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, 15 insertions, 2 deletions

diff --git a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
index 1ae06d082744..509884e23c26 100644
--- a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
+++ b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
@@ -171,11 +171,16 @@ void RenderNodeDrawable::forceDraw(SkCanvas* canvas) const {
     displayList->mProjectedOutline = nullptr;
 }
 
+static bool stretchNeedsLayer(const LayerProperties& properties) {
+    return Properties::stretchEffectBehavior == StretchEffectBehavior::Shader &&
+           !properties.getStretchEffect().isEmpty();
+}
+
 static bool layerNeedsPaint(const sk_sp<SkImage>& snapshotImage, const LayerProperties& properties,
                             float alphaMultiplier, SkPaint* paint) {
     if (alphaMultiplier < 1.0f || properties.alpha() < 255 ||
         properties.xferMode() != SkBlendMode::kSrcOver || properties.getColorFilter() != nullptr ||
-        properties.getImageFilter() != nullptr || !properties.getStretchEffect().isEmpty()) {
+        properties.getImageFilter() != nullptr || stretchNeedsLayer(properties)) {
         paint->setAlpha(properties.alpha() * alphaMultiplier);
         paint->setBlendMode(properties.xferMode());
         paint->setColorFilter(sk_ref_sp(properties.getColorFilter()));
@@ -247,7 +252,8 @@ void RenderNodeDrawable::drawContent(SkCanvas* canvas) const {
             }
 
             const StretchEffect& stretch = properties.layerProperties().getStretchEffect();
-            if (stretch.isEmpty()) {
+            if (stretch.isEmpty() ||
+                Properties::stretchEffectBehavior != StretchEffectBehavior::Shader) {
                 // If we don't have any stretch effects, issue the filtered
                 // canvas draw calls to make sure we still punch a hole
                 // with the same canvas transformation + clip into the target
@@ -326,6 +332,13 @@ void RenderNodeDrawable::setViewProperties(const RenderProperties& properties, S
             canvas->concat(*properties.getTransformMatrix());
         }
     }
+    if (Properties::stretchEffectBehavior == StretchEffectBehavior::LinearScale) {
+        const StretchEffect& stretch = properties.layerProperties().getStretchEffect();
+        if (!stretch.isEmpty()) {
+            canvas->concat(
+                    stretch.makeLinearStretch(properties.getWidth(), properties.getHeight()));
+        }
+    }
     const bool isLayer = properties.effectiveLayerType() != LayerType::None;
     int clipFlags = properties.getClippingFlags();
     if (properties.getAlpha() < 1) {