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awesome/draw.c

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/*
* draw.c - draw functions
*
* Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <cairo-xcb.h>
#include "config.h"
#include <langinfo.h>
#include <iconv.h>
#include <errno.h>
#include <ctype.h>
#include <math.h>
#include "globalconf.h"
#include "screen.h"
#include "common/xutil.h"
/** Convert text from any charset to UTF-8 using iconv.
* \param iso The ISO string to convert.
* \param len The string size.
* \param dest The destination pointer. Memory will be allocated, up to you to
* free, like any char *.
* \param dlen The destination length, can be NULL.
* \return True if conversion was done.
*/
bool
draw_iso2utf8(const char *iso, size_t len, char **dest, ssize_t *dlen)
{
static iconv_t iso2utf8 = (iconv_t) -1;
static int8_t dont_need_convert = -1;
if(dont_need_convert == -1)
dont_need_convert = !a_strcmp(nl_langinfo(CODESET), "UTF-8");
if(!len || dont_need_convert)
return false;
if(iso2utf8 == (iconv_t) -1)
{
iso2utf8 = iconv_open("UTF-8", nl_langinfo(CODESET));
if(iso2utf8 == (iconv_t) -1)
{
if(errno == EINVAL)
warn("unable to convert text from %s to UTF-8, not available",
nl_langinfo(CODESET));
else
warn("unable to convert text: %s", strerror(errno));
return false;
}
}
size_t orig_utf8len, utf8len;
char *utf8;
orig_utf8len = utf8len = 2 * len + 1;
utf8 = *dest = p_new(char, utf8len);
if(iconv(iso2utf8, (char **) &iso, &len, &utf8, &utf8len) == (size_t) -1)
{
warn("text conversion failed: %s", strerror(errno));
p_delete(dest);
return false;
}
if(dlen)
*dlen = orig_utf8len - utf8len;
return true;
}
/** Initialize a draw_text_context_t with text data.
* \param data The draw text context to init.
* \param str The text string to render.
* \param slen The text string length.
* \return True if everything is ok, false otherwise.
*/
bool
draw_text_context_init(draw_text_context_t *data, const char *str, ssize_t slen)
{
GError *error = NULL;
if(!str)
return false;
if(!pango_parse_markup(str, slen, 0, &data->attr_list, &data->text, NULL, &error))
{
warn("cannot parse pango markup: %s", error ? error->message : "unknown error");
if(error)
g_error_free(error);
return false;
}
data->len = a_strlen(data->text);
return true;
}
/** Initialize a new draw context.
* \param d The draw context to initialize.
* \param phys_screen Physical screen id.
* \param width Width.
* \param height Height.
* \param px Pixmap object to store.
* \param fg Foreground color.
* \param bg Background color.
*/
void
draw_context_init(draw_context_t *d,
int width, int height, xcb_pixmap_t px,
const xcolor_t *fg, const xcolor_t *bg)
{
d->width = width;
d->height = height;
d->pixmap = px;
d->surface = cairo_xcb_surface_create(globalconf.connection,
px, globalconf.visual,
width, height);
d->cr = cairo_create(d->surface);
d->layout = pango_cairo_create_layout(d->cr);
d->fg = *fg;
d->bg = *bg;
};
/** Draw text into a draw context.
* \param ctx Draw context to draw to.
* \param data Draw text context data.
* \param ellip Ellipsize mode.
* \param wrap Wrap mode.
* \param align Text alignment.
* \param valign Vertical text alignment.
* \param area Area to draw to.
*/
void
draw_text(draw_context_t *ctx, draw_text_context_t *data,
PangoEllipsizeMode ellip, PangoWrapMode wrap,
alignment_t align, alignment_t valign, area_t area)
{
pango_layout_set_text(ctx->layout, data->text, data->len);
pango_layout_set_width(ctx->layout,
pango_units_from_double(area.width));
pango_layout_set_height(ctx->layout, pango_units_from_double(area.height));
pango_layout_set_ellipsize(ctx->layout, ellip);
pango_layout_set_wrap(ctx->layout, wrap);
pango_layout_set_attributes(ctx->layout, data->attr_list);
pango_layout_set_font_description(ctx->layout, globalconf.font->desc);
PangoRectangle ext;
pango_layout_get_pixel_extents(ctx->layout, NULL, &ext);
switch(align)
{
case AlignCenter:
area.x += (area.width - ext.width) / 2;
break;
case AlignRight:
area.x += area.width - ext.width;
break;
default:
break;
}
switch(valign)
{
case AlignCenter:
area.y += (area.height - ext.height) / 2;
break;
case AlignBottom:
area.y += area.height - ext.height;
break;
default:
break;
}
cairo_move_to(ctx->cr, area.x, area.y);
cairo_set_source_rgba(ctx->cr,
ctx->fg.red / 65535.0,
ctx->fg.green / 65535.0,
ctx->fg.blue / 65535.0,
ctx->fg.alpha / 65535.0);
pango_cairo_update_layout(ctx->cr, ctx->layout);
pango_cairo_show_layout(ctx->cr, ctx->layout);
}
/** Draw rectangle inside the coordinates
* \param ctx Draw context
* \param geometry geometry
* \param line_width line width
* \param filled fill rectangle?
