mirror of
https://github.com/ZDoom/qzdoom.git
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125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
/*
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** flattexture.cpp
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** Texture class for empty placeholder textures
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** (essentially patches with dimensions and offsets of (0,0) )
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**
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**---------------------------------------------------------------------------
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** Copyright 2009 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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**
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*/
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#include "doomtype.h"
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#include "files.h"
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#include "w_wad.h"
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#include "textures/textures.h"
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//==========================================================================
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//
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// A texture defined between F_START and F_END markers
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//
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//==========================================================================
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class FEmptyTexture : public FTexture
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{
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public:
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FEmptyTexture (int lumpnum);
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const BYTE *GetColumn (unsigned int column, const Span **spans_out);
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const BYTE *GetPixels ();
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void Unload() {}
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protected:
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BYTE Pixels[1];
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Span DummySpans[1];
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};
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//==========================================================================
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//
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// Since there is no way to detect the validity of a flat
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// they can't be used anywhere else but between F_START and F_END
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//
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//==========================================================================
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FTexture *EmptyTexture_TryCreate(FileReader & file, int lumpnum)
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{
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char check[8];
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if (file.GetLength() != 8) return NULL;
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file.Seek(0, SEEK_SET);
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if (file.Read(check, 8) != 8) return NULL;
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if (memcmp(check, "\0\0\0\0\0\0\0\0", 8)) return NULL;
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return new FEmptyTexture(lumpnum);
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FEmptyTexture::FEmptyTexture (int lumpnum)
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: FTexture(NULL, lumpnum)
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{
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bMasked = true;
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WidthBits = HeightBits = 1;
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Width = Height = 1;
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WidthMask = 0;
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DummySpans[0].TopOffset = 0;
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DummySpans[0].Length = 0;
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Pixels[0] = 0;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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const BYTE *FEmptyTexture::GetColumn (unsigned int column, const Span **spans_out)
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{
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if (spans_out != NULL)
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{
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*spans_out = DummySpans;
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}
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return Pixels;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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const BYTE *FEmptyTexture::GetPixels ()
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{
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return Pixels;
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}
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