X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/faa1ae782dfb37e12607e200c5c2b8f04d3f31ca..f35746ceeda33434574d667f81d7e6e8b18b7c46:/src/msw/dc.cpp?ds=sidebyside diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp index 80668e7755..7d596522de 100644 --- a/src/msw/dc.cpp +++ b/src/msw/dc.cpp @@ -5,7 +5,7 @@ // Modified by: // Created: 01/02/97 // RCS-ID: $Id$ -// Copyright: (c) Julian Smart and Markus Holzem +// Copyright: (c) Julian Smart // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -43,13 +43,18 @@ #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 +#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__) #include #endif @@ -57,6 +62,15 @@ #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)) +#endif + IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase) // --------------------------------------------------------------------------- @@ -77,6 +91,25 @@ static const int MM_METRIC = 10; // MSDN docs for how this and other numbers in wxDC::Blit() are obtained) #define DSTCOPY 0x00AA0029 // a.k.a. NOP operation +// ---------------------------------------------------------------------------- +// macros for logical <-> device coords conversion +// ---------------------------------------------------------------------------- + +/* + We currently let Windows do all the translations itself so these macros are + not really needed (any more) but keep them to enhance readability of the + code by allowing to see where are the logical and where are the device + coordinates used. + */ + +// logical to device +#define XLOG2DEV(x) (x) +#define YLOG2DEV(y) (y) + +// device to logical +#define XDEV2LOG(x) (x) +#define YDEV2LOG(y) (y) + // --------------------------------------------------------------------------- // private functions // --------------------------------------------------------------------------- @@ -84,6 +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 // ---------------------------------------------------------------------------- @@ -108,6 +160,34 @@ private: bool m_changed; }; +// this class saves the old stretch blit mode during its life time +class StretchBltModeChanger +{ +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; +}; + // =========================================================================== // implementation // =========================================================================== @@ -118,7 +198,8 @@ private: wxColourChanger::wxColourChanger(wxDC& dc) : m_dc(dc) { - if ( dc.GetBrush().GetStyle() == wxSTIPPLE_MASK_OPAQUE ) + const wxBrush& brush = dc.GetBrush(); + if ( brush.Ok() && brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE ) { HDC hdc = GetHdcOf(dc); m_colFgOld = ::GetTextColor(hdc); @@ -184,12 +265,8 @@ wxDC::wxDC() m_bOwnsDC = FALSE; m_hDC = 0; - - m_windowExtX = VIEWPORT_EXTENT; - m_windowExtY = VIEWPORT_EXTENT; } - wxDC::~wxDC() { if ( m_hDC != 0 ) @@ -227,10 +304,12 @@ void wxDC::SelectOldObjects(WXHDC dc) 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) @@ -279,7 +358,7 @@ void wxDC::UpdateClipBox() #endif RECT rect; - GetClipBox(GetHdc(), &rect); + ::GetClipBox(GetHdc(), &rect); m_clipX1 = (wxCoord) XDEV2LOG(rect.left); m_clipY1 = (wxCoord) YDEV2LOG(rect.top); @@ -287,14 +366,50 @@ void wxDC::UpdateClipBox() m_clipY2 = (wxCoord) YDEV2LOG(rect.bottom); } -void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h) +// common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion() +void wxDC::SetClippingHrgn(WXHRGN hrgn) { + wxCHECK_RET( hrgn, wxT("invalid clipping region") ); + #ifdef __WXMICROWIN__ - if (!GetHDC()) return; -#endif + if (!GetHdc()) return; +#endif // __WXMICROWIN__ + + // 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) +#if defined(__WIN16__) || defined(__WXWINCE__) + RECT rectClip; + if ( !::GetClipBox(GetHdc(), &rectClip) ) + return; + + HRGN hrgnDest = ::CreateRectRgn(0, 0, 0, 0); + HRGN hrgnClipOld = ::CreateRectRgn(rectClip.left, rectClip.top, + rectClip.right, rectClip.bottom); + + if ( ::CombineRgn(hrgnDest, hrgnClipOld, (HRGN)hrgn, RGN_AND) != ERROR ) + { + ::SelectClipRgn(GetHdc(), hrgnDest); + } + + ::DeleteObject(hrgnClipOld); + ::DeleteObject(hrgnDest); +#else // Win32 + if ( ::ExtSelectClipRgn(GetHdc(), (HRGN)hrgn, RGN_AND) == ERROR ) + { + wxLogLastError(_T("ExtSelectClipRgn")); + + return; + } +#endif // Win16/32 m_clipping = TRUE; + UpdateClipBox(); +} + +void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h) +{ // the region coords are always the device ones, so do the translation // manually // @@ -309,33 +424,15 @@ void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h) } else { - if ( ::SelectClipRgn(GetHdc(), hrgn) == ERROR ) - { - wxLogLastError(_T("SelectClipRgn")); - } - DeleteObject(hrgn); + SetClippingHrgn((WXHRGN)hrgn); - UpdateClipBox(); + ::DeleteObject(hrgn); } } void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region) { -#ifdef __WXMICROWIN__ - if (!GetHDC()) return; -#endif - - wxCHECK_RET( GetHrgnOf(region), wxT("invalid clipping region") ); - - m_clipping = TRUE; - -#ifdef __WIN16__ - SelectClipRgn(GetHdc(), GetHrgnOf(region)); -#else // Win32 - ExtSelectClipRgn(GetHdc(), GetHrgnOf(region), RGN_AND); -#endif // Win16/32 - - UpdateClipBox(); + SetClippingHrgn(region.GetHRGN()); } void wxDC::DestroyClippingRegion() @@ -347,11 +444,12 @@ void wxDC::DestroyClippingRegion() if (m_clipping && m_hDC) { // TODO: this should restore the previous clipping region, - // so that OnPaint processing works correctly, and the update clipping region - // doesn't get destroyed after the first DestroyClippingRegion. + // so that OnPaint processing works correctly, and the update + // clipping region doesn't get destroyed after the first + // DestroyClippingRegion. HRGN rgn = CreateRectRgn(0, 0, 32000, 32000); - SelectClipRgn(GetHdc(), rgn); - DeleteObject(rgn); + ::SelectClipRgn(GetHdc(), rgn); + ::DeleteObject(rgn); } m_clipping = FALSE; @@ -416,30 +514,43 @@ void wxDC::Clear() rect.bottom = m_selectedBitmap.GetHeight(); } +#ifndef __WXWINCE__ (void) ::SetMapMode(GetHdc(), MM_TEXT); +#endif + + DWORD colour = ::GetBkColor(GetHdc()); + HBRUSH brush = ::CreateSolidBrush(colour); + ::FillRect(GetHdc(), &rect, brush); + ::DeleteObject(brush); - DWORD colour = GetBkColor(GetHdc()); - HBRUSH brush = CreateSolidBrush(colour); - FillRect(GetHdc(), &rect, brush); - DeleteObject(brush); + 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(), m_windowExtX, m_windowExtY, 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 } -void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style) +bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style) { +#ifdef __WXWINCE__ + return FALSE; +#else + #ifdef __WXMICROWIN__ - if (!GetHDC()) return; + if (!GetHDC()) return FALSE; #endif - if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), + bool success = (0 != ::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), col.GetPixel(), style == wxFLOOD_SURFACE ? FLOODFILLSURFACE - : FLOODFILLBORDER) ) + : FLOODFILLBORDER) ) ; + if (!success) { // quoting from the MSDN docs: // @@ -457,6 +568,9 @@ void 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 @@ -486,11 +600,8 @@ 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); @@ -502,12 +613,7 @@ 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)); - - // Normalization: Windows doesn't draw the last point of the line. - // But apparently neither does GTK+, so we take it out again. -// (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2)); + wxDrawLine(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2)); CalcBoundingBox(x1, y1); CalcBoundingBox(x2, y2); @@ -519,6 +625,10 @@ 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 @@ -566,6 +676,7 @@ 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, @@ -578,14 +689,18 @@ 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)); @@ -644,9 +759,13 @@ 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 @@ -655,9 +774,13 @@ 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 } } @@ -793,6 +916,10 @@ 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 @@ -836,6 +963,7 @@ 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) @@ -873,6 +1001,15 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask HPALETTE oldPal = 0; #endif // wxUSE_PALETTE + if ( bmp.HasAlpha() ) + { + MemoryHDC hdcMem; + SelectInHDC select(hdcMem, GetHbitmapOf(bmp)); + + if ( AlphaBlt(GetHdc(), x, y, width, height, hdcMem, bmp) ) + return; + } + if ( useMask ) { wxMask *mask = bmp.GetMask(); @@ -886,7 +1023,6 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask useMask = FALSE; } } - if ( useMask ) { #ifdef __WIN32__ @@ -902,13 +1038,12 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask { HDC cdc = GetHdc(); HDC hdcMem = ::CreateCompatibleDC(GetHdc()); - ::SelectObject(hdcMem, GetHbitmapOf(bmp)); - + HGDIOBJ hOldBitmap = ::SelectObject(hdcMem, GetHbitmapOf(bmp)); #if wxUSE_PALETTE wxPalette *pal = bmp.GetPalette(); if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 ) { - oldPal = ::SelectPalette(hdcMem, GetHpaletteOf(pal), FALSE); + oldPal = ::SelectPalette(hdcMem, GetHpaletteOf(*pal), FALSE); ::RealizePalette(hdcMem); } #endif // wxUSE_PALETTE @@ -923,6 +1058,7 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask ::SelectPalette(hdcMem, oldPal, FALSE); #endif // wxUSE_PALETTE + ::SelectObject(hdcMem, hOldBitmap); ::DeleteDC(hdcMem); } @@ -959,15 +1095,15 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask } #if wxUSE_PALETTE - wxPalette *pal = bmp.GetPalette(); - if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 ) - { - oldPal = ::SelectPalette(memdc, GetHpaletteOf(pal), FALSE); - ::RealizePalette(memdc); - } + wxPalette *pal = bmp.GetPalette(); + if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 ) + { + oldPal = ::SelectPalette(memdc, GetHpaletteOf(*pal), FALSE); + ::RealizePalette(memdc); + } #endif // wxUSE_PALETTE - ::SelectObject( memdc, hbitmap ); + HGDIOBJ hOldBitmap = ::SelectObject( memdc, hbitmap ); ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY); #if wxUSE_PALETTE @@ -975,6 +1111,7 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask ::SelectPalette(memdc, oldPal, FALSE); #endif // wxUSE_PALETTE + ::SelectObject( memdc, hOldBitmap ); ::DeleteDC( memdc ); ::SetTextColor(GetHdc(), old_textground); @@ -1017,11 +1154,19 @@ 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 @@ -1092,13 +1237,13 @@ void wxDC::DoDrawRotatedText(const wxString& text, // "upper left" and "upper right" CalcBoundingBox(x, y); - CalcBoundingBox(x + w*cos(rad), y - h*sin(rad)); + CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(h*sin(rad))); // "bottom left" and "bottom right" x += (wxCoord)(h*sin(rad)); y += (wxCoord)(h*cos(rad)); CalcBoundingBox(x, y); - CalcBoundingBox(x + h*sin(rad), y + h*cos(rad)); + CalcBoundingBox(x + wxCoord(h*sin(rad)), y + wxCoord(h*cos(rad))); } #endif } @@ -1109,7 +1254,7 @@ void wxDC::DoDrawRotatedText(const wxString& text, #if wxUSE_PALETTE -void wxDC::SetPalette(const wxPalette& palette) +void wxDC::DoSelectPalette(bool realize) { #ifdef __WXMICROWIN__ if (!GetHDC()) return; @@ -1123,28 +1268,44 @@ void wxDC::SetPalette(const wxPalette& palette) m_oldPalette = 0; } - m_palette = palette; - - if (!m_palette.Ok()) + if ( m_palette.Ok() ) { - // Setting a NULL colourmap is a way of restoring - // the original colourmap - if (m_oldPalette) - { - ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE); - m_oldPalette = 0; - } + HPALETTE oldPal = ::SelectPalette(GetHdc(), + GetHpaletteOf(m_palette), + FALSE); + if (!m_oldPalette) + m_oldPalette = (WXHPALETTE) oldPal; - return; + if (realize) + ::RealizePalette(GetHdc()); + } +} + +void wxDC::SetPalette(const wxPalette& palette) +{ + if ( palette.Ok() ) + { + m_palette = palette; + DoSelectPalette(TRUE); } +} - if (m_palette.Ok() && m_palette.GetHPALETTE()) +void wxDC::InitializePalette() +{ + if ( wxDisplayDepth() <= 8 ) { - HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), FALSE); - if (!m_oldPalette) - m_oldPalette = (WXHPALETTE) oldPal; + // look for any window or parent that has a custom palette. If any has + // one then we need to use it in drawing operations + wxWindow *win = m_canvas->GetAncestorWithCustomPalette(); - ::RealizePalette(GetHdc()); + m_hasCustomPalette = win && win->HasCustomPalette(); + if ( m_hasCustomPalette ) + { + m_palette = win->GetPalette(); + + // turn on MSW translation for this palette + DoSelectPalette(); + } } } @@ -1249,12 +1410,12 @@ void wxDC::SetBrush(const wxBrush& brush) if ( stipple && stipple->Ok() ) { #ifdef __WIN32__ - ::SetBrushOrgEx(GetHdc(), + ::SetBrushOrgEx(GetHdc(), m_deviceOriginX % stipple->GetWidth(), m_deviceOriginY % stipple->GetHeight(), NULL); // don't need previous brush origin #else - ::SetBrushOrg(GetHdc(), + ::SetBrushOrg(GetHdc(), m_deviceOriginX % stipple->GetWidth(), m_deviceOriginY % stipple->GetHeight()); #endif @@ -1278,40 +1439,9 @@ void wxDC::SetBackground(const wxBrush& brush) m_backgroundBrush = brush; - if (!m_backgroundBrush.Ok()) - return; - - if (m_canvas) - { - 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(); + if ( m_backgroundBrush.Ok() ) { - (void)SetBkColor(GetHdc(), new_color); + (void)SetBkColor(GetHdc(), m_backgroundBrush.GetColour().GetPixel()); } } @@ -1325,14 +1455,6 @@ void wxDC::SetBackgroundMode(int mode) // SetBackgroundColour now only refers to text background // and m_backgroundMode is used there - -/* - if (m_backgroundMode == wxTRANSPARENT) - ::SetBkMode(GetHdc(), TRANSPARENT); - else - ::SetBkMode(GetHdc(), OPAQUE); - Last change: AC 29 Jan 101 8:54 pm -*/ } void wxDC::SetLogicalFunction(int function) @@ -1412,7 +1534,7 @@ wxCoord wxDC::GetCharHeight() const GetTextMetrics(GetHdc(), &lpTextMetric); - return YDEV2LOGREL(lpTextMetric.tmHeight); + return lpTextMetric.tmHeight; } wxCoord wxDC::GetCharWidth() const @@ -1425,7 +1547,7 @@ wxCoord wxDC::GetCharWidth() const GetTextMetrics(GetHdc(), &lpTextMetric); - return XDEV2LOGREL(lpTextMetric.tmAveCharWidth); + return lpTextMetric.tmAveCharWidth; } void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y, @@ -1435,13 +1557,13 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y, #ifdef __WXMICROWIN__ if (!GetHDC()) { - if (x) *x = 0; - if (y) *y = 0; - if (descent) *descent = 0; - if (externalLeading) *externalLeading = 0; - return; + if (x) *x = 0; + if (y) *y = 0; + if (descent) *descent = 0; + if (externalLeading) *externalLeading = 0; + return; } -#endif +#endif // __WXMICROWIN__ HFONT hfontOld; if ( font ) @@ -1461,10 +1583,14 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y, GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect); GetTextMetrics(GetHdc(), &tm); - if (x) *x = XDEV2LOGREL(sizeRect.cx); - if (y) *y = YDEV2LOGREL(sizeRect.cy); - if (descent) *descent = tm.tmDescent; - if (externalLeading) *externalLeading = tm.tmExternalLeading; + if (x) + *x = sizeRect.cx; + if (y) + *y = sizeRect.cy; + if (descent) + *descent = tm.tmDescent; + if (externalLeading) + *externalLeading = tm.tmExternalLeading; if ( hfontOld ) { @@ -1480,68 +1606,69 @@ void wxDC::SetMapMode(int mode) m_mappingMode = mode; - int pixel_width = 0; - int