Index: src/gpu/batches/GrCopySurfaceBatch.cpp |
diff --git a/src/gpu/batches/GrCopySurfaceBatch.cpp b/src/gpu/batches/GrCopySurfaceBatch.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..2c859f8e4667cd13ca474662ea8e37ade0e93274 |
--- /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)); |
+} |