path: root/decorate-render.c

/*
 * decorate-render.c
 *
 * Part of gwm, the Gratuitous Window Manager,
 *     by Gary Wong, <gtw@gnu.org>.
 *
 * Copyright (C) 2009  Gary Wong
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of version 3 of the GNU General Public License as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * $Id$
 */

#include <config.h>

#include <assert.h>
#include <fontconfig/fontconfig.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_CACHE_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xcb/render.h>
#include <xcb/xcb.h>

#include "gwm.h"

#include "decorate-render.h"

/* FIXME make this configurable */
#define FONT_SIZE 12
#define STRING2(x) #x
#define STRING(x) STRING2(x)
#define FONT_SIZE_STRING STRING( FONT_SIZE )
#define FONT_NAME "sans:pixelsize=" FONT_SIZE_STRING ":bold"

static FT_Library ftl;
static FT_Face ftf; /* FIXME allow multiple faces per fontconfig pattern */

static const uint16_t decoration_cols[ NUM_COLS ][ 3 ] = {
    { 0x2222, 0x3333, 0xEEEE }, /* COL_FRAME_ACTIVE */
    { 0xAAAA, 0xAAAA, 0xAAAA }, /* COL_FRAME_INACTIVE */
    { 0x0000, 0x0000, 0x0000 }, /* COL_BORDER */
    { 0xFFFF, 0x0000, 0x0000 }, /* COL_BUTTON_ACTIVE */
    { 0xCCCC, 0xCCCC, 0xCCCC }, /* COL_BUTTON_INACTIVE */
    { 0xFFFF, 0xFFFF, 0xFFFF }, /* COL_TITLE_ACTIVE */
    { 0x3333, 0x3333, 0x3333 }, /* COL_TITLE_INACTIVE */
    { 0xFFFF, 0xFFFF, 0xFFFF }, /* COL_FEEDBACK_BACK */
    { 0x0000, 0x0000, 0x0000 }  /* COL_FEEDBACK_FORE */
};

#define METRIC_CACHE_SIZE_BITS 14
#define METRIC_CACHE_SIZE ( 1 << METRIC_CACHE_SIZE_BITS )
#define METRIC_CACHE_ASSOC_BITS 2
#define METRIC_CACHE_ASSOC ( 1 << METRIC_CACHE_ASSOC_BITS )

#define GLYPH_CACHE_SIZE_BITS 11
#define GLYPH_CACHE_SIZE ( 1 << GLYPH_CACHE_SIZE_BITS )
#define GLYPH_CACHE_ASSOC_BITS 3
#define GLYPH_CACHE_ASSOC ( 1 << GLYPH_CACHE_ASSOC_BITS )

#if GLYPH_CACHE_SIZE_BITS + GLYPH_CACHE_ASSOC_BITS > 16
#error "Glyph cache is too big for 16-bit indices."
#endif

static struct metric_cache_line {
    uint32_t c; /* character code */
    unsigned int time;
    int x_off, y_off;
} metric_cache[ METRIC_CACHE_SIZE ][ METRIC_CACHE_ASSOC ];

static struct glyph_cache_line {
    uint32_t c; /* character code */
    unsigned int time;
} glyph_cache[ GLYPH_CACHE_SIZE ][ GLYPH_CACHE_ASSOC ];

static unsigned int current_time;

static void query_metrics( uint32_t c, int *x_off, int *y_off ) {

    int row = c & ( METRIC_CACHE_SIZE - 1 );
    int i, max;

    for( i = 0; i < METRIC_CACHE_ASSOC; i++ )
	if( metric_cache[ row ][ i ].c == c ) {
	    /* Cache hit. */
	    metric_cache[ row ][ i ].time = current_time;
	    *x_off = metric_cache[ row ][ i ].x_off;
	    *y_off = metric_cache[ row ][ i ].y_off;
	    return;
	}

    /* Cache miss. */
    if( FT_Load_Char( ftf, c, FT_LOAD_DEFAULT ) ) {
	/* Couldn't load metrics.  Don't bother evicting anything. */
	*x_off = *y_off = 0;
	return;
    }

