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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 "structs.h"
#include "screen.h"
#include "common/tokenize.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;
}
/** Create a new Pango font.
* \param fontname Pango fontname (e.g. [FAMILY-LIST] [STYLE-OPTIONS] [SIZE]).
* \return A new font.
*/
font_t *
draw_font_new(const char *fontname)
{
cairo_surface_t *surface;
xcb_screen_t *s = xutil_screen_get(globalconf.connection, globalconf.default_screen);
cairo_t *cr;
PangoLayout *layout;
font_t *font = p_new(font_t, 1);
/* Create a dummy cairo surface, cairo context and pango layout in
* order to get font informations */
surface = cairo_xcb_surface_create(globalconf.connection,
globalconf.default_screen,
globalconf.screens.tab[0].visual,
s->width_in_pixels,
s->height_in_pixels);
cr = cairo_create(surface);
layout = pango_cairo_create_layout(cr);
/* Get the font description used to set text on a PangoLayout */
font->desc = pango_font_description_from_string(fontname);
pango_layout_set_font_description(layout, font->desc);
/* Get height */
pango_layout_get_pixel_size(layout, NULL, &font->height);
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return font;
}
/** Delete a font.
* \param font Font to delete.
*/
void
draw_font_delete(font_t **font)
{
if(*font)
{
pango_font_description_free((*font)->desc);
p_delete(font);
}
}
/** 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 phys_screen,
int width, int height, xcb_pixmap_t px,
const xcolor_t *fg, const xcolor_t *bg)
{
d->phys_screen = phys_screen;
d->width = width;
d->height = height;
d->pixmap = px;
d->surface = cairo_xcb_surface_create(globalconf.connection,
px, globalconf.screens.tab[phys_screen].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 margin Margin to respect when drawing text.
* \param area Area to draw to.
* \param ext Text extents.
*/
void
draw_text(draw_context_t *ctx, draw_text_context_t *data,
PangoEllipsizeMode ellip, PangoWrapMode wrap,
alignment_t align, padding_t *margin, area_t area, area_t *ext)
{
int x, y;
pango_layout_set_text(ctx->layout, data->text, data->len);
pango_layout_set_width(ctx->layout,
pango_units_from_double(area.width
- (margin->left
+ margin->right)));
pango_layout_set_height(ctx->layout, pango_units_from_double(area.height)
- (margin->top + margin->bottom));
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);
x = area.x + margin->left;
y = area.y + margin->top;
/* only honors alignment if enough space */
if(ext->width < area.width)
switch(align)
{
case AlignCenter:
x += (area.width - ext->width) / 2;
break;
case AlignRight:
x += area.width - ext->width;
break;
default:
break;
}
cairo_move_to(ctx->cr, x, 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);
}
/** Setup color-source for cairo (gradient or mono).
* \param ctx Draw context.
* \param gradient_vector x, y to x + x_offset, y + y_offset.
* \param pcolor Color to use at start of gradient_vector.
* \param pcolor_center Color at center of gradient_vector.
* \param pcolor_end Color at end of gradient_vector.
* \return pat Pattern or NULL, needs to get cairo_pattern_destroy()'ed.
*/
static cairo_pattern_t *
draw_setup_cairo_color_source(draw_context_t *ctx, vector_t gradient_vector,
const color_t *pcolor, const color_t *pcolor_center,
const color_t *pcolor_end)
{
cairo_pattern_t *pat = NULL;
bool has_center = pcolor_center->initialized;
bool has_end = pcolor_end->initialized;
/* no need for a real pattern: */
if(!has_end && !has_center)
cairo_set_source_rgba(ctx->cr,
pcolor->red / 255.0,
pcolor->green / 255.0,
pcolor->blue / 255.0,
pcolor->alpha / 255.0);
else
{
pat = cairo_pattern_create_linear(gradient_vector.x,
gradient_vector.y,
gradient_vector.x + gradient_vector.x_offset,
gradient_vector.y + gradient_vector.y_offset);
/* pcolor is always set (so far in awesome) */
cairo_pattern_add_color_stop_rgba(pat, 0.0,
pcolor->red / 255.0,
pcolor->green / 255.0,
pcolor->blue / 255.0,
pcolor->alpha / 255.0);
if(has_center)
cairo_pattern_add_color_stop_rgba(pat, 0.5,
pcolor_center->red / 255.0,
pcolor_center->green / 255.0,
pcolor_center->blue / 255.0,
pcolor_center->alpha / 255.0);
if(has_end)
cairo_pattern_add_color_stop_rgba(pat, 1.0,
pcolor_end->red / 255.0,
pcolor_end->green / 255.0,
pcolor_end->blue / 255.0,
pcolor_end->alpha / 255.0);
else
cairo_pattern_add_color_stop_rgba(pat, 1.0,
pcolor->red / 255.0,
pcolor->green / 255.0,
pcolor->blue / 255.0,
pcolor->alpha / 255.0);
cairo_set_source(ctx->cr, pat);
}
return pat;
}
/** 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 rectangle with gradient colors
* \param ctx Draw context.
