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
15 namespace {
16
PaintThemeBackground(gfx::Canvas * canvas,SkBitmap * ntp_background,int tiling,int alignment,const gfx::Rect & area,int tab_contents_height)17 void 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
PaintBackgroundDetachedMode(ui::ThemeProvider * tp,gfx::Canvas * canvas,const gfx::Rect & area,int tab_contents_height)59 void 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