Revert "tdf#117517: Fix OpenGL text rendering on Windows"

This actually breaks the OpenGL glyph cache, which forced a full
redraw all the time working around the original problem, which
is now fixed with commit fad862e290d727fc9fefe206f6e4b807482c4175.

This reverts commit c5f8a296fcfc08f8ac441cb8300a7565caa50b53.

Change-Id: Ibfc5a24dfc157c42b4cf796b35101191e88a6d15
Reviewed-on: https://gerrit.libreoffice.org/57221
Tested-by: Jenkins
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>

2 files changed, 22 insertions, 4 deletions

diff --git a/vcl/inc/win/winlayout.hxx b/vcl/inc/win/winlayout.hxx
index 0b7c23bfc9a5..0ef5cc03b846 100644
--- a/vcl/inc/win/winlayout.hxx
+++ b/vcl/inc/win/winlayout.hxx
@@ -150,7 +150,7 @@ class WinFontInstance : public LogicalFontInstance
 public:
     virtual ~WinFontInstance() override;
 
-    bool CacheGlyphToAtlas(HDC hDC, int nGlyphIndex, SalGraphics& rGraphics);
+    bool CacheGlyphToAtlas(HDC hDC, HFONT hFont, int nGlyphIndex, SalGraphics& rGraphics);
     GlyphCache& GetGlyphCache() { return maGlyphCache; }
     bool hasHScale() const;
 
diff --git a/vcl/win/gdi/winlayout.cxx b/vcl/win/gdi/winlayout.cxx
index 0cd916952b3e..fa0c2b683387 100644
--- a/vcl/win/gdi/winlayout.cxx
+++ b/vcl/win/gdi/winlayout.cxx
@@ -55,10 +55,24 @@ GlobalGlyphCache * GlobalGlyphCache::get() {
     return data->m_pGlobalGlyphCache.get();
 }
 
-bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, int nGlyphIndex, SalGraphics& rGraphics)
+bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, HFONT hFont, int nGlyphIndex, SalGraphics& rGraphics)
 {
     OpenGLGlyphDrawElement aElement;
 
+    ScopedHDC aHDC(CreateCompatibleDC(hDC));
+
+    if (!aHDC)
+    {
+        SAL_WARN("vcl.gdi", "CreateCompatibleDC failed: " << WindowsErrorString(GetLastError()));
+        return false;
+    }
+    HFONT hOrigFont = static_cast<HFONT>(SelectObject(aHDC.get(), hFont));
+    if (hOrigFont == nullptr)
+    {
+        SAL_WARN("vcl.gdi", "SelectObject failed: " << WindowsErrorString(GetLastError()));
+        return false;
+    }
+
     // For now we assume DWrite is present and we won't bother with fallback paths.
     D2DWriteTextOutRenderer * pTxt = dynamic_cast<D2DWriteTextOutRenderer *>(&TextOutRenderer::get(true));
     if (!pTxt)
@@ -66,7 +80,7 @@ bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, int nGlyphIndex, SalGraphics& r
 
     pTxt->changeTextAntiAliasMode(D2DTextAntiAliasMode::AntiAliased);
 
-    if (!pTxt->BindFont(hDC))
+    if (!pTxt->BindFont(aHDC.get()))
     {
         SAL_WARN("vcl.gdi", "Binding of font failed. The font might not be supported by DirectWrite.");
         return false;
@@ -179,6 +193,7 @@ bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, int nGlyphIndex, SalGraphics& r
         break;
     default:
         SAL_WARN("vcl.gdi", "DrawGlyphRun-EndDraw failed: " << WindowsErrorString(GetLastError()));
+        SelectFont(aDC.getCompatibleHDC(), hOrigFont);
         return false;
     }
 
@@ -191,6 +206,8 @@ bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, int nGlyphIndex, SalGraphics& r
 
     maGlyphCache.PutDrawElementInCache(aElement, nGlyphIndex);
 
+    SelectFont(aDC.getCompatibleHDC(), hOrigFont);
+
     return true;
 }
 
@@ -386,6 +403,7 @@ bool WinSalGraphics::CacheGlyphs(const GenericSalLayout& rLayout)
 
     HDC hDC = getHDC();
     WinFontInstance& rFont = *static_cast<WinFontInstance*>(&rLayout.GetFont());
+    HFONT hFONT = rFont.GetHFONT();
 
     int nStart = 0;
     Point aPos(0, 0);
@@ -394,7 +412,7 @@ bool WinSalGraphics::CacheGlyphs(const GenericSalLayout& rLayout)
     {
         if (!rFont.GetGlyphCache().IsGlyphCached(pGlyph->maGlyphId))
         {
-            if (!rFont.CacheGlyphToAtlas(hDC, pGlyph->maGlyphId, *this))
+            if (!rFont.CacheGlyphToAtlas(hDC, hFONT, pGlyph->maGlyphId, *this))
                 return false;
         }
     }