blob: 2e9c4062526f1654e191e8d9f9dc22d479703fd5 [file] [log] [blame]
// 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/logging.h"
#include "cc/paint/paint_flags.h"
#include "skia/ext/image_operations.h"
#include "ui/gfx/canvas.h"
namespace views {
namespace {
// Returns the pixels for the bitmap in |image| at scale |image_scale|.
void* GetBitmapPixels(const gfx::ImageSkia& img, float image_scale) {
DCHECK_NE(0.0f, image_scale);
return img.GetRepresentation(image_scale).GetBitmap().getPixels();
}
} // namespace
// static
const char ImageView::kViewClassName[] = "ImageView";
ImageView::ImageView() = default;
ImageView::~ImageView() = default;
void ImageView::SetImage(const gfx::ImageSkia& img) {
if (IsImageEqual(img))
return;
last_painted_bitmap_pixels_ = nullptr;
gfx::Size pref_size(GetPreferredSize());
image_ = img;
scaled_image_ = gfx::ImageSkia();
if (pref_size != GetPreferredSize())
PreferredSizeChanged();
SchedulePaint();
}
void ImageView::SetImage(const gfx::ImageSkia* image_skia) {
if (image_skia) {
SetImage(*image_skia);
} else {
gfx::ImageSkia t;
SetImage(t);
}
}
const gfx::ImageSkia& ImageView::GetImage() const {
return image_;
}
bool ImageView::IsImageEqual(const gfx::ImageSkia& img) const {
// Even though we copy ImageSkia in SetImage() the backing store
// (ImageSkiaStorage) is not copied and 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 backing store but also the pixels of the last image we painted.
return image_.BackedBySameObjectAs(img) &&
last_paint_scale_ != 0.0f &&
last_painted_bitmap_pixels_ == GetBitmapPixels(img, last_paint_scale_);
}
gfx::Size ImageView::GetImageSize() const {
return image_size_.value_or(image_.size());
}
void ImageView::OnPaint(gfx::Canvas* canvas) {
View::OnPaint(canvas);
OnPaintImage(canvas);
}
const char* ImageView::GetClassName() const {
return kViewClassName;
}
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_.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));
return scaled_image_;
}
} // namespace views