[gadamopoulos] 52544: [uxtheme] - Use double buffering when painting the caption

Author: gadamopoulos
Date: Tue Jul  5 10:15:09 2011
New Revision: 52544

URL: http://svn.reactos.org/svn/reactos?rev=52544&view=rev
Log:
[uxtheme]
- Use double buffering when painting the caption

Modified:
    branches/GSoC_2011/ThemesSupport/dll/win32/uxtheme/nonclient.c

Modified: branches/GSoC_2011/ThemesSupport/dll/win32/uxtheme/nonclient.c
URL: http://svn.reactos.org/svn/reactos/branches/GSoC_2011/ThemesSupport/dll/win3...
==============================================================================
--- branches/GSoC_2011/ThemesSupport/dll/win32/uxtheme/nonclient.c [iso-8859-1] (original)
+++ branches/GSoC_2011/ThemesSupport/dll/win32/uxtheme/nonclient.c [iso-8859-1] Tue Jul  5 10:15:09 2011
@@ -26,6 +26,10 @@
     BOOL Active; /* wi.dwWindowStatus isn't correct for mdi child windows */
     HRGN hRgn;
     int CaptionHeight;
+
+    /* for double buffering */
+    HDC hDCScreen;
+    HBITMAP hbmpOld;
 } DRAW_CONTEXT, *PDRAW_CONTEXT;

typedef enum 
@@ -59,6 +63,7 @@

#define BUTTON_GAP_SIZE 2

+#define MENU_BAR_ITEMS_SPACE (12)

HFONT hMenuFont = NULL;
 HFONT hMenuFontBold = NULL;
@@ -235,6 +240,29 @@
 }

static void 
+ThemeStartBufferedPaint(PDRAW_CONTEXT pcontext, int cx, int cy)
+{
+    HBITMAP hbmp;
+
+    pcontext->hDCScreen = pcontext->hDC;
+    pcontext->hDC = CreateCompatibleDC(pcontext->hDCScreen);
+    hbmp = CreateCompatibleBitmap(pcontext->hDCScreen, cx, cy); 
+    pcontext->hbmpOld = (HBITMAP)SelectObject(pcontext->hDC, hbmp);
+}
+
+static void
+ThemeEndBufferedPaint(PDRAW_CONTEXT pcontext, int x, int y, int cx, int cy)
+{
+    HBITMAP hbmp;
+    BitBlt(pcontext->hDCScreen, 0, 0, cx, cy, pcontext->hDC, x, y, SRCCOPY);
+    hbmp = (HBITMAP) SelectObject(pcontext->hDC, pcontext->hbmpOld);
+    DeleteObject(pcontext->hDC);
+    DeleteObject(hbmp);
+
+    pcontext->hDC = pcontext->hDCScreen;
+}
+
+static void 
 ThemeDrawCaptionButton(PDRAW_CONTEXT pcontext, 
                        RECT* prcCurrent, 
                        CAPTIONBUTTON buttonId, 
@@ -663,7 +691,9 @@

if((pcontext->wi.dwStyle & WS_CAPTION)==WS_CAPTION)
     {
+        ThemeStartBufferedPaint(pcontext, prcCurrent->right, pcontext->CaptionHeight);
         ThemeDrawCaption(pcontext, prcCurrent);
+        ThemeEndBufferedPaint(pcontext, 0, 0, prcCurrent->right, pcontext->CaptionHeight);
         ThemeDrawBorders(pcontext, prcCurrent);
     }
     else