* \param geometry Geometry.
* \param line_width Line width.
* \param filled Filled rectangle?
* \param gradient_vector Color-gradient course.
* \param pcolor Color at start of gradient_vector.
* \param pcolor_center Color in the center.
* \param pcolor_end Color at end of gradient_vector.
*/
void
draw_rectangle_gradient(draw_context_t *ctx, area_t geometry, float line_width, bool filled,
vector_t gradient_vector, const color_t *pcolor,
const color_t *pcolor_center, const color_t *pcolor_end)
{
cairo_pattern_t *pat;
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);
pat = draw_setup_cairo_color_source(ctx, gradient_vector, pcolor, pcolor_center, pcolor_end);
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 + 1, geometry.y, geometry.width - 1, geometry.height - 1);
cairo_stroke(ctx->cr);
}
if(pat)
cairo_pattern_destroy(pat);
}
/** Setup some cairo-things for drawing a graph
* \param ctx Draw context
*/
void
draw_graph_setup(draw_context_t *ctx)
{
cairo_set_antialias(ctx->cr, CAIRO_ANTIALIAS_NONE);
cairo_set_line_width(ctx->cr, 1.0);
/* without it, it can draw over the path on sharp angles
* ...too long lines * (...graph_line) */
cairo_set_miter_limit(ctx->cr, 0.0);
cairo_set_line_join(ctx->cr, CAIRO_LINE_JOIN_MITER);
}
/** Draw a graph.
* \param ctx Draw context.
* \param rect The area to draw into.
* \param from Array of starting-point offsets to draw a graph lines.
* \param to Array of end-point offsets to draw a graph lines.
* \param cur_index Current position in data-array (cycles around).
* \param grow Put new values to the left or to the right.
* \param gradient_vector Color-Gradient course.
* \param pcolor Color at start of gradient_vector.
* \param pcolor_center Color in the center.
* \param pcolor_end Color at end of gradient_vector.
*/
void
draw_graph(draw_context_t *ctx, area_t rect, int *from, int *to, int cur_index,
position_t grow, vector_t gradient_vector, const color_t *pcolor,
const color_t *pcolor_center, const color_t *pcolor_end)
{
int i = -1;
float x = rect.x + 0.5; /* middle of a pixel */
cairo_pattern_t *pat;
pat = draw_setup_cairo_color_source(ctx, gradient_vector,
pcolor, pcolor_center, pcolor_end);
if(grow == Right) /* draw from right to left */
{
x += rect.width - 1;
while(++i < rect.width)
{
cairo_move_to(ctx->cr, x, rect.y - from[cur_index]);
cairo_line_to(ctx->cr, x, rect.y - to[cur_index]);
x -= 1.0;
if(--cur_index < 0)
cur_index = rect.width - 1;
}
}
else /* draw from left to right */
while(++i < rect.width)
{
cairo_move_to(ctx->cr, x, rect.y - from[cur_index]);
cairo_line_to(ctx->cr, x, rect.y - to[cur_index]);
x += 1.0;
if(--cur_index < 0)
cur_index = rect.width - 1;
}
cairo_stroke(ctx->cr);
if(pat)
cairo_pattern_destroy(pat);
}
/** Draw a line into a graph-widget.
* \param ctx Draw context.
* \param rect The area to draw into.
* \param to array of offsets to draw the line through...
* \param cur_index current position in data-array (cycles around)
* \param grow put new values to the left or to the right
* \param gradient_vector Color-gradient course.
* \param pcolor Color at start of gradient_vector.
