MISC: Add a parallel_for macro for `#pragma omp parallel for \nfor (...)`

This is done to have a good formating with clang-format

.clang-format

@@ -63,6 +63,7 @@ ForEachMacros:
   - 'FOR_EVER_IF'
   - 'FOR_EVER_UNTIL'
   - 'FOR_EACH_FLAT_LIST_ITEM'
+  - 'parallel_for'
 
 IncludeCategories:
   - Regex: '.*'

src/Lib/Utils.hh

@@ -10,8 +10,13 @@
 #include <QtGlobal>
 #include <type_traits>
 
+// Prety define for OpenMP's parallel for loop with indentation not fucked up
+// by clang-format.
+#define parallel_for                                                                               \
+    _Pragma("omp parallel for") for
+
+// Don't move this object, create it in one place and never move it again.
 #define VIVY_UNMOVABLE_OBJECT(classname)                                                           \
-    /* Don't move this object around */                                                            \
     classname(const classname &) = delete;            /* Copy */                                   \
     classname(classname &&)      = delete;            /* Move */                                   \
     classname &operator=(const classname &) = delete; /* Copy assign */                            \

src/UI/AudioVisualizer.cc

@@ -55,8 +55,7 @@ AudioVisualizer::AudioVisualizer(AudioContext::StreamPtr stream, QWidget *parent
     /* Compute the image data */
 
     for (size_t x = 0, i = 0; i < size - height; i += decalage, ++x) {
-#pragma omp parallel for
-        for (size_t j = 0; j < height; j++) {
+        parallel_for (size_t j = 0; j < height; j++) {
             const double curr_dat = decodedData[i + j];
             const double window_modifier =
                 (1 - cos(2 * M_PI * static_cast<double>(j) / static_cast<double>(height - 1))) / 2;
@@ -67,8 +66,7 @@ AudioVisualizer::AudioVisualizer(AudioContext::StreamPtr stream, QWidget *parent
 
         av_rdft_calc(ctx.get(), chunkData.get());
 
-#pragma omp parallel for
-        for (size_t j = 0; j < height / 2; j++) {
+        parallel_for (size_t j = 0; j < height / 2; j++) {
             const float im     = chunkData[j * 2];
             const float re     = chunkData[j * 2 + 1];
             const float mag    = sqrtf(im * im + re * re);