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Diffstat (limited to 'src/Xdbe.c')
| -rw-r--r-- | src/Xdbe.c | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/src/Xdbe.c b/src/Xdbe.c new file mode 100644 index 0000000..a08aab9 --- /dev/null +++ b/src/Xdbe.c @@ -0,0 +1,542 @@ +/* $Xorg: Xdbe.c,v 1.4 2000/08/17 19:45:53 cpqbld Exp $ */ +/****************************************************************************** + * + * Copyright (c) 1994, 1995 Hewlett-Packard Company + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL HEWLETT-PACKARD COMPANY BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR + * THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of the Hewlett-Packard + * Company shall not be used in advertising or otherwise to promote the + * sale, use or other dealings in this Software without prior written + * authorization from the Hewlett-Packard Company. + * + * Xlib DBE code + * + *****************************************************************************/ + + +#define NEED_EVENTS +#define NEED_REPLIES +#include <X11/Xlibint.h> +#include "Xext.h" +#include "extutil.h" +#define NEED_DBE_PROTOCOL +#include "Xdbe.h" + +static XExtensionInfo _dbe_info_data; +static XExtensionInfo *dbe_info = &_dbe_info_data; +static char *dbe_extension_name = DBE_PROTOCOL_NAME; + +#define DbeCheckExtension(dpy,i,val) \ + XextCheckExtension (dpy, i, dbe_extension_name, val) +#define DbeSimpleCheckExtension(dpy,i) \ + XextSimpleCheckExtension (dpy, i, dbe_extension_name) + +#if defined(__STDC__) && !defined(UNIXCPP) +#define DbeGetReq(name,req,info) GetReq (name, req); \ + req->reqType = info->codes->major_opcode; \ + req->dbeReqType = X_##name; +#else +#define DbeGetReq(name,req,info) GetReq (name, req); \ + req->reqType = info->codes->major_opcode; \ + req->dbeReqType = X_/**/name; +#endif + + +/***************************************************************************** + * * + * private utility routines * + * * + *****************************************************************************/ + +/* + * find_display - locate the display info block + */ +static int close_display(); +static char *error_string(); +static XExtensionHooks dbe_extension_hooks = { + NULL, /* create_gc */ + NULL, /* copy_gc */ + NULL, /* flush_gc */ + NULL, /* free_gc */ + NULL, /* create_font */ + NULL, /* free_font */ + close_display, /* close_display */ + NULL, /* wire_to_event */ + NULL, /* event_to_wire */ + NULL, /* error */ + error_string, /* error_string */ +}; + +static char *dbe_error_list[] = { + "BadBuffer", /* DbeBadBuffer */ +}; + +static XEXT_GENERATE_FIND_DISPLAY (find_display, dbe_info, + dbe_extension_name, + &dbe_extension_hooks, + DbeNumberEvents, NULL) + +static XEXT_GENERATE_CLOSE_DISPLAY (close_display, dbe_info) + +static XEXT_GENERATE_ERROR_STRING (error_string, dbe_extension_name, + DbeNumberErrors, + dbe_error_list) + + +/***************************************************************************** + * * + * Double-Buffering public interfaces * + * * + *****************************************************************************/ + +/* + * XdbeQueryExtension - + * Sets major_version_return and minor_verion_return to the major and + * minor DBE protocol version supported by the server. If the DBE + * library is compatible with the version returned by the server, this + * function returns non-zero. If dpy does not support the DBE + * extension, or if there was an error during communication with the + * server, or if the server and library protocol versions are + * incompatible, this functions returns zero. No other Xdbe functions + * may be called before this function. If a client violates this rule, + * the effects of all subsequent Xdbe calls are undefined. + */ +#if NeedFunctionPrototypes +Status XdbeQueryExtension ( + Display *dpy, + int *major_version_return, + int *minor_version_return) +#else +Status XdbeQueryExtension (dpy, major_version_return, minor_version_return) + Display *dpy; + int *major_version_return; + int *minor_version_return; +#endif +{ + XExtDisplayInfo *info = find_display (dpy); + xDbeGetVersionReply rep; + register xDbeGetVersionReq *req; + + if (!XextHasExtension (info)) + return (Status)0; /* failure */ + + LockDisplay (dpy); + DbeGetReq (DbeGetVersion, req, info); + req->majorVersion = DBE_MAJOR_VERSION; + req->minorVersion = DBE_MINOR_VERSION; + + if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) { + UnlockDisplay (dpy); + SyncHandle (); + return (Status)0; /* failure */ + } + *major_version_return = rep.majorVersion; + *minor_version_return = rep.minorVersion; + UnlockDisplay (dpy); + + SyncHandle (); + + if (*major_version_return != DBE_MAJOR_VERSION) + return (Status)0; /* failure */ + else + return (Status)1; /* success */ +} + + +/* + * XdbeAllocateBackBuffer - + * This function returns a drawable ID used to refer to the back buffer + * of the specified window. The swap_action is a hint to indicate the + * swap action that will likely be used in subsequent calls to + * XdbeSwapBuffers. The actual swap action used in calls to + * XdbeSwapBuffers does not have to be the same as the swap_action + * passed to this function, though clients are encouraged to provide + * accurate information whenever possible. + */ + +/*## If NeedFunctionPrototypes is defined, the swap_action parameter causes + *## compiler failure without the #ifdef workaround below. With + *## NeedFunctionPrototype enabled, this function is prototyped as + *## + *## XdbeBackBuffer XdbeAllocateBackBufferName (dpy, window, swap_action) + *## Display *dpy; + *## Window window; + *## XdbeSwapAction swap_action; + *## + *## Without the workaround, an error occurs because swap_action is promoted to + *## an int by the compiler when compiling this file. However, this type does + *## not match what is in the function prototype in Xdbe.h. In Xdbe.h, the + *## swap_action parameter is defined as an unsigned char, not an int. + *##*/ + +#if NeedFunctionPrototypes +XdbeBackBuffer XdbeAllocateBackBufferName( + Display *dpy, + Window window, + XdbeSwapAction swap_action) +#else +XdbeBackBuffer XdbeAllocateBackBufferName (dpy, window, swap_action) + Display *dpy; + Window window; + XdbeSwapAction swap_action; +#endif +{ + XExtDisplayInfo *info = find_display (dpy); + register xDbeAllocateBackBufferNameReq *req; + XdbeBackBuffer buffer; + + /* make sure extension is available; if not, return the + * third parameter (0). + */ + DbeCheckExtension (dpy, info, (XdbeBackBuffer)0); + + /* allocate the id */ + buffer = XAllocID (dpy); + + LockDisplay(dpy); + DbeGetReq(DbeAllocateBackBufferName, req, info); + req->window = window; + req->swapAction = (unsigned char)swap_action; + req->buffer = buffer; + + UnlockDisplay (dpy); + SyncHandle (); + return buffer; + +} /* XdbeAllocateBackBufferName() */ + +/* + * XdbeDeallocateBackBufferName - + * This function frees a drawable ID, buffer, that was obtained via + * XdbeAllocateBackBufferName. The buffer must refer to the back buffer + * of the specified window, or a protocol error results. + */ +#if NeedFunctionPrototypes +Status XdbeDeallocateBackBufferName ( + Display *dpy, + XdbeBackBuffer buffer) +#else +Status XdbeDeallocateBackBufferName (dpy, buffer) + Display *dpy; + XdbeBackBuffer buffer; +#endif +{ + XExtDisplayInfo *info = find_display (dpy); + register xDbeDeallocateBackBufferNameReq *req; + + DbeCheckExtension (dpy, info, (Status)0 /* failure */); + + LockDisplay (dpy); + DbeGetReq (DbeDeallocateBackBufferName, req, info); + req->buffer = buffer; + UnlockDisplay (dpy); + SyncHandle (); + + return (Status)1; /* success */ +} + + +/* + * XdbeSwapBuffers - + * This function swaps the front and back buffers for a list of windows. + * The argument num_windows specifies how many windows are to have their + * buffers swapped; it is the number of elements in the swap_info array. + * The argument swap_info specifies the information needed per window + * to do the swap. + */ +#if NeedFunctionPrototypes +Status XdbeSwapBuffers ( + Display *dpy, + XdbeSwapInfo *swap_info, + int num_windows) +#else +Status XdbeSwapBuffers (dpy, swap_info, num_windows) + Display *dpy; + XdbeSwapInfo *swap_info; + int num_windows; +#endif +{ + XExtDisplayInfo *info = find_display (dpy); + register xDbeSwapBuffersReq *req; + int i; + + DbeCheckExtension (dpy, info, (Status)0 /* failure */); + + LockDisplay (dpy); + DbeGetReq (DbeSwapBuffers, req, info); + req->length += 2*num_windows; + req->n = num_windows; + + /* We need to handle 64-bit machines, where we can not use PackData32 + * directly because info would be lost in translating from 32- to 64-bit. + * Instead we send data via a loop that accounts for the translation. + */ + for (i = 0; i < num_windows; i++) + { + char tmp[4]; + Data32 (dpy, (long *)&swap_info[i].swap_window, 4); + tmp[0] = swap_info[i].swap_action; + Data (dpy, (char *)tmp, 4); + } + + UnlockDisplay (dpy); + SyncHandle (); + + + return (Status)1; /* success */ + +} /* XdbeSwapBuffers() */ + + +/* + * XdbeBeginIdiom - + * This function marks the beginning of an idiom sequence. + */ +#if NeedFunctionPrototypes +Status XdbeBeginIdiom ( + Display *dpy) +#else +Status XdbeBeginIdiom (dpy) + Display *dpy; +#endif +{ + XExtDisplayInfo *info = find_display(dpy); + register xDbeBeginIdiomReq *req; + + DbeCheckExtension (dpy, info, (Status)0 /* failure */); + + LockDisplay (dpy); + DbeGetReq (DbeBeginIdiom, req, info); + UnlockDisplay (dpy); + SyncHandle (); + + return (Status)1; /* success */ +} + + +/* + * XdbeEndIdiom - + * This function marks the end of an idiom sequence. + */ +#if NeedFunctionPrototypes +Status XdbeEndIdiom ( + Display *dpy) +#else +Status XdbeEndIdiom (dpy) + Display *dpy; +#endif +{ + XExtDisplayInfo *info = find_display(dpy); + register xDbeEndIdiomReq *req; + + DbeCheckExtension (dpy, info, (Status)0 /* failure */); + + LockDisplay (dpy); + DbeGetReq (DbeEndIdiom, req, info); + UnlockDisplay (dpy); + SyncHandle (); + + return (Status)1; /* success */ +} + + +/* + * XdbeGetVisualInfo - + * This function returns information about which visuals support + * double buffering. The argument num_screens specifies how many + * elements there are in the screen_specifiers list. Each drawable + * in screen_specifiers designates a screen for which the supported + * visuals are being requested. If num_screens is zero, information + * for all screens is requested. In this case, upon return from this + * function, num_screens will be set to the number of screens that were + * found. If an error occurs, this function returns NULL, else it returns + * a pointer to a list of XdbeScreenVisualInfo structures of length + * num_screens. The nth element in the returned list corresponds to the + * nth drawable in the screen_specifiers list, unless num_screens was + * passed in with the value zero, in which case the nth element in the + * returned list corresponds to the nth screen of the server, starting + * with screen zero. + */ +#if NeedFunctionPrototypes +XdbeScreenVisualInfo *XdbeGetVisualInfo ( + Display *dpy, + Drawable *screen_specifiers, + int *num_screens) /* SEND and RETURN */ +#else +XdbeScreenVisualInfo *XdbeGetVisualInfo (dpy, screen_specifiers, num_screens) + Display *dpy; + Drawable *screen_specifiers; + int *num_screens; /* SEND and RETURN */ +#endif +{ + XExtDisplayInfo *info = find_display(dpy); + register xDbeGetVisualInfoReq *req; + xDbeGetVisualInfoReply rep; + XdbeScreenVisualInfo *scrVisInfo; + int i; + + DbeCheckExtension (dpy, info, (XdbeScreenVisualInfo *)NULL); + + LockDisplay (dpy); + + DbeGetReq(DbeGetVisualInfo, req, info); + req->length = 2 + *num_screens; + req->n = *num_screens; + Data32 (dpy, screen_specifiers, (*num_screens * sizeof (CARD32))); + + if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) { + UnlockDisplay (dpy); + SyncHandle (); + return NULL; + } + + /* return the number of screens actually found if we + * requested information about all screens (*num_screens == 0) + */ + if (*num_screens == 0) + *num_screens = rep.m; + + /* allocate list of visual information to be returned */ + if (!(scrVisInfo = + (XdbeScreenVisualInfo *)Xmalloc( + (unsigned)(*num_screens * sizeof(XdbeScreenVisualInfo))))) { + UnlockDisplay (dpy); + SyncHandle (); + return NULL; + } + + for (i = 0; i < *num_screens; i++) + { + int nbytes; + int j; + long c; + + _XRead32 (dpy, (char *)&c, sizeof(CARD32)); + scrVisInfo[i].count = c; + + nbytes = scrVisInfo[i].count * sizeof(XdbeVisualInfo); + + /* if we can not allocate the list of visual/depth info + * then free the lists that we already allocate as well + * as the visual info list itself + */ + if (!(scrVisInfo[i].visinfo = (XdbeVisualInfo *)Xmalloc( + (unsigned)nbytes))) { + for (j = 0; j < i; j++) { + Xfree ((char *)scrVisInfo[j].visinfo); + } + Xfree ((char *)scrVisInfo); + UnlockDisplay (dpy); + SyncHandle (); + return NULL; + } + + /* Read the visual info item into the wire structure. Then copy each + * element into the library structure. The element sizes and/or + * padding may be different in the two structures. + */ + for (j = 0; j < scrVisInfo[i].count; j++) { + xDbeVisInfo xvi; + + _XRead (dpy, (char *)&xvi, sizeof(xDbeVisInfo)); + scrVisInfo[i].visinfo[j].visual = xvi.visualID; + scrVisInfo[i].visinfo[j].depth = xvi.depth; + scrVisInfo[i].visinfo[j].perflevel = xvi.perfLevel; + } + + } + + UnlockDisplay (dpy); + SyncHandle (); + return scrVisInfo; + +} /* XdbeGetVisualInfo() */ + + +/* + * XdbeFreeVisualInfo - + * This function frees the list of XdbeScreenVisualInfo returned by the + * function XdbeGetVisualInfo. + */ +#if NeedFunctionPrototypes +void XdbeFreeVisualInfo( + XdbeScreenVisualInfo *visual_info) +#else +void XdbeFreeVisualInfo(visual_info) + XdbeScreenVisualInfo *visual_info; +#endif +{ + if (visual_info == NULL) { + return; + } + + if (visual_info->visinfo) { + XFree(visual_info->visinfo); + } + + XFree(visual_info); +} + + +/* + * XdbeGetBackBufferAttributes - + * This function returns the attributes associated with the specified + * buffer. + */ +#if NeedFunctionPrototypes +XdbeBackBufferAttributes *XdbeGetBackBufferAttributes( + Display *dpy, + XdbeBackBuffer buffer) +#else +XdbeBackBufferAttributes *XdbeGetBackBufferAttributes(dpy, buffer) + Display *dpy; + XdbeBackBuffer buffer; +#endif +{ + XExtDisplayInfo *info = find_display(dpy); + register xDbeGetBackBufferAttributesReq *req; + xDbeGetBackBufferAttributesReply rep; + XdbeBackBufferAttributes *attr; + + DbeCheckExtension(dpy, info, (XdbeBackBufferAttributes *)NULL); + + if (!(attr = + (XdbeBackBufferAttributes *)Xmalloc(sizeof(XdbeBackBufferAttributes)))) { + return NULL; + } + + LockDisplay(dpy); + DbeGetReq(DbeGetBackBufferAttributes, req, info); + req->buffer = buffer; + + if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) { + UnlockDisplay (dpy); + SyncHandle (); + return NULL; + } + attr->window = rep.attributes; + + UnlockDisplay (dpy); + SyncHandle (); + + return attr; +} + |