Author: manolo
Date: 2010-03-07 05:30:40 -0800 (Sun, 07 Mar 2010)
New Revision: 7227
Log:
Added comments describing pixmap printing algorithm for MSWindows GDI printers.
Modified:
branches/branch-1.3-Fl_Printer/src/Fl_Pixmap.cxx
Modified: branches/branch-1.3-Fl_Printer/src/Fl_Pixmap.cxx
===================================================================
--- branches/branch-1.3-Fl_Printer/src/Fl_Pixmap.cxx 2010-03-06 15:22:22 UTC
(rev 7226)
+++ branches/branch-1.3-Fl_Printer/src/Fl_Pixmap.cxx 2010-03-07 13:30:40 UTC
(rev 7227)
@@ -145,27 +145,45 @@
}
#elif defined(WIN32)
if (fl_device->type() == Fl_Device::gdi_printer) {
+ typedef BOOL (WINAPI* fl_transp_func)
(HDC,int,int,int,int,HDC,int,int,int,int,UINT);
static HMODULE hMod = NULL;
- if (!hMod) hMod = LoadLibrary("MSIMG32.DLL");
+ static fl_transp_func fl_TransparentBlt = NULL;
+ if (!hMod) {
+ hMod = LoadLibrary("MSIMG32.DLL");
+ if(hMod) fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod,
"TransparentBlt");
+ }
if (hMod) {
-# define UNLIKELY_RGB_COLOR 2,3,4
+# define UNLIKELY_RGB_COLOR 2,3,4 // a nearly black color unlikely to
occur in pixmaps
# define WIN_COLOR RGB(2,3,4)
- typedef BOOL (WINAPI* fl_transp_func)
(HDC,int,int,int,int,HDC,int,int,int,int,UINT);
Fl_Offscreen tmp_id = fl_create_offscreen(w(), h());
fl_begin_offscreen(tmp_id);
uchar *bitmap = 0;
fl_mask_bitmap = &bitmap;
- Fl_Color save_c = fl_color();
- fl_color(UNLIKELY_RGB_COLOR);
- fl_draw_pixmap(data(), 0, 0, fl_color() );
- fl_color( save_c );
+ // draw pixmap to offscreen using the unlikely color for background
+ fl_draw_pixmap(data(), 0, 0, fl_rgb_color(UNLIKELY_RGB_COLOR) );
fl_end_offscreen();
HDC new_gc = CreateCompatibleDC(fl_gc);
int save = SaveDC(new_gc);
SelectObject(new_gc, (void*)tmp_id);
- fl_transp_func fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod,
"TransparentBlt");
- fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(),
WIN_COLOR);
+ // print all of offscreen but its parts using unlikely color
+ fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(), WIN_COLOR
);
RestoreDC(new_gc,save);
+ // This is an approximate algorithm that fails to print pixmap pixels
that would use the unlikely color.
+ // It can be transformed into an exact algorithm by adding the following
commented out statements
+ // that print pixmap one more time hiding another color (any color would
fit)
+ /*
+# define UNLIKELY_RGB_COLOR2 4,3,2
+# define WIN_COLOR2 RGB(4,3,2)
+ {
+ fl_begin_offscreen(tmp_id);
+ fl_draw_pixmap(data(), 0, 0, fl_rgb_color(UNLIKELY_RGB_COLOR2) );
+ fl_end_offscreen();
+ }
+ save = SaveDC(new_gc);
+ SelectObject(new_gc, (void*)tmp_id);
+ fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, w(), h(),
WIN_COLOR2 );
+ RestoreDC(new_gc,save);
+ */
DeleteDC(new_gc);
fl_delete_offscreen(tmp_id);
}
_______________________________________________
fltk-commit mailing list
[email protected]
http://lists.easysw.com/mailman/listinfo/fltk-commit
