diff options
Diffstat (limited to 'source/blender/compositor/operations/COM_LuminanceMatteOperation.cc')
-rw-r--r-- | source/blender/compositor/operations/COM_LuminanceMatteOperation.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc index 5ca16e40ce3..c642c60b912 100644 --- a/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc +++ b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cc @@ -29,6 +29,7 @@ LuminanceMatteOperation::LuminanceMatteOperation() addOutputSocket(DataType::Value); this->m_inputImageProgram = nullptr; + flags.can_be_constant = true; } void LuminanceMatteOperation::initExecution() @@ -78,4 +79,39 @@ void LuminanceMatteOperation::executePixelSampled(float output[4], output[0] = min_ff(alpha, inColor[3]); } +void LuminanceMatteOperation::update_memory_buffer_partial(MemoryBuffer *output, + const rcti &area, + Span<MemoryBuffer *> inputs) +{ + for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) { + const float *color = it.in(0); + const float luminance = IMB_colormanagement_get_luminance(color); + + /* One line thread-friend algorithm: + * `it.out[0] = MIN2(color[3], MIN2(1.0f, MAX2(0.0f, ((luminance - low) / (high - low))));` + */ + + /* Test range. */ + const float high = m_settings->t1; + const float low = m_settings->t2; + float alpha; + if (luminance > high) { + alpha = 1.0f; + } + else if (luminance < low) { + alpha = 0.0f; + } + else { /* Blend. */ + alpha = (luminance - low) / (high - low); + } + + /* Store matte(alpha) value in [0] to go with + * COM_SetAlphaMultiplyOperation and the Value output. + */ + + /* Don't make something that was more transparent less transparent. */ + it.out[0] = MIN2(alpha, color[3]); + } +} + } // namespace blender::compositor |