/* * Copyright (C) 2012 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef CCFontAtlas_h #define CCFontAtlas_h #if USE(ACCELERATED_COMPOSITING) #include "ImageBuffer.h" #include <wtf/OwnPtr.h> #include <wtf/PassOwnPtr.h> #include <wtf/text/WTFString.h> namespace WebCore { class Color; class FontDescription; class IntPoint; class IntRect; class GraphicsContext; // This class provides basic ability to draw text onto the heads-up display. // It must be initialized on the main thread, and it can only draw text on the impl thread. class CCFontAtlas { WTF_MAKE_NONCOPYABLE(CCFontAtlas); public: static PassOwnPtr<CCFontAtlas> create() { return adoptPtr(new CCFontAtlas()); } // Creates the font atlas. // - Should only be called on the main thread. void initialize(); // Draws multiple lines of text where each line of text is separated by '\n'. // - Correct glyphs will be drawn for ASCII codes in the range 32-127; any characters // outside that range will be displayed as a default rectangle glyph. // - IntSize clip is used to avoid wasting time drawing things that are outside the // target canvas bounds. // - Should only be called only on the impl thread. void drawText(GraphicsContext*, const String& text, const IntPoint& destPosition, const IntSize& clip) const; // Draws the entire atlas at the specified position, just for debugging purposes. void drawDebugAtlas(GraphicsContext*, const IntPoint& destPosition) const; private: CCFontAtlas(); // Paints the font into the atlas, from left-to-right, top-to-bottom, starting at // startingPosition. At the same time, it updates the ascii-to-IntRect mapping for // each character. By doing things this way, it is possible to support variable-width // fonts and multiple fonts on the same atlas. void generateAtlasForFont(GraphicsContext*, const FontDescription&, const Color& fontColor, const IntPoint& startingPosition, IntRect asciiToAtlasTable[128]); void drawOneLineOfTextInternal(GraphicsContext*, const String&, const IntPoint& destPosition) const; // The actual texture atlas containing all the pre-rendered glyphs. OwnPtr<ImageBuffer> m_atlas; // The look-up tables mapping ascii characters to their IntRect locations on the atlas. IntRect m_asciiToRectTable[128]; int m_fontHeight; }; } // namespace WebCore #endif // USE(ACCELERATED_COMPOSITING) #endif