[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 WXUNUSED(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)
    {
        wxLogError( wxT("Image width > 32767 pixels for file.") );
        return FALSE;
    }
    if (height > 32767)
    {
        wxLogError( wxT("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)
    {
        wxLogError( wxT("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)
    {
        wxLogError( wxT("unknown encoding in Windows BMP 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)))
    {
        wxLogError( wxT("encoding of BMP doesn't match bitdepth.") );
        return FALSE;
    }
    if (bpp < 16)
    {
        cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors);
        if (!cmap)
        {
            wxLogError( wxT("Cannot allocate RAM for color map in BMP file.") );
            return FALSE;
        }
    }
    else
        cmap = NULL;

    image->Create( width, height );
    unsigned char *ptr = image->GetData();
    if (!ptr)
    {
        wxLogError( wxT("Cannot allocate RAM for RGB data in file.") );
        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)
                    {
                        wxLogError( wxT("Can't 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
700ec454	67	bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream, bool WXUNUSED(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	{
223d09f6	100	wxLogError( wxT("Image width > 32767 pixels for file.") );
e65ed37a RR	101	return FALSE;
	102	}
	103	if (height > 32767)
	104	{
223d09f6	105	wxLogError( wxT("Image height > 32767 pixels for file.") );
e65ed37a RR	106	return FALSE;
e65ed37a RR	107	}
31528cd3	108
e65ed37a RR	109	stream.Read( &aWord, 2 );
	110	/*
	111	TODO
	112	int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
	113	*/
	114	stream.Read( &aWord, 2 );
	115	int bpp = (int)wxUINT16_SWAP_ON_BE( aWord );
	116	if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32)
	117	{
223d09f6	118	wxLogError( wxT("unknown bitdepth in file.") );
e65ed37a RR	119	return FALSE;
e65ed37a RR	120	}
31528cd3	121
e65ed37a RR	122	stream.Read( dbuf, 4 * 4 );
	123	int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
	124	if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
	125	{
223d09f6	126	wxLogError( wxT("unknown encoding in Windows BMP file.") );
e65ed37a RR	127	return FALSE;
e65ed37a RR	128	}
31528cd3	129
e65ed37a RR	130	stream.Read( dbuf, 4 * 2 );
	131	int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
	132	if (ncolors == 0)
	133	ncolors = 1 << bpp;
	134	/* some more sanity checks */
31528cd3 VZ	135	if (((comp == BI_RLE4) && (bpp != 4)) \|\|
	136	((comp == BI_RLE8) && (bpp != 8)) \|\|
	137	((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
e65ed37a	138	{
223d09f6	139	wxLogError( wxT("encoding of BMP doesn't match bitdepth.") );
e65ed37a RR	140	return FALSE;
	141	}
	142	if (bpp < 16)
	143	{
	144	cmap = (struct _cmap )malloc(sizeof(struct _cmap) ncolors);
	145	if (!cmap)
	146	{
223d09f6	147	wxLogError( wxT("Cannot allocate RAM for color map in BMP file.") );
e65ed37a RR	148	return FALSE;
	149	}
	150	}
	151	else
	152	cmap = NULL;
	153
	154	image->Create( width, height );
	155	unsigned char *ptr = image->GetData();
	156	if (!ptr)
	157	{
223d09f6	158	wxLogError( wxT("Cannot allocate RAM for RGB data in file.") );
e65ed37a RR	159	if (cmap)
	160	free(cmap);
	161	return FALSE;
	162	}
	163
	164	/*
	165	* Reading the palette, if it exists.
