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498 lines
12 KiB
C++
498 lines
12 KiB
C++
/*
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** pcxtexture.cpp
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** Texture class for PCX images
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**
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**---------------------------------------------------------------------------
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** Copyright 2005 David HENRY
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** Copyright 2006-2019 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 "basics.h"
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#include "files.h"
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#include "bitmap.h"
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#include "imagehelpers.h"
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#include "image.h"
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#include "filesystem.h"
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//==========================================================================
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//
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// PCX file header
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//
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//==========================================================================
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#pragma pack(1)
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struct PCXHeader
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{
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uint8_t manufacturer;
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uint8_t version;
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uint8_t encoding;
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uint8_t bitsPerPixel;
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uint16_t xmin, ymin;
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uint16_t xmax, ymax;
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uint16_t horzRes, vertRes;
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uint8_t palette[48];
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uint8_t reserved;
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uint8_t numColorPlanes;
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uint16_t bytesPerScanLine;
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uint16_t paletteType;
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uint16_t horzSize, vertSize;
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uint8_t padding[54];
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} FORCE_PACKED;
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#pragma pack()
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//==========================================================================
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//
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// a PCX texture
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//
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//==========================================================================
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class FPCXTexture : public FImageSource
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{
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public:
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FPCXTexture (PCXHeader &);
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int CopyPixels(FBitmap *bmp, int conversion) override;
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protected:
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void ReadPCX1bit (uint8_t *dst, FileReader & lump, PCXHeader *hdr);
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void ReadPCX4bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr);
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void ReadPCX8bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr);
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void ReadPCX24bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr, int planes);
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void CreatePalettedPixels(uint8_t *destbuffer) override;
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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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FImageSource * PCXImage_TryCreate(FileReader & file)
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{
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PCXHeader hdr;
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file.Seek(0, FileReader::SeekSet);
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if (file.Read(&hdr, sizeof(hdr)) != sizeof(hdr))
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{
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return NULL;
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}
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hdr.xmin = LittleShort(hdr.xmin);
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hdr.xmax = LittleShort(hdr.xmax);
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hdr.bytesPerScanLine = LittleShort(hdr.bytesPerScanLine);
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if (hdr.manufacturer != 10 || hdr.encoding != 1) return NULL;
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if (hdr.version != 0 && hdr.version != 2 && hdr.version != 3 && hdr.version != 4 && hdr.version != 5) return NULL;
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if (hdr.bitsPerPixel != 1 && hdr.bitsPerPixel != 8 && hdr.bitsPerPixel != 4) return NULL;
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if (hdr.bitsPerPixel == 1 && hdr.numColorPlanes !=1 && hdr.numColorPlanes != 4) return NULL;
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if (hdr.bitsPerPixel == 8 && hdr.bytesPerScanLine != ((hdr.xmax - hdr.xmin + 2)&~1)) return NULL;
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for (int i = 0; i < 54; i++)
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{
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if (hdr.padding[i] != 0) return NULL;
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}
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file.Seek(0, FileReader::SeekSet);
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file.Read(&hdr, sizeof(hdr));
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return new FPCXTexture(hdr);
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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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FPCXTexture::FPCXTexture(PCXHeader & hdr)
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{
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bMasked = false;
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Width = LittleShort(hdr.xmax) - LittleShort(hdr.xmin) + 1;
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Height = LittleShort(hdr.ymax) - LittleShort(hdr.ymin) + 1;
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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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void FPCXTexture::ReadPCX1bit (uint8_t *dst, FileReader & lump, PCXHeader *hdr)
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{
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int y, i, bytes;
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int rle_count = 0;
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uint8_t rle_value = 0;
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TArray<uint8_t> srcp = lump.Read(lump.GetLength() - sizeof(PCXHeader));
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uint8_t * src = srcp.Data();
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for (y = 0; y < Height; ++y)
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{
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uint8_t * ptr = &dst[y * Width];
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bytes = hdr->bytesPerScanLine;
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while (bytes--)
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{
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if (rle_count == 0)
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{
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if ( (rle_value = *src++) < 0xc0)
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{
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rle_count = 1;
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}
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else
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{
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rle_count = rle_value - 0xc0;
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rle_value = *src++;
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}
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}
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rle_count--;
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for (i = 7; i >= 0; --i, ptr ++)
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{
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// This can overflow for the last byte if not checked.