pixel_height = 0; - int mm_width = 0; - int mm_height = 0; - - pixel_width = GetDeviceCaps(GetHdc(), HORZRES); - pixel_height = GetDeviceCaps(GetHdc(), VERTRES); - mm_width = GetDeviceCaps(GetHdc(), HORZSIZE); - mm_height = GetDeviceCaps(GetHdc(), VERTSIZE); - - if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0)) + if ( mode == wxMM_TEXT ) { - return; + m_logicalScaleX = + m_logicalScaleY = 1.0; } - - double mm2pixelsX = pixel_width/mm_width; - double mm2pixelsY = pixel_height/mm_height; - - switch (mode) + else // need to do some calculations { - case wxMM_TWIPS: - { - m_logicalScaleX = (twips2mm * mm2pixelsX); - m_logicalScaleY = (twips2mm * mm2pixelsY); - break; - } - case wxMM_POINTS: - { - m_logicalScaleX = (pt2mm * mm2pixelsX); - m_logicalScaleY = (pt2mm * mm2pixelsY); - break; - } - case wxMM_METRIC: - { - m_logicalScaleX = mm2pixelsX; - m_logicalScaleY = mm2pixelsY; - break; - } - case wxMM_LOMETRIC: + int pixel_width = ::GetDeviceCaps(GetHdc(), HORZRES), + pixel_height = ::GetDeviceCaps(GetHdc(), VERTRES), + mm_width = ::GetDeviceCaps(GetHdc(), HORZSIZE), + mm_height = ::GetDeviceCaps(GetHdc(), VERTSIZE); + + if ( (mm_width == 0) || (mm_height == 0) ) { - m_logicalScaleX = (mm2pixelsX/10.0); - m_logicalScaleY = (mm2pixelsY/10.0); - break; + // we can't calculate mm2pixels[XY] then! + return; } - default: - case wxMM_TEXT: + + double mm2pixelsX = (double)pixel_width / mm_width, + mm2pixelsY = (double)pixel_height / mm_height; + + switch (mode) { - m_logicalScaleX = 1.0; - m_logicalScaleY = 1.0; - break; + case wxMM_TWIPS: + m_logicalScaleX = twips2mm * mm2pixelsX; + m_logicalScaleY = twips2mm * mm2pixelsY; + break; + + case wxMM_POINTS: + m_logicalScaleX = pt2mm * mm2pixelsX; + m_logicalScaleY = pt2mm * mm2pixelsY; + break; + + case wxMM_METRIC: + m_logicalScaleX = mm2pixelsX; + m_logicalScaleY = mm2pixelsY; + break; + + case wxMM_LOMETRIC: + m_logicalScaleX = mm2pixelsX / 10.0; + m_logicalScaleY = mm2pixelsY / 10.0; + break; + + default: + wxFAIL_MSG( _T("unknown mapping mode in SetMapMode") ); } } - if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC) - ::SetMapMode(GetHdc(), MM_ANISOTROPIC); + // 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); - SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL); - m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT); - m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT); - ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL); - ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL); - ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL); + int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX, + height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY; + + ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL); + ::SetWindowExtEx(GetHdc(), width, height, NULL); + + ::SetViewportOrgEx(GetHdc(), m_deviceOriginX, m_deviceOriginY, NULL); + ::SetWindowOrgEx(GetHdc(), m_logicalOriginX, m_logicalOriginY, NULL); +#endif } void wxDC::SetUserScale(double x, double y) @@ -1550,10 +1677,15 @@ void wxDC::SetUserScale(double x, double y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ + if ( x == m_userScaleX && y == m_userScaleY ) + return; + m_userScaleX = x; m_userScaleY = y; SetMapMode(m_mappingMode); +#endif } void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp) @@ -1562,10 +1694,18 @@ void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp) if (!GetHDC()) return; #endif - m_signX = xLeftRight ? 1 : -1; - m_signY = yBottomUp ? -1 : 1; +#ifndef __WXWINCE__ + int signX = xLeftRight ? 