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Blend transparent images with background color in PDF plotter.

This commit is contained in:
Alex Shvartzkop 2023-07-02 03:31:37 +03:00
parent 7b5e725b98
commit 0d7b4bbb09
1 changed files with 9 additions and 5 deletions
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14
common/plotters/PDF_plotter.cpp
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@ -498,6 +498,10 @@ void PDF_PLOTTER::PlotImage( const wxImage& aImage, const VECTOR2I& aPos, double
" /H %d\n"
"ID\n", m_colorMode ? "/RGB" : "/G", pix_size.x, pix_size.y );
wxColor bg = m_renderSettings->GetBackgroundColor() != COLOR4D::UNSPECIFIED
? m_renderSettings->GetBackgroundColor().ToColour()
: wxColor( 255, 255, 255 );
/* Here comes the stream (in binary!). I *could* have hex or ascii84
encoded it, but who cares? I'll go through zlib anyway */
for( int y = 0; y < pix_size.y; y++ )
@ -508,7 +512,7 @@ void PDF_PLOTTER::PlotImage( const wxImage& aImage, const VECTOR2I& aPos, double
unsigned char g = aImage.GetGreen( x, y ) & 0xFF;
unsigned char b = aImage.GetBlue( x, y ) & 0xFF;
// PDF inline images don't support alpha, so premultiply against white background
// PDF inline images don't support alpha, so blend with background color
if( aImage.HasAlpha() )
{
unsigned char alpha = aImage.GetAlpha( x, y ) & 0xFF;
@ -516,10 +520,10 @@ void PDF_PLOTTER::PlotImage( const wxImage& aImage, const VECTOR2I& aPos, double
if( alpha < 0xFF )
{
float d = alpha / 255.0;
float a = 1.0 - d;
r = std::min( KiROUND( r * d + ( a * 0xFF ) ), 0xFF );
g = std::min( KiROUND( g * d + ( a * 0xFF ) ), 0xFF );
b = std::min( KiROUND( b * d + ( a * 0xFF ) ), 0xFF );
r = wxColour::AlphaBlend( r, bg.Red(), d );
g = wxColour::AlphaBlend( g, bg.Green(), d );
b = wxColour::AlphaBlend( b, bg.Blue(), d );
}
}