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image_view.cc
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image_view.cc
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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 "ui/views/controls/image_view.h"
#include <utility>
#include "base/check_op.h"
#include "base/i18n/rtl.h"
#include "base/numerics/safe_conversions.h"
#include "cc/paint/paint_flags.h"
#include "skia/ext/image_operations.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/paint_vector_icon.h"
#include "ui/native_theme/themed_vector_icon.h"
#include "ui/views/image_model_utils.h"
namespace views {
namespace {
// Returns the pixels for the bitmap in |image| at scale |image_scale|.
void* GetBitmapPixels(const gfx::ImageSkia& image, float image_scale) {
DCHECK_NE(0.0f, image_scale);
return image.GetRepresentation(image_scale).GetBitmap().getPixels();
}
} // namespace
ImageView::ImageView() = default;
ImageView::ImageView(const ui::ImageModel& image_model) {
SetImage(image_model);
}
ImageView::~ImageView() = default;
void ImageView::SetImage(const ui::ImageModel& image_model) {
if (IsImageEqual(image_model))
return;
const gfx::Size pref_size = GetPreferredSize();
image_model_ = image_model;
scaled_image_ = gfx::ImageSkia();
if (pref_size != GetPreferredSize())
PreferredSizeChanged();
SchedulePaint();
}
void ImageView::SetImageSize(const gfx::Size& image_size) {
image_size_ = image_size;
PreferredSizeChanged();
}
void ImageView::ResetImageSize() {
image_size_.reset();
PreferredSizeChanged();
}
gfx::Rect ImageView::GetImageBounds() const {
return gfx::Rect(image_origin_, GetImageSize());
}
gfx::ImageSkia ImageView::GetImage() const {
return views::GetImageSkiaFromImageModel(image_model_, GetNativeTheme());
}
ui::ImageModel ImageView::GetImageModel() const {
return image_model_;
}
void ImageView::SetHorizontalAlignment(Alignment alignment) {
if (alignment != horizontal_alignment_) {
horizontal_alignment_ = alignment;
UpdateImageOrigin();
OnPropertyChanged(&horizontal_alignment_, kPropertyEffectsPaint);
}
}
ImageView::Alignment ImageView::GetHorizontalAlignment() const {
return horizontal_alignment_;
}
void ImageView::SetVerticalAlignment(Alignment alignment) {
if (alignment != vertical_alignment_) {
vertical_alignment_ = alignment;
UpdateImageOrigin();
OnPropertyChanged(&horizontal_alignment_, kPropertyEffectsPaint);
}
}
ImageView::Alignment ImageView::GetVerticalAlignment() const {
return vertical_alignment_;
}
void ImageView::SetAccessibleName(const std::u16string& accessible_name) {
if (accessible_name_ == accessible_name)
return;
accessible_name_ = accessible_name;
OnPropertyChanged(&accessible_name_, kPropertyEffectsNone);
NotifyAccessibilityEvent(ax::mojom::Event::kTextChanged, true);
}
const std::u16string& ImageView::GetAccessibleName() const {
return accessible_name_.empty() ? tooltip_text_ : accessible_name_;
}
void ImageView::SetTooltipText(const std::u16string& tooltip) {
tooltip_text_ = tooltip;
}
const std::u16string& ImageView::GetTooltipText() const {
return tooltip_text_;
}
bool ImageView::IsImageEqual(const ui::ImageModel& image_model) const {
if (image_model != image_model_)
return false;
// It's not feasible to run the old and new generators and compare output
// here, so for safety, simply assume the new generator's output differs.
if (image_model.IsImageGenerator())
return false;
if (!image_model.IsImage())
return true;
// An ImageModel's Image holds a handle to a backing store, which may have
// changed since the last call to SetImage(). The expectation is that
// SetImage() with different pixels is treated as though the image changed.
// For this reason we compare not only the Image but also the pixels we last
// painted.
return last_paint_scale_ != 0.0f &&
last_painted_bitmap_pixels_ ==
GetBitmapPixels(image_model.GetImage().AsImageSkia(),
last_paint_scale_);
}
void ImageView::UpdateImageOrigin() {
gfx::Size image_size = GetImageSize();
gfx::Insets insets = GetInsets();
int x = 0;
// In order to properly handle alignment of images in RTL locales, we need
// to flip the meaning of trailing and leading. For example, if the
// horizontal alignment is set to trailing, then we'll use left alignment for
// the image instead of right alignment if the UI layout is RTL.
