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awesome/common/draw.c

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/*
* draw.c - draw functions
*
* Copyright © 2007-2008 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-xlib.h>
#ifdef HAVE_GTK
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#else
#include <Imlib2.h>
#endif
#include <langinfo.h>
#include <iconv.h>
#include <errno.h>
#include <math.h>
#include "draw.h"
#include "common/util.h"
/** Convert text from any charset to UTF-8 using iconv
* \param iso the ISO string to convert
* \return NULL if error, otherwise pointer to the new converted string
*/
static char *
draw_iso2utf8(char *iso)
{
iconv_t iso2utf8;
size_t len, utf8len;
char *utf8, *utf8p;
if(!(len = a_strlen(iso)))
return NULL;
if(!a_strcmp(nl_langinfo(CODESET), "UTF-8"))
return NULL;
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\n", strerror(errno));
return NULL;
}
utf8len = 2 * len + 1;
utf8 = utf8p = p_new(char, utf8len);
if(iconv(iso2utf8, &iso, &len, &utf8, &utf8len) == (size_t) -1)
{
warn("text conversion failed: %s\n", strerror(errno));
p_delete(&utf8p);
}
if(iconv_close(iso2utf8))
warn("error closing iconv");
return utf8p;
}
/** Get a draw context
* \param disp Display ref
* \param phys_screen physical screen id
* \param width width
* \param height height
* \param dw Drawable object to store in DrawCtx
* \return draw context ref
*/
DrawCtx *
draw_context_new(Display *disp, int phys_screen, int width, int height, Drawable dw)
{
DrawCtx *d = p_new(DrawCtx, 1);
d->display = disp;
d->phys_screen = phys_screen;
d->width = width;
d->height = height;
d->depth = DefaultDepth(disp, phys_screen);
d->visual = DefaultVisual(disp, phys_screen);
d->drawable = dw;
d->surface = cairo_xlib_surface_create(disp, dw, d->visual, width, height);
d->cr = cairo_create(d->surface);
d->layout = pango_cairo_create_layout(d->cr);
return d;
};
/** Delete a draw context
* \param ctx DrawCtx to delete
*/
void
draw_context_delete(DrawCtx **ctx)
{
g_object_unref((*ctx)->layout);
cairo_surface_destroy((*ctx)->surface);
cairo_destroy((*ctx)->cr);
p_delete(ctx);
}
/** Create a new Pango font
* \param disp Display ref
* \param fontname Pango fontname (e.g. [FAMILY-LIST] [STYLE-OPTIONS] [SIZE])
* \return a new font
*/
font_t *
draw_font_new(Display *disp, char *fontname)
{
cairo_surface_t *surface;
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_xlib_surface_create(disp,
DefaultScreen(disp),
DefaultVisual(disp, DefaultScreen(disp)),
DisplayWidth(disp, DefaultScreen(disp)),
DisplayHeight(disp, DefaultScreen(disp)));
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);
/* At the moment, we don't need ascent/descent but maybe it could
* be useful in the future... */
#if 0
PangoContext *context;
PangoFontMetrics *font_metrics;
/* Get ascent and descent */
context = pango_layout_get_context(layout);
font_metrics = pango_context_get_metrics(context, font->desc, NULL);
/* Values in PangoFontMetrics are given in Pango units */
font->ascent = PANGO_PIXELS(pango_font_metrics_get_ascent(font_metrics));
font->descent = PANGO_PIXELS(pango_font_metrics_get_descent(font_metrics));
pango_font_metrics_unref(font_metrics);
#endif
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return font;
}
/** Delete a font
* \param font font_t to delete
*/
void
draw_font_delete(font_t **font)
{
pango_font_description_free((*font)->desc);
p_delete(font);
}
/** Draw text into a draw context
* \param ctx DrawCtx to draw to
* \param area area to draw to
* \param align alignment
* \param padding padding to add before drawing the text
* \param font font to use
* \param text text to draw
* \param enable shadow
* \param fg foreground color
* \param bg background color
*/
void
draw_text(DrawCtx *ctx,
