NOTE: Linear blending is currently disabled in this CL as the
feature is still a work in progress
Android currently performs all blending (any kind of linear math
on colors really) on gamma-encoded colors. Since Android assumes
that the default color space is sRGB, all bitmaps and colors
are encoded with the sRGB Opto-Electronic Conversion Function
(OECF, which can be approximated with a power function). Since
the power curve is not linear, our linear math is incorrect.
The result is that we generate colors that tend to be too dark;
this affects blending but also anti-aliasing, gradients, blurs,
etc.
The solution is to convert gamma-encoded colors back to linear
space before doing any math on them, using the sRGB Electo-Optical
Conversion Function (EOCF). This is achieved in different
ways in different parts of the pipeline:
- Using hardware conversions when sampling from OpenGL textures
or writing into OpenGL frame buffers
- Using software conversion functions, to translate app-supplied
colors to and from sRGB
- Using Skia's color spaces
Any type of processing on colors must roughly ollow these steps:
[sRGB input]->EOCF->[linear data]->[processing]->OECF->[sRGB output]
For the sRGB color space, the conversion functions are defined as
follows:
OECF(linear) :=
linear <= 0.0031308 ? linear * 12.92 : (pow(linear, 1/2.4) * 1.055) - 0.055
EOCF(srgb) :=
srgb <= 0.04045 ? srgb / 12.92 : pow((srgb + 0.055) / 1.055, 2.4)
The EOCF is simply the reciprocal of the OECF.
While it is highly recommended to use the exact sRGB conversion
functions everywhere possible, it is sometimes useful or beneficial
to rely on approximations:
- pow(x,2.2) and pow(x,1/2.2)
- x^2 and sqrt(x)
The latter is particularly useful in fragment shaders (for instance
to apply dithering in sRGB space), especially if the sqrt() can be
replaced with an inversesqrt().
Here is a fairly exhaustive list of modifications implemented
in this CL:
- Set TARGET_ENABLE_LINEAR_BLENDING := false in BoardConfig.mk
to disable linear blending. This is only for GLES 2.0 GPUs
with no hardware sRGB support. This flag is currently assumed
to be false (see note above)
- sRGB writes are disabled when entering a functor (WebView).
This will need to be fixed at some point
- Skia bitmaps are created with the sRGB color space
- Bitmaps using a 565 config are expanded to 888
- Linear blending is disabled when entering a functor
- External textures are not properly sampled (see below)
- Gradients are interpolated in linear space
- Texture-based dithering was replaced with analytical dithering
- Dithering is done in the quantization color space, which is
why we must do EOCF(OECF(color)+dither)
- Text is now gamma corrected differently depending on the luminance
of the source pixel. The asumption is that a bright pixel will be
blended on a dark background and the other way around. The source
alpha is gamma corrected to thicken dark on bright and thin
bright on dark to match the intended design of fonts. This also
matches the behavior of popular design/drawing applications
- Removed the asset atlas. It did not contain anything useful and
could not be sampled in sRGB without a yet-to-be-defined GL
extension
- The last column of color matrices is converted to linear space
because its value are added to linear colors
Missing features:
- Resource qualifier?
- Regeneration of goldeng images for automated tests
- Handle alpha8/grey8 properly
- Disable sRGB write for layers with external textures
Test: Manual testing while work in progress
Bug: 29940137
Change-Id: I6a07b15ab49b554377cd33a36b6d9971a15e9a0b
- Update RetailDemoModeService to not do anything outside demo mode.
- Add am command get-started-user-state which is needed for cts tests.
- Update unit tests for RetailDemoModeService.
Bug: 31342350
Test: adb shell am instrument -e class com.android.server.retaildemo.RetailDemoModeServiceTest -w com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner
Change-Id: Idf50512facd27d47d7111e75cbc2f7b260f49740
in System Server.
Change code to use traceEnd() instead
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER); to generate accurate
measurements.
Test: 1-line change. 0-risk change.
bug: 31654120
Change-Id: I24d1468ccf934dbe912822996174eb780a46994c
Added a service that listens whether emergency affordances
are necessary.
