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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"
#include "GrVertexBuffer.h"
////////////////////////////////////////////////////////////////////////////////
bool GrSoftwarePathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const {
if (NULL == fContext) {
return false;
}
if (args.fStroke->isDashed()) {
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 GrPipelineBuilder* pipelineBuilder,
const SkPath& path,
const SkMatrix& matrix,
SkIRect* devPathBounds,
SkIRect* devClipBounds) {
// compute bounds as intersection of rt size, clip, and path
const GrRenderTarget* rt = pipelineBuilder->getRenderTarget();
if (NULL == rt) {
return false;
}
pipelineBuilder->clip().getConservativeBounds(rt, devClipBounds);
if (devClipBounds->isEmpty()) {
*devPathBounds = SkIRect::MakeWH(rt->width(), rt->height());
return false;
}
if (!path.getBounds().isEmpty()) {
SkRect pathSBounds;
matrix.mapRect(&pathSBounds, path.getBounds());
SkIRect pathIBounds;
pathSBounds.roundOut(&pathIBounds);
*devPathBounds = *devClipBounds;
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,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkIRect& devClipBounds,
const SkIRect& devPathBounds) {
SkMatrix invert;
if (!viewMatrix.invert(&invert)) {
return;
}
SkRect rect;
if (devClipBounds.fTop < devPathBounds.fTop) {
rect.iset(devClipBounds.fLeft, devClipBounds.fTop,
devClipBounds.fRight, devPathBounds.fTop);
target->drawNonAARect(*pipelineBuilder, color, SkMatrix::I(), rect, invert);
}
if (devClipBounds.fLeft < devPathBounds.fLeft) {
rect.iset(devClipBounds.fLeft, devPathBounds.fTop,
devPathBounds.fLeft, devPathBounds.fBottom);
target->drawNonAARect(*pipelineBuilder, color, SkMatrix::I(), rect, invert);
}
if (devClipBounds.fRight > devPathBounds.fRight) {
rect.iset(devPathBounds.fRight, devPathBounds.fTop,
devClipBounds.fRight, devPathBounds.fBottom);
target->drawNonAARect(*pipelineBuilder, color, SkMatrix::I(), rect, invert);
}
if (devClipBounds.fBottom > devPathBounds.fBottom) {
rect.iset(devClipBounds.fLeft, devPathBounds.fBottom,
devClipBounds.fRight, devClipBounds.fBottom);
target->drawNonAARect(*pipelineBuilder, color, SkMatrix::I(), rect, invert);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const DrawPathArgs& args) {
if (NULL == fContext) {
return false;
}
SkIRect devPathBounds, devClipBounds;
if (!get_path_and_clip_bounds(args.fTarget, args.fPipelineBuilder, *args.fPath,
*args.fViewMatrix, &devPathBounds, &devClipBounds)) {
if (args.fPath->isInverseFillType()) {
draw_around_inv_path(args.fTarget, args.fPipelineBuilder, args.fColor,
*args.fViewMatrix, devClipBounds, devPathBounds);
}
return true;
}
SkAutoTUnref<GrTexture> texture(
GrSWMaskHelper::DrawPathMaskToTexture(fContext, *args.fPath, *args.fStroke,
devPathBounds,
args.fAntiAlias, args.fViewMatrix));
if (NULL == texture) {
return false;
}
GrSWMaskHelper::DrawToTargetWithPathMask(texture, args.fTarget, args.fPipelineBuilder,
args.fColor, *args.fViewMatrix, devPathBounds);
if (args.fPath->isInverseFillType()) {
draw_around_inv_path(args.fTarget, args.fPipelineBuilder, args.fColor, *args.fViewMatrix,
devClipBounds, devPathBounds);
}
return true;
}
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