1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9 #include "GrCopySurfaceBatch.h"
10
11 // returns true if the read/written rect intersects the src/dst and false if not.
ClipSrcRectAndDstPoint(const GrSurface * dst,const GrSurface * src,const SkIRect & srcRect,const SkIPoint & dstPoint,SkIRect * clippedSrcRect,SkIPoint * clippedDstPoint)12 bool GrCopySurfaceBatch::ClipSrcRectAndDstPoint(const GrSurface* dst,
13 const GrSurface* src,
14 const SkIRect& srcRect,
15 const SkIPoint& dstPoint,
16 SkIRect* clippedSrcRect,
17 SkIPoint* clippedDstPoint) {
18 *clippedSrcRect = srcRect;
19 *clippedDstPoint = dstPoint;
20
21 // clip the left edge to src and dst bounds, adjusting dstPoint if necessary
22 if (clippedSrcRect->fLeft < 0) {
23 clippedDstPoint->fX -= clippedSrcRect->fLeft;
24 clippedSrcRect->fLeft = 0;
25 }
26 if (clippedDstPoint->fX < 0) {
27 clippedSrcRect->fLeft -= clippedDstPoint->fX;
28 clippedDstPoint->fX = 0;
29 }
30
31 // clip the top edge to src and dst bounds, adjusting dstPoint if necessary
32 if (clippedSrcRect->fTop < 0) {
33 clippedDstPoint->fY -= clippedSrcRect->fTop;
34 clippedSrcRect->fTop = 0;
35 }
36 if (clippedDstPoint->fY < 0) {
37 clippedSrcRect->fTop -= clippedDstPoint->fY;
38 clippedDstPoint->fY = 0;
39 }
40
41 // clip the right edge to the src and dst bounds.
42 if (clippedSrcRect->fRight > src->width()) {
43 clippedSrcRect->fRight = src->width();
44 }
45 if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
46 clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
47 }
48
49 // clip the bottom edge to the src and dst bounds.
50 if (clippedSrcRect->fBottom > src->height()) {
51 clippedSrcRect->fBottom = src->height();
52 }
53 if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
54 clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
55 }
56
57 // The above clipping steps may have inverted the rect if it didn't intersect either the src or
58 // dst bounds.
59 return !clippedSrcRect->isEmpty();
60 }
61
Create(GrSurface * dst,GrSurface * src,const SkIRect & srcRect,const SkIPoint & dstPoint)62 GrBatch* GrCopySurfaceBatch::Create(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
63 const SkIPoint& dstPoint) {
64 SkASSERT(dst);
65 SkASSERT(src);
66
67 SkIRect clippedSrcRect;
68 SkIPoint clippedDstPoint;
69 // If the rect is outside the src or dst then we've already succeeded.
70 if (!ClipSrcRectAndDstPoint(dst, src, srcRect, dstPoint, &clippedSrcRect, &clippedDstPoint)) {
71 return nullptr;
72 }
73 return new GrCopySurfaceBatch(dst, src, clippedSrcRect, clippedDstPoint);
74 }
75