406 lines
12 KiB
C
406 lines
12 KiB
C
/*
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* draw.c - draw functions
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*
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* Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <cairo-xcb.h>
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#include "config.h"
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#include <langinfo.h>
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#include <iconv.h>
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#include <errno.h>
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#include <ctype.h>
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#include <math.h>
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#include "globalconf.h"
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#include "screen.h"
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#include "common/tokenize.h"
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#include "common/xutil.h"
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/** Convert text from any charset to UTF-8 using iconv.
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* \param iso The ISO string to convert.
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* \param len The string size.
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* \param dest The destination pointer. Memory will be allocated, up to you to
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* free, like any char *.
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* \param dlen The destination length, can be NULL.
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* \return True if conversion was done.
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*/
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bool
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draw_iso2utf8(const char *iso, size_t len, char **dest, ssize_t *dlen)
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{
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static iconv_t iso2utf8 = (iconv_t) -1;
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static int8_t dont_need_convert = -1;
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if(dont_need_convert == -1)
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dont_need_convert = !a_strcmp(nl_langinfo(CODESET), "UTF-8");
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if(!len || dont_need_convert)
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return false;
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if(iso2utf8 == (iconv_t) -1)
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{
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iso2utf8 = iconv_open("UTF-8", nl_langinfo(CODESET));
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if(iso2utf8 == (iconv_t) -1)
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{
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if(errno == EINVAL)
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warn("unable to convert text from %s to UTF-8, not available",
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nl_langinfo(CODESET));
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else
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warn("unable to convert text: %s", strerror(errno));
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return false;
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}
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}
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size_t orig_utf8len, utf8len;
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char *utf8;
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orig_utf8len = utf8len = 2 * len + 1;
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utf8 = *dest = p_new(char, utf8len);
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if(iconv(iso2utf8, (char **) &iso, &len, &utf8, &utf8len) == (size_t) -1)
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{
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warn("text conversion failed: %s", strerror(errno));
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p_delete(dest);
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return false;
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}
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if(dlen)
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*dlen = orig_utf8len - utf8len;
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return true;
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}
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/** Initialize a draw_text_context_t with text data.
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* \param data The draw text context to init.
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* \param str The text string to render.
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* \param slen The text string length.
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* \return True if everything is ok, false otherwise.
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*/
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bool
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draw_text_context_init(draw_text_context_t *data, const char *str, ssize_t slen)
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{
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GError *error = NULL;
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if(!str)
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return false;
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if(!pango_parse_markup(str, slen, 0, &data->attr_list, &data->text, NULL, &error))
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{
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warn("cannot parse pango markup: %s", error ? error->message : "unknown error");
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if(error)
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g_error_free(error);
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return false;
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}
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data->len = a_strlen(data->text);
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return true;
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}
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/** Initialize a new draw context.
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* \param d The draw context to initialize.
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* \param phys_screen Physical screen id.
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* \param width Width.
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* \param height Height.
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* \param px Pixmap object to store.
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* \param fg Foreground color.
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* \param bg Background color.
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*/
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void
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draw_context_init(draw_context_t *d,
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int width, int height, xcb_pixmap_t px,
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const xcolor_t *fg, const xcolor_t *bg)
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{
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d->width = width;
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d->height = height;
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d->pixmap = px;
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d->surface = cairo_xcb_surface_create(globalconf.connection,
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px, globalconf.visual,
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width, height);
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d->cr = cairo_create(d->surface);
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d->layout = pango_cairo_create_layout(d->cr);
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d->fg = *fg;
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d->bg = *bg;
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};
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/** Draw text into a draw context.
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* \param ctx Draw context to draw to.
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* \param data Draw text context data.
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* \param ellip Ellipsize mode.
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* \param wrap Wrap mode.
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* \param align Text alignment.
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* \param valign Vertical text alignment.
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* \param area Area to draw to.
