[wxWidgets.git] / src / common / imagbmp.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        imagbmp.cpp
// Purpose:     wxImage BMP handler
// Author:      Robert Roebling
// RCS-ID:      $Id$
// Copyright:   (c) Robert Roebling
// 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
#endif

#include "wx/image.h"
#include "wx/bitmap.h"
#include "wx/debug.h"
#include "wx/log.h"
#include "wx/app.h"
#include "wx/filefn.h"
#include "wx/wfstream.h"
#include "wx/intl.h"
#include "wx/module.h"

// For memcpy
#include <string.h>

#ifdef __SALFORDC__
#ifdef FAR
#undef FAR
#endif
#endif

#ifdef __WXMSW__
#include <windows.h>
#endif

//-----------------------------------------------------------------------------
// wxBMPHandler
//-----------------------------------------------------------------------------

#if !USE_SHARED_LIBRARIES
IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
#endif

#if wxUSE_STREAMS

#ifndef BI_RGB
#define BI_RGB       0
#define BI_RLE8      1
#define BI_RLE4      2
#endif

#ifndef BI_BITFIELDS
#define BI_BITFIELDS 3
#endif

#define poffset (line * width * 3 + column * 3)

bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
    int             rshift = 0, gshift = 0, bshift = 0;
    wxUint8         aByte;
    wxUint16        aWord;
    wxInt32         dbuf[4], aDword,
                    rmask = 0, gmask = 0, bmask = 0;
    wxInt8          bbuf[4];
    struct _cmap {
        unsigned char r, g, b;
    } *cmap = NULL;

    off_t start_offset = stream.TellI();

    image->Destroy();

    /*
     * Read the BMP header
     */

    stream.Read( &bbuf, 2 );
    stream.Read( dbuf, 4 * 4 );

#if 0 // unused
    wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] );
#endif
    wxInt32 offset = wxINT32_SWAP_ON_BE( dbuf[2] );

    stream.Read(dbuf, 4 * 2);
    int width = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
    int height = (int)wxINT32_SWAP_ON_BE( dbuf[1] );
    if (width > 32767)
    {
        if (verbose)
            wxLogError( _("BMP: Image width > 32767 pixels for file.") );
        return FALSE;
    }
    if (height > 32767)
    {
        if (verbose)
            wxLogError( _("BMP: Image height > 32767 pixels for file.") );
        return FALSE;
    }

    stream.Read( &aWord, 2 );
/*
    TODO
    int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
*/
    stream.Read( &aWord, 2 );
    int bpp = (int)wxUINT16_SWAP_ON_BE( aWord );
    if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32)
    {
        if (verbose)
            wxLogError( _("BMP: Unknown bitdepth in file.") );
        return FALSE;
    }

    stream.Read( dbuf, 4 * 4 );
    int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
    if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
    {
        if (verbose)
            wxLogError( _("BMP: Unknown encoding in file.") );
        return FALSE;
    }

    stream.Read( dbuf, 4 * 2 );
    int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
    if (ncolors == 0)
        ncolors = 1 << bpp;
    /* some more sanity checks */
    if (((comp == BI_RLE4) && (bpp != 4)) ||
        ((comp == BI_RLE8) && (bpp != 8)) ||
        ((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
    {
        if (verbose)
            wxLogError( _("BMP: Encoding doesn't match bitdepth.") );
        return FALSE;
    }
    if (bpp < 16)
    {
        cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors);
        if (!cmap)
        {
            if (verbose)
                wxLogError( _("BMP: Couldn't allocate memory.") );
            return FALSE;
        }
    }
    else
        cmap = NULL;

    image->Create( width, height );
    unsigned char *ptr = image->GetData();
    if (!ptr)
    {
        if (verbose)
            wxLogError( _("BMP: Couldn't allocate memory.") );
        if (cmap)
            free(cmap);
        return FALSE;
    }

