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/*
* 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 nullptr;
}
return new GrCopySurfaceBatch(dst, src, clippedSrcRect, clippedDstPoint);
}
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