Use the current font for the DoGetBestSize calculation

[wxWidgets.git] / src / msw / dib.cpp

diff --git a/src/msw/dib.cpp b/src/msw/dib.cpp
index 92db7b427d40dd307bec4330d81feea3b58ac336..a76592f9b06a65be056fe0f6292bbb6cc2a2fb28 100644 (file)
--- a/src/msw/dib.cpp
+++ b/src/msw/dib.cpp
@@ -12,8 +12,7 @@
 /*
     TODO: support for palettes is very incomplete, several functions simply
           ignore them (we should select and realize the palette, if any, before
 /*
     TODO: support for palettes is very incomplete, several functions simply
           ignore them (we should select and realize the palette, if any, before

-          caling GetDIBits() in the DC we use with it and we shouldn't use
-          GetBitmapBits() at all because we can't do it with it)
+          caling GetDIBits() in the DC we use with it.

  */
 
 // ============================================================================
  */
 
 // ============================================================================


@@ -36,6 +35,8 @@
     #include "wx/log.h"
 #endif //WX_PRECOMP
 
     #include "wx/log.h"
 #endif //WX_PRECOMP
 

+#if wxUSE_WXDIB
+

 #include "wx/bitmap.h"
 #include "wx/intl.h"
 #include "wx/file.h"
 #include "wx/bitmap.h"
 #include "wx/intl.h"
 #include "wx/file.h"


@@ -44,7 +45,7 @@
 #include <stdlib.h>
 
 #if !defined(__MWERKS__) && !defined(__SALFORDC__)
 #include <stdlib.h>
 
 #if !defined(__MWERKS__) && !defined(__SALFORDC__)

-#include <memory.h>
+    #include <memory.h>

 #endif
 
 #ifdef __GNUWIN32_OLD__
 #endif
 
 #ifdef __GNUWIN32_OLD__


@@ -54,17 +55,32 @@
 #include "wx/image.h"
 #include "wx/msw/dib.h"
 
 #include "wx/image.h"
 #include "wx/msw/dib.h"
 

+#ifdef __WXWINCE__
+    #include <shellapi.h>       // for SHLoadDIBitmap()
+#endif
+

 // ----------------------------------------------------------------------------
 // private functions
 // ----------------------------------------------------------------------------
 
 // calculate the number of palette entries needed for the bitmap with this
 // number of bits per pixel
 // ----------------------------------------------------------------------------
 // private functions
 // ----------------------------------------------------------------------------
 
 // calculate the number of palette entries needed for the bitmap with this
 // number of bits per pixel

-static WORD wxGetNumOfBitmapColors(WORD bitsPerPixel)
+static inline WORD GetNumberOfColours(WORD bitsPerPixel)

 {
     // only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
     // 24bpp ones too but we don't support this as I think it's quite uncommon)
 {
     // only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
     // 24bpp ones too but we don't support this as I think it's quite uncommon)

-    return bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0;
+    return (WORD)(bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0);
+}
+
+// wrapper around ::GetObject() for DIB sections
+static inline bool GetDIBSection(HBITMAP hbmp, DIBSECTION *ds)
+{
+    // note that at least under Win9x (this doesn't seem to happen under Win2K
+    // but this doesn't mean anything, of course), GetObject() may return
+    // sizeof(DIBSECTION) for a bitmap which is *not* a DIB section and the way
+    // to check for it is by looking at the bits pointer
+    return ::GetObject(hbmp, sizeof(DIBSECTION), ds) == sizeof(DIBSECTION) &&
+                ds->dsBm.bmBits;

 }
 
 // ============================================================================
 }
 
