DebugTools: support half floats in CompareImage for pixel views.

For images it was supported already, but here I forgot somehow.

src/Magnum/DebugTools/CompareImage.h

@@ -662,6 +662,12 @@ template<> constexpr PixelFormat pixelFormatFor<Int>(PixelFormat) {
 template<> constexpr PixelFormat pixelFormatFor<Math::Vector<1, Int>>(PixelFormat expected) {
     return pixelFormatFor<Int>(expected);
 }
+template<> constexpr PixelFormat pixelFormatFor<Half>(PixelFormat) {
+    return PixelFormat::R16F;
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector<1, Half>>(PixelFormat expected) {
+    return pixelFormatFor<Half>(expected);
+}
 template<> constexpr PixelFormat pixelFormatFor<Float>(PixelFormat) {
     return PixelFormat::R32F;
 }
@@ -717,6 +723,12 @@ template<> constexpr PixelFormat pixelFormatFor<Math::Vector2<Int>>(PixelFormat)
 template<> constexpr PixelFormat pixelFormatFor<Math::Vector<2, Int>>(PixelFormat expected) {
     return pixelFormatFor<Math::Vector2<Int>>(expected);
 }
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector2<Half>>(PixelFormat) {
+    return PixelFormat::RG16F;
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector<2, Half>>(PixelFormat expected) {
+    return pixelFormatFor<Math::Vector2<Half>>(expected);
+}
 template<> constexpr PixelFormat pixelFormatFor<Math::Vector2<Float>>(PixelFormat) {
     return PixelFormat::RG32F;
 }
@@ -792,6 +804,15 @@ template<> constexpr PixelFormat pixelFormatFor<Math::Vector<3, Int>>(PixelForma
 }
 /* Skipping Math::Color3<Int>, as integer colors should always match normalized
    types */
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector3<Half>>(PixelFormat) {
+    return PixelFormat::RGB16F;
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector<3, Half>>(PixelFormat expected) {
+    return pixelFormatFor<Math::Vector3<Half>>(expected);
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Color3<Half>>(PixelFormat) {
+    return PixelFormat::RGB16F;
+}
 template<> constexpr PixelFormat pixelFormatFor<Math::Vector3<Float>>(PixelFormat) {
     return PixelFormat::RGB32F;
 }
@@ -872,6 +893,15 @@ template<> constexpr PixelFormat pixelFormatFor<Math::Vector<4, Int>>(PixelForma
 }
 /* Skipping Math::Color4<Int>, as integer colors should always match normalized
    types */
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector4<Half>>(PixelFormat) {
+    return PixelFormat::RGBA16F;
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Vector<4, Half>>(PixelFormat expected) {
+    return pixelFormatFor<Math::Vector4<Half>>(expected);
+}
+template<> constexpr PixelFormat pixelFormatFor<Math::Color4<Half>>(PixelFormat) {
+    return PixelFormat::RGBA16F;
+}
 template<> constexpr PixelFormat pixelFormatFor<Math::Vector4<Float>>(PixelFormat) {
     return PixelFormat::RGBA32F;
 }

src/Magnum/DebugTools/Test/CompareImageTest.cpp

@@ -1709,6 +1709,9 @@ template<UnsignedInt dimensions> void CompareImageTest::pixelFormatFor() {
     CORRADE_COMPARE(
         (Implementation::pixelFormatFor<Math::Vector<dimensions, Int>>(PixelFormat{})),
         pixelFormat(PixelFormat::R32I, dimensions, false));
+    CORRADE_COMPARE(
+        (Implementation::pixelFormatFor<Math::Vector<dimensions, Half>>(PixelFormat{})),
+        pixelFormat(PixelFormat::R16F, dimensions, false));
     CORRADE_COMPARE(
         (Implementation::pixelFormatFor<Math::Vector<dimensions, Float>>(PixelFormat{})),
         pixelFormat(PixelFormat::R32F, dimensions, false));
@@ -1767,6 +1770,12 @@ void CompareImageTest::pixelFormatForColor() {
     CORRADE_COMPARE(
         (Implementation::pixelFormatFor<Math::Color4<Short>>(PixelFormat{})),
         PixelFormat::RGBA16Snorm);
+    CORRADE_COMPARE(
+        (Implementation::pixelFormatFor<Color3h>(PixelFormat{})),
+        PixelFormat::RGB16F);
+    CORRADE_COMPARE(
+        (Implementation::pixelFormatFor<Color4h>(PixelFormat{})),
+        PixelFormat::RGBA16F);
     CORRADE_COMPARE(
         (Implementation::pixelFormatFor<Color3>(PixelFormat{})),
         PixelFormat::RGB32F);