Alignment actual_horizontal_alignment = horizontal_alignment_;
if (base::i18n::IsRTL() && (horizontal_alignment_ != Alignment::kCenter)) {
actual_horizontal_alignment = (horizontal_alignment_ == Alignment::kLeading)
? Alignment::kTrailing
: Alignment::kLeading;
}
switch (actual_horizontal_alignment) {
case Alignment::kLeading:
x = insets.left();
break;
case Alignment::kTrailing:
x = width() - insets.right() - image_size.width();
break;
case Alignment::kCenter:
x = (width() - insets.width() - image_size.width()) / 2 + insets.left();
break;
}
int y = 0;
switch (vertical_alignment_) {
case Alignment::kLeading:
y = insets.top();
break;
case Alignment::kTrailing:
y = height() - insets.bottom() - image_size.height();
break;
case Alignment::kCenter:
y = (height() - insets.height() - image_size.height()) / 2 + insets.top();
break;
}
image_origin_ = gfx::Point(x, y);
}
gfx::Size ImageView::GetImageSize() const {
return image_size_.value_or(image_model_.Size());
}
void ImageView::OnPaint(gfx::Canvas* canvas) {
View::OnPaint(canvas);
OnPaintImage(canvas);
}
void ImageView::GetAccessibleNodeData(ui::AXNodeData* node_data) {
const std::u16string& name = GetAccessibleName();
if (name.empty()) {
node_data->role = ax::mojom::Role::kNone;
return;
}
node_data->role = ax::mojom::Role::kImage;
node_data->SetName(name);
}
std::u16string ImageView::GetTooltipText(const gfx::Point& p) const {
return tooltip_text_;
}
gfx::Size ImageView::CalculatePreferredSize() const {
gfx::Size size = GetImageSize();
size.Enlarge(GetInsets().width(), GetInsets().height());
return size;
}
views::PaintInfo::ScaleType ImageView::GetPaintScaleType() const {
// ImageViewBase contains an image which is rastered at the device scale
// factor. By default, the paint commands are recorded at a scale factor
// slightly different from the device scale factor. Re-rastering the image at
// this paint recording scale will result in a distorted image. Paint
// recording scale might also not be uniform along the x & y axis, thus
// resulting in further distortion in the aspect ratio of the final image.
// |kUniformScaling| ensures that the paint recording scale is uniform along
// the x & y axis and keeps the scale equal to the device scale factor.
// See http://crbug.com/754010 for more details.
return views::PaintInfo::ScaleType::kUniformScaling;
}
void ImageView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
UpdateImageOrigin();
}
void ImageView::PreferredSizeChanged() {
View::PreferredSizeChanged();
UpdateImageOrigin();
}
void ImageView::OnThemeChanged() {
View::OnThemeChanged();
if (image_model_.IsImageGenerator() ||
(image_model_.IsVectorIcon() &&
!image_model_.GetVectorIcon().has_color())) {
scaled_image_ = gfx::ImageSkia();
SchedulePaint();
}
}
void ImageView::OnPaintImage(gfx::Canvas* canvas) {
last_paint_scale_ = canvas->image_scale();
last_painted_bitmap_pixels_ = nullptr;
gfx::ImageSkia image = GetPaintImage(last_paint_scale_);
if (image.isNull())
return;
gfx::Rect image_bounds(GetImageBounds());
if (image_bounds.IsEmpty())
return;
if (image_bounds.size() != gfx::Size(image.width(), image.height())) {
// Resize case
cc::PaintFlags flags;
flags.setFilterQuality(kLow_SkFilterQuality);
canvas->DrawImageInt(image, 0, 0, image.width(), image.height(),
image_bounds.x(), image_bounds.y(),
image_bounds.width(), image_bounds.height(), true,
flags);
} else {
canvas->DrawImageInt(image, image_bounds.x(), image_bounds.y());
}
last_painted_bitmap_pixels_ = GetBitmapPixels(image, last_paint_scale_);
}
gfx::ImageSkia ImageView::GetPaintImage(float scale) {
if (image_model_.IsEmpty())
return gfx::ImageSkia();
if (image_model_.IsImage() || image_model_.IsImageGenerator()) {
const gfx::ImageSkia image =
views::GetImageSkiaFromImageModel(image_model_, GetNativeTheme());
if (image.isNull())
return image;
const gfx::ImageSkiaRep& rep = image.GetRepresentation(scale);
if (rep.scale() == scale)
return image;
if (scaled_image_.HasRepresentation(scale))
return scaled_image_;
// Only caches one image rep for the current scale.
scaled_image_ = gfx::ImageSkia();
gfx::Size scaled_size =
gfx::ScaleToCeiledSize(rep.pixel_size(), scale / rep.scale());
scaled_image_.AddRepresentation(gfx::ImageSkiaRep(
skia::ImageOperations::Resize(
rep.GetBitmap(), skia::ImageOperations::RESIZE_BEST,
scaled_size.width(), scaled_size.height()),
scale));
} else if (scaled_image_.isNull()) {
scaled_image_ =
views::GetImageSkiaFromImageModel(image_model_, GetNativeTheme());
}
return scaled_image_;
}
BEGIN_METADATA(ImageView, View)
ADD_PROPERTY_METADATA(Alignment, HorizontalAlignment)
ADD_PROPERTY_METADATA(Alignment, VerticalAlignment)
ADD_PROPERTY_METADATA(std::u16string, AccessibleName)
ADD_PROPERTY_METADATA(std::u16string, TooltipText)
END_METADATA
} // namespace views
DEFINE_ENUM_CONVERTERS(views::ImageView::Alignment,
{views::ImageView::Alignment::kLeading, u"kLeading"},
{views::ImageView::Alignment::kCenter, u"kCenter"},
{views::ImageView::Alignment::kTrailing, u"kTrailing"})