Begin atlasing

This CL makes it possible for pulled-forward-layers to be atlased. It currently has a couple glaring limitations (which is why it is disabled):

1) the atlased layers cannot be purged nor aged out
2) the texture backing the atlas is not pulled from (or returned to) the resource cache

#1 is on hold until we have a recycling rectanizer

A separate major limitation (the non-atlased layers aren't cached) is blocked until we can transmute entries in the resource cache from scratch to non-scratch while potentially preserving their contents.

R=bsalomon@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/354533004

1 files changed, 19 insertions, 0 deletions

diff --git a/include/gpu/GrRect.h b/include/gpu/GrRect.h
index ddb23b5a19..14130f831c 100644
--- a/include/gpu/GrRect.h
+++ b/include/gpu/GrRect.h
@@ -20,6 +20,18 @@ struct GrIRect16 {
         return r;
     }
 
+    static GrIRect16 SK_WARN_UNUSED_RESULT MakeWH(int16_t w, int16_t h) {
+        GrIRect16 r;
+        r.set(0, 0, w, h);
+        return r;
+    }
+
+    static GrIRect16 SK_WARN_UNUSED_RESULT MakeXYWH(int16_t x, int16_t y, int16_t w, int16_t h) {
+        GrIRect16 r;
+        r.set(x, y, x + w, y + h);
+        return r;
+    }
+
     int width() const { return fRight - fLeft; }
     int height() const { return fBottom - fTop; }
     int area() const { return this->width() * this->height(); }
@@ -27,6 +39,13 @@ struct GrIRect16 {
 
     void setEmpty() { memset(this, 0, sizeof(*this)); }
 
+    void set(int16_t left, int16_t top, int16_t right, int16_t bottom) {
+        fLeft = left;
+        fTop = top;
+        fRight = right;
+        fBottom = bottom;
+    }
+
     void set(const SkIRect& r) {
         fLeft   = SkToS16(r.fLeft);
         fTop    = SkToS16(r.fTop);