Allow conversion of Image and Trade::ImageData to ImageReference.

src/Image.h

@@ -28,9 +28,7 @@
  * @brief Class Magnum::Image, typedef Magnum::Image1D, Magnum::Image2D, Magnum::Image3D
  */
 
-#include "Math/Vector3.h"
-#include "AbstractImage.h"
-#include "DimensionTraits.h"
+#include "ImageReference.h"
 
 namespace Magnum {
 
@@ -82,6 +80,13 @@ template<UnsignedInt dimensions> class Image: public AbstractImage {
         /** @brief Destructor */
         ~Image() { delete[] _data; }
 
+        /**
+         * @brief Conversion to reference
+         *
+         * @todo GCC 4.8: don't allow this on rvalue-ref
+         */
+        /*implicit*/ operator ImageReference<dimensions>() const;
+
         /** @brief %Image size */
         typename DimensionTraits<Dimensions, Int>::VectorType size() const { return _size; }
 
@@ -127,6 +132,10 @@ template<UnsignedInt dimensions> inline Image<dimensions>& Image<dimensions>::op
     return *this;
 }
 
+template<UnsignedInt dimensions> inline Image<dimensions>::operator ImageReference<dimensions>() const {
+    return ImageReference<dimensions>(_size, this->format(), this->type(), _data);
+}
+
 }
 
 #endif

src/Test/ImageTest.cpp

@@ -35,11 +35,13 @@ class ImageTest: public TestSuite::Tester {
 
         void moveConstructor();
         void moveAssignment();
+        void toReference();
 };
 
 ImageTest::ImageTest() {
     addTests({&ImageTest::moveConstructor,
-              &ImageTest::moveAssignment});
+              &ImageTest::moveAssignment,
+              &ImageTest::toReference});
 }
 
 void ImageTest::moveConstructor() {
@@ -67,6 +69,17 @@ void ImageTest::moveAssignment() {
     CORRADE_VERIFY(b.data() == data);
 }
 
+void ImageTest::toReference() {
+    unsigned char* data = new unsigned char[3];
+    Image2D a({1, 3}, ImageFormat::Red, ImageType::UnsignedByte, data);
+
+    ImageReference2D b = a;
+    CORRADE_COMPARE(b.format(), ImageFormat::Red);
+    CORRADE_COMPARE(b.type(), ImageType::UnsignedByte);
+    CORRADE_COMPARE(b.size(), Vector2i(1, 3));
+    CORRADE_VERIFY(b.data() == data);
+}
+
 }}
 
 CORRADE_TEST_MAIN(Magnum::Test::ImageTest)

src/Trade/ImageData.h

@@ -28,9 +28,7 @@
  * @brief Class Magnum::Trade::ImageData
  */
 
-#include "Math/Vector3.h"
-#include "AbstractImage.h"
-#include "DimensionTraits.h"
+#include "ImageReference.h"
 
 namespace Magnum { namespace Trade {
 
@@ -72,6 +70,13 @@ template<UnsignedInt dimensions> class ImageData: public AbstractImage {
         /** @brief Destructor */
         ~ImageData() { delete[] _data; }
 
+        /**
+         * @brief Conversion to reference
+         *
+         * @todo GCC 4.8: don't allow this on rvalue-ref
+         */
+        /*implicit*/ operator ImageReference<dimensions>() const;
+
         /** @brief %Image size */
         typename DimensionTraits<Dimensions, Int>::VectorType size() const { return _size; }
 
@@ -105,6 +110,10 @@ template<UnsignedInt dimensions> inline ImageData<dimensions>& ImageData<dimensi
     return *this;
 }
 
+template<UnsignedInt dimensions> inline ImageData<dimensions>::operator ImageReference<dimensions>() const {
+    return ImageReference<dimensions>(_size, this->format(), this->type(), _data);
+}
+
 }}
 
 #endif

src/Trade/Test/ImageDataTest.cpp

@@ -35,11 +35,13 @@ class ImageDataTest: public TestSuite::Tester {
 
         void moveConstructor();
         void moveAssignment();
+        void toReference();
 };
 
 ImageDataTest::ImageDataTest() {
     addTests({&ImageDataTest::moveConstructor,
-              &ImageDataTest::moveAssignment});
+              &ImageDataTest::moveAssignment,
+              &ImageDataTest::toReference});
 }
 
 void ImageDataTest::moveConstructor() {
@@ -67,6 +69,17 @@ void ImageDataTest::moveAssignment() {
     CORRADE_VERIFY(b.data() == data);
 }
 
+void ImageDataTest::toReference() {
+    unsigned char* data = new unsigned char[3];
+    Trade::ImageData2D a({1, 3}, ImageFormat::Red, ImageType::UnsignedByte, data);
+
+    ImageReference2D b = a;
+    CORRADE_COMPARE(b.format(), ImageFormat::Red);
+    CORRADE_COMPARE(b.type(), ImageType::UnsignedByte);
+    CORRADE_COMPARE(b.size(), Vector2i(1, 3));
+    CORRADE_COMPARE(b.data(), data);
+}
+
 }}}
 
 CORRADE_TEST_MAIN(Magnum::Trade::Test::ImageDataTest)