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*/
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void
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draw_text(draw_context_t *ctx, draw_text_context_t *data,
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PangoEllipsizeMode ellip, PangoWrapMode wrap,
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alignment_t align, alignment_t valign, area_t area)
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{
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pango_layout_set_text(ctx->layout, data->text, data->len);
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pango_layout_set_width(ctx->layout,
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pango_units_from_double(area.width));
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pango_layout_set_height(ctx->layout, pango_units_from_double(area.height));
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pango_layout_set_ellipsize(ctx->layout, ellip);
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pango_layout_set_wrap(ctx->layout, wrap);
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pango_layout_set_attributes(ctx->layout, data->attr_list);
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pango_layout_set_font_description(ctx->layout, globalconf.font->desc);
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PangoRectangle ext;
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pango_layout_get_pixel_extents(ctx->layout, NULL, &ext);
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switch(align)
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{
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case AlignCenter:
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area.x += (area.width - ext.width) / 2;
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break;
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case AlignRight:
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area.x += area.width - ext.width;
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break;
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default:
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break;
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}
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switch(valign)
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{
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case AlignCenter:
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area.y += (area.height - ext.height) / 2;
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break;
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case AlignBottom:
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area.y += area.height - ext.height;
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break;
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default:
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break;
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}
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cairo_move_to(ctx->cr, area.x, area.y);
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cairo_set_source_rgba(ctx->cr,
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ctx->fg.red / 65535.0,
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ctx->fg.green / 65535.0,
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ctx->fg.blue / 65535.0,
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ctx->fg.alpha / 65535.0);
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pango_cairo_update_layout(ctx->cr, ctx->layout);
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pango_cairo_show_layout(ctx->cr, ctx->layout);
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}
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/** Draw rectangle inside the coordinates
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* \param ctx Draw context
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* \param geometry geometry
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* \param line_width line width
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* \param filled fill rectangle?
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* \param color color to use
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*/
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void
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draw_rectangle(draw_context_t *ctx, area_t geometry,
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float line_width, bool filled, const color_t *color)
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{
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cairo_set_antialias(ctx->cr, CAIRO_ANTIALIAS_NONE);
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cairo_set_line_width(ctx->cr, line_width);
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cairo_set_miter_limit(ctx->cr, 10.0);
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cairo_set_line_join(ctx->cr, CAIRO_LINE_JOIN_MITER);
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cairo_set_source_rgba(ctx->cr,
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color->red / 255.0,
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color->green / 255.0,
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color->blue / 255.0,
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color->alpha / 255.0);
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if(filled)
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{
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cairo_rectangle(ctx->cr, geometry.x, geometry.y,
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geometry.width, geometry.height);
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cairo_fill(ctx->cr);
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}
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else
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{
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cairo_rectangle(ctx->cr, geometry.x + line_width / 2.0, geometry.y + line_width / 2.0,
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geometry.width - line_width, geometry.height - line_width);
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cairo_stroke(ctx->cr);
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}
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}
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/** Draw an image from ARGB data to a draw context.
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* Data should be stored as an array of alpha, red, blue, green for each pixel
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* and the array size should be w * h elements long.
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* \param ctx Draw context to draw to.
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* \param x X coordinate.
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* \param y Y coordinate.
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* \param w Width.
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* \param h Height.
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* \param ratio The ratio to apply to the image.
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* \param data The image pixels array.
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*/
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static void
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draw_image_from_argb_data(draw_context_t *ctx, int x, int y, int w, int h,
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double ratio, unsigned char *data)
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{
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cairo_t *cr;
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cairo_surface_t *source;
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source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h,
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#if CAIRO_VERSION_MAJOR < 1 || (CAIRO_VERSION_MAJOR == 1 && CAIRO_VERSION_MINOR < 5) || (CAIRO_VERSION_MAJOR == 1 && CAIRO_VERSION_MINOR == 5 && CAIRO_VERSION_MICRO < 8)
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sizeof(unsigned char) * 4 * w);
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#else
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cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w));
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#endif
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cr = cairo_create(ctx->surface);
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cairo_scale(cr, ratio, ratio);
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cairo_set_source_surface(cr, source, x / ratio, y / ratio);
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cairo_paint(cr);
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cairo_destroy(cr);
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cairo_surface_destroy(source);
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}
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/** Draw an image to a draw context.
