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Use transparency for gradients fdo#45219

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vclcanvas has 1bpp alpha - so cut-off transparency at 98%
This looks for all practical cases close enough to full alpha.
This commit is contained in:
Thorsten Behrens
2012-03-07 00:34:52 +01:00
parent 4b475f31eb
commit 3f5efa1e76
2 changed files with 42 additions and 41 deletions
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45
canvas/source/vcl/canvashelper.cxx
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@@ -155,8 +155,9 @@ namespace vclcanvas
tools::OutDevStateKeeper aStateKeeper( mpProtectedOutDev );
rOutDev.EnableMapMode( sal_False );
rOutDev.SetLineColor( COL_TRANSPARENT );
rOutDev.SetFillColor( COL_TRANSPARENT );
rOutDev.SetLineColor( COL_WHITE );
rOutDev.SetFillColor( COL_WHITE );
rOutDev.SetClipRegion();
rOutDev.DrawRect( Rectangle( Point(),
rOutDev.GetOutputSizePixel()) );
@@ -166,8 +167,9 @@ namespace vclcanvas
rOutDev2.SetDrawMode( DRAWMODE_DEFAULT );
rOutDev2.EnableMapMode( sal_False );
rOutDev2.SetLineColor( COL_TRANSPARENT );
rOutDev2.SetFillColor( COL_TRANSPARENT );
rOutDev2.SetLineColor( COL_WHITE );
rOutDev2.SetFillColor( COL_WHITE );
rOutDev2.SetClipRegion();
rOutDev2.DrawRect( Rectangle( Point(),
rOutDev2.GetOutputSizePixel()) );
rOutDev2.SetDrawMode( DRAWMODE_BLACKLINE | DRAWMODE_BLACKFILL | DRAWMODE_BLACKTEXT |
@@ -500,19 +502,11 @@ namespace vclcanvas
if( mp2ndOutDev )
{
// HACK. Normally, CanvasHelper does not care
// about actually what mp2ndOutDev is...
// well, here we do & assume a 1bpp target.
if( nTransparency > 127 )
{
mp2ndOutDev->getOutDev().SetDrawMode( DRAWMODE_WHITELINE | DRAWMODE_WHITEFILL | DRAWMODE_WHITETEXT |
DRAWMODE_WHITEGRADIENT | DRAWMODE_WHITEBITMAP );
mp2ndOutDev->getOutDev().SetFillColor( COL_WHITE );
mp2ndOutDev->getOutDev().DrawPolyPolygon( aPolyPoly );
mp2ndOutDev->getOutDev().SetDrawMode( DRAWMODE_BLACKLINE | DRAWMODE_BLACKFILL | DRAWMODE_BLACKTEXT |
DRAWMODE_BLACKGRADIENT | DRAWMODE_BLACKBITMAP );
}
else
// HACK. Normally, CanvasHelper does not care about
// actually what mp2ndOutDev is... well, here we do &
// assume a 1bpp target - everything beyond 97%
// transparency is fully transparent
if( nTransparency < 253 )
{
mp2ndOutDev->getOutDev().SetFillColor( COL_BLACK );
mp2ndOutDev->getOutDev().DrawPolyPolygon( aPolyPoly );
@@ -716,8 +710,25 @@ namespace vclcanvas
aBmpEx );
if( mp2ndOutDev )
{
// HACK. Normally, CanvasHelper does not care about
// actually what mp2ndOutDev is... well, here we do &
// assume a 1bpp target - everything beyond 97%
// transparency is fully transparent
if( aBmpEx.IsAlpha() )
{
Bitmap aMask( aBmpEx.GetAlpha().GetBitmap() );
aMask.MakeMono( 253 );
aBmpEx = BitmapEx( aBmpEx.GetBitmap(), aMask );
}
else if( aBmpEx.IsTransparent() )
{
aBmpEx = BitmapEx( aBmpEx.GetBitmap(), aBmpEx.GetMask() );
}
mp2ndOutDev->getOutDev().DrawBitmapEx( ::vcl::unotools::pointFromB2DPoint( aOutputPos ),
aBmpEx );
}
// Returning a cache object is not useful, the XBitmap
// itself serves this purpose