/*
TODO: support for palettes is very incomplete, several functions simply
ignore them (we should select and realize the palette, if any, before
- caling GetDIBits() in the DC we use with it and we shouldn't use
- GetBitmapBits() at all because we can't do it with it)
+ caling GetDIBits() in the DC we use with it.
*/
// ============================================================================
#include "wx/log.h"
#endif //WX_PRECOMP
+#if wxUSE_WXDIB
+
#include "wx/bitmap.h"
#include "wx/intl.h"
#include "wx/file.h"
#include <stdlib.h>
#if !defined(__MWERKS__) && !defined(__SALFORDC__)
-#include <memory.h>
-#endif
-
-#ifdef __GNUWIN32_OLD__
- #include "wx/msw/gnuwin32/extra.h"
+ #include <memory.h>
#endif
#include "wx/image.h"
#include "wx/msw/dib.h"
+#ifdef __WXWINCE__
+ #include <shellapi.h> // for SHLoadDIBitmap()
+#endif
+
// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------
// calculate the number of palette entries needed for the bitmap with this
// number of bits per pixel
-static WORD wxGetNumOfBitmapColors(WORD bitsPerPixel)
+static inline WORD GetNumberOfColours(WORD bitsPerPixel)
{
// only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
// 24bpp ones too but we don't support this as I think it's quite uncommon)
- return bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0;
+ return (WORD)(bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0);
+}
+
+// wrapper around ::GetObject() for DIB sections
+static inline bool GetDIBSection(HBITMAP hbmp, DIBSECTION *ds)
+{
+ // note that at least under Win9x (this doesn't seem to happen under Win2K
+ // but this doesn't mean anything, of course), GetObject() may return
+ // sizeof(DIBSECTION) for a bitmap which is *not* a DIB section and the way
+ // to check for it is by looking at the bits pointer
+ return ::GetObject(hbmp, sizeof(DIBSECTION), ds) == sizeof(DIBSECTION) &&
+ ds->dsBm.bmBits;
}
// ============================================================================
bool wxDIB::Create(int width, int height, int depth)
{
- // we don't handle the palette yet
- wxASSERT_MSG( depth == 24 || depth == 32,
- _T("unsupported image depth in wxDIB::Create()") );
+ // we don't support formats using palettes right now so we only create
+ // either 24bpp (RGB) or 32bpp (RGBA) bitmaps
+ wxASSERT_MSG( depth, _T("invalid image depth in wxDIB::Create()") );
+ if ( depth < 24 )
+ depth = 24;
- static const int infosize = sizeof(BITMAPINFOHEADER);
+ // allocate memory for bitmap structures
+ static const int sizeHeader = sizeof(BITMAPINFOHEADER);
- BITMAPINFO *info = (BITMAPINFO *)malloc(infosize);
- wxCHECK_MSG( info, NULL, _T("malloc(BITMAPINFO) failed") );
+ BITMAPINFO *info = (BITMAPINFO *)malloc(sizeHeader);
+ wxCHECK_MSG( info, false, _T("malloc(BITMAPINFO) failed") );
- memset(info, 0, infosize);
+ memset(info, 0, sizeHeader);
- info->bmiHeader.biSize = infosize;
+ info->bmiHeader.biSize = sizeHeader;
info->bmiHeader.biWidth = width;
// we use positive height here which corresponds to a DIB with normal, i.e.
info->bmiHeader.biHeight = height;
info->bmiHeader.biPlanes = 1;
- info->bmiHeader.biBitCount = depth;
+ info->bmiHeader.biBitCount = (WORD)depth;
info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
m_handle = ::CreateDIBSection
{
wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
+ if ( !Create(GetHbitmapOf(bmp)) )
+ return false;
+
+ m_hasAlpha = bmp.HasAlpha();
+
+ return true;
+}
+
+bool wxDIB::Create(HBITMAP hbmp)
+{
// this bitmap could already be a DIB section in which case we don't need
// to convert it to DIB
- HBITMAP hbmp = GetHbitmapOf(bmp);
-
DIBSECTION ds;
- if ( ::GetObject(hbmp, sizeof(ds), &ds) == sizeof(ds) )
+ if ( GetDIBSection(hbmp, &ds) )
{
m_handle = hbmp;
}
else // no, it's a DDB -- convert it to DIB
{
- const int w = bmp.GetWidth();
- const int h = bmp.GetHeight();
- int d = bmp.GetDepth();
- if ( d == -1 )
+ // prepare all the info we need
+ BITMAP bm;
+ if ( !::GetObject(hbmp, sizeof(bm), &bm) )
+ {
+ wxLogLastError(wxT("GetObject(bitmap)"));
+
+ return false;
+ }
+
+ int d = bm.bmBitsPixel;
+ if ( d <= 0 )
d = wxDisplayDepth();