 // ============================================================================


@@ -77,18 +93,21 @@ static WORD wxGetNumOfBitmapColors(WORD bitsPerPixel)
 
 bool wxDIB::Create(int width, int height, int depth)
 {
 
 bool wxDIB::Create(int width, int height, int depth)
 {

-    // we don't handle the palette yet
-    wxASSERT_MSG( depth == 24 || depth == 32,
-                    _T("unsupported image depth in wxDIB::Create()") );
+    // we don't support formats using palettes right now so we only create
+    // either 24bpp (RGB) or 32bpp (RGBA) bitmaps
+    wxASSERT_MSG( depth, _T("invalid image depth in wxDIB::Create()") );
+    if ( depth < 24 )
+        depth = 24;

 
 

-    static const int infosize = sizeof(BITMAPINFOHEADER);
+    // allocate memory for bitmap structures
+    static const int sizeHeader = sizeof(BITMAPINFOHEADER);

 
 

-    BITMAPINFO *info = (BITMAPINFO *)malloc(infosize);
-    wxCHECK_MSG( info, NULL, _T("malloc(BITMAPINFO) failed") );
+    BITMAPINFO *info = (BITMAPINFO *)malloc(sizeHeader);
+    wxCHECK_MSG( info, false, _T("malloc(BITMAPINFO) failed") );

 
 

-    memset(info, 0, infosize);
+    memset(info, 0, sizeHeader);

 
 

-    info->bmiHeader.biSize = infosize;
+    info->bmiHeader.biSize = sizeHeader;

     info->bmiHeader.biWidth = width;
 
     // we use positive height here which corresponds to a DIB with normal, i.e.
     info->bmiHeader.biWidth = width;
 
     // we use positive height here which corresponds to a DIB with normal, i.e.


@@ -99,7 +118,7 @@ bool wxDIB::Create(int width, int height, int depth)
     info->bmiHeader.biHeight = height;
 
     info->bmiHeader.biPlanes = 1;
     info->bmiHeader.biHeight = height;
 
     info->bmiHeader.biPlanes = 1;

-    info->bmiHeader.biBitCount = depth;
+    info->bmiHeader.biBitCount = (WORD)depth;

     info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
 
     m_handle = ::CreateDIBSection
     info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
 
     m_handle = ::CreateDIBSection


@@ -132,37 +151,142 @@ bool wxDIB::Create(const wxBitmap& bmp)
 {
     wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
 
 {
     wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
 

-    const int w = bmp.GetWidth();
-    const int h = bmp.GetHeight();
-    int d = bmp.GetDepth();
-    if ( d == -1 )
-        d = wxDisplayDepth();
+    if ( !Create(GetHbitmapOf(bmp)) )
+        return false;
+
+    m_hasAlpha = bmp.HasAlpha();
+
+    return true;
+}
+
+bool wxDIB::Create(HBITMAP hbmp)
+{
+    // this bitmap could already be a DIB section in which case we don't need
+    // to convert it to DIB
+    DIBSECTION ds;
+    if ( GetDIBSection(hbmp, &ds) )
+    {
+        m_handle = hbmp;
+
+        // wxBitmap will free it, not we
+        m_ownsHandle = false;
+
+        // copy all the bitmap parameters too as we have them now anyhow
+        m_width = ds.dsBm.bmWidth;
+        m_height = ds.dsBm.bmHeight;
+        m_depth = ds.dsBm.bmBitsPixel;
+
+        m_data = ds.dsBm.bmBits;
+    }
+    else // no, it's a DDB -- convert it to DIB
+    {
+        // prepare all the info we need
+        BITMAP bm;
+        if ( !::GetObject(hbmp, sizeof(bm), &bm) )
+        {
+            wxLogLastError(wxT("GetObject(bitmap)"));
+
+            return false;
+        }
+
+        int d = bm.bmBitsPixel;
+        if ( d <= 0 )
+            d = wxDisplayDepth();

 
 

