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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 GrDrawTarget*,
const GrDrawState*,
const SkPath&,
const SkStrokeRec&,
bool antiAlias) const {
if (NULL == fContext) {
return false;
}
return true;
}
GrPathRenderer::StencilSupport
GrSoftwarePathRenderer::onGetStencilSupport(const GrDrawTarget*,
const GrDrawState*,
const SkPath&,
const SkStrokeRec&) 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 GrDrawState* drawState,
const SkPath& path,
const SkMatrix& matrix,
SkIRect* devPathBounds,
SkIRect* devClipBounds) {
// compute bounds as intersection of rt size, clip, and path
const GrRenderTarget* rt = drawState->getRenderTarget();
if (NULL == rt) {
return false;
}
*devPathBounds = SkIRect::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()) {
SkRect pathSBounds;
matrix.mapRect(&pathSBounds, path.getBounds());
SkIRect 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 = SkIRect::EmptyIRect();
return false;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
void draw_around_inv_path(GrDrawTarget* target,
GrDrawState* drawState,
const SkIRect& devClipBounds,
const SkIRect& devPathBounds) {
GrDrawState::AutoViewMatrixRestore avmr;
if (!avmr.setIdentity(drawState)) {
return;
}
SkRect rect;
if (devClipBounds.fTop < devPathBounds.fTop) {
rect.iset(devClipBounds.fLeft, devClipBounds.fTop,
devClipBounds.fRight, devPathBounds.fTop);
target->drawSimpleRect(drawState, rect);
}
if (devClipBounds.fLeft < devPathBounds.fLeft) {
rect.iset(devClipBounds.fLeft, devPathBounds.fTop,
devPathBounds.fLeft, devPathBounds.fBottom);
target->drawSimpleRect(drawState, rect);
}
if (devClipBounds.fRight > devPathBounds.fRight) {
rect.iset(devPathBounds.fRight, devPathBounds.fTop,
devClipBounds.fRight, devPathBounds.fBottom);
target->drawSimpleRect(drawState, rect);
}
if (devClipBounds.fBottom > devPathBounds.fBottom) {
rect.iset(devClipBounds.fLeft, devPathBounds.fBottom,
devClipBounds.fRight, devClipBounds.fBottom);
target->drawSimpleRect(drawState, rect);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(GrDrawTarget* target,
GrDrawState* drawState,
const SkPath& path,
const SkStrokeRec& stroke,
bool antiAlias) {
if (NULL == fContext) {
return false;
}
SkMatrix vm = drawState->getViewMatrix();
SkIRect devPathBounds, devClipBounds;
if (!get_path_and_clip_bounds(target, drawState, path, vm,
&devPathBounds, &devClipBounds)) {
if (path.isInverseFillType()) {
draw_around_inv_path(target, drawState, devClipBounds, devPathBounds);
}
return true;
}
SkAutoTUnref<GrTexture> texture(
GrSWMaskHelper::DrawPathMaskToTexture(fContext, path, stroke,
devPathBounds,
antiAlias, &vm));
if (NULL == texture) {
return false;
}
GrDrawState copy = *drawState;
GrSWMaskHelper::DrawToTargetWithPathMask(texture, target, ©, devPathBounds);
if (path.isInverseFillType()) {
draw_around_inv_path(target, drawState, devClipBounds, devPathBounds);
}
return true;
}
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