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// Copyright 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 "cc/font_atlas.h"
#include <vector>
#include "base/string_split.h"
#include "third_party/skia/include/core/SkCanvas.h"
namespace cc {
FontAtlas::FontAtlas(SkBitmap bitmap, gfx::Rect asciiToRectTable[128], int fontHeight)
: m_atlas(bitmap)
, m_fontHeight(fontHeight)
{
for (size_t i = 0; i < 128; ++i)
m_asciiToRectTable[i] = asciiToRectTable[i];
}
FontAtlas::~FontAtlas()
{
}
void FontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::string& text, const gfx::Point& destPosition, const gfx::Size& clip) const
{
std::vector<std::string> lines;
base::SplitString(text, '\n', &lines);
gfx::Point position = destPosition;
for (size_t i = 0; i < lines.size(); ++i) {
drawOneLineOfTextInternal(canvas, paint, lines[i], position);
position.set_y(position.y() + m_fontHeight);
if (position.y() > clip.height())
return;
}
}
void FontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint, const std::string& textLine, const gfx::Point& destPosition) const
{
gfx::Point position = destPosition;
for (unsigned i = 0; i < textLine.length(); ++i) {
// If the ASCII code is out of bounds, then index 0 is used, which is just a plain rectangle glyph.
unsigned asciiIndex = textLine[i];
if (asciiIndex >= 128)
asciiIndex = 0;
gfx::Rect glyphBounds = m_asciiToRectTable[asciiIndex];
SkIRect source = SkIRect::MakeXYWH(glyphBounds.x(), glyphBounds.y(), glyphBounds.width(), glyphBounds.height());
canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(position.x(), position.y(), glyphBounds.width(), glyphBounds.height()), &paint);
position.set_x(position.x() + glyphBounds.width());
}
}
gfx::Size FontAtlas::textSize(const std::string& text)
{
int maxWidth = 0;
std::vector<std::string> lines;
base::SplitString(text, '\n', &lines);
for (size_t i = 0; i < lines.size(); ++i) {
int lineWidth = 0;
for (size_t j = 0; j < lines[i].size(); ++j) {
unsigned asciiIndex = lines[i][j];
if (asciiIndex >= 128)
asciiIndex = 0;
lineWidth += m_asciiToRectTable[asciiIndex].width();
}
if (lineWidth > maxWidth)
maxWidth = lineWidth;
}
return gfx::Size(maxWidth, m_fontHeight * lines.size());
}
void FontAtlas::drawDebugAtlas(SkCanvas* canvas, const gfx::Point& destPosition) const
{
SkIRect source = SkIRect::MakeWH(m_atlas.width(), m_atlas.height());
canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(destPosition.x(), destPosition.y(), m_atlas.width(), m_atlas.height()));
}
} // namespace cc
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