    /* Search for a line to evict. */
    for( i = 1, max = 0; i < METRIC_CACHE_ASSOC; i++ )
	if( current_time - metric_cache[ row ][ i ].time >
	    current_time - metric_cache[ row ][ max ].time )
	    max = i;

    metric_cache[ row ][ max ].c = c;
    metric_cache[ row ][ max ].time = current_time;
    *x_off = metric_cache[ row ][ max ].x_off =
	( ftf->glyph->advance.x + 0x20 ) >> 6;
    *y_off = metric_cache[ row ][ max ].y_off =
	( ftf->glyph->advance.y + 0x20 ) >> 6;
}

static int query_glyph( uint32_t c ) {
    
    int row = c & ( GLYPH_CACHE_SIZE - 1 );
    int i;

    for( i = 0; i < GLYPH_CACHE_ASSOC; i++ )
	if( glyph_cache[ row ][ i ].c == c ) {
	    /* Cache hit. */
	    glyph_cache[ row ][ i ].time = current_time;
	    return ( row << GLYPH_CACHE_ASSOC_BITS ) | i;
	}

    return -1;
}

static int replace_glyph( uint32_t c ) {

    int row = c & ( GLYPH_CACHE_SIZE - 1 );
    int i, max;

    /* Search for a line to evict. */
    for( i = 1, max = 0; i < METRIC_CACHE_ASSOC; i++ ) {
	assert( glyph_cache[ row ][ i ].c != c );
	if( current_time - glyph_cache[ row ][ i ].time >
	    current_time - glyph_cache[ row ][ max ].time )
	    max = i;
    }

    if( glyph_cache[ row ][ max ].time == current_time )
	/* Cache line set is full, and nothing is old enough to evict. */
	return -1;
    
    glyph_cache[ row ][ max ].c = c;
    glyph_cache[ row ][ max ].time = current_time;

    return ( row << GLYPH_CACHE_ASSOC_BITS ) | max;
}

static xcb_render_glyphset_t glyphset;
static struct picture {
    xcb_render_picture_t pic;
    enum decoration_col col;
} *pictures; /* indexed by screen */

static xcb_void_cookie_t render_text( xcb_drawable_t drawable, int screen, 
				      int col, int x, int y,
				      const char *text,
				      const xcb_rectangle_t *clip ) {

    xcb_render_picture_t src, dest;
    xcb_rectangle_t rect;
    xcb_render_color_t rc;
    int i, len;
    const unsigned char *p;
    uint32_t *buf;
    
    if( !text || !*text ) {
	xcb_void_cookie_t r = { 0 };

	return r;
    }

    len = 0;
    p = (const unsigned char *) text;
    for(;;)
	if( !p[ 0 ] )
	    /* End of string. */
	    break;
	else if( !( p[ 0 ] & 0x80 ) ) {
	    /* Legal single byte character. */
	    len++;
	    p++;
	} else if( *p >= 0xC2 && *p <= 0xDF &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF ) {
	    /* Legal two byte character. */
	    len++;
	    p += 2;
	} else if( *p >= 0xE0 && *p <= 0xEF &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF &&
		   p[ 2 ] >= 0x80 && p[ 2 ] <= 0xBF &&
		   ( *p > 0xE0 || p[ 1 ] > 0x80 ) ) {
	    /* Legal three byte character. */
	    len++;
	    p += 3;
	} else if( *p >= 0xF0 && *p <= 0xF4 &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF &&
		   p[ 2 ] >= 0x80 && p[ 2 ] <= 0xBF &&
		   p[ 3 ] >= 0x80 && p[ 3 ] <= 0xBF &&
		   ( *p > 0xF0 || p[ 1 ] > 0x80 ) ) {
	    /* Legal four byte character. */
	    len++;
	    p += 4;
	} else
	    /* Illegal character: ignore this byte and continue. */
	    p++;

    if( !len ) {
	xcb_void_cookie_t r = { 0 };

	return r;
    }
    
    buf = alloca( len * sizeof *buf );

    for( p = (const unsigned char *) text, i = 0; i < len; i++ ) {
    retry:
	assert( *p );

