[CLOSED] Big patch.

ui/gfx/gdi_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/gdi_util.h"
 
+#include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace gfx {
 
 void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr) {
   CreateBitmapHeaderWithColorDepth(width, height, 32, hdr);
 }
 
 void CreateBitmapHeaderWithColorDepth(int width, int height, int color_depth,
                                       BITMAPINFOHEADER* hdr) {
   // These values are shared with gfx::PlatformDevice
   hdr->biSize = sizeof(BITMAPINFOHEADER);
   hdr->biWidth = width;
   hdr->biHeight = -height;  // minus means top-down bitmap
   hdr->biPlanes = 1;
   hdr->biBitCount = color_depth;
   hdr->biCompression = BI_RGB;  // no compression
   hdr->biSizeImage = 0;
   hdr->biXPelsPerMeter = 1;
   hdr->biYPelsPerMeter = 1;
   hdr->biClrUsed = 0;
   hdr->biClrImportant = 0;
 }
 
-
 void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr) {
   // Because bmp v4 header is just an extension, we just create a v3 header and
   // copy the bits over to the v4 header.
   BITMAPINFOHEADER header_v3;
   CreateBitmapHeader(width, height, &header_v3);
   memset(hdr, 0, sizeof(BITMAPV4HEADER));
   memcpy(hdr, &header_v3, sizeof(BITMAPINFOHEADER));
 
   // Correct the size of the header and fill in the mask values.
   hdr->bV4Size = sizeof(BITMAPV4HEADER);
@@ skipping 70 matching lines @@
 }
 
 // Apply scaling to the DC.
 bool ScaleDC(HDC dc, double scale_factor) {
   SetGraphicsMode(dc, GM_ADVANCED);
   XFORM xform = {0};
   xform.eM11 = xform.eM22 = scale_factor;
   return !!ModifyWorldTransform(dc, &xform, MWT_LEFTMULTIPLY);
 }
 
+void StretchDIBits(HDC hdc, int dest_x, int dest_y, int dest_w, int dest_h,
+                   int src_x, int src_y, int src_w, int src_h, void* pixels,
+                   const BITMAPINFO* bitmap_info) {
+  // When blitting a rectangle that touches the bottom, left corner of the
+  // bitmap, StretchDIBits looks at it top-down!  For more details, see
+  // http://wiki.allegro.cc/index.php?title=StretchDIBits.
+  int rv;
+  int bitmap_h = -bitmap_info->bmiHeader.biHeight;
+  int bottom_up_src_y = bitmap_h - src_y - src_h;
+  if (bottom_up_src_y == 0 && src_x == 0 && src_h != bitmap_h) {
+    rv = ::StretchDIBits(hdc,
+                         dest_x, dest_h + dest_y - 1, dest_w, -dest_h,
+                         src_x, bitmap_h - src_y + 1, src_w, -src_h,
+                         pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
+  } else {
+    rv = ::StretchDIBits(hdc,
+                         dest_x, dest_y, dest_w, dest_h,
+                         src_x, bottom_up_src_y, src_w, src_h,
+                         pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
+  }
+  DCHECK(rv != GDI_ERROR);
+}
+
 }  // namespace gfx