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gtk3/gdk/win32/gdkprivate-win32.h
Tor Lillqvist 3f4c73d0d5 Bug 559408 - Transparency lost when images are copied between GTK+ and the 
2009-01-29  Tor Lillqvist  <tml@novell.com>

	Bug 559408 - Transparency lost when images are copied between GTK+
	and the clipboard on Windows

	The code in gdkselection-win32.c is simplified quite a lot. When
	an image is stored on the clipboard from GTK+, only the "PNG" and
	CF_DIB formats are advertised. PNG is our preferred format because
	it can losslessly represent any image that gdk-pixbuf can handle,
	even with alpha, unambiguously. CF_DIB is also advertised because
	of its ubiquitous support in Windows software.

	Delayed rendering is used as before, so for other data than text
	nothing is actually stored on the clipboard until some app asks
	for it.

	It's pointless to advertise images formats like "image/png" or
	"image/x-MS-bmp" that no other Windows application is going to
	look for anyway. Likewise it's pointless to store text under
	formats like "text/plain" or "UTF8_STRING". Just store
	CF_UNICODETEXT. CF_TEXT will be available as a synthesized format
	anyways.

	Office 2007 offers and asks for images in PNG format using the
	registered clipboard format name "PNG", so we do likewise. If the
	"PNG" format is available that is preferred when copying to GTK+
	from the clipboard.

	Unfortunately Word 2007 still uses CF_DIB without handling
	alpha. But PowerPoint 2007 uses PNG if available and handles alpha
	correctly. Both Word and Powerpoint offer PNG with alpha nicely.

	Firefox and IE7 offer images that contain alpha as 32-bit version
	3 BI_RGB DIBs with the undocumented "extra" bytes actually being
	alpha. Also, alpha is premultiplied into the RGB bytes, presumably
	because that is how AlphaBlend() wants such DIBs. That is also
	taken care of. At least for Firefox it easy to be sure that a
	CF_DIB on the clipboard is from Firefox.

	Also some general stylistic cleanup, comment improvements, and
	improvements of debugging printout especially in the clipboard
	handling. Those are not detailled below.

	* gdk/win32/gdkprivate-win32.h
	* gdk/win32/gdkglobals-win32.c
	* gdk/win32/gdkgmain-win32.c: Move some globals that were used
	only in gdkselection-win32.c to be local to that file.

	* gdk/win32/gdkproperty-win32.c (gdk_property_change): Don't
	bother checking if text to be placed on the clipboard consists of
	only ASCII.

	* gdk/win32/gdkselection-win32.c: Add static variables for a list
	of GdkPixbuf-supported formats, well-known registered clipboard
	formats for images, and for GdkAtoms for well-known image and text
	formats.

	(_gdk_win32_selection_init): Initialize above static variables.

	(selection_property_store) (gdk_selection_property_get)
	(_gdk_selection_property_delete): Don't use a FIFO of GdkSelProps
	for a window after all, it breaks testtext. See bug #163844.

	(gdk_selection_convert): When converting to the TARGETS format,
	i.e. when the caller wants to know what clipboard formats are
	available, if PNG is available we report just that and skip
	CF_DIB, JPEG and GIF even if advertised.

	If CF_UNICODETEXT is available, report only UTF8_STRING.

	When converting to the UTF8_STRING format, i.e. when the caller
	wants text from the clipboard, try just CF_UNICODETEXT. There is
	no point in trying CF_TEXT as Windows will synthesize
	CF_UNICODETEXT from CF_TEXT anyway, if some app has stored just
	CF_TEXT.

	When converting to the image/bmp format, i.e. when the caller
	wants an CF_DIB image from the clipboard, we check if the DIB is a
	version 3 32-bit BI_RGB one that is likely to actually contain
	alpha in the "extra" bytes. Such a DIB is likely to have
	premultiplied alpha even, at least in the case of Firefox 3 and
	IE7. We then edit the DIB in-place into a version 5 one in
	BI_BITFIELDS format and undo the alpha premultiplication.

	In any case, prepend a BMP file header before letting go of the
	data which will be fed to the gdk-pixbuf bmp loader by upper
	levels.

