// Modified by:
// Created: 01/02/97
// RCS-ID: $Id$
-// Copyright: (c) Julian Smart and Markus Holzem
+// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#include "wx/sysopt.h"
#include "wx/dcprint.h"
#include "wx/module.h"
+#include "wx/dynload.h"
+#include "wx/rawbmp.h"
#include <string.h>
#include <math.h>
#include <print.h>
#endif
+#ifndef AC_SRC_ALPHA
+#define AC_SRC_ALPHA 1
+#endif
+
/* Quaternary raster codes */
#ifndef MAKEROP4
#define MAKEROP4(fore,back) (DWORD)((((back) << 8) & 0xFF000000) | (fore))
// convert degrees to radians
static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
+// our (limited) AlphaBlend() replacement
+static void
+wxAlphaBlend(wxDC& dc, int x, int y, int w, int h, const wxBitmap& bmp);
+
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
if (m_oldBitmap)
{
::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
+#ifdef __WXDEBUG__
if (m_selectedBitmap.Ok())
{
m_selectedBitmap.SetSelectedInto(NULL);
}
+#endif
}
m_oldBitmap = 0;
if (m_oldPen)
HPALETTE oldPal = 0;
#endif // wxUSE_PALETTE
+ // do we have AlphaBlend() and company in the headers?
+#ifdef AC_SRC_OVER
+ if ( bmp.HasAlpha() )
+ {
+ // yes, now try to see if we have it during run-time
+
+ typedef BOOL (WINAPI *AlphaBlend_t)(HDC,int,int,int,int,
+ HDC,int,int,int,int,
+ BLENDFUNCTION);
+
+ // bitmaps can be drawn only from GUI thread so there is no need to
+ // protect this static variable from multiple threads
+ static bool s_triedToLoad = FALSE;
+ static AlphaBlend_t pfnAlphaBlend = NULL;
+ if ( !s_triedToLoad )
+ {
+ s_triedToLoad = TRUE;
+
+ // don't give errors about the DLL being unavailable, we're
+ // prepared to handle this
+ wxLogNull nolog;
+
+ wxDynamicLibrary dll(_T("msimg32.dll"));
+ if ( dll.IsLoaded() )
+ {
+ pfnAlphaBlend = (AlphaBlend_t)dll.GetSymbol(_T("AlphaBlend"));
+ if ( pfnAlphaBlend )
+ {
+ // we must keep the DLL loaded if we want to be able to
+ // call AlphaBlend() so just never unload it at all, not a
+ // big deal
+ dll.Detach();
+ }
+ }
+ }
+
+ if ( pfnAlphaBlend )
+ {
+ MemoryHDC hdcMem;
+ SelectInHDC select(hdcMem, GetHbitmapOf(bmp));
+
+ BLENDFUNCTION bf;
+ bf.BlendOp = AC_SRC_OVER;
+ bf.BlendFlags = 0;
+ bf.SourceConstantAlpha = 0xff;
+ bf.AlphaFormat = AC_SRC_ALPHA;
+
+ if ( !pfnAlphaBlend(GetHdc(), x, y, width, height,
+ hdcMem, 0, 0, width, height,
+ bf) )
+ {
+ wxLogLastError(_T("AlphaBlend"));
+ }
+ }
+ else // use our own (probably much slower) implementation
+ {
+ wxAlphaBlend(*this, x, y, width, height, bmp);
+ }
+
+ return;
+ }
+#endif // defined(AC_SRC_OVER)
+
if ( useMask )
{
wxMask *mask = bmp.GetMask();
if (!GetHDC()) return FALSE;
#endif
+ const wxBitmap& bmpSrc = source->m_selectedBitmap;
+
wxMask *mask = NULL;
if ( useMask )
{
- const wxBitmap& bmp = source->m_selectedBitmap;
- mask = bmp.GetMask();
+ mask = bmpSrc.GetMask();
- if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
+ if ( !(bmpSrc.Ok() && mask && mask->GetMaskBitmap()) )
{
// don't give assert here because this would break existing
// programs - just silently ignore useMask parameter
}
else // no mask, just BitBlt() it
{
- // use StretchBlt() if available
- if ( ::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHBLT )
+ // if we already have a DIB, draw it using StretchDIBits(), otherwise
+ // use StretchBlt() if available and finally fall back to BitBlt()
+ const int caps = ::GetDeviceCaps(GetHdc(), RASTERCAPS);
+ if ( bmpSrc.Ok() && (caps & RC_STRETCHDIB) )
{
- StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
+ DIBSECTION ds;
+ wxZeroMemory(ds);
- success = ::StretchBlt
- (
- GetHdc(),
- xdest, ydest, width, height,
- GetHdcOf(*source),
- xsrc, ysrc, width, height,
- dwRop
- ) != 0;
+ if ( ::GetObject(GetHbitmapOf(bmpSrc),
+ sizeof(ds),
+ &ds) == sizeof(ds) )
+ {
+ StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
+
+ if ( ::StretchDIBits(GetHdc(),
+ xdest, ydest,
+ width, height,
+ 0, 0,
+ width, height,
+ ds.dsBm.bmBits,
+ (LPBITMAPINFO)&ds.dsBmih,
+ DIB_RGB_COLORS,
+ SRCCOPY
+ ) == (int)GDI_ERROR )
+ {
+ wxLogLastError(wxT("StretchDIBits"));
+ }
+ else
+ {
+ success = TRUE;
+ }
+ }
}
- else
