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// 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 "chrome/browser/ui/views/theme_helpers.h"
#include <atlbase.h>
#include <atlapp.h>
#include <atltheme.h>
#include "base/logging.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/size.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::Canvas canvas(gfx::Size(width, 1), ui::SCALE_FACTOR_100P, 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()) {
skia::ScopedPlatformPaint scoped_platform_paint(canvas.sk_canvas());
HDC dc = scoped_platform_paint.GetPlatformSurface();
RECT rect = { 0, 0, width, 1 };
theme.DrawThemeBackground(dc, 0, 0, &rect, NULL);
} 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.sk_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.
SkDevice* device = skia::GetTopDevice(*canvas.sk_canvas());
const SkBitmap& bitmap = device->accessBitmap(false);
SkAutoLockPixels lock(bitmap);
*c1 = 0xFF000000 | bitmap.getColor(x1, 0);
*c2 = 0xFF000000 | bitmap.getColor(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));
}
}
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