X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d80f416f62c1fa60f020a785bee98ce71c749a42..51596bcb982d1147c00f869acf18062ca150fa91:/src/msw/dc.cpp diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp index e36e35dfc8..52e247fce2 100644 --- a/src/msw/dc.cpp +++ b/src/msw/dc.cpp @@ -40,16 +40,20 @@ #include "wx/icon.h" #endif +#include "wx/msw/private.h" // needs to be before #include + #include "wx/sysopt.h" #include "wx/dcprint.h" #include "wx/module.h" #include "wx/dynload.h" +#ifdef wxHAVE_RAW_BITMAP +#include "wx/rawbmp.h" +#endif + #include #include -#include "wx/msw/private.h" // needs to be before #include - #if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__) #include #endif @@ -58,6 +62,10 @@ #include #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)) @@ -109,6 +117,25 @@ static const int MM_METRIC = 10; // convert degrees to radians static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; } +// call AlphaBlend() to blit contents of hdcSrc to hdcDst using alpha +// +// NB: bmpSrc is the bitmap selected in hdcSrc, it is not really needed +// to pass it to this function but as we already have it at the point +// of call anyhow we do +// +// return true if we could draw the bitmap in one way or the other, false +// otherwise +static bool AlphaBlt(HDC hdcDst, + int x, int y, int w, int h, + HDC hdcSrc, + const wxBitmap& bmpSrc); + +#ifdef wxHAVE_RAW_BITMAP +// our (limited) AlphaBlend() replacement +static void +wxAlphaBlend(HDC hdcDst, int x, int y, int w, int h, const wxBitmap& bmp); +#endif + // ---------------------------------------------------------------------------- // private classes // ---------------------------------------------------------------------------- @@ -131,6 +158,8 @@ private: COLORREF m_colFgOld, m_colBgOld; bool m_changed; + + DECLARE_NO_COPY_CLASS(wxColourChanger) }; // this class saves the old stretch blit mode during its life time @@ -140,21 +169,27 @@ public: StretchBltModeChanger(HDC hdc, int mode) : m_hdc(hdc) { +#ifndef __WXWINCE__ m_modeOld = ::SetStretchBltMode(m_hdc, mode); if ( !m_modeOld ) wxLogLastError(_T("SetStretchBltMode")); +#endif } ~StretchBltModeChanger() { +#ifndef __WXWINCE__ if ( !::SetStretchBltMode(m_hdc, m_modeOld) ) wxLogLastError(_T("SetStretchBltMode")); +#endif } private: const HDC m_hdc; int m_modeOld; + + DECLARE_NO_COPY_CLASS(StretchBltModeChanger) }; // =========================================================================== @@ -347,7 +382,7 @@ void wxDC::SetClippingHrgn(WXHRGN hrgn) // note that we combine the new clipping region with the existing one: this // is compatible with what the other ports do and is the documented // behaviour now (starting with 2.3.3) -#ifdef __WIN16__ +#if defined(__WIN16__) || defined(__WXWINCE__) RECT rectClip; if ( !::GetClipBox(GetHdc(), &rectClip) ) return; @@ -483,7 +518,9 @@ void wxDC::Clear() rect.bottom = m_selectedBitmap.GetHeight(); } +#ifndef __WXWINCE__ (void) ::SetMapMode(GetHdc(), MM_TEXT); +#endif DWORD colour = ::GetBkColor(GetHdc()); HBRUSH brush = ::CreateSolidBrush(colour); @@ -493,15 +530,22 @@ void wxDC::Clear() int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX, height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY; +#ifndef __WXWINCE__ ::SetMapMode(GetHdc(), MM_ANISOTROPIC); + ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL); ::SetWindowExtEx(GetHdc(), width, height, NULL); ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL); ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL); +#endif } bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style) { +#ifdef __WXWINCE__ + return FALSE; +#else + #ifdef __WXMICROWIN__ if (!GetHDC()) return FALSE; #endif @@ -530,6 +574,7 @@ bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style) CalcBoundingBox(x, y); return success; +#endif } bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const @@ -559,11 +604,8 @@ void wxDC::DoCrossHair(wxCoord x, wxCoord y) wxCoord x2 = x+VIEWPORT_EXTENT; wxCoord y2 = y+VIEWPORT_EXTENT; - (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL); - (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y)); - - (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL); - (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2)); + wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y)); + wxDrawLine(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), XLOG2DEV(x), YLOG2DEV(y2)); CalcBoundingBox(x1, y1); CalcBoundingBox(x2, y2); @@ -575,8 +617,7 @@ void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) if (!GetHDC()) return; #endif - (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL); - (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2)); + wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2)); CalcBoundingBox(x1, y1); CalcBoundingBox(x2, y2); @@ -588,6 +629,10 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord xc, wxCoord yc) { +#ifdef __WXWINCE__ + // FIXME: emulate Arc +#else + #ifdef __WXMICROWIN__ if (!GetHDC()) return; #endif @@ -635,6 +680,7 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1, CalcBoundingBox(xc - r, yc - r); CalcBoundingBox(xc + r, yc + r); +#endif } void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1, @@ -647,14 +693,18 @@ void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1, wxCoord x2 = x1 + width, y2 = y1 + height; -#if defined(__WIN32__) && !defined(__SC__) && !defined(__WXMICROWIN__) +#if defined(__WIN32__) && !defined(__SYMANTEC__) && !defined(__WXMICROWIN__) RECT rect; rect.left = x1; rect.top = y1; rect.right = x2; rect.bottom = y2; +#ifdef __WXWINCE__ + DrawFrameControl(GetHdc(), &rect, DFC_BUTTON, DFCS_BUTTONCHECK); +#else DrawFrameControl(GetHdc(), &rect, DFC_MENU, DFCS_MENUCHECK); +#endif #else // Win16 // In WIN16, draw a cross HPEN blackPen = ::CreatePen(PS_SOLID, 1, RGB(0, 0, 0)); @@ -713,9 +763,13 @@ void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffs CalcBoundingBox(cpoints[i].x, cpoints[i].y); } +#ifndef __WXWINCE__ int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING); +#endif (void)Polygon(GetHdc(), cpoints, n); +#ifndef __WXWINCE__ SetPolyFillMode(GetHdc(),prev); +#endif delete[] cpoints; } else @@ -724,9 +778,13 @@ void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffs for (i = 0; i < n; i++) CalcBoundingBox(points[i].x, points[i].y); +#ifndef __WXWINCE__ int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING); +#endif (void)Polygon(GetHdc(), (POINT*) points, n); +#ifndef __WXWINCE__ SetPolyFillMode(GetHdc(),prev); +#endif } } @@ -862,6 +920,10 @@ void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height) // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea) { +#ifdef __WXWINCE__ + // FIXME +#else + #ifdef __WXMICROWIN__ if (!GetHDC()) return; #endif @@ -905,6 +967,7 @@ void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,d CalcBoundingBox(x, y); CalcBoundingBox(x2, y2); +#endif } void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y) @@ -942,69 +1005,14 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask 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)); - -#ifndef AC_SRC_ALPHA - #define AC_SRC_ALPHA 1 -#endif - - 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")); - } + MemoryHDC hdcMem; + SelectInHDC select(hdcMem, GetHbitmapOf(bmp)); + if ( AlphaBlt(GetHdc(), x, y, width, height, hdcMem, bmp) ) return; - } - //else: AlphaBlend() not available } -#endif // defined(AC_SRC_OVER) if ( useMask ) { @@ -1150,11 +1158,19 @@ void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y) SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT : OPAQUE); +#ifdef __WXWINCE__ + if ( ::ExtTextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), 0, NULL, + text.c_str(), text.length(), NULL) == 0 ) + { + wxLogLastError(wxT("TextOut")); + } +#else if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), text.c_str(), text.length()) == 0 ) { wxLogLastError(wxT("TextOut")); } +#endif // restore the old parameters (text foreground colour may be left because // it never is set to anything else, but background should remain @@ -1427,40 +1443,9 @@ void wxDC::SetBackground(const wxBrush& brush) m_backgroundBrush = brush; - if (!m_backgroundBrush.Ok()) - return; - - if (m_canvas) + if ( m_backgroundBrush.Ok() ) { - bool customColours = TRUE; - // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to - // change background colours from the control-panel specified colours. - if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS)) - customColours = FALSE; - - if (customColours) - { - if (m_backgroundBrush.GetStyle()==wxTRANSPARENT) - { - m_canvas->SetTransparent(TRUE); - } - else - { - // New behaviour, 10/2/99: setting the background brush of a DC - // doesn't affect the window background colour. However, - // I'm leaving in