	if( !( p[ 0 ] & 0x80 ) )
	    /* One byte character. */
	    buf[ i ] = *p++;
	else if( *p >= 0xC2 && *p <= 0xDF &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF ) {
	    /* Two byte character. */
	    buf[ i ] = ( ( p[ 0 ] & 0x1F ) << 6 ) | ( p[ 1 ] & 0x3F );
	    p += 2;
	} else if( *p >= 0xE0 && *p <= 0xEF &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF &&
		   p[ 2 ] >= 0x80 && p[ 2 ] <= 0xBF &&
		   ( *p > 0xE0 || p[ 1 ] > 0x80 ) ) {
	    /* Three byte character. */
	    buf[ i ] = ( ( p[ 0 ] & 0x0F ) << 12 ) |
		( ( p[ 1 ] & 0x3F ) << 6 ) | ( p[ 2 ] & 0x3F );
	    p += 3;
	} else if( *p >= 0xF0 && *p <= 0xF4 &&
		   p[ 1 ] >= 0x80 && p[ 1 ] <= 0xBF &&
		   p[ 2 ] >= 0x80 && p[ 2 ] <= 0xBF &&
		   p[ 3 ] >= 0x80 && p[ 3 ] <= 0xBF &&
		   ( *p > 0xF0 || p[ 1 ] > 0x80 ) ) {
	    /* Four byte character. */
	    buf[ i ] = ( ( p[ 0 ] & 0x07 ) << 18 ) |
		( ( p[ 1 ] & 0x3F ) << 12 ) | ( ( p[ 2 ] & 0x3F ) << 6 ) |
		( p[ 3 ] & 0x3F );
	    p += 4;
	} else {
	    p++;
	    goto retry;
	}
    }

    src = pictures[ screen ].pic;
    
    dest = xcb_generate_id( c );
    xcb_render_create_picture( c, dest, drawable,
			       gwm_screens[ screen ].root_pictformat, 0, NULL );

    if( clip )
	xcb_render_set_picture_clip_rectangles( c, dest, 0, 0, 1, clip );

    if( pictures[ screen ].col != col ) {
	rc.red = decoration_cols[ col ][ 0 ];
	rc.green = decoration_cols[ col ][ 1 ];
	rc.blue = decoration_cols[ col ][ 2 ];
	rc.alpha = 0xFFFF;
	rect.x = 0;
	rect.y = 0;
	rect.width = 1;
	rect.height = 1;
	xcb_render_fill_rectangles( c, XCB_RENDER_PICT_OP_SRC, src, rc, 1,
				    &rect );

	pictures[ screen ].col = col;
    }
    
    i = 0;
    while( i < len ) {
	uint32_t glyphids[ 0x80 ];
	xcb_render_glyphinfo_t glyphs[ 0x80 ];
	int num_glyphs; /* number of glyphs in AddGlyphs request */
	/* Buffer for "data" parameter of AddGlyphs request.  We want
	   this to be big enough to hold at least one glyph, but no
	   bigger than the biggest request the server will accept (once
	   the other parameters are included).  All servers must
	   accept requests of 16,384 bytes or smaller (see X Window
	   System Protocol, section 8), so this is safe. */
	uint8_t data[ 0x2000 ], *p;
	/* Buffer for "glyphcmds" parameter of CompositeGlyphs16
	   request.  We always send exactly one command, which has an
	   8-byte header and at most a 254 glyph string. */
	uint8_t param[ 8 + ( 0xFE << 1 ) ], *out;
	int num_chars; /* number of characters for CompositeGlyphs16 */
	
	current_time++;

	p = data;
	num_glyphs = 0;

	memset( param, 0, 4 );
	*( (uint16_t *) ( param + 4 ) ) = x;
	*( (uint16_t *) ( param + 6 ) ) = y;	
	out = param + 8;
	num_chars = 0;
	
	while( i < len && num_chars < 0xFF ) {
	    int dx, dy, index;
	    
	    if( ( index = query_glyph( buf[ i ] ) ) < 0 ) {
		/* Cache miss. */
		int bitmap_size;
		FT_GlyphSlot slot;
		
		if( ( index = replace_glyph( buf[ i ] ) ) < 0 )
		    /* Cache set full: spill the partial string to make
		       room for later glyphs. */
		    break;

		if( FT_Load_Char( ftf, buf[ i ], FT_LOAD_RENDER ) ||
		    ( bitmap_size = ( ( ftf->glyph->bitmap.width + 3 ) & ~3 ) *
		      ftf->glyph->bitmap.rows ) > sizeof data ) {
		    /* We couldn't load the character, or it was so
		       huge that it won't fit in an empty AddGlyph
		       data buffer.  We'll have to send the server
		       an empty glyph and carry on. */
		    slot = NULL;
		    bitmap_size = 0;
		} else
		    slot = ftf->glyph;
		
		if( ( p - data ) + bitmap_size > sizeof data ||
		    num_glyphs == sizeof glyphids / sizeof *glyphids ) {
		    /* Can't fit this glyph into the existing request:
		       transmit what we have... */
		    xcb_render_add_glyphs( c, glyphset, num_glyphs, glyphids,
					   glyphs, p - data, data );