    /*
     * Reading the palette, if it exists.
     */
    if (bpp < 16 && ncolors != 0)
    {
        for (int j = 0; j < ncolors; j++)
        {
            stream.Read( bbuf, 4 );
            cmap[j].b = bbuf[0];
            cmap[j].g = bbuf[1];
            cmap[j].r = bbuf[2];
        }
    }
    else if (bpp == 16 || bpp == 32)
    {
        if (comp == BI_BITFIELDS)
        {
            int bit = 0;
            stream.Read( dbuf, 4 * 3 );
            bmask = wxINT32_SWAP_ON_BE( dbuf[0] );
            gmask = wxINT32_SWAP_ON_BE( dbuf[1] );
            rmask = wxINT32_SWAP_ON_BE( dbuf[2] );
            /* find shift amount.. ugly, but i can't think of a better way */
            for (bit = 0; bit < bpp; bit++)
            {
                if (bmask & (1 << bit))
                    bshift = bit;
                if (gmask & (1 << bit))
                    gshift = bit;
                if (rmask & (1 << bit))
                    rshift = bit;
            }
        }
        else if (bpp == 16)
        {
            rmask = 0x7C00;
            gmask = 0x03E0;
            bmask = 0x001F;
            rshift = 10;
            gshift = 5;
            bshift = 0;
        }
        else if (bpp == 32)
        {
            rmask = 0x00FF0000;
            gmask = 0x0000FF00;
            bmask = 0x000000FF;
            rshift = 16;
            gshift = 8;
            bshift = 0;
        }
    }

    /*
     * Reading the image data
     */
    stream.SeekI( start_offset + offset );
    unsigned char *data = ptr;

    /* set the whole image to the background color */
    if (bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8))
    {
        for (int i = 0; i < width * height; i++)
        {
            *ptr++ = cmap[0].r;
            *ptr++ = cmap[0].g;
            *ptr++ = cmap[0].b;
        }
        ptr = data;
    }

    int line = 0;
    int column = 0;
    int linesize = ((width * bpp + 31) / 32) * 4;

    /* BMPs are stored upside down */
    for (line = (height - 1); line >= 0; line--)
    {
        int linepos = 0;
        for (column = 0; column < width;)
        {
            if (bpp < 16)
            {
                int index = 0;
                linepos++;
                aByte = stream.GetC();
                if (bpp == 1)
                {
                    int bit = 0;
                    for (bit = 0; bit < 8; bit++)
                    {
                        index = ((aByte & (0x80 >> bit)) ? 1 : 0);
                        ptr[poffset] = cmap[index].r;
                        ptr[poffset + 1] = cmap[index].g;
                        ptr[poffset + 2] = cmap[index].b;
                        column++;
                    }
                }
                else if (bpp == 4)
                {
                    if (comp == BI_RLE4)
                    {
                        if (verbose)
                            wxLogError( _("BMP: Cannot deal with 4bit encoded yet.") );
                        image->Destroy();
                        free(cmap);
                        return FALSE;
                    }
                    else
                    {
                        int nibble = 0;
                        for (nibble = 0; nibble < 2; nibble++)
                        {
                            index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
                            if (index >= 16)
                                index = 15;
                            ptr[poffset] = cmap[index].r;
                            ptr[poffset + 1] = cmap[index].g;
                            ptr[poffset + 2] = cmap[index].b;
                            column++;
                        }
                    }
                }
                else if (bpp == 8)
                {
                    if (comp == BI_RLE8)
                    {
                        unsigned char first;
                        first = aByte;
                        aByte = stream.GetC();
                        if (first == 0)
                        {
                            if (aByte == 0)
                            {