1 : -1, + signY = yBottomUp ? -1 : 1; - SetMapMode(m_mappingMode); + if ( signX != m_signX || signY != m_signY ) + { + m_signX = signX; + m_signY = signY; + + SetMapMode(m_mappingMode); + } +#endif } void wxDC::SetSystemScale(double x, double y) @@ -1574,10 +1714,15 @@ void wxDC::SetSystemScale(double x, double y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ + if ( x == m_scaleX && y == m_scaleY ) + return; + m_scaleX = x; m_scaleY = y; SetMapMode(m_mappingMode); +#endif } void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y) @@ -1586,10 +1731,15 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ + if ( x == m_logicalOriginX && y == m_logicalOriginY ) + return; + m_logicalOriginX = x; m_logicalOriginY = y; ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL); +#endif } void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) @@ -1598,10 +1748,15 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) if (!GetHDC()) return; #endif +#ifndef __WXWINCE__ + if ( x == m_deviceOriginX && y == m_deviceOriginY ) + return; + m_deviceOriginX = x; m_deviceOriginY = y; ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL); +#endif } // --------------------------------------------------------------------------- @@ -1610,46 +1765,46 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y) wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const { - double xRel = x - m_deviceOriginX; - xRel /= m_logicalScaleX*m_userScaleX*m_signX*m_scaleX; - return (wxCoord)(xRel + m_logicalOriginX); + return DeviceToLogicalXRel(x - m_deviceOriginX)*m_signX + m_logicalOriginX; } wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const { - return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX)); + // axis orientation is not taken into account for conversion of a distance + return (wxCoord)(x / (m_logicalScaleX*m_userScaleX*m_scaleX)); } wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const { - double yRel = y - m_deviceOriginY; - yRel /= m_logicalScaleY*m_userScaleY*m_signY*m_scaleY; - return (wxCoord)(yRel + m_logicalOriginY); + return DeviceToLogicalYRel(y - m_deviceOriginY)*m_signY + m_logicalOriginY; } wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const { - return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY)); + // axis orientation is not taken into account for conversion of a distance + return (wxCoord)( y / (m_logicalScaleY*m_userScaleY*m_scaleY)); } wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const { - return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX); + return LogicalToDeviceXRel(x - m_logicalOriginX)*m_signX + m_deviceOriginX; } wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const { - return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX); + // axis orientation is not taken into account for conversion of a distance + return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_scaleX); } wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const { - return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY); + return LogicalToDeviceYRel(y - m_logicalOriginY)*m_signY + m_deviceOriginY; } wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const { - return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY); + // axis orientation is not taken into account for conversion of a distance + return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_scaleY); } // --------------------------------------------------------------------------- @@ -1662,17 +1817,26 @@ 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 ) { - 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 @@ -1737,10 +1901,16 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0) #endif { - success = ::MaskBlt(GetHdc(), xdest, ydest, width, height, - GetHdcOf(*source), xsrc, ysrc, - (HBITMAP)mask->GetMaskBitmap(), xsrcMask, ysrcMask, - MAKEROP4(dwRop, DSTCOPY)) != 0; + success = ::MaskBlt + ( + GetHdc(), + xdest, ydest, width, height, + GetHdcOf(*source), + xsrc, ysrc, + (HBITMAP)mask->GetMaskBitmap(), + xsrcMask, ysrcMask, + MAKEROP4(dwRop, DSTCOPY) + ) != 