-    if ( !Create(w, h, d) )
+        if ( !Create(bm.bmWidth, bm.bmHeight, d) || !CopyFromDDB(hbmp) )
+            return false;
+    }
+
+    return true;
+}
+
+// Windows CE doesn't have GetDIBits() so use an alternative implementation
+// for it
+//
+// in fact I'm not sure if GetDIBits() is really much better than using
+// BitBlt() like this -- it should be faster but I didn't do any tests, if
+// anybody has time to do them and by chance finds that GetDIBits() is not
+// much faster than BitBlt(), we could always use the Win CE version here
+#ifdef __WXWINCE__
+
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+    MemoryHDC hdcSrc;
+    if ( !hdcSrc )
+        return false;
+
+    SelectInHDC selectSrc(hdcSrc, hbmp);
+    if ( !selectSrc )

         return false;
 
         return false;
 

-    // we could have used GetDIBits() too but GetBitmapBits() is simpler
-    if ( !::GetBitmapBits
+    MemoryHDC hdcDst;
+    if ( !hdcDst )
+        return false;
+
+    SelectInHDC selectDst(hdcDst, m_handle);
+    if ( !selectDst )
+        return false;
+
+
+    if ( !::BitBlt(
+                    hdcDst,
+                    0, 0, m_width, m_height,
+                    hdcSrc,
+                    0, 0,
+                    SRCCOPY
+                  ) )
+    {
+        wxLogLastError(_T("BitBlt(DDB -> DIB)"));
+
+        return false;
+    }
+
+    return true;
+}
+
+#else // !__WXWINCE__
+
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+    DIBSECTION ds;
+    if ( !GetDIBSection(m_handle, &ds) )
+    {
+        // we're sure that our handle is a DIB section, so this should work
+        wxFAIL_MSG( _T("GetObject(DIBSECTION) unexpectedly failed") );
+
+        return false;
+    }
+
+    if ( !::GetDIBits

             (
             (

-                GetHbitmapOf(bmp),      // the source DDB
-                GetLineSize(w, d)*h,    // the number of bytes to copy
-                m_data                  // the pixels will be copied here
+                ScreenHDC(),                // the DC to use
+                hbmp,                       // the source DDB
+                0,                          // first scan line
+                m_height,                   // number of lines to copy
+                ds.dsBm.bmBits,             // pointer to the buffer
+                (BITMAPINFO *)&ds.dsBmih,   // bitmap header
+                DIB_RGB_COLORS              // and not DIB_PAL_COLORS

             ) )
     {
         wxLogLastError(wxT("GetDIBits()"));
 
             ) )
     {
         wxLogLastError(wxT("GetDIBits()"));
 

-        return 0;
+        return false;

     }
 
     return true;
 }
 
     }
 
     return true;
 }
 

+#endif // __WXWINCE__/!__WXWINCE__
+

 // ----------------------------------------------------------------------------
 // Loading/saving the DIBs
 // ----------------------------------------------------------------------------
 
 bool wxDIB::Load(const wxString& filename)
 {
 // ----------------------------------------------------------------------------
 // Loading/saving the DIBs
 // ----------------------------------------------------------------------------
 
 bool wxDIB::Load(const wxString& filename)
 {

+#ifdef __WXWINCE__
+    m_handle = SHLoadDIBitmap(filename);
+#else // !__WXWINCE__

     m_handle = (HBITMAP)::LoadImage
                          (
                             wxGetInstance(),
     m_handle = (HBITMAP)::LoadImage
                          (
                             wxGetInstance(),


@@ -171,9 +295,11 @@ bool wxDIB::Load(const wxString& filename)
                             0, 0, // don't specify the size
                             LR_CREATEDIBSECTION | LR_LOADFROMFILE
                          );
                             0, 0, // don't specify the size
                             LR_CREATEDIBSECTION | LR_LOADFROMFILE
                          );