area_t area,
Alignment align,
int padding,
char *text,
style_t style)
{
int nw = 0, x, y;
ssize_t len, olen;
char *buf = NULL, *utf8 = NULL;
draw_rectangle(ctx, area, 1.0, True, style.bg);
if(!(len = olen = a_strlen(text)))
return;
/* try to convert it to UTF-8 */
if((utf8 = draw_iso2utf8(text)))
{
buf = utf8;
len = olen = a_strlen(buf);
}
else
buf = a_strdup(text);
/* check that the text is not too long */
while(len && (nw = (draw_textwidth(ctx->display, style.font, buf)) + padding * 2) > area.width)
{
len--;
/* we can't blindly null the char, we need to check if it's not part of
* a multi byte char: if mbtowc return -1, we know that we must go back
* in the string to find the beginning of the multi byte char */
while(len && mbtowc(NULL, buf + len, a_strlen(buf + len)) < 0)
len--;
buf[len] = '\0';
}
if(nw > area.width)
return; /* too long */
if(len < olen)
{
if(len > 1)
buf[len - 1] = '.';
if(len > 2)
buf[len - 2] = '.';
if(len > 3)
buf[len - 3] = '.';
}
pango_layout_set_text(ctx->layout, buf, -1);
pango_layout_set_font_description(ctx->layout, style.font->desc);
x = area.x + padding;
/* + 1 is added for rounding, so that in any case of doubt we rather draw
* the text 1px lower than too high which usually results in a better type
* face */
y = area.y + (ctx->height - style.font->height + 1) / 2;
switch(align)
{
case AlignCenter:
x += (area.width - nw) / 2;
break;
case AlignRight:
x += area.width - nw;
break;
default:
break;
}
if(style.shadow_offset > 0)
{
cairo_set_source_rgb(ctx->cr,
style.shadow.red / 65535.0,
style.shadow.green / 65535.0,
style.shadow.blue / 65535.0);
cairo_move_to(ctx->cr, x + style.shadow_offset, y + style.shadow_offset);
pango_cairo_update_layout(ctx->cr, ctx->layout);
pango_cairo_show_layout(ctx->cr, ctx->layout);
}
cairo_set_source_rgb(ctx->cr,
style.fg.red / 65535.0,
style.fg.green / 65535.0,
style.fg.blue / 65535.0);
cairo_move_to(ctx->cr, x, y);
pango_cairo_update_layout(ctx->cr, ctx->layout);
pango_cairo_show_layout(ctx->cr, ctx->layout);
p_delete(&buf);
}
/** Setup color-source for cairo (gradient or mono)
* \param ctx Draw context
* \param rect x,y to x+x_offset,y+y_offset
* \param color color to use at start (x,y)
* \param pcolor_center color at 50% of width
* \param pcolor_end color at pattern end (x + x_offset, y + y_offset)
* \return pat pattern or NULL; needs to get cairo_pattern_destroy()'ed;
*/
static cairo_pattern_t *
draw_setup_cairo_color_source(DrawCtx *ctx, area_t rect,
XColor *pcolor, XColor *pcolor_center,
XColor *pcolor_end)
{
cairo_pattern_t *pat = NULL;
/* no need for a real pattern: */
if(!pcolor_end && !pcolor_center)
cairo_set_source_rgb(ctx->cr, pcolor->red / 65535.0, pcolor->green / 65535.0, pcolor->blue / 65535.0);
else
{
pat = cairo_pattern_create_linear(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
/* pcolor is always set (so far in awesome) */
cairo_pattern_add_color_stop_rgb(pat, 0.0, pcolor->red / 65535.0,
pcolor->green / 65535.0, pcolor->blue / 65535.0);
if(pcolor_center)
cairo_pattern_add_color_stop_rgb(pat, 0.5, pcolor_center->red / 65535.0,
pcolor_center->green / 65535.0, pcolor_center->blue / 65535.0);
if(pcolor_end)
cairo_pattern_add_color_stop_rgb(pat, 1.0, pcolor_end->red / 65535.0,
pcolor_end->green / 65535.0, pcolor_end->blue / 65535.0);
else
cairo_pattern_add_color_stop_rgb(pat, 1.0, pcolor->red / 65535.0,
pcolor->green / 65535.0, pcolor->blue / 65535.0);
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(DrawCtx *ctx, area_t geometry, float line_width, Bool filled, XColor 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_rgb(ctx->cr,
color.red / 65535.0,
color.green / 65535.0,
color.blue / 65535.0);
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 pattern__x pattern start x coord
