diff options
Diffstat (limited to 'libs/hwui/Interpolator.cpp')
-rw-r--r-- | libs/hwui/Interpolator.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/libs/hwui/Interpolator.cpp b/libs/hwui/Interpolator.cpp index 004ddf5..b56648e 100644 --- a/libs/hwui/Interpolator.cpp +++ b/libs/hwui/Interpolator.cpp @@ -13,9 +13,15 @@ * See the License for the specific language governing permissions and * limitations under the License. */ + +#define LOG_TAG "Interpolator" + #include "Interpolator.h" #include <math.h> +#include <cutils/log.h> + +#include "utils/MathUtils.h" namespace android { namespace uirenderer { @@ -28,5 +34,34 @@ float AccelerateDecelerateInterpolator::interpolate(float input) { return (float)(cosf((input + 1) * M_PI) / 2.0f) + 0.5f; } +LUTInterpolator::LUTInterpolator(float* values, size_t size) { + mValues = values; + mSize = size; +} + +LUTInterpolator::~LUTInterpolator() { + delete mValues; + mValues = 0; +} + +float LUTInterpolator::interpolate(float input) { + float lutpos = input * mSize; + if (lutpos >= (mSize - 1)) { + return mValues[mSize - 1]; + } + + float ipart, weight; + weight = modff(lutpos, &ipart); + + int i1 = (int) ipart; + int i2 = MathUtils::min(i1 + 1, mSize - 1); + + float v1 = mValues[i1]; + float v2 = mValues[i2]; + + return MathUtils::lerp(v1, v2, weight); +} + + } /* namespace uirenderer */ } /* namespace android */ |