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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/.
*
*/
#include <sal/config.h>
#include <vcl/opengl/OpenGLContext.hxx>
#include <vcl/opengl/OpenGLHelper.hxx>
#include "opengl/framebuffer.hxx"
#include "opengl/texture.hxx"
#include "opengl/PackedTextureAtlas.hxx"
struct Node
{
Rectangle mRectangle;
std::unique_ptr<Node> mLeftNode;
std::unique_ptr<Node> mRightNode;
bool mOccupied;
Node(Rectangle& aRectangle);
bool isLeaf();
Node* insert(int nWidth, int nHeight, int nPadding);
};
Node::Node(Rectangle& aRectangle)
: mRectangle(aRectangle)
, mLeftNode()
, mRightNode()
, mOccupied(false)
{}
bool Node::isLeaf()
{
return mLeftNode.get() == nullptr &&
mRightNode.get() == nullptr;
}
Node* Node::insert(int nWidth, int nHeight, int nPadding)
{
if (!isLeaf())
{
Node* pNewNode = mLeftNode->insert(nWidth, nHeight, nPadding);
if (pNewNode != nullptr)
return pNewNode;
return mRightNode->insert(nWidth, nHeight, nPadding);
}
else
{
if (mOccupied)
{
return nullptr;
}
if (nWidth > mRectangle.GetWidth() || nHeight > mRectangle.GetHeight())
{ // does not fit
return nullptr;
}
if (nWidth == mRectangle.GetWidth() && nHeight == mRectangle.GetHeight())
{ // perfect fit
mOccupied = true;
return this;
}
int dw = mRectangle.GetWidth() - nWidth;
int dh = mRectangle.GetHeight() - nHeight;
Rectangle aLeftRect;
Rectangle aRightRect;
if (dw > dh)
{
aLeftRect = Rectangle(Point(mRectangle.Left(), mRectangle.Top()),
Size(nWidth, mRectangle.GetHeight()));
aRightRect = Rectangle(Point(nPadding + mRectangle.Left() + nWidth, mRectangle.Top()),
Size(mRectangle.GetWidth() - nWidth - nPadding, mRectangle.GetHeight()));
}
else
{
aLeftRect = Rectangle(Point(mRectangle.Left(), mRectangle.Top()),
Size(mRectangle.GetWidth(), nHeight));
aRightRect = Rectangle(Point(mRectangle.Left(), nPadding + mRectangle.Top() + nHeight),
Size(mRectangle.GetWidth(), mRectangle.GetHeight() - nHeight - nPadding));
}
mLeftNode.reset(new Node(aLeftRect));
mRightNode.reset(new Node(aRightRect));
return mLeftNode->insert(nWidth, nHeight, nPadding);
}
}
struct PackedTexture
{
std::unique_ptr<Node> mpRootNode;
ImplOpenGLTexture* mpTexture;
};
PackedTextureAtlasManager::PackedTextureAtlasManager(int nTextureWidth, int nTextureHeight)
: mnTextureWidth(nTextureWidth)
, mnTextureHeight(nTextureHeight)
{
}
PackedTextureAtlasManager::~PackedTextureAtlasManager()
{
for (std::unique_ptr<PackedTexture>& pPackedTexture : maPackedTextures)
{
// Free texture early in VCL shutdown while we have a context.
pPackedTexture->mpTexture->Dispose();
pPackedTexture->mpTexture->DecreaseRefCount(0);
}
}
void PackedTextureAtlasManager::CreateNewTexture()
{
std::unique_ptr<PackedTexture> pPackedTexture(new PackedTexture);
pPackedTexture->mpTexture = new ImplOpenGLTexture(mnTextureWidth, mnTextureHeight, true);
Rectangle aInitialRect(Point(0, 0), Size(mnTextureWidth, mnTextureHeight));
pPackedTexture->mpRootNode.reset(new Node(aInitialRect));
maPackedTextures.push_back(std::move(pPackedTexture));
}
OpenGLTexture PackedTextureAtlasManager::Reserve(int nWidth, int nHeight)
{
for (std::unique_ptr<PackedTexture>& pPackedTexture : maPackedTextures)
{
Node* pNode = pPackedTexture->mpRootNode->insert(nWidth, nHeight, 1);
if (pNode != nullptr)
{
return OpenGLTexture(pPackedTexture->mpTexture, pNode->mRectangle, -1);
}
}
CreateNewTexture();
std::unique_ptr<PackedTexture>& pPackedTexture = maPackedTextures.back();
Node* pNode = pPackedTexture->mpRootNode->insert(nWidth, nHeight, 1);
if (pNode != nullptr)
{
return OpenGLTexture(pPackedTexture->mpTexture, pNode->mRectangle, -1);
}
return OpenGLTexture();
}
OpenGLTexture PackedTextureAtlasManager::InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8* pData)
{
OpenGLTexture aTexture = Reserve(nWidth, nHeight);
if (aTexture && pData == nullptr)
return aTexture;
aTexture.CopyData(nWidth, nHeight, nFormat, nType, pData);
return aTexture;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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