vcl/opengl/FixedTextureAtlas.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <sal/config.h>
  12 #include <vcl/opengl/OpenGLContext.hxx>
  13 #include <vcl/opengl/OpenGLHelper.hxx>
  14
  15 #include "opengl/framebuffer.hxx"
  16 #include "opengl/texture.hxx"
  17
  18 #include "opengl/FixedTextureAtlas.hxx"
  19
  20 FixedTextureAtlasManager::FixedTextureAtlasManager(int nWidthFactor, int nHeightFactor, int nSubTextureSize)
  21     : mWidthFactor(nWidthFactor)
  22     , mHeightFactor(nHeightFactor)
  23     , mSubTextureSize(nSubTextureSize)
  24 {
  25 }
  26
  27 void FixedTextureAtlasManager::CreateNewTexture()
  28 {
  29     int nTextureWidth = mWidthFactor  * mSubTextureSize;
  30     int nTextureHeight = mHeightFactor * mSubTextureSize;
  31     mpTextures.push_back(std::move(std::unique_ptr<ImplOpenGLTexture>(new ImplOpenGLTexture(nTextureWidth, nTextureHeight, true))));
  32     mpTextures.back()->InitializeSlots(mWidthFactor * mHeightFactor);
  33 }
  34
  35 OpenGLTexture FixedTextureAtlasManager::InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8* pData)
  36 {
  37     ImplOpenGLTexture* pTexture = nullptr;
  38
  39     auto funFreeSlot = [] (std::unique_ptr<ImplOpenGLTexture>& mpTexture)
  40     {
  41         return mpTexture->mnFreeSlots > 0;
  42     };
  43
  44     auto aIterator = std::find_if(mpTextures.begin(), mpTextures.end(), funFreeSlot);
  45
  46     if (aIterator != mpTextures.end())
  47     {
  48         pTexture = (*aIterator).get();
  49     }
  50     else
  51     {
  52         CreateNewTexture();
  53         pTexture = mpTextures.back().get();
  54     }
  55
  56     int nSlot = pTexture->FindFreeSlot();
  57
  58     // Calculate coordinates in texture
  59     int nX = (nSlot % mWidthFactor) * mSubTextureSize;
  60     int nY = (nSlot / mWidthFactor) * mSubTextureSize;
  61
  62     Rectangle aRectangle(Point(nX, nY), Size(nWidth, nHeight));
  63
  64     // If available, copy the image data to the texture
  65     if (pData)
  66     {
  67         if (!pTexture->InsertBuffer(nX, nY, nWidth, nHeight, nFormat, nType, pData))
  68             return OpenGLTexture();
  69     }
  70
  71     return OpenGLTexture(pTexture, aRectangle, nSlot);
  72 }
  73
  74 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */