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Viewing changes to Source/WebCore/platform/graphics/gtk/ImageBufferGtk.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/WebCore/platform/graphics/gtk/ImageBufferGtk.cpp
 
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/*
 
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 *  Copyright (C) 2010 Igalia S.L.
 
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 *
 
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 *  This library is free software; you can redistribute it and/or
 
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 *  modify it under the terms of the GNU Lesser General Public
 
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 *  License as published by the Free Software Foundation; either
 
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 *  version 2 of the License, or (at your option) any later version.
 
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 *
 
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 *  This library is distributed in the hope that it will be useful,
 
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 
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 *  Lesser General Public License for more details.
 
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 *
 
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 *  You should have received a copy of the GNU Lesser General Public
 
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 *  License along with this library; if not, write to the Free Software
 
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 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
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 */
 
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#include "config.h"
 
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#include "ImageBuffer.h"
 
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#include "GdkCairoUtilities.h"
 
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#include <wtf/gobject/GOwnPtr.h>
 
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#include "GRefPtrGtk.h"
 
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#include "MIMETypeRegistry.h"
 
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#include <cairo.h>
 
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#include <gtk/gtk.h>
 
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#include <wtf/text/Base64.h>
 
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#include <wtf/text/CString.h>
 
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#include <wtf/text/WTFString.h>
 
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namespace WebCore {
 
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static bool encodeImage(cairo_surface_t* surface, const String& mimeType, const double* quality, GOwnPtr<gchar>& buffer, gsize& bufferSize)
 
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{
 
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    // List of supported image encoding types comes from the GdkPixbuf documentation.
 
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    // http://developer.gnome.org/gdk-pixbuf/stable/gdk-pixbuf-File-saving.html#gdk-pixbuf-save-to-bufferv
 
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    String type = mimeType.substring(sizeof "image");
 
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    if (type != "jpeg" && type != "png" && type != "tiff" && type != "ico" && type != "bmp")
 
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        return false;
 
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    GRefPtr<GdkPixbuf> pixbuf;
 
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    if (type == "jpeg") {
 
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        // JPEG doesn't support alpha channel. The <canvas> spec states that toDataURL() must encode a Porter-Duff
 
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        // composite source-over black for image types that do not support alpha.
 
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        RefPtr<cairo_surface_t> newSurface = adoptRef(cairo_image_surface_create_for_data(cairo_image_surface_get_data(surface),
 
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                                                                                          CAIRO_FORMAT_RGB24,
 
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                                                                                          cairo_image_surface_get_width(surface),
 
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                                                                                          cairo_image_surface_get_height(surface),
 
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                                                                                          cairo_image_surface_get_stride(surface)));
 
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        pixbuf = adoptGRef(cairoImageSurfaceToGdkPixbuf(newSurface.get()));
 
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    } else
 
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        pixbuf = adoptGRef(cairoImageSurfaceToGdkPixbuf(surface));
 
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    if (!pixbuf)
 
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        return false;
 
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    GError* error = 0;
 
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    if (type == "jpeg" && quality && *quality >= 0.0 && *quality <= 1.0) {
 
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        String qualityString = String::format("%d", static_cast<int>(*quality * 100.0 + 0.5));
 
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        gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error, "quality", qualityString.utf8().data(), NULL);
 
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    } else
 
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        gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error, NULL);
 
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    return !error;
 
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}
 
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String ImageBuffer::toDataURL(const String& mimeType, const double* quality, CoordinateSystem) const
 
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{
 
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    ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
 
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    GOwnPtr<gchar> buffer(0);
 
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    gsize bufferSize;
 
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    if (!encodeImage(m_data.m_surface, mimeType, quality, buffer, bufferSize))
 
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        return "data:,";
 
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    Vector<char> base64Data;
 
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    base64Encode(buffer.get(), bufferSize, base64Data);
 
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    return "data:" + mimeType + ";base64," + base64Data;
 
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}
 
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}