* \param pcolor_center Color in the center.
* \param pcolor_end Color at end of gradient_vector.
*/
void
draw_graph_line(draw_context_t *ctx, area_t rect, int *to, int cur_index,
position_t grow, vector_t gradient_vector, const color_t *pcolor,
const color_t *pcolor_center, const color_t *pcolor_end)
{
int i, w;
float x, y;
cairo_pattern_t *pat;
/* NOTE: without, it sometimes won't draw to some path (centered in a pixel)
* ... it won't fill some pixels! It also looks much nicer so.
* (since line-drawing is the last on the graph, no need to reset to _NONE) */
/* Not much difference to CAIRO_ANTIALIAS_DEFAULT, but recommend for LCD */
cairo_set_antialias(ctx->cr, CAIRO_ANTIALIAS_SUBPIXEL);
/* a nicer, better visible line compared to 1.0 */
cairo_set_line_width(ctx->cr, 1.25);
pat = draw_setup_cairo_color_source(ctx, gradient_vector, pcolor, pcolor_center, pcolor_end);
/* path through the centers of pixels */
x = rect.x + 0.5;
y = rect.y + 0.5;
w = rect.width;
if(grow == Right)
{
/* go through the values from old to new. Begin with the oldest. */
if(++cur_index > w - 1)
cur_index = 0;
cairo_move_to(ctx->cr, x, y - to[cur_index]);
}
else
/* on the left border: fills a pixel also when there's only one value */
cairo_move_to(ctx->cr, x - 1.0, y - to[cur_index]);
for(i = 0; i < w; i++)
{
cairo_line_to(ctx->cr, x, y - to[cur_index]);
x += 1.0;
/* cycles around the index */
if(grow == Right)
{
if(++cur_index > w - 1)
cur_index = 0;
}
else
{
if(--cur_index < 0)
cur_index = w - 1;
}
}
/* onto the right border: fills a pixel also when there's only one value */
if(grow == Right)
cairo_line_to(ctx->cr, x, y - to[(cur_index + (w - 1)) % w]);
cairo_stroke(ctx->cr);
if(pat)
cairo_pattern_destroy(pat);
/* reset line-width */
cairo_set_line_width(ctx->cr, 1.0);
}
/** Draw an image from ARGB data to a draw context.
* Data should be stored as an array of alpha, red, blue, green for each pixel
* and the array size should be w * h elements long.
* \param ctx Draw context to draw to.
* \param x X coordinate.
* \param y Y coordinate.
* \param w Width.
* \param h Height.
* \param ratio The ratio to apply to the image.
* \param data The image pixels array.
*/
static void
draw_image_from_argb_data(draw_context_t *ctx, int x, int y, int w, int h,
double ratio, unsigned char *data)
{
cairo_t *cr;
cairo_surface_t *source;
source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h,
#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)
sizeof(unsigned char) * 4 * w);
#else
cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w));
#endif
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);
cairo_surface_destroy(source);
}
/** 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 image The image to draw.
*/
void
draw_image(draw_context_t *ctx, int x, int y, double ratio, image_t *image)
{
draw_image_from_argb_data(ctx, x, y, image_getwidth(image), image_getheight(image), ratio, image_getdata(image));
}
/** 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.screens.tab[ctx->phys_screen].visual,
dest_w, dest_h);
source = cairo_xcb_surface_create(globalconf.connection, src,
globalconf.screens.tab[ctx->phys_screen].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;
xcb_screen_t *s = xutil_screen_get(globalconf.connection, globalconf.default_screen);
area_t geom = { 0, 0, 0, 0 };
if(data->len <= 0)
return geom;
surface = cairo_xcb_surface_create(globalconf.connection,
globalconf.default_screen,
globalconf.screens.tab[0].visual,
s->width_in_pixels,
s->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 Atring with align text.
* \param len The string length.
* \return An alignment_t type.
*/
alignment_t
draw_align_fromstr(const char *align, ssize_t len)
{
switch(a_tokenize(align, len))
{
case A_TK_CENTER: return AlignCenter;
case A_TK_RIGHT: return AlignRight;
case A_TK_TOP: return AlignTop;
case A_TK_BOTTOM: return AlignBottom;
case A_TK_MIDDLE: return AlignMiddle;
default: 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;
}
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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