                                /* column = width; */
                            }
                            else if (aByte == 1)
                            {
                                column = width;
                                line = -1;
                            }
                            else if (aByte == 2)
                            {
                                aByte = stream.GetC();
                                column += aByte;
                                linepos = column * bpp / 8;
                                aByte = stream.GetC();
                                line += aByte;
                            }
                            else
                            {
                                int absolute = aByte;
                                for (int k = 0; k < absolute; k++)
                                {
                                    linepos++;
                                    aByte = stream.GetC();
                                    ptr[poffset    ] = cmap[aByte].r;
                                    ptr[poffset + 1] = cmap[aByte].g;
                                    ptr[poffset + 2] = cmap[aByte].b;
                                    column++;
                                }
                                if (absolute & 0x01)
                                    aByte = stream.GetC();
                            }
                        }
                        else
                        {
                            for (int l = 0; l < first; l++)
                            {
                                ptr[poffset    ] = cmap[aByte].r;
                                ptr[poffset + 1] = cmap[aByte].g;
                                ptr[poffset + 2] = cmap[aByte].b;
                                column++;
                                linepos++;
                            }
                        }
                    }
                    else
                    {
                        ptr[poffset    ] = cmap[aByte].r;
                        ptr[poffset + 1] = cmap[aByte].g;
                        ptr[poffset + 2] = cmap[aByte].b;
                        column++;
                        // linepos += size;    seems to be wrong, RR
                    }
                }
               }
               else if (bpp == 24)
               {
                   stream.Read( &bbuf, 3 );
                   linepos += 3;
                   ptr[poffset    ] = (unsigned char)bbuf[2];
                   ptr[poffset + 1] = (unsigned char)bbuf[1];
                   ptr[poffset + 2] = (unsigned char)bbuf[0];
                   column++;
               }
               else if (bpp == 16)
               {
                   unsigned char temp;
                   stream.Read( &aWord, 2 );
                   aWord = wxUINT16_SWAP_ON_BE( aWord );
                   linepos += 2;
                   temp = (aWord & rmask) >> rshift;
                   ptr[poffset] = temp;
                   temp = (aWord & gmask) >> gshift;
                   ptr[poffset + 1] = temp;
                   temp = (aWord & bmask) >> bshift;
                   ptr[poffset + 2] = temp;
                   column++;
               }
               else
               {
                   unsigned char temp;
                   stream.Read( &aDword, 4 );
                   aDword = wxINT32_SWAP_ON_BE( aDword );
                   linepos += 4;
                   temp = (aDword & rmask) >> rshift;
                   ptr[poffset] = temp;
                   temp = (aDword & gmask) >> gshift;
                   ptr[poffset + 1] = temp;
                   temp = (aDword & bmask) >> bshift;
                   ptr[poffset + 2] = temp;
                   column++;
               }
          }
          while ((linepos < linesize) && (comp != 1) && (comp != 2))
          {
              stream.Read( &aByte, 1 );
              linepos += 1;
              if (stream.LastError() != wxStream_NOERROR)
                  break;
          }
     }
     if (cmap)
       free(cmap);

