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* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef skgpu_RectanizerSkyline_DEFINED
#define skgpu_RectanizerSkyline_DEFINED
#include "include/private/base/SkTDArray.h"
#include "src/gpu/Rectanizer.h"
namespace skgpu {
// Pack rectangles and track the current silhouette
// Based, in part, on Jukka Jylanki's work at
// Mark this class final in an effort to avoid the vtable when this subclass is used explicitly.
class RectanizerSkyline final : public Rectanizer {
RectanizerSkyline(int w, int h) : Rectanizer(w, h) {
~RectanizerSkyline() final { }
void reset() final {
fAreaSoFar = 0;
fSkyline.push_back(SkylineSegment{0, 0, this->width()});
bool addRect(int w, int h, SkIPoint16* loc) final;
float percentFull() const final {
return fAreaSoFar / ((float)this->width() * this->height());
struct SkylineSegment {
int fX;
int fY;
int fWidth;
SkTDArray<SkylineSegment> fSkyline;
int32_t fAreaSoFar;
// Can a width x height rectangle fit in the free space represented by
// the skyline segments >= 'skylineIndex'? If so, return true and fill in
// 'y' with the y-location at which it fits (the x location is pulled from
// 'skylineIndex's segment.
bool rectangleFits(int skylineIndex, int width, int height, int* y) const;
// Update the skyline structure to include a width x height rect located
// at x,y.
void addSkylineLevel(int skylineIndex, int x, int y, int width, int height);
} // End of namespace skgpu