// 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"
+
+#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
+#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)
// ---------------------------------------------------------------------------
// 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
// ---------------------------------------------------------------------------
// 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
// ----------------------------------------------------------------------------
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)
+ {
+ m_modeOld = ::SetStretchBltMode(m_hdc, mode);
+ if ( !m_modeOld )
+ wxLogLastError(_T("SetStretchBltMode"));
+ }
+
+ ~StretchBltModeChanger()
+ {
+ if ( !::SetStretchBltMode(m_hdc, m_modeOld) )
+ wxLogLastError(_T("SetStretchBltMode"));
+ }
+
+private:
+ const HDC m_hdc;
+
+ int m_modeOld;
+};
+
// ===========================================================================
// implementation
// ===========================================================================
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);
m_oldPen = 0;
m_oldBrush = 0;
m_oldFont = 0;
+#if wxUSE_PALETTE
m_oldPalette = 0;
+#endif // wxUSE_PALETTE
m_bOwnsDC = FALSE;
m_hDC = 0;
-
- m_windowExtX = VIEWPORT_EXTENT;
- m_windowExtY = VIEWPORT_EXTENT;
}
-
wxDC::~wxDC()
{
if ( m_hDC != 0 )
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)
::SelectObject((HDC) dc, (HFONT) m_oldFont);
}
m_oldFont = 0;
+
+#if wxUSE_PALETTE
if (m_oldPalette)
{
- ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
+ ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, FALSE);
}
m_oldPalette = 0;
+#endif // wxUSE_PALETTE
}
m_brush = wxNullBrush;
m_pen = wxNullPen;
+#if wxUSE_PALETTE
m_palette = wxNullPalette;
+#endif // wxUSE_PALETTE
m_font = wxNullFont;
m_backgroundBrush = wxNullBrush;
m_selectedBitmap = wxNullBitmap;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
RECT rect;
- GetClipBox(GetHdc(), &rect);
+ ::GetClipBox(GetHdc(), &rect);
m_clipX1 = (wxCoord) XDEV2LOG(rect.left);
m_clipY1 = (wxCoord) YDEV2LOG(rect.top);
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)
+#ifdef __WIN16__
+ 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
//
}
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()
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
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;
#ifdef __WXMICROWIN__
if (!GetHDC()) return 16;
#endif
-
+
return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
}
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
RECT rect;
if ( m_canvas )
{
(void) ::SetMapMode(GetHdc(), MM_TEXT);
- 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;
::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);
}
-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 __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;
}
bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
#ifdef __WXMICROWIN__
if (!GetHDC()) return FALSE;
#endif
-
+
wxCHECK_MSG( col, FALSE, _T("NULL colour parameter in wxDC::GetPixel") );
// get the color of the pixel
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxCoord x1 = x-VIEWPORT_EXTENT;
wxCoord y1 = y-VIEWPORT_EXTENT;
wxCoord x2 = x+VIEWPORT_EXTENT;
#ifdef __WXMICROWIN__
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));
-
CalcBoundingBox(x1, y1);
CalcBoundingBox(x2, y2);
}
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
double dx = xc - x1;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
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;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
COLORREF color = 0x00ffffff;
if (m_pen.Ok())
{
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
// Do things less efficiently if we have offsets
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// Do things less efficiently if we have offsets
if (xoffset != 0 || yoffset != 0)
{
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
wxCoord x2 = x + width;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
// Now, a negative radius value is interpreted to mean
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
wxCoord x2 = (x+width);
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
wxCoord x2 = x + w;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
#ifdef __WIN32__
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
int width = bmp.GetWidth(),
HBITMAP hbmpMask = 0;
+#if wxUSE_PALETTE
+ 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();
useMask = FALSE;
}
}
-
if ( useMask )
{
#ifdef __WIN32__
if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
#endif
{
+ 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);
+ ::RealizePalette(hdcMem);
+ }
+#endif // wxUSE_PALETTE
- ok = ::MaskBlt(GetHdc(), x, y, width, height,
+ ok = ::MaskBlt(cdc, x, y, width, height,
hdcMem, 0, 0,
hbmpMask, 0, 0,
MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
+
+#if wxUSE_PALETTE
+ if (oldPal)
+ ::SelectPalette(hdcMem, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
+ ::SelectObject(hdcMem, hOldBitmap);
::DeleteDC(hdcMem);
}
::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
}
- ::SelectObject( memdc, hbitmap );
+#if wxUSE_PALETTE
+ wxPalette *pal = bmp.GetPalette();
+ if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
+ {
+ oldPal = ::SelectPalette(memdc, GetHpaletteOf(*pal), FALSE);
+ ::RealizePalette(memdc);
+ }
+#endif // wxUSE_PALETTE
+
+ HGDIOBJ hOldBitmap = ::SelectObject( memdc, hbitmap );
::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
+
+#if wxUSE_PALETTE
+ if (oldPal)
+ ::SelectPalette(memdc, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