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if (ptr < dst+Width*Height)
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*ptr = ((rle_value & (1 << i)) > 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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//
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//
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//==========================================================================
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void FPCXTexture::ReadPCX4bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr)
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{
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int rle_count = 0, rle_value = 0;
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int x, y, c;
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int bytes;
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TArray<uint8_t> line(hdr->bytesPerScanLine, true);
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TArray<uint8_t> colorIndex(Width, true);
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TArray<uint8_t> srcp = lump.Read(lump.GetLength() - sizeof(PCXHeader));
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uint8_t * src = srcp.Data();
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for (y = 0; y < Height; ++y)
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{
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uint8_t * ptr = &dst[y * Width];
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memset (ptr, 0, Width * sizeof (uint8_t));
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for (c = 0; c < 4; ++c)
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{
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uint8_t * pLine = line.Data();
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bytes = hdr->bytesPerScanLine;
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while (bytes--)
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{
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if (rle_count == 0)
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{
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if ( (rle_value = *src++) < 0xc0)
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{
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rle_count = 1;
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}
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else
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{
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rle_count = rle_value - 0xc0;
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rle_value = *src++;
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}
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}
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rle_count--;
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*(pLine++) = rle_value;
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}
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}
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/* compute line's color indexes */
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for (x = 0; x < Width; ++x)
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{
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if (line[x / 8] & (128 >> (x % 8)))
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ptr[x] += (1 << c);
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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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//
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//==========================================================================
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void FPCXTexture::ReadPCX8bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr)
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{
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int rle_count = 0, rle_value = 0;
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int y, bytes;
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auto srcp = lump.Read(lump.GetLength() - sizeof(PCXHeader));
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uint8_t * src = srcp.Data();
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for (y = 0; y < Height; ++y)
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{
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uint8_t * ptr = &dst[y * Width];
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bytes = hdr->bytesPerScanLine;
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while (bytes--)
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{
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if (rle_count == 0)
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{
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if( (rle_value = *src++) < 0xc0)
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{
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rle_count = 1;
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}
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else
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{
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rle_count = rle_value - 0xc0;
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rle_value = *src++;
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}
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}
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rle_count--;
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*ptr++ = rle_value;
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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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//
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//==========================================================================
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void FPCXTexture::ReadPCX24bits (uint8_t *dst, FileReader & lump, PCXHeader *hdr, int planes)
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{
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int rle_count = 0, rle_value = 0;
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int y, c;
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int bytes;
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auto srcp = lump.Read(lump.GetLength() - sizeof(PCXHeader));
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uint8_t * src = srcp.Data();
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for (y = 0; y < Height; ++y)
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{
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/* for each color plane */
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for (c = 0; c < planes; ++c)
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{
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uint8_t * ptr = &dst[y * Width * planes];
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bytes = hdr->bytesPerScanLine;
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while (bytes--)
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{
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if (rle_count == 0)
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{
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if( (rle_value = *src++) < 0xc0)
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{
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rle_count = 1;
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}
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else
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{
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rle_count = rle_value - 0xc0;
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rle_value = *src++;
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}
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}
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rle_count--;
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ptr[c] = (uint8_t)rle_value;
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ptr += planes;
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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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//
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//
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//==========================================================================
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void FPCXTexture::CreatePalettedPixels(uint8_t *buffer)
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{
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uint8_t PaletteMap[256];
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PCXHeader header;
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int bitcount;
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auto lump = fileSystem.OpenFileReader(Name);
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if (!lump.isOpen()) return; // Just leave the texture blank.
