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// Copyright 2017 The Chromium Authors
// 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) {
return PaintInfo(parent_paint_info, bounds, parent_size, scale_type,
is_layer);
}
PaintInfo::~PaintInfo() = default;
bool PaintInfo::IsPixelCanvas() const {
return context().is_pixel_canvas();
}
bool PaintInfo::ShouldPaint() const {
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)
: 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) {
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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