[PATCH v6 4/6] dlls/sane.ds: Fill TW_IMAGEMEMXFER.YOffset in SANE_ImageMemXferGet

[Bernd Herd]

From: Bernd Herd

Many applications need YOffset to make the mandatory
Buffered Memory transfer work.
---
 dlls/sane.ds/ds_image.c | 4 +++-
 dlls/sane.ds/sane_i.h   | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/dlls/sane.ds/ds_image.c b/dlls/sane.ds/ds_image.c
index a5e68f1ba44..a1e7d91553b 100644
--- a/dlls/sane.ds/ds_image.c
+++ b/dlls/sane.ds/ds_image.c
@@ -75,6 +75,7 @@ TW_UINT16 SANE_Start(void)
             activeDS.frame_params.last_frame);

activeDS.currentState = 7;
+      activeDS.YOffset = 0;
   }
   return twRC;
 }
@@ -304,8 +305,9 @@ TW_UINT16 SANE_ImageMemXferGet (pTW_IDENTITY pOrigin,
             pImageMemXfer->Columns = activeDS.frame_params.pixels_per_line;
             pImageMemXfer->Rows = rows;
             pImageMemXfer->XOffset = 0;
-            pImageMemXfer->YOffset = 0;
+            pImageMemXfer->YOffset = activeDS.YOffset;
             pImageMemXfer->BytesWritten = retlen;
+            activeDS.YOffset += rows;

ScanningDialogBox(activeDS.progressWnd, retlen);

diff --git a/dlls/sane.ds/sane_i.h b/dlls/sane.ds/sane_i.h
index b92ac8a7023..205c35f78b0 100644
--- a/dlls/sane.ds/sane_i.h
+++ b/dlls/sane.ds/sane_i.h
@@ -53,6 +53,9 @@ struct tagActiveDS
     BOOL                YResolutionSet;
     TW_FIX32            defaultYResolution;

+    /* Number of scan lines already transfered in DG_IMAGE / DAT_IMAGEMEMXFER / MSG_GET. */
+    TW_UINT32           YOffset;
+
     /* Remaining number of images to transfer or -1 for unlimited */
     TW_INT16            remainingImages;