cc: remove FontAtlas

cc/font_atlas.cc

-// 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 "skia/ext/refptr.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/effects/SkColorMatrixFilter.h"
-
-namespace {
-
-// The FontAtlas uses a bitmap with pre-rendered RED glyps to display text.
-// Therefore using SkPaint::setColor() has no effect on the font's color when text is drawn.
-// This helper class uses color filtering as a workaround to change the font's color.
-class ScopedFontColorFilter {
-public:
-    ScopedFontColorFilter()
-        : m_paint(0)
-    {
-    }
-
-    void init(SkPaint* paint, const SkColor& color)
-    {
-        if (color == SK_ColorRED)
-            return;
-
-        SkColorMatrix matrix;
-        memset(matrix.fMat, 0, sizeof(matrix.fMat));
-
-        // Set the matrix to transform the pre-rendered RED font into the provided color.
-        matrix.fMat[5 * 0] = SkColorGetR(color) / 255.0;
-        matrix.fMat[5 * 1] = SkColorGetG(color) / 255.0;
-        matrix.fMat[5 * 2] = SkColorGetB(color) / 255.0;
-        matrix.fMat[5 * 3 + 3] = SkColorGetA(color) / 255.0;
-
-        // SkPaint can only use one color filter, so the old one needs to be saved.
-        SkColorFilter* oldFilter = paint->getColorFilter();
-        if (oldFilter) {
-            // Increase the reference count, so the old filter is not released when it's replaced.
-            oldFilter->ref();
-
-            // Save the old filter for later restoring.
-            // Reference count will get decreased on destruction.
-            m_oldFilter = skia::AdoptRef(oldFilter);
-
-            // If the old filter had a color matrix, the new filter will use both.
-            SkColorMatrix oldMatrix;
-            if (oldFilter->asColorMatrix(oldMatrix.fMat))
-                matrix.setConcat(oldMatrix, matrix);
-        }
-
-        // Set the new color filter and replace the old one.
-        skia::RefPtr<SkColorMatrixFilter> filter = skia::AdoptRef(new SkColorMatrixFilter(matrix));
-        paint->setColorFilter(filter.get());
-
-        m_paint = paint;
-    }
-
-    ~ScopedFontColorFilter()
-    {
-        // Remove the color filter and restore the old one.
-        if (m_paint)
-            m_paint->setColorFilter(m_oldFilter.get());
-    }
-
-private:
-    SkPaint* m_paint;
-    skia::RefPtr<SkColorFilter> m_oldFilter;
-};
-
-}  // namespace
-
-namespace cc {
-
-FontAtlas::FontAtlas(SkBitmap bitmap, gfx::Rect asciiToRectTable[128], int fontHeight)
-    : m_atlas(bitmap)
-    , m_fontHeight(fontHeight)
-    , m_color(SK_ColorRED)
-{
-    for (size_t i = 0; i < 128; ++i)
-        m_asciiToRectTable[i] = asciiToRectTable[i];
-}
-
-FontAtlas::~FontAtlas()
-{
-}
-
-void FontAtlas::drawText(SkCanvas* canvas, SkPaint* paint, const std::string& text, const gfx::Point& destPosition, const gfx::Size& clip) const
-{
-    ScopedFontColorFilter filter;
-    filter.init(paint, m_color);
-
-    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