1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/ntp_background_util.h"
6
7#include "base/logging.h"
8#include "chrome/browser/themes/theme_service.h"
9#include "grit/theme_resources.h"
10#include "third_party/skia/include/core/SkBitmap.h"
11#include "ui/gfx/canvas.h"
12#include "ui/gfx/rect.h"
13#include "ui/gfx/skia_util.h"
14
15namespace {
16
17void PaintThemeBackground(
18    gfx::Canvas* canvas, SkBitmap* ntp_background, int tiling, int alignment,
19    const gfx::Rect& area, int tab_contents_height) {
20  int x_pos = 0;
21  int y_pos = 0;
22  int width = area.width() + ntp_background->width();
23  int height = area.height() + ntp_background->height();
24
25  if (alignment & ThemeService::ALIGN_BOTTOM)
26    y_pos += area.height() + tab_contents_height - ntp_background->height();
27
28  if (alignment & ThemeService::ALIGN_RIGHT) {
29    x_pos += area.width() - ntp_background->width();
30  } else if (alignment & ThemeService::ALIGN_LEFT) {
31    // no op
32  } else {  // ALIGN_CENTER
33    x_pos += area.width() / 2 - ntp_background->width() / 2;
34  }
35
36  if (tiling != ThemeService::REPEAT &&
37      tiling != ThemeService::REPEAT_X) {
38    width = ntp_background->width();
39  } else if (x_pos > 0) {
40    x_pos = x_pos % ntp_background->width() - ntp_background->width();
41  }
42
43  if (tiling != ThemeService::REPEAT &&
44      tiling != ThemeService::REPEAT_Y) {
45    height = ntp_background->height();
46  } else if (y_pos > 0) {
47    y_pos = y_pos % ntp_background->height() - ntp_background->height();
48  }
49
50  x_pos += area.x();
51  y_pos += area.y();
52
53  canvas->TileImageInt(*ntp_background, x_pos, y_pos, width, height);
54}
55
56}  // namespace
57
58// static
59void NtpBackgroundUtil::PaintBackgroundDetachedMode(
60    ui::ThemeProvider* tp, gfx::Canvas* canvas, const gfx::Rect& area,
61    int tab_contents_height) {
62  // Draw the background to match the new tab page.
63  canvas->FillRectInt(tp->GetColor(ThemeService::COLOR_NTP_BACKGROUND),
64                      area.x(), area.y(), area.width(), area.height());
65
66  if (tp->HasCustomImage(IDR_THEME_NTP_BACKGROUND)) {
67    int tiling = ThemeService::NO_REPEAT;
68    tp->GetDisplayProperty(ThemeService::NTP_BACKGROUND_TILING,
69                           &tiling);
70    int alignment;
71    if (tp->GetDisplayProperty(ThemeService::NTP_BACKGROUND_ALIGNMENT,
72        &alignment)) {
73      SkBitmap* ntp_background = tp->GetBitmapNamed(IDR_THEME_NTP_BACKGROUND);
74
75      PaintThemeBackground(
76          canvas, ntp_background, tiling, alignment, area, tab_contents_height);
77    }
78  }
79}
80