[PATCH v2 2/2] gdiplus: Implement font linking in GdipDrawString.

[Santino Mazza]

From: Santino Mazza

---
 dlls/gdiplus/graphics.c | 66 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 63 insertions(+), 3 deletions(-)

diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index 65b33cdc960..5315da89d49 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -30,6 +30,7 @@
 #include "ocidl.h"
 #include "olectl.h"
 #include "ole2.h"
+#include "mlang.h"

#include "winreg.h"
 #include "shlwapi.h"
@@ -5641,13 +5642,71 @@ static GpStatus draw_string_callback(HDC hdc,
     struct draw_string_args *args = user_data;
     PointF position;
     GpStatus stat;
+    IMLangFontLink2 *iMLFL2;
+    DWORD codepages, font_codepages;
+    INT current_index, current_length;
+    LONG processed;
+    HFONT new_font, old_font, hfont;
+    GpFont *new_gpfont;
+    LOGFONTW lfw;
+    HRESULT hr;

position.X = args->x + bounds->X / args->rel_width;
     position.Y = args->y + bounds->Y / args->rel_height + args->ascent;

-    stat = draw_driver_string(args->graphics, &string[index], length, font, format,
-        args->brush, &position,
-        DriverStringOptionsCmapLookup|DriverStringOptionsRealizedAdvance, NULL);
+    if (FAILED(hr = CoCreateInstance(&CLSID_CMultiLanguage, NULL, CLSCTX_ALL, &IID_IMLangFontLink2, (void**)&iMLFL2)))
+    {
+        ERR("Failed to create font linking interface %lx\n", hr);
+        return hr;
+    };
+
+    get_font_hfont(args->graphics, font, format, &hfont, &lfw, NULL);
+    IMLangFontLink2_GetFontCodePages(iMLFL2, hdc, hfont, &font_codepages);
+
+    current_index = index;
+    current_length = length;
+    do
+    {
+        IMLangFontLink2_GetStrCodePages(iMLFL2, &string[current_index], current_length, 0, &codepages, &processed);
+        if (font_codepages & codepages) /* if the font supports the required codepages don't do anything. */
+            stat = draw_driver_string(args->graphics, &string[current_index], processed, font, format,
+                args->brush, &position,
+                DriverStringOptionsCmapLookup|DriverStringOptionsRealizedAdvance, NULL);
+        else
+        {
+            old_font = SelectObject(hdc, hfont);
+            hr = IMLangFontLink2_MapFont(iMLFL2, hdc, codepages, 0, &new_font);
+            if (FAILED(hr))
+            {
+                SelectObject(hdc, old_font);
+                break;
+            }
+            SelectObject(hdc, new_font);
+            stat = GdipCreateFontFromDC(hdc, &new_gpfont);
+            if (stat != Ok)
+            {
+                SelectObject(hdc, old_font);
+                IMLangFontLink2_ReleaseFont(iMLFL2, new_font);
+                break;
+            }
+            SelectObject(hdc, old_font);
+            stat = draw_driver_string(args->graphics, &string[current_index], processed, new_gpfont, format,
+                args->brush, &position,
+                DriverStringOptionsCmapLookup|DriverStringOptionsRealizedAdvance, NULL);
+            IMLangFontLink2_ReleaseFont(iMLFL2, new_font);
+        }
+
+        current_index += processed;
+        current_length -= processed;
+    }
+    while (current_length > 0);
+
+    if (stat != Ok || FAILED(hr)) /* If font linking failed, draw the rest without it. */
+    {
+        stat = draw_driver_string(args->graphics, &string[current_index], current_length, font, format,
+                args->brush, &position,
+                DriverStringOptionsCmapLookup|DriverStringOptionsRealizedAdvance, NULL);
+    }

if (stat == Ok && underlined_index_count)
     {
@@ -5676,6 +5735,7 @@ static GpStatus draw_string_callback(HDC hdc,
         }
     }

+    IMLangFontLink2_Release(iMLFL2);
     return stat;
 }