From 114dfcb89561d36c9b04779747fdce0b58e766d3 Mon Sep 17 00:00:00 2001
From: Jakub Melka <Jakub.Melka@seznam.cz>
Date: Thu, 18 Feb 2021 18:34:29 +0100
Subject: [PATCH] Bugfix: cmyk over spot color

---
 Pdf4QtLib/sources/pdftransparencyrenderer.cpp | 12 ++++++++++++
 Pdf4QtLib/sources/pdftransparencyrenderer.h   |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/Pdf4QtLib/sources/pdftransparencyrenderer.cpp b/Pdf4QtLib/sources/pdftransparencyrenderer.cpp
index b765229..a20ce99 100644
--- a/Pdf4QtLib/sources/pdftransparencyrenderer.cpp
+++ b/Pdf4QtLib/sources/pdftransparencyrenderer.cpp
@@ -148,6 +148,11 @@ void PDFFloatBitmap::setAllColorActive()
     std::fill(m_activeColorMask.begin(), m_activeColorMask.end(), PDFPixelFormat::getAllColorsMask());
 }
 
+void PDFFloatBitmap::setAllColorInactive()
+{
+    std::fill(m_activeColorMask.begin(), m_activeColorMask.end(), 0);
+}
+
 PDFFloatBitmap PDFFloatBitmap::extractProcessColors() const
 {
     PDFPixelFormat format = PDFPixelFormat::createFormat(m_format.getProcessColorChannelCount(), 0, false, m_format.hasProcessColorsSubtractive(), false);
@@ -363,6 +368,12 @@ void PDFFloatBitmap::blend(const PDFFloatBitmap& source,
                 continue;
             }
 
+            if (target.hasActiveColorMask())
+            {
+                const uint32_t activeColorChannels = source.hasActiveColorMask() ? source.getPixelActiveColorMask(x, y) : PDFPixelFormat::getAllColorsMask();
+                target.markPixelActiveColorMask(x, y, activeColorChannels);
+            }
+
             std::fill(B_i.begin(), B_i.end(), 0.0f);
 
             // Calculate blended pixel
@@ -2289,6 +2300,7 @@ void PDFTransparencyRenderer::PDFTransparencyGroupPainterData::makeInitialBackdr
 void PDFTransparencyRenderer::PDFTransparencyGroupPainterData::makeImmediateBackdropTransparent()
 {
     immediateBackdrop.makeTransparent();
+    immediateBackdrop.setAllColorInactive();
 }
 
 void PDFTransparencyRenderer::PDFTransparencyGroupPainterData::makeSoftMaskOpaque()
diff --git a/Pdf4QtLib/sources/pdftransparencyrenderer.h b/Pdf4QtLib/sources/pdftransparencyrenderer.h
index 9079e56..312ace6 100644
--- a/Pdf4QtLib/sources/pdftransparencyrenderer.h
+++ b/Pdf4QtLib/sources/pdftransparencyrenderer.h
@@ -205,6 +205,9 @@ public:
     /// Sets all colors as active
     void setAllColorActive();
 
+    /// Sets all colors as inactive
+    void setAllColorInactive();
+
     /// Extract process colors into another bitmap
     PDFFloatBitmap extractProcessColors() const;