	166	*/
	167	if (bpp < 16 && ncolors != 0)
	168	{
	169	for (int j = 0; j < ncolors; j++)
	170	{
	171	stream.Read( bbuf, 4 );
	172	cmap[j].b = bbuf[0];
	173	cmap[j].g = bbuf[1];
	174	cmap[j].r = bbuf[2];
	175	}
	176	}
	177	else if (bpp == 16 \|\| bpp == 32)
	178	{
	179	if (comp == BI_BITFIELDS)
	180	{
	181	int bit = 0;
	182	stream.Read( dbuf, 4 * 3 );
	183	bmask = wxINT32_SWAP_ON_BE( dbuf[0] );
	184	gmask = wxINT32_SWAP_ON_BE( dbuf[1] );
	185	rmask = wxINT32_SWAP_ON_BE( dbuf[2] );
	186	/* find shift amount.. ugly, but i can't think of a better way */
	187	for (bit = 0; bit < bpp; bit++)
	188	{
	189	if (bmask & (1 << bit))
	190	bshift = bit;
	191	if (gmask & (1 << bit))
	192	gshift = bit;
	193	if (rmask & (1 << bit))
	194	rshift = bit;
	195	}
	196	}
	197	else if (bpp == 16)
	198	{
	199	rmask = 0x7C00;
	200	gmask = 0x03E0;
	201	bmask = 0x001F;
	202	rshift = 10;
	203	gshift = 5;
	204	bshift = 0;
	205	}
	206	else if (bpp == 32)
	207	{
	208	rmask = 0x00FF0000;
	209	gmask = 0x0000FF00;
	210	bmask = 0x000000FF;
	211	rshift = 16;
	212	gshift = 8;
	213	bshift = 0;
	214	}
	215	}
	216
	217	/*
	218	* Reading the image data
	219	*/
	220	stream.SeekI( start_offset + offset );
	221	unsigned char *data = ptr;
	222
223	/* set the whole image to the background color */
224	if (bpp < 16 && (comp == BI_RLE4 \|\| comp == BI_RLE8))
225	{
226	for (int i = 0; i < width * height; i++)
227	{
228	*ptr++ = cmap[0].r;
229	*ptr++ = cmap[0].g;
230	*ptr++ = cmap[0].b;
231	}
232	ptr = data;
233	}
31528cd3	234
e65ed37a RR	235	int line = 0;
	236	int column = 0;
	237	int linesize = ((width * bpp + 31) / 32) * 4;
	238
	239	/* BMPs are stored upside down */
31528cd3	240	for (line = (height - 1); line >= 0; line--)
e65ed37a RR	241	{
	242	int linepos = 0;
	243	for (column = 0; column < width;)
	244	{
	245	if (bpp < 16)
	246	{
	247	int index = 0;
	248	linepos++;
	249	aByte = stream.GetC();
	250	if (bpp == 1)
	251	{
	252	int bit = 0;
	253	for (bit = 0; bit < 8; bit++)
	254	{
	255	index = ((aByte & (0x80 >> bit)) ? 1 : 0);
	256	ptr[poffset] = cmap[index].r;
	257	ptr[poffset + 1] = cmap[index].g;
	258	ptr[poffset + 2] = cmap[index].b;
	259	column++;
	260	}
	261	}
	262	else if (bpp == 4)
	263	{
	264	if (comp == BI_RLE4)
	265	{
223d09f6	266	wxLogError( wxT("Can't deal with 4bit encoded yet.") );
e65ed37a RR	267	image->Destroy();
	268	free(cmap);
	269	return FALSE;
	270	}
	271	else
	272	{
	273	int nibble = 0;
	274	for (nibble = 0; nibble < 2; nibble++)
	275	{
	276	index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
	277	if (index >= 16)
	278	index = 15;
	279	ptr[poffset] = cmap[index].r;
	280	ptr[poffset + 1] = cmap[index].g;
	281	ptr[poffset + 2] = cmap[index].b;
	282	column++;
	283	}
	284	}
	285	}
	286	else if (bpp == 8)
	287	{
	288	if (comp == BI_RLE8)
	289	{
	290	unsigned char first;
	291	first = aByte;
