Compositor: Full frame color nodes

Adds full frame implementation to "Alpha Over",
"Hue Saturation Value", "Invert", "Tonemap" and "ZCombine" nodes.
The other nodes in "Color" submenu are implemented separately.
No functional changes.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D12092

1 files changed, 27 insertions, 0 deletions

diff --git a/source/blender/compositor/operations/COM_AlphaOverMixedOperation.cc b/source/blender/compositor/operations/COM_AlphaOverMixedOperation.cc
index c68c79d2263..0cc179ea209 100644
--- a/source/blender/compositor/operations/COM_AlphaOverMixedOperation.cc
+++ b/source/blender/compositor/operations/COM_AlphaOverMixedOperation.cc
@@ -23,6 +23,7 @@ namespace blender::compositor {
 AlphaOverMixedOperation::AlphaOverMixedOperation()
 {
   this->m_x = 0.0f;
+  this->flags.can_be_constant = true;
 }
 
 void AlphaOverMixedOperation::executePixelSampled(float output[4],
@@ -56,4 +57,30 @@ void AlphaOverMixedOperation::executePixelSampled(float output[4],
   }
 }
 
+void AlphaOverMixedOperation::update_memory_buffer_row(PixelCursor &p)
+{
+  for (; p.out < p.row_end; p.next()) {
+    const float *color1 = p.color1;
+    const float *over_color = p.color2;
+    const float value = *p.value;
+
+    if (over_color[3] <= 0.0f) {
+      copy_v4_v4(p.out, color1);
+    }
+    else if (value == 1.0f && over_color[3] >= 1.0f) {
+      copy_v4_v4(p.out, over_color);
+    }
+    else {
+      const float addfac = 1.0f - this->m_x + over_color[3] * this->m_x;
+      const float premul = value * addfac;
+      const float mul = 1.0f - value * over_color[3];
+
+      p.out[0] = (mul * color1[0]) + premul * over_color[0];
+      p.out[1] = (mul * color1[1]) + premul * over_color[1];
+      p.out[2] = (mul * color1[2]) + premul * over_color[2];
+      p.out[3] = (mul * color1[3]) + value * over_color[3];
+    }
+  }
+}
+
 }  // namespace blender::compositor