1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/playback/discardable_image_map.h"
#include <stddef.h>
#include <algorithm>
#include <limits>
#include "base/containers/adapters.h"
#include "cc/base/math_util.h"
#include "cc/playback/display_item_list.h"
#include "third_party/skia/include/utils/SkNWayCanvas.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/skia_util.h"
namespace cc {
SkRect MapRect(const SkMatrix& matrix, const SkRect& src) {
SkRect dst;
matrix.mapRect(&dst, src);
return dst;
}
bool ExtractScale(const SkMatrix& matrix, SkSize* scale) {
*scale = SkSize::Make(matrix.getScaleX(), matrix.getScaleY());
if (matrix.getType() & SkMatrix::kAffine_Mask) {
if (!matrix.decomposeScale(scale)) {
scale->set(1, 1);
return false;
}
}
return true;
}
namespace {
// We're using an NWay canvas with no added canvases, so in effect
// non-overridden functions are no-ops.
class DiscardableImagesMetadataCanvas : public SkNWayCanvas {
public:
DiscardableImagesMetadataCanvas(
int width,
int height,
std::vector<std::pair<DrawImage, gfx::Rect>>* image_set)
: SkNWayCanvas(width, height),
image_set_(image_set),
canvas_bounds_(SkRect::MakeIWH(width, height)) {}
protected:
// we need to "undo" the behavior of SkNWayCanvas, which will try to forward
// it.
void onDrawPicture(const SkPicture* picture,
const SkMatrix* matrix,
const SkPaint* paint) override {
SkCanvas::onDrawPicture(picture, matrix, paint);
}
void onDrawImage(const SkImage* image,
SkScalar x,
SkScalar y,
const SkPaint* paint) override {
const SkMatrix& ctm = getTotalMatrix();
AddImage(
image, SkRect::MakeIWH(image->width(), image->height()),
MapRect(ctm, SkRect::MakeXYWH(x, y, image->width(), image->height())),
ctm, paint);
}
void onDrawImageRect(const SkImage* image,
const SkRect* src,
const SkRect& dst,
const SkPaint* paint,
SrcRectConstraint) override {
const SkMatrix& ctm = getTotalMatrix();
SkRect src_storage;
if (!src) {
src_storage = SkRect::MakeIWH(image->width(), image->height());
src = &src_storage;
}
SkMatrix matrix;
matrix.setRectToRect(*src, dst, SkMatrix::kFill_ScaleToFit);
matrix.postConcat(ctm);
AddImage(image, *src, MapRect(ctm, dst), matrix, paint);
}
void onDrawImageNine(const SkImage* image,
const SkIRect& center,
const SkRect& dst,
const SkPaint* paint) override {
// No cc embedder issues image nine calls.
NOTREACHED();
}
SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec& rec) override {
saved_paints_.push_back(*rec.fPaint);
return SkNWayCanvas::getSaveLayerStrategy(rec);
}
void willSave() override {
saved_paints_.push_back(SkPaint());
return SkNWayCanvas::willSave();
}
void willRestore() override {
DCHECK_GT(saved_paints_.size(), 0u);
saved_paints_.pop_back();
SkNWayCanvas::willRestore();
}
private:
bool ComputePaintBounds(const SkRect& rect,
const SkPaint* current_paint,
SkRect* paint_bounds) {
*paint_bounds = rect;
if (current_paint) {
if (!current_paint->canComputeFastBounds())
return false;
*paint_bounds =
current_paint->computeFastBounds(*paint_bounds, paint_bounds);
}
for (const auto& paint : base::Reversed(saved_paints_)) {
if (!paint.canComputeFastBounds())
return false;
*paint_bounds = paint.computeFastBounds(*paint_bounds, paint_bounds);
}
return true;
}
void AddImage(const SkImage* image,
const SkRect& src_rect,
const SkRect& rect,
const SkMatrix& matrix,
const SkPaint* paint) {
if (!image->isLazyGenerated())
return;
SkRect paint_rect;
bool computed_paint_bounds = ComputePaintBounds(rect, paint, &paint_rect);
if (!computed_paint_bounds) {
// TODO(vmpstr): UMA this case.
paint_rect = canvas_bounds_;
}
if (!paint_rect.intersects(canvas_bounds_))
return;
SkFilterQuality filter_quality = kNone_SkFilterQuality;
if (paint) {
filter_quality = paint->getFilterQuality();
}
SkIRect src_irect;
src_rect.roundOut(&src_irect);
SkSize scale;
bool is_decomposable = ExtractScale(matrix, &scale);
image_set_->push_back(
std::make_pair(DrawImage(image, src_irect, scale, filter_quality,
matrix.hasPerspective(), is_decomposable),
gfx::ToEnclosingRect(gfx::SkRectToRectF(paint_rect))));
}
std::vector<std::pair<DrawImage, gfx::Rect>>* image_set_;
const SkRect canvas_bounds_;
std::vector<SkPaint> saved_paints_;
};
} // namespace
DiscardableImageMap::DiscardableImageMap() {}
DiscardableImageMap::~DiscardableImageMap() {}
skia::RefPtr<SkCanvas> DiscardableImageMap::BeginGeneratingMetadata(
const gfx::Size& bounds) {
DCHECK(all_images_.empty());
return skia::AdoptRef(new DiscardableImagesMetadataCanvas(
bounds.width(), bounds.height(), &all_images_));
}
void DiscardableImageMap::EndGeneratingMetadata() {
images_rtree_.Build(all_images_,
[](const std::pair<DrawImage, gfx::Rect>& image) {
return image.second;
});
}
void DiscardableImageMap::GetDiscardableImagesInRect(
const gfx::Rect& rect,
float raster_scale,
std::vector<DrawImage>* images) const {
std::vector<size_t> indices;
images_rtree_.Search(rect, &indices);
for (size_t index : indices)
images->push_back(all_images_[index].first.ApplyScale(raster_scale));
}
bool DiscardableImageMap::HasDiscardableImageInRect(
const gfx::Rect& rect) const {
return images_rtree_.ContainsItemInRect(rect);
}
DiscardableImageMap::ScopedMetadataGenerator::ScopedMetadataGenerator(
DiscardableImageMap* image_map,
const gfx::Size& bounds)
: image_map_(image_map),
metadata_canvas_(image_map->BeginGeneratingMetadata(bounds)) {}
DiscardableImageMap::ScopedMetadataGenerator::~ScopedMetadataGenerator() {
image_map_->EndGeneratingMetadata();
}
} // namespace cc
|
