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Diffstat (limited to 'src/StdCmap.c')
| -rw-r--r-- | src/StdCmap.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/StdCmap.c b/src/StdCmap.c new file mode 100644 index 0000000..60719e8 --- /dev/null +++ b/src/StdCmap.c @@ -0,0 +1,218 @@ +/* $Xorg: StdCmap.c,v 1.4 2001/02/09 02:03:53 xorgcvs Exp $ */ + +/* + +Copyright 1989, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +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 THE +OPEN GROUP 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 Open Group 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 Open Group. + +*/ + +/* + * Author: Donna Converse, MIT X Consortium + */ + +#include <stdio.h> +#include <X11/Xlib.h> +#include <X11/Xatom.h> +#include <X11/Xutil.h> +#include <X11/Xmu/StdCmap.h> + +#define lowbit(x) ((x) & (~(x) + 1)) + +static Status valid_args(); /* argument restrictions */ + +/* + * To create any one standard colormap, use XmuStandardColormap(). + * + * Create a standard colormap for the given screen, visualid, and visual + * depth, with the given red, green, and blue maximum values, with the + * given standard property name. Return a pointer to an XStandardColormap + * structure which describes the newly created colormap, upon success. + * Upon failure, return NULL. + * + * XmuStandardColormap() calls XmuCreateColormap() to create the map. + * + * Resources created by this function are not made permanent; that is the + * caller's responsibility. + */ + +XStandardColormap *XmuStandardColormap(dpy, screen, visualid, depth, property, + cmap, red_max, green_max, blue_max) + Display *dpy; /* specifies X server connection */ + int screen; /* specifies display screen */ + VisualID visualid; /* identifies the visual type */ + unsigned int depth; /* identifies the visual type */ + Atom property; /* a standard colormap property */ + Colormap cmap; /* specifies colormap ID or None */ + unsigned long red_max, green_max, blue_max; /* allocations */ +{ + XStandardColormap *stdcmap; + Status status; + XVisualInfo vinfo_template, *vinfo; + long vinfo_mask; + int n; + + /* Match the required visual information to an actual visual */ + vinfo_template.visualid = visualid; + vinfo_template.screen = screen; + vinfo_template.depth = depth; + vinfo_mask = VisualIDMask | VisualScreenMask | VisualDepthMask; + if ((vinfo = XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &n)) == NULL) + return 0; + + /* Check the validity of the combination of visual characteristics, + * allocation, and colormap property. Create an XStandardColormap + * structure. + */ + + if (! valid_args(vinfo, red_max, green_max, blue_max, property) + || ((stdcmap = XAllocStandardColormap()) == NULL)) { + XFree((char *) vinfo); + return 0; + } + + /* Fill in the XStandardColormap structure */ + + if (cmap == DefaultColormap(dpy, screen)) { + /* Allocating out of the default map, cannot use XFreeColormap() */ + Window win = XCreateWindow(dpy, RootWindow(dpy, screen), 1, 1, 1, 1, + 0, 0, InputOnly, vinfo->visual, + (unsigned long) 0, + (XSetWindowAttributes *)NULL); + stdcmap->killid = (XID) XCreatePixmap(dpy, win, 1, 1, depth); + XDestroyWindow(dpy, win); + stdcmap->colormap = cmap; + } else { + stdcmap->killid = ReleaseByFreeingColormap; + stdcmap->colormap = XCreateColormap(dpy, RootWindow(dpy, screen), + vinfo->visual, AllocNone); + } + stdcmap->red_max = red_max; + stdcmap->green_max = green_max; + stdcmap->blue_max = blue_max; + if (property == XA_RGB_GRAY_MAP) + stdcmap->red_mult = stdcmap->green_mult = stdcmap->blue_mult = 1; + else if (vinfo->class == TrueColor || vinfo->class == DirectColor) { + stdcmap->red_mult = lowbit(vinfo->red_mask); + stdcmap->green_mult = lowbit(vinfo->green_mask); + stdcmap->blue_mult = lowbit(vinfo->blue_mask); + } else { + stdcmap->red_mult = (red_max > 0) + ? (green_max + 1) * (blue_max + 1) : 0; + stdcmap->green_mult = (green_max > 0) ? blue_max + 1 : 0; + stdcmap->blue_mult = (blue_max > 0) ? 1 : 0; + } + stdcmap->base_pixel = 0; /* base pixel may change */ + stdcmap->visualid = vinfo->visualid; + + /* Make the colormap */ + + status = XmuCreateColormap(dpy, stdcmap); + + /* Clean up */ + + XFree((char *) vinfo); + if (!status) { + + /* Free the colormap or the pixmap, if we created one */ + if (stdcmap->killid == ReleaseByFreeingColormap) + XFreeColormap(dpy, stdcmap->colormap); + else if (stdcmap->killid != None) + XFreePixmap(dpy, stdcmap->killid); + + XFree((char *) stdcmap); + return (XStandardColormap *) NULL; + } + return stdcmap; +} + +/****************************************************************************/ +static Status valid_args(vinfo, red_max, green_max, blue_max, property) + XVisualInfo *vinfo; /* specifies visual */ + unsigned long red_max, green_max, blue_max; /* specifies alloc */ + Atom property; /* specifies property name */ +{ + unsigned long ncolors; /* number of colors requested */ + + /* Determine that the number of colors requested is <= map size */ + + if ((vinfo->class == DirectColor) || (vinfo->class == TrueColor)) { + unsigned long mask; + + mask = vinfo->red_mask; + while (!(mask & 1)) + mask >>= 1; + if (red_max > mask) + return 0; + mask = vinfo->green_mask; + while (!(mask & 1)) + mask >>= 1; + if (green_max > mask) + return 0; + mask = vinfo->blue_mask; + while (!(mask & 1)) + mask >>= 1; + if (blue_max > mask) + return 0; + } else if (property == XA_RGB_GRAY_MAP) { + ncolors = red_max + green_max + blue_max + 1; + if (ncolors > vinfo->colormap_size) + return 0; + } else { + ncolors = (red_max + 1) * (green_max + 1) * (blue_max + 1); + if (ncolors > vinfo->colormap_size) + return 0; + } + + /* Determine that the allocation and visual make sense for the property */ + + switch (property) + { + case XA_RGB_DEFAULT_MAP: + if (red_max == 0 || green_max == 0 || blue_max == 0) + return 0; + break; + case XA_RGB_RED_MAP: + if (red_max == 0) + return 0; + break; + case XA_RGB_GREEN_MAP: + if (green_max == 0) + return 0; + break; + case XA_RGB_BLUE_MAP: + if (blue_max == 0) + return 0; + break; + case XA_RGB_BEST_MAP: + if (red_max == 0 || green_max == 0 || blue_max == 0) + return 0; + break; + case XA_RGB_GRAY_MAP: + if (red_max == 0 || blue_max == 0 || green_max == 0) + return 0; + break; + default: + return 0; + } + return 1; +} |