riched20: Add support for TXTBACK_TRANSPARENT.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/riched20/editor.c

@@ -3037,6 +3037,9 @@ ME_TextEditor *ME_MakeEditor(ITextHost *texthost, BOOL bEmulateVersion10)
 
   ed->wheel_remain = 0;
 
+  ed->back_style = TXTBACK_OPAQUE;
+  ITextHost_TxGetBackStyle( texthost, &ed->back_style );
+
   list_init( &ed->reobj_list );
   OleInitialize(NULL);
 

dlls/riched20/editstr.h

@@ -436,6 +436,7 @@ typedef struct tagME_TextEditor
   BOOL caret_hidden;
   BOOL bMouseCaptured;
   int wheel_remain;
+  TXTBACKSTYLE back_style;
   struct list style_list;
   struct list reobj_list;
   struct wine_rb_tree marked_paras;

dlls/riched20/paint.c

@@ -25,6 +25,11 @@ WINE_DEFAULT_DEBUG_CHANNEL(richedit);
 
 static void draw_paragraph( ME_Context *c, ME_Paragraph *para );
 
+static inline BOOL editor_opaque( ME_TextEditor *editor )
+{
+    return editor->back_style != TXTBACK_TRANSPARENT;
+}
+
 void editor_draw( ME_TextEditor *editor, HDC hDC, const RECT *update )
 {
   ME_Paragraph *para;
@@ -78,6 +83,8 @@ void editor_draw( ME_TextEditor *editor, HDC hDC, const RECT *update )
       draw_paragraph( &c, para );
     para = para_next( para );
   }
+  if (editor_opaque( editor ))
+  {
     if (c.pt.y + editor->nTotalLength < c.rcView.bottom)
     { /* space after the end of the text */
       rc.top = c.pt.y + editor->nTotalLength;
@@ -96,6 +103,7 @@ void editor_draw( ME_TextEditor *editor, HDC hDC, const RECT *update )
       if (IntersectRect( &rc, &rc, update ))
         PatBlt( hDC, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, PATCOPY );
     }
+  }
   if (editor->nTotalLength != editor->nLastTotalLength || editor->nTotalWidth != editor->nLastTotalWidth)
     ME_SendRequestResize(editor, FALSE);
   editor->nLastTotalLength = editor->nTotalLength;
@@ -596,24 +604,30 @@ static void ME_DrawParaDecoration(ME_Context* c, ME_Paragraph* para, int y, RECT
   }
 
   if (para->fmt.dwMask & PFM_SPACEBEFORE)
+  {
+    bounds->top = ME_twips2pointsY(c, para->fmt.dySpaceBefore);
+    if (editor_opaque( c->editor ))
     {
       rc.left = c->rcView.left;
       rc.right = c->rcView.right;
       rc.top = y;
-    bounds->top = ME_twips2pointsY(c, para->fmt.dySpaceBefore);
       rc.bottom = y + bounds->top + top_border;
       PatBlt(c->hDC, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, PATCOPY);
     }
+  }
 
   if (para->fmt.dwMask & PFM_SPACEAFTER)
+  {
+    bounds->bottom = ME_twips2pointsY(c, para->fmt.dySpaceAfter);
+    if (editor_opaque( c->editor ))
     {
       rc.left = c->rcView.left;
       rc.right = c->rcView.right;
       rc.bottom = y + para->nHeight;
-    bounds->bottom = ME_twips2pointsY(c, para->fmt.dySpaceAfter);
       rc.top = rc.bottom - bounds->bottom - bottom_border;
       PatBlt(c->hDC, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, PATCOPY);
     }
+  }
 
   /* Native richedit doesn't support paragraph borders in v1.0 - 4.1,
    * but might support it in later versions. */
@@ -730,7 +744,7 @@ static void draw_table_borders( ME_Context *c, ME_Paragraph *para )
         rc.top = top + width;
         width = cell->yTextOffset - width;
         rc.bottom = rc.top + width;
-        if (width)
+        if (width && editor_opaque( c->editor ))
           PatBlt(c->hDC, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, PATCOPY);
       }
       /* Draw cell borders.
@@ -973,7 +987,7 @@ static void draw_paragraph( ME_Context *c, ME_Paragraph *para )
           rc.bottom = y + p->member.row.nHeight;
         }
         visible = RectVisible(c->hDC, &rc);
-        if (visible)
+        if (editor_opaque( c->editor ) && visible)
           PatBlt(c->hDC, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, PATCOPY);
         if (bounds.right)
         {
@@ -982,7 +996,7 @@ static void draw_paragraph( ME_Context *c, ME_Paragraph *para )
           RECT after_bdr = rc;
           after_bdr.left = rc.right + bounds.right;
           after_bdr.right = c->rcView.right;
-          if (RectVisible(c->hDC, &after_bdr))
+          if (editor_opaque( c->editor ) && RectVisible( c->hDC, &after_bdr ))
             PatBlt(c->hDC, after_bdr.left, after_bdr.top, after_bdr.right - after_bdr.left,
                    after_bdr.bottom - after_bdr.top, PATCOPY);
         }
@@ -1035,7 +1049,7 @@ static void draw_paragraph( ME_Context *c, ME_Paragraph *para )
     no++;
   }
 
-    if (para_cell( para ))
+    if (editor_opaque( c->editor ) && para_cell( para ))
     {
         /* Clear any space at the bottom of the cell after the text. */
         rc.top = c->pt.y + para->pt.y + para->nHeight;