Add a linear variant of the stretch effect

Supports SurfaceViews & everything

Test: setprop debug.hwui.stretch_mode 1
Bug: 187718492
Change-Id: I9a222fa4c1a40e80a74cdaf75becb9524cbeed9b

1 files changed, 6 insertions, 0 deletions

diff --git a/libs/hwui/Properties.cpp b/libs/hwui/Properties.cpp
index 7af0a221d228..c58c888b8a21 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -84,6 +84,8 @@ float Properties::defaultSdrWhitePoint = 200.f;
 bool Properties::useHintManager = true;
 int Properties::targetCpuTimePercentage = 70;
 
+StretchEffectBehavior Properties::stretchEffectBehavior = StretchEffectBehavior::Shader;
+
 bool Properties::load() {
     bool prevDebugLayersUpdates = debugLayersUpdates;
     bool prevDebugOverdraw = debugOverdraw;
@@ -135,6 +137,10 @@ bool Properties::load() {
     targetCpuTimePercentage = base::GetIntProperty(PROPERTY_TARGET_CPU_TIME_PERCENTAGE, 70);
     if (targetCpuTimePercentage <= 0 || targetCpuTimePercentage > 100) targetCpuTimePercentage = 70;
 
+    int stretchType = base::GetIntProperty(PROPERTY_STRETCH_EFFECT_TYPE, 0);
+    stretchType = std::clamp(stretchType, 0, static_cast<int>(StretchEffectBehavior::LinearScale));
+    stretchEffectBehavior = static_cast<StretchEffectBehavior>(stretchType);
+
     return (prevDebugLayersUpdates != debugLayersUpdates) || (prevDebugOverdraw != debugOverdraw);
 }