Consolidate Windows bitmap and DC code

skia/ext/skia_utils_win.cc

 // 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 "skia/ext/skia_utils_win.h"
 
 #include <stddef.h>
 #include <windows.h>
 
+#include "base/debug/gdi_debug_util_win.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkTypes.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
 
 namespace {
 
 static_assert(offsetof(RECT, left) == offsetof(SkIRect, fLeft), "o1");
 static_assert(offsetof(RECT, top) == offsetof(SkIRect, fTop), "o2");
 static_assert(offsetof(RECT, right) == offsetof(SkIRect, fRight), "o3");
 static_assert(offsetof(RECT, bottom) == offsetof(SkIRect, fBottom), "o4");
 static_assert(sizeof(RECT().left) == sizeof(SkIRect().fLeft), "o5");
 static_assert(sizeof(RECT().top) == sizeof(SkIRect().fTop), "o6");
 static_assert(sizeof(RECT().right) == sizeof(SkIRect().fRight), "o7");
@@ skipping 118 matching lines @@
                   source,
                   src_rect.left,
                   src_rect.top,
                   copy_width,
                   copy_height,
                   blend_function);
   }
   LoadTransformToDC(source, transform);
 }
 
+HBITMAP CreateHBitmap(int width, int height, bool is_opaque,
+                      HANDLE shared_section, void** data) {
+  // CreateDIBSection appears to get unhappy if we create an empty bitmap, so
+  // just create a minimal bitmap
+  if ((width == 0) || (height == 0)) {
+    width = 1;
+    height = 1;
+  }
+
+  BITMAPINFOHEADER hdr = {0};
+  hdr.biSize = sizeof(BITMAPINFOHEADER);
+  hdr.biWidth = width;
+  hdr.biHeight = -height;  // minus means top-down bitmap
+  hdr.biPlanes = 1;
+  hdr.biBitCount = 32;
+  hdr.biCompression = BI_RGB;  // no compression
+  hdr.biSizeImage = 0;
+  hdr.biXPelsPerMeter = 1;
+  hdr.biYPelsPerMeter = 1;
+  hdr.biClrUsed = 0;
+  hdr.biClrImportant = 0;
+
+  HBITMAP hbitmap = CreateDIBSection(NULL, reinterpret_cast<BITMAPINFO*>(&hdr),
+                                     0, data, shared_section, 0);
+
+#if !defined(_WIN64)
+  // If this call fails, we're gonna crash hard. Try to get some useful
+  // information out before we crash for post-mortem analysis.
+  if (!hbitmap)
+    base::debug::GDIBitmapAllocFailure(&hdr, shared_section);
+#endif
+
+  return hbitmap;
+}
+
 }  // namespace skia