| 1 | /* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved. |
| 2 | Distributed by Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of Ghostscript. |
| 5 | |
| 6 | Ghostscript is distributed in the hope that it will be useful, but |
| 7 | WITHOUT ANY WARRANTY. No author or distributor accepts responsibility |
| 8 | to anyone for the consequences of using it or for whether it serves any |
| 9 | particular purpose or works at all, unless he says so in writing. Refer |
| 10 | to the Ghostscript General Public License for full details. |
| 11 | |
| 12 | Everyone is granted permission to copy, modify and redistribute |
| 13 | Ghostscript, but only under the conditions described in the Ghostscript |
| 14 | General Public License. A copy of this license is supposed to have been |
| 15 | given to you along with Ghostscript so you can know your rights and |
| 16 | responsibilities. It should be in a file named COPYING. Among other |
| 17 | things, the copyright notice and this notice must be preserved on all |
| 18 | copies. */ |
| 19 | |
| 20 | /* gdevx.h */ |
| 21 | /* Header file with X device structure */ |
| 22 | /* Requires gxdevice.h and x_.h */ |
| 23 | |
| 24 | /* Define the type of an X pixel. */ |
| 25 | typedef unsigned long x_pixel; |
| 26 | |
| 27 | /* |
| 28 | * We have two alternatives in mapping between X pixel values and |
| 29 | * Ghostscript gx_color_index values. If we make them the same, |
| 30 | * Ghostscript will get confused if there is an X pixel value |
| 31 | * corresponding to gx_no_color_index. If we make them different, |
| 32 | * we have to keep some kind of map, with all the associated bookkeeping. |
| 33 | * |
| 34 | * We opt for the first solution. When we open the device, |
| 35 | * we check whether black or white maps to gx_no_color_index. |
| 36 | * (Since gx_no_color_index is all 1's, we assume no other color |
| 37 | * could have this pixel value.) If this is the case, we xor all |
| 38 | * pixel values with a value chosen so that no pixel value will map |
| 39 | * to gx_no_color_index. |
| 40 | */ |
| 41 | #define pixel_to_color_index(px) ((px) ^ xdev->pixel_fix) |
| 42 | #define color_index_to_pixel(ci) ((ci) ^ xdev->pixel_fix) |
| 43 | |
| 44 | /* Define a rectangle structure for update bookkeeping */ |
| 45 | typedef struct rect_s { |
| 46 | int xo, yo, xe, ye; |
| 47 | } rect; |
| 48 | |
| 49 | /* Define the X Windows device */ |
| 50 | typedef struct gx_device_X_s { |
| 51 | gx_device_common; |
| 52 | |
| 53 | /* An XImage object for writing bitmap images to the screen */ |
| 54 | XImage image; |
| 55 | |
| 56 | /* Global X state */ |
| 57 | Display *dpy; |
| 58 | Screen *scr; |
| 59 | XVisualInfo *vinfo; |
| 60 | Colormap cmap; |
| 61 | Window win; |
| 62 | GC gc; |
| 63 | |
| 64 | /* A backing pixmap so X will handle exposure automatically */ |
| 65 | Pixmap bpixmap; /* 0 if use_backing is false, */ |
| 66 | /* or if it can't be allocated */ |
| 67 | int ghostview; /* flag to tell if ghostview is in control */ |
| 68 | Window mwin; /* window to receive ghostview messages */ |
| 69 | /* Don't include standard colormap stuff for X11R3 and earlier */ |
| 70 | #if HaveStdCMap |
| 71 | XStandardColormap *std_cmap; /* standard color map if available */ |
| 72 | #endif |
| 73 | gs_matrix initial_matrix; /* the initial transformation */ |
| 74 | Atom next, page, done; /* Atoms used to talk to ghostview */ |
| 75 | rect update; /* region needing updating */ |
| 76 | long up_area; /* total area of update */ |
| 77 | /* (always 0 if no backing pixmap) */ |
| 78 | int up_count; /* # of updates since flush */ |
| 79 | Pixmap dest; /* bpixmap if non-0, else win */ |
| 80 | x_pixel colors_or; /* 'or' of all device colors used so far */ |
| 81 | x_pixel colors_and; /* 'and' ditto */ |
| 82 | |
| 83 | /* An intermediate pixmap for the stencil case of copy_mono */ |
| 84 | struct { |
| 85 | Pixmap pixmap; |
| 86 | GC gc; |
| 87 | int raster, height; |
| 88 | } cp; |
| 89 | |
| 90 | /* Structure for dealing with the halftone tile. */ |
| 91 | /* Later this might become a multi-element cache. */ |
| 92 | struct { |
| 93 | Pixmap pixmap; |
| 94 | Pixmap no_pixmap; /* kludge to get around X bug */ |
| 95 | gx_bitmap_id id; |
| 96 | int width, height, raster; |
| 97 | x_pixel fore_c, back_c; |
| 98 | } ht; |
| 99 | |
| 100 | /* Cache the function and fill style from the GC */ |
| 101 | int function; |
| 102 | int fill_style; |
| 103 | |
| 104 | #define set_fill_style(style)\ |
| 105 | if ( xdev->fill_style != style )\ |
| 106 | XSetFillStyle(xdev->dpy, xdev->gc, (xdev->fill_style = style)) |
| 107 | #define set_function(func)\ |
| 108 | if ( xdev->function != func )\ |
| 109 | XSetFunction(xdev->dpy, xdev->gc, (xdev->function = func)) |
| 110 | |
| 111 | /* Map color indices to X pixel values */ |
| 112 | unsigned long pixel_fix; |
| 113 | x_pixel colors[8]; /* primary colors */ |
| 114 | #define pixel_black xdev->colors[0] |
| 115 | #define pixel_white xdev->colors[7] |
| 116 | x_pixel back_color, fore_color; |
| 117 | |
| 118 | #define note_color(pixel)\ |
| 119 | xdev->colors_or |= pixel,\ |
| 120 | xdev->colors_and &= pixel |
| 121 | #define set_back_color(pixel)\ |
| 122 | if ( xdev->back_color != pixel )\ |
| 123 | { xdev->back_color = pixel;\ |
| 124 | note_color(pixel);\ |
| 125 | XSetBackground(xdev->dpy, xdev->gc, pixel);\ |
| 126 | } |
| 127 | #define set_fore_color(pixel)\ |
| 128 | if ( xdev->fore_color != pixel )\ |
| 129 | { xdev->fore_color = pixel;\ |
| 130 | note_color(pixel);\ |
| 131 | XSetForeground(xdev->dpy, xdev->gc, pixel);\ |
| 132 | } |
| 133 | |
| 134 | } gx_device_X; |
| 135 | |
| 136 | /* Default window size */ |
| 137 | #define DEFAULT_WIDTH_INCHES 8.5 |
| 138 | #define DEFAULT_HEIGHT_INCHES 11 |
| 139 | |
| 140 | /* Define a fake value for X and Y resolution, */ |
| 141 | /* so an uninitialized value can be detected easily. */ |
| 142 | #define FAKE_RES 2 /* easily detected fake value */ |