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Show use use of both wxNativePixelData and wxAlphaPixelData

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40761 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn
2006-08-23 01:17:02 +00:00
parent 0ae3bace9b
commit 8ef089485c
1 changed files with 54 additions and 15 deletions
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69
samples/image/image.cpp
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@@ -302,28 +302,31 @@ public:
MyRawBitmapFrame(wxFrame *parent)
: wxFrame(parent, wxID_ANY, _T("Raw bitmaps (how exciting)")),
m_bitmap(SIZE, SIZE, 32)
m_bitmap(SIZE, SIZE, 24),
m_alphaBitmap(SIZE, SIZE, 32)
{
SetClientSize(SIZE, SIZE);
SetClientSize(SIZE, SIZE*2+25);
// another possibility: wxNativePixelData (don't forget to remove code
// setting alpha in the loop below then)
typedef wxAlphaPixelData Data;
// typedef wxNativePixelData Data;
InitAlphaBitmap();
InitBitmap();
}
void InitAlphaBitmap()
{
// First, clear the whole bitmap by making it alpha
{
Data data( m_bitmap, wxPoint(0,0), wxSize(SIZE, SIZE) );
wxAlphaPixelData data( m_alphaBitmap, 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);
wxAlphaPixelData::Iterator p(data);
for ( int y = 0; y < SIZE; ++y )
{
Data::Iterator rowStart = p;
wxAlphaPixelData::Iterator rowStart = p;
for ( int x = 0; x < SIZE; ++x )
{
p.Alpha() = 0;
@@ -335,7 +338,8 @@ public:
}
// Then, draw colourful alpha-blended stripes
Data data(m_bitmap, wxPoint(BORDER, BORDER) , wxSize(REAL_SIZE, REAL_SIZE));
wxAlphaPixelData data(m_alphaBitmap, wxPoint(BORDER, BORDER),
wxSize(REAL_SIZE, REAL_SIZE));
if ( !data )
{
wxLogError(_T("Failed to gain raw access to bitmap data"));
@@ -343,12 +347,11 @@ public:
}
data.UseAlpha();
Data::Iterator p(data);
wxAlphaPixelData::Iterator p(data);
for ( int y = 0; y < REAL_SIZE; ++y )
{
Data::Iterator rowStart = p;
wxAlphaPixelData::Iterator rowStart = p;
int r = y < REAL_SIZE/3 ? 255 : 0,
g = (REAL_SIZE/3 <= y) && (y < 2*(REAL_SIZE/3)) ? 255 : 0,
@@ -357,7 +360,7 @@ public:
for ( int x = 0; x < REAL_SIZE; ++x )
{
// note that RGB must be premultiplied by alpha
unsigned a = (Data::Iterator::ChannelType)((x*255.)/REAL_SIZE);
unsigned a = (wxAlphaPixelData::Iterator::ChannelType)((x*255.)/REAL_SIZE);
p.Red() = r * a / 256;
p.Green() = g * a / 256;
p.Blue() = b * a / 256;
@@ -371,17 +374,53 @@ public:
}
}
void InitBitmap()
{
// draw some colourful stripes without alpha
wxNativePixelData data(m_bitmap);
if ( !data )
{
wxLogError(_T("Failed to gain raw access to bitmap data"));
return;
}
wxNativePixelData::Iterator p(data);
for ( int y = 0; y < SIZE; ++y )
{
wxNativePixelData::Iterator rowStart = p;
int r = y < SIZE/3 ? 255 : 0,
g = (SIZE/3 <= y) && (y < 2*(SIZE/3)) ? 255 : 0,
b = 2*(SIZE/3) <= y ? 255 : 0;
for ( int x = 0; x < SIZE; ++x )
{
p.Red() = r;
p.Green() = g;
p.Blue() = b;
++p; // same as p.OffsetX(1)
}
p = rowStart;
p.OffsetY(data, 1);
}
}
void OnPaint(wxPaintEvent& WXUNUSED(event))
{
wxPaintDC dc( this );
dc.DrawText(_T("This is alpha and raw bitmap test"), 0, BORDER);
dc.DrawText(_T("This is alpha and raw bitmap test"), 0, SIZE/2 - BORDER);
dc.DrawText(_T("This is alpha and raw bitmap test"), 0, SIZE - 2*BORDER);
dc.DrawBitmap( m_bitmap, 0, 0, true /* use mask */ );
dc.DrawBitmap( m_alphaBitmap, 0, 0, true /* use mask */ );
dc.DrawText(_T("Raw bitmap access without alpha"), 0, SIZE+5);
dc.DrawBitmap( m_bitmap, 0, SIZE+5+dc.GetCharHeight());
}
private:
wxBitmap m_bitmap;
wxBitmap m_alphaBitmap;
DECLARE_EVENT_TABLE()
};