1/*
2 *  Copyright (C) 2010 Igalia S.L.
3 *
4 *  This library is free software; you can redistribute it and/or
5 *  modify it under the terms of the GNU Lesser General Public
6 *  License as published by the Free Software Foundation; either
7 *  version 2 of the License, or (at your option) any later version.
8 *
9 *  This library is distributed in the hope that it will be useful,
10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 *  Lesser General Public License for more details.
13 *
14 *  You should have received a copy of the GNU Lesser General Public
15 *  License along with this library; if not, write to the Free Software
16 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18
19
20#include "config.h"
21#include "ImageBuffer.h"
22
23#include "Base64.h"
24#include "GdkCairoUtilities.h"
25#include "GOwnPtr.h"
26#include "GRefPtrGtk.h"
27#include "MIMETypeRegistry.h"
28#include <cairo.h>
29#include <gtk/gtk.h>
30#include <wtf/text/CString.h>
31#include <wtf/text/StringConcatenate.h>
32
33namespace WebCore {
34
35String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
36{
37    ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
38
39    if (!mimeType.startsWith("image/"))
40        return "data:,";
41
42    // List of supported image types comes from the GdkPixbuf documentation.
43    // http://library.gnome.org/devel/gdk-pixbuf/stable/gdk-pixbuf-file-saving.html#gdk-pixbuf-save-to-bufferv
44    String type = mimeType.substring(sizeof "image");
45    if (type != "jpeg" && type != "png" && type != "tiff" && type != "ico" && type != "bmp")
46        return "data:,";
47
48    GRefPtr<GdkPixbuf> pixbuf = cairoImageSurfaceToGdkPixbuf(m_data.m_surface);
49    if (!pixbuf)
50        return "data:,";
51
52    GOwnPtr<gchar> buffer(0);
53    gsize bufferSize;
54    GError* error = 0;
55    gboolean success = FALSE;
56    if (type == "jpeg" && quality && *quality >= 0.0 && *quality <= 1.0) {
57        String qualityString = String::format("%f", *quality * 100.0);
58        success = gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize,
59            type.utf8().data(), &error, "quality", qualityString.utf8().data(), NULL);
60    } else {
61        success = gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error, NULL);
62    }
63
64    if (!success)
65        return "data:,";
66
67    Vector<char> out;
68    base64Encode(reinterpret_cast<const char*>(buffer.get()), bufferSize, out);
69
70    return makeString("data:", mimeType, ";base64,", out);
71}
72
73}
74