mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
15a638332c
Previously, we tried to use the render tree's paint offset to move the text to the proper position, but that appears to snap to integer logical pixels, introducing jitter. Now we use the SkCanvas's matrix to position the text, removing the jitter. Fixes https://github.com/flutter/flutter/issues/234
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// Copyright 2015 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 "sky/engine/core/text/ParagraphBuilder.h"
|
|
|
|
#include "sky/engine/core/rendering/PaintInfo.h"
|
|
#include "sky/engine/core/rendering/style/RenderStyle.h"
|
|
#include "sky/engine/platform/fonts/FontCache.h"
|
|
#include "sky/engine/platform/graphics/GraphicsContext.h"
|
|
|
|
namespace blink {
|
|
|
|
Paragraph::Paragraph(PassOwnPtr<RenderView> renderView)
|
|
: m_renderView(renderView)
|
|
{
|
|
}
|
|
|
|
Paragraph::~Paragraph()
|
|
{
|
|
}
|
|
|
|
double Paragraph::width()
|
|
{
|
|
return firstChildBox()->width();
|
|
}
|
|
|
|
double Paragraph::height()
|
|
{
|
|
return firstChildBox()->height();
|
|
}
|
|
|
|
double Paragraph::minIntrinsicWidth()
|
|
{
|
|
return firstChildBox()->minPreferredLogicalWidth();
|
|
}
|
|
|
|
double Paragraph::maxIntrinsicWidth()
|
|
{
|
|
return firstChildBox()->maxPreferredLogicalWidth();
|
|
}
|
|
|
|
double Paragraph::alphabeticBaseline()
|
|
{
|
|
return firstChildBox()->firstLineBoxBaseline(FontBaselineOrAuto(AlphabeticBaseline));
|
|
}
|
|
|
|
double Paragraph::ideographicBaseline()
|
|
{
|
|
return firstChildBox()->firstLineBoxBaseline(FontBaselineOrAuto(IdeographicBaseline));
|
|
}
|
|
|
|
void Paragraph::layout()
|
|
{
|
|
FontCachePurgePreventer fontCachePurgePreventer;
|
|
|
|
LayoutUnit maxWidth = std::max(m_minWidth, m_maxWidth);
|
|
LayoutUnit maxHeight = std::max(m_minHeight, m_maxHeight);
|
|
m_renderView->setFrameViewSize(IntSize(maxWidth, maxHeight));
|
|
m_renderView->layout();
|
|
}
|
|
|
|
void Paragraph::paint(Canvas* canvas, const Offset& offset)
|
|
{
|
|
FontCachePurgePreventer fontCachePurgePreventer;
|
|
|
|
// Very simplified painting to allow painting an arbitrary (layer-less) subtree.
|
|
RenderBox* box = firstChildBox();
|
|
SkCanvas* skCanvas = canvas->skCanvas();
|
|
skCanvas->translate(offset.sk_size.width(), offset.sk_size.height());
|
|
|
|
GraphicsContext context(skCanvas);
|
|
Vector<RenderBox*> layers;
|
|
LayoutRect bounds = box->absoluteBoundingBoxRect();
|
|
DCHECK(bounds.x() == 0 && bounds.y() == 0);
|
|
PaintInfo paintInfo(&context, enclosingIntRect(bounds), box);
|
|
box->paint(paintInfo, LayoutPoint(), layers);
|
|
// Note we're ignoring any layers encountered.
|
|
// TODO(abarth): Remove the concept of RenderLayers.
|
|
|
|
skCanvas->translate(-offset.sk_size.width(), -offset.sk_size.height());
|
|
}
|
|
|
|
} // namespace blink
|