clamp & round alpha (3b52c03f) · Commits · e / os / android_frameworks_base

libs/hwui/RenderProperties.h

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -209,7 +209,7 @@ public:
	}		}

	bool setAlpha(float alpha) {		bool setAlpha(float alpha) {
	alpha = fminf(1.0f, fmaxf(0.0f, alpha));		alpha = MathUtils::clampAlpha(alpha);
	return RP_SET(mPrimitiveFields.mAlpha, alpha);		return RP_SET(mPrimitiveFields.mAlpha, alpha);
	}		}

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -20,6 +20,7 @@ namespace android {
	namespace uirenderer {		namespace uirenderer {

	#define NON_ZERO_EPSILON (0.001f)		#define NON_ZERO_EPSILON (0.001f)
			#define ALPHA_EPSILON (0.001f)

	class MathUtils {		class MathUtils {
	public:		public:
	@@ -34,6 +35,16 @@ public:
	return value >= NON_ZERO_EPSILON;		return value >= NON_ZERO_EPSILON;
	}		}

			inline static float clampAlpha(float alpha) {
			if (alpha <= ALPHA_EPSILON) {
			return 0;
			} else if (alpha >= (1 - ALPHA_EPSILON)) {
			return 1;
			} else {
			return alpha;
			}
			}

	inline static bool areEqual(float valueA, float valueB) {		inline static bool areEqual(float valueA, float valueB) {
	return isZero(valueA - valueB);		return isZero(valueA - valueB);
	}		}