the transparency setting because it's needed by - // various controls (e.g. wxStaticText) to determine whether to draw - // transparently or not. TODO: maybe this should be a new function - // wxWindow::SetTransparency(). Should that apply to the child itself, or the - // parent? - // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour()); - m_canvas->SetTransparent(FALSE); - } - } - } - COLORREF new_color = m_backgroundBrush.GetColour().GetPixel(); - { - (void)SetBkColor(GetHdc(), new_color); + (void)SetBkColor(GetHdc(), m_backgroundBrush.GetColour().GetPixel()); } } @@ -1643,8 +1628,8 @@ void wxDC::SetMapMode(int mode) return; } - double mm2pixelsX = pixel_width / mm_width, - mm2pixelsY = pixel_height / mm_height; + double mm2pixelsX = (double)pixel_width / mm_width, + mm2pixelsY = (double)pixel_height / mm_height; switch (mode) { @@ -1676,6 +1661,7 @@ void wxDC::SetMapMode(int mode) // VZ: it seems very wasteful to always use MM_ANISOTROPIC when in 99% of // cases we could do with MM_TEXT and in the remaining 0.9% with // MM_ISOTROPIC (TODO!) +#ifndef __WXWINCE__ ::SetMapMode(GetHdc(), MM_ANISOTROPIC); int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX, @@ -1686,6 +1672,7 @@ void wxDC::SetMapMode(int mode) ::SetViewportOrgEx(GetHdc(), m_deviceOriginX, m_deviceOriginY, NULL); ::SetWindowOrgEx(GetHdc(), m_logicalOriginX, m_logicalOriginY, NULL); +#endif } void wxDC::SetUserScale(double x, double y) @@ -1694,6 +1681,7 @@ void wxDC::SetUserScale(double x, double y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ if ( x == m_userScaleX && y == m_userScaleY ) return; @@ -1701,6 +1689,7 @@ void wxDC::SetUserScale(double x, double y) m_userScaleY = y; SetMapMode(m_mappingMode); +#endif } void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp) @@ -1709,6 +1698,7 @@ void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ int signX = xLeftRight ? 1 : -1, signY = yBottomUp ? -1 : 1; @@ -1719,6 +1709,7 @@ void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp) SetMapMode(m_mappingMode); } +#endif } void wxDC::SetSystemScale(double x, double y) @@ -1727,6 +1718,7 @@ void wxDC::SetSystemScale(double x, double y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ if ( x == m_scaleX && y == m_scaleY ) return; @@ -1734,6 +1726,7 @@ void wxDC::SetSystemScale(double x, double y) m_scaleY = y; SetMapMode(m_mappingMode); +#endif } void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y) @@ -1742,6 +1735,7 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ if ( x == m_logicalOriginX && y == m_logicalOriginY ) return; @@ -1749,6 +1743,7 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y) m_logicalOriginY = y; ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL); +#endif } void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) @@ -1757,6 +1752,7 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ if ( x == m_deviceOriginX && y == m_deviceOriginY ) return; @@ -1764,6 +1760,7 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) m_deviceOriginY = y; ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL); +#endif } // --------------------------------------------------------------------------- @@ -1824,11 +1821,19 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, int rop, bool useMask, wxCoord xsrcMask, wxCoord ysrcMask) { + wxCHECK_MSG( source, FALSE, _T("wxDC::Blit(): NULL wxDC pointer") ); + #ifdef __WXMICROWIN__ if (!GetHDC()) return FALSE; #endif const wxBitmap& bmpSrc = source->m_selectedBitmap; + if ( bmpSrc.Ok() && bmpSrc.HasAlpha() ) + { + if ( AlphaBlt(GetHdc(), xdest, ydest, width, height, + GetHdcOf(*source), bmpSrc) ) + return TRUE; + } wxMask *mask = NULL; if ( useMask ) @@ -2001,6 +2006,9 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, { // if we already have a DIB, draw it using StretchDIBits(), otherwise // use StretchBlt() if available and finally fall back to BitBlt() + + // FIXME: use appropriate WinCE functions +#ifndef __WXWINCE__ const int caps = ::GetDeviceCaps(GetHdc(), RASTERCAPS); if ( bmpSrc.Ok() && (caps & RC_STRETCHDIB) ) { @@ -2073,6 +2081,8 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, success = TRUE; } } +#endif + // __WXWINCE__ } ::SetTextColor(GetHdc(), old_textground); @@ -2146,6 +2156,10 @@ void wxDC::SetLogicalScale(double x, double y) m_logicalScaleY = y; } +// ---------------------------------------------------------------------------- +// DC