[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 )
{
    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 );

    wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] );
    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( _T("Image width > 32767 pixels for file.") );
        return FALSE;
    }
    if (height > 32767)
    {
        wxLogError( _T("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( _T("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( _T("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( _T("encoding of BMP doesn't match bitdepth.") );
        return FALSE;
    }
    if (bpp < 16)
    {
        cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors);
        if (!cmap)
        {
            wxLogError( _T("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( _T("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( _T("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;
                    }
                }
               }
               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) >> gshift;
                   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;
}

#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
67	bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream )
68	{
69	int rshift = 0, gshift = 0, bshift = 0;
70	wxUint8 aByte;
71	wxUint16 aWord;
72	wxInt32 dbuf[4], aDword,
73	rmask = 0, gmask = 0, bmask = 0;
74	wxInt8 bbuf[4];
75	struct _cmap {
76	unsigned char r, g, b;
77	} *cmap = NULL;
78
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
90	wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] );
91	wxInt32 offset = wxINT32_SWAP_ON_BE( dbuf[2] );
92
93	stream.Read(dbuf, 4 * 2);
94	int width = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
95	int height = (int)wxINT32_SWAP_ON_BE( dbuf[1] );
96	if (width > 32767)
97	{
98	wxLogError( _T("Image width > 32767 pixels for file.") );
99	return FALSE;
100	}
101	if (height > 32767)
102	{
103	wxLogError( _T("Image height > 32767 pixels for file.") );
104	return FALSE;
105	}
106
107	stream.Read( &aWord, 2 );
108	/*
109	TODO
110	int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
111	*/
112	stream.Read( &aWord, 2 );
113	int bpp = (int)wxUINT16_SWAP_ON_BE( aWord );
114	if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32)
115	{
116	wxLogError( _T("unknown bitdepth in file.") );
117	return FALSE;
118	}
119
120	stream.Read( dbuf, 4 * 4 );
121	int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
122	if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
123	{
124	wxLogError( _T("unknown encoding in Windows BMP file.") );
125	return FALSE;
126	}
127
128	stream.Read( dbuf, 4 * 2 );
129	int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
130	if (ncolors == 0)
131	ncolors = 1 << bpp;
132	/* some more sanity checks */
133	if (((comp == BI_RLE4) && (bpp != 4)) \|\|
134	((comp == BI_RLE8) && (bpp != 8)) \|\|
135	((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
136	{
137	wxLogError( _T("encoding of BMP doesn't match bitdepth.") );
138	return FALSE;
139	}
140	if (bpp < 16)
141	{
142	cmap = (struct _cmap )malloc(sizeof(struct _cmap) ncolors);
143	if (!cmap)
144	{
145	wxLogError( _T("Cannot allocate RAM for color map in BMP file.") );
146	return FALSE;
147	}
148	}
149	else
150	cmap = NULL;
151
152	image->Create( width, height );
153	unsigned char *ptr = image->GetData();
154	if (!ptr)
155	{
156	wxLogError( _T("Cannot allocate RAM for RGB data in file.") );
157	if (cmap)
158	free(cmap);
159	return FALSE;
160	}
161
162	/*
163	* Reading the palette, if it exists.
164	*/
165	if (bpp < 16 && ncolors != 0)
166	{
167	for (int j = 0; j < ncolors; j++)
168	{
169	stream.Read( bbuf, 4 );
170	cmap[j].b = bbuf[0];
171	cmap[j].g = bbuf[1];
172	cmap[j].r = bbuf[2];
173	}
174	}
175	else if (bpp == 16 \|\| bpp == 32)
176	{
177	if (comp == BI_BITFIELDS)
178	{
179	int bit = 0;
180	stream.Read( dbuf, 4 * 3 );
181	bmask = wxINT32_SWAP_ON_BE( dbuf[0] );
182	gmask = wxINT32_SWAP_ON_BE( dbuf[1] );
183	rmask = wxINT32_SWAP_ON_BE( dbuf[2] );
184	/* find shift amount.. ugly, but i can't think of a better way */
185	for (bit = 0; bit < bpp; bit++)
186	{
187	if (bmask & (1 << bit))
188	bshift = bit;
189	if (gmask & (1 << bit))
