Add perspective support to GrTextureOp.

Bug: skia:
Change-Id: Idea4ffae37dc2c2f339af60a2b74ded476091758
Reviewed-on: https://skia-review.googlesource.com/127600
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/gpu/GrQuad.cpp b/src/gpu/GrQuad.cpp
index 724a827f21..93bd761970 100644
--- a/src/gpu/GrQuad.cpp
+++ b/src/gpu/GrQuad.cpp
@@ -43,3 +43,43 @@ GrQuad::GrQuad(const SkRect& rect, const SkMatrix& m) {
         y.store(fY);
     }
 }
+
+GrPerspQuad::GrPerspQuad(const SkRect& rect, const SkMatrix& m) {
+    SkMatrix::TypeMask tm = m.getType();
+    if (tm <= (SkMatrix::kScale_Mask | SkMatrix::kTranslate_Mask)) {
+        auto r = Sk4f::Load(&rect);
+        const Sk4f t(m.getTranslateX(), m.getTranslateY(), m.getTranslateX(), m.getTranslateY());
+        if (tm <= SkMatrix::kTranslate_Mask) {
+            r += t;
+        } else {
+            const Sk4f s(m.getScaleX(), m.getScaleY(), m.getScaleX(), m.getScaleY());
+            r = r * s + t;
+        }
+        SkNx_shuffle<0, 0, 2, 2>(r).store(fX);
+        SkNx_shuffle<1, 3, 1, 3>(r).store(fY);
+        fW[0] = fW[1] = fW[2] = fW[3] = 1.f;
+        fIW[0] = fIW[1] = fIW[2] = fIW[3] = 1.f;
+    } else {
+        Sk4f rx(rect.fLeft, rect.fLeft, rect.fRight, rect.fRight);
+        Sk4f ry(rect.fTop, rect.fBottom, rect.fTop, rect.fBottom);
+        Sk4f sx(m.getScaleX());
+        Sk4f kx(m.getSkewX());
+        Sk4f tx(m.getTranslateX());
+        Sk4f ky(m.getSkewY());
+        Sk4f sy(m.getScaleY());
+        Sk4f ty(m.getTranslateY());
+        SkNx_fma(sx, rx, SkNx_fma(kx, ry, tx)).store(fX);
+        SkNx_fma(ky, rx, SkNx_fma(sy, ry, ty)).store(fY);
+        if (m.hasPerspective()) {
+            Sk4f w0(m.getPerspX());
+            Sk4f w1(m.getPerspY());
+            Sk4f w2(m.get(SkMatrix::kMPersp2));
+            auto w = SkNx_fma(w0, rx, SkNx_fma(w1, ry, w2));
+            w.store(fW);
+            w.invert().store(fIW);
+        } else {
+            fW[0] = fW[1] = fW[2] = fW[3] = 1.f;
+            fIW[0] = fIW[1] = fIW[2] = fIW[3] = 1.f;
+        }
+    }
+}