	(gdk_win32_selection_add_targets): If some kind of pixmap image
	format is being added, actually advertise just PNG and
	CF_DIB. Note that alpha won't be stored on the clipboard through
	CF_DIB. This is because gdk-pixbuf's bmp loader doesn't save
	alpha. Furthermore, few if any non-GTK+ Windows apps seem to
	understand a version 5 DIB with proper alpha anyway.

	(_gdk_win32_selection_convert_to_dib): Simplified muchly.



svn path=/trunk/; revision=22255
2009-01-30 01:16:47 +00:00

466 lines
14 KiB
C
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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __GDK_PRIVATE_WIN32_H__
#define __GDK_PRIVATE_WIN32_H__
#ifndef WINVER
#define WINVER 0x0500
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT WINVER
#endif
#include <gdk/gdkprivate.h>
#include <gdk/win32/gdkwindow-win32.h>
#include <gdk/win32/gdkpixmap-win32.h>
#include "gdkinternals.h"
#include "config.h"
/* Make up for some minor w32api or MSVC6 header lossage */
#ifndef PS_JOIN_MASK
#define PS_JOIN_MASK (PS_JOIN_BEVEL|PS_JOIN_MITER|PS_JOIN_ROUND)
#endif
#ifndef FS_VIETNAMESE
#define FS_VIETNAMESE 0x100
#endif
#ifndef WM_GETOBJECT
#define WM_GETOBJECT 0x3D
#endif
#ifndef WM_NCXBUTTONDOWN
#define WM_NCXBUTTONDOWN 0xAB
#endif
#ifndef WM_NCXBUTTONUP
#define WM_NCXBUTTONUP 0xAC
#endif
#ifndef WM_NCXBUTTONDBLCLK
#define WM_NCXBUTTONDBLCLK 0xAD
#endif
#ifndef WM_CHANGEUISTATE
#define WM_CHANGEUISTATE 0x127
#endif
#ifndef WM_UPDATEUISTATE
#define WM_UPDATEUISTATE 0x128
#endif
#ifndef WM_QUERYUISTATE
#define WM_QUERYUISTATE 0x129
#endif
#ifndef WM_XBUTTONDOWN
#define WM_XBUTTONDOWN 0x20B
#endif
#ifndef WM_XBUTTONUP
#define WM_XBUTTONUP 0x20C
#endif
#ifndef WM_XBUTTONDBLCLK
#define WM_XBUTTONDBLCLK 0x20D
#endif
#ifndef WM_NCMOUSEHOVER
#define WM_NCMOUSEHOVER 0x2A0
#endif
#ifndef WM_NCMOUSELEAVE
#define WM_NCMOUSELEAVE 0x2A2
#endif
#ifndef WM_APPCOMMAND
#define WM_APPCOMMAND 0x319
#endif
#ifndef CF_DIBV5
#define CF_DIBV5 17
#endif
/* Define some combinations of GdkDebugFlags */
#define GDK_DEBUG_EVENTS_OR_COLORMAP (GDK_DEBUG_EVENTS|GDK_DEBUG_COLORMAP)
#define GDK_DEBUG_EVENTS_OR_INPUT (GDK_DEBUG_EVENTS|GDK_DEBUG_INPUT)
#define GDK_DEBUG_PIXMAP_OR_COLORMAP (GDK_DEBUG_PIXMAP|GDK_DEBUG_COLORMAP)
#define GDK_DEBUG_MISC_OR_COLORMAP (GDK_DEBUG_MISC|GDK_DEBUG_COLORMAP)
#define GDK_DEBUG_MISC_OR_EVENTS (GDK_DEBUG_MISC|GDK_DEBUG_EVENTS)
#define GDK_TYPE_GC_WIN32 (_gdk_gc_win32_get_type ())
#define GDK_GC_WIN32(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_GC_WIN32, GdkGCWin32))
#define GDK_GC_WIN32_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_GC_WIN32, GdkGCWin32Class))
#define GDK_IS_GC_WIN32(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_GC_WIN32))
#define GDK_IS_GC_WIN32_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_GC_WIN32))
#define GDK_GC_WIN32_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_GC_WIN32, GdkGCWin32Class))
typedef struct _GdkColormapPrivateWin32 GdkColormapPrivateWin32;
typedef struct _GdkCursorPrivate GdkCursorPrivate;
typedef struct _GdkWin32SingleFont GdkWin32SingleFont;
typedef struct _GdkFontPrivateWin32 GdkFontPrivateWin32;
