we have any "real" transparency, i.e. either any partially
+    // transparent pixels or not all pixels are fully opaque or fully
+    // transparent.
     bool hasAlpha = false;
+    bool hasOpaque = false;
+    bool hasTransparent = false;
+
     if ( bpp == 32 )
     {
         // 32 bit bitmaps may be either 0RGB or ARGB and we don't know in
@@ -772,13 +800,30 @@ wxImage wxDIB::ConvertToImage() const
                 // premultiplication done in Create() above
                 const unsigned char a = *src;
                 *alpha++ = a;
+
+                // Check what kind of alpha do we have.
+                switch ( a )
+                {
+                    case 0:
+                        hasTransparent = true;
+                        break;
+
+                    default:
+                        // Anything in between means we have real transparency
+                        // and must use alpha channel.
+                        hasAlpha = true;
+                        break;
+
+                    case 255:
+                        hasOpaque = true;
+                        break;
+                }
+
                 if ( a > 0 )
                 {
                     dst[0] = (dst[0] * 255) / a;
                     dst[1] = (dst[1] * 255) / a;
                     dst[2] = (dst[2] * 255) / a;
-
-                    hasAlpha = true;
                 }
 
                 src++;
@@ -796,6 +841,9 @@ wxImage wxDIB::ConvertToImage() const
         srcLineStart += srcBytesPerLine;
     }
 
+    if ( hasOpaque && hasTransparent )
+        hasAlpha = true;
+
     if ( !hasAlpha && image.HasAlpha() )
         image.ClearAlpha();