     image->SetMask( FALSE );

     return TRUE;
}

bool wxBMPHandler::DoCanRead( wxInputStream& stream )
{
    unsigned char hdr[2];

    stream.Read(&hdr, 2);
    stream.SeekI(-2, wxFromCurrent);
    return (hdr[0] == 'B' && hdr[1] == 'M');
}

#endif // wxUSE_STREAMS
Commit	Line	Data
e65ed37a RR	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: imagbmp.cpp
	3	// Purpose: wxImage BMP handler
	4	// Author: Robert Roebling
	5	// RCS-ID: $Id$
	6	// Copyright: (c) Robert Roebling
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	/*
	11	We don't put pragma implement in this file because it is already present in
	12	src/common/image.cpp
	13	*/
	14
	15	// For compilers that support precompilation, includes "wx.h".
	16	#include "wx/wxprec.h"
	17
	18	#ifdef __BORLANDC__
	19	#pragma hdrstop
	20	#endif
	21
	22	#include "wx/image.h"
	23	#include "wx/bitmap.h"
	24	#include "wx/debug.h"
	25	#include "wx/log.h"
	26	#include "wx/app.h"
	27	#include "wx/filefn.h"
	28	#include "wx/wfstream.h"
	29	#include "wx/intl.h"
	30	#include "wx/module.h"
	31
	32	// For memcpy
	33	#include <string.h>
	34
	35	#ifdef __SALFORDC__
	36	#ifdef FAR
	37	#undef FAR
	38	#endif
	39	#endif
	40
	41	#ifdef __WXMSW__
	42	#include <windows.h>
	43	#endif
	44
	45	//-----------------------------------------------------------------------------
	46	// wxBMPHandler
	47	//-----------------------------------------------------------------------------
	48
	49	#if !USE_SHARED_LIBRARIES
	50	IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
	51	#endif
	52
	53	#if wxUSE_STREAMS
	54
	55	#ifndef BI_RGB
	56	#define BI_RGB 0
	57	#define BI_RLE8 1
	58	#define BI_RLE4 2
	59	#endif
	60
	61	#ifndef BI_BITFIELDS
	62	#define BI_BITFIELDS 3
	63	#endif
	64
65	#define poffset (line * width * 3 + column * 3)
66
58c837a4	67	bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
e65ed37a RR	68	{
	69	int rshift = 0, gshift = 0, bshift = 0;
	70	wxUint8 aByte;
	71	wxUint16 aWord;
31528cd3	72	wxInt32 dbuf[4], aDword,
e65ed37a RR	73	rmask = 0, gmask = 0, bmask = 0;
	74	wxInt8 bbuf[4];
	75	struct _cmap {
	76	unsigned char r, g, b;
	77	} *cmap = NULL;
31528cd3	78
e65ed37a RR	79	off_t start_offset = stream.TellI();
	80
	81	image->Destroy();
	82
	83	/*
	84	* Read the BMP header
	85	*/
	86
	87	stream.Read( &bbuf, 2 );
	88	stream.Read( dbuf, 4 * 4 );
	89
31528cd3	90	#if 0 // unused
e65ed37a	91	wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] );
31528cd3	92	#endif
e65ed37a RR	93	wxInt32 offset = wxINT32_SWAP_ON_BE( dbuf[2] );
	94
	95	stream.Read(dbuf, 4 * 2);
	96	int width = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
	97	int height = (int)wxINT32_SWAP_ON_BE( dbuf[1] );
	98	if (width > 32767)
	99	{
58c837a4 RR	100	if (verbose)
58c837a4 RR	101	wxLogError( _("BMP: Image width > 32767 pixels for file.") );
e65ed37a RR	102	return FALSE;
	103	}
	104	if (height > 32767)
	105	{
58c837a4 RR	106	if (verbose)
58c837a4 RR	107	wxLogError( _("BMP: Image height > 32767 pixels for file.") );
e65ed37a RR	108	return FALSE;
e65ed37a RR	109	}
31528cd3	110
e65ed37a RR	111	stream.Read( &aWord, 2 );
	112	/*
	113	TODO
	114	int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
	115	*/
	116	stream.Read( &aWord, 2 );
	117	int bpp = (int)wxUINT16_SWAP_ON_BE( aWord );
	118	if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32)
	119	{
58c837a4 RR	120	if (verbose)
58c837a4 RR	121	wxLogError( _("BMP: Unknown bitdepth in file.") );
e65ed37a RR	122	return FALSE;
e65ed37a RR	123	}
31528cd3	124
e65ed37a RR	125	stream.Read( dbuf, 4 * 4 );
