e115e77131
Put some life into iODBC again, git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3906 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
416 lines
12 KiB
C++
416 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: imagbmp.cpp
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// Purpose: wxImage BMP handler
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// Author: Robert Roebling
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// RCS-ID: $Id$
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// Copyright: (c) Robert Roebling
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/*
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We don't put pragma implement in this file because it is already present in
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src/common/image.cpp
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*/
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include "wx/image.h"
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#include "wx/bitmap.h"
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#include "wx/debug.h"
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#include "wx/log.h"
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#include "wx/app.h"
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#include "wx/filefn.h"
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#include "wx/wfstream.h"
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#include "wx/intl.h"
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#include "wx/module.h"
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// For memcpy
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#include <string.h>
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#ifdef __SALFORDC__
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#ifdef FAR
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#undef FAR
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#endif
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#endif
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#ifdef __WXMSW__
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#include <windows.h>
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#endif
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//-----------------------------------------------------------------------------
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// wxBMPHandler
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//-----------------------------------------------------------------------------
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#if !USE_SHARED_LIBRARIES
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IMPLEMENT_DYNAMIC_CLASS(wxBMPHandler,wxImageHandler)
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#endif
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#if wxUSE_STREAMS
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#ifndef BI_RGB
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#define BI_RGB 0
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#define BI_RLE8 1
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#define BI_RLE4 2
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#endif
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#ifndef BI_BITFIELDS
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#define BI_BITFIELDS 3
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#endif
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#define poffset (line * width * 3 + column * 3)
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bool wxBMPHandler::LoadFile( wxImage *image, wxInputStream& stream, bool WXUNUSED(verbose) )
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{
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int rshift = 0, gshift = 0, bshift = 0;
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wxUint8 aByte;
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wxUint16 aWord;
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wxInt32 dbuf[4], aDword,
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rmask = 0, gmask = 0, bmask = 0;
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wxInt8 bbuf[4];
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struct _cmap {
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unsigned char r, g, b;
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} *cmap = NULL;
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off_t start_offset = stream.TellI();
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image->Destroy();
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/*
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* Read the BMP header
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*/
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stream.Read( &bbuf, 2 );
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stream.Read( dbuf, 4 * 4 );
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#if 0 // unused
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wxInt32 size = wxINT32_SWAP_ON_BE( dbuf[0] );
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#endif
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wxInt32 offset = wxINT32_SWAP_ON_BE( dbuf[2] );
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stream.Read(dbuf, 4 * 2);
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int width = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
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int height = (int)wxINT32_SWAP_ON_BE( dbuf[1] );
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if (width > 32767)
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{
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wxLogError( wxT("Image width > 32767 pixels for file.") );
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return FALSE;
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}
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if (height > 32767)
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{
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wxLogError( wxT("Image height > 32767 pixels for file.") );
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return FALSE;
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}
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stream.Read( &aWord, 2 );
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/*
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TODO
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int planes = (int)wxUINT16_SWAP_ON_BE( aWord );
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*/
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stream.Read( &aWord, 2 );
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int bpp = (int)wxUINT16_SWAP_ON_BE( aWord );
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if (bpp != 1 && bpp != 4 && bpp != 8 && bpp != 16 && bpp != 24 && bpp != 32)
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{
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wxLogError( wxT("unknown bitdepth in file.") );
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return FALSE;
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}
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stream.Read( dbuf, 4 * 4 );
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int comp = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
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if (comp != BI_RGB && comp != BI_RLE4 && comp != BI_RLE8 && comp != BI_BITFIELDS)
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{
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wxLogError( wxT("unknown encoding in Windows BMP file.") );
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return FALSE;
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}
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stream.Read( dbuf, 4 * 2 );
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int ncolors = (int)wxINT32_SWAP_ON_BE( dbuf[0] );
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if (ncolors == 0)
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ncolors = 1 << bpp;
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/* some more sanity checks */
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if (((comp == BI_RLE4) && (bpp != 4)) ||
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((comp == BI_RLE8) && (bpp != 8)) ||
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((comp == BI_BITFIELDS) && (bpp != 16 && bpp != 32)))
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{
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wxLogError( wxT("encoding of BMP doesn't match bitdepth.") );
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return FALSE;
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}
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if (bpp < 16)
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{
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cmap = (struct _cmap *)malloc(sizeof(struct _cmap) * ncolors);
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if (!cmap)
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{
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wxLogError( wxT("Cannot allocate RAM for color map in BMP file.") );
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return FALSE;
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}
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}
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else
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cmap = NULL;
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image->Create( width, height );
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unsigned char *ptr = image->GetData();
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if (!ptr)
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{
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wxLogError( wxT("Cannot allocate RAM for RGB data in file.") );
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if (cmap)
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free(cmap);
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return FALSE;
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}
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/*
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* Reading the palette, if it exists.
