// Name: imagpcx.cpp
// Purpose: wxImage PCX handler
// Author: Guillermo Rodriguez Garcia <guille@iies.es>
-// Version: 1.00
+// Version: 1.1
// CVS-ID: $Id$
// Copyright: (c) 1999 Guillermo Rodriguez Garcia
// Licence: wxWindows licence
{
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))
{
}
else
{
- // Need to write a 'counter' byte?
- //
+ // need to write a 'counter' byte?
if ((cont > 1) || ((last & 0xC0) == 0xC0))
s.PutC((char) (cont | 0xC0));
}
}
- // Write the last one and return;
- //
+ // write the last one and return;
if ((cont > 1) || ((last & 0xC0) == 0xC0))
s.PutC((char) (cont | 0xC0));
// 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();
// 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;
// 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];
// 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))
// and another to replace 'colour indexes' with RGB
// values.
-
// Resize the image and allocate memory for a scanline.
- //
+
image->Create(width, height);
if (!image->Ok())
// 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--)
// 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;
*(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)
{
wxHashTable h(wxKEY_INTEGER); // 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);
// 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;
// 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;
stream.Write(hdr, 128);
// Encode image data line by line and write it to the stream
- //
+
src = image->GetData();
for (; height; height--)
key = (r << 16) | (g << 8) | b;
hnode = (wxHNode *) h.Get(key);
- p[i] = hnode->index;
+ p[i] = (unsigned char)hnode->index;
}
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;
{
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();
{
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 !!!"));
}
}
}
projects / wxWidgets.git / blobdiff