- if ( !Create(w, h, d) )
+ if ( !Create(bm.bmWidth, bm.bmHeight, d) || !CopyFromDDB(hbmp) )
return false;
+ }
- // we could have used GetDIBits() too but GetBitmapBits() is simpler
- if ( !::GetBitmapBits
- (
- GetHbitmapOf(bmp), // the source DDB
- GetLineSize(w, d)*h, // the number of bytes to copy
- m_data // the pixels will be copied here
- ) )
- {
- wxLogLastError(wxT("GetDIBits()"));
+ return true;
+}
- return 0;
- }
+// Windows CE doesn't have GetDIBits() so use an alternative implementation
+// for it
+//
+// in fact I'm not sure if GetDIBits() is really much better than using
+// BitBlt() like this -- it should be faster but I didn't do any tests, if
+// anybody has time to do them and by chance finds that GetDIBits() is not
+// much faster than BitBlt(), we could always use the Win CE version here
+#ifdef __WXWINCE__
+
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+ MemoryHDC hdcSrc;
+ if ( !hdcSrc )
+ return false;
+
+ SelectInHDC selectSrc(hdcSrc, hbmp);
+ if ( !selectSrc )
+ return false;
+
+ MemoryHDC hdcDst;
+ if ( !hdcDst )
+ return false;
+
+ SelectInHDC selectDst(hdcDst, m_handle);
+ if ( !selectDst )
+ return false;
+
+
+ if ( !::BitBlt(
+ hdcDst,
+ 0, 0, m_width, m_height,
+ hdcSrc,
+ 0, 0,
+ SRCCOPY
+ ) )
+ {
+ wxLogLastError(_T("BitBlt(DDB -> DIB)"));
+
+ return false;
+ }
+
+ return true;
+}
+
+#else // !__WXWINCE__
+
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ // we're sure that our handle is a DIB section, so this should work
+ wxFAIL_MSG( _T("GetObject(DIBSECTION) unexpectedly failed") );
+
+ return false;
+ }
+
+ if ( !::GetDIBits
+ (
+ ScreenHDC(), // the DC to use
+ hbmp, // the source DDB
+ 0, // first scan line
+ m_height, // number of lines to copy
+ ds.dsBm.bmBits, // pointer to the buffer
+ (BITMAPINFO *)&ds.dsBmih, // bitmap header
+ DIB_RGB_COLORS // and not DIB_PAL_COLORS
+ ) )
+ {
+ wxLogLastError(wxT("GetDIBits()"));
+
+ return false;
}
return true;
}
+#endif // __WXWINCE__/!__WXWINCE__
+
// ----------------------------------------------------------------------------
// Loading/saving the DIBs
// ----------------------------------------------------------------------------
bool wxDIB::Load(const wxString& filename)
{
+#ifdef __WXWINCE__
+ m_handle = SHLoadDIBitmap(filename);
+#else // !__WXWINCE__
m_handle = (HBITMAP)::LoadImage
(
wxGetInstance(),
0, 0, // don't specify the size
LR_CREATEDIBSECTION | LR_LOADFROMFILE
);
+#endif // __WXWINCE__
+
if ( !m_handle )
{
- wxLogLastError(_T("LoadImage(LR_CREATEDIBSECTION | LR_LOADFROMFILE)"));
+ wxLogLastError(_T("Loading DIB from file"));
return false;
}
if ( ok )
{
DIBSECTION ds;
- if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+ if ( !GetDIBSection(m_handle, &ds) )
{
wxLogLastError(_T("GetObject(hDIB)"));
}
// check for this now rather than trying to find out why it doesn't
// work later
DIBSECTION ds;
- if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+ if ( !GetDIBSection(m_handle, &ds) )
{
wxLogLastError(_T("GetObject(hDIB)"));
return;
// DDB <-> DIB conversions
// ----------------------------------------------------------------------------
+#ifndef __WXWINCE__
+
HBITMAP wxDIB::CreateDDB(HDC hdc) const
{
wxCHECK_MSG( m_handle, 0, _T("wxDIB::CreateDDB(): invalid object") );
DIBSECTION ds;
- if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+ if ( !GetDIBSection(m_handle, &ds) )
{
wxLogLastError(_T("GetObject(hDIB)"));
numColors = pbmih->biClrUsed;
if ( !numColors )
{
- numColors = wxGetNumOfBitmapColors(pbmih->biBitCount);
+ numColors = GetNumberOfColours(pbmih->biBitCount);
}
break;
bi.biBitCount = bm.bmBitsPixel;
// memory we need for BITMAPINFO only
- DWORD dwLen = bi.biSize + wxGetNumOfBitmapColors(bm.bmBitsPixel) * sizeof(RGBQUAD);
+ DWORD dwLen = bi.biSize + GetNumberOfColours(bm.bmBitsPixel) * sizeof(RGBQUAD);
// get either just the image size or the image bits
if ( !::GetDIBits
return NULL;
}
- if ( !ConvertFromBitmap((BITMAPINFO *)GlobalHandle(hDIB), hbmp) )
+ if ( !ConvertFromBitmap((BITMAPINFO *)(void *)GlobalPtr(hDIB), hbmp) )
{
// this really shouldn't happen... it worked the first time, why not
// now?
