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- // Copyright 2017 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/paint_info.h"
- #include "base/feature_list.h"
- #include "ui/views/views_features.h"
- namespace views {
- namespace {
- gfx::Rect GetSnappedRecordingBoundsInternal(
- const gfx::Rect& paint_recording_bounds,
- float device_scale_factor,
- const gfx::Size& parent_size,
- const gfx::Rect& child_bounds) {
- const gfx::Vector2d& child_origin = child_bounds.OffsetFromOrigin();
- int right = child_origin.x() + child_bounds.width();
- int bottom = child_origin.y() + child_bounds.height();
- int new_x = std::round(child_origin.x() * device_scale_factor);
- int new_y = std::round(child_origin.y() * device_scale_factor);
- int new_right;
- int new_bottom;
- bool empty = paint_recording_bounds.IsEmpty();
- if (right == parent_size.width() && !empty)
- new_right = paint_recording_bounds.width();
- else
- new_right = std::round(right * device_scale_factor);
- if (bottom == parent_size.height() && !empty)
- new_bottom = paint_recording_bounds.height();
- else
- new_bottom = std::round(bottom * device_scale_factor);
- return gfx::Rect(new_x + paint_recording_bounds.x(),
- new_y + paint_recording_bounds.y(), new_right - new_x,
- new_bottom - new_y);
- }
- // Layer's paint info should use the corner scaling logic to compute
- // the recording which is what Views uses to compte the view's
- // paint_recording_bounds_, with exception that a view touches the right/bottom
- // edges of the parent, and its layer has to be able to paint to these
- // edges. Such cases should be handled case by case basis.
- gfx::Rect GetViewsLayerRecordingBounds(const ui::PaintContext& context,
- const gfx::Rect& child_bounds) {
- if (!context.is_pixel_canvas())
- return gfx::Rect(child_bounds.size());
- return gfx::Rect(GetSnappedRecordingBoundsInternal(
- gfx::Rect(), context.device_scale_factor(),
- gfx::Size() /* not used */, child_bounds)
- .size());
- }
- } // namespace
- // static
- PaintInfo PaintInfo::CreateRootPaintInfo(const ui::PaintContext& root_context,
- const gfx::Size& size) {
- return PaintInfo(root_context, size);
- }
- // static
- PaintInfo PaintInfo::CreateChildPaintInfo(const PaintInfo& parent_paint_info,
- const gfx::Rect& bounds,
- const gfx::Size& parent_size,
- ScaleType scale_type,
- bool is_layer,
- bool needs_paint) {
- return PaintInfo(parent_paint_info, bounds, parent_size, scale_type, is_layer,
- needs_paint);
- }
- PaintInfo::~PaintInfo() = default;
- bool PaintInfo::IsPixelCanvas() const {
- return context().is_pixel_canvas();
- }
- bool PaintInfo::ShouldPaint() const {
- if (base::FeatureList::IsEnabled(features::kEnableViewPaintOptimization))
- return needs_paint_;
- return context().IsRectInvalid(gfx::Rect(paint_recording_size()));
- }
- PaintInfo::PaintInfo(const PaintInfo& other)
- : paint_recording_scale_x_(other.paint_recording_scale_x_),
- paint_recording_scale_y_(other.paint_recording_scale_y_),
- paint_recording_bounds_(other.paint_recording_bounds_),
- offset_from_parent_(other.offset_from_parent_),
- context_(other.context(), gfx::Vector2d()),
- root_context_(nullptr) {}
- // The root layer should use the ScaleToEnclosingRect, the same logic that
- // cc(chrome compositor) is using.
- PaintInfo::PaintInfo(const ui::PaintContext& root_context,
- const gfx::Size& size)
- : paint_recording_scale_x_(root_context.is_pixel_canvas()
- ? root_context.device_scale_factor()
- : 1.f),
- paint_recording_scale_y_(paint_recording_scale_x_),
- paint_recording_bounds_(
- gfx::ScaleToEnclosingRect(gfx::Rect(size), paint_recording_scale_x_)),
- context_(root_context, gfx::Vector2d()),
- root_context_(&root_context) {}
- PaintInfo::PaintInfo(const PaintInfo& parent_paint_info,
- const gfx::Rect& bounds,
- const gfx::Size& parent_size,
- ScaleType scale_type,
- bool is_layer,
- bool needs_paint)
- : paint_recording_scale_x_(1.f),
- paint_recording_scale_y_(1.f),
- paint_recording_bounds_(
- is_layer ? GetViewsLayerRecordingBounds(parent_paint_info.context(),
- bounds)
- : parent_paint_info.GetSnappedRecordingBounds(parent_size,
- bounds)),
- offset_from_parent_(
- paint_recording_bounds_.OffsetFromOrigin() -
- parent_paint_info.paint_recording_bounds_.OffsetFromOrigin()),
- context_(parent_paint_info.context(), offset_from_parent_),
- root_context_(nullptr),
- needs_paint_(needs_paint) {
- if (IsPixelCanvas()) {
- if (scale_type == ScaleType::kUniformScaling) {
- paint_recording_scale_x_ = paint_recording_scale_y_ =
- context().device_scale_factor();
- } else if (scale_type == ScaleType::kScaleWithEdgeSnapping) {
- if (bounds.size().width() > 0) {
- paint_recording_scale_x_ =
- static_cast<float>(paint_recording_bounds_.width()) /
- static_cast<float>(bounds.size().width());
- }
- if (bounds.size().height() > 0) {
- paint_recording_scale_y_ =
- static_cast<float>(paint_recording_bounds_.height()) /
- static_cast<float>(bounds.size().height());
- }
- }
- }
- }
- gfx::Rect PaintInfo::GetSnappedRecordingBounds(
- const gfx::Size& parent_size,
- const gfx::Rect& child_bounds) const {
- if (!IsPixelCanvas())
- return (child_bounds + paint_recording_bounds_.OffsetFromOrigin());
- return GetSnappedRecordingBoundsInternal(paint_recording_bounds_,
- context().device_scale_factor(),
- parent_size, child_bounds);
- }
- } // namespace views
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