X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/faa7a70eaf23743f54e1fd3f1b28e24663bdcc78..ec37df5776f89de888cdef2ac1445896d283590a:/src/common/imagpcx.cpp?ds=sidebyside diff --git a/src/common/imagpcx.cpp b/src/common/imagpcx.cpp index 0c631d4d8c..348dd9f8f9 100644 --- a/src/common/imagpcx.cpp +++ b/src/common/imagpcx.cpp @@ -2,16 +2,15 @@ // Name: 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 -*/ +#ifdef __GNUG__ +#pragma implementation "imagpcx.h" +#endif // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -26,7 +25,7 @@ #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" @@ -37,7 +36,7 @@ #include "wx/object.h" //----------------------------------------------------------------------------- -// PCX decoding +// RLE encoding and decoding //----------------------------------------------------------------------------- void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s) @@ -57,8 +56,8 @@ void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s) { data = (unsigned char) *(p++); - // Up to 63 bytes with the same value can be stored using a - // single { cont, value } pair. + // Up to 63 bytes with the same value can be stored using + // a single { cont, value } pair. // if ((data == last) && (cont < 63)) { @@ -66,8 +65,7 @@ void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s) } else { - // Need to write a 'counter' byte? - // + // need to write a 'counter' byte? if ((cont > 1) || ((last & 0xC0) == 0xC0)) s.PutC((char) (cont | 0xC0)); @@ -77,9 +75,7 @@ void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s) } } - - // Write the last one and return; - // + // write the last one and return; if ((cont > 1) || ((last & 0xC0) == 0xC0)) s.PutC((char) (cont | 0xC0)); @@ -95,7 +91,7 @@ void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) // 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) { data = (unsigned char)s.GetC(); @@ -103,7 +99,7 @@ void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) // 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; @@ -121,7 +117,11 @@ void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) } -/* PCX header */ +//----------------------------------------------------------------------------- +// PCX reading and saving +//----------------------------------------------------------------------------- + +// PCX header #define HDR_MANUFACTURER 0 #define HDR_VERSION 1 #define HDR_ENCODING 2 @@ -166,18 +166,17 @@ 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]; @@ -189,7 +188,7 @@ 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)) @@ -197,24 +196,19 @@ 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; - - stream.Read(pal, 768); - stream.SeekI(pos, wxFromStart); - } + // Resize the image and allocate memory for a scanline. - // Allocate memory for a scanline and resize the image. - // image->Create(width, height); if (!image->Ok()) @@ -225,10 +219,10 @@ 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); @@ -241,9 +235,9 @@ 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; } @@ -262,14 +256,49 @@ 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]; + } + + unsigned char* r = new unsigned char[256]; + unsigned char* g = new unsigned char[256]; + unsigned char* b = new unsigned char[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)); + delete[] r; delete[] g; delete[] b; + } + 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). Currently, always saves images -// in 24 bit format. XXX +// (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) { @@ -279,34 +308,25 @@ int SavePCX(wxImage *image, wxOutputStream& stream) unsigned char *src; // pointer into wxImage data unsigned int width, height; // size of the image unsigned int bytesperline; // bytes per line (each plane) - int nplanes; // number of planes - int format; // image format (8 bit, 24 bit) + int nplanes = 3; // number of planes + int format = wxPCX_24BIT; // image format (8 bit, 24 bit) wxHashTable h(wxKEY_INTEGER); // image histogram - unsigned long ncolours; // num. of different colours unsigned long key; // key in the hashtable unsigned int i; - - // Get the histogram of the image, and decide whether to save - // as 8 bit or 24 bit, according to the number of colours. - // - ncolours = image->CountColours(257); - if (ncolours <= 256) + // See if we can save as 8 bit. + + if (image->CountColours(256) <= 256) { image->ComputeHistogram(h); format = wxPCX_8BIT; nplanes = 1; } - else - { - format = wxPCX_24BIT; - nplanes = 3; - } // 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; @@ -321,7 +341,7 @@ int SavePCX(wxImage *image, wxOutputStream& stream) // 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; @@ -340,7 +360,7 @@ int SavePCX(wxImage *image, wxOutputStream& stream) stream.Write(hdr, 128); // Encode image data line by line and write it to the stream - // + src = image->GetData(); for (; height; height--) @@ -360,7 +380,7 @@ int SavePCX(wxImage *image, wxOutputStream& stream) key = (r << 16) | (g << 8) | b; hnode = (wxHNode *) h.Get(key); - p[i] = hnode->index; + p[i] = (unsigned char)hnode->index; } break; } @@ -375,14 +395,14 @@ int SavePCX(wxImage *image, wxOutputStream& stream) 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) { wxNode *node; @@ -436,10 +456,10 @@ 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(); @@ -459,9 +479,9 @@ bool wxPCXHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos { switch (error) { - case wxPCX_INVFORMAT: wxLogError(_("wxPCXHandler: invalid image")); break; - case wxPCX_MEMERR: wxLogError(_("wxPCXHandler: couldn't allocate memory")); break; - default: wxLogError(_("wxPCXHandler: unknown error !!!")); + case wxPCX_INVFORMAT: wxLogError(_("PCX: invalid image")); break; + case wxPCX_MEMERR: wxLogError(_("PCX: couldn't allocate memory")); break; + default: wxLogError(_("PCX: unknown error !!!")); } } }