+#endif // __WXWINCE__
+

     if ( !m_handle )
     {
     if ( !m_handle )
     {

-        wxLogLastError(_T("LoadImage(LR_CREATEDIBSECTION | LR_LOADFROMFILE)"));
+        wxLogLastError(_T("Loading DIB from file"));

 
         return false;
     }
 
         return false;
     }


@@ -190,7 +316,7 @@ bool wxDIB::Save(const wxString& filename)
     if ( ok )
     {
         DIBSECTION ds;
     if ( ok )
     {
         DIBSECTION ds;

-        if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+        if ( !GetDIBSection(m_handle, &ds) )

         {
             wxLogLastError(_T("GetObject(hDIB)"));
         }
         {
             wxLogLastError(_T("GetObject(hDIB)"));
         }


@@ -239,7 +365,7 @@ void wxDIB::DoGetObject() const
         // check for this now rather than trying to find out why it doesn't
         // work later
         DIBSECTION ds;
         // check for this now rather than trying to find out why it doesn't
         // work later
         DIBSECTION ds;

-        if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+        if ( !GetDIBSection(m_handle, &ds) )

         {
             wxLogLastError(_T("GetObject(hDIB)"));
             return;
         {
             wxLogLastError(_T("GetObject(hDIB)"));
             return;


@@ -258,12 +384,14 @@ void wxDIB::DoGetObject() const
 // DDB <-> DIB conversions
 // ----------------------------------------------------------------------------
 
 // DDB <-> DIB conversions
 // ----------------------------------------------------------------------------
 

+#ifndef __WXWINCE__
+

 HBITMAP wxDIB::CreateDDB(HDC hdc) const
 {
     wxCHECK_MSG( m_handle, 0, _T("wxDIB::CreateDDB(): invalid object") );
 
     DIBSECTION ds;
 HBITMAP wxDIB::CreateDDB(HDC hdc) const
 {
     wxCHECK_MSG( m_handle, 0, _T("wxDIB::CreateDDB(): invalid object") );
 
     DIBSECTION ds;

-    if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+    if ( !GetDIBSection(m_handle, &ds) )

     {
         wxLogLastError(_T("GetObject(hDIB)"));
 
     {
         wxLogLastError(_T("GetObject(hDIB)"));
 


@@ -288,13 +416,31 @@ HBITMAP wxDIB::ConvertToBitmap(const BITMAPINFO *pbmi, HDC hdc, void *bits)
     if ( !bits )
     {
         // we must skip over the colour table to get to the image data
     if ( !bits )
     {
         // we must skip over the colour table to get to the image data

-
-        // biClrUsed has the number of colors but it may be not initialized at
-        // all
-        int numColors = pbmih->biClrUsed;
-        if ( !numColors )
+        //
+        // colour table either has the real colour data in which case its
+        // number of entries is given by biClrUsed or is used for masks to be
+        // used for extracting colour information from true colour bitmaps in
+        // which case it always have exactly 3 DWORDs
+        int numColors;
+        switch ( pbmih->biCompression )

         {
         {

-            numColors = wxGetNumOfBitmapColors(pbmih->biBitCount);
+            case BI_BITFIELDS:
+                numColors = 3;
+                break;
+
+            case BI_RGB:
+                // biClrUsed has the number of colors but it may be not initialized at
+                // all
+                numColors = pbmih->biClrUsed;
+                if ( !numColors )
+                {
+                    numColors = GetNumberOfColours(pbmih->biBitCount);
+                }
+                break;
+
+            default:
+                // no idea how it should be calculated for the other cases
+                numColors = 0;

         }
 
         bits = (char *)pbmih + sizeof(*pbmih) + numColors*sizeof(RGBQUAD);
         }
 
         bits = (char *)pbmih + sizeof(*pbmih) + numColors*sizeof(RGBQUAD);


@@ -354,7 +500,7 @@ size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
     bi.biBitCount = bm.bmBitsPixel;
 
     // memory we need for BITMAPINFO only
     bi.biBitCount = bm.bmBitsPixel;
 