* \param pattern_width pattern width
* \param color color to use at start
* \param pcolor_center color at 50% of width
* \param pcolor_end color at pattern_start + pattern_width
*/
void
draw_rectangle_gradient(DrawCtx *ctx, area_t geometry, float line_width, Bool filled,
area_t pattern_rect, XColor *pcolor,
XColor *pcolor_center, XColor *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, pattern_rect, 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(DrawCtx *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 x x-offset of widget
* \param y y-offset of widget
* \param w width in pixels
* \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 pcolor color at the left
* \param pcolor_center color in the center
* \param pcolor_end color at the right
*/
void
draw_graph(DrawCtx *ctx, area_t rect, int *from, int *to, int cur_index,
Position grow, area_t patt_rect,
XColor *pcolor, XColor *pcolor_center, XColor *pcolor_end)
{
int i, y, w;
float x;
cairo_pattern_t *pat;
pat = draw_setup_cairo_color_source(ctx, patt_rect,
pcolor, pcolor_center, pcolor_end);
/* middle of a pixel */
x = rect.x + 0.5;
y = rect.y;
w = rect.width;
i = -1;
if(grow == Right) /* draw from right to left */
{
x += w - 1;
while(++i < w)
{
cairo_move_to(ctx->cr, x, y - from[cur_index]);
cairo_line_to(ctx->cr, x, y - to[cur_index]);
x -= 1.0;
if (--cur_index < 0)
cur_index = w - 1;
}
}
else /* draw from left to right */
{
while(++i < w)
{
cairo_move_to(ctx->cr, x, y - from[cur_index]);
cairo_line_to(ctx->cr, x, y - to[cur_index]);
x += 1.0;
if (--cur_index < 0)
cur_index = w - 1;
}
}
cairo_stroke(ctx->cr);
if(pat)
cairo_pattern_destroy(pat);
}
/** Draw a line into a graph-widget
* \param ctx Draw context
* \param x x-offset of widget
* \param y y-offset of widget
* \param w width in pixels
* \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 pcolor color at the left
* \param pcolor_center color in the center
* \param pcolor_end color at the right
*/
void
draw_graph_line(DrawCtx *ctx, area_t rect, int *to, int cur_index,
Position grow, area_t patt_rect,
XColor *pcolor, XColor *pcolor_center, XColor *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, patt_rect, 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]);
cairo_stroke(ctx->cr);
if(pat)
cairo_pattern_destroy(pat);
/* reset line-width */
cairo_set_line_width(ctx->cr, 1.0);
}
/** Draw a circle
* \param ctx Draw context to draw to
* \param x x coordinate
* \param y y coordinate
* \param r size of the circle
* \param filled fill circle?
* \param color color to use
*/
void
draw_circle(DrawCtx *ctx, int x, int y, int r, Bool filled, XColor color)
{
cairo_set_line_width(ctx->cr, 1.0);
cairo_set_source_rgb(ctx->cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
cairo_new_sub_path(ctx->cr); /* don't draw from the old reference point to.. */
if(filled)
{
cairo_arc (ctx->cr, x + r, y + r, r, 0, 2 * M_PI);
cairo_fill(ctx->cr);
}
else
cairo_arc (ctx->cr, x + r, y + r, r - 1, 0, 2 * M_PI);
cairo_stroke(ctx->cr);
}
/** 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 wanted_h wanted height: if > 0, image will be resized
* \param data the image pixels array
*/
void draw_image_from_argb_data(DrawCtx *ctx, int x, int y, int w, int h,
int wanted_h, unsigned char *data)
{
double ratio;
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);
if(wanted_h > 0 && h > 0)
{
ratio = (double) wanted_h / (double) h;
cairo_scale(cr, ratio, ratio);
cairo_set_source_surface(cr, source, x / ratio, y / ratio);
}
else
cairo_set_source_surface(cr, source, x, y);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(source);
}
#ifdef HAVE_GTK
/** Draw an image (PNG format only) from a file to a draw context
* \param ctx Draw context to draw to
* \param x x coordinate