	292	aByte = stream.GetC();
	293	if (first == 0)
	294	{
	295	if (aByte == 0)
	296	{
	297	/* column = width; */
	298	}
	299	else if (aByte == 1)
	300	{
	301	column = width;
	302	line = -1;
	303	}
	304	else if (aByte == 2)
	305	{
	306	aByte = stream.GetC();
	307	column += aByte;
	308	linepos = column * bpp / 8;
	309	aByte = stream.GetC();
	310	line += aByte;
	311	}
	312	else
	313	{
	314	int absolute = aByte;
	315	for (int k = 0; k < absolute; k++)
	316	{
	317	linepos++;
	318	aByte = stream.GetC();
	319	ptr[poffset ] = cmap[aByte].r;
	320	ptr[poffset + 1] = cmap[aByte].g;
	321	ptr[poffset + 2] = cmap[aByte].b;
	322	column++;
	323	}
	324	if (absolute & 0x01)
	325	aByte = stream.GetC();
	326	}
	327	}
	328	else
	329	{
	330	for (int l = 0; l < first; l++)
331	{
332	ptr[poffset ] = cmap[aByte].r;
333	ptr[poffset + 1] = cmap[aByte].g;
334	ptr[poffset + 2] = cmap[aByte].b;
335	column++;
336	linepos++;
337	}
338	}
339	}
340	else
341	{
342	ptr[poffset ] = cmap[aByte].r;
343	ptr[poffset + 1] = cmap[aByte].g;
344	ptr[poffset + 2] = cmap[aByte].b;
345	column++;
953704c1	346	// linepos += size; seems to be wrong, RR
e65ed37a RR	347	}
	348	}
	349	}
	350	else if (bpp == 24)
	351	{
	352	stream.Read( &bbuf, 3 );
	353	linepos += 3;
	354	ptr[poffset ] = (unsigned char)bbuf[2];
	355	ptr[poffset + 1] = (unsigned char)bbuf[1];
	356	ptr[poffset + 2] = (unsigned char)bbuf[0];
	357	column++;
	358	}
	359	else if (bpp == 16)
	360	{
	361	unsigned char temp;
	362	stream.Read( &aWord, 2 );
31528cd3	363	aWord = wxUINT16_SWAP_ON_BE( aWord );
e65ed37a RR	364	linepos += 2;
	365	temp = (aWord & rmask) >> rshift;
	366	ptr[poffset] = temp;
	367	temp = (aWord & gmask) >> gshift;
	368	ptr[poffset + 1] = temp;
e115e771	369	temp = (aWord & bmask) >> bshift;
e65ed37a RR	370	ptr[poffset + 2] = temp;
	371	column++;
	372	}
	373	else
	374	{
	375	unsigned char temp;
	376	stream.Read( &aDword, 4 );
31528cd3	377	aDword = wxINT32_SWAP_ON_BE( aDword );
e65ed37a RR	378	linepos += 4;
	379	temp = (aDword & rmask) >> rshift;
	380	ptr[poffset] = temp;
	381	temp = (aDword & gmask) >> gshift;
	382	ptr[poffset + 1] = temp;
	383	temp = (aDword & bmask) >> bshift;
	384	ptr[poffset + 2] = temp;
	385	column++;
	386	}
	387	}
	388	while ((linepos < linesize) && (comp != 1) && (comp != 2))
	389	{
	390	stream.Read( &aByte, 1 );
	391	linepos += 1;
	392	if (stream.LastError() != wxStream_NOERROR)
	393	break;
	394	}
	395	}
31528cd3	396	if (cmap)
e65ed37a RR	397	free(cmap);
	398
	399	image->SetMask( FALSE );
	400
	401	return TRUE;
	402	}
	403
995612e2	404	bool wxBMPHandler::DoCanRead( wxInputStream& stream )
0828c087 VS	405	{
0828c087 VS	406	unsigned char hdr[2];
995612e2	407
0828c087 VS	408	stream.Read(&hdr, 2);
	409	stream.SeekI(-2, wxFromCurrent);
	410	return (hdr[0] == 'B' && hdr[1] == 'M');
	411	}
	412
e65ed37a RR	413	#endif // wxUSE_STREAMS
	414
	415