		    /* ...and start building another AddGlyph request. */
		    p = data;
		    num_glyphs = 0;
		}

		glyphids[ num_glyphs ] = index;

		if( slot ) {
		    int y, width_pad;
		    
		    glyphs[ num_glyphs ].width = slot->bitmap.width;
		    glyphs[ num_glyphs ].height = slot->bitmap.rows;
		    glyphs[ num_glyphs ].x = -slot->bitmap_left;
		    glyphs[ num_glyphs ].y = slot->bitmap_top;
		    glyphs[ num_glyphs ].x_off =
			( slot->advance.x + 0x20 ) >> 6;
		    glyphs[ num_glyphs ].y_off =
			( slot->advance.y + 0x20 ) >> 6;

		    width_pad = ( slot->bitmap.width + 3 ) & ~3;
		    
		    for( y = 0; y < slot->bitmap.rows; y++ ) {
			memcpy( p, slot->bitmap.buffer + y *
				slot->bitmap.width, slot->bitmap.width );
			p += width_pad;
		    }
		} else {
		    glyphs[ num_glyphs ].width = 0;
		    glyphs[ num_glyphs ].height = 0;
		    glyphs[ num_glyphs ].x = 0;
		    glyphs[ num_glyphs ].y = 0;
		    glyphs[ num_glyphs ].x_off = 0;
		    glyphs[ num_glyphs ].y_off = 0;
		}

		num_glyphs++;
	    }

	    *( (uint16_t *) out ) = index;
	    out += 2;

	    query_metrics( buf[ i ], &dx, &dy );
	    x += dx;
	    y += dy;

	    num_chars++;
	    i++;
	}

	if( num_glyphs ) {
	    xcb_render_add_glyphs( c, glyphset, num_glyphs, glyphids, glyphs,
				   p - data, data );

	    p = data;
	    num_glyphs = 0;
	}
	
	param[ 0 ] = num_chars;

	xcb_render_composite_glyphs_16( c, XCB_RENDER_PICT_OP_OVER, src, dest,
					XCB_NONE, glyphset, 0, 0, out - param,
					param );
    }

    return xcb_render_free_picture( c, dest );
}

extern void render_update_window( struct gwm_window *window ) {

    if( !window->cleared )
	xcb_clear_area( c, FALSE, window->w, window->update.x, window->update.y,
			window->update.width, window->update.height );

    if( window->type == WINDOW_FRAME ) {
	char *name = window->u.frame.child->u.managed.name;

	render_text( window->w, window->screen, window == focus_frame ?
		     COL_TITLE_ACTIVE : COL_TITLE_INACTIVE,
		     FRAME_BUTTON_SIZE + FRAME_BORDER_WIDTH * 3,
		     FONT_SIZE, name ? name : "(Untitled)",
		     &window->update );
    } else if( window->type == WINDOW_FEEDBACK ) {
	char *p, text[ 32 ];
	int width;
	
	sprintf( text, "%dx%d", window->u.feedback.fb_width,
		 window->u.feedback.fb_height );

	for( width = 0, p = text; *p; p++ ) {
	    int dx, dy;

	    query_metrics( *p, &dx, &dy );
	    width += dx;
	}

	render_text( window->w, window->screen, COL_FEEDBACK_FORE,
		     ( FEEDBACK_WIDTH - width ) >> 1, 16, text,
		     &window->update );
    }
}

static uint16_t luma( int col ) {

    return ( decoration_cols[ col ][ 0 ] * 0x4C8BU +
	     decoration_cols[ col ][ 1 ] * 0x9646U +
	     decoration_cols[ col ][ 2 ] * 0x1D2FU ) >> 16;
}

static void handle_alloc_color( unsigned int sequence, void *reply,
				xcb_generic_error_t *error,
				union callback_param p ) {
    
    xcb_alloc_color_reply_t *r = reply;
    int screen = p.l >> 16, col = p.l & 0xFFFF;
    
    if( error ) {
	if( error->error_code != XCB_ALLOC )
	    show_error( error );
	
