// 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"
#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"
+#include "wx/hash.h"
+#include "wx/list.h"
+#include "wx/object.h"
+
//-----------------------------------------------------------------------------
-// PCX decoding
+// RLE encoding and decoding
//-----------------------------------------------------------------------------
void RLEencode(unsigned char *p, unsigned int size, wxOutputStream& s)
}
}
-
// Write the last one and return;
//
if ((cont > 1) || ((last & 0xC0) == 0xC0))
}
-/* PCX header */
+//-----------------------------------------------------------------------------
+// PCX reading and saving
+//-----------------------------------------------------------------------------
+
+// PCX header
#define HDR_MANUFACTURER 0
#define HDR_VERSION 1
#define HDR_ENCODING 2
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
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).
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);
- }
- // Allocate memory for a scanline and resize the image.
+ // Resize the image and allocate memory for a scanline.
//
image->Create(width, height);
//
dst = image->GetData();
- for (; height; height--)
+ for (j = height; j; j--)
{
if (encoding)
RLEdecode(p, bytesperline * nplanes, 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;
}
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];
+ }
+ }
+
return wxPCX_OK;
}
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)
int nplanes = 3; // number of planes
int format = wxPCX_24BIT; // image format (8 bit, 24 bit)
+ wxHashTable h(wxKEY_INTEGER); // image histogram
+ unsigned long key; // key in the hashtable
unsigned int i;
- /* XXX
- build_palette();
- if (num_of_colors <= 256)
+ // See if we can save as 8 bit.
+ //
+ if (image->CountColours(256) <= 256)
{
+ image->ComputeHistogram(h);
format = wxPCX_8BIT;
nplanes = 1;
}
- else
- free_palette();
- */
// Get image dimensions, calculate bytesperline (must be even,
// according to PCX specs) and allocate space for one complete
width = image->GetWidth();
height = image->GetHeight();
- nplanes = 3; /* 1 for wxPCX_8BIT */
bytesperline = width;
if (bytesperline % 2)
bytesperline++;
switch (format)
{
case wxPCX_8BIT:
- /* XXX
{
+ unsigned char r, g, b;
+ wxHNode *hnode;
+
for (i = 0; i < width; i++)
{
- hash = *(src++) << 24 +
- *(src++) << 16 +
- *(src++) << 8;
+ r = *(src++);
+ g = *(src++);
+ b = *(src++);
+ key = (r << 16) | (g << 8) | b;
- p[i] = palette_lookup(hash);
+ hnode = (wxHNode *) h.Get(key);
+ p[i] = hnode->index;
}
break;
}
- */
case wxPCX_24BIT:
{
for (i = 0; i < width; i++)
break;
}
}
-
+
RLEencode(p, bytesperline * nplanes, stream);
}
free(p);
- /* XXX
+ // 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)
+ {
+ 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;
+ }
+
stream.PutC(12);
- dump_palette();
+ 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) )
{
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