X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/56c667557e4df2f4da14c3ef90e80e9fa3cb3ffe..77c8efc8c37da6d6a5e2e8022d21d1cd7d76371d:/src/common/imagpcx.cpp diff --git a/src/common/imagpcx.cpp b/src/common/imagpcx.cpp index f31797bdad..fdbb60c16d 100644 --- a/src/common/imagpcx.cpp +++ b/src/common/imagpcx.cpp @@ -1,64 +1,502 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: imagpcx.cpp +// Name: src/common/imagpcx.cpp // Purpose: wxImage PCX handler // Author: Guillermo Rodriguez Garcia -// Version: 1.00 -// Last rev: 1999/08/24 -// Copyright: (c) Guillermo Rodriguez Garcia +// Version: 1.1 +// CVS-ID: $Id$ +// Copyright: (c) 1999 Guillermo Rodriguez Garcia // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -/* - We don't put pragma implement in this file because it is already present in - src/common/image.cpp -*/ - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop +#endif + +#if wxUSE_IMAGE && wxUSE_PCX + +#ifndef WX_PRECOMP + #include "wx/object.h" + #include "wx/list.h" + #include "wx/log.h" + #include "wx/intl.h" + #include "wx/palette.h" + #include "wx/hash.h" + #include "wx/module.h" #endif -#include "wx/image.h" +#include "wx/imagpcx.h" #include "wx/wfstream.h" -#include "wx/module.h" -#include "wx/log.h" //----------------------------------------------------------------------------- // wxPCXHandler //----------------------------------------------------------------------------- -#if !USE_SHARED_LIBRARIES IMPLEMENT_DYNAMIC_CLASS(wxPCXHandler,wxImageHandler) -#endif #if wxUSE_STREAMS -bool wxPCXHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose ) +//----------------------------------------------------------------------------- +// RLE encoding and decoding +//----------------------------------------------------------------------------- + +void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s) +{ + unsigned int data, last, cont; + + // Write 'size' bytes. The PCX official specs say there will be + // a decoding break at the end of each scanline, so in order to + // force this decoding break use this function to write, at most, + // _one_ complete scanline at a time. + + last = (unsigned char) *(p++); + cont = 1; + size--; + + while (size-- > 0) + { + data = (unsigned char) *(p++); + + // Up to 63 bytes with the same value can be stored using + // a single { cont, value } pair. + // + if ((data == last) && (cont < 63)) + { + cont++; + } + else + { + // need to write a 'counter' byte? + if ((cont > 1) || ((last & 0xC0) == 0xC0)) + s.PutC((char) (cont | 0xC0)); + + s.PutC((char) last); + last = data; + cont = 1; + } + } + + // write the last one and return; + if ((cont > 1) || ((last & 0xC0) == 0xC0)) + s.PutC((char) (cont | 0xC0)); + + s.PutC((char) last); +} + +void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) +{ + // Read 'size' bytes. The PCX official specs say there will be + // a decoding break at the end of each scanline (but not at the + // end of each plane inside a scanline). Only use this function + // to read one or more _complete_ scanlines. Else, more than + // 'size' bytes might be read and the buffer might overflow. + + while (size != 0) + { + unsigned int data = (unsigned char)s.GetC(); + + // If ((data & 0xC0) != 0xC0), then the value read is a data + // byte. Else, it is a counter (cont = val & 0x3F) and the + // next byte is the data byte. + + if ((data & 0xC0) != 0xC0) + { + *(p++) = (unsigned char)data; + size--; + } + else + { + unsigned int cont = data & 0x3F; + if (cont > size) // can happen only if the file is malformed + break; + data = (unsigned char)s.GetC(); + for (unsigned int i = 1; i <= cont; i++) + *(p++) = (unsigned char)data; + size -= cont; + } + } +} + + +//----------------------------------------------------------------------------- +// PCX reading and saving +//----------------------------------------------------------------------------- + +// PCX header +#define HDR_MANUFACTURER 0 +#define HDR_VERSION 1 +#define HDR_ENCODING 2 +#define HDR_BITSPERPIXEL 3 +#define HDR_XMIN 4 +#define HDR_YMIN 6 +#define HDR_XMAX 8 +#define HDR_YMAX 10 +#define HDR_NPLANES 65 +#define HDR_BYTESPERLINE 66 +#define HDR_PALETTEINFO 68 + +// image formats +enum { + wxPCX_8BIT, // 8 bpp, 1 plane (8 bit) + wxPCX_24BIT // 8 bpp, 3 planes (24 bit) +}; + +// error codes +enum { + wxPCX_OK = 0, // everything was OK + wxPCX_INVFORMAT = 1, // error in pcx file format + wxPCX_MEMERR = 2, // error allocating memory + wxPCX_VERERR = 3 // error in pcx version number +}; + + +// ReadPCX: +// Loads a PCX file into the wxImage object pointed by image. +// Returns wxPCX_OK on success, or an error code otherwise +// (see above for error codes) +// +int ReadPCX(wxImage *image, wxInputStream& stream) { + unsigned char hdr[128]; // PCX header + unsigned char pal[768]; // palette for 8 bit images + unsigned char *p; // space to store one scanline + unsigned char *dst; // pointer into wxImage data + unsigned int width, height; // size of the image + unsigned int bytesperline; // bytes per line (each plane) + int bitsperpixel; // bits per pixel (each plane) + int nplanes; // number of planes + int encoding; // is the image RLE encoded? + int format; // image format (8 bit, 24 bit) + unsigned int i, j; + + // Read PCX header and check the version number (it must + // be at least 5 or higher for 8 bit and 24 bit images). + + stream.Read(hdr, 128); + + if (hdr[HDR_VERSION] < 5) return wxPCX_VERERR; + + // Extract all image info from the PCX header. + + encoding = hdr[HDR_ENCODING]; + nplanes = hdr[HDR_NPLANES]; + bitsperpixel = hdr[HDR_BITSPERPIXEL]; + bytesperline = hdr[HDR_BYTESPERLINE] + 256 * hdr[HDR_BYTESPERLINE + 1]; + width = (hdr[HDR_XMAX] + 256 * hdr[HDR_XMAX + 1]) - + (hdr[HDR_XMIN] + 256 * hdr[HDR_XMIN + 1]) + 1; + height = (hdr[HDR_YMAX] + 256 * hdr[HDR_YMAX + 1]) - + (hdr[HDR_YMIN] + 256 * hdr[HDR_YMIN + 1]) + 1; + + // Check image format. Currently supported formats are + // 8 bits (8 bpp, 1 plane) and 24 bits (8 bpp, 3 planes). + + if ((nplanes == 3) && (bitsperpixel == 8)) + format = wxPCX_24BIT; + else if ((nplanes == 1) && (bitsperpixel == 8)) + format = wxPCX_8BIT; + else + return wxPCX_INVFORMAT; + + // If the image is of type wxPCX_8BIT, then there is + // a palette at the end of the image data. If we were + // working with a file, we could seek at the end to the + // end (SeekI(-769, wxFromEnd) and read the palette + // before proceeding. Unfortunately, this would prevent + // loading several PCXs in a single stream, so we can't + // do it. Thus, 8-bit images will have to be decoded in + // two passes: one to read and decode the image data, + // and another to replace 'colour indexes' with RGB + // values. + + // Resize the image and allocate memory for a scanline. + + image->Create(width, height); + + if (!image->IsOk()) + return wxPCX_MEMERR; + + if ((p = (unsigned char *) malloc(bytesperline * nplanes)) == NULL) + return wxPCX_MEMERR; + + // Now start reading the file, line by line, and store + // the data in the format required by wxImage. + + dst = image->GetData(); + + for (j = height; j; j--) + { + if (encoding) + RLEdecode(p, bytesperline * nplanes, stream); + else + stream.Read(p, bytesperline * nplanes); + + switch (format) + { + case wxPCX_8BIT: + { + for (i = 0; i < width; i++) + { + // first pass, just store the colour index + *dst = p[i]; + dst += 3; + } + break; + } + case wxPCX_24BIT: + { + for (i = 0; i < width; i++) + { + *(dst++) = p[i]; + *(dst++) = p[i + bytesperline]; + *(dst++) = p[i + 2 * bytesperline]; + } + break; + } + } + } + + free(p); + + // For 8 bit images, we read the palette, and then do a second + // pass replacing indexes with their RGB values; + + if (format == wxPCX_8BIT) + { + unsigned char index; + + if (stream.GetC() != 12) + return wxPCX_INVFORMAT; + + stream.Read(pal, 768); + + p = image->GetData(); + for (unsigned long k = height * width; k; k--) + { + index = *p; + *(p++) = pal[3 * index]; + *(p++) = pal[3 * index + 1]; + *(p++) = pal[3 * index + 2]; + } + +#if wxUSE_PALETTE + unsigned char r[256]; + unsigned char g[256]; + unsigned char b[256]; + for (i = 0; i < 256; i++) + { + r[i] = pal[3*i + 0]; + g[i] = pal[3*i + 1]; + b[i] = pal[3*i + 2]; + } + image->SetPalette(wxPalette(256, r, g, b)); +#endif // wxUSE_PALETTE + } + + return wxPCX_OK; +} + +// SavePCX: +// Saves a PCX file into the wxImage object pointed by image. +// Returns wxPCX_OK on success, or an error code otherwise +// (see above for error codes). Will try to save as 8-bit +// PCX if possible, and then fall back to 24-bit if there +// are more than 256 different colours. +// +int SavePCX(wxImage *image, wxOutputStream& stream) +{ + unsigned char hdr[128]; // PCX header + unsigned char pal[768]; // palette for 8 bit images + unsigned char *p; // space to store one scanline + unsigned char *src; // pointer into wxImage data + unsigned int width, height; // size of the image + unsigned int bytesperline; // bytes per line (each plane) + unsigned char nplanes = 3; // number of