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Fix rawbitmap sample to clear bitmap first.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37210 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling 2006-01-29 15:44:21 +00:00
parent 9d7d3b1f9f
commit 6e5551ad85
1 changed files with 26 additions and 1 deletions
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27
samples/image/image.cpp
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@ -304,8 +304,33 @@ public:
// another possibility: wxNativePixelData (don't forget to remove code
// setting alpha in the loop below then)
typedef wxAlphaPixelData Data;
// typedef wxNativePixelData Data;
// First, clear the whole bitmap by making it alpha
{
Data data( m_bitmap, wxPoint(0,0), wxSize(SIZE, SIZE) );
if ( !data )
{
wxLogError(_T("Failed to gain raw access to bitmap data"));
return;
}
data.UseAlpha();
Data::Iterator p(data);
for ( int y = 0; y < SIZE; ++y )
{
Data::Iterator rowStart = p;
for ( int x = 0; x < SIZE; ++x )
{
p.Alpha() = 0;
++p; // same as p.OffsetX(1)
}
p = rowStart;
p.OffsetY(data, 1);
}
}
Data data(m_bitmap, wxPoint(BORDER, BORDER), wxSize(REAL_SIZE, REAL_SIZE));
// Then, draw colourful alpha-blended stripes
Data data(m_bitmap, wxPoint(BORDER, BORDER) , wxSize(REAL_SIZE, REAL_SIZE));
if ( !data )
{
wxLogError(_T("Failed to gain raw access to bitmap data"));