1 files changed, 92 insertions, 0 deletions
diff --git a/chrome/browser/ui/views/theme_helpers.cc b/chrome/browser/ui/views/theme_helpers.cc
new file mode 100644
index 0000000..41f6db5
--- /dev/null
+++ b/chrome/browser/ui/views/theme_helpers.cc
@@ -0,0 +1,92 @@
+// 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 "chrome/browser/views/theme_helpers.h"
+
+#include <atlbase.h>
+#include <atlapp.h>
+#include <atltheme.h>
+
+#include "base/logging.h"
+#include "gfx/canvas_skia.h"
+#include "skia/ext/bitmap_platform_device_win.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
+
+void GetRebarGradientColors(int width, int x1, int x2,
+                            SkColor* c1, SkColor* c2) {
+  DCHECK(c1 && c2) <<
+      "ThemeHelpers::GetRebarGradientColors - c1 or c2 is NULL!";
+
+  // To get the colors we need, we draw a horizontal gradient using
+  // DrawThemeBackground, then extract the pixel values from and return
+  // those so calling code can use them to create gradient brushes for use in
+  // rendering in other directions.
+
+  gfx::CanvasSkia canvas(width, 1, true);
+
+  // Render the Rebar gradient into the DIB
+  CTheme theme;
+  if (theme.IsThemingSupported())
+    theme.OpenThemeData(NULL, L"REBAR");
+  // On Windows XP+, if using a Theme, we can ask the theme to render the
+  // gradient for us.
+  if (!theme.IsThemeNull()) {
+    HDC dc = canvas.beginPlatformPaint();
+    RECT rect = { 0, 0, width, 1 };
+    theme.DrawThemeBackground(dc, 0, 0, &rect, NULL);
+    canvas.endPlatformPaint();
+  } else {
+    // On Windows 2000 or Windows XP+ with the Classic theme selected, we need
+    // to build our own gradient using system colors.
+    SkColor grad_colors[2];
+    COLORREF hl_ref = ::GetSysColor(COLOR_3DHILIGHT);
+    grad_colors[0] = SkColorSetRGB(GetRValue(hl_ref), GetGValue(hl_ref),
+                                   GetBValue(hl_ref));
+    COLORREF face_ref = ::GetSysColor(COLOR_3DFACE);
+    grad_colors[1] = SkColorSetRGB(GetRValue(face_ref), GetGValue(face_ref),
+                                   GetBValue(face_ref));
+    SkPoint grad_points[2];
+    grad_points[0].set(SkIntToScalar(0), SkIntToScalar(0));
+    grad_points[1].set(SkIntToScalar(width), SkIntToScalar(0));
+    SkShader* gradient_shader = SkGradientShader::CreateLinear(
+        grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode);
+    SkPaint paint;
+    paint.setShader(gradient_shader);
+    // Shader created with a ref count of 1, release as the paint now owns
+    // the gradient.
+    gradient_shader->unref();
+    paint.setStyle(SkPaint::kFill_Style);
+    canvas.drawRectCoords(SkIntToScalar(0), SkIntToScalar(0),
+                          SkIntToScalar(width), SkIntToScalar(1), paint);
+  }
+
+  // Extract the color values from the selected pixels
+  // The | in the following operations forces the alpha to 0xFF. This is
+  // needed as windows sets the alpha to 0 when it renders.
+  skia::BitmapPlatformDevice& device =
+      static_cast<skia::BitmapPlatformDevice&>(
+          canvas.getTopPlatformDevice());
+  *c1 = 0xFF000000 | device.getColorAt(x1, 0);
+  *c2 = 0xFF000000 | device.getColorAt(x2, 0);
+}
+
+void GetDarkLineColor(SkColor* dark_color) {
+  DCHECK(dark_color) << "ThemeHelpers::DarkColor - dark_color is NULL!";
+
+  CTheme theme;
+  if (theme.IsThemingSupported())
+    theme.OpenThemeData(NULL, L"REBAR");
+
+  // Note: the alpha values were chosen scientifically according to what looked
+  //       best to me at the time! --beng
+  if (!theme.IsThemeNull()) {
+    *dark_color = SkColorSetARGB(60, 0, 0, 0);
+  } else {
+    COLORREF shadow_ref = ::GetSysColor(COLOR_3DSHADOW);
+    *dark_color = SkColorSetARGB(175,
+                                 GetRValue(shadow_ref),
+                                 GetGValue(shadow_ref),
+                                 GetBValue(shadow_ref));
+  }
+}