native scaling support for bitmap

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74287 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/osx/bitmap.h b/include/wx/osx/bitmap.h
index 736e325376e283f731ae859ac8d760107d61e79e..d9ec58f7bfe42115c4c620436b8eb0f78f145aba 100644 (file)
--- a/include/wx/osx/bitmap.h
+++ b/include/wx/osx/bitmap.h
@@ -135,6 +135,12 @@ public:
     bool Create( CGImageRef image );
     bool Create( WX_NSImage image );
     
+    // Create a bitmap compatible with the given DC, inheriting its magnification factor
+    bool Create(int width, int height, const wxDC& dc);
+
+    // Create a bitmap with a scale factor, width and height are multiplied with that factor
+    bool CreateScaled(int logwidth, int logheight, int depth, double logicalScale);
+    
     // virtual bool Create( WXHICON icon) ;
     virtual bool LoadFile(const wxString& name, wxBitmapType type = wxBITMAP_DEFAULT_TYPE);
     virtual bool SaveFile(const wxString& name, wxBitmapType type, const wxPalette *cmap = NULL) const;
@@ -197,6 +203,7 @@ public:
     void *BeginRawAccess() ;
     void EndRawAccess() ;
 
+    double GetScaleFactor() const;
 protected:
     virtual wxGDIRefData *CreateGDIRefData() const;
     virtual wxGDIRefData *CloneGDIRefData(const wxGDIRefData *data) const;

diff --git a/src/osx/core/bitmap.cpp b/src/osx/core/bitmap.cpp
index da236465dd4ffae271234a302fd915cf246febdf..f1f1821a3859233f11b83cdfe4b456e6c5c5fe13 100644 (file)
--- a/src/osx/core/bitmap.cpp
+++ b/src/osx/core/bitmap.cpp
@@ -56,6 +56,7 @@ class WXDLLEXPORT wxBitmapRefData: public wxGDIRefData
     friend class WXDLLIMPEXP_FWD_CORE wxIcon;
     friend class WXDLLIMPEXP_FWD_CORE wxCursor;
 public:
+    wxBitmapRefData(int width , int height , int depth, double logicalscale);
     wxBitmapRefData(int width , int height , int depth);
     wxBitmapRefData(CGImageRef image);
     wxBitmapRefData();
@@ -75,7 +76,7 @@ public:
     int GetWidth() const { return m_width; }
     int GetHeight() const { return m_height; }
     int GetDepth() const { return m_depth; }
-
+    double GetScaleFactor() const { return m_scaleFactor; }
     void *GetRawAccess() const;
     void *BeginRawAccess();
     void EndRawAccess();
@@ -109,6 +110,7 @@ public:
     int           GetBytesPerRow() const { return m_bytesPerRow; }
     private :
     bool Create(int width , int height , int depth);
+    bool Create(int width , int height , int depth, double logicalScale);
     bool Create( CGImageRef image );
     void Init();
 
@@ -127,6 +129,7 @@ public:
 #endif
 
     CGContextRef  m_hBitmap;
+    double        m_scaleFactor;
 };
 
 
@@ -242,12 +245,13 @@ void wxBitmapRefData::Init()
 
     m_rawAccessCount = 0 ;
     m_hasAlpha = false;
+    m_scaleFactor = 1.0;
 }
 
 wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData &tocopy) : wxGDIRefData()
 {
     Init();
-    Create(tocopy.m_width, tocopy.m_height, tocopy.m_depth);
+    Create(tocopy.m_width, tocopy.m_height, tocopy.m_depth, tocopy.m_scaleFactor);
 
     if (tocopy.m_bitmapMask)
         m_bitmapMask = new wxMask(*tocopy.m_bitmapMask);
@@ -271,6 +275,12 @@ wxBitmapRefData::wxBitmapRefData( int w , int h , int d )
     Create( w , h , d ) ;
 }
 
+wxBitmapRefData::wxBitmapRefData(int w , int h , int d, double logicalscale)
+{
+    Init() ;
+    Create( w , h , d, logicalscale ) ;
+}
+
 wxBitmapRefData::wxBitmapRefData(CGImageRef image)
 {
     Init();
@@ -336,13 +346,19 @@ bool wxBitmapRefData::Create( int w , int h , int d )
         m_hBitmap = CGBitmapContextCreate((char*) data, m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), kCGImageAlphaNoneSkipFirst );
         wxASSERT_MSG( m_hBitmap , wxT("Unable to create CGBitmapContext context") ) ;
         CGContextTranslateCTM( m_hBitmap, 0,  m_height );
-        CGContextScaleCTM( m_hBitmap, 1, -1 );
+        CGContextScaleCTM( m_hBitmap, 1*m_scaleFactor, -1*m_scaleFactor );
     } /* data != NULL */
     m_ok = ( m_hBitmap != NULL ) ;
 
