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add argb and rgba literals

This commit is contained in:
Vogel, Rick 2023-03-16 17:37:00 +01:00
parent a4692c493c
commit 5d8c96089e
1 changed files with 69 additions and 35 deletions
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102
src/common/QskRgbValue.h
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@ -238,19 +238,10 @@ namespace QskRgb
namespace QskRgb
{
// Converts a HTML #RRGGBB[AA] color hex string to Qt's RGB 0xAARRGGBB integer
QSK_EXPORT constexpr QRgb fromHexString(
const char* const str, const size_t len ) noexcept
// Converts a HTML #12345678... color hex string to a 0x12345678... integer
QSK_EXPORT constexpr QRgb fromHexString( const char* const str, const size_t len ) noexcept
{
constexpr auto rgb_len = 7;
constexpr auto rgba_len = 9;
if ( len != rgb_len && len != rgba_len )
{
return 0;
}
if ( str[ 0 ] != '#' )
if ( len < 1 || str[ 0 ] != '#' )
{
return 0;
}
@ -337,30 +328,80 @@ namespace QskRgb
}
}
// add default 0xFF for alpha channel
if ( len == rgb_len )
{
rgb |= 0xFF000000;
}
// convert rrggbbaa to aarrggbb
if ( len == rgba_len )
{
rgb = ( 0x000000FF & rgb ) << 24 | ( rgb >> 8 );
}
return rgb;
}
namespace literals
{
namespace qrgb
{
// converts a hex string from '#RRGGBB[AA]' to '0x[AA]RRGGBB' integer
QSK_EXPORT constexpr QRgb operator""_rgba(
const char* const str, const size_t len ) noexcept
{
return fromHexString( str, len );
constexpr auto min = 7;
constexpr auto max = 9;
if ( len != min && len != max )
{
return 0;
}
QSK_EXPORT constexpr QColor operator""_color(
const auto argb = static_cast< int >( fromHexString( str, len ) );
const auto r = ( argb >> ( len == max ? 24 : 16 ) ) & 0xFF;
const auto g = ( argb >> ( len == max ? 16 : 8 ) ) & 0xFF;
const auto b = ( argb >> ( len == max ? 8 : 0 ) ) & 0xFF;
const auto a = ( len == max ? argb & 0xFF : 0xFF );
return qRgba( r, g, b, a );
}
// converts a hex string from '#[AA]RRGGBB' to '0x[AA]RRGGBB' integer
QSK_EXPORT constexpr QRgb operator""_argb(
const char* const str, const size_t len ) noexcept
{
constexpr auto min = 7;
constexpr auto max = 9;
if ( len != min && len != max )
{
return 0;
}
const auto argb = static_cast< int >( fromHexString( str, len ) );
const auto r = ( argb >> 16 ) & 0xFF;
const auto g = ( argb >> 8 ) & 0xFF;
const auto b = ( argb >> 0 ) & 0xFF;
const auto a = ( len == max ? argb >> 24 : 0xFF ) & 0xFF;
return qRgba( r, g, b, a );
}
#define QSK_CHECK_CONSTEXPR_LITERAL
#ifdef QSK_CHECK_CONSTEXPR_LITERAL
static_assert( "#123456"_rgba == 0xFF123456, "not constexpr" );
static_assert( "#123456"_argb == 0xFF123456, "not constexpr" );
static_assert( "#AA112233"_argb == 0xAA112233, "not constexpr" );
static_assert( "#112233AA"_rgba == 0xAA112233, "not constexpr" );
#endif
}
namespace color
{
QSK_EXPORT constexpr QColor operator""_rgba(
const char* const str, const size_t len ) noexcept
{
const auto argb = static_cast< int >( fromHexString( str, len ) );
const auto r = ( argb >> 24 ) & 0xFF;
const auto g = ( argb >> 16 ) & 0xFF;
const auto b = ( argb >> 8 ) & 0xFF;
const auto a = ( argb >> 0 ) & 0xFF;
const auto color = QColor{ r, g, b, a };
return color;
}
QSK_EXPORT constexpr QColor operator""_argb(
const char* const str, const size_t len ) noexcept
{
const auto argb = static_cast< int >( fromHexString( str, len ) );
@ -371,14 +412,7 @@ namespace QskRgb
const auto color = QColor{ r, g, b, a };
return color;
}
#define QSK_CHECK_CONSTEXPR_LITERAL
#ifdef QSK_CHECK_CONSTEXPR_LITERAL
// example for rgb with alpha channel set to 0xFF
static_assert( "#123456"_rgba == 0xFF123456, "not constexpr" );
// example for rgba
static_assert( "#112233AA"_rgba == 0xAA112233, "not constexpr" );
#endif
}
}
}