/**
* Utility method, creates the preview image bitmap and modifies the palette to
* be a grayscale palette.
* @param size Size of the image.
* @param pixels The pixels.
*/
Gdiplus::Bitmap* PreviewControl::createPreview( const FitsLiberator::Size& size, Byte* pixels ) {
Bitmap* previewImage = new Bitmap( size.width, size.height, size.width, PixelFormat8bppIndexed, pixels );
UInt paletteSize = previewImage->GetPaletteSize();
if( paletteSize > 0 ) {
ColorPalette* palette = (ColorPalette*)malloc( paletteSize );
previewImage->GetPalette( palette, paletteSize );
for( UInt i = 0; i < palette->Count; i++ ) {
palette->Entries[i] = Gdiplus::Color::MakeARGB( 0xFF, (Byte)i, (Byte)i, (Byte)i );
}
previewImage->SetPalette( palette );
free( palette );
}
return previewImage;
}
/**
* Utiliy method, creates a mask bitmap and modifes the palette accordingly.
* @param size Size of the mask.
* @param color Color of the mask.
* @param pixels The pixels.
*/
Gdiplus::Bitmap* PreviewControl::createMask( const FitsLiberator::Size& size, const Gdiplus::Color& color, Byte* pixels ) {
Bitmap* mask = new Bitmap( size.width, size.height, size.width, PixelFormat8bppIndexed, pixels );
UInt paletteSize = mask->GetPaletteSize();
if( paletteSize > 0 ) {
ColorPalette* palette = (ColorPalette*)malloc( paletteSize );
mask->GetPalette( palette, paletteSize );
if( palette->Count >= 256 ) {
palette->Entries[255] = 0; // Transparent black
palette->Entries[0] = Gdiplus::Color::MakeARGB( 0xFF, color.GetR(), color.GetG(), color.GetB() );
}
mask->SetPalette( palette );
free( palette );
}
return mask;
}