/* Pango * cairoview.c: Example program to view a UTF-8 encoding file * using Cairo to render result * * Copyright (C) 2005 Red Hat, Inc. * Copyright (C) 2001 Sun Microsystems * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library 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. */ #include #include #include #include #include #include #include "renderdemo.h" #include #include static Region update_region = NULL; static PangoContext *context; static Display *display; int screen; static Window window; gboolean show_borders; typedef struct { cairo_t *cr; int x_offset; int y_offset; } RenderData; static void do_cairo_render (PangoLayout *layout, int x, int y, gpointer data) { RenderData *render_data = data; cairo_t *cr = render_data->cr; cairo_move_to (cr, x, y); pango_cairo_show_layout (cr, layout); if (show_borders) { PangoRectangle ink, logical; double lw = cairo_get_line_width (cr); pango_layout_get_extents (layout, &ink, &logical); cairo_save (cr); cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.75); cairo_rectangle (cr, (double)logical.x / PANGO_SCALE - lw / 2, (double)logical.y / PANGO_SCALE - lw / 2, (double)logical.width / PANGO_SCALE + lw, (double)logical.height / PANGO_SCALE + lw); cairo_stroke (cr); cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 0.75); cairo_rectangle (cr, (double)ink.x / PANGO_SCALE - lw / 2, (double)ink.y / PANGO_SCALE - lw / 2, (double)ink.width / PANGO_SCALE + lw, (double)ink.height / PANGO_SCALE + lw); cairo_stroke (cr); cairo_restore (cr); } } static void do_cairo_transform (PangoContext *context, PangoMatrix *matrix, gpointer data) { RenderData *render_data = data; cairo_matrix_t cairo_matrix; if (matrix) { cairo_matrix.xx = matrix->xx; cairo_matrix.yx = matrix->yx; cairo_matrix.xy = matrix->xy; cairo_matrix.yy = matrix->yy; cairo_matrix.x0 = matrix->x0; cairo_matrix.y0 = matrix->y0; } else { cairo_matrix_init_identity (&cairo_matrix); } cairo_matrix_translate (&cairo_matrix, render_data->x_offset, render_data->y_offset); cairo_set_matrix (render_data->cr, &cairo_matrix); pango_context_set_matrix (context, matrix); pango_cairo_update_context (render_data->cr, context); } void update () { RenderData render_data; cairo_surface_t *surface; cairo_t *cr; Pixmap pixmap; GC gc; XRectangle extents; int width, height; /* Create a temporary pixmap and a Cairo context pointing to it */ XClipBox (update_region, &extents); width = extents.width; height = extents.height; pixmap = XCreatePixmap (display, window, width, height, DefaultDepth (display, screen)); surface = cairo_xlib_surface_create (display, pixmap, DefaultVisual (display, screen), width, height); cr = render_data.cr = cairo_create (surface); cairo_surface_destroy (surface); render_data.x_offset = - extents.x; render_data.y_offset = - extents.y; do_cairo_transform (context, NULL, &render_data); /* Clip to the current update region and fill with white */ cairo_rectangle (cr, extents.x, extents.y, extents.width, extents.height); cairo_clip (cr); cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); cairo_paint (cr); /* Draw the text in black */ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); do_output (context, do_cairo_render, do_cairo_transform, &render_data, NULL, NULL); cairo_destroy (cr); /* Copy the updated area onto the window */ gc = XCreateGC (display, pixmap, 0, NULL); XCopyArea (display, pixmap, window, gc, 0, 0, extents.width, extents.height, extents.x, extents.y); XFreeGC (display, gc); XFreePixmap (display, pixmap); XDestroyRegion (update_region); update_region = NULL; } void expose (XExposeEvent *xev) { XRectangle r; if (!update_region) update_region = XCreateRegion (); r.x = xev->x; r.y = xev->y; r.width = xev->width; r.height = xev->height; XUnionRectWithRegion (&r, update_region, update_region); } int main (int argc, char **argv) { PangoFontMap *fontmap; XEvent xev; unsigned long bg; int width, height; XSizeHints size_hints; RenderData render_data; unsigned int quit_keycode; unsigned int borders_keycode; cairo_surface_t *surface; g_type_init(); parse_options (argc, argv); display = XOpenDisplay (NULL); if (!display) fail ("Cannot open display %s\n", XDisplayName (NULL)); screen = DefaultScreen (display); fontmap = pango_cairo_font_map_get_default (); context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap)); /* This is annoying ... we have to create a temporary surface just to * get the extents of the text. */ surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1); render_data.cr = cairo_create (surface); cairo_surface_destroy (surface); render_data.x_offset = 0; render_data.y_offset = 0; do_output (context, NULL, do_cairo_transform, &render_data, &width, &height); cairo_destroy (render_data.cr); bg = WhitePixel (display, screen); window = XCreateSimpleWindow (display, DefaultRootWindow (display), 0, 0, width, height, 0, bg, bg); XSelectInput (display, window, ExposureMask | KeyPressMask); XMapWindow (display, window); XmbSetWMProperties (display, window, get_options_string (), NULL, NULL, 0, NULL, NULL, NULL); memset ((char *)&size_hints, 0, sizeof (XSizeHints)); size_hints.flags = PSize | PMaxSize; size_hints.width = width; size_hints.height = height; /* for compat only */ size_hints.max_width = width; size_hints.max_height = height; XSetWMNormalHints (display, window, &size_hints); borders_keycode = XKeysymToKeycode(display, 'B'); quit_keycode = XKeysymToKeycode(display, 'Q'); while (1) { if (!XPending (display) && update_region) update (); XNextEvent (display, &xev); switch (xev.xany.type) { case KeyPress: if (xev.xkey.keycode == quit_keycode) goto done; else if (xev.xkey.keycode == borders_keycode) { XRectangle r; show_borders = !show_borders; if (!update_region) update_region = XCreateRegion (); r.x = 0; r.y = 0; r.width = width; r.height = height; XUnionRectWithRegion (&r, update_region, update_region); } break; case Expose: expose (&xev.xexpose); break; } } done: g_object_unref (context); finalize (); return 0; }