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lump.Read(&header, sizeof(header));
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bitcount = header.bitsPerPixel * header.numColorPlanes;
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if (bitcount < 24)
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{
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if (bitcount < 8)
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{
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switch (bitcount)
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{
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default:
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case 1:
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PaletteMap[0] = ImageHelpers::GrayMap[0];
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PaletteMap[1] = ImageHelpers::GrayMap[255];
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ReadPCX1bit (buffer, lump, &header);
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break;
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case 4:
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for (int i = 0; i < 16; i++)
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{
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PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(false, header.palette[i * 3], header.palette[i * 3 + 1], header.palette[i * 3 + 2]);
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}
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ReadPCX4bits (buffer, lump, &header);
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break;
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}
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}
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else if (bitcount == 8)
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{
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lump.Seek(-769, FileReader::SeekEnd);
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uint8_t c = lump.ReadUInt8();
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//if (c !=0x0c) memcpy(PaletteMap, GrayMap, 256); // Fallback for files without palette
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//else
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for(int i=0;i<256;i++)
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{
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uint8_t r = lump.ReadUInt8();
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uint8_t g = lump.ReadUInt8();
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uint8_t b = lump.ReadUInt8();
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PaletteMap[i] = ImageHelpers::RGBToPalettePrecise(false, r, g, b);
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}
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lump.Seek(sizeof(header), FileReader::SeekSet);
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ReadPCX8bits (buffer, lump, &header);
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}
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if (Width == Height)
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{
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ImageHelpers::FlipSquareBlockRemap(buffer, Width, PaletteMap);
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}
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else
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{
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TArray<uint8_t> newpix(Width*Height, true);
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ImageHelpers::FlipNonSquareBlockRemap (newpix.Data(), buffer, Width, Height, Width, PaletteMap);
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}
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}
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else
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{
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TArray<uint8_t> buffer(Width*Height * 3, true);
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uint8_t * row = buffer.Data();
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ReadPCX24bits (row, lump, &header, 3);
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for(int y=0; y<Height; y++)
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{
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for(int x=0; x < Width; x++)
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{
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buffer[y + Height * x] = ImageHelpers::RGBToPalette(false, row[0], row[1], row[2]);
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row+=3;
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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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// FPCXTexture::CopyPixels
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//
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// Preserves the full color information (unlike software mode)
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//
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//===========================================================================
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int FPCXTexture::CopyPixels(FBitmap *bmp, int conversion)
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{
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PalEntry pe[256];
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PCXHeader header;
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int bitcount;
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TArray<uint8_t> Pixels;
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auto lump = fileSystem.OpenFileReader(Name);
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if (!lump.isOpen()) return -1; // Just leave the texture blank.
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lump.Read(&header, sizeof(header));
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bitcount = header.bitsPerPixel * header.numColorPlanes;
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if (bitcount < 24)
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{
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Pixels.Resize(Width*Height);
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if (bitcount < 8)
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{
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switch (bitcount)
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{
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default:
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case 1:
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pe[0] = PalEntry(255, 0, 0, 0);
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pe[1] = PalEntry(255, 255, 255, 255);
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ReadPCX1bit (Pixels.Data(), lump, &header);
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break;
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case 4:
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for (int i = 0; i<16; i++)
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{
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pe[i] = PalEntry(255, header.palette[i * 3], header.palette[i * 3 + 1], header.palette[i * 3 + 2]);
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}
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ReadPCX4bits (Pixels.Data(), lump, &header);
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break;
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}
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}
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else if (bitcount == 8)
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{
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lump.Seek(-769, FileReader::SeekEnd);
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uint8_t c = lump.ReadUInt8();
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c=0x0c; // Apparently there's many non-compliant PCXs out there...
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if (c !=0x0c)
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{
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for(int i=0;i<256;i++) pe[i]=PalEntry(255,i,i,i); // default to a gray map
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}
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else for(int i=0;i<256;i++)
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{
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uint8_t r = lump.ReadUInt8();
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uint8_t g = lump.ReadUInt8();
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uint8_t b = lump.ReadUInt8();
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pe[i] = PalEntry(255, r,g,b);
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}
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lump.Seek(sizeof(header), FileReader::SeekSet);
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ReadPCX8bits (Pixels.Data(), lump, &header);
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}
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bmp->CopyPixelData(0, 0, Pixels.Data(), Width, Height, 1, Width, 0, pe);
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}
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else
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{
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Pixels.Resize(Width*Height*4);
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ReadPCX24bits (Pixels.Data(), lump, &header, 3);
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bmp->CopyPixelDataRGB(0, 0, Pixels.Data(), Width, Height, 3, Width*3, 0, CF_RGB);
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}
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return 0;
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}
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