caching +// ---------------------------------------------------------------------------- + #if wxUSE_DC_CACHEING /* @@ -2186,10 +2200,10 @@ wxDCCacheEntry::~wxDCCacheEntry() wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h) { int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL); - wxNode* node = sm_bitmapCache.First(); + wxList::compatibility_iterator node = sm_bitmapCache.GetFirst(); while (node) { - wxDCCacheEntry* entry = (wxDCCacheEntry*) node->Data(); + wxDCCacheEntry* entry = (wxDCCacheEntry*) node->GetData(); if (entry->m_depth == depth) { @@ -2207,7 +2221,7 @@ wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h) return entry; } - node = node->Next(); + node = node->GetNext(); } WXHBITMAP hBitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h); if ( !hBitmap) @@ -2222,10 +2236,10 @@ wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h) wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc) { int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL); - wxNode* node = sm_dcCache.First(); + wxList::compatibility_iterator 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)) @@ -2236,7 +2250,7 @@ wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc) } } - node = node->Next(); + node = node->GetNext(); } WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc); if ( !hDC) @@ -2260,12 +2274,8 @@ void wxDC::AddToDCCache(wxDCCacheEntry* entry) void wxDC::ClearCache() { - sm_dcCache.DeleteContents(TRUE); - sm_dcCache.Clear(); - sm_dcCache.DeleteContents(FALSE); - sm_bitmapCache.DeleteContents(TRUE); - sm_bitmapCache.Clear(); - sm_bitmapCache.DeleteContents(FALSE); + WX_CLEAR_LIST(wxList, sm_dcCache); + WX_CLEAR_LIST(wxList, sm_bitmapCache); } // Clean up cache at app exit @@ -2281,6 +2291,143 @@ private: IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule) -#endif - // wxUSE_DC_CACHEING +#endif // wxUSE_DC_CACHEING + +// ---------------------------------------------------------------------------- +// alpha channel support +// ---------------------------------------------------------------------------- + +static bool AlphaBlt(HDC hdcDst, + int x, int y, int width, int height, + HDC hdcSrc, + const wxBitmap& bmp) +{ + wxASSERT_MSG( bmp.Ok() && bmp.HasAlpha(), _T("AlphaBlt(): invalid bitmap") ); + wxASSERT_MSG( hdcDst && hdcSrc, _T("AlphaBlt(): invalid HDC") ); + + // do we have AlphaBlend() and company in the headers? +#if defined(AC_SRC_OVER) && wxUSE_DYNLIB_CLASS + // 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 ) + { + BLENDFUNCTION bf; + bf.BlendOp = AC_SRC_OVER; + bf.BlendFlags = 0; + bf.SourceConstantAlpha = 0xff; + bf.AlphaFormat = AC_SRC_ALPHA; + + if ( pfnAlphaBlend(hdcDst, x, y, width, height, + hdcSrc, 0, 0, width, height, + bf) ) + { + // skip wxAlphaBlend() call below + return TRUE; + } + + wxLogLastError(_T("AlphaBlend")); + } +#endif // defined(AC_SRC_OVER) + + // AlphaBlend() unavailable of failed: use our own (probably much slower) + // implementation +#ifdef wxHAVE_RAW_BITMAP + wxAlphaBlend(hdcDst, x, y, width, height, bmp); + + return TRUE; +#else // !wxHAVE_RAW_BITMAP + // no wxAlphaBlend() neither, fall back to using simple BitBlt() (we lose + // alpha but at least something will be shown like this) + return FALSE; +#endif // wxHAVE_RAW_BITMAP +} + + +// wxAlphaBlend: our fallback if ::AlphaBlend() is unavailable +#ifdef wxHAVE_RAW_BITMAP + +static void +wxAlphaBlend(HDC hdcDst, int xDst, int yDst, int w, int h, const wxBitmap& bmpSrc) +{ + // get the destination DC pixels + wxBitmap bmpDst(w, h, 32 /* force creating RGBA DIB */); + MemoryHDC hdcMem; + SelectInHDC select(hdcMem, GetHbitmapOf(bmpDst)); + + if ( !::BitBlt(hdcMem, 0, 0, w, h, hdcDst, 0, 0, SRCCOPY) ) + { + wxLogLastError(_T("BitBlt")); + } + + // combine them with the source bitmap using alpha + wxAlphaPixelData dataDst(bmpDst), + dataSrc((wxBitmap &)bmpSrc); + + wxCHECK_RET( dataDst && dataSrc, + _T("failed to get raw data in wxAlphaBlend") ); + + wxAlphaPixelData::Iterator pDst(dataDst), + pSrc(dataSrc); + + for ( int y = 0; y < h; y++ ) + { + wxAlphaPixelData::Iterator 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(dataDst, 1); + pSrc.OffsetY(dataSrc, 1); + } + + // and finally blit them back to the destination DC + if ( !::BitBlt(hdcDst, xDst, yDst, w, h, hdcMem, 0, 0, SRCCOPY) ) + { + wxLogLastError(_T("BitBlt")); + } +} +#endif // #ifdef wxHAVE_RAW_BITMAP