blob: 5feed18f76fb03ada3fd2e232766db0cc7581a71 [file] [log] [blame]
/*
* 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 "GrCopySurfaceOp.h"
// returns true if the read/written rect intersects the src/dst and false if not.
static bool clip_src_rect_and_dst_point(const GrSurfaceProxy* dst,
const GrSurfaceProxy* 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();
}
std::unique_ptr<GrOp> GrCopySurfaceOp::Make(GrResourceProvider* resourceProvider,
GrSurfaceProxy* dstProxy, GrSurfaceProxy* srcProxy,
const SkIRect& srcRect,
const SkIPoint& dstPoint) {
SkASSERT(dstProxy);
SkASSERT(srcProxy);
if (GrPixelConfigIsSint(dstProxy->config()) != GrPixelConfigIsSint(srcProxy->config())) {
return nullptr;
}
if (GrPixelConfigIsCompressed(dstProxy->config())) {
return nullptr;
}
SkIRect clippedSrcRect;
SkIPoint clippedDstPoint;
// If the rect is outside the srcProxy or dstProxy then we've already succeeded.
if (!clip_src_rect_and_dst_point(dstProxy, srcProxy, srcRect, dstPoint,
&clippedSrcRect, &clippedDstPoint)) {
return nullptr;
}
// MDB TODO: remove this instantiation
GrSurface* dstTex = dstProxy->instantiate(resourceProvider);
if (!dstTex) {
return nullptr;
}
GrSurface* srcTex = srcProxy->instantiate(resourceProvider);
if (!srcTex) {
return nullptr;
}
return std::unique_ptr<GrOp>(new GrCopySurfaceOp(dstTex, srcTex,
dstProxy->uniqueID(), srcProxy->uniqueID(),
clippedSrcRect, clippedDstPoint));
}