// 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/icon.h"
#endif
+#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
+
#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 <string.h>
#include <math.h>
-#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
-
#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
#include <commdlg.h>
#endif
#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))
+#endif
+
IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
// ---------------------------------------------------------------------------
// 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
// ----------------------------------------------------------------------------
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
+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;
+
+ DECLARE_NO_COPY_CLASS(StretchBltModeChanger)
};
// ===========================================================================
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)
// 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;
rect.bottom = m_selectedBitmap.GetHeight();
}
+#ifndef __WXWINCE__
(void) ::SetMapMode(GetHdc(), MM_TEXT);
+#endif
DWORD colour = ::GetBkColor(GetHdc());
HBRUSH brush = ::CreateSolidBrush(colour);
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
}
-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:
//
}
CalcBoundingBox(x, y);
+
+ return success;
+#endif
}
bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
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);
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);
wxCoord x2, wxCoord y2,
wxCoord xc, wxCoord yc)
{
+#ifdef __WXWINCE__
+ // FIXME: emulate Arc
+#else
+
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
CalcBoundingBox(xc - r, yc - r);
CalcBoundingBox(xc + r, yc + r);
+#endif
}
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));
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
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
}
}
// 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
CalcBoundingBox(x, y);
CalcBoundingBox(x2, y2);
+#endif
}
void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
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();
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
// "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
}
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());
}
}
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)
{
// 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,
::SetViewportOrgEx(GetHdc(), m_deviceOriginX, m_deviceOriginY, NULL);
::SetWindowOrgEx(GetHdc(), m_logicalOriginX, m_logicalOriginY, NULL);
+#endif
}
void wxDC::SetUserScale(double x, double y)
if (!GetHDC()) return;
#endif
+#ifndef __WXWINCE__
if ( x == m_userScaleX && y == m_userScaleY )
return;
m_userScaleY = y;
SetMapMode(m_mappingMode);
+#endif
}
void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
if (!GetHDC()) return;
#endif
+#ifndef __WXWINCE__
int signX = xLeftRight ? 1 : -1,
signY = yBottomUp ? -1 : 1;
SetMapMode(m_mappingMode);
}
+#endif
}
void wxDC::SetSystemScale(double x, double y)
if (!GetHDC()) return;
#endif
+#ifndef __WXWINCE__
if ( x == m_scaleX && y == m_scaleY )
return;
m_scaleY = y;
SetMapMode(m_mappingMode);
+#endif
}
void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
if (!GetHDC()) return;
#endif
+#ifndef __WXWINCE__
if ( x == m_logicalOriginX && y == m_logicalOriginY )
return;
m_logicalOriginY = y;
::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
+#endif
}
void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
if (!GetHDC()) return;
#endif
+#ifndef __WXWINCE__
if ( x == m_deviceOriginX && y == m_deviceOriginY )
return;
m_deviceOriginY = y;
::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
+#endif
}
// ---------------------------------------------------------------------------
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
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 )
}
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);
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
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();
+ wxList::compatibility_iterator 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();
+ 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))
}
}
- node = node->Next();
+ node = node->GetNext();
}
WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc);
if ( !hDC)
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
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
projects / wxWidgets.git / blobdiff