* \param y y coordinate
* \param wanted_h wanted height: if > 0, image will be resized
* \param filename file name to draw
*/
void
draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
{
double ratio;
int w, h;
cairo_t *cr;
GdkPixbuf *pixbuf;
GError *error=NULL;
if(!(pixbuf = gdk_pixbuf_new_from_file(filename,&error)))
return warn("cannot load image %s: %s\n", filename, error->message);
w = gdk_pixbuf_get_width(pixbuf);
h = gdk_pixbuf_get_height(pixbuf);
cr = cairo_create(ctx->surface);
if(wanted_h > 0 && h > 0)
{
ratio = (double) wanted_h / (double) h;
cairo_scale(cr, ratio, ratio);
gdk_cairo_set_source_pixbuf(cr, pixbuf, x/ratio, y/ratio);
}
else
gdk_cairo_set_source_pixbuf(cr, pixbuf, (double) x, (double) y);
cairo_paint(cr);
gdk_pixbuf_unref(pixbuf);
cairo_destroy(cr);
}
/** get an image size
* \param filename file name
* \return area_t structure with width and height set to image size
*/
area_t
draw_get_image_size(const char *filename)
{
area_t size = { -1, -1, -1, -1, NULL, NULL };
gint width, height;
if(gdk_pixbuf_get_file_info(filename, &width, &height))
{
size.width = width;
size.height = height;
}
else
warn("cannot load image %s: %s\n", filename, "format unrecognized");
return size;
}
#else /* HAVE_GTK */
static const char *
draw_imlib_load_strerror(Imlib_Load_Error e)
{
switch(e)
{
case IMLIB_LOAD_ERROR_FILE_DOES_NOT_EXIST:
return "no such file or directory";
case IMLIB_LOAD_ERROR_FILE_IS_DIRECTORY:
return "file is a directory";
case IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_READ:
return "read permission denied";
case IMLIB_LOAD_ERROR_NO_LOADER_FOR_FILE_FORMAT:
return "no loader for file format";
case IMLIB_LOAD_ERROR_PATH_TOO_LONG:
return "path too long";
case IMLIB_LOAD_ERROR_PATH_COMPONENT_NON_EXISTANT:
return "path component non existant";
case IMLIB_LOAD_ERROR_PATH_COMPONENT_NOT_DIRECTORY:
return "path compoment not a directory";
case IMLIB_LOAD_ERROR_PATH_POINTS_OUTSIDE_ADDRESS_SPACE:
return "path points oustide address space";
case IMLIB_LOAD_ERROR_TOO_MANY_SYMBOLIC_LINKS:
return "too many symbolic links";
case IMLIB_LOAD_ERROR_OUT_OF_MEMORY:
return "out of memory";
case IMLIB_LOAD_ERROR_OUT_OF_FILE_DESCRIPTORS:
return "out of file descriptors";
case IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_WRITE:
return "write permission denied";
case IMLIB_LOAD_ERROR_OUT_OF_DISK_SPACE:
return "out of disk space";
case IMLIB_LOAD_ERROR_UNKNOWN:
return "unknown error, that's really bad";
case IMLIB_LOAD_ERROR_NONE:
return "no error, oops";
}
return "unknown error";
}
/** Draw an image (PNG format only) from a file to a draw context
* \param ctx Draw context to draw to
* \param x x coordinate
* \param y y coordinate
* \param wanted_h wanted height: if > 0, image will be resized
* \param filename file name to draw
*/
void
draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
{
int w, h, size, i;
DATA32 *data;
double alpha;
unsigned char *dataimg, *rdataimg;
Imlib_Image image;
Imlib_Load_Error e = IMLIB_LOAD_ERROR_NONE;
if(!(image = imlib_load_image_with_error_return(filename, &e)))
return warn("cannot load image %s: %s\n", filename, draw_imlib_load_strerror(e));
imlib_context_set_image(image);
h = imlib_image_get_height();
w = imlib_image_get_width();
size = w * h;
data = imlib_image_get_data_for_reading_only();
rdataimg = dataimg = p_new(unsigned char, size * 4);
for(i = 0; i < size; i++, dataimg += 4)
{
dataimg[3] = (data[i] >> 24) & 0xff; /* A */
/* cairo wants pre-multiplied alpha */
alpha = dataimg[3] / 255.0;
dataimg[2] = ((data[i] >> 16) & 0xff) * alpha; /* R */
dataimg[1] = ((data[i] >> 8) & 0xff) * alpha; /* G */
dataimg[0] = (data[i] & 0xff) * alpha; /* B */
}
draw_image_from_argb_data(ctx, x, y, w, h, wanted_h, rdataimg);
imlib_free_image();