     // memory we need for BITMAPINFO only

-    DWORD dwLen = bi.biSize + wxGetNumOfBitmapColors(bm.bmBitsPixel) * sizeof(RGBQUAD);
+    DWORD dwLen = bi.biSize + GetNumberOfColours(bm.bmBitsPixel) * sizeof(RGBQUAD);

 
     // get either just the image size or the image bits
     if ( !::GetDIBits
 
     // get either just the image size or the image bits
     if ( !::GetDIBits


@@ -400,7 +546,7 @@ HGLOBAL wxDIB::ConvertFromBitmap(HBITMAP hbmp)
         return NULL;
     }
 
         return NULL;
     }
 

-    if ( !ConvertFromBitmap((BITMAPINFO *)GlobalHandle(hDIB), hbmp) )
+    if ( !ConvertFromBitmap((BITMAPINFO *)(void *)GlobalPtr(hDIB), hbmp) )

     {
         // this really shouldn't happen... it worked the first time, why not
         // now?
     {
         // this really shouldn't happen... it worked the first time, why not
         // now?


@@ -412,6 +558,8 @@ HGLOBAL wxDIB::ConvertFromBitmap(HBITMAP hbmp)
     return hDIB;
 }
 
     return hDIB;
 }
 

+#endif // __WXWINCE__
+

 // ----------------------------------------------------------------------------
 // palette support
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // palette support
 // ----------------------------------------------------------------------------


@@ -423,7 +571,7 @@ wxPalette *wxDIB::CreatePalette() const
     wxCHECK_MSG( m_handle, NULL, _T("wxDIB::CreatePalette(): invalid object") );
 
     DIBSECTION ds;
     wxCHECK_MSG( m_handle, NULL, _T("wxDIB::CreatePalette(): invalid object") );
 
     DIBSECTION ds;

-    if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+    if ( !GetDIBSection(m_handle, &ds) )

     {
         wxLogLastError(_T("GetObject(hDIB)"));
 
     {
         wxLogLastError(_T("GetObject(hDIB)"));
 


@@ -435,7 +583,7 @@ wxPalette *wxDIB::CreatePalette() const
     if ( !biClrUsed )
     {
         // biClrUsed field might not be set
     if ( !biClrUsed )
     {
         // biClrUsed field might not be set

-        biClrUsed = wxGetNumOfBitmapColors(ds.dsBmih.biBitCount);
+        biClrUsed = GetNumberOfColours(ds.dsBmih.biBitCount);

     }
 
     if ( !biClrUsed )
     }
 
     if ( !biClrUsed )


@@ -455,7 +603,7 @@ wxPalette *wxDIB::CreatePalette() const
 
     // initialize the palette header
     pPalette->palVersion = 0x300;  // magic number, not in docs but works
 
     // initialize the palette header
     pPalette->palVersion = 0x300;  // magic number, not in docs but works

-    pPalette->palNumEntries = biClrUsed;
+    pPalette->palNumEntries = (WORD)biClrUsed;

 
     // and the colour table (it starts right after the end of the header)
     const RGBQUAD *pRGB = (RGBQUAD *)((char *)&ds.dsBmih + ds.dsBmih.biSize);
 
     // and the colour table (it starts right after the end of the header)
     const RGBQUAD *pRGB = (RGBQUAD *)((char *)&ds.dsBmih + ds.dsBmih.biSize);


@@ -501,8 +649,8 @@ bool wxDIB::Create(const wxImage& image)
 
     // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
     // a 24bpp RGB is sufficient
 
     // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
     // a 24bpp RGB is sufficient

-    const bool hasAlpha = image.HasAlpha();
-    const int bpp = hasAlpha ? 32 : 24;
+    m_hasAlpha = image.HasAlpha();
+    const int bpp = m_hasAlpha ? 32 : 24;

 
     if ( !Create(w, h, bpp) )
         return false;
 
     if ( !Create(w, h, bpp) )
         return false;


