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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#ifndef INCLUDED_VCL_INC_SKIA_PACKEDSURFACEATLAS_HXX
#define INCLUDED_VCL_INC_SKIA_PACKEDSURFACEATLAS_HXX
#include <memory>
#include <SkSurface.h>
#include <vcl/dllapi.h>
#include <tools/gen.hxx>
/**
* SkSurface that is actually packed in a larger SkSurface atlas.
*
* In Skia's case we draw into SkSurface (as that's what's GPU-backed),
* but then for using the result we need to get an associated SkImage.
* The use of SkSurface::makeImageSnapshot() complicates thingss in two ways:
* - it does data copy if we want a sub-rectangle, so we need to pass a reference
* and the geometry wanted
* - it does a snapshot of the state, meaning any further drawing into the SkSurface
* would detach by creating a copy, so we need to pass around the SkSurface
* reference and then create only a temporary SkImage for the whole SkSurface
* (which should be almost a no-op)
*/
class VCL_DLLPUBLIC SkiaPackedSurface
{
public:
sk_sp<SkSurface> mSurface;
tools::Rectangle mRect; // the area in the surface that is this "surface"
SkiaPackedSurface(const sk_sp<SkSurface>& surface, const tools::Rectangle& rect)
: mSurface(surface)
, mRect(rect)
{
}
SkiaPackedSurface() = default;
};
/**
* Pack Skia "surfaces" into one surface atlas.
*
* This is based on algorithm described in [1] and is an
* adaptation of "texture atlas generator" from [2].
*
* [1]: http://www.blackpawn.com/texts/lightmaps/
* [2]: https://github.com/lukaszdk/texture-atlas-generator
*
*/
class VCL_DLLPUBLIC SkiaPackedSurfaceAtlasManager final
{
struct PackedSurface;
std::vector<std::unique_ptr<PackedSurface>> maPackedSurfaces;
int const mnSurfaceWidth;
int const mnSurfaceHeight;
void CreateNewSurface();
SkiaPackedSurfaceAtlasManager(const SkiaPackedSurfaceAtlasManager&) = delete;
SkiaPackedSurfaceAtlasManager& operator=(const SkiaPackedSurfaceAtlasManager&) = delete;
public:
/**
* nSurfaceWidth and nSurfaceHeight are the dimensions of the common surface(s)
*/
SkiaPackedSurfaceAtlasManager(int nSurfaceWidth, int nSurfaceHeight);
~SkiaPackedSurfaceAtlasManager();
SkiaPackedSurface Reserve(int nWidth, int nHeight);
std::vector<sk_sp<SkSurface>> ReduceSurfaceNumber(int nMaxNumberOfSurfaces);
};
#endif // INCLUDED_VCL_INC_SKIA_PACKEDSURFACEATLAS_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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