	/* No standard RGB map available, and we couldn't allocate a shared
	   colour.  Fall back to black or white. */
	gwm_screens[ screen ].pixels[ col ] = luma( col ) >= 0x8000 ?
	    screens[ screen ]->white_pixel : screens[ screen ]->black_pixel;

	free( error );
    }

    if( reply ) {
	gwm_screens[ screen ].pixels[ col ] = r->pixel;

	free( reply );
    }
}

static void handle_get_default_map( unsigned int sequence, void *reply,
				    xcb_generic_error_t *error,
				    union callback_param p ) {

    int col, got_cols = FALSE;
    
    if( error ) {
	show_error( error );

	free( error );
    }

    if( reply ) {
	xcb_get_property_reply_t *prop = reply;    
	struct std_cmap {
	    /* RGB_COLOR_MAP property -- see ICCCM 2.0, section 6.4. */
	    xcb_colormap_t colormap;
	    uint32_t red_max, red_mult, green_max, green_mult, blue_max,
		blue_mult, base_pixel;
	    xcb_visualid_t visual_id;
	    uint32_t kill_id;
	} *std_cmaps = xcb_get_property_value( prop );
	int num_cmaps = ( xcb_get_property_value_length( prop ) << 2 ) /
	    sizeof *std_cmaps;
	int i;

	if( prop->format == 32 )
	    for( i = 0; i < num_cmaps; i++ )
		if( std_cmaps[ i ].visual_id ==
		    gwm_screens[ p.l ].root_visual->visual_id ) {
		    
		    for( col = 0; col < NUM_COLS; col++ ) {
			int r0, g0, b0, r, g, b;

			if( gwm_screens[ p.l ].root_visual->_class ==
			    XCB_VISUAL_CLASS_STATIC_GRAY ||
			    gwm_screens[ p.l ].root_visual->_class ==
			    XCB_VISUAL_CLASS_GRAY_SCALE ) {
			    r0 = luma( col );
			    g0 = b0 = 0;
			} else {
			    r0 = decoration_cols[ col ][ 0 ];
			    g0 = decoration_cols[ col ][ 1 ];
			    b0 = decoration_cols[ col ][ 2 ];
			}

			r = ( r0 * std_cmaps[ i ].red_max + 0x8000 ) >> 16;
			g = ( g0 * std_cmaps[ i ].green_max + 0x8000 ) >> 16;
			b = ( b0 * std_cmaps[ i ].blue_max + 0x8000 ) >> 16;

			gwm_screens[ p.l ].pixels[ col ] =
			    std_cmaps[ i ].base_pixel +
			    r * std_cmaps[ i ].red_mult +
			    g * std_cmaps[ i ].green_mult +
			    b * std_cmaps[ i ].blue_mult;
		    }

		    got_cols = TRUE;
		    break;
		}

	free( reply );
    }

    if( !got_cols )
	/* No useful default maps found; try allocating directly. */
	for( col = 0; col < NUM_COLS; col++ ) {
	    int r, g, b;
	    union callback_param cp;
	    
	    if( gwm_screens[ p.l ].root_visual->_class ==
		XCB_VISUAL_CLASS_STATIC_GRAY ||
		gwm_screens[ p.l ].root_visual->_class ==
		XCB_VISUAL_CLASS_GRAY_SCALE )
		r = g = b = luma( col );
	    else {
		r = decoration_cols[ col ][ 0 ];
		g = decoration_cols[ col ][ 1 ];
		b = decoration_cols[ col ][ 2 ];
	    }
	    
	    cp.l = ( p.l << 16 ) | col;
	    /* Ideally, we would like a guarantee that this operation will
	       complete before the pixel values are ever looked up.  In
	       practice, it will, and it is too messy to insert a
	       sync_with_callback() before every single pixel reference. */
	    handle_async_reply( xcb_alloc_color(
				    c, screens[ p.l ]->default_colormap,
				    r, g, b ).sequence, handle_alloc_color,
				cp );
	}
}