+ ::SelectObject( memdc, hOldBitmap );
::DeleteDC( memdc );
::SetTextColor(GetHdc(), old_textground);
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
DrawAnyText(text, x, y);
// update the bounding box
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// prepare for drawing the text
if ( m_textForegroundColour.Ok() )
SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// we test that we have some font because otherwise we should still use the
// "else" part below to avoid that DrawRotatedText(angle = 180) and
// DrawRotatedText(angle = 0) use different fonts (we can't use the default
// "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
}
// set GDI objects
// ---------------------------------------------------------------------------
-void wxDC::SetPalette(const wxPalette& palette)
+#if wxUSE_PALETTE
+
+void wxDC::DoSelectPalette(bool realize)
{
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldPalette)
{
- ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
+ ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE);
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, TRUE);
- m_oldPalette = 0;
- }
+ HPALETTE oldPal = ::SelectPalette(GetHdc(),
+ GetHpaletteOf(m_palette),
+ FALSE);
+ if (!m_oldPalette)
+ m_oldPalette = (WXHPALETTE) oldPal;
- return;
+ if (realize)
+ ::RealizePalette(GetHdc());
}
+}
- if (m_palette.Ok() && m_palette.GetHPALETTE())
+void wxDC::SetPalette(const wxPalette& palette)
+{
+ if ( palette.Ok() )
{
- HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
- if (!m_oldPalette)
- m_oldPalette = (WXHPALETTE) oldPal;
+ m_palette = palette;
+ DoSelectPalette(TRUE);
+ }
+}
+
+void wxDC::InitializePalette()
+{
+ if ( wxDisplayDepth() <= 8 )
+ {
+ // 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();
+ }
}
}
+#endif // wxUSE_PALETTE
+
void wxDC::SetFont(const wxFont& the_font)
{
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldFont)
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldPen)
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
// Set the old object temporarily, in case the assignment deletes an object
// that's not yet selected out.
if (m_oldBrush)
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
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
m_backgroundBrush = brush;
if (!m_backgroundBrush.Ok())
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
m_backgroundMode = 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)
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
m_logicalFunction = function;
SetRop(m_hDC);
#ifdef __WXMICROWIN__
if (!GetHDC()) return 0;
#endif
-
+
TEXTMETRIC lpTextMetric;
GetTextMetrics(GetHdc(), &lpTextMetric);
- return YDEV2LOGREL(lpTextMetric.tmHeight);
+ return lpTextMetric.tmHeight;
}
wxCoord wxDC::GetCharWidth() const
#ifdef __WXMICROWIN__
if (!GetHDC()) return 0;
#endif
-
+
TEXTMETRIC lpTextMetric;
GetTextMetrics(GetHdc(), &lpTextMetric);
- return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
+ return lpTextMetric.tmAveCharWidth;
}
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 )
{
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 )
{
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
- 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);
+ m_mappingMode = mode;
- 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!)
+ ::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);
}
void wxDC::SetUserScale(double x, double y)
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
+ if ( x == m_userScaleX && y == m_userScaleY )
+ return;
+
m_userScaleX = x;
m_userScaleY = y;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
- m_signX = xLeftRight ? 1 : -1;
- m_signY = yBottomUp ? -1 : 1;
- SetMapMode(m_mappingMode);
+ int signX = xLeftRight ? 1 : -1,
+ signY = yBottomUp ? -1 : 1;
+
+ if ( signX != m_signX || signY != m_signY )
+ {
+ m_signX = signX;
+ m_signY = signY;
+
+ SetMapMode(m_mappingMode);
+ }
}
void wxDC::SetSystemScale(double x, double y)
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
+ if ( x == m_scaleX && y == m_scaleY )
+ return;
+
m_scaleX = x;
m_scaleY = y;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
+ if ( x == m_logicalOriginX && y == m_logicalOriginY )
+ return;
+
m_logicalOriginX = x;
m_logicalOriginY = y;
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
+ if ( x == m_deviceOriginX && y == m_deviceOriginY )
+ return;
+
m_deviceOriginX = x;
m_deviceOriginY = 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);
}
// ---------------------------------------------------------------------------
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 )
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,
}
// 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
{
}
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()
+ 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;
+ }
}
}
+
::SetTextColor(GetHdc(), old_textground);
::SetBkColor(GetHdc(), old_background);
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
}
#ifdef __WXMICROWIN__
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
#ifdef __WXMICROWIN__
if (!GetHDC()) return wxSize();
#endif
-
+
int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
#ifdef __WXMICROWIN__
if (!GetHDC()) return;
#endif
-
+
m_logicalScaleX = x;
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)
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);
+ sm_bitmapCache.DeleteContents(TRUE);
+ sm_bitmapCache.Clear();
+ sm_bitmapCache.DeleteContents(FALSE);
}
// 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?
+#ifdef AC_SRC_OVER
+ // 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