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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 GrVec* translate,
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 GrClip& clip = target->getClip();
if (clip.hasConservativeBounds()) {
clip.getConservativeBounds().roundOut(clipBounds);
if (!pathBounds->intersect(*clipBounds)) {
return false;
}
} else {
// pathBounds is currently the rt extent, set clip bounds to that rect.
*clipBounds = *pathBounds;
}
GrRect pathSBounds = path.getBounds();
if (!pathSBounds.isEmpty()) {
if (NULL != translate) {
pathSBounds.offset(*translate);
}
target->getDrawState().getViewMatrix().mapRect(&pathSBounds,
pathSBounds);
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;
}
////////////////////////////////////////////////////////////////////////////////
/**
* sw rasterizes path to A8 mask using the context's matrix and uploads to a
* scratch texture.
*/
bool sw_draw_path_to_mask_texture(const SkPath& clientPath,
const GrIRect& pathDevBounds,
GrPathFill fill,
GrContext* context,
const GrPoint* translate,
GrAutoScratchTexture* tex,
bool antiAlias) {
GrSWMaskHelper helper(context);
if (!helper.init(pathDevBounds, translate, true)) {
return false;
}
helper.draw(clientPath, SkRegion::kReplace_Op,
fill, antiAlias, SK_ColorWHITE);
if (!helper.getTexture(tex)) {
return false;
}
helper.toTexture(tex->texture(), false);
return true;
}
////////////////////////////////////////////////////////////////////////////////
void draw_around_inv_path(GrDrawTarget* target,
GrDrawState::StageMask stageMask,
const GrIRect& clipBounds,
const GrIRect& pathBounds) {
GrDrawTarget::AutoDeviceCoordDraw adcd(target, stageMask);
GrRect rect;
if (clipBounds.fTop < pathBounds.fTop) {
rect.iset(clipBounds.fLeft, clipBounds.fTop,
clipBounds.fRight, pathBounds.fTop);
target->drawSimpleRect(rect, NULL, stageMask);
}
if (clipBounds.fLeft < pathBounds.fLeft) {
rect.iset(clipBounds.fLeft, pathBounds.fTop,
pathBounds.fLeft, pathBounds.fBottom);
target->drawSimpleRect(rect, NULL, stageMask);
}
if (clipBounds.fRight > pathBounds.fRight) {
rect.iset(pathBounds.fRight, pathBounds.fTop,
clipBounds.fRight, pathBounds.fBottom);
target->drawSimpleRect(rect, NULL, stageMask);
}
if (clipBounds.fBottom > pathBounds.fBottom) {
rect.iset(clipBounds.fLeft, pathBounds.fBottom,
clipBounds.fRight, clipBounds.fBottom);
target->drawSimpleRect(rect, NULL, stageMask);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
const GrVec* translate,
GrDrawTarget* target,
GrDrawState::StageMask stageMask,
bool antiAlias) {
if (NULL == fContext) {
return false;
}
GrAutoScratchTexture ast;
GrIRect pathBounds, clipBounds;
if (!get_path_and_clip_bounds(target, path, translate,
&pathBounds, &clipBounds)) {
if (GrIsFillInverted(fill)) {
draw_around_inv_path(target, stageMask,
clipBounds, pathBounds);
}
return true;
}
if (sw_draw_path_to_mask_texture(path, pathBounds,
fill, fContext,
translate, &ast, antiAlias)) {
SkAutoTUnref<GrTexture> texture(ast.detach());
GrAssert(NULL != texture);
GrDrawTarget::AutoDeviceCoordDraw adcd(target, stageMask);
enum {
// the SW path renderer shares this stage with glyph
// rendering (kGlyphMaskStage in GrBatchedTextContext)
kPathMaskStage = GrPaint::kTotalStages,
};
GrAssert(NULL == target->drawState()->getTexture(kPathMaskStage));
target->drawState()->setTexture(kPathMaskStage, texture);
target->drawState()->sampler(kPathMaskStage)->reset();
GrScalar w = GrIntToScalar(pathBounds.width());
GrScalar h = GrIntToScalar(pathBounds.height());
GrRect maskRect = GrRect::MakeWH(w / texture->width(),
h / texture->height());
const GrRect* srcRects[GrDrawState::kNumStages] = {NULL};
srcRects[kPathMaskStage] = &maskRect;
stageMask |= 1 << kPathMaskStage;
GrRect dstRect = GrRect::MakeLTRB(
SK_Scalar1* pathBounds.fLeft,
SK_Scalar1* pathBounds.fTop,
SK_Scalar1* pathBounds.fRight,
SK_Scalar1* pathBounds.fBottom);
target->drawRect(dstRect, NULL, stageMask, srcRects, NULL);
target->drawState()->setTexture(kPathMaskStage, NULL);
if (GrIsFillInverted(fill)) {
draw_around_inv_path(target, stageMask,
clipBounds, pathBounds);
}
return true;
}
return false;
}
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