gdi32: Fixes GetDIBits for top-down destination bitmaps (Bug #26236).

[John Edmonds]

Resolves Bug #26236.
---
 dlls/gdi32/dib.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/dlls/gdi32/dib.c b/dlls/gdi32/dib.c
index eae7f35..0abd833 100644
--- a/dlls/gdi32/dib.c
+++ b/dlls/gdi32/dib.c
@@ -874,7 +874,7 @@ INT WINAPI GetDIBits(
            unsigned int srcwidth = bmp->dib->dsBm.bmWidth;
            int srcwidthb = bmp->dib->dsBm.bmWidthBytes;
            unsigned int dstwidth = width;
-            unsigned int dstwidthb = DIB_GetDIBWidthBytes( width, bpp );
+            int dstwidthb = DIB_GetDIBWidthBytes( width, bpp );
            LPBYTE dbits = bits, sbits = (LPBYTE)
bmp->dib->dsBm.bmBits + (startscan * srcwidthb);
            unsigned int x, y, width, widthb;

@@ -888,6 +888,12 @@ INT WINAPI GetDIBits(
                sbits += (srcwidthb *
(int)(abs(bmp->dib->dsBmih.biHeight) - 2 * startscan - 1));
                srcwidthb = -srcwidthb;
            }
+            /*Same for the destination.*/
+            if (height < 0)
+            {
+                dbits = (LPBYTE)bits + (dstwidthb * (lines - 1));
+                dstwidthb = -dstwidthb;
+            }
            switch( bpp ) {

           case 15:
@@ -902,7 +908,7 @@ INT WINAPI GetDIBits(

                    case 16: /* 16 bpp srcDIB -> 16 bpp dstDIB */
                        {
-                            widthb = min(abs(srcwidthb), dstwidthb);
+                            widthb = min(abs(srcwidthb), abs(dstwidthb));
                            /* FIXME: BI_BITFIELDS not supported yet */
                            for (y = 0; y < lines; y++,
dbits+=dstwidthb, sbits+=srcwidthb)
                                memcpy(dbits, sbits, widthb);
@@ -980,7 +986,7 @@ INT WINAPI GetDIBits(

                    case 24: /* 24 bpp srcDIB -> 24 bpp dstDIB */
                        {
-                            widthb = min(abs(srcwidthb), dstwidthb);
+                            widthb = min(abs(srcwidthb), abs(dstwidthb));
                            for (y = 0; y < lines; y++,
dbits+=dstwidthb, sbits+=srcwidthb)
                                memcpy(dbits, sbits, widthb);
                        }
@@ -1056,7 +1062,7 @@ INT WINAPI GetDIBits(

                    case 32: /* 32 bpp srcDIB -> 32 bpp dstDIB */
                        {
-                            widthb = min(abs(srcwidthb), dstwidthb);
+                            widthb = min(abs(srcwidthb), abs(dstwidthb));
                            /* FIXME: BI_BITFIELDS not supported yet */
                            for (y = 0; y < lines; y++,
dbits+=dstwidthb, sbits+=srcwidthb) {
                                memcpy(dbits, sbits, widthb);
--
1.7.1