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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&,
const SkStrokeRec&,
const GrDrawTarget*,
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;
}
GrPathRenderer::StencilSupport GrSoftwarePathRenderer::onGetStencilSupport(
const SkPath&,
const SkStrokeRec&,
const GrDrawTarget*) const {
return GrPathRenderer::kNoSupport_StencilSupport;
}
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 SkMatrix& matrix,
GrIRect* devPathBounds,
GrIRect* devClipBounds) {
// compute bounds as intersection of rt size, clip, and path
const GrRenderTarget* rt = target->getDrawState().getRenderTarget();
if (NULL == rt) {
return false;
}
*devPathBounds = GrIRect::MakeWH(rt->width(), rt->height());
target->getClip()->getConservativeBounds(rt, devClipBounds);
// TODO: getConservativeBounds already intersects with the
// render target's bounding box. Remove this next line
if (!devPathBounds->intersect(*devClipBounds)) {
return false;
}
if (!path.getBounds().isEmpty()) {
GrRect pathSBounds;
matrix.mapRect(&pathSBounds, path.getBounds());
GrIRect pathIBounds;
pathSBounds.roundOut(&pathIBounds);
if (!devPathBounds->intersect(pathIBounds)) {
// set the correct path bounds, as this would be used later.
*devPathBounds = pathIBounds;
return false;
}
} else {
*devPathBounds = GrIRect::EmptyIRect();
return false;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
void draw_around_inv_path(GrDrawTarget* target,
const GrIRect& devClipBounds,
const GrIRect& devPathBounds) {
GrDrawState::AutoDeviceCoordDraw adcd(target->drawState());
if (!adcd.succeeded()) {
return;
}
GrRect rect;
if (devClipBounds.fTop < devPathBounds.fTop) {
rect.iset(devClipBounds.fLeft, devClipBounds.fTop,
devClipBounds.fRight, devPathBounds.fTop);
target->drawSimpleRect(rect, NULL);
}
if (devClipBounds.fLeft < devPathBounds.fLeft) {
rect.iset(devClipBounds.fLeft, devPathBounds.fTop,
devPathBounds.fLeft, devPathBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
if (devClipBounds.fRight > devPathBounds.fRight) {
rect.iset(devPathBounds.fRight, devPathBounds.fTop,
devClipBounds.fRight, devPathBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
if (devClipBounds.fBottom > devPathBounds.fBottom) {
rect.iset(devClipBounds.fLeft, devPathBounds.fBottom,
devClipBounds.fRight, devClipBounds.fBottom);
target->drawSimpleRect(rect, NULL);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
if (NULL == fContext) {
return false;
}
GrDrawState* drawState = target->drawState();
SkMatrix vm = drawState->getViewMatrix();
GrIRect devPathBounds, devClipBounds;
if (!get_path_and_clip_bounds(target, path, vm,
&devPathBounds, &devClipBounds)) {
if (path.isInverseFillType()) {
draw_around_inv_path(target, devClipBounds, devPathBounds);
}
return true;
}
SkAutoTUnref<GrTexture> texture(
GrSWMaskHelper::DrawPathMaskToTexture(fContext, path, stroke,
devPathBounds,
antiAlias, &vm));
if (NULL == texture) {
return false;
}
GrSWMaskHelper::DrawToTargetWithPathMask(texture, target, devPathBounds);
if (path.isInverseFillType()) {
draw_around_inv_path(target, devClipBounds, devPathBounds);
}
return true;
}
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