static void decorate_compat_init( void ) {

    int i;
    const char *cursor_font_name = "cursor";
    xcb_font_t cursor_font;
    static const int cursor_glyphs[ NUM_CURSORS ] = {
	68, /* CURSOR_ARROW */
	88, /* CURSOR_DESTROY */
	134, /* CURSOR_TL */
	138, /* CURSOR_T */
	136, /* CURSOR_TR */
	70, /* CURSOR_L */
	52, /* CURSOR_C */
	96, /* CURSOR_R */
	12, /* CURSOR_BL */
	16, /* CURSOR_B */
	14 /* CURSOR_BR */
    };
    
    cursor_font = xcb_generate_id( c );
    xcb_open_font( c, cursor_font, strlen( cursor_font_name ),
		   cursor_font_name );
    for( i = 0; i < NUM_CURSORS; i++ ) {
	cursors[ i ] = xcb_generate_id( c );
	xcb_create_glyph_cursor( c, cursors[ i ], cursor_font, cursor_font,
				 cursor_glyphs[ i ], cursor_glyphs[ i ] | 1,
				 0, 0, 0, 0xFFFF, 0xFFFF, 0xFFFF );
    }
    xcb_close_font( c, cursor_font );

    /* Retrieve any RGB_DEFAULT_MAP properties on the roots. */
    for( i = 0; i < num_screens; i++ ) {
	union callback_param cp;

	cp.l = i;
	handle_async_reply( xcb_get_property( c, FALSE, screens[ i ]->root,
					      RGB_DEFAULT_MAP, RGB_COLOR_MAP,
					      0, 0x10000 ).sequence,
			    handle_get_default_map, cp );
    }
}

extern void decorate_render_init( void ) {

    FcPattern *pat, *font;
    FcResult r;
    FcValue v;
    FT_Error err;
    char *filename;
    int i, index;
    xcb_pixmap_t pixmap;
    uint32_t n;
    
    FcInit();

    pat = FcNameParse( FONT_NAME );

    FcConfigSubstitute( NULL, pat, FcMatchPattern );

    FcDefaultSubstitute( pat );

    font = FcFontMatch( NULL, pat, &r );

    FcPatternGet( font, FC_FILE, 0, &v );
    filename = (char *) v.u.s;
    FcPatternGet( font, FC_INDEX, 0, &v );
    index = v.u.i;

    if( ( err = FT_Init_FreeType( &ftl ) ) )
	fatal( "typeface initialisation error %d", err );

    if( ( err = FT_New_Face( ftl, filename, index, &ftf ) ) )
	fatal( "%s: could not load font (%d)", filename, err );

    FcPatternDestroy( pat );
    FcPatternDestroy( font );    

    FcFini();

    if( ( err = FT_Set_Char_Size( ftf, 0, FONT_SIZE << 6, 0, 0 ) ) )
	fatal( "%s: could not scale font (%d)", filename, err );

    if( ( err = FT_Select_Charmap( ftf, FT_ENCODING_UNICODE ) ) )
	fatal( "%s: could not select character map (%d)", filename, err );

    glyphset = xcb_generate_id( c );
    xcb_render_create_glyph_set( c, glyphset, fmt_a8 );

    pixmap = xcb_generate_id( c );
    
    pictures = xmalloc( num_screens * sizeof *pictures );

    n = XCB_RENDER_REPEAT_NORMAL;
    for( i = 0; i < num_screens; i++ ) {
	xcb_create_pixmap( c, screens[ i ]->root_depth, pixmap,
			   screens[ i ]->root, 1, 1 );
			   
	pictures[ i ].pic = xcb_generate_id( c );
	xcb_render_create_picture( c, pictures[ i ].pic, pixmap,
				   gwm_screens[ i ].root_pictformat,
				   XCB_RENDER_CP_REPEAT, &n );
	pictures[ i ].col = -1;
	
	xcb_free_pixmap( c, pixmap );
    }

    decorate_compat_init(); /* FIXME this is for pixel values (backgrounds)
			       and cursors */
}

extern void decorate_render_done( void ) {

#if DEBUG
    free( pictures );
    FT_Done_Face( ftf );
    FT_Done_FreeType( ftl );
#endif
}