typedef struct _GdkGCWin32 GdkGCWin32;
typedef struct _GdkGCWin32Class GdkGCWin32Class;
struct _GdkCursorPrivate
{
GdkCursor cursor;
HCURSOR hcursor;
};
struct _GdkWin32SingleFont
{
HFONT hfont;
UINT charset;
UINT codepage;
FONTSIGNATURE fs;
};
struct _GdkFontPrivateWin32
{
GdkFontPrivate base;
GSList *fonts; /* List of GdkWin32SingleFonts */
GSList *names;
};
struct _GdkVisualClass
{
GObjectClass parent_class;
};
typedef enum {
GDK_WIN32_PE_STATIC,
GDK_WIN32_PE_AVAILABLE,
GDK_WIN32_PE_INUSE
} GdkWin32PalEntryState;
struct _GdkColormapPrivateWin32
{
HPALETTE hpal;
gint current_size; /* Current size of hpal */
GdkWin32PalEntryState *use;
gint private_val;
GHashTable *hash;
GdkColorInfo *info;
};
struct _GdkGCWin32
{
GdkGC parent_instance;
/* A Windows Device Context (DC) is not equivalent to an X11
* GC. We can use a DC only in the window for which it was
* allocated, or (in the case of a memory DC) with the bitmap that
* has been selected into it. Thus, we have to release and
* reallocate a DC each time the GdkGC is used to paint into a new
* window or pixmap. We thus keep all the necessary values in the
* GdkGCWin32 object.
*/
HRGN hcliprgn;
GdkGCValuesMask values_mask;
GdkFont *font;
gint rop2;
GdkSubwindowMode subwindow_mode;
gint graphics_exposures;
gint pen_width;
DWORD pen_style;
GdkLineStyle line_style;
GdkCapStyle cap_style;
GdkJoinStyle join_style;
DWORD *pen_dashes; /* use for PS_USERSTYLE or step-by-step rendering */
gint pen_num_dashes;
gint pen_dash_offset;
HBRUSH pen_hbrbg;
/* Following fields are valid while the GC exists as a Windows DC */
HDC hdc;
int saved_dc;
HPALETTE holdpal;
};
struct _GdkGCWin32Class
{
GdkGCClass parent_class;
};
GType _gdk_gc_win32_get_type (void);
gulong _gdk_win32_get_next_tick (gulong suggested_tick);
void _gdk_window_init_position (GdkWindow *window);
void _gdk_window_move_resize_child (GdkWindow *window,
gint x,
gint y,
gint width,
gint height);
/* GdkWindowImpl methods */
void _gdk_win32_window_scroll (GdkWindow *window,
gint dx,
gint dy);
void _gdk_win32_window_move_region (GdkWindow *window,
const GdkRegion *region,
gint dx,
gint dy);
void _gdk_win32_windowing_window_get_offsets (GdkWindow *window,
gint *x_offset,
gint *y_offset);
void _gdk_window_process_expose (GdkWindow *window,
GdkRegion *invalidate_region);
void _gdk_win32_selection_init (void);
void _gdk_win32_dnd_exit (void);
void gdk_win32_handle_table_insert (HANDLE *handle,
gpointer data);
void gdk_win32_handle_table_remove (HANDLE handle);
GdkGC *_gdk_win32_gc_new (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask values_mask);
GdkImage *_gdk_win32_get_image (GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height);
GdkImage *_gdk_win32_copy_to_image (GdkDrawable *drawable,
GdkImage *image,
gint src_x,
gint src_y,
gint dest_x,
gint dest_y,
gint width,
gint height);
void _gdk_win32_blit (gboolean use_fg_bg,
GdkDrawableImplWin32 *drawable,
GdkGC *gc,
GdkDrawable *src,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height);
COLORREF _gdk_win32_colormap_color (GdkColormap *colormap,
gulong pixel);
HRGN _gdk_win32_bitmap_to_hrgn (GdkPixmap *bitmap);