If the they are needed, it adds an option to the
global actions dialog that directly launches the
emergency call and also adds a long-press listener
to the keyguard emergency button.
Test: adb shell settings put global force_emergency_affordance 1 && adb shell settings put global emergency_affordance_number 111112
Fixes: 30404490
Change-Id: Ib96a15da2ef4b568a8d77140ebca6aa6f20f5ddb
This patch defines a new metrics service for IpConnectivity events
defined in android.net.metrics, separate from currently existing
MetricsLoggerService.
Similarly to MetricsLoggerService, the new service has an event buffer.
It also implements a dumpsys interface that can be used to flush events
and output a serialized proto.
Bug: 31254800
Change-Id: I0c3faeb4008b283f85d9ba9460371fa68956ea3b
This service proxy (together with the native server) are not needed on
Android Wear, as we don't have any watches with cameras.
Bug: 28560707
Change-Id: Ie4a830a3ba48c90d3e968fc5cdf57ccafcc1f5d8
Build serial is non-user resettable freely available deivice
identifier. It can be used by ad-netowrks to track the user
across apps which violates the user's privacy.
This change deprecates Build.SERIAL and adds a new Build.getSerial()
API which requires holding the read_phone_state permission.
The Build.SERIAL value is set to "undefined" for apps targeting
high enough SDK and for legacy app the value is still available.
bug:31402365
Change-Id: Iddd13430b2bd1d9ab4966e31038ecabdbdcec06d
In attempt to speed up Android Boot time we need better understand parts
that are taking long time during boot phase. SystemServer accounts to
~30-40% of boot time, so profiling and monitoring it should help
identify problematic parts.
Along with systrace logcat messages were added to simplify on the glance
check of boot process timing without the need to collect systrace.
Change-Id: Ice203eb3e6aa662d1a7cefc8bcd76f372347f4a0
Publish DropBox extremely early during boot process so that it can
pick up wtf() calls while booting.
Bug: 28634953
Change-Id: Ie71d53fc125ebc47fa08ef59a8b7e4f66f2e805c
Add getKeyAttestationApplicationId and the Parcelables
KeyAttestationPackageInfo and KeyAttestationApplicationId,
needed by keystore.
Bug: 22914603
Change-Id: I89a88cd9cd80e9b132ca67fc452e9cae8b8ad241
NetworkPolicyManagerService (NPMS) used to depend on screen on/off
changes to determine if a foreground activity should have network
restrictions, but such check is now redundant since ActivityManager
already changes the proper UID state (like going from TOP to
TOP_SLEEPING) when the screen status is changed.
Removing such code decreases the NPMS lock contention when the screen is
turned on in about 3-5ms.
Change-Id: I2853443efedbf14961ae9a5b2e72689d4d1a646c
BUG: 30785671
(cherry picked from commit 88f40ad9a721ee30708be82f66fb58c64f1d36b5)
NetworkPolicyManagerService (NPMS) used to depend on screen on/off
changes to determine if a foreground activity should have network
restrictions, but such check is now redundant since ActivityManager
already changes the proper UID state (like going from TOP to
TOP_SLEEPING) when the screen status is changed.
Removing such code decreases the NPMS lock contention when the screen is
turned on in about 3-5ms.
Change-Id: I2853443efedbf14961ae9a5b2e72689d4d1a646c
BUG: 30785671
A recent patch started returning "null" when a Binder service
required to provide a manager wasn't yet registered.
This fixes four locations where that new logging was triggered: in
two cases by adjusting the fetching ordering, and in two other cases
by only fetching when the device supports the manager.
Bug: 28634953
Change-Id: I84dbccffa4ac760c10a2bbcb234f21272bfecb91
- Check for null where appropriate when using WM from a test
- Inject WindowManagerPolicy for test can have its own policy
- Added skeleton for WindowStateTests that will contain tests
for WindowState class.
Bug: 30060889
Change-Id: I0cd7d50c98de16c7412759401075c4bb48d13dfe
Bug: 28615069
Tints the display at night automatically according to your schedule or
using the sunrise/sunset corresponding to your current location.
Change-Id: Ie56b4eed88cc2fcbae88002492b1edad5820b6b1
