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, 29 insertions, 0 deletions

diff --git a/source/blender/compositor/operations/COM_AlphaOverPremultiplyOperation.cc b/source/blender/compositor/operations/COM_AlphaOverPremultiplyOperation.cc
index 3dd4607e273..a57e8c7f8a3 100644
--- a/source/blender/compositor/operations/COM_AlphaOverPremultiplyOperation.cc
+++ b/source/blender/compositor/operations/COM_AlphaOverPremultiplyOperation.cc
@@ -20,6 +20,11 @@
 
 namespace blender::compositor {
 
+AlphaOverPremultiplyOperation::AlphaOverPremultiplyOperation()
+{
+  this->flags.can_be_constant = true;
+}
+
 void AlphaOverPremultiplyOperation::executePixelSampled(float output[4],
                                                         float x,
                                                         float y,
@@ -50,4 +55,28 @@ void AlphaOverPremultiplyOperation::executePixelSampled(float output[4],
   }
 }
 
+void AlphaOverPremultiplyOperation::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 mul = 1.0f - value * over_color[3];
+
+      p.out[0] = (mul * color1[0]) + value * over_color[0];
+      p.out[1] = (mul * color1[1]) + value * over_color[1];
+      p.out[2] = (mul * color1[2]) + value * over_color[2];
+      p.out[3] = (mul * color1[3]) + value * over_color[3];
+    }
+  }
+}
+
 }  // namespace blender::compositor