Allow to specify a functor to extract data from QTextureImageData

Change-Id: Idd052f6c24665a1accd2cd681c80fe74846e5c39
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/src/render/texture/qtextureimagedata.cpp b/src/render/texture/qtextureimagedata.cpp
index 50a52d90f..4841cebdf 100644
--- a/src/render/texture/qtextureimagedata.cpp
+++ b/src/render/texture/qtextureimagedata.cpp
@@ -88,6 +88,9 @@ QByteArray QTextureImageDataPrivate::data(int layer, int face, int mipmapLevel)
         return QByteArray();
     }
 
+    if (m_dataExtractor)
+        return m_dataExtractor(layer, face, mipmapLevel);
+
     if (m_isKtx)
         return ktxData(layer, face, mipmapLevel);
 
@@ -113,6 +116,15 @@ void QTextureImageDataPrivate::setData(const QByteArray &data,
     m_blockSize = blockSize;
 }
 
+void QTextureImageDataPrivate::setData(const QByteArray &data,
+                                       std::function<QByteArray(int layer, int face, int mipmapLevel)> dataExtractor,
+                                       bool isCompressed)
+{
+    m_isCompressed = isCompressed;
+    m_data = data;
+    m_dataExtractor = dataExtractor;
+}
+
 int QTextureImageDataPrivate::ddsLayerSize() const
 {
     return m_faces * ddsFaceSize();
diff --git a/src/render/texture/qtextureimagedata_p.h b/src/render/texture/qtextureimagedata_p.h
index ee12d3387..30968e199 100644
--- a/src/render/texture/qtextureimagedata_p.h
+++ b/src/render/texture/qtextureimagedata_p.h
@@ -64,6 +64,9 @@ public:
     QTextureImageDataPrivate();
 
     void setData(const QByteArray &data, int blockSize, bool isCompressed);
+    void setData(const QByteArray &data,
+                 std::function<QByteArray(int layer, int face, int mipmapLevel)> dataExtractor,
+                 bool isCompressed);
 
     bool setCompressedFile(const QString &source);
 
@@ -90,6 +93,7 @@ public:
     // public API changes. Consider https://codereview.qt-project.org/#/c/178474/ for Qt 6.
     bool m_isKtx;
     QByteArray m_data;
+    std::function<QByteArray(int layer, int face, int mipmapLevel)> m_dataExtractor;
 
     static QTextureImageDataPrivate *get(QTextureImageData *imageData);