* \param color color to use
*/
void
draw_rectangle(draw_context_t *ctx, area_t geometry,
float line_width, bool filled, const color_t *color)
{
cairo_set_antialias(ctx->cr, CAIRO_ANTIALIAS_NONE);
cairo_set_line_width(ctx->cr, line_width);
cairo_set_miter_limit(ctx->cr, 10.0);
cairo_set_line_join(ctx->cr, CAIRO_LINE_JOIN_MITER);
cairo_set_source_rgba(ctx->cr,
color->red / 255.0,
color->green / 255.0,
color->blue / 255.0,
color->alpha / 255.0);
if(filled)
{
cairo_rectangle(ctx->cr, geometry.x, geometry.y,
geometry.width, geometry.height);
cairo_fill(ctx->cr);
}
else
{
cairo_rectangle(ctx->cr, geometry.x + line_width / 2.0, geometry.y + line_width / 2.0,
geometry.width - line_width, geometry.height - line_width);
cairo_stroke(ctx->cr);
}
}
/** Draw an image to a draw context.
* \param ctx Draw context to draw to.
* \param x X coordinate.
* \param y Y coordinate.
* \param ratio The ratio to apply to the image.
* \param source The image to draw.
*/
void
draw_surface(draw_context_t *ctx, int x, int y,
double ratio, cairo_surface_t *source)
{
cairo_t *cr = cairo_create(ctx->surface);
cairo_scale(cr, ratio, ratio);
cairo_set_source_surface(cr, source, x / ratio, y / ratio);
cairo_paint(cr);
cairo_destroy(cr);
}
/** Rotate a pixmap.
* \param ctx Draw context to draw with.
* \param src Drawable to draw from.
* \param dest Drawable to draw to.
* \param src_w Drawable width.
* \param src_h Drawable height.
* \param dest_w Drawable width.
* \param dest_h Drawable height.
* \param angle angle to rotate.
* \param tx Translate to this x coordinate.
* \param ty Translate to this y coordinate.
*/
void
draw_rotate(draw_context_t *ctx,
xcb_pixmap_t src, xcb_pixmap_t dest,
int src_w, int src_h,
int dest_w, int dest_h,
double angle, int tx, int ty)
{
cairo_surface_t *surface, *source;
cairo_t *cr;
surface = cairo_xcb_surface_create(globalconf.connection, dest,
globalconf.visual,
dest_w, dest_h);
source = cairo_xcb_surface_create(globalconf.connection, src,
globalconf.visual,
src_w, src_h);
cr = cairo_create (surface);
cairo_translate(cr, tx, ty);
cairo_rotate(cr, angle);
cairo_set_source_surface(cr, source, 0.0, 0.0);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(source);
cairo_surface_destroy(surface);
}
/** Return the width and height of a text in pixel.
* \param data The draw context text data.
* \return Text height and width.
*/
area_t
draw_text_extents(draw_text_context_t *data)
{
cairo_surface_t *surface;
cairo_t *cr;
PangoLayout *layout;
PangoRectangle ext;
area_t geom = { 0, 0, 0, 0 };
if(data->len <= 0)
return geom;
surface = cairo_xcb_surface_create(globalconf.connection,
globalconf.default_screen,
globalconf.visual,
globalconf.screen->width_in_pixels,
globalconf.screen->height_in_pixels);
cr = cairo_create(surface);
layout = pango_cairo_create_layout(cr);
pango_layout_set_text(layout, data->text, data->len);
pango_layout_set_attributes(layout, data->attr_list);
pango_layout_set_font_description(layout, globalconf.font->desc);
pango_layout_get_pixel_extents(layout, NULL, &ext);
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
geom.width = ext.width;
geom.height = ext.height;
return geom;
}
/** Transform a string to a alignment_t type.
* Recognized string are flex, fixed, left, center, middle or right.
* \param align A string with align text.
* \return An alignment_t type.
*/
alignment_t
draw_align_fromstr(const char *align)
{
if(a_strcmp(align, "center") == 0)
return AlignCenter;
if(a_strcmp(align, "right") == 0)
return AlignRight;
if(a_strcmp(align, "top") == 0)
return AlignTop;
if(a_strcmp(align, "bottom") == 0)
return AlignBottom;
if(a_strcmp(align, "middle") == 0)
return AlignMiddle;
return AlignLeft;
}
/** Transform an alignment to a string.
* \param a The alignment.
* \return A string which must not be freed.
*/
const char *
draw_align_tostr(alignment_t a)
{
switch(a)
{
case AlignLeft: return "left";
case AlignCenter: return "center";
case AlignRight: return "right";
case AlignBottom: return "bottom";
case AlignTop: return "top";
case AlignMiddle: return "middle";
default: return NULL;
}
}
static cairo_user_data_key_t data_key;
static inline void
free_data(void *data)
{
p_delete(&data);
}
/** Create a surface object on the lua stack from this image data.
* \param L The lua stack.
* \param width The width of the image.
* \param height The height of the image
* \param data The image's data in ARGB format, will be copied by this function.
* \return Number of items pushed on the lua stack.
*/
int
luaA_surface_from_data(lua_State *L, int width, int height, uint32_t *data)
{
unsigned long int len = width * height;
unsigned char *buffer = p_dup(data, len);
cairo_surface_t *surface =
cairo_image_surface_create_for_data(buffer,
CAIRO_FORMAT_ARGB32,
width,
height,
width*4);
/* This makes sure that buffer will be freed */
cairo_surface_set_user_data(surface, &data_key, buffer, &free_data);
/* This will increase the reference count of the surface */
int ret = oocairo_surface_push(globalconf.L, surface);
/* So we have to drop our own reference */
cairo_surface_destroy(surface);
return ret;
}
/** Duplicate the specified image surface.
* \param surface The surface to copy
* \return A pointer to a new cairo image surface.
*/
cairo_surface_t *
draw_dup_image_surface(cairo_surface_t *surface)
{
cairo_surface_t *res = cairo_image_surface_create(
cairo_image_surface_get_format(surface),
cairo_image_surface_get_width(surface),
cairo_image_surface_get_height(surface));
cairo_t *cr = cairo_create(res);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_destroy(cr);
return res;
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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