1 files changed, 80 insertions, 0 deletions
diff --git a/base/gfx/gdi_util.cc b/base/gfx/gdi_util.cc
new file mode 100644
index 0000000..48df853
--- /dev/null
+++ b/base/gfx/gdi_util.cc
@@ -0,0 +1,80 @@
+// Copyright (c) 2006-2008 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 "base/gfx/gdi_util.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);
+  hdr->bV4RedMask   = 0x00ff0000;
+  hdr->bV4GreenMask = 0x0000ff00;
+  hdr->bV4BlueMask  = 0x000000ff;
+  hdr->bV4AlphaMask = 0xff000000;
+}
+
+// Creates a monochrome bitmap header.
+void CreateMonochromeBitmapHeader(int width,
+                                  int height,
+                                  BITMAPINFOHEADER* hdr) {
+  hdr->biSize = sizeof(BITMAPINFOHEADER);
+  hdr->biWidth = width;
+  hdr->biHeight = -height;
+  hdr->biPlanes = 1;
+  hdr->biBitCount = 1;
+  hdr->biCompression = BI_RGB;
+  hdr->biSizeImage = 0;
+  hdr->biXPelsPerMeter = 1;
+  hdr->biYPelsPerMeter = 1;
+  hdr->biClrUsed = 0;
+  hdr->biClrImportant = 0;
+}
+
+void SubtractRectanglesFromRegion(HRGN hrgn,
+                                  const std::vector<gfx::Rect>& cutouts) {
+  if (cutouts.size()) {
+    HRGN cutout = ::CreateRectRgn(0, 0, 0, 0);
+    for (size_t i = 0; i < cutouts.size(); i++) {
+      ::SetRectRgn(cutout,
+                   cutouts[i].x(),
+                   cutouts[i].y(),
+                   cutouts[i].right(),
+                   cutouts[i].bottom());
+      ::CombineRgn(hrgn, hrgn, cutout, RGN_DIFF);
+    }
+    ::DeleteObject(cutout);
+  }
+}
+
+}  // namespace gfx
+