planes + int format = wxPCX_24BIT; // image format (8 bit, 24 bit) + wxImageHistogram histogram; // image histogram + unsigned long key; // key in the hashtable + unsigned int i; + + // See if we can save as 8 bit. + + if (image->CountColours(256) <= 256) + { + image->ComputeHistogram(histogram); + format = wxPCX_8BIT; + nplanes = 1; + } + + // Get image dimensions, calculate bytesperline (must be even, + // according to PCX specs) and allocate space for one complete + // scanline. + + if (!image->IsOk()) + return wxPCX_INVFORMAT; + + width = image->GetWidth(); + height = image->GetHeight(); + bytesperline = width; + if (bytesperline % 2) + bytesperline++; + + if ((p = (unsigned char *) malloc(bytesperline * nplanes)) == NULL) + return wxPCX_MEMERR; + + // Build header data and write it to the stream. Initially, + // set all bytes to zero (most values default to zero). + + memset(hdr, 0, sizeof(hdr)); + + hdr[HDR_MANUFACTURER] = 10; + hdr[HDR_VERSION] = 5; + hdr[HDR_ENCODING] = 1; + hdr[HDR_NPLANES] = nplanes; + hdr[HDR_BITSPERPIXEL] = 8; + hdr[HDR_BYTESPERLINE] = (unsigned char)(bytesperline % 256); + hdr[HDR_BYTESPERLINE + 1] = (unsigned char)(bytesperline / 256); + hdr[HDR_XMAX] = (unsigned char)((width - 1) % 256); + hdr[HDR_XMAX + 1] = (unsigned char)((width - 1) / 256); + hdr[HDR_YMAX] = (unsigned char)((height - 1) % 256); + hdr[HDR_YMAX + 1] = (unsigned char)((height - 1) / 256); + hdr[HDR_PALETTEINFO] = 1; + + stream.Write(hdr, 128); + + // Encode image data line by line and write it to the stream + + src = image->GetData(); + + for (; height; height--) + { + switch (format) + { + case wxPCX_8BIT: + { + unsigned char r, g, b; + + for (i = 0; i < width; i++) + { + r = *(src++); + g = *(src++); + b = *(src++); + key = (r << 16) | (g << 8) | b; + + p[i] = (unsigned char)histogram[key].index; + } + break; + } + case wxPCX_24BIT: + { + for (i = 0; i < width; i++) + { + p[i] = *(src++); + p[i + bytesperline] = *(src++); + p[i + 2 * bytesperline] = *(src++); + } + break; + } + } + + RLEencode(p, bytesperline * nplanes, stream); + } + + free(p); + + // For 8 bit images, build the palette and write it to the stream: + if (format == wxPCX_8BIT) + { + // zero unused colours + memset(pal, 0, sizeof(pal)); + + unsigned long index; + + for (wxImageHistogram::iterator entry = histogram.begin(); + entry != histogram.end(); ++entry ) + { + key = entry->first; + index = entry->second.index; + pal[3 * index] = (unsigned char)(key >> 16); + pal[3 * index + 1] = (unsigned char)(key >> 8); + pal[3 * index + 2] = (unsigned char)(key); + } + + stream.PutC(12); + stream.Write(pal, 768); + } + + return wxPCX_OK; +} + +//----------------------------------------------------------------------------- +// wxPCXHandler +//----------------------------------------------------------------------------- + +bool wxPCXHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) ) +{ + int error; + + if (!CanRead(stream)) + { + if (verbose) + { + wxLogError(_("PCX: this is not a PCX file.")); + } + + return false; + } + image->Destroy(); - if (verbose) - wxLogDebug(_T("wxPCXHandler::LoadFile still not implemented")); + if ((error = ReadPCX(image, stream)) != wxPCX_OK) + { + if (verbose) + { + switch (error) + { + case wxPCX_INVFORMAT: wxLogError(_("PCX: image format unsupported")); break; + case wxPCX_MEMERR: wxLogError(_("PCX: couldn't allocate memory")); break; + case wxPCX_VERERR: wxLogError(_("PCX: version number too low")); break; + default: wxLogError(_("PCX: unknown error !!!")); + } + } + image->Destroy(); + return false; + } - return FALSE; + return true; } bool wxPCXHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose ) { - if (verbose) - wxLogDebug(_T("wxPCXHandler::SaveFile still not implemented")); + int error; + + if ((error = SavePCX(image, stream)) != wxPCX_OK) + { + if (verbose) + { + switch (error) + { + case wxPCX_INVFORMAT: wxLogError(_("PCX: invalid image")); break; + case wxPCX_MEMERR: wxLogError(_("PCX: couldn't allocate memory")); break; + default: wxLogError(_("PCX: unknown error !!!")); + } + } + } - return FALSE; + return (error == wxPCX_OK); } -bool wxPCXHandler::CanRead( wxInputStream& stream ) +bool wxPCXHandler::DoCanRead( wxInputStream& stream ) { - return FALSE; -} + unsigned char c = stream.GetC(); // it's ok to modify the stream position here + if ( !stream ) + return false; + // not very safe, but this is all we can get from PCX header :-( + return c == 10; +} #endif // wxUSE_STREAMS - +#endif // wxUSE_IMAGE && wxUSE_PCX