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*/
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if (bpp < 16 && ncolors != 0)
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{
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for (int j = 0; j < ncolors; j++)
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{
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stream.Read( bbuf, 4 );
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cmap[j].b = bbuf[0];
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cmap[j].g = bbuf[1];
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cmap[j].r = bbuf[2];
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}
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}
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else if (bpp == 16 || bpp == 32)
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{
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if (comp == BI_BITFIELDS)
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{
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int bit = 0;
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stream.Read( dbuf, 4 * 3 );
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bmask = wxINT32_SWAP_ON_BE( dbuf[0] );
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gmask = wxINT32_SWAP_ON_BE( dbuf[1] );
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rmask = wxINT32_SWAP_ON_BE( dbuf[2] );
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/* find shift amount.. ugly, but i can't think of a better way */
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for (bit = 0; bit < bpp; bit++)
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{
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if (bmask & (1 << bit))
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bshift = bit;
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if (gmask & (1 << bit))
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gshift = bit;
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if (rmask & (1 << bit))
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rshift = bit;
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}
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}
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else if (bpp == 16)
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{
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rmask = 0x7C00;
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gmask = 0x03E0;
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bmask = 0x001F;
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rshift = 10;
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gshift = 5;
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bshift = 0;
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}
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else if (bpp == 32)
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{
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rmask = 0x00FF0000;
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gmask = 0x0000FF00;
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bmask = 0x000000FF;
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rshift = 16;
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gshift = 8;
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bshift = 0;
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}
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}
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/*
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* Reading the image data
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*/
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stream.SeekI( start_offset + offset );
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unsigned char *data = ptr;
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/* set the whole image to the background color */
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if (bpp < 16 && (comp == BI_RLE4 || comp == BI_RLE8))
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{
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for (int i = 0; i < width * height; i++)
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{
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*ptr++ = cmap[0].r;
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*ptr++ = cmap[0].g;
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*ptr++ = cmap[0].b;
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}
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ptr = data;
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}
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int line = 0;
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int column = 0;
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int linesize = ((width * bpp + 31) / 32) * 4;
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/* BMPs are stored upside down */
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for (line = (height - 1); line >= 0; line--)
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{
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int linepos = 0;
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for (column = 0; column < width;)
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{
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if (bpp < 16)
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{
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int index = 0;
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linepos++;
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aByte = stream.GetC();
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if (bpp == 1)
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{
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int bit = 0;
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for (bit = 0; bit < 8; bit++)
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{
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index = ((aByte & (0x80 >> bit)) ? 1 : 0);
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ptr[poffset] = cmap[index].r;
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ptr[poffset + 1] = cmap[index].g;
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ptr[poffset + 2] = cmap[index].b;
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column++;
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}
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}
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else if (bpp == 4)
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{
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if (comp == BI_RLE4)
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{
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wxLogError( wxT("Can't deal with 4bit encoded yet.") );
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image->Destroy();
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free(cmap);
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return FALSE;
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}
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else
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{
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int nibble = 0;
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for (nibble = 0; nibble < 2; nibble++)
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{
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index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
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if (index >= 16)
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index = 15;
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ptr[poffset] = cmap[index].r;
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ptr[poffset + 1] = cmap[index].g;
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ptr[poffset + 2] = cmap[index].b;
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column++;
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}
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}
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}
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else if (bpp == 8)
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{
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if (comp == BI_RLE8)
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{
