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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrSoftwarePathRenderer.h"
#include "GrContext.h"
#include "GrSWMaskHelper.h"
////////////////////////////////////////////////////////////////////////////////
bool GrSoftwarePathRenderer::canDrawPath(const SkPath& path,
GrPathFill fill,
const GrDrawTarget* target,
bool antiAlias) const {
if (!antiAlias || NULL == fContext) {
// TODO: We could allow the SW path to also handle non-AA paths but
// this would mean that GrDefaultPathRenderer would never be called
// (since it appears after the SW renderer in the path renderer
// chain). Some testing would need to be done r.e. performance
// and consistency of the resulting images before removing
// the "!antiAlias" clause from the above test
return false;
}
return true;
}
namespace {
////////////////////////////////////////////////////////////////////////////////
// gets device coord bounds of path (not considering the fill) and clip. The
// path bounds will be a subset of the clip bounds. returns false if
// path bounds would be empty.
bool get_path_and_clip_bounds(const GrDrawTarget* target,
const SkPath& path,
const GrMatrix& matrix,
GrIRect* pathBounds,
GrIRect* clipBounds) {
// compute bounds as intersection of rt size, clip, and path
const GrRenderTarget* rt = target->getDrawState().getRenderTarget();
if (NULL == rt) {
return false;
}
*pathBounds = GrIRect::MakeWH(rt->width(), rt->height());
const GrClipData* clipData = target->getClip();
SkRect conservativeBounds = clipData->fClipStack->getConservativeBounds();
conservativeBounds.roundOut(clipBounds);
if (!pathBounds->intersect(*clipBounds)) {
return false;
}
if (!path.getBounds().isEmpty()) {
GrRect pathSBounds;
matrix.mapRect(&pathSBounds, path.getBounds());
GrIRect pathIBounds;
pathSBounds.roundOut(&pathIBounds);
if (!pathBounds->intersect(pathIBounds)) {
// set the correct path bounds, as this would be used later.
*pathBounds = pathIBounds;
return false;
}
} else {
*pathBounds = GrIRect::EmptyIRect();
return false;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
void draw_around_inv_path(GrDrawTarget* target,
const GrIRect& clipBounds,
const GrIRect& pathBounds) {
GrDrawTarget::AutoDeviceCoordDraw adcd(target);
if (!adcd.succeeded()) {
return;
}
GrRect rect;
if (clipBounds.fTop < pathBounds.fTop) {
rect.iset(clipBounds.fLeft, clipBounds.fTop,
clipBounds.fRight, pathBounds.fTop);
target->drawSimpleRect(rect, NULL);
}
if (clipBounds.fLeft < pathBounds.fLeft) {
rect.iset(clipBounds.fLeft, pathBounds.fTop,
pathBounds.fLeft, pathBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
if (clipBounds.fRight > pathBounds.fRight) {
rect.iset(pathBounds.fRight, pathBounds.fTop,
clipBounds.fRight, pathBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
if (clipBounds.fBottom > pathBounds.fBottom) {
rect.iset(clipBounds.fLeft, pathBounds.fBottom,
clipBounds.fRight, clipBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
const GrVec* translate,
GrDrawTarget* target,
bool antiAlias) {
if (NULL == fContext) {
return false;
}
GrDrawState* drawState = target->drawState();
GrMatrix vm = drawState->getViewMatrix();
if (NULL != translate) {
vm.postTranslate(translate->fX, translate->fY);
}
GrIRect pathBounds, clipBounds;
if (!get_path_and_clip_bounds(target, path, vm,
&pathBounds, &clipBounds)) {
if (GrIsFillInverted(fill)) {
draw_around_inv_path(target, clipBounds, pathBounds);
}
return true;
}
SkAutoTUnref<GrTexture> texture(
GrSWMaskHelper::DrawPathMaskToTexture(fContext, path,
pathBounds, fill,
antiAlias, &vm));
if (NULL == texture) {
return false;
}
GrSWMaskHelper::DrawToTargetWithPathMask(texture, target, pathBounds);
if (GrIsFillInverted(fill)) {
draw_around_inv_path(target, clipBounds, pathBounds);
}
return true;
}
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