本文整理汇总了C++中wxBitmap::HasAlpha方法的典型用法代码示例。如果您正苦于以下问题：C++ wxBitmap::HasAlpha方法的具体用法？C++ wxBitmap::HasAlpha怎么用？C++ wxBitmap::HasAlpha使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类wxBitmap的用法示例。
在下文中一共展示了wxBitmap::HasAlpha方法的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Add
// Adds a bitmap, and optionally a mask bitmap.
// Note that wxImageList creates new bitmaps, so you may delete
// 'bitmap' and 'mask'.
int wxImageList::Add(const wxBitmap& bitmap, const wxBitmap& mask)
{
HBITMAP hbmp;
#if wxUSE_WXDIB && wxUSE_IMAGE
// wxBitmap normally stores alpha in pre-multiplied format but
// ImageList_Draw() does pre-multiplication internally so we need to undo
// the pre-multiplication here. Converting back and forth like this is, of
// course, very inefficient but it's better than wrong appearance so we do
// this for now until a better way can be found.
AutoHBITMAP hbmpRelease;
if ( bitmap.HasAlpha() )
{
hbmp = wxDIB(bitmap.ConvertToImage(),
wxDIB::PixelFormat_NotPreMultiplied).Detach();
hbmpRelease.Init(hbmp);
}
else
#endif // wxUSE_WXDIB && wxUSE_IMAGE
hbmp = GetHbitmapOf(bitmap);
// Use mask only if we don't have alpha, the bitmap isn't drawn correctly
// if we use both.
AutoHBITMAP hbmpMask;
if ( !bitmap.HasAlpha() )
hbmpMask.Init(GetMaskForImage(bitmap, mask));
int index = ImageList_Add(GetHImageList(), hbmp, hbmpMask);
if ( index == -1 )
{
wxLogError(_("Couldn't add an image to the image list."));
}
return index;
}示例2: Replace
// Replaces a bitmap, optionally passing a mask bitmap.
// Note that wxImageList creates new bitmaps, so you may delete
// 'bitmap' and 'mask'.
bool wxImageList::Replace(int index,
const wxBitmap& bitmap,
const wxBitmap& mask)
{
HBITMAP hbmp;
#if wxUSE_WXDIB && wxUSE_IMAGE
// See the comment in Add() above.
AutoHBITMAP hbmpRelease;
if ( bitmap.HasAlpha() )
{
hbmp = wxDIB(bitmap.ConvertToImage(),
wxDIB::PixelFormat_NotPreMultiplied).Detach();
hbmpRelease.Init(hbmp);
}
else
#endif // wxUSE_WXDIB && wxUSE_IMAGE
hbmp = GetHbitmapOf(bitmap);
AutoHBITMAP hbmpMask(GetMaskForImage(bitmap, mask));
if ( !ImageList_Replace(GetHImageList(), index, hbmp, hbmpMask) )
{
wxLogLastError(wxT("ImageList_Replace()"));
return false;
}
return true;
}示例3: Create
bool wxDIB::Create(const wxBitmap& bmp)
{
wxCHECK_MSG( bmp.Ok(), false, wxT("wxDIB::Create(): invalid bitmap") );
if ( !Create(GetHbitmapOf(bmp)) )
return false;
m_hasAlpha = bmp.HasAlpha();
return true;
}示例4: Add
// Adds a bitmap, and optionally a mask bitmap.
// Note that wxImageList creates new bitmaps, so you may delete
// 'bitmap' and 'mask'.
int wxImageList::Add(const wxBitmap& bitmap, const wxBitmap& mask)
{
HBITMAP hbmp;
bool useMask;
#if wxUSE_WXDIB && wxUSE_IMAGE
// wxBitmap normally stores alpha in pre-multiplied format but
// ImageList_Draw() does pre-multiplication internally so we need to undo
// the pre-multiplication here. Converting back and forth like this is, of
// course, very inefficient but it's better than wrong appearance so we do
// this for now until a better way can be found.
AutoHBITMAP hbmpRelease;
if ( bitmap.HasAlpha() )
{
wxImage img = bitmap.ConvertToImage();
// For comctl32.dll < 6 remove alpha channel from image
// to prevent possible interferences with the mask.
if ( wxApp::GetComCtl32Version() < 600 )
{
img.ClearAlpha();
useMask = true;
}
else
{
useMask = false;
}
hbmp = wxDIB(img, wxDIB::PixelFormat_NotPreMultiplied).Detach();
hbmpRelease.Init(hbmp);
}
else
#endif // wxUSE_WXDIB && wxUSE_IMAGE
{
hbmp = GetHbitmapOf(bitmap);
useMask = true;
}
// Use mask only if we don't have alpha, the bitmap isn't drawn correctly
// if we use both.
AutoHBITMAP hbmpMask;
if ( useMask )
hbmpMask.Init(GetMaskForImage(bitmap, mask));
int index = ImageList_Add(GetHImageList(), hbmp, hbmpMask);
if ( index == -1 )
{
wxLogError(_("Couldn't add an image to the image list."));
}
return index;
}示例5: Replace
// Replaces a bitmap, optionally passing a mask bitmap.
// Note that wxImageList creates new bitmaps, so you may delete
// 'bitmap' and 'mask'.
bool wxImageList::Replace(int index,
const wxBitmap& bitmap,
const wxBitmap& mask)
{
HBITMAP hbmp;
bool useMask;
#if wxUSE_WXDIB && wxUSE_IMAGE
// See the comment in Add() above.
AutoHBITMAP hbmpRelease;
if ( bitmap.HasAlpha() )
{
wxImage img = bitmap.ConvertToImage();
if ( wxApp::GetComCtl32Version() < 600 )
{
img.ClearAlpha();
useMask = true;
}
else
{
useMask = false;
}
hbmp = wxDIB(img, wxDIB::PixelFormat_NotPreMultiplied).Detach();
hbmpRelease.Init(hbmp);
}
else
#endif // wxUSE_WXDIB && wxUSE_IMAGE
{
hbmp = GetHbitmapOf(bitmap);
useMask = true;
}
AutoHBITMAP hbmpMask;
if ( useMask )
hbmpMask.Init(GetMaskForImage(bitmap, mask));
if ( !ImageList_Replace(GetHImageList(), index, hbmp, hbmpMask) )
{
wxLogLastError(wxT("ImageList_Replace()"));
return false;
}
return true;
}示例6: DoPreviewBitmap
void wxGenericColourDialog::DoPreviewBitmap(wxBitmap& bmp, const wxColour& colour)
{
if ( bmp.HasAlpha() && colour.Alpha() != wxALPHA_OPAQUE )
{
// For real ARGB draw a chessboard grid
// with actual ARGB fields and reference RGB fields.
const int w = bmp.GetWidth();
const int h = bmp.GetHeight();
// Calculate field size: 4 fields per row/column,
// with size in range [2..10]
int dx = wxMax(wxMin(w / 4, 10), 2);
int dy = wxMax(wxMin(h / 4, 10), 2);
// We want a square field
dx = wxMax(dx, dy);
dy = dx;
// Prepare opaque colour
wxColour colourRGB(colour.Red(), colour.Green(), colour.Blue(), wxALPHA_OPAQUE);
{
wxBrush brushARGB(colour);
wxBrush brushRGB(colourRGB);
wxMemoryDC mdc(bmp);
{
wxGCDC gdc(mdc);
gdc.SetPen(*wxTRANSPARENT_PEN);
for (int x = 0, ix = 0; x < w; x += dx, ix++)
{
for (int y = 0, iy = 0; y < h; y += dy, iy++)
{
if ( (ix+iy) % 2 == 0 )
{
gdc.SetBrush(brushARGB);
}
else
{
gdc.SetBrush(brushRGB);
}
gdc.DrawRectangle(x, y, dx, dy);
}
}
// Draw a frame
gdc.SetPen(*wxBLACK_PEN);
gdc.SetBrush(*wxTRANSPARENT_BRUSH);
gdc.DrawRectangle(0, 0, w, h);
}
}
}
else
{
wxMemoryDC mdc(bmp);
// Fill with custom colour
wxBrush brush(colour);
mdc.SetPen(*wxBLACK_PEN);
mdc.SetBrush(brush);
mdc.DrawRectangle(wxPoint(0, 0), bmp.GetSize());
}
}