Add private save-behind and draw-behind methods to canvas.HEADp9.0

The draw-behind  is a variant of drawPaint but is automatically clipped
to the bounds of the most recent saveBehind buffer (axis-aligned bounds).

No public exposure outside of the Android framework.

Impl is pretty simple (its a variant of drawPaint)
- find the most recent saveBehind device bounds
- if there is none, draw nothing, else
  - temporarily intersect the device's clip with that bounds
  - drawPaint
  - restore the clip

This patches did not apply cleanly and have been updated to compile
with a previous version of Skia. It was cherry-picked from the
following 3 Skia commits:
148b7fd3ad9c29dec0052de624c26ff291ef8f0a
d567408362bf7847d6000f6786f9a7b2c9d0b88b
9adc82c73df0ef25b708cae8aa48ef9c39ed4c67

Bug: 129117085
Test: None
Change-Id: I291f57885de6e95f749bf5cdb70ac16a5781ffb1

1 files changed, 5 insertions, 1 deletions

diff --git a/src/android/SkAndroidFrameworkUtils.cpp b/src/android/SkAndroidFrameworkUtils.cpp
index f0a7b8a2fc..4eeadd0eba 100644
--- a/src/android/SkAndroidFrameworkUtils.cpp
+++ b/src/android/SkAndroidFrameworkUtils.cpp
@@ -8,6 +8,7 @@
 #include "SkAndroidFrameworkUtils.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
+#include "SkRect.h"
 
 #if SK_SUPPORT_GPU
 #include "GrStyle.h"
@@ -54,9 +55,12 @@ bool SkAndroidFrameworkUtils::clipWithStencil(SkCanvas* canvas) {
 }
 #endif //SK_SUPPORT_GPU
 
+int SkAndroidFrameworkUtils::SaveBehind(SkCanvas* canvas, const SkRect* subset) {
+    return canvas->only_axis_aligned_saveBehind(subset);
+}
+
 void SkAndroidFrameworkUtils::SafetyNetLog(const char* bugNumber) {
     android_errorWriteLog(0x534e4554, bugNumber);
 }
 
 #endif // SK_BUILD_FOR_ANDROID_FRAMEWORK
-