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// Copyright 2015 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/manifest/manifest_icon_selector.h"
#include <stddef.h>
#include <algorithm>
#include <cmath>
#include <limits>
#include "base/strings/utf_string_conversions.h"
#include "components/mime_util/mime_util.h"
#include "content/public/browser/web_contents.h"
#include "ui/gfx/screen.h"
using content::Manifest;
ManifestIconSelector::ManifestIconSelector(int ideal_icon_size_in_px,
int minimum_icon_size_in_px)
: ideal_icon_size_in_px_(ideal_icon_size_in_px),
minimum_icon_size_in_px_(minimum_icon_size_in_px),
density_(
gfx::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor()) {
}
bool ManifestIconSelector::IconSizesContainsPreferredSize(
const std::vector<gfx::Size>& sizes) {
for (size_t i = 0; i < sizes.size(); ++i) {
if (sizes[i].height() != sizes[i].width())
continue;
if (sizes[i].width() == ideal_icon_size_in_px_)
return true;
}
return false;
}
bool ManifestIconSelector::IconSizesContainsBiggerThanMinimumSize(
const std::vector<gfx::Size>& sizes) {
for (size_t i = 0; i < sizes.size(); ++i) {
if (sizes[i].height() != sizes[i].width())
continue;
if (sizes[i].width() >= minimum_icon_size_in_px_)
return true;
}
return false;
}
int ManifestIconSelector::FindBestMatchingIconForDensity(
const std::vector<content::Manifest::Icon>& icons,
float density) {
int best_index = -1;
int best_delta = std::numeric_limits<int>::min();
for (size_t i = 0; i < icons.size(); ++i) {
if (icons[i].density != density)
continue;
const std::vector<gfx::Size>& sizes = icons[i].sizes;
for (size_t j = 0; j < sizes.size(); ++j) {
if (sizes[j].height() != sizes[j].width())
continue;
int delta = sizes[j].width() - ideal_icon_size_in_px_;
if (delta == 0)
return i;
if (best_delta > 0 && delta < 0)
continue;
if ((best_delta > 0 && delta < best_delta) ||
(best_delta < 0 && delta > best_delta)) {
best_index = i;
best_delta = delta;
}
}
}
return best_index;
}
int ManifestIconSelector::FindBestMatchingIcon(
const std::vector<content::Manifest::Icon>& icons) {
int best_index = -1;
// The first pass is to find the ideal icon. That icon is of the right size
// with the default density or the device's density.
for (size_t i = 0; i < icons.size(); ++i) {
if (icons[i].density == density_ &&
IconSizesContainsPreferredSize(icons[i].sizes)) {
return i;
}
// If there is an icon with the right size but not the right density, keep
// it on the side and only use it if nothing better is found.
if (icons[i].density == Manifest::Icon::kDefaultDensity &&
IconSizesContainsPreferredSize(icons[i].sizes)) {
best_index = i;
}
}
if (best_index != -1)
return best_index;
// The second pass is to find an icon with 'any'. The current device scale
// factor is preferred. Otherwise, the default scale factor is used.
for (size_t i = 0; i < icons.size(); ++i) {
if (icons[i].density == density_ &&
IconSizesContainsAny(icons[i].sizes)) {
return i;
}
// If there is an icon with 'any' but not the right density, keep it on the
// side and only use it if nothing better is found.
if (icons[i].density == Manifest::Icon::kDefaultDensity &&
IconSizesContainsAny(icons[i].sizes)) {
best_index = i;
}
}
if (best_index != -1)
return best_index;
// The last pass will try to find the best suitable icon for the device's
// scale factor. If none, another pass will be run using kDefaultDensity.
best_index = FindBestMatchingIconForDensity(icons, density_);
if (best_index != -1 &&
IconSizesContainsBiggerThanMinimumSize(icons[best_index].sizes))
return best_index;
best_index = FindBestMatchingIconForDensity(icons,
Manifest::Icon::kDefaultDensity);
if (best_index != -1 &&
IconSizesContainsBiggerThanMinimumSize(icons[best_index].sizes))
return best_index;
return -1;
}
// static
bool ManifestIconSelector::IconSizesContainsAny(
const std::vector<gfx::Size>& sizes) {
for (size_t i = 0; i < sizes.size(); ++i) {
if (sizes[i].IsEmpty())
return true;
}
return false;
}
// static
std::vector<Manifest::Icon> ManifestIconSelector::FilterIconsByType(
const std::vector<content::Manifest::Icon>& icons) {
std::vector<Manifest::Icon> result;
for (size_t i = 0; i < icons.size(); ++i) {
if (icons[i].type.is_null() ||
mime_util::IsSupportedImageMimeType(
base::UTF16ToUTF8(icons[i].type.string()))) {
result.push_back(icons[i]);
}
}
return result;
}
// static
GURL ManifestIconSelector::FindBestMatchingIcon(
const std::vector<Manifest::Icon>& unfiltered_icons,
const int ideal_icon_size_in_dp,
const int minimum_icon_size_in_dp) {
DCHECK(minimum_icon_size_in_dp <= ideal_icon_size_in_dp);
const int ideal_icon_size_in_px =
ConvertIconSizeFromDpToPx(ideal_icon_size_in_dp);
const int minimum_icon_size_in_px =
ConvertIconSizeFromDpToPx(minimum_icon_size_in_dp);
std::vector<Manifest::Icon> icons =
ManifestIconSelector::FilterIconsByType(unfiltered_icons);
ManifestIconSelector selector(ideal_icon_size_in_px,
minimum_icon_size_in_px);
int index = selector.FindBestMatchingIcon(icons);
if (index == -1)
return GURL();
return icons[index].src;
}
// static
int ManifestIconSelector::ConvertIconSizeFromDpToPx(int icon_size_in_dp) {
return static_cast<int>(round(
icon_size_in_dp *
gfx::Screen::GetScreen()->GetPrimaryDisplay().device_scale_factor()));
}
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