1/*
2 * Copyright (C) 2010,2017 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 "DragImage.h"
21
22#include "Element.h"
23#include "Image.h"
24#include "TextFlags.h"
25#include "TextIndicator.h"
26#include <cairo.h>
27#include <gdk/gdk.h>
28#include <wtf/URL.h>
29
30namespace WebCore {
31
32IntSize dragImageSize(DragImageRef image)
33{
34 if (image)
35 return { cairo_image_surface_get_width(image.get()), cairo_image_surface_get_height(image.get()) };
36
37 return { 0, 0 };
38}
39
40void deleteDragImage(DragImageRef)
41{
42 // Since this is a RefPtr, there's nothing additional we need to do to
43 // delete it. It will be released when it falls out of scope.
44}
45
46DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
47{
48 if (!image)
49 return nullptr;
50
51 IntSize imageSize = dragImageSize(image);
52 IntSize scaledSize(imageSize);
53 scaledSize.scale(scale.width(), scale.height());
54 if (imageSize == scaledSize)
55 return image;
56
57 RefPtr<cairo_surface_t> scaledSurface = adoptRef(cairo_surface_create_similar(image.get(), CAIRO_CONTENT_COLOR_ALPHA, scaledSize.width(), scaledSize.height()));
58
59 RefPtr<cairo_t> context = adoptRef(cairo_create(scaledSurface.get()));
60 cairo_scale(context.get(), scale.width(), scale.height());
61 cairo_pattern_set_extend(cairo_get_source(context.get()), CAIRO_EXTEND_PAD);
62 cairo_pattern_set_filter(cairo_get_source(context.get()), CAIRO_FILTER_BEST);
63 cairo_set_operator(context.get(), CAIRO_OPERATOR_SOURCE);
64 cairo_set_source_surface(context.get(), image.get(), 0, 0);
65 cairo_paint(context.get());
66
67 return scaledSurface;
68}
69
70DragImageRef dissolveDragImageToFraction(DragImageRef image, float fraction)
71{
72 if (!image)
73 return nullptr;
74
75 if (!gdk_screen_is_composited(gdk_screen_get_default()))
76 return image;
77
78 RefPtr<cairo_t> context = adoptRef(cairo_create(image.get()));
79 cairo_set_operator(context.get(), CAIRO_OPERATOR_DEST_IN);
80 cairo_set_source_rgba(context.get(), 0, 0, 0, fraction);
81 cairo_paint(context.get());
82 return image;
83}
84
85DragImageRef createDragImageFromImage(Image* image, ImageOrientationDescription)
86{
87 return image->nativeImageForCurrentFrame();
88}
89
90DragImageRef createDragImageIconForCachedImageFilename(const String&)
91{
92 return nullptr;
93}
94
95DragImageRef createDragImageForLink(Element&, URL&, const String&, TextIndicatorData&, FontRenderingMode, float)
96{
97 return nullptr;
98}
99
100DragImageRef createDragImageForColor(const Color&, const FloatRect&, float, Path&)
101{
102 return nullptr;
103}
104
105}
106