1 files changed, 131 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc b/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc
new file mode 100644
index 00000000000..bbc4d63305b
--- /dev/null
+++ b/source/blender/compositor/operations/COM_DisplaceSimpleOperation.cc
@@ -0,0 +1,131 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2012, Blender Foundation.
+ */
+
+#include "COM_DisplaceSimpleOperation.h"
+#include "BLI_math.h"
+#include "BLI_utildefines.h"
+
+DisplaceSimpleOperation::DisplaceSimpleOperation()
+{
+  this->addInputSocket(COM_DT_COLOR);
+  this->addInputSocket(COM_DT_VECTOR);
+  this->addInputSocket(COM_DT_VALUE);
+  this->addInputSocket(COM_DT_VALUE);
+  this->addOutputSocket(COM_DT_COLOR);
+
+  this->m_inputColorProgram = nullptr;
+  this->m_inputVectorProgram = nullptr;
+  this->m_inputScaleXProgram = nullptr;
+  this->m_inputScaleYProgram = nullptr;
+}
+
+void DisplaceSimpleOperation::initExecution()
+{
+  this->m_inputColorProgram = this->getInputSocketReader(0);
+  this->m_inputVectorProgram = this->getInputSocketReader(1);
+  this->m_inputScaleXProgram = this->getInputSocketReader(2);
+  this->m_inputScaleYProgram = this->getInputSocketReader(3);
+
+  this->m_width_x4 = this->getWidth() * 4;
+  this->m_height_x4 = this->getHeight() * 4;
+}
+
+/* minimum distance (in pixels) a pixel has to be displaced
+ * in order to take effect */
+// #define DISPLACE_EPSILON    0.01f
+
+void DisplaceSimpleOperation::executePixelSampled(float output[4],
+                                                  float x,
+                                                  float y,
+                                                  PixelSampler sampler)
+{
+  float inVector[4];
+  float inScale[4];
+
+  float p_dx, p_dy; /* main displacement in pixel space */
+  float u, v;
+
+  this->m_inputScaleXProgram->readSampled(inScale, x, y, sampler);
+  float xs = inScale[0];
+  this->m_inputScaleYProgram->readSampled(inScale, x, y, sampler);
+  float ys = inScale[0];
+
+  /* clamp x and y displacement to triple image resolution -
+   * to prevent hangs from huge values mistakenly plugged in eg. z buffers */
+  CLAMP(xs, -this->m_width_x4, this->m_width_x4);
+  CLAMP(ys, -this->m_height_x4, this->m_height_x4);
+
+  this->m_inputVectorProgram->readSampled(inVector, x, y, sampler);
+  p_dx = inVector[0] * xs;
+  p_dy = inVector[1] * ys;
+
+  /* displaced pixel in uv coords, for image sampling */
+  /* clamp nodes to avoid glitches */
+  u = x - p_dx + 0.5f;
+  v = y - p_dy + 0.5f;
+  CLAMP(u, 0.0f, this->getWidth() - 1.0f);
+  CLAMP(v, 0.0f, this->getHeight() - 1.0f);
+
+  this->m_inputColorProgram->readSampled(output, u, v, sampler);
+}
+
+void DisplaceSimpleOperation::deinitExecution()
+{
+  this->m_inputColorProgram = nullptr;
+  this->m_inputVectorProgram = nullptr;
+  this->m_inputScaleXProgram = nullptr;
+  this->m_inputScaleYProgram = nullptr;
+}
+
+bool DisplaceSimpleOperation::determineDependingAreaOfInterest(rcti *input,
+                                                               ReadBufferOperation *readOperation,
+                                                               rcti *output)
+{
+  rcti colorInput;
+  NodeOperation *operation = nullptr;
+
+  /* the vector buffer only needs a 2x2 buffer. The image needs whole buffer */
+  /* image */
+  operation = getInputOperation(0);
+  colorInput.xmax = operation->getWidth();
+  colorInput.xmin = 0;
+  colorInput.ymax = operation->getHeight();
+  colorInput.ymin = 0;
+  if (operation->determineDependingAreaOfInterest(&colorInput, readOperation, output)) {
+    return true;
+  }
+
+  /* vector */
+  if (operation->determineDependingAreaOfInterest(input, readOperation, output)) {
+    return true;
+  }
+
+  /* scale x */
+  operation = getInputOperation(2);
+  if (operation->determineDependingAreaOfInterest(input, readOperation, output)) {
+    return true;
+  }
+
+  /* scale y */
+  operation = getInputOperation(3);
+  if (operation->determineDependingAreaOfInterest(input, readOperation, output)) {
+    return true;
+  }
+
+  return false;
+}