GrCopySurfaceBatch
Review URL: https://codereview.chromium.org/1289673004
diff --git a/src/gpu/batches/GrCopySurfaceBatch.cpp b/src/gpu/batches/GrCopySurfaceBatch.cpp
new file mode 100644
index 0000000..2c859f8
--- /dev/null
+++ b/src/gpu/batches/GrCopySurfaceBatch.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "GrCopySurfaceBatch.h"
+
+// returns true if the read/written rect intersects the src/dst and false if not.
+static bool clip_srcrect_and_dstpoint(const GrSurface* dst,
+ const GrSurface* src,
+ const SkIRect& srcRect,
+ const SkIPoint& dstPoint,
+ SkIRect* clippedSrcRect,
+ SkIPoint* clippedDstPoint) {
+ *clippedSrcRect = srcRect;
+ *clippedDstPoint = dstPoint;
+
+ // clip the left edge to src and dst bounds, adjusting dstPoint if necessary
+ if (clippedSrcRect->fLeft < 0) {
+ clippedDstPoint->fX -= clippedSrcRect->fLeft;
+ clippedSrcRect->fLeft = 0;
+ }
+ if (clippedDstPoint->fX < 0) {
+ clippedSrcRect->fLeft -= clippedDstPoint->fX;
+ clippedDstPoint->fX = 0;
+ }
+
+ // clip the top edge to src and dst bounds, adjusting dstPoint if necessary
+ if (clippedSrcRect->fTop < 0) {
+ clippedDstPoint->fY -= clippedSrcRect->fTop;
+ clippedSrcRect->fTop = 0;
+ }
+ if (clippedDstPoint->fY < 0) {
+ clippedSrcRect->fTop -= clippedDstPoint->fY;
+ clippedDstPoint->fY = 0;
+ }
+
+ // clip the right edge to the src and dst bounds.
+ if (clippedSrcRect->fRight > src->width()) {
+ clippedSrcRect->fRight = src->width();
+ }
+ if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
+ clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
+ }
+
+ // clip the bottom edge to the src and dst bounds.
+ if (clippedSrcRect->fBottom > src->height()) {
+ clippedSrcRect->fBottom = src->height();
+ }
+ if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
+ clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
+ }
+
+ // The above clipping steps may have inverted the rect if it didn't intersect either the src or
+ // dst bounds.
+ return !clippedSrcRect->isEmpty();
+}
+
+GrBatch* GrCopySurfaceBatch::Create(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
+ const SkIPoint& dstPoint) {
+ SkASSERT(dst);
+ SkASSERT(src);
+
+ SkIRect clippedSrcRect;
+ SkIPoint clippedDstPoint;
+ // If the rect is outside the src or dst then we've already succeeded.
+ if (!clip_srcrect_and_dstpoint(dst,
+ src,
+ srcRect,
+ dstPoint,
+ &clippedSrcRect,
+ &clippedDstPoint)) {
+ return NULL;
+ }
+ return SkNEW_ARGS(GrCopySurfaceBatch, (dst, src, clippedSrcRect, clippedDstPoint));
+}