+
+ if ( !success && (caps & RC_STRETCHBLT) )
{
- success = ::BitBlt
- (
- GetHdc(),
- xdest, ydest,
- (int)width, (int)height,
- GetHdcOf(*source),
- xsrc, ysrc,
- dwRop
- ) != 0;
+ StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
+
+ if ( !::StretchBlt
+ (
+ GetHdc(),
+ xdest, ydest, width, height,
+ GetHdcOf(*source),
+ xsrc, ysrc, width, height,
+ dwRop
+ ) )
+ {
+ wxLogLastError(_T("StretchBlt"));
+ }
+ else
+ {
+ success = TRUE;
+ }
}
if ( !success )
{
- wxLogLastError(wxT("BitBlt/StretchBlt"));
+ if ( !::BitBlt
+ (
+ GetHdc(),
+ xdest, ydest,
+ (int)width, (int)height,
+ GetHdcOf(*source),
+ xsrc, ysrc,
+ dwRop
+ ) )
+ {
+ wxLogLastError(_T("BitBlt"));
+ }
+ else
+ {
+ success = TRUE;
+ }
}
}
m_logicalScaleY = y;
}
-#if WXWIN_COMPATIBILITY
-void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
- float *descent, float *externalLeading,
- wxFont *theFont, bool use16bit) const
-{
-#ifdef __WXMICROWIN__
- if (!GetHDC()) return;
-#endif
-
- wxCoord x1, y1, descent1, externalLeading1;
- GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
- *x = x1; *y = y1;
- if (descent)
- *descent = descent1;
- if (externalLeading)
- *externalLeading = externalLeading1;
-}
-#endif
+// ----------------------------------------------------------------------------
+// DC caching
+// ----------------------------------------------------------------------------
#if wxUSE_DC_CACHEING
wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h)
{
int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
- wxNode* node = sm_bitmapCache.First();
+ wxNode* node = sm_bitmapCache.GetFirst();
while (node)
{
- wxDCCacheEntry* entry = (wxDCCacheEntry*) node->Data();
+ wxDCCacheEntry* entry = (wxDCCacheEntry*) node->GetData();
if (entry->m_depth == depth)
{
return entry;
}
- node = node->Next();
+ node = node->GetNext();
}
WXHBITMAP hBitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h);
if ( !hBitmap)
wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc)
{
int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
- wxNode* node = sm_dcCache.First();
+ wxNode* node = sm_dcCache.GetFirst();
while (node)
{
- wxDCCacheEntry* entry = (wxDCCacheEntry*) node->Data();
+ wxDCCacheEntry* entry = (wxDCCacheEntry*) node->GetData();
// Don't return the same one as we already have
if (!notThis || (notThis != entry))
}
}
- node = node->Next();
+ node = node->GetNext();
}
WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc);
if ( !hDC)
IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule)
-#endif
- // wxUSE_DC_CACHEING
+#endif // wxUSE_DC_CACHEING
+
+// ----------------------------------------------------------------------------
+// wxAlphaBlend: our fallback if ::AlphaBlend() is unavailable
+// ----------------------------------------------------------------------------
+
+static void
+wxAlphaBlend(wxDC& dc, int xDst, int yDst, int w, int h, const wxBitmap& bmpSrc)
+{
+ // get the destination DC pixels
+ wxBitmap bmpDst(w, h, 32);
+ MemoryHDC hdcMem;
+ SelectInHDC select(hdcMem, GetHbitmapOf(bmpDst));
+
+ if ( !::BitBlt(hdcMem, 0, 0, w, h, GetHdcOf(dc), 0, 0, SRCCOPY) )
+ {
+ wxLogLastError(_T("BitBlt"));
+ }
+
+ // combine them with the source bitmap using alpha
+ wxRawBitmapData dataDst(bmpDst),
+ dataSrc(bmpSrc);
+
+ wxRawBitmapIterator pDst(dataDst),
+ pSrc(dataSrc);
+
+ for ( int y = 0; y < h; y++ )
+ {
+ wxRawBitmapIterator pDstRowStart = pDst,
+ pSrcRowStart = pSrc;
+
+ for ( int x = 0; x < w; x++ )
+ {
+ // note that source bitmap uses premultiplied alpha (as required by
+ // the real AlphaBlend)
+ const unsigned beta = 255 - pSrc.Alpha();
+
+ pDst.Red() = pSrc.Red() + (beta * pDst.Red() + 127) / 255;
+ pDst.Blue() = pSrc.Blue() + (beta * pDst.Blue() + 127) / 255;
+ pDst.Green() = pSrc.Green() + (beta * pDst.Green() + 127) / 255;
+
+ ++pDst;
+ ++pSrc;
+ }
+
+ pDst = pDstRowStart;
+ pSrc = pSrcRowStart;
+ pDst.OffsetY(1);
+ pSrc.OffsetY(1);
+ }
+
+ // and finally blit them back to the destination DC
+ if ( !::BitBlt(GetHdcOf(dc), xDst, yDst, w, h, hdcMem, 0, 0, SRCCOPY) )
+ {
+ wxLogLastError(_T("BitBlt"));
+ }
+}
projects / wxWidgets.git / blobdiff