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simplify color calculation.

This commit is contained in:
jean-pierre charras 2017-02-23 17:05:28 +01:00
parent 3bf0b9534c
commit 2f24b31b28
1 changed files with 5 additions and 45 deletions
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50
common/gal/color4d.cpp
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@ -76,53 +76,13 @@ COLOR4D::COLOR4D( EDA_COLOR_T aColor )
COLOR4D COLOR4D::LegacyMix( COLOR4D aColor ) const
{
/* Memoization storage. This could be potentially called for each
* color merge so a cache is useful (there are few colours anyway) */
static std::map< std::pair< uint32_t, uint32_t >, uint32_t > mix_cache;
// First easy thing: a black gives always the other colour
if( *this == COLOR4D::BLACK )
return aColor;
if( aColor == COLOR4D::BLACK )
return *this;
uint32_t myPackedColor = ToU32();
uint32_t aPackedColor = aColor.ToU32();
/* Now we are sure that black can't occur, so the rule is:
* BLACK means not computed yet. If we're lucky we already have
* an answer */
auto search = mix_cache.find( std::pair< uint32_t, uint32_t >( myPackedColor,
aPackedColor ) );
COLOR4D candidate = COLOR4D::BLACK;
if( search != mix_cache.end() )
candidate.FromU32( search->second );
if( candidate != COLOR4D::BLACK )
return candidate;
COLOR4D candidate;
// Blend the two colors (i.e. OR the RGB values)
COLOR4D mixed( ( (uint8_t)( 255.0 * this->r ) | (uint8_t)( 255.0 * aColor.r ) ) / 255.0,
( (uint8_t)( 255.0 * this->g ) | (uint8_t)( 255.0 * aColor.g ) ) / 255.0,
( (uint8_t)( 255.0 * this->b ) | (uint8_t)( 255.0 * aColor.b ) ) / 255.0,
1.0 );
candidate = mixed;
/* Here, BLACK is *not* a good answer, since it would recompute the next time.
* Even theorically its not possible (with the current rules), but
* maybe the metric will change in the future */
if( candidate == COLOR4D::BLACK )
candidate = COLOR4D( DARKDARKGRAY );
// Store the result in the cache. The operation is commutative, too
mix_cache.insert( std::pair< std::pair< uint32_t, uint32_t >, uint32_t >
( std::pair< uint32_t, uint32_t >( myPackedColor, aPackedColor ),
candidate.ToU32() ) );
mix_cache.insert( std::pair< std::pair< uint32_t, uint32_t >, uint32_t >
( std::pair< uint32_t, uint32_t >( aPackedColor, myPackedColor ),
candidate.ToU32() ) );
candidate.r = ( (unsigned)( 255.0 * r ) | (unsigned)( 255.0 * aColor.r ) ) / 255.0,
candidate.g = ( (unsigned)( 255.0 * g ) | (unsigned)( 255.0 * aColor.g ) ) / 255.0,
candidate.b = ( (unsigned)( 255.0 * b ) | (unsigned)( 255.0 * aColor.b ) ) / 255.0,
candidate.a = 1.0;
return candidate;
}