add Colour::parse{Hex,HexAlpha,HexShort} (813201cb) · Commits · github_fork / Clip

src/signaltk/core/colour.cc

+57 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,8 @@
		* copy of the GNU General Public License along with this program. If not, see
		* <http://www.gnu.org/licenses/>.
		*/
		#include <string.h>
		#include <signaltk/util/stringutil.h>
		#include "colour.h"

		namespace signaltk {
		@@ -19,6 +21,10 @@ Colour Colour::fromRGB(double red, double green, double blue) {
		return Colour({ red, green, blue, 1.0 });
		}

		Colour::Colour() {
		memset(components_, 0, sizeof(components_));
		}

		Colour::Colour(
		const std::initializer_list<double>& components) {
		assert(components.size() <= kMaxComponents);
		@@ -57,5 +63,56 @@ double& Colour::operator[](size_t idx) {
		return components_[idx];
		}

		bool Colour::parse(const std::string& str) {
		if (StringUtil::beginsWith(str, "#")) {
		switch (str.size()) {
		case 4:
		return parseHexShort(str);
		case 7:
		return parseHex(str);
		case 9:
		return parseHexAlpha(str);
		}
		}

		return false;
		}

		bool Colour::parseHex(const std::string& str) {
		if (str.size() != 7) {
		return false;
		}

		components_[0] = std::stoi(str.substr(1, 2), nullptr, 16) / 255.0f;
		components_[1] = std::stoi(str.substr(3, 2), nullptr, 16) / 255.0f;
		components_[2] = std::stoi(str.substr(5, 2), nullptr, 16) / 255.0f;
		components_[3] = 1.0f;
		return true;
		}

		bool Colour::parseHexAlpha(const std::string& str) {
		if (str.size() != 9) {
		return false;
		}

		components_[0] = std::stoi(str.substr(1, 2), nullptr, 16) / 255.0f;
		components_[1] = std::stoi(str.substr(3, 2), nullptr, 16) / 255.0f;
		components_[2] = std::stoi(str.substr(5, 2), nullptr, 16) / 255.0f;
		components_[3] = std::stoi(str.substr(7, 2), nullptr, 16) / 255.0f;
		return true;
		}

		bool Colour::parseHexShort(const std::string& str) {
		if (str.size() != 4) {
		return false;
		}

		components_[0] = std::stoi(str.substr(1, 1), nullptr, 16) / 16.0f;
		components_[1] = std::stoi(str.substr(2, 1), nullptr, 16) / 16.0f;
		components_[2] = std::stoi(str.substr(3, 1), nullptr, 16) / 16.0f;
		components_[3] = 1.0f;
		return true;
		}

		} // namespace signaltk

src/signaltk/core/colour.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@
		#include <stdlib.h>
		#include <stdint.h>
		#include <vector>
		#include <string>

		namespace signaltk {

		@@ -22,6 +23,7 @@ public:
		static Colour fromRGB(double red, double green, double blue);
		static Colour fromRGBA(double red, double green, double blue, double alpha);

		Colour();
		Colour(const std::initializer_list<double>& components);

		double red() const;
		@@ -33,6 +35,11 @@ public:
		double operator[](size_t idx) const;
		double& operator[](size_t idx);

		bool parse(const std::string& str);
		bool parseHex(const std::string& str);
		bool parseHexAlpha(const std::string& str);
		bool parseHexShort(const std::string& str);

		protected:
		double components_[kMaxComponents];
		};

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