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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/ntp_background_util.h"
#include "base/logging.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/search/search.h"
#include "chrome/browser/ui/search/search_ui.h"
#include "grit/theme_resources.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/safe_integer_conversions.h"
#include "ui/gfx/skia_util.h"
namespace {
int Round(float value) {
return gfx::ToRoundedInt(value + 0.5);
}
void PaintThemeBackground(
gfx::Canvas* canvas,
gfx::ImageSkia* ntp_background,
int tiling,
int alignment,
const gfx::Rect& area_in_canvas,
int tab_contents_height,
const gfx::Size& browser_client_area_size,
const gfx::Point& area_origin_in_browser_client_area) {
int x_pos = 0;
int y_pos = 0;
int width = area_in_canvas.width() + ntp_background->width();
int height = area_in_canvas.height() + ntp_background->height();
if (alignment & ThemeService::ALIGN_BOTTOM) {
y_pos += area_in_canvas.height() + tab_contents_height -
ntp_background->height();
} else if (alignment & ThemeService::ALIGN_TOP) {
// no op
} else { // ALIGN_CENTER
// If there is no |browser_client_area_size|, the theme image only fills up
// |tab_contents_height|, else it fills up |browser_client_area_size|.
if (browser_client_area_size.IsEmpty()) {
y_pos += Round(area_in_canvas.height() + tab_contents_height / 2.0 -
ntp_background->height() / 2.0);
} else {
y_pos += NtpBackgroundUtil::GetPlacementOfCenterAlignedImage(
browser_client_area_size.height(), ntp_background->height());
y_pos -= area_origin_in_browser_client_area.y();
}
}
// Use |browser_client_area_size| for width if it's available, else use
// |area_in_canvas|'s.
int width_to_use = browser_client_area_size.IsEmpty() ?
area_in_canvas.width() : browser_client_area_size.width();
if (alignment & ThemeService::ALIGN_RIGHT) {
x_pos += width_to_use - ntp_background->width();
} else if (alignment & ThemeService::ALIGN_LEFT) {
// no op
} else { // ALIGN_CENTER
x_pos += NtpBackgroundUtil::GetPlacementOfCenterAlignedImage(
width_to_use, ntp_background->width());
x_pos -= area_origin_in_browser_client_area.x();
}
if (tiling != ThemeService::REPEAT &&
tiling != ThemeService::REPEAT_X) {
width = ntp_background->width();
} else if (x_pos > 0) {
x_pos = x_pos % ntp_background->width() - ntp_background->width();
}
if (tiling != ThemeService::REPEAT &&
tiling != ThemeService::REPEAT_Y) {
height = ntp_background->height();
} else if (y_pos > 0) {
y_pos = y_pos % ntp_background->height() - ntp_background->height();
}
x_pos += area_in_canvas.x();
y_pos += area_in_canvas.y();
// If |x_pos| and/or |y_pos| is/are negative, and/or |width| and/or |height|
// is/are bigger than size of |area_in_canvas|, the image could be painted
// outside of |area_in_canvas| in |canvas|. To make sure we only paint into
// |area_in_canvas|, clip the area.
canvas->Save();
canvas->ClipRect(area_in_canvas);
canvas->TileImageInt(*ntp_background, x_pos, y_pos, width, height);
canvas->Restore();
}
void PaintBackground(Profile* profile,
gfx::Canvas* canvas,
const gfx::Rect& area_in_canvas,
int tab_contents_height,
const gfx::Size& browser_client_area_size,
const gfx::Point& area_origin_in_browser_client_area) {
// Draw the background to match the new tab page.
canvas->FillRect(area_in_canvas,
chrome::search::GetNTPBackgroundColor(profile));
const ui::ThemeProvider* tp = ThemeServiceFactory::GetForProfile(profile);
if (tp->HasCustomImage(IDR_THEME_NTP_BACKGROUND)) {
int tiling = ThemeService::NO_REPEAT;
tp->GetDisplayProperty(ThemeService::NTP_BACKGROUND_TILING, &tiling);
int alignment;
if (tp->GetDisplayProperty(ThemeService::NTP_BACKGROUND_ALIGNMENT,
&alignment)) {
gfx::ImageSkia* ntp_background =
tp->GetImageSkiaNamed(IDR_THEME_NTP_BACKGROUND);
PaintThemeBackground(
canvas, ntp_background, tiling, alignment, area_in_canvas,
tab_contents_height, browser_client_area_size,
area_origin_in_browser_client_area);
}
}
}
} // namespace
// static
void NtpBackgroundUtil::PaintBackgroundDetachedMode(
Profile* profile,
gfx::Canvas* canvas,
const gfx::Rect& area,
int tab_contents_height) {
PaintBackground(profile, canvas, area, tab_contents_height, gfx::Size(),
gfx::Point());
}
// static
void NtpBackgroundUtil::PaintBackgroundForBrowserClientArea(
Profile* profile,
gfx::Canvas* canvas,
const gfx::Rect& area_in_canvas,
const gfx::Size& browser_client_area_size,
const gfx::Rect& area_in_browser_client_area) {
PaintBackground(profile, canvas, area_in_canvas,
browser_client_area_size.height() -
area_in_browser_client_area.bottom(),
browser_client_area_size,
area_in_browser_client_area.origin());
}
// static
int NtpBackgroundUtil::GetPlacementOfCenterAlignedImage(int view_dimension,
int image_dimension) {
return Round(view_dimension / 2.0 - image_dimension / 2.0);
}
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