	126	int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
	127	if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
	128	{
58c837a4 RR	129	if (verbose)
58c837a4 RR	130	wxLogError( _("BMP: Unknown encoding in file.") );
e65ed37a RR	131	return FALSE;
e65ed37a RR	132	}
31528cd3	133
e65ed37a RR	134	stream.Read( dbuf, 4 * 2 );
	135	int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
	136	if (ncolors == 0)
	137	ncolors = 1 << bpp;
	138	/* some more sanity checks */
31528cd3 VZ	139	if (((comp == BI_RLE4) && (bpp != 4)) \|\|
	140	((comp == BI_RLE8) && (bpp != 8)) \|\|
	141	((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
e65ed37a	142	{
58c837a4 RR	143	if (verbose)
58c837a4 RR	144	wxLogError( _("BMP: Encoding doesn't match bitdepth.") );
e65ed37a RR	145	return FALSE;
	146	}
	147	if (bpp < 16)
	148	{
	149	cmap = (struct _cmap )malloc(sizeof(struct _cmap) ncolors);
	150	if (!cmap)
	151	{
58c837a4 RR	152	if (verbose)
58c837a4 RR	153	wxLogError( _("BMP: Couldn't allocate memory.") );
e65ed37a RR	154	return FALSE;
	155	}
	156	}
	157	else
	158	cmap = NULL;
	159
	160	image->Create( width, height );
	161	unsigned char *ptr = image->GetData();
	162	if (!ptr)
	163	{
58c837a4 RR	164	if (verbose)
58c837a4 RR	165	wxLogError( _("BMP: Couldn't allocate memory.") );
e65ed37a RR	166	if (cmap)
	167	free(cmap);
	168	return FALSE;
	169	}
	170
	171	/*
	172	* Reading the palette, if it exists.
	173	*/
	174	if (bpp < 16 && ncolors != 0)
	175	{
	176	for (int j = 0; j < ncolors; j++)
	177	{
	178	stream.Read( bbuf, 4 );
	179	cmap[j].b = bbuf[0];
	180	cmap[j].g = bbuf[1];
	181	cmap[j].r = bbuf[2];
	182	}
	183	}
	184	else if (bpp == 16 \|\| bpp == 32)
	185	{
	186	if (comp == BI_BITFIELDS)
	187	{
	188	int bit = 0;
	189	stream.Read( dbuf, 4 * 3 );
	190	bmask = wxINT32_SWAP_ON_BE( dbuf[0] );
	191	gmask = wxINT32_SWAP_ON_BE( dbuf[1] );
	192	rmask = wxINT32_SWAP_ON_BE( dbuf[2] );
	193	/* find shift amount.. ugly, but i can't think of a better way */
	194	for (bit = 0; bit < bpp; bit++)
	195	{
	196	if (bmask & (1 << bit))
	197	bshift = bit;
	198	if (gmask & (1 << bit))
	199	gshift = bit;
	200	if (rmask & (1 << bit))
	201	rshift = bit;
	202	}
	203	}
	204	else if (bpp == 16)
	205	{
	206	rmask = 0x7C00;
	207	gmask = 0x03E0;
	208	bmask = 0x001F;
	209	rshift = 10;
	210	gshift = 5;
	211	bshift = 0;
	212	}
	213	else if (bpp == 32)
	214	{
	215	rmask = 0x00FF0000;
	216	gmask = 0x0000FF00;
	217	bmask = 0x000000FF;
	218	rshift = 16;
	219	gshift = 8;
	220	bshift = 0;
	221	}
	222	}
	223
	224	/*
	225	* Reading the image data
	226	*/
	227	stream.SeekI( start_offset + offset );
	228	unsigned char *data = ptr;
	229
230	/* set the whole image to the background color */
231	if (bpp < 16 && (comp == BI_RLE4 \|\| comp == BI_RLE8))
232	{
233	for (int i = 0; i < width * height; i++)
234	{
235	*ptr++ = cmap[0].r;
236	*ptr++ = cmap[0].g;
237	*ptr++ = cmap[0].b;
238	}
239	ptr = data;
240	}
31528cd3	241
e65ed37a RR	242	int line = 0;
	243	int column = 0;
	244	int linesize = ((width * bpp + 31) / 32) * 4;
	245
	246	/* BMPs are stored upside down */
31528cd3	247	for (line = (height - 1); line >= 0; line--)
e65ed37a RR	248	{
	249	int linepos = 0;
	250	for (column = 0; column < width;)
	251	{
	252	if (bpp < 16)
	253	{
	254	int index = 0;
	255	linepos++;
	256	aByte = stream.GetC();
	257	if (bpp == 1)
	258	{
	259	int bit = 0;
	260	for (bit = 0; bit < 8; bit++)
	261	{
	262	index = ((aByte & (0x80 >> bit)) ? 1 : 0);
	263	ptr[poffset] = cmap[index].r;
	264	ptr[poffset + 1] = cmap[index].g;
	265	ptr[poffset + 2] = cmap[index].b;
	266	column++;
	267	}
