We've reconsidered previous patch in IRC.

It's more useful to completely ignore alpha for display of straight
colors.

Supporting straight pipeline is possible, but not a topic for bcon4.

5 files changed, 22 insertions, 18 deletions

diff --git a/source/blender/compositor/operations/COM_CompositorOperation.cpp b/source/blender/compositor/operations/COM_CompositorOperation.cpp
index 7cb3a614022..43f491ad2d9 100644
--- a/source/blender/compositor/operations/COM_CompositorOperation.cpp
+++ b/source/blender/compositor/operations/COM_CompositorOperation.cpp
@@ -49,7 +49,7 @@ CompositorOperation::CompositorOperation() : NodeOperation()
 	this->m_alphaInput = NULL;
 	this->m_depthInput = NULL;
 
-	this->m_straightAlpha = false;
+	this->m_ignoreAlpha = false;
 
 	this->m_sceneName[0] = '\0';
 }
@@ -140,12 +140,14 @@ void CompositorOperation::executeRegion(rcti *rect, unsigned int tileNumber)
 	for (y = y1; y < y2 && (!breaked); y++) {
 		for (x = x1; x < x2 && (!breaked); x++) {
 			this->m_imageInput->read(color, x, y, COM_PS_NEAREST);
-			if (this->m_alphaInput != NULL) {
-				this->m_alphaInput->read(&(color[3]), x, y, COM_PS_NEAREST);
+			if (this->m_ignoreAlpha) {
+				color[3] = 1.0f;
+			}
+			else {
+				if (this->m_alphaInput != NULL) {
+					this->m_alphaInput->read(&(color[3]), x, y, COM_PS_NEAREST);
+				}
 			}
-
-			if (this->m_straightAlpha)
-				straight_to_premul_v4(color);
 
 			copy_v4_v4(buffer + offset4, color);
 
diff --git a/source/blender/compositor/operations/COM_CompositorOperation.h b/source/blender/compositor/operations/COM_CompositorOperation.h
index e60862be410..27d29664610 100644
--- a/source/blender/compositor/operations/COM_CompositorOperation.h
+++ b/source/blender/compositor/operations/COM_CompositorOperation.h
@@ -66,8 +66,8 @@ private:
 	 */
 	SocketReader *m_depthInput;
 
-	/* node input has got straight alpha which shall be premultiplied */
-	bool m_straightAlpha;
+	/* Ignore any alpha input */
+	bool m_ignoreAlpha;
 
 public:
 	CompositorOperation();
@@ -79,6 +79,6 @@ public:
 	void deinitExecution();
 	const CompositorPriority getRenderPriority() const { return COM_PRIORITY_MEDIUM; }
 	void determineResolution(unsigned int resolution[2], unsigned int preferredResolution[2]);
-	void setStraightAlpha(bool value) { this->m_straightAlpha = value; }
+	void setIgnoreAlpha(bool value) { this->m_ignoreAlpha = value; }
 };
 #endif
diff --git a/source/blender/compositor/operations/COM_ViewerBaseOperation.cpp b/source/blender/compositor/operations/COM_ViewerBaseOperation.cpp
index 87d7a810d80..072246932db 100644
--- a/source/blender/compositor/operations/COM_ViewerBaseOperation.cpp
+++ b/source/blender/compositor/operations/COM_ViewerBaseOperation.cpp
@@ -48,7 +48,7 @@ ViewerBaseOperation::ViewerBaseOperation() : NodeOperation()
 	this->m_doDepthBuffer = false;
 	this->m_viewSettings = NULL;
 	this->m_displaySettings = NULL;
-	this->m_straightAlpha = false;
+	this->m_ignoreAlpha = false;
 }
 
 void ViewerBaseOperation::initExecution()
diff --git a/source/blender/compositor/operations/COM_ViewerBaseOperation.h b/source/blender/compositor/operations/COM_ViewerBaseOperation.h
index 1f773c5151a..9f7e80ad6fc 100644
--- a/source/blender/compositor/operations/COM_ViewerBaseOperation.h
+++ b/source/blender/compositor/operations/COM_ViewerBaseOperation.h
@@ -39,7 +39,7 @@ protected:
 	OrderOfChunks m_chunkOrder;
 	bool m_doDepthBuffer;
 	ImBuf *m_ibuf;
-	bool m_straightAlpha;
+	bool m_ignoreAlpha;
 
 	const ColorManagedViewSettings *m_viewSettings;
 	const ColorManagedDisplaySettings *m_displaySettings;
@@ -60,7 +60,7 @@ public:
 	OrderOfChunks getChunkOrder() { return this->m_chunkOrder; }
 	const CompositorPriority getRenderPriority() const;
 	bool isViewerOperation() { return true; }
-	void setStraightAlpha(bool value) { this->m_straightAlpha = value; }
+	void setIgnoreAlpha(bool value) { this->m_ignoreAlpha = value; }
 
 	void setViewSettings(const ColorManagedViewSettings *viewSettings) { this->m_viewSettings = viewSettings; }
 	void setDisplaySettings(const ColorManagedDisplaySettings *displaySettings) { this->m_displaySettings = displaySettings; }
diff --git a/source/blender/compositor/operations/COM_ViewerOperation.cpp b/source/blender/compositor/operations/COM_ViewerOperation.cpp
index f1ac893bd3f..4d10e49aeeb 100644
--- a/source/blender/compositor/operations/COM_ViewerOperation.cpp
+++ b/source/blender/compositor/operations/COM_ViewerOperation.cpp
@@ -89,18 +89,20 @@ void ViewerOperation::executeRegion(rcti *rect, unsigned int tileNumber)
 	for (y = y1; y < y2 && (!breaked); y++) {
 		for (x = x1; x < x2; x++) {
 			this->m_imageInput->read(&(buffer[offset4]), x, y, COM_PS_NEAREST);
-			if (this->m_alphaInput != NULL) {
-				this->m_alphaInput->read(alpha, x, y, COM_PS_NEAREST);
-				buffer[offset4 + 3] = alpha[0];
+			if (this->m_ignoreAlpha) {
+				buffer[offset4 + 3] = 1.0f;
+			}
+			else {
+				if (this->m_alphaInput != NULL) {
+					this->m_alphaInput->read(alpha, x, y, COM_PS_NEAREST);
+					buffer[offset4 + 3] = alpha[0];
+				}
 			}
 			if (m_depthInput) {
 				this->m_depthInput->read(depth, x, y, COM_PS_NEAREST);
 				depthbuffer[offset] = depth[0];
 			}
 
-			if (this->m_straightAlpha)
-				straight_to_premul_v4(buffer + offset4);
-
 			offset ++;
 			offset4 += 4;
 		}