+
+bool wxBMPHandler::SaveFile(wxImage *image,
+ wxOutputStream& stream,
+ bool verbose)
+{
+ wxCHECK_MSG( image, FALSE, _T("invalid pointer in wxBMPHandler::SaveFile") );
+
+ if (!image->Ok())
+ {
+ if (verbose) wxLogError(_("BMP: Couldn't save invalid image."));
+ return FALSE;
+ }
+
+ unsigned width = image->GetWidth();
+ unsigned row_width = width * 3 +
+ (((width % 4) == 0) ? 0 : (4 - (width * 3) % 4));
+ // each row must be aligned to dwords
+ struct
+ {
+ // BitmapHeader:
+ wxUint16 magic; // format magic, always 'BM'
+ wxUint32 filesize; // total file size, inc. headers
+ wxUint32 reserved; // for future use
+ wxUint32 data_offset; // image data offset in the file
+
+ // BitmapInfoHeader:
+ wxUint32 bih_size; // 2nd part's size
+ wxUint32 width, height; // bitmap's dimensions
+ wxUint16 planes; // num of planes
+ wxUint16 bpp; // bits per pixel
+ wxUint32 compression; // compression method
+ wxUint32 size_of_bmp; // size of the bitmap
+ wxUint32 h_res, v_res; // image resolution in dpi
+ wxUint32 num_clrs; // number of colors used
+ wxUint32 num_signif_clrs;// number of significant colors
+ } hdr;
+ wxUint32 hdr_size = 14/*BitmapHeader*/ + 40/*BitmapInfoHeader*/;
+
+ hdr.magic = wxUINT16_SWAP_ON_BE(0x4D42/*'BM'*/);
+ hdr.filesize = wxUINT32_SWAP_ON_BE(
+ hdr_size +
+ row_width * image->GetHeight()
+ );
+ hdr.reserved = 0;
+ hdr.data_offset = wxUINT32_SWAP_ON_BE(hdr_size);
+
+ hdr.bih_size = wxUINT32_SWAP_ON_BE(hdr_size - 14);
+ hdr.width = wxUINT32_SWAP_ON_BE(image->GetWidth());
+ hdr.height = wxUINT32_SWAP_ON_BE(image->GetHeight());
+ hdr.planes = wxUINT16_SWAP_ON_BE(1); // always 1 plane
+ hdr.bpp = wxUINT16_SWAP_ON_BE(24); // always TrueColor
+ hdr.compression = 0; // RGB uncompressed
+ hdr.size_of_bmp = wxUINT32_SWAP_ON_BE(row_width * image->GetHeight());
+ hdr.h_res = hdr.v_res = wxUINT32_SWAP_ON_BE(72); // 72dpi is standard
+ hdr.num_clrs = 0; // maximal possible = 2^24
+ hdr.num_signif_clrs = 0; // all colors are significant
+
+ if (// VS: looks ugly but compilers tend to do ugly things with structs,
+ // like aligning hdr.filesize's ofset to dword :(
+ // VZ: we should add padding then...
+ !stream.Write(&hdr.magic, 2) ||
+ !stream.Write(&hdr.filesize, 4) ||
+ !stream.Write(&hdr.reserved, 4) ||
+ !stream.Write(&hdr.data_offset, 4) ||
+ !stream.Write(&hdr.bih_size, 4) ||
+ !stream.Write(&hdr.width, 4) ||
+ !stream.Write(&hdr.height, 4) ||
+ !stream.Write(&hdr.planes, 2) ||
+ !stream.Write(&hdr.bpp, 2) ||
+ !stream.Write(&hdr.compression, 4) ||
+ !stream.Write(&hdr.size_of_bmp, 4) ||
+ !stream.Write(&hdr.h_res, 4) ||
+ !stream.Write(&hdr.v_res, 4) ||
+ !stream.Write(&hdr.num_clrs, 4) ||
+ !stream.Write(&hdr.num_signif_clrs, 4)
+ )
+ {
+ if (verbose)
+ wxLogError(_("BMP: Couldn't write the file header."));
+ return FALSE;
+ }
+
+ wxUint8 *data = (wxUint8*) image->GetData();
+ wxUint8 *buffer = new wxUint8[row_width];
+ wxUint8 tmpvar;
+ memset(buffer, 0, row_width);
+ int y; unsigned x;
+
+ for (y = image->GetHeight() -1 ; y >= 0; y--)
+ {
+ memcpy(buffer, data + y * 3 * width, 3 * width);
+ for (x = 0; x < width; x++)
+ {
+ tmpvar = buffer[3 * x + 0];
+ buffer[3 * x + 0] = buffer[3 * x + 2];
+ buffer[3 * x + 2] = tmpvar;
+ }
+
+ if (!stream.Write(buffer, row_width))
+ {
+ if (verbose)
+ wxLogError(_("BMP: Couldn't write data."));
+ delete[] buffer;
+ return FALSE;
+ }
+ }
+ delete[] buffer;
+
+ return TRUE;
+}
+
+
+
+
projects / wxWidgets.git / blobdiff