core: conform to output transforms (#224)

src/helpers/Monitor.cpp

@@ -1,8 +1,15 @@
 #include "Monitor.hpp"
 #include "../Hyprpaper.hpp"
+#include "MiscFunctions.hpp"
 
 void SMonitor::registerListeners() {
-    output->setMode([this](CCWlOutput* r, uint32_t flags, int32_t width, int32_t height, int32_t refresh) { size = Vector2D(width, height); });
+    output->setMode([this](CCWlOutput* r, uint32_t flags, int32_t width, int32_t height, int32_t refresh) {
+        size = Vector2D(width, height);
+
+        //ensures any transforms are also taken care of when setting the mode
+        if (transform & 1)
+            std::swap(size.x, size.y);
+    });
 
     output->setDone([this](CCWlOutput* r) {
         readyForLS = true;
@@ -21,4 +28,16 @@ void SMonitor::registerListeners() {
 
         description = desc;
     });
-}
+
+    output->setGeometry([this](CCWlOutput* r, int32_t x, int32_t y, int32_t width_mm, int32_t height_mm, int32_t subpixel, const char* make, const char* model,
+                               int32_t transform_) { //
+        /*
+         see https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_output-enum-transform
+         If there is a difference in parity of the old vs new transforms, the size needs to be swapped.
+        */
+        if ((transform ^ transform_) & 1)
+            std::swap(size.x, size.y);
+
+        transform = (wl_output_transform)transform_;
+    });
+}

src/helpers/Monitor.hpp

@@ -12,6 +12,7 @@ struct SMonitor {
     uint32_t                                    wayland_name = 0;
     Vector2D                                    size;
     int                                         scale;
+    wl_output_transform                         transform = WL_OUTPUT_TRANSFORM_NORMAL;
 
     bool                                        readyForLS = false;
     bool                                        hasATarget = true;