HRGN _gdk_win32_gdkregion_to_hrgn (const GdkRegion *region,
gint x_origin,
gint y_origin);
GdkRegion *_gdk_win32_hrgn_to_region (HRGN hrgn);
void _gdk_win32_adjust_client_rect (GdkWindow *window,
RECT *RECT);
void _gdk_selection_property_delete (GdkWindow *);
void _gdk_dropfiles_store (gchar *data);
void _gdk_wchar_text_handle (GdkFont *font,
const wchar_t *wcstr,
int wclen,
void (*handler)(GdkWin32SingleFont *,
const wchar_t *,
int,
void *),
void *arg);
void _gdk_push_modal_window (GdkWindow *window);
void _gdk_remove_modal_window (GdkWindow *window);
GdkWindow *_gdk_modal_current ();
#ifdef G_ENABLE_DEBUG
gchar *_gdk_win32_color_to_string (const GdkColor *color);
void _gdk_win32_print_paletteentries (const PALETTEENTRY *pep,
const int nentries);
void _gdk_win32_print_system_palette (void);
void _gdk_win32_print_hpalette (HPALETTE hpal);
void _gdk_win32_print_dc (HDC hdc);
gchar *_gdk_win32_cap_style_to_string (GdkCapStyle cap_style);
gchar *_gdk_win32_fill_style_to_string (GdkFill fill);
gchar *_gdk_win32_function_to_string (GdkFunction function);
gchar *_gdk_win32_join_style_to_string (GdkJoinStyle join_style);
gchar *_gdk_win32_line_style_to_string (GdkLineStyle line_style);
gchar *_gdk_win32_gcvalues_mask_to_string (GdkGCValuesMask mask);
gchar *_gdk_win32_window_state_to_string (GdkWindowState state);
gchar *_gdk_win32_window_style_to_string (LONG style);
gchar *_gdk_win32_window_exstyle_to_string (LONG style);
gchar *_gdk_win32_window_pos_bits_to_string (UINT flags);
gchar *_gdk_win32_drawable_description (GdkDrawable *d);
gchar *_gdk_win32_rop2_to_string (int rop2);
gchar *_gdk_win32_lbstyle_to_string (UINT brush_style);
gchar *_gdk_win32_pstype_to_string (DWORD pen_style);
gchar *_gdk_win32_psstyle_to_string (DWORD pen_style);
gchar *_gdk_win32_psendcap_to_string (DWORD pen_style);
gchar *_gdk_win32_psjoin_to_string (DWORD pen_style);
gchar *_gdk_win32_message_to_string (UINT msg);
gchar *_gdk_win32_key_to_string (LONG lParam);
gchar *_gdk_win32_cf_to_string (UINT format);
gchar *_gdk_win32_data_to_string (const guchar*data,
int nbytes);
gchar *_gdk_win32_rect_to_string (const RECT *rect);
gchar *_gdk_win32_gdkrectangle_to_string (const GdkRectangle *rect);
gchar *_gdk_win32_gdkregion_to_string (const GdkRegion *box);
#endif
gchar *_gdk_win32_last_error_string (void);
void _gdk_win32_api_failed (const gchar *where,
gint line,
const gchar *api);
void _gdk_other_api_failed (const gchar *where,
gint line,
const gchar *api);
#if defined(__GNUC__) && (__GNUC__ < 3)
#define WIN32_API_FAILED(api) _gdk_win32_api_failed (__FILE__ ":" __PRETTY_FUNCTION__, __LINE__, api)
#define WIN32_GDI_FAILED(api) WIN32_API_FAILED (api)
#define OTHER_API_FAILED(api) _gdk_other_api_failed (__FILE__ ":" __PRETTY_FUNCTION__, __LINE__, api)
#else
#define WIN32_API_FAILED(api) _gdk_win32_api_failed (__FILE__, __LINE__, api)
#define WIN32_GDI_FAILED(api) WIN32_API_FAILED (api)
#define OTHER_API_FAILED(api) _gdk_other_api_failed (__FILE__, __LINE__, api)
#endif
/* These two macros call a GDI or other Win32 API and if the return
* value is zero or NULL, print a warning message. The majority of GDI
