1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/base/cursor/cursor_util.h"
6
7 #include "base/logging.h"
8 #include "skia/ext/image_operations.h"
9 #include "ui/base/resource/resource_bundle.h"
10 #include "ui/gfx/image/image_skia.h"
11 #include "ui/gfx/point_conversions.h"
12 #include "ui/gfx/size_conversions.h"
13 #include "ui/gfx/skbitmap_operations.h"
14 #include "ui/gfx/skia_util.h"
15
16 namespace ui {
17
ScaleAndRotateCursorBitmapAndHotpoint(float scale,gfx::Display::Rotation rotation,SkBitmap * bitmap,gfx::Point * hotpoint)18 void ScaleAndRotateCursorBitmapAndHotpoint(float scale,
19 gfx::Display::Rotation rotation,
20 SkBitmap* bitmap,
21 gfx::Point* hotpoint) {
22 switch (rotation) {
23 case gfx::Display::ROTATE_0:
24 break;
25 case gfx::Display::ROTATE_90:
26 hotpoint->SetPoint(bitmap->height() - hotpoint->y(), hotpoint->x());
27 *bitmap = SkBitmapOperations::Rotate(
28 *bitmap, SkBitmapOperations::ROTATION_90_CW);
29 break;
30 case gfx::Display::ROTATE_180:
31 hotpoint->SetPoint(
32 bitmap->width() - hotpoint->x(), bitmap->height() - hotpoint->y());
33 *bitmap = SkBitmapOperations::Rotate(
34 *bitmap, SkBitmapOperations::ROTATION_180_CW);
35 break;
36 case gfx::Display::ROTATE_270:
37 hotpoint->SetPoint(hotpoint->y(), bitmap->width() - hotpoint->x());
38 *bitmap = SkBitmapOperations::Rotate(
39 *bitmap, SkBitmapOperations::ROTATION_270_CW);
40 break;
41 }
42
43 if (scale < FLT_EPSILON) {
44 NOTREACHED() << "Scale must be larger than 0.";
45 scale = 1.0f;
46 }
47
48 if (scale == 1.0f)
49 return;
50
51 gfx::Size scaled_size = gfx::ToFlooredSize(
52 gfx::ScaleSize(gfx::Size(bitmap->width(), bitmap->height()), scale));
53
54 *bitmap = skia::ImageOperations::Resize(
55 *bitmap,
56 skia::ImageOperations::RESIZE_BETTER,
57 scaled_size.width(),
58 scaled_size.height());
59 *hotpoint = gfx::ToFlooredPoint(gfx::ScalePoint(*hotpoint, scale));
60 }
61
GetImageCursorBitmap(int resource_id,float scale,gfx::Display::Rotation rotation,gfx::Point * hotspot,SkBitmap * bitmap)62 void GetImageCursorBitmap(int resource_id,
63 float scale,
64 gfx::Display::Rotation rotation,
65 gfx::Point* hotspot,
66 SkBitmap* bitmap) {
67 const gfx::ImageSkia* image =
68 ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
69 const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(scale);
70 // TODO(oshima): The cursor should use resource scale factor when
71 // fractional scale factor is enabled. crbug.com/372212
72 (*bitmap) = image_rep.sk_bitmap();
73 ScaleAndRotateCursorBitmapAndHotpoint(
74 scale / image_rep.scale(), rotation, bitmap, hotspot);
75 // |image_rep| is owned by the resource bundle. So we do not need to free it.
76 }
77
GetAnimatedCursorBitmaps(int resource_id,float scale,gfx::Display::Rotation rotation,gfx::Point * hotspot,std::vector<SkBitmap> * bitmaps)78 void GetAnimatedCursorBitmaps(int resource_id,
79 float scale,
80 gfx::Display::Rotation rotation,
81 gfx::Point* hotspot,
82 std::vector<SkBitmap>* bitmaps) {
83 // TODO(oshima|tdanderson): Support rotation and fractional scale factor.
84 const gfx::ImageSkia* image =
85 ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
86 const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(scale);
87 SkBitmap bitmap = image_rep.sk_bitmap();
88 int frame_width = bitmap.height();
89 int frame_height = frame_width;
90 int total_width = bitmap.width();
91 DCHECK_EQ(total_width % frame_width, 0);
92 int frame_count = total_width / frame_width;
93 DCHECK_GT(frame_count, 0);
94
95 bitmaps->resize(frame_count);
96
97 for (int frame = 0; frame < frame_count; ++frame) {
98 int x_offset = frame_width * frame;
99 DCHECK_LE(x_offset + frame_width, total_width);
100
101 SkBitmap cropped = SkBitmapOperations::CreateTiledBitmap(
102 bitmap, x_offset, 0, frame_width, frame_height);
103 DCHECK_EQ(frame_width, cropped.width());
104 DCHECK_EQ(frame_height, cropped.height());
105
106 (*bitmaps)[frame] = cropped;
107 }
108 }
109
110 } // namespace ui
111