X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e4b8154a65be71ca58edf394546b19b0d3516438..dbe0872fc80f7fc9ac37235ab1f8ba8224b0bfa5:/src/common/imagpcx.cpp diff --git a/src/common/imagpcx.cpp b/src/common/imagpcx.cpp index e203698796..09a4612cbf 100644 --- a/src/common/imagpcx.cpp +++ b/src/common/imagpcx.cpp @@ -1,81 +1,131 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: imagpcx.cpp +// Name: src/common/imagpcx.cpp // Purpose: wxImage PCX handler // Author: Guillermo Rodriguez Garcia -// Version: 1.00 +// 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/defs.h" + #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 -#if wxUSE_STREAMS && wxUSE_PCX - -#include "wx/image.h" +#include "wx/imagpcx.h" #include "wx/wfstream.h" -#include "wx/module.h" -#include "wx/log.h" -#include "wx/intl.h" //----------------------------------------------------------------------------- -// PCX decoding +// wxPCXHandler +//----------------------------------------------------------------------------- + +IMPLEMENT_DYNAMIC_CLASS(wxPCXHandler,wxImageHandler) + +#if wxUSE_STREAMS + +//----------------------------------------------------------------------------- +// RLE encoding and decoding //----------------------------------------------------------------------------- -void RLEencode(unsigned char *WXUNUSED(p), unsigned int WXUNUSED(size), wxOutputStream& WXUNUSED(s)) +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) { - unsigned int i, data, cont; - // 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) + + while (size != 0) { - data = (unsigned char)s.GetC(); + 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++) = data; + *(p++) = (unsigned char)data; size--; } else { - cont = data & 0x3F; + unsigned int cont = data & 0x3F; + if (cont > size) // can happen only if the file is malformed + break; data = (unsigned char)s.GetC(); - for (i = 1; i <= cont; i++) - *(p++) = data; + for (unsigned int i = 1; i <= cont; i++) + *(p++) = (unsigned char)data; size -= cont; } } } -/* PCX header */ +//----------------------------------------------------------------------------- +// PCX reading and saving +//----------------------------------------------------------------------------- + +// PCX header +#define HDR_MANUFACTURER 0 #define HDR_VERSION 1 #define HDR_ENCODING 2 #define HDR_BITSPERPIXEL 3 @@ -85,6 +135,7 @@ void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) #define HDR_YMAX 10 #define HDR_NPLANES 65 #define HDR_BYTESPERLINE 66 +#define HDR_PALETTEINFO 68 // image formats enum { @@ -100,6 +151,7 @@ enum { 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 @@ -117,18 +169,17 @@ int ReadPCX(wxImage *image, wxInputStream& stream) int nplanes; // number of planes int encoding; // is the image RLE encoded? int format; // image format (8 bit, 24 bit) - unsigned int i; - off_t pos; + 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]; @@ -140,7 +191,7 @@ int ReadPCX(wxImage *image, wxInputStream& stream) // 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)) @@ -148,24 +199,19 @@ int ReadPCX(wxImage *image, wxInputStream& stream) else return wxPCX_INVFORMAT; - // If the image is of type wxPCX_8BIT, then there is a - // palette at the end of the file. Read it now before - // proceeding. - // - if (format == wxPCX_8BIT) - { - pos = stream.TellI(); - stream.SeekI(-769, wxFromEnd); + // 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. - if (stream.GetC() != 12) - return wxPCX_INVFORMAT; + // Resize the image and allocate memory for a scanline. - stream.Read(pal, 768); - stream.SeekI(pos, wxFromStart); - } - - // Allocate memory for a scanline and resize the image. - // image->Create(width, height); if (!image->Ok()) @@ -176,10 +222,10 @@ int ReadPCX(wxImage *image, wxInputStream& stream) // Now start reading the file, line by line, and store // the data in the format required by wxImage. - // + dst = image->GetData(); - for (; height; height--) + for (j = height; j; j--) { if (encoding) RLEdecode(p, bytesperline * nplanes, stream); @@ -192,9 +238,9 @@ int ReadPCX(wxImage *image, wxInputStream& stream) { for (i = 0; i < width; i++) { - *(dst++) = pal[ 3 * (p[i]) ]; - *(dst++) = pal[ 3 * (p[i]) + 1]; - *(dst++) = pal[ 3 * (p[i]) + 2]; + // first pass, just store the colour index + *dst = p[i]; + dst += 3; } break; } @@ -213,18 +259,179 @@ int ReadPCX(wxImage *image, wxInputStream& stream) 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->Ok()) + 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 //----------------------------------------------------------------------------- -#if !USE_SHARED_LIBRARIES -IMPLEMENT_DYNAMIC_CLASS(wxPCXHandler,wxImageHandler) -#endif - bool wxPCXHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) ) { int error; @@ -232,9 +439,11 @@ bool wxPCXHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose if (!CanRead(stream)) { if (verbose) + { wxLogError(_("PCX: this is not a PCX file.")); + } - return FALSE; + return false; } image->Destroy(); @@ -245,36 +454,49 @@ bool wxPCXHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose { switch (error) { - case wxPCX_INVFORMAT: wxLogError(_("wxPCXHandler: image format unsupported")); break; - case wxPCX_MEMERR: wxLogError(_("wxPCXHandler: couldn't allocate memory")); break; - case wxPCX_VERERR: wxLogError(_("wxPCXHandler: version number too low")); break; - default: wxLogError(_("wxPCXHandler: unknown 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; + return true; } -bool wxPCXHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool verbose ) +bool wxPCXHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose ) { - wxFAIL_MSG(wxT("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::DoCanRead( wxInputStream& stream ) { - unsigned char c; - - c = stream.GetC(); - stream.SeekI(-1, wxFromCurrent); + 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); + return c == 10; } -#endif // wxUSE_STREAMS && wxUSE_PCX +#endif // wxUSE_STREAMS +#endif // wxUSE_IMAGE && wxUSE_PCX