* calls return zero or NULL on failure. The value of the macros is nonzero
* if the call succeeded, zero otherwise.
*/
#define GDI_CALL(api, arglist) (api arglist ? 1 : (WIN32_GDI_FAILED (#api), 0))
#define API_CALL(api, arglist) (api arglist ? 1 : (WIN32_API_FAILED (#api), 0))
extern LRESULT CALLBACK _gdk_win32_window_procedure (HWND, UINT, WPARAM, LPARAM);
extern GdkWindow *_gdk_root;
extern GdkDisplay *_gdk_display;
extern GdkScreen *_gdk_screen;
extern gint _gdk_num_monitors;
typedef struct _GdkWin32Monitor GdkWin32Monitor;
struct _GdkWin32Monitor
{
gchar *name;
gint width_mm, height_mm;
GdkRectangle rect;
};
extern GdkWin32Monitor *_gdk_monitors;
/* Offsets to add to Windows coordinates (which are relative to the
* primary monitor's origin, and thus might be negative for monitors
* to the left and/or above the primary monitor) to get GDK
* coordinates, which should be non-negative on the whole screen.
*/
extern gint _gdk_offset_x, _gdk_offset_y;
extern HDC _gdk_display_hdc;
extern HINSTANCE _gdk_dll_hinstance;
extern HINSTANCE _gdk_app_hmodule;
/* These are thread specific, but GDK/win32 works OK only when invoked
* from a single thread anyway.
*/
extern HKL _gdk_input_locale;
extern gboolean _gdk_input_locale_is_ime;
extern UINT _gdk_input_codepage;
extern guint _gdk_keymap_serial;
extern gboolean _gdk_keyboard_has_altgr;
extern guint _scancode_rshift;
/* GdkAtoms: properties, targets and types */
extern GdkAtom _gdk_selection;
extern GdkAtom _wm_transient_for;
extern GdkAtom _targets;
extern GdkAtom _save_targets;
extern GdkAtom _utf8_string;
extern GdkAtom _text;
extern GdkAtom _compound_text;
extern GdkAtom _text_uri_list;
/* DND selections */
extern GdkAtom _local_dnd;
extern GdkAtom _gdk_win32_dropfiles;
extern GdkAtom _gdk_ole2_dnd;
/* Options */
extern gboolean _gdk_input_ignore_wintab;
extern gint _gdk_max_colors;
#define GDK_WIN32_COLORMAP_DATA(cmap) ((GdkColormapPrivateWin32 *) GDK_COLORMAP (cmap)->windowing_data)
/* TRUE while a user-initiated window move or resize operation is in progress */
extern gboolean _sizemove_in_progress;
/* TRUE when we are emptying the clipboard ourselves */
extern gboolean _ignore_destroy_clipboard;
/* Mapping from registered clipboard format id (native) to
* corresponding GdkAtom
*/
extern GHashTable *_format_atom_table;
/* Hold the result of a delayed rendering */
extern HGLOBAL _delayed_rendering_data;
HGLOBAL _gdk_win32_selection_convert_to_dib (HGLOBAL hdata,
GdkAtom target);
/* Convert a pixbuf to an HICON (or HCURSOR). Supports alpha under
* Windows XP, thresholds alpha otherwise.
*/
HICON _gdk_win32_pixbuf_to_hicon (GdkPixbuf *pixbuf);
HICON _gdk_win32_pixbuf_to_hcursor (GdkPixbuf *pixbuf,
gint x_hotspot,
gint y_hotspot);
gboolean _gdk_win32_pixbuf_to_hicon_supports_alpha (void);
/* Initialization */
void _gdk_windowing_window_init (void);
void _gdk_root_window_size_init (void);
void _gdk_monitor_init(void);
void _gdk_visual_init (void);
void _gdk_dnd_init (void);
void _gdk_windowing_image_init (void);
void _gdk_events_init (void);
void _gdk_input_init (GdkDisplay *display);
#endif /* __GDK_PRIVATE_WIN32_H__ */
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