[WPE] Build getUserMedia support
[WebKit-https.git] / Source / WebCore / platform / graphics / gtk / ImageBufferGtk.cpp
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 #include "config.h"
20 #include "ImageBuffer.h"
21
22 #include "CairoUtilities.h"
23 #include "GRefPtrGtk.h"
24 #include "GdkCairoUtilities.h"
25 #include "MIMETypeRegistry.h"
26 #include <cairo.h>
27 #include <gtk/gtk.h>
28 #include <wtf/glib/GUniquePtr.h>
29 #include <wtf/text/Base64.h>
30 #include <wtf/text/CString.h>
31 #include <wtf/text/WTFString.h>
32
33 namespace WebCore {
34
35 static bool encodeImage(cairo_surface_t* surface, const String& mimeType, std::optional<double> quality, GUniqueOutPtr<gchar>& buffer, gsize& bufferSize)
36 {
37     // List of supported image encoding types comes from the GdkPixbuf documentation.
38     // http://developer.gnome.org/gdk-pixbuf/stable/gdk-pixbuf-File-saving.html#gdk-pixbuf-save-to-bufferv
39
40     String type = mimeType.substring(sizeof "image");
41     if (type != "jpeg" && type != "png" && type != "tiff" && type != "ico" && type != "bmp")
42         return false;
43
44     GRefPtr<GdkPixbuf> pixbuf;
45     if (type == "jpeg") {
46         // JPEG doesn't support alpha channel. The <canvas> spec states that toDataURL() must encode a Porter-Duff
47         // composite source-over black for image types that do not support alpha.
48         RefPtr<cairo_surface_t> newSurface;
49         if (cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE) {
50             newSurface = adoptRef(cairo_image_surface_create_for_data(cairo_image_surface_get_data(surface),
51                 CAIRO_FORMAT_RGB24,
52                 cairo_image_surface_get_width(surface),
53                 cairo_image_surface_get_height(surface),
54                 cairo_image_surface_get_stride(surface)));
55         } else {
56             IntSize size = cairoSurfaceSize(surface);
57             newSurface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_RGB24, size.width(), size.height()));
58             RefPtr<cairo_t> cr = adoptRef(cairo_create(newSurface.get()));
59             cairo_set_source_surface(cr.get(), surface, 0, 0);
60             cairo_paint(cr.get());
61         }
62         pixbuf = adoptGRef(cairoSurfaceToGdkPixbuf(newSurface.get()));
63     } else
64         pixbuf = adoptGRef(cairoSurfaceToGdkPixbuf(surface));
65     if (!pixbuf)
66         return false;
67
68     GUniqueOutPtr<GError> error;
69     if (type == "jpeg" && quality && *quality >= 0.0 && *quality <= 1.0) {
70         String qualityString = String::format("%d", static_cast<int>(*quality * 100.0 + 0.5));
71         gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error.outPtr(), "quality", qualityString.utf8().data(), NULL);
72     } else
73         gdk_pixbuf_save_to_buffer(pixbuf.get(), &buffer.outPtr(), &bufferSize, type.utf8().data(), &error.outPtr(), NULL);
74
75     return !error;
76 }
77
78 String ImageBuffer::toDataURL(const String& mimeType, std::optional<double> quality, PreserveResolution) const
79 {
80     Vector<uint8_t> imageData = toData(mimeType, quality);
81     if (imageData.isEmpty())
82         return "data:,";
83
84     Vector<char> base64Data;
85     base64Encode(imageData.data(), imageData.size(), base64Data);
86
87     return "data:" + mimeType + ";base64," + base64Data;
88 }
89
90 Vector<uint8_t> ImageBuffer::toData(const String& mimeType, std::optional<double> quality) const
91 {
92     ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
93
94     GUniqueOutPtr<gchar> buffer;
95     gsize bufferSize;
96     if (!encodeImage(m_data.m_surface.get(), mimeType, quality, buffer, bufferSize))
97         return { };
98
99     Vector<uint8_t> imageData;
100     imageData.append(buffer.get(), bufferSize);
101     return imageData;
102 }
103
104 }