1 // Copyright 2015 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 "third_party/blink/renderer/platform/graphics/bitmap_image_metrics.h"
6 
7 #include "base/metrics/histogram_base.h"
8 #include "base/numerics/safe_conversions.h"
9 #include "third_party/blink/renderer/platform/geometry/int_size.h"
10 #include "third_party/blink/renderer/platform/graphics/color_space_gamut.h"
11 #include "third_party/blink/renderer/platform/instrumentation/histogram.h"
12 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
13 #include "third_party/blink/renderer/platform/wtf/threading.h"
14 
15 namespace blink {
16 
CountDecodedImageType(const String & type)17 void BitmapImageMetrics::CountDecodedImageType(const String& type) {
18   DecodedImageType decoded_image_type =
19       type == "jpg"
20           ? kImageJPEG
21           : type == "png"
22                 ? kImagePNG
23                 : type == "gif"
24                       ? kImageGIF
25                       : type == "webp"
26                             ? kImageWebP
27                             : type == "ico"
28                                   ? kImageICO
29                                   : type == "bmp"
30                                         ? kImageBMP
31                                         : DecodedImageType::kImageUnknown;
32 
33   DEFINE_THREAD_SAFE_STATIC_LOCAL(
34       EnumerationHistogram, decoded_image_type_histogram,
35       ("Blink.DecodedImageType", kDecodedImageTypeEnumEnd));
36   decoded_image_type_histogram.Count(decoded_image_type);
37 }
38 
CountImageOrientation(const ImageOrientationEnum orientation)39 void BitmapImageMetrics::CountImageOrientation(
40     const ImageOrientationEnum orientation) {
41   DEFINE_THREAD_SAFE_STATIC_LOCAL(
42       EnumerationHistogram, orientation_histogram,
43       ("Blink.DecodedImage.Orientation", kImageOrientationEnumEnd));
44   orientation_histogram.Count(orientation);
45 }
46 
CountImageJpegDensity(int image_min_side,uint64_t density_centi_bpp,size_t image_size_bytes)47 void BitmapImageMetrics::CountImageJpegDensity(int image_min_side,
48                                                uint64_t density_centi_bpp,
49                                                size_t image_size_bytes) {
50   // All bpp samples are reported in the range 0.01 to 10 bpp as integer number
51   // of 0.01 bpp. We don't report for any sample for small images (0 to 99px on
52   // the smallest dimension).
53   //
54   // The histogram JpegDensity.KiBWeighted reports the number of KiB decoded for
55   // a given bpp value.
56 
57   if (image_min_side >= 100) {
58     DEFINE_THREAD_SAFE_STATIC_LOCAL(
59         CustomCountHistogram, density_histogram,
60         ("Blink.DecodedImage.JpegDensity.KiBWeighted", 1, 1000, 100));
61     int image_size_kib = (image_size_bytes + 512) / 1024;
62     if (image_size_kib > 0) {
63       density_histogram.CountMany(
64           base::saturated_cast<base::Histogram::Sample>(density_centi_bpp),
65           image_size_kib);
66     }
67   }
68 }
69 
CountJpegArea(const IntSize & size)70 void BitmapImageMetrics::CountJpegArea(const IntSize& size) {
71   DEFINE_THREAD_SAFE_STATIC_LOCAL(
72       CustomCountHistogram, image_area_histogram,
73       ("Blink.ImageDecoders.Jpeg.Area", 1 /* min */, 8192 * 8192 /* max */,
74        100 /* bucket_count */));
75   // A base::HistogramBase::Sample may not fit |size.Area()|. Hence the use of
76   // saturated_cast.
77   image_area_histogram.Count(
78       base::saturated_cast<base::HistogramBase::Sample>(size.Area()));
79 }
80 
CountJpegColorSpace(JpegColorSpace color_space)81 void BitmapImageMetrics::CountJpegColorSpace(JpegColorSpace color_space) {
82   DEFINE_THREAD_SAFE_STATIC_LOCAL(
83       EnumerationHistogram, color_space_histogram,
84       ("Blink.ImageDecoders.Jpeg.ColorSpace", JpegColorSpace::kMaxValue));
85   color_space_histogram.Count(color_space);
86 }
87 
88 }  // namespace blink
89