     return m_ok ;
 }
 
+bool wxBitmapRefData::Create( int w , int h , int d, double logicalScale )
+{
+    m_scaleFactor = logicalScale;
+    return Create(w*logicalScale,h*logicalScale,d);
+}
+
 void wxBitmapRefData::UseAlpha( bool use )
 {
     if ( m_hasAlpha == use )
@@ -354,7 +370,7 @@ void wxBitmapRefData::UseAlpha( bool use )
     m_hBitmap = CGBitmapContextCreate((char*) m_memBuf.GetData(), m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), m_hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst );
     wxASSERT_MSG( m_hBitmap , wxT("Unable to create CGBitmapContext context") ) ;
     CGContextTranslateCTM( m_hBitmap, 0,  m_height );
-    CGContextScaleCTM( m_hBitmap, 1, -1 );
+    CGContextScaleCTM( m_hBitmap, 1*m_scaleFactor, -1*m_scaleFactor );
 }
 
 void *wxBitmapRefData::GetRawAccess() const
@@ -939,9 +955,9 @@ wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, i
     (void) Create(data, type, width, height, depth);
 }
 
-wxBitmap::wxBitmap(int width, int height, const wxDC& WXUNUSED(dc))
+wxBitmap::wxBitmap(int width, int height, const wxDC& dc)
 {
-    (void) Create(width, height);
+    (void)Create(width, height, dc);
 }
 
 wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
@@ -1046,11 +1062,13 @@ wxBitmap wxBitmap::GetSubBitmap(const wxRect &rect) const
                 (rect.y+rect.height <= GetHeight()),
                 wxNullBitmap, wxT("invalid bitmap or bitmap region") );
 
-    wxBitmap ret( rect.width, rect.height, GetDepth() );
+    wxBitmap ret;
+    double scale = GetScaleFactor();
+    ret.CreateScaled( rect.width, rect.height, GetDepth(), scale );
     wxASSERT_MSG( ret.IsOk(), wxT("GetSubBitmap error") );
 
-    int destwidth = rect.width ;
-    int destheight = rect.height ;
+    int destwidth = rect.width*scale ;
+    int destheight = rect.height*scale ;
 
     {
         unsigned char *sourcedata = (unsigned char*) GetRawAccess() ;
@@ -1061,7 +1079,7 @@ wxBitmap wxBitmap::GetSubBitmap(const wxRect &rect) const
         {
             int sourcelinesize = GetBitmapData()->GetBytesPerRow() ;
             int destlinesize = ret.GetBitmapData()->GetBytesPerRow() ;
-            unsigned char *source = sourcedata + rect.x * 4 + rect.y * sourcelinesize ;
+            unsigned char *source = sourcedata + int(rect.x * scale * 4 + rect.y *scale * sourcelinesize) ;
             unsigned char *dest = destdata ;
 
             for (int yy = 0; yy < destheight; ++yy, source += sourcelinesize , dest += destlinesize)
@@ -1118,6 +1136,24 @@ bool wxBitmap::Create(int w, int h, int d)
     return M_BITMAPDATA->IsOk() ;
 }
 
+bool wxBitmap::Create(int w, int h, const wxDC& dc)
+{
+    double factor = dc.GetContentScaleFactor();
+    return CreateScaled(w,h,wxBITMAP_SCREEN_DEPTH, factor);
+}
+
+bool wxBitmap::CreateScaled(int w, int h, int d, double logicalScale)
+{
+    UnRef();
+    
+    if ( d < 0 )
+        d = wxDisplayDepth() ;
+    
+    m_refData = new wxBitmapRefData( w , h , d, logicalScale );
+    
+    return M_BITMAPDATA->IsOk() ;
+}
+
 bool wxBitmap::Create(CGImageRef image)
 {
     UnRef();
@@ -1397,6 +1433,13 @@ int wxBitmap::GetWidth() const
    return M_BITMAPDATA->GetWidth() ;
 }
 
+double wxBitmap::GetScaleFactor() const
+{
+    wxCHECK_MSG( IsOk(), -1, wxT("invalid bitmap") );
+    
+    return M_BITMAPDATA->GetScaleFactor() ;
+}
+
 int wxBitmap::GetDepth() const
 {
    wxCHECK_MSG( IsOk(), -1, wxT("invalid bitmap") );