@@ -512,23 +660,37 @@ bool wxDIB::Create(const wxImage& image)
     const int srcBytesPerLine = w * 3;
     const int dstBytesPerLine = GetLineSize(w, bpp);
     const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);
     const int srcBytesPerLine = w * 3;
     const int dstBytesPerLine = GetLineSize(w, bpp);
     const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);

-    const unsigned char *alpha = hasAlpha ? image.GetAlpha() + (h - 1)*w : NULL;
+    const unsigned char *alpha = m_hasAlpha ? image.GetAlpha() + (h - 1)*w
+                                            : NULL;

     unsigned char *dstLineStart = (unsigned char *)m_data;
     for ( int y = 0; y < h; y++ )
     {
         // copy one DIB line
         unsigned char *dst = dstLineStart;
     unsigned char *dstLineStart = (unsigned char *)m_data;
     for ( int y = 0; y < h; y++ )
     {
         // copy one DIB line
         unsigned char *dst = dstLineStart;

-        for ( int x = 0; x < w; x++ )
+        if ( alpha )

         {
         {

-            // also, the order of RGB is inversed for DIBs
-            *dst++ = src[2];
-            *dst++ = src[1];
-            *dst++ = src[0];
-
-            src += 3;
-
-            if ( alpha )
-                *dst++ = *alpha++;
+            for ( int x = 0; x < w; x++ )
+            {
+                // 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;
+            }
+        }
+        else // no alpha channel
+        {
+            for ( int x = 0; x < w; x++ )
+            {
+                // RGB order is reversed.
+                *dst++ = src[2];
+                *dst++ = src[1];
+                *dst++ = src[0];
+                src += 3;
+            }

         }
 
         // pass to the previous line in the image
         }
 
         // pass to the previous line in the image


@@ -543,5 +705,69 @@ bool wxDIB::Create(const wxImage& image)
     return true;
 }
 
     return true;
 }
 

+wxImage wxDIB::ConvertToImage() const
+{
+    wxCHECK_MSG( IsOk(), wxNullImage,
+                    wxT("can't convert invalid DIB to wxImage") );
+
+    // create the wxImage object
+    const int w = GetWidth();
+    const int h = GetHeight();
+    wxImage image(w, h, false /* don't bother clearing memory */);
+    if ( !image.Ok() )
+    {
+        wxFAIL_MSG( wxT("could not allocate data for image") );
+        return wxNullImage;
+    }
+
+    if ( m_hasAlpha )
+    {
+        image.SetAlpha();
+    }
+
+    // this is the same loop as in Create() just above but with copy direction
+    // reversed
+    const int bpp = GetDepth();
+    const int dstBytesPerLine = w * 3;
+    const int srcBytesPerLine = GetLineSize(w, bpp);
+    unsigned char *dst = image.GetData() + ((h - 1) * dstBytesPerLine);
+    unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() + (h - 1)*w
+                                            : NULL;
+    const bool is32bit = bpp == 32;
+    const unsigned char *srcLineStart = (unsigned char *)GetData();
+    for ( int y = 0; y < h; y++ )
+    {
+        // copy one DIB line
+        const unsigned char *src = srcLineStart;
+        for ( int x = 0; x < w; x++ )
+        {
+            dst[2] = *src++;
+            dst[1] = *src++;
+            dst[0] = *src++;
+
+            dst += 3;
+
+            if ( is32bit )
+            {
+                if ( alpha )
+                    *alpha++ = *src;
+                src++;
+            }
+        }
+
+        // pass to the previous line in the image
+        dst -= 2*dstBytesPerLine;
+        if ( alpha )
+            alpha -= 2*w;
+
+        // and to the next one in the DIB
+        srcLineStart += srcBytesPerLine;
+    }
+
+    return image;
+}
+

 #endif // wxUSE_IMAGE
 
 #endif // wxUSE_IMAGE
 

+#endif // wxUSE_WXDIB
+