return hDIB;
}
+#endif // __WXWINCE__
+
// ----------------------------------------------------------------------------
// palette support
// ----------------------------------------------------------------------------
wxCHECK_MSG( m_handle, NULL, _T("wxDIB::CreatePalette(): invalid object") );
DIBSECTION ds;
- if ( !::GetObject(m_handle, sizeof(ds), &ds) )
+ if ( !GetDIBSection(m_handle, &ds) )
{
wxLogLastError(_T("GetObject(hDIB)"));
if ( !biClrUsed )
{
// biClrUsed field might not be set
- biClrUsed = wxGetNumOfBitmapColors(ds.dsBmih.biBitCount);
+ biClrUsed = GetNumberOfColours(ds.dsBmih.biBitCount);
}
if ( !biClrUsed )
// initialize the palette header
pPalette->palVersion = 0x300; // magic number, not in docs but works
- pPalette->palNumEntries = biClrUsed;
+ pPalette->palNumEntries = (WORD)biClrUsed;
// and the colour table (it starts right after the end of the header)
const RGBQUAD *pRGB = (RGBQUAD *)((char *)&ds.dsBmih + ds.dsBmih.biSize);
// if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
// a 24bpp RGB is sufficient
- const bool hasAlpha = image.HasAlpha();
- const int bpp = hasAlpha ? 32 : 24;
+ m_hasAlpha = image.HasAlpha();
+ const int bpp = m_hasAlpha ? 32 : 24;
if ( !Create(w, h, bpp) )
return false;
const int srcBytesPerLine = w * 3;
const int dstBytesPerLine = GetLineSize(w, bpp);
const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);
- const unsigned char *alpha = hasAlpha ? image.GetAlpha() + (h - 1)*w : NULL;
+ const unsigned char *alpha = m_hasAlpha ? image.GetAlpha() + (h - 1)*w
+ : NULL;
unsigned char *dstLineStart = (unsigned char *)m_data;
for ( int y = 0; y < h; y++ )
{
// copy one DIB line
unsigned char *dst = dstLineStart;
- for ( int x = 0; x < w; x++ )
+ if ( alpha )
{
- // also, the order of RGB is inversed for DIBs
- *dst++ = src[2];
- *dst++ = src[1];
- *dst++ = src[0];
-
- src += 3;
-
- if ( alpha )
- *dst++ = *alpha++;
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed, and we need to premultiply
+ // all channels by alpha value for use with ::AlphaBlend.
+ const unsigned char a = *alpha++;
+ *dst++ = (unsigned char)((src[2] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[1] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[0] * a + 127) / 255);
+ *dst++ = a;
+ src += 3;
+ }
+ }
+ else // no alpha channel
+ {
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed.
+ *dst++ = src[2];
+ *dst++ = src[1];
+ *dst++ = src[0];
+ src += 3;
+ }
}
// pass to the previous line in the image
return true;
}
+wxImage wxDIB::ConvertToImage() const
+{
+ wxCHECK_MSG( IsOk(), wxNullImage,
+ wxT("can't convert invalid DIB to wxImage") );
+
+ // create the wxImage object
+ const int w = GetWidth();
+ const int h = GetHeight();
+ wxImage image(w, h, false /* don't bother clearing memory */);
+ if ( !image.Ok() )
+ {
+ wxFAIL_MSG( wxT("could not allocate data for image") );
+ return wxNullImage;
+ }
+
+ if ( m_hasAlpha )
+ {
+ image.SetAlpha();
+ }
+
+ // this is the same loop as in Create() just above but with copy direction
+ // reversed
+ const int bpp = GetDepth();
+ const int dstBytesPerLine = w * 3;
+ const int srcBytesPerLine = GetLineSize(w, bpp);
+ unsigned char *dst = image.GetData() + ((h - 1) * dstBytesPerLine);
+ unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() + (h - 1)*w
+ : NULL;
+ const bool is32bit = bpp == 32;
+ const unsigned char *srcLineStart = (unsigned char *)GetData();
+ for ( int y = 0; y < h; y++ )
+ {
+ // copy one DIB line
+ const unsigned char *src = srcLineStart;
+ for ( int x = 0; x < w; x++ )
+ {
+ dst[2] = *src++;
+ dst[1] = *src++;
+ dst[0] = *src++;
+
+ dst += 3;
+
+ if ( is32bit )
+ {
+ if ( alpha )
+ *alpha++ = *src;
+ src++;
+ }
+ }
+
+ // pass to the previous line in the image
+ dst -= 2*dstBytesPerLine;
+ if ( alpha )
+ alpha -= 2*w;
+
+ // and to the next one in the DIB
+ srcLineStart += srcBytesPerLine;
+ }
+
+ return image;
+}
+
#endif // wxUSE_IMAGE
+#endif // wxUSE_WXDIB
+
projects / wxWidgets.git / blobdiff