From f84fb12f5d72433780a96c3cc4381399f153cf1a Mon Sep 17 00:00:00 2001
From: Manuel Castilla <manzanillawork@gmail.com>
Date: Tue, 28 Sep 2021 19:33:06 +0200
Subject: Compositor: Add support for canvas compositing

This commit adds functionality for operations that require pixel
translation or resizing on "Full Frame" mode, allowing to adjust
their canvas. It fixes most cropping issues in translate, scale,
rotate and transform nodes by adjusting their canvas to the result,
instead of the input canvas.

Operations output buffer is still always on (0,0) position for
easier image algorithm implementation, even when the
canvas is not.

Current limitations (will be addressed on bcon2):
- Displayed translation in Viewer node is limited to 6000px.
- When scaling up the canvas size is limited to the
 scene resolution size x 1.5 . From that point it crops.

If none of these limitations are hit, the Viewer node displays
the full input with any translation.

Differential Revision: https://developer.blender.org/D12466
---
 .../compositor/operations/COM_TranslateOperation.h | 27 +++++++++++++---------
 1 file changed, 16 insertions(+), 11 deletions(-)

(limited to 'source/blender/compositor/operations/COM_TranslateOperation.h')

diff --git a/source/blender/compositor/operations/COM_TranslateOperation.h b/source/blender/compositor/operations/COM_TranslateOperation.h
index ce1965cecef..c5a3d1ffd99 100644
--- a/source/blender/compositor/operations/COM_TranslateOperation.h
+++ b/source/blender/compositor/operations/COM_TranslateOperation.h
@@ -24,6 +24,11 @@
 namespace blender::compositor {
 
 class TranslateOperation : public MultiThreadedOperation {
+ protected:
+  static constexpr int IMAGE_INPUT_INDEX = 0;
+  static constexpr int X_INPUT_INDEX = 1;
+  static constexpr int Y_INPUT_INDEX = 2;
+
  private:
   SocketReader *m_inputOperation;
   SocketReader *m_inputXOperation;
@@ -33,12 +38,14 @@ class TranslateOperation : public MultiThreadedOperation {
   bool m_isDeltaSet;
   float m_factorX;
   float m_factorY;
+
+ protected:
   MemoryBufferExtend x_extend_mode_;
   MemoryBufferExtend y_extend_mode_;
 
  public:
   TranslateOperation();
-  TranslateOperation(DataType data_type);
+  TranslateOperation(DataType data_type, ResizeMode mode = ResizeMode::Center);
   bool determineDependingAreaOfInterest(rcti *input,
                                         ReadBufferOperation *readOperation,
                                         rcti *output) override;
@@ -67,16 +74,8 @@ class TranslateOperation : public MultiThreadedOperation {
         this->m_deltaY = tempDelta[0];
       }
       else {
-        this->m_deltaX = 0;
-        NodeOperation *x_op = getInputOperation(1);
-        if (x_op->get_flags().is_constant_operation) {
-          this->m_deltaX = ((ConstantOperation *)x_op)->get_constant_elem()[0];
-        }
-        this->m_deltaY = 0;
-        NodeOperation *y_op = getInputOperation(2);
-        if (y_op->get_flags().is_constant_operation) {
-          this->m_deltaY = ((ConstantOperation *)y_op)->get_constant_elem()[0];
-        }
+        m_deltaX = get_input_operation(X_INPUT_INDEX)->get_constant_value_default(0.0f);
+        m_deltaY = get_input_operation(Y_INPUT_INDEX)->get_constant_value_default(0.0f);
       }
 
       this->m_isDeltaSet = true;
@@ -93,4 +92,10 @@ class TranslateOperation : public MultiThreadedOperation {
                                     Span<MemoryBuffer *> inputs) override;
 };
 
+class TranslateCanvasOperation : public TranslateOperation {
+ public:
+  TranslateCanvasOperation();
+  void determine_canvas(const rcti &preferred_area, rcti &r_area) override;
+};
+
 }  // namespace blender::compositor
-- 
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