| // 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 |