X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d32548aa77d20293dd1a7cf7df7eb56b95a00166..109c7768eb46ccbb45adc1c409fe8f6b7d799e2f:/src/common/imagpcx.cpp diff --git a/src/common/imagpcx.cpp b/src/common/imagpcx.cpp index c8420edf10..64a4d246b0 100644 --- a/src/common/imagpcx.cpp +++ b/src/common/imagpcx.cpp @@ -2,7 +2,7 @@ // 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 @@ -23,7 +23,7 @@ # include "wx/defs.h" #endif -#if wxUSE_STREAMS && wxUSE_PCX +#if wxUSE_IMAGE && wxUSE_STREAMS && wxUSE_PCX #include "wx/imagpcx.h" #include "wx/wfstream.h" @@ -56,8 +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)) { @@ -65,8 +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)); @@ -76,8 +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)); @@ -93,7 +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(); @@ -101,10 +99,10 @@ 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; + *(p++) = (unsigned char)data; size--; } else @@ -112,7 +110,7 @@ void RLEdecode(unsigned char *p, unsigned int size, wxInputStream& s) cont = data & 0x3F; data = (unsigned char)s.GetC(); for (i = 1; i <= cont; i++) - *(p++) = data; + *(p++) = (unsigned char)data; size -= cont; } } @@ -168,18 +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]; @@ -191,7 +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)) @@ -199,24 +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; + // 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()) @@ -227,10 +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); @@ -243,9 +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; } @@ -264,14 +256,50 @@ 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). 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) { @@ -283,15 +311,15 @@ int SavePCX(wxImage *image, wxOutputStream& stream) unsigned int bytesperline; // bytes per line (each plane) int nplanes = 3; // number of planes int format = wxPCX_24BIT; // image format (8 bit, 24 bit) - wxHashTable h(wxKEY_INTEGER); // image histogram + 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(h); + image->ComputeHistogram(histogram); format = wxPCX_8BIT; nplanes = 1; } @@ -299,7 +327,7 @@ int SavePCX(wxImage *image, wxOutputStream& stream) // 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; @@ -314,7 +342,7 @@ 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; @@ -322,18 +350,18 @@ int SavePCX(wxImage *image, wxOutputStream& stream) hdr[HDR_ENCODING] = 1; hdr[HDR_NPLANES] = nplanes; hdr[HDR_BITSPERPIXEL] = 8; - hdr[HDR_BYTESPERLINE] = bytesperline % 256; - hdr[HDR_BYTESPERLINE + 1] = bytesperline / 256; - hdr[HDR_XMAX] = (width - 1) % 256; - hdr[HDR_XMAX + 1] = (width - 1) / 256; - hdr[HDR_YMAX] = (height - 1) % 256; - hdr[HDR_YMAX + 1] = (height - 1) / 256; + 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--) @@ -343,7 +371,6 @@ int SavePCX(wxImage *image, wxOutputStream& stream) case wxPCX_8BIT: { unsigned char r, g, b; - wxHNode *hnode; for (i = 0; i < width; i++) { @@ -352,8 +379,7 @@ int SavePCX(wxImage *image, wxOutputStream& stream) b = *(src++); key = (r << 16) | (g << 8) | b; - hnode = (wxHNode *) h.Get(key); - p[i] = hnode->index; + p[i] = (unsigned char)histogram[key].index; } break; } @@ -371,29 +397,25 @@ int SavePCX(wxImage *image, wxOutputStream& stream) RLEencode(p, bytesperline * nplanes, stream); } - + free(p); - // For 8 bit images, build the palette and write it to the stream - // + // For 8 bit images, build the palette and write it to the stream: if (format == wxPCX_8BIT) { - wxNode *node; - wxHNode *hnode; - // zero unused colours memset(pal, 0, sizeof(pal)); - h.BeginFind(); - while ((node = h.Next()) != NULL) + unsigned long index; + + for (wxImageHistogram::iterator entry = histogram.begin(); + entry != histogram.end(); entry++ ) { - key = node->GetKeyInteger(); - hnode = (wxHNode *) node->GetData(); - - pal[3 * hnode->index] = (unsigned char)(key >> 16); - pal[3 * hnode->index + 1] = (unsigned char)(key >> 8); - pal[3 * hnode->index + 2] = (unsigned char)(key); - delete hnode; + 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); @@ -429,10 +451,10 @@ 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(); @@ -452,9 +474,9 @@ 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 !!!")); } } } @@ -464,13 +486,12 @@ bool wxPCXHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos bool wxPCXHandler::DoCanRead( wxInputStream& stream ) { - unsigned char c; - - c = stream.GetC(); - stream.SeekI(-1, wxFromCurrent); + unsigned char c = stream.GetC(); + 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