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better mask handling in wxBitmap to wxImage conversion (patch 754881)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21219 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2003-06-18 00:41:37 +00:00
parent 8b389fab25
commit c8688869d9
1 changed files with 28 additions and 9 deletions
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37
src/msw/bitmap.cpp
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@ -827,6 +827,13 @@ bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
wxImage wxBitmap::ConvertToImage() const
{
// the colour used as transparent one in wxImage and the one it is replaced
// with when it really occurs in the bitmap
static const int MASK_RED = 1;
static const int MASK_GREEN = 2;
static const int MASK_BLUE = 3;
static const int MASK_BLUE_REPLACEMENT = 2;
wxImage image;
wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
@ -918,27 +925,39 @@ wxImage wxBitmap::ConvertToImage() const
::SetBkColor( memdc, RGB( 255, 255, 255 ) );
::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
::DeleteDC( memdc );
// background color set to RGB(16,16,16) in consistent with wxGTK
unsigned char r=16, g=16, b=16;
// background color set to mask colour
unsigned char r=MASK_RED, g=MASK_GREEN, b=MASK_BLUE;
ptdata = data;
ptbits = lpBits;
for( i=0; i<height; i++ )
{
for( j=0; j<width; j++ )
{
if( *ptbits != 0 )
ptdata += 3;
else
// is this pixel transparent?
if ( *ptbits != 0 )
{
*(ptdata++) = r;
*(ptdata++) = g;
*(ptdata++) = b;
if ( (ptdata[0] == MASK_RED) &&
(ptdata[1] == MASK_GREEN) &&
(ptdata[2] == MASK_BLUE) )
{
// we have to fudge the colour a bit to prevent this
// pixel from appearing transparent
ptdata[2] = MASK_BLUE_REPLACEMENT;
}
ptdata += 3;
}
else // masked pixel
{
*(ptdata++) = MASK_RED;
*(ptdata++) = MASK_GREEN;
*(ptdata++) = MASK_BLUE;
}
ptbits += 3;
}
ptbits += padding;
}
image.SetMaskColour( r, g, b );
image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
image.SetMask( TRUE );
}
else