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
33 namespace WebCore {
34
toDataURL(const String & mimeType,const double * quality) const35 String 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