Implementation of gdi32.GdiTransparentBlt and msimg32.TransparentBlt.

dlls/gdi/gdi32.spec

@@ -167,6 +167,7 @@
 @ stub GdiSetAttrs
 @ stdcall GdiSetBatchLimit(long)
 @ stub GdiSetServerAttr
+@ stdcall GdiTransparentBlt(long long long long long long long long long long long)
 @ stub GdiWinWatchClose
 @ stub GdiWinWatchDidStatusChange
 @ stub GdiWinWatchGetClipList

dlls/msimg32/Makefile.in

@@ -3,7 +3,7 @@ TOPOBJDIR = ../..
 SRCDIR    = @srcdir@
 VPATH     = @srcdir@
 MODULE    = msimg32.dll
-IMPORTS   = kernel32
+IMPORTS   = gdi32 kernel32
 
 C_SRCS = msimg32_main.c
 

dlls/msimg32/msimg32.spec

 @ stdcall AlphaBlend(long long long long long long long long long long long)
 @ stub DllInitialize
 @ stdcall GradientFill(long ptr long ptr long long) gdi32.GdiGradientFill
-@ stdcall TransparentBlt(long long long long long long long long long long long)
+@ stdcall TransparentBlt(long long long long long long long long long long long) gdi32.GdiTransparentBlt
 @ stdcall vSetDdrawflag()

dlls/msimg32/msimg32_main.c

@@ -38,20 +38,6 @@ BOOL WINAPI AlphaBlend( HDC hdcDest, int xDest, int yDest, int widthDest, int he
     return FALSE;
 }
 
-
-/******************************************************************************
- *           TransparentBlt   (MSIMG32.@)
- */
-BOOL WINAPI TransparentBlt( HDC hdcDest, int xDest, int yDest, int widthDest, int heightDst,
-                            HDC hdcSrc, int xSrc, int ySrc, int widthSrc, int heightSrc,
-                            UINT crTransparent )
-{
-    FIXME("stub: TransparentBlt from %p to %p\n", hdcSrc, hdcDest );
-    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-    return FALSE;
-}
-
-
 /******************************************************************************
  *           vSetDdrawflag   (MSIMG32.@)
  */

graphics/bitblt.c

@@ -309,6 +309,92 @@ BOOL WINAPI MaskBlt(HDC hdcDest, INT nXDest, INT nYDest,
     return TRUE;
 }
 
+/******************************************************************************
+ *           GdiTransparentBlt [GDI32.@]
+ */
+BOOL WINAPI GdiTransparentBlt( HDC hdcDest, int xDest, int yDest, int widthDest, int heightDest,
+                            HDC hdcSrc, int xSrc, int ySrc, int widthSrc, int heightSrc,
+                            UINT crTransparent )
+{
+    BOOL ret = FALSE;
+    HDC hdcWork;
+    HBITMAP bmpWork;
+    HGDIOBJ oldWork;
+    HDC hdcMask = NULL;
+    HBITMAP bmpMask = NULL;
+    HBITMAP oldMask = NULL;
+    COLORREF oldBackground;
+    COLORREF oldForeground;
+    int oldStretchMode;
+
+    if(widthDest < 0 || heightDest < 0 || widthSrc < 0 || heightSrc < 0) {
+        TRACE("Can not mirror\n");
+        return FALSE;
+    }
+
+    oldBackground = SetBkColor(hdcDest, RGB(255,255,255));
+    oldForeground = SetTextColor(hdcDest, RGB(0,0,0));
+
+    /* Stretch bitmap */
+    oldStretchMode = GetStretchBltMode(hdcSrc);
+    if(oldStretchMode == BLACKONWHITE || oldStretchMode == WHITEONBLACK)
+        SetStretchBltMode(hdcSrc, COLORONCOLOR);
+    hdcWork = CreateCompatibleDC(hdcDest);
+    bmpWork = CreateCompatibleBitmap(hdcDest, widthDest, heightDest);
+    oldWork = SelectObject(hdcWork, bmpWork);
+    if(!StretchBlt(hdcWork, 0, 0, widthDest, heightDest, hdcSrc, xSrc, ySrc, widthSrc, heightSrc, SRCCOPY)) {
+        TRACE("Failed to stretch\n");
+        goto error;
+    }
+    SetBkColor(hdcWork, crTransparent);
+
+    /* Create mask */
+    hdcMask = CreateCompatibleDC(hdcDest);
+    bmpMask = CreateCompatibleBitmap(hdcMask, widthDest, heightDest);
+    oldMask = SelectObject(hdcMask, bmpMask);
+    if(!BitBlt(hdcMask, 0, 0, widthDest, heightDest, hdcWork, 0, 0, SRCCOPY)) {
+        TRACE("Failed to create mask\n");
+        goto error;
+    }
+
+    /* Replace transparent color with black */
+    SetBkColor(hdcWork, RGB(0,0,0));
+    SetTextColor(hdcWork, RGB(255,255,255));
+    if(!BitBlt(hdcWork, 0, 0, widthDest, heightDest, hdcMask, 0, 0, SRCAND)) {
+        TRACE("Failed to mask out background\n");
+        goto error;
+    }
+
+    /* Replace non-transparent area on destination with black */
+    if(!BitBlt(hdcDest, 0, 0, widthDest, heightDest, hdcMask, 0, 0, SRCAND)) {
+        TRACE("Failed to clear destination area\n");
+        goto error;
+    }
+
+    /* Draw the image */
+    if(!BitBlt(hdcDest, xDest, yDest, widthDest, heightDest, hdcWork, 0, 0, SRCPAINT)) {
+        TRACE("Failed to paint image\n");
+        goto error;
+    }
+
+    ret = TRUE;
+error:
+    SetStretchBltMode(hdcSrc, oldStretchMode);
+    SetBkColor(hdcDest, oldBackground);
+    SetTextColor(hdcDest, oldForeground);
+    if(hdcWork) {
+        SelectObject(hdcWork, oldWork);
+        DeleteDC(hdcWork);
+    }
+    if(bmpWork) DeleteObject(bmpWork);
+    if(hdcMask) {
+        SelectObject(hdcMask, oldMask);
+        DeleteDC(hdcMask);
+    }
+    if(bmpMask) DeleteObject(bmpMask);
+    return ret;
+}
+
 /*********************************************************************
  *      PlgBlt [GDI32.@]
  *