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 "CCProxy.h"
  11 #include "SkCanvas.h"
  12
  13 namespace WebCore {
  14
  15 using namespace std;
  16
  17 CCFontAtlas::CCFontAtlas(SkBitmap bitmap, IntRect asciiToRectTable[128], int fontHeight)
  18     : m_atlas(bitmap)
  19     , m_fontHeight(fontHeight)
  20 {
  21     for (size_t i = 0; i < 128; ++i)
  22         m_asciiToRectTable[i] = asciiToRectTable[i];
  23 }
  24
  25 CCFontAtlas::~CCFontAtlas()
  26 {
  27 }
  28
  29 void CCFontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const String& text, const IntPoint& destPosition, const IntSize& clip) const
  30 {
  31     ASSERT(CCProxy::isImplThread());
  32
  33     Vector<String> lines;
  34     text.split('\n', lines);
  35
  36     IntPoint position = destPosition;
  37     for (size_t i = 0; i < lines.size(); ++i) {
  38         drawOneLineOfTextInternal(canvas, paint, lines[i], position);
  39         position.setY(position.y() + m_fontHeight);
  40         if (position.y() > clip.height())
  41             return;
  42     }
  43 }
  44
  45 void CCFontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint, const String& textLine, const IntPoint& destPosition) const
  46 {
  47     ASSERT(CCProxy::isImplThread());
  48
  49     IntPoint position = destPosition;
  50     for (unsigned i = 0; i < textLine.length(); ++i) {
  51         // If the ASCII code is out of bounds, then index 0 is used, which is just a plain rectangle glyph.
  52         int asciiIndex = (textLine[i] < 128) ? textLine[i] : 0;
  53         IntRect glyphBounds = m_asciiToRectTable[asciiIndex];
  54         SkIRect source = SkIRect::MakeXYWH(glyphBounds.x(), glyphBounds.y(), glyphBounds.width(), glyphBounds.height());
  55         canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(position.x(), position.y(), glyphBounds.width(), glyphBounds.height()), &paint);
  56         position.setX(position.x() + glyphBounds.width());
  57     }
  58 }
  59
  60 void CCFontAtlas::drawDebugAtlas(SkCanvas* canvas, const IntPoint& destPosition) const
  61 {
  62     ASSERT(CCProxy::isImplThread());
  63
  64     SkIRect source = SkIRect::MakeWH(m_atlas.width(), m_atlas.height());
  65     canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(destPosition.x(), destPosition.y(), m_atlas.width(), m_atlas.height()));
  66 }
  67
  68 } // namespace WebCore
  69
  70 #endif // USE(ACCELERATED_COMPOSITING)