+// ----------------------------------------------------------------------------
+// monochrome bitmap functions
+// ----------------------------------------------------------------------------
+
+// this function works with destination buffer of type T and not char (where T
+// is typically wxUint32 for RGB32, wxUint16 for RGB16 &c) as we don't need
+// access to the individual pixel components -- and so it's not suitable for
+// the pixel formats with pixel size not equal to 8, 16 or 32
+template <typename T, int White, int Black>
+void
+CopyBits(int width,
+ int height,
+ const unsigned char *src,
+ const wxIDirectFBSurface::Locked locked)
+{
+ static const int BITS_PER_BYTE = 8;
+
+ // extra padding to add to dst at the end of each row: this works on the
+ // assumption that all rows are aligned at multiples of T (and usually 4
+ // bytes) boundary so check for it (and change the code if this assert is
+ // ever triggered)
+ wxASSERT_MSG( !(locked.pitch % sizeof(T)), "image rows not aligned?" );
+ const int padDst = (locked.pitch - width*sizeof(T))/sizeof(T);
+
+ int x = 0; // position in the current bitmap row
+
+ // a single char in src corresponds to 8 destination pixels and the last
+ // char in the row contains padding if necessary, i.e. there is always an
+ // integer number of chars per row
+ const unsigned char * const
+ srcEnd = src + ((width + BITS_PER_BYTE - 1)/BITS_PER_BYTE)*height;
+
+ // we operate with sizeof(T), not 1, bytes at once
+ T *dst = static_cast<T *>(locked.ptr);
+ while ( src < srcEnd )
+ {
+ unsigned char val = *src++;
+
+ for ( int bit = 0; bit < BITS_PER_BYTE; bit++ )
+ {
+ *dst++ = val & 1 ? White : Black;
+ val >>= 1;
+ if ( ++x == width )
+ {
+ dst += padDst;
+ x = 0;
+ break;
+ }
+ }
+ }
+}
+
+bool
+CopyBitsToSurface(const unsigned char *bits,
+ int width,
+ int height,
+ wxIDirectFBSurfacePtr& surface)
+{
+ wxIDirectFBSurface::Locked locked(surface, DSLF_WRITE);
+ wxCHECK_MSG( locked.ptr, false, "failed to lock surface" );
+
+ const DFBSurfacePixelFormat format = surface->GetPixelFormat();
+
+ switch ( format )
+ {
+ case DSPF_LUT8:
+ // we suppose that these indices correspond to the palette entries
+ // for white and black, respectively, but a better idea would be to
+ // use IDirectFBPalette::FindBestMatch() to determine them
+ CopyBits<wxUint8, 0xff, 0>(width, height, bits, locked);
+ break;
+
+ case DSPF_RGB16:
+ CopyBits<wxUint16, 0xffff, 0>(width, height, bits, locked);
+ break;
+
+ case DSPF_RGB32:
+ CopyBits<wxUint32, 0xffffffff, 0>(width, height, bits, locked);
+ break;
+
+ default:
+ // we don't really have time to implement efficient support for all
+ // the other formats so simply (and awfully slowly, of course...)
+ // convert everything else from RGB32
+ surface = CreateSurfaceWithFormat(width, height, DSPF_RGB32);
+ if ( !surface )
+ return false;
+
+ if ( !CopyBitsToSurface(bits, width, height, surface) )
+ return false;
+
+ if ( !ConvertSurfaceToFormat(surface, format) )
+ return false;
+ }
+
+ return true;
+}
+
+} // anonymous namespace
+
projects / wxWidgets.git / blobdiff