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unsigned char first;
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first = aByte;
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aByte = stream.GetC();
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if (first == 0)
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{
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if (aByte == 0)
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{
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/* column = width; */
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}
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else if (aByte == 1)
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{
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column = width;
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line = -1;
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}
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else if (aByte == 2)
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{
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aByte = stream.GetC();
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column += aByte;
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linepos = column * bpp / 8;
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aByte = stream.GetC();
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line += aByte;
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}
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else
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{
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int absolute = aByte;
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for (int k = 0; k < absolute; k++)
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{
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linepos++;
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aByte = stream.GetC();
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ptr[poffset ] = cmap[aByte].r;
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ptr[poffset + 1] = cmap[aByte].g;
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ptr[poffset + 2] = cmap[aByte].b;
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column++;
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}
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if (absolute & 0x01)
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aByte = stream.GetC();
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}
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}
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else
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{
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for (int l = 0; l < first; l++)
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{
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ptr[poffset ] = cmap[aByte].r;
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ptr[poffset + 1] = cmap[aByte].g;
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ptr[poffset + 2] = cmap[aByte].b;
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column++;
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linepos++;
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}
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}
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}
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else
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{
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ptr[poffset ] = cmap[aByte].r;
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ptr[poffset + 1] = cmap[aByte].g;
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ptr[poffset + 2] = cmap[aByte].b;
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column++;
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// linepos += size; seems to be wrong, RR
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}
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}
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}
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else if (bpp == 24)
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{
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stream.Read( &bbuf, 3 );
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linepos += 3;
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ptr[poffset ] = (unsigned char)bbuf[2];
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ptr[poffset + 1] = (unsigned char)bbuf[1];
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ptr[poffset + 2] = (unsigned char)bbuf[0];
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column++;
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}
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else if (bpp == 16)
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{
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unsigned char temp;
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stream.Read( &aWord, 2 );
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aWord = wxUINT16_SWAP_ON_BE( aWord );
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linepos += 2;
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temp = (aWord & rmask) >> rshift;
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ptr[poffset] = temp;
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temp = (aWord & gmask) >> gshift;
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ptr[poffset + 1] = temp;
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temp = (aWord & bmask) >> bshift;
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ptr[poffset + 2] = temp;
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column++;
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}
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else
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{
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unsigned char temp;
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stream.Read( &aDword, 4 );
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aDword = wxINT32_SWAP_ON_BE( aDword );
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linepos += 4;
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temp = (aDword & rmask) >> rshift;
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ptr[poffset] = temp;
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temp = (aDword & gmask) >> gshift;
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ptr[poffset + 1] = temp;
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temp = (aDword & bmask) >> bshift;
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ptr[poffset + 2] = temp;
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column++;
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}
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}
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while ((linepos < linesize) && (comp != 1) && (comp != 2))
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{
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stream.Read( &aByte, 1 );
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linepos += 1;
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if (stream.LastError() != wxStream_NOERROR)
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break;
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}
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}
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if (cmap)
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free(cmap);
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image->SetMask( FALSE );
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return TRUE;
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}
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bool wxBMPHandler::CanRead( wxInputStream& stream )
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{
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unsigned char hdr[2];
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stream.Read(&hdr, 2);
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stream.SeekI(-2, wxFromCurrent);
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return (hdr[0] == 'B' && hdr[1] == 'M');
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}
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#endif // wxUSE_STREAMS
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