	268	}
	269	else if (bpp == 4)
	270	{
	271	if (comp == BI_RLE4)
	272	{
58c837a4 RR	273	if (verbose)
58c837a4 RR	274	wxLogError( _("BMP: Cannot deal with 4bit encoded yet.") );
e65ed37a RR	275	image->Destroy();
	276	free(cmap);
	277	return FALSE;
	278	}
	279	else
	280	{
	281	int nibble = 0;
	282	for (nibble = 0; nibble < 2; nibble++)
	283	{
	284	index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
	285	if (index >= 16)
	286	index = 15;
	287	ptr[poffset] = cmap[index].r;
	288	ptr[poffset + 1] = cmap[index].g;
	289	ptr[poffset + 2] = cmap[index].b;
	290	column++;
	291	}
	292	}
	293	}
	294	else if (bpp == 8)
	295	{
	296	if (comp == BI_RLE8)
	297	{
	298	unsigned char first;
	299	first = aByte;
	300	aByte = stream.GetC();
	301	if (first == 0)
	302	{
	303	if (aByte == 0)
	304	{
	305	/* column = width; */
	306	}
	307	else if (aByte == 1)
	308	{
	309	column = width;
	310	line = -1;
	311	}
	312	else if (aByte == 2)
	313	{
	314	aByte = stream.GetC();
	315	column += aByte;
	316	linepos = column * bpp / 8;
	317	aByte = stream.GetC();
	318	line += aByte;
	319	}
	320	else
	321	{
	322	int absolute = aByte;
	323	for (int k = 0; k < absolute; k++)
	324	{
	325	linepos++;
	326	aByte = stream.GetC();
	327	ptr[poffset ] = cmap[aByte].r;
	328	ptr[poffset + 1] = cmap[aByte].g;
	329	ptr[poffset + 2] = cmap[aByte].b;
	330	column++;
	331	}
	332	if (absolute & 0x01)
	333	aByte = stream.GetC();
	334	}
	335	}
	336	else
	337	{
	338	for (int l = 0; l < first; l++)
339	{
340	ptr[poffset ] = cmap[aByte].r;
341	ptr[poffset + 1] = cmap[aByte].g;
342	ptr[poffset + 2] = cmap[aByte].b;
343	column++;
344	linepos++;
345	}
346	}
347	}
348	else
349	{
350	ptr[poffset ] = cmap[aByte].r;
351	ptr[poffset + 1] = cmap[aByte].g;
352	ptr[poffset + 2] = cmap[aByte].b;
353	column++;
953704c1	354	// linepos += size; seems to be wrong, RR
e65ed37a RR	355	}
	356	}
	357	}
	358	else if (bpp == 24)
	359	{
	360	stream.Read( &bbuf, 3 );
	361	linepos += 3;
	362	ptr[poffset ] = (unsigned char)bbuf[2];
	363	ptr[poffset + 1] = (unsigned char)bbuf[1];
	364	ptr[poffset + 2] = (unsigned char)bbuf[0];
	365	column++;
	366	}
	367	else if (bpp == 16)
	368	{
	369	unsigned char temp;
	370	stream.Read( &aWord, 2 );
31528cd3	371	aWord = wxUINT16_SWAP_ON_BE( aWord );
e65ed37a RR	372	linepos += 2;
	373	temp = (aWord & rmask) >> rshift;
	374	ptr[poffset] = temp;
	375	temp = (aWord & gmask) >> gshift;
	376	ptr[poffset + 1] = temp;
e115e771	377	temp = (aWord & bmask) >> bshift;
e65ed37a RR	378	ptr[poffset + 2] = temp;
	379	column++;
	380	}
	381	else
	382	{
	383	unsigned char temp;
	384	stream.Read( &aDword, 4 );
31528cd3	385	aDword = wxINT32_SWAP_ON_BE( aDword );
e65ed37a RR	386	linepos += 4;
	387	temp = (aDword & rmask) >> rshift;
	388	ptr[poffset] = temp;
	389	temp = (aDword & gmask) >> gshift;
	390	ptr[poffset + 1] = temp;
	391	temp = (aDword & bmask) >> bshift;
	392	ptr[poffset + 2] = temp;
	393	column++;
	394	}
	395	}
	396	while ((linepos < linesize) && (comp != 1) && (comp != 2))
	397	{
	398	stream.Read( &aByte, 1 );
	399	linepos += 1;
	400	if (stream.LastError() != wxStream_NOERROR)
	401	break;
	402	}
	403	}
31528cd3	404	if (cmap)
e65ed37a RR	405	free(cmap);
	406
	407	image->SetMask( FALSE );
	408
	409	return TRUE;
	410	}
	411
995612e2	412	bool wxBMPHandler::DoCanRead( wxInputStream& stream )
0828c087 VS	413	{
0828c087 VS	414	unsigned char hdr[2];
995612e2	415
0828c087 VS	416	stream.Read(&hdr, 2);
	417	stream.SeekI(-2, wxFromCurrent);
	418	return (hdr[0] == 'B' && hdr[1] == 'M');
	419	}
	420
e65ed37a RR	421	#endif // wxUSE_STREAMS
	422
	423