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* \param ctx Draw context to draw to.
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* \param x X coordinate.
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* \param y Y coordinate.
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* \param ratio The ratio to apply to the image.
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* \param image The image to draw.
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*/
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void
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draw_image(draw_context_t *ctx, int x, int y, double ratio, image_t *image)
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{
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draw_image_from_argb_data(ctx, x, y, image_getwidth(image), image_getheight(image), ratio, image_getdata(image));
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}
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/** Rotate a pixmap.
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* \param ctx Draw context to draw with.
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* \param src Drawable to draw from.
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* \param dest Drawable to draw to.
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* \param src_w Drawable width.
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* \param src_h Drawable height.
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* \param dest_w Drawable width.
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* \param dest_h Drawable height.
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* \param angle angle to rotate.
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* \param tx Translate to this x coordinate.
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* \param ty Translate to this y coordinate.
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*/
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void
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draw_rotate(draw_context_t *ctx,
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xcb_pixmap_t src, xcb_pixmap_t dest,
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int src_w, int src_h,
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int dest_w, int dest_h,
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double angle, int tx, int ty)
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{
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cairo_surface_t *surface, *source;
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cairo_t *cr;
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surface = cairo_xcb_surface_create(globalconf.connection, dest,
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globalconf.visual,
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dest_w, dest_h);
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source = cairo_xcb_surface_create(globalconf.connection, src,
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globalconf.visual,
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src_w, src_h);
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cr = cairo_create (surface);
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cairo_translate(cr, tx, ty);
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cairo_rotate(cr, angle);
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cairo_set_source_surface(cr, source, 0.0, 0.0);
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cairo_paint(cr);
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cairo_destroy(cr);
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cairo_surface_destroy(source);
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cairo_surface_destroy(surface);
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}
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/** Return the width and height of a text in pixel.
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* \param data The draw context text data.
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* \return Text height and width.
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*/
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area_t
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draw_text_extents(draw_text_context_t *data)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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PangoLayout *layout;
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PangoRectangle ext;
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area_t geom = { 0, 0, 0, 0 };
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if(data->len <= 0)
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return geom;
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surface = cairo_xcb_surface_create(globalconf.connection,
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globalconf.default_screen,
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globalconf.visual,
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globalconf.screen->width_in_pixels,
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globalconf.screen->height_in_pixels);
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cr = cairo_create(surface);
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layout = pango_cairo_create_layout(cr);
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pango_layout_set_text(layout, data->text, data->len);
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pango_layout_set_attributes(layout, data->attr_list);
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pango_layout_set_font_description(layout, globalconf.font->desc);
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pango_layout_get_pixel_extents(layout, NULL, &ext);
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g_object_unref(layout);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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geom.width = ext.width;
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geom.height = ext.height;
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return geom;
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}
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/** Transform a string to a alignment_t type.
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* Recognized string are flex, fixed, left, center, middle or right.
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* \param align A string with align text.
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* \param len The string length.
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* \return An alignment_t type.
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*/
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alignment_t
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draw_align_fromstr(const char *align, ssize_t len)
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{
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switch(a_tokenize(align, len))
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{
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case A_TK_CENTER: return AlignCenter;
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case A_TK_RIGHT: return AlignRight;
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case A_TK_TOP: return AlignTop;
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case A_TK_BOTTOM: return AlignBottom;
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case A_TK_MIDDLE: return AlignMiddle;
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default: return AlignLeft;
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}
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}
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/** Transform an alignment to a string.
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* \param a The alignment.
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* \return A string which must not be freed.
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*/
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const char *
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draw_align_tostr(alignment_t a)
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{
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switch(a)
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{
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case AlignLeft: return "left";
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case AlignCenter: return "center";
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case AlignRight: return "right";
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case AlignBottom: return "bottom";
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case AlignTop: return "top";
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case AlignMiddle: return "middle";
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default: return NULL;
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}
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}
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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