Update to v106r41 release.

byuu says:

Changelog:

  - hiro: added Label::set(Background,Foreground)Color (not implemented
    on Cocoa backend)
  - hiro: added (Horizontal,Vertical)Layout::setPadding()
      - setMargin(m) is now an alias to setPadding({m, m, m, m})
  - hiro/Windows: update Label rendering to draw to an offscreen canvas
    to prevent flickering
  - sfc: reverted back to 224/240-line height (from 223/239-line height
    in earlier v106 WIPs)
  - bsnes: new multi-segment status bar added
  - bsnes: exiting fullscreen mode will resize and recenter window
      - this is required; the window geometry gets all scrambled when
        toggling fullscreen mode
  - bsnes: updated to a new logo [Ange Albertini]

Errata:

  - hiro/Windows: try to paint Label backgroundColor quicker to avoid
    startup flicker
      - `WM_ERASEBKGND` fallthrough to `WM_PAINT` seems to work
  - hiro/Qt: use Window backgroundColor for Label when no Label
    backgroundColor set
  - bsnes: update size multipliers in presentation.cpp to 224/240 (main
    window size is off in this WIP)

hiro/windows/widget/label.cpp

@@ -8,7 +8,6 @@ auto pLabel::construct() -> void {
     0, 0, 0, 0, _parentHandle(), nullptr, GetModuleHandle(0), 0);
   SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)&reference);
   pWidget::_setState();
-  setAlignment(state().alignment);
   setText(state().text);
 }
 
@@ -25,6 +24,14 @@ auto pLabel::setAlignment(Alignment alignment) -> void {
   InvalidateRect(hwnd, 0, false);
 }
 
+auto pLabel::setBackgroundColor(Color color) -> void {
+  InvalidateRect(hwnd, 0, false);
+}
+
+auto pLabel::setForegroundColor(Color color) -> void {
+  InvalidateRect(hwnd, 0, false);
+}
+
 auto pLabel::setText(const string& text) -> void {
   SetWindowText(hwnd, utf16_t(text));
   InvalidateRect(hwnd, 0, false);
@@ -44,20 +51,32 @@ static auto CALLBACK Label_windowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM
     BeginPaint(hwnd, &ps);
     RECT rc;
     GetClientRect(hwnd, &rc);
-    //todo: use DrawThemeParentBackground if Label is inside TabFrame
-    if(auto brush = window->self()->hbrush) {
-      FillRect(ps.hdc, &rc, brush);
-    } else {
-      DrawThemeParentBackground(hwnd, ps.hdc, &rc);
-    }
-    SetBkMode(ps.hdc, TRANSPARENT);
-    SelectObject(ps.hdc, label->self()->hfont);
+
+    auto hdcMemory = CreateCompatibleDC(ps.hdc);
+    auto hbmMemory = CreateCompatibleBitmap(ps.hdc, rc.right - rc.left, rc.bottom - rc.top);
+    SelectObject(hdcMemory, hbmMemory);
+
     uint length = GetWindowTextLength(hwnd);
     wchar_t text[length + 1];
     GetWindowText(hwnd, text, length + 1);
     text[length] = 0;
-    DrawText(ps.hdc, text, -1, &rc, DT_CALCRECT | DT_END_ELLIPSIS);
+
+    //todo: use DrawThemeParentBackground if Label is inside TabFrame
+    if(auto color = label->backgroundColor()) {
+      auto brush = CreateSolidBrush(CreateRGB(color));
+      FillRect(hdcMemory, &rc, brush);
+      DeleteObject(brush);
+    } else if(auto brush = window->self()->hbrush) {
+      FillRect(hdcMemory, &rc, brush);
+    } else {
+      DrawThemeParentBackground(hwnd, hdcMemory, &rc);
+    }
+
+    SetBkMode(hdcMemory, TRANSPARENT);
+    SelectObject(hdcMemory, label->self()->hfont);
+    DrawText(hdcMemory, text, -1, &rc, DT_CALCRECT | DT_END_ELLIPSIS);
     uint height = rc.bottom;
+
     GetClientRect(hwnd, &rc);
     rc.top = (rc.bottom - height) / 2;
     rc.bottom = rc.top + height;
@@ -67,7 +86,15 @@ static auto CALLBACK Label_windowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM
     uint verticalAlignment = DT_VCENTER;
     if(label->alignment().vertical() < 0.333) verticalAlignment = DT_TOP;
     if(label->alignment().vertical() > 0.666) verticalAlignment = DT_BOTTOM;
-    DrawText(ps.hdc, text, -1, &rc, DT_END_ELLIPSIS | horizontalAlignment | verticalAlignment);
+    if(auto color = label->foregroundColor()) {
+      SetTextColor(hdcMemory, CreateRGB(color));
+    }
+    DrawText(hdcMemory, text, -1, &rc, DT_END_ELLIPSIS | horizontalAlignment | verticalAlignment);
+
+    GetClientRect(hwnd, &rc);
+    BitBlt(ps.hdc, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, hdcMemory, 0, 0, SRCCOPY);
+    DeleteObject(hbmMemory);
+    DeleteObject(hdcMemory);
     EndPaint(hwnd, &ps);
     return false;
   }

hiro/windows/widget/label.hpp

@@ -7,6 +7,8 @@ struct pLabel : pWidget {
 
   auto minimumSize() const -> Size override;
   auto setAlignment(Alignment alignment) -> void;
+  auto setBackgroundColor(Color color) -> void;
+  auto setForegroundColor(Color color) -> void;
   auto setText(const string& text) -> void;
 };