1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 #include "../utils/RingBuffer.h"
19 
20 #include <utils/String8.h>
21 
22 namespace android {
23 namespace uirenderer {
24 
25 class CacheTexture;
26 struct CachedGlyphInfo;
27 
28 // Tracks glyph uploads and recent rendered/skipped glyphs, so it can give an idea
29 // what a missing character is: skipped glyph, wrong coordinates in cache texture etc.
30 class FontCacheHistoryTracker {
31 public:
32     void glyphRendered(CachedGlyphInfo*, int penX, int penY);
33     void glyphUploaded(CacheTexture*, uint32_t x, uint32_t y, uint16_t glyphW, uint16_t glyphH);
34     void glyphsCleared(CacheTexture*);
35     void frameCompleted();
36 
37     void dump(String8& log) const;
38 
39 private:
40     struct CachedGlyph {
41         void* texture;
42         uint16_t generation;
43         uint16_t startX;
44         uint16_t startY;
45         uint16_t bitmapW;
46         uint16_t bitmapH;
47     };
48 
49     struct RenderEntry {
50         CachedGlyph glyph;
51         int penX;
52         int penY;
53     };
54 
55     static void dumpCachedGlyph(String8& log, const CachedGlyph& glyph);
56     static void dumpRenderEntry(String8& log, const RenderEntry& entry);
57     static void dumpUploadEntry(String8& log, const CachedGlyph& glyph);
58 
59     RingBuffer<RenderEntry, 300> mRenderHistory;
60     RingBuffer<CachedGlyph, 120> mUploadHistory;
61     uint16_t generation = 0;
62 };
63 
64 };  // namespace uirenderer
65 };  // namespace android