cc/CCFontAtlas.cpp

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6
   7 #if USE(ACCELERATED_COMPOSITING)
   8 #include "CCFontAtlas.h"
   9
  10 #include "base/string_split.h"
  11 #include "CCProxy.h"
  12 #include "SkCanvas.h"
  13 #include <vector>
  14
  15 namespace WebCore {
  16
  17 using namespace std;
  18
  19 CCFontAtlas::CCFontAtlas(SkBitmap bitmap, IntRect asciiToRectTable[128], int fontHeight)
  20     : m_atlas(bitmap)
  21     , m_fontHeight(fontHeight)
  22 {
  23     for (size_t i = 0; i < 128; ++i)
  24         m_asciiToRectTable[i] = asciiToRectTable[i];
  25 }
  26
  27 CCFontAtlas::~CCFontAtlas()
  28 {
  29 }
  30
  31 void CCFontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::string& text, const IntPoint& destPosition, const IntSize& clip) const
  32 {
  33     ASSERT(CCProxy::isImplThread());
  34
  35     std::vector<std::string> lines;
  36     base::SplitString(text, '\n', &lines);
  37
  38     IntPoint position = destPosition;
  39     for (size_t i = 0; i < lines.size(); ++i) {
  40         drawOneLineOfTextInternal(canvas, paint, lines[i], position);
  41         position.setY(position.y() + m_fontHeight);
  42         if (position.y() > clip.height())
  43             return;
  44     }
  45 }
  46
  47 void CCFontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint, const std::string& textLine, const IntPoint& destPosition) const
  48 {
  49     ASSERT(CCProxy::isImplThread());
  50
  51     IntPoint position = destPosition;
  52     for (unsigned i = 0; i < textLine.length(); ++i) {
  53         // If the ASCII code is out of bounds, then index 0 is used, which is just a plain rectangle glyph.
  54         int asciiIndex = (textLine[i] < 128) ? textLine[i] : 0;
  55         IntRect glyphBounds = m_asciiToRectTable[asciiIndex];
  56         SkIRect source = SkIRect::MakeXYWH(glyphBounds.x(), glyphBounds.y(), glyphBounds.width(), glyphBounds.height());
  57         canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(position.x(), position.y(), glyphBounds.width(), glyphBounds.height()), &paint);
  58         position.setX(position.x() + glyphBounds.width());
  59     }
  60 }
  61
  62 void CCFontAtlas::drawDebugAtlas(SkCanvas* canvas, const IntPoint& destPosition) const
  63 {
  64     ASSERT(CCProxy::isImplThread());
  65
  66     SkIRect source = SkIRect::MakeWH(m_atlas.width(), m_atlas.height());
  67     canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(destPosition.x(), destPosition.y(), m_atlas.width(), m_atlas.height()));
  68 }
  69
  70 } // namespace WebCore
  71
  72 #endif // USE(ACCELERATED_COMPOSITING)