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#include "GrCopySurfaceOp.h"
9#include "GrGpu.h"
10
11// returns true if the read/written rect intersects the src/dst and false if not.
12static bool clip_src_rect_and_dst_point(const GrSurfaceProxy* dst,
13                                        const GrSurfaceProxy* 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
62std::unique_ptr<GrOp> GrCopySurfaceOp::Make(GrSurfaceProxy* dstProxy, GrSurfaceProxy* srcProxy,
63                                            const SkIRect& srcRect,
64                                            const SkIPoint& dstPoint) {
65    SkASSERT(dstProxy);
66    SkASSERT(srcProxy);
67    if (GrPixelConfigIsSint(dstProxy->config()) != GrPixelConfigIsSint(srcProxy->config())) {
68        return nullptr;
69    }
70    SkIRect clippedSrcRect;
71    SkIPoint clippedDstPoint;
72    // If the rect is outside the srcProxy or dstProxy then we've already succeeded.
73    if (!clip_src_rect_and_dst_point(dstProxy, srcProxy, srcRect, dstPoint,
74                                     &clippedSrcRect, &clippedDstPoint)) {
75        return nullptr;
76    }
77
78    return std::unique_ptr<GrOp>(new GrCopySurfaceOp(dstProxy, srcProxy,
79                                                     clippedSrcRect, clippedDstPoint));
80}
81
82void GrCopySurfaceOp::onExecute(GrOpFlushState* state) {
83    SkASSERT(!state->commandBuffer());
84
85    if (!fDst.get()->instantiate(state->resourceProvider()) ||
86        !fSrc.get()->instantiate(state->resourceProvider())) {
87        return;
88    }
89
90    state->gpu()->copySurface(fDst.get()->priv().peekSurface(),
91                              fSrc.get()->priv().peekSurface(), fSrcRect, fDstPoint);
92}
93