0; } if ( !success ) @@ -1769,8 +1939,8 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, dc_buffer = ::CreateCompatibleDC(GetHdc()); buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height); #endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING - ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap()); - ::SelectObject(dc_buffer, buffer_bmap); + HGDIOBJ hOldMaskBitmap = ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap()); + HGDIOBJ hOldBufferBitmap = ::SelectObject(dc_buffer, buffer_bmap); // copy dest to buffer if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height, @@ -1816,8 +1986,8 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, } // tidy up temporary DCs and bitmap - ::SelectObject(dc_mask, 0); - ::SelectObject(dc_buffer, 0); + ::SelectObject(dc_mask, hOldMaskBitmap); + ::SelectObject(dc_buffer, hOldBufferBitmap); #if !wxUSE_DC_CACHEING { @@ -1830,14 +2000,87 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, } else // no mask, just BitBlt() it { - success = ::BitBlt(GetHdc(), xdest, ydest, - (int)width, (int)height, - GetHdcOf(*source), xsrc, ysrc, dwRop) != 0; + // 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) ) + { + DIBSECTION ds; + wxZeroMemory(ds); + + 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; + } + } + } + + if ( !success && (caps & RC_STRETCHBLT) ) + { + 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")); + if ( !::BitBlt + ( + GetHdc(), + xdest, ydest, + (int)width, (int)height, + GetHdcOf(*source), + xsrc, ysrc, + dwRop + ) ) + { + wxLogLastError(_T("BitBlt")); + } + else + { + success = TRUE; + } } +#endif + // __WXWINCE__ } + ::SetTextColor(GetHdc(), old_textground); ::SetBkColor(GetHdc(), old_background); @@ -1860,8 +2103,30 @@ void wxDC::DoGetSizeMM(int *w, int *h) const if (!GetHDC()) return; #endif - if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE); - if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE); + // if we implement it in terms of DoGetSize() instead of directly using the + // results returned by GetDeviceCaps(HORZ/VERTSIZE) as was done before, it + // will also work for wxWindowDC and wxClientDC even though their size is + // not the same as the total size of the screen + int wPixels, hPixels; + DoGetSize(&wPixels, &hPixels); + + if ( w ) + { + int wTotal = ::GetDeviceCaps(GetHdc(), HORZRES); + + wxCHECK_RET( wTotal, _T("0 width device?") ); + + *w = (wPixels * ::GetDeviceCaps(GetHdc(), HORZSIZE)) / wTotal; + } + + if ( h ) + { + int hTotal = ::GetDeviceCaps(GetHdc(), VERTRES); + + wxCHECK_RET( hTotal, _T("0 height device?") ); + + *h = (hPixels * ::GetDeviceCaps(GetHdc(), VERTSIZE)) / hTotal; + } } wxSize wxDC::GetPPI() const @@ -1887,24 +2152,9 @@ void wxDC::SetLogicalScale(double x, double y) 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 @@ -1946,10 +2196,10 @@ 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) { @@ -1967,7 +2217,7 @@ 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) @@ -1982,10 +2232,10 @@ 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)) @@ -1996,7 +2246,7 @@ wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc) } } - node = node->Next(); + node = node->GetNext(); } WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc); if ( !hDC) @@ -2020,12 +2270,8 @@ void wxDC::AddToDCCache(wxDCCacheEntry* entry) void wxDC::ClearCache() { - sm_bitmapCache.DeleteContents(TRUE); - sm_bitmapCache.Clear(); - sm_bitmapCache.DeleteContents(FALSE); - sm_dcCache.DeleteContents(TRUE); - sm_dcCache.Clear(); - sm_dcCache.DeleteContents(FALSE); + WX_CLEAR_LIST(wxList, sm_dcCache); + WX_CLEAR_LIST(wxList, sm_bitmapCache); } // Clean up cache at app exit @@ -2041,6 +2287,143 @@ 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