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* Copyright 2006 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkScanPriv_DEFINED
#define SkScanPriv_DEFINED
#include "include/core/SkPath.h"
#include "src/core/SkBlitter.h"
#include "src/core/SkScan.h"
// controls how much we super-sample (when we use that scan convertion)
class SkScanClipper {
SkScanClipper(SkBlitter* blitter, const SkRegion* clip, const SkIRect& bounds,
bool skipRejectTest = false, bool boundsPreClipped = false);
SkBlitter* getBlitter() const { return fBlitter; }
const SkIRect* getClipRect() const { return fClipRect; }
SkRectClipBlitter fRectBlitter;
SkRgnClipBlitter fRgnBlitter;
#ifdef SK_DEBUG
SkRectClipCheckBlitter fRectClipCheckBlitter;
SkBlitter* fBlitter;
const SkIRect* fClipRect;
void sk_fill_path(const SkPath& path, const SkIRect& clipRect,
SkBlitter* blitter, int start_y, int stop_y, int shiftEdgesUp,
bool pathContainedInClip);
// blit the rects above and below avoid, clipped to clip
void sk_blit_above(SkBlitter*, const SkIRect& avoid, const SkRegion& clip);
void sk_blit_below(SkBlitter*, const SkIRect& avoid, const SkRegion& clip);
template<class EdgeType>
static inline void remove_edge(EdgeType* edge) {
edge->fPrev->fNext = edge->fNext;
edge->fNext->fPrev = edge->fPrev;
template<class EdgeType>
static inline void insert_edge_after(EdgeType* edge, EdgeType* afterMe) {
edge->fPrev = afterMe;
edge->fNext = afterMe->fNext;
afterMe->fNext->fPrev = edge;
afterMe->fNext = edge;
template<class EdgeType>
static void backward_insert_edge_based_on_x(EdgeType* edge) {
SkFixed x = edge->fX;
EdgeType* prev = edge->fPrev;
while (prev->fPrev && prev->fX > x) {
prev = prev->fPrev;
if (prev->fNext != edge) {
insert_edge_after(edge, prev);
// Start from the right side, searching backwards for the point to begin the new edge list
// insertion, marching forwards from here. The implementation could have started from the left
// of the prior insertion, and search to the right, or with some additional caching, binary
// search the starting point. More work could be done to determine optimal new edge insertion.
template<class EdgeType>
static EdgeType* backward_insert_start(EdgeType* prev, SkFixed x) {
while (prev->fPrev && prev->fX > x) {
prev = prev->fPrev;
return prev;
// Check if the path is a rect and fat enough after clipping; if so, blit it.
static inline bool TryBlitFatAntiRect(SkBlitter* blitter, const SkPath& path, const SkIRect& clip) {
SkRect rect;
if (!path.isRect(&rect)) {
return false; // not rect
if (!rect.intersect(SkRect::Make(clip))) {
return true; // The intersection is empty. Hence consider it done.
SkIRect bounds = rect.roundOut();
if (bounds.width() < 3) {
return false; // not fat
return true;