190	gshift = bit;
191	if (rmask & (1 << bit))
192	rshift = bit;
193	}
194	}
195	else if (bpp == 16)
196	{
197	rmask = 0x7C00;
198	gmask = 0x03E0;
199	bmask = 0x001F;
200	rshift = 10;
201	gshift = 5;
202	bshift = 0;
203	}
204	else if (bpp == 32)
205	{
206	rmask = 0x00FF0000;
207	gmask = 0x0000FF00;
208	bmask = 0x000000FF;
209	rshift = 16;
210	gshift = 8;
211	bshift = 0;
212	}
213	}
214
215	/*
216	* Reading the image data
217	*/
218	stream.SeekI( start_offset + offset );
219	unsigned char *data = ptr;
220
221	/* set the whole image to the background color */
222	if (bpp < 16 && (comp == BI_RLE4 \|\| comp == BI_RLE8))
223	{
224	for (int i = 0; i < width * height; i++)
225	{
226	*ptr++ = cmap[0].r;
227	*ptr++ = cmap[0].g;
228	*ptr++ = cmap[0].b;
229	}
230	ptr = data;
231	}
232
233	int line = 0;
234	int column = 0;
235	int linesize = ((width * bpp + 31) / 32) * 4;
236
237	/* BMPs are stored upside down */
238	for (line = (height - 1); line >= 0; line--)
239	{
240	int linepos = 0;
241	for (column = 0; column < width;)
242	{
243	if (bpp < 16)
244	{
245	int index = 0;
246	linepos++;
247	aByte = stream.GetC();
248	if (bpp == 1)
249	{
250	int bit = 0;
251	for (bit = 0; bit < 8; bit++)
252	{
253	index = ((aByte & (0x80 >> bit)) ? 1 : 0);
254	ptr[poffset] = cmap[index].r;
255	ptr[poffset + 1] = cmap[index].g;
256	ptr[poffset + 2] = cmap[index].b;
257	column++;
258	}
259	}
260	else if (bpp == 4)
261	{
262	if (comp == BI_RLE4)
263	{
264	wxLogError( _T("Can't deal with 4bit encoded yet.") );
265	image->Destroy();
266	free(cmap);
267	return FALSE;
268	}
269	else
270	{
271	int nibble = 0;
272	for (nibble = 0; nibble < 2; nibble++)
273	{
274	index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
275	if (index >= 16)
276	index = 15;
277	ptr[poffset] = cmap[index].r;
278	ptr[poffset + 1] = cmap[index].g;
279	ptr[poffset + 2] = cmap[index].b;
280	column++;
281	}
282	}
283	}
284	else if (bpp == 8)
285	{
286	if (comp == BI_RLE8)
287	{
288	unsigned char first;
289	first = aByte;
290	aByte = stream.GetC();
291	if (first == 0)
292	{
293	if (aByte == 0)
294	{
295	/* column = width; */
296	}
297	else if (aByte == 1)
298	{
299	column = width;
300	line = -1;
301	}
302	else if (aByte == 2)
303	{
304	aByte = stream.GetC();
305	column += aByte;
306	linepos = column * bpp / 8;
307	aByte = stream.GetC();
308	line += aByte;
309	}
310	else
311	{
312	int absolute = aByte;
313	for (int k = 0; k < absolute; k++)
314	{
315	linepos++;
316	aByte = stream.GetC();
317	ptr[poffset ] = cmap[aByte].r;
318	ptr[poffset + 1] = cmap[aByte].g;
319	ptr[poffset + 2] = cmap[aByte].b;
320	column++;
321	}
322	if (absolute & 0x01)
323	aByte = stream.GetC();
324	}
325	}
326	else
327	{
328	for (int l = 0; l < first; l++)
329	{
330	ptr[poffset ] = cmap[aByte].r;
331	ptr[poffset + 1] = cmap[aByte].g;
332	ptr[poffset + 2] = cmap[aByte].b;
333	column++;
334	linepos++;
335	}
336	}
337	}
338	else
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 += size;
345	}
346	}
347	}
348	else if (bpp == 24)
349	{
350	stream.Read( &bbuf, 3 );
351	linepos += 3;
352	ptr[poffset ] = (unsigned char)bbuf[2];
353	ptr[poffset + 1] = (unsigned char)bbuf[1];
354	ptr[poffset + 2] = (unsigned char)bbuf[0];
355	column++;
356	}
357	else if (bpp == 16)
358	{
359	unsigned char temp;
360	stream.Read( &aWord, 2 );
361	aWord = wxUINT16_SWAP_ON_BE( aWord );
362	linepos += 2;
363	temp = (aWord & rmask) >> rshift;
364	ptr[poffset] = temp;
365	temp = (aWord & gmask) >> gshift;
366	ptr[poffset + 1] = temp;
367	temp = (aWord & bmask) >> gshift;
368	ptr[poffset + 2] = temp;
369	column++;
370	}
371	else
372	{
373	unsigned char temp;
374	stream.Read( &aDword, 4 );
375	aDword = wxINT32_SWAP_ON_BE( aDword );
376	linepos += 4;
377	temp = (aDword & rmask) >> rshift;
378	ptr[poffset] = temp;
379	temp = (aDword & gmask) >> gshift;
380	ptr[poffset + 1] = temp;
381	temp = (aDword & bmask) >> bshift;
382	ptr[poffset + 2] = temp;
383	column++;
384	}
385	}
386	while ((linepos < linesize) && (comp != 1) && (comp != 2))
387	{
388	stream.Read( &aByte, 1 );
389	linepos += 1;
390	if (stream.LastError() != wxStream_NOERROR)
391	break;
392	}
393	}
394	if (cmap)
395	free(cmap);
396
397	image->SetMask( FALSE );
398
399	return TRUE;
400	}
401
402	#endif // wxUSE_STREAMS
403
404