Fix pixel pitch handling for DXGI_FORMAT_R16G16B16A16_FLOAT (#605)

src/platform/windows/display.h

@@ -131,6 +131,11 @@ public:
   } D3DKMT_SCHEDULINGPRIORITYCLASS;
 
   typedef NTSTATUS WINAPI (*PD3DKMTSetProcessSchedulingPriorityClass)(HANDLE, D3DKMT_SCHEDULINGPRIORITYCLASS);
+
+protected:
+  int get_pixel_pitch() {
+    return (format == DXGI_FORMAT_R16G16B16A16_FLOAT) ? 8 : 4;
+  }
 };
 
 class display_ram_t : public display_base_t {

src/platform/windows/display_ram.cpp

@@ -280,7 +280,7 @@ capture_e display_ram_t::snapshot(::platf::img_t *img_base, std::chrono::millise
 std::shared_ptr<platf::img_t> display_ram_t::alloc_img() {
   auto img = std::make_shared<img_t>();
 
-  img->pixel_pitch = 4;
+  img->pixel_pitch = get_pixel_pitch();
   img->row_pitch   = img_info.RowPitch;
   img->width       = width;
   img->height      = height;

src/platform/windows/display_vram.cpp

@@ -757,7 +757,7 @@ int display_vram_t::init(int framerate, const std::string &display_name) {
 std::shared_ptr<platf::img_t> display_vram_t::alloc_img() {
   auto img = std::make_shared<img_d3d_t>();
 
-  img->pixel_pitch = 4;
+  img->pixel_pitch = get_pixel_pitch();
   img->row_pitch   = img->pixel_pitch * width;
   img->width       = width;
   img->height      = height;
@@ -802,13 +802,14 @@ int display_vram_t::dummy_img(platf::img_t *img_base) {
     return 0;
   }
 
-  img->row_pitch  = width * 4;
+  img->pixel_pitch = get_pixel_pitch();
-  auto dummy_data = std::make_unique<int[]>(width * height);
+  img->row_pitch   = img->pixel_pitch * width;
+  auto dummy_data  = std::make_unique<uint8_t[]>(img->row_pitch * height);
   D3D11_SUBRESOURCE_DATA data {
     dummy_data.get(),
     (UINT)img->row_pitch
   };
-  std::fill_n(dummy_data.get(), width * height, 0);
+  std::fill_n(dummy_data.get(), img->row_pitch * height, 0);
 
   D3D11_TEXTURE2D_DESC t {};
   t.Width            = width;