p_delete(&rdataimg);
}
/** Get an image size
* \param filename file name
* \return area_t structure with width and height set to image size
*/
area_t
draw_get_image_size(const char *filename)
{
area_t size = { -1, -1, -1, -1, NULL, NULL };
Imlib_Image image;
Imlib_Load_Error e = IMLIB_LOAD_ERROR_NONE;
if((image = imlib_load_image_with_error_return(filename, &e)))
{
imlib_context_set_image(image);
size.width = imlib_image_get_width();
size.height = imlib_image_get_height();
imlib_free_image();
}
else
warn("cannot load image %s: %s\n", filename, draw_imlib_load_strerror(e));
return size;
}
#endif /* HAVE_GTK */
/** Rotate a drawable
* \param ctx Draw context to draw to
* \param dest Drawable to draw the result
* \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
* \return new rotated drawable
*/
void
draw_rotate(DrawCtx *ctx, Drawable dest, int dest_w, int dest_h,
double angle, int tx, int ty)
{
cairo_surface_t *surface, *source;
cairo_t *cr;
surface = cairo_xlib_surface_create(ctx->display, dest,
ctx->visual, dest_w, dest_h);
source = cairo_xlib_surface_create(ctx->display, ctx->drawable,
ctx->visual, ctx->width, ctx->height);
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 of a text in pixel
* \param disp Display ref
* \param font font to use
* \param text the text
* \return text width
*/
unsigned short
draw_textwidth(Display *disp, font_t *font, const char *text)
{
cairo_surface_t *surface;
cairo_t *cr;
PangoLayout *layout;
PangoRectangle ext;
if(!a_strlen(text))
return 0;
surface = cairo_xlib_surface_create(disp, DefaultScreen(disp),
DefaultVisual(disp, DefaultScreen(disp)),
DisplayWidth(disp, DefaultScreen(disp)),
DisplayHeight(disp, DefaultScreen(disp)));
cr = cairo_create(surface);
layout = pango_cairo_create_layout(cr);
pango_layout_set_text(layout, text, -1);
pango_layout_set_font_description(layout, font->desc);
pango_layout_get_pixel_extents(layout, NULL, &ext);
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return ext.width;
}
/** Transform a string to a Alignment type.
* Recognized string are left, center or right. Everything else will be
* recognized as AlignAuto.
* \param align string with align text
* \return Alignment type
*/
Alignment
draw_align_get_from_str(const char *align)
{
if(!a_strcmp(align, "left"))
return AlignLeft;
else if(!a_strcmp(align, "center"))
return AlignCenter;
else if(!a_strcmp(align, "right"))
return AlignRight;
else if(!a_strcmp(align, "flex"))
return AlignFlex;
return AlignAuto;
}
/** Initialize an X color
* \param disp display ref
* \param phys_screen Physical screen number
* \param colstr Color specification
* \param color XColor struct to store color to
* \return true if color allocation was successfull
*/
Bool
draw_color_new(Display *disp, int phys_screen, const char *colstr, XColor *color)
{
Bool ret;
XColor exactColor;
if(!a_strlen(colstr))
return False;
if(!(ret = XAllocNamedColor(disp,
DefaultColormap(disp, phys_screen),
colstr,
color,
&exactColor)))
warn("awesome: error, cannot allocate color '%s'\n", colstr);
return ret;
}
/** Init a style struct. Every value will be inherited from m
* if they are not set in the configuration section cfg.
* \param disp Display ref
* \param phys_screen Physical screen number
* \param cfg style configuration section
* \param c style to fill
* \param m style to use as template
*/
void
draw_style_init(Display *disp, int phys_screen, cfg_t *cfg,
style_t *c, style_t *m)
{
char *buf;
int shadow;
if(m)
*c = *m;
if(!cfg)
return;
if((buf = cfg_getstr(cfg, "font")))
c->font = draw_font_new(disp, buf);
draw_color_new(disp, phys_screen,
cfg_getstr(cfg, "fg"), &c->fg);
draw_color_new(disp, phys_screen,
cfg_getstr(cfg, "bg"), &c->bg);
draw_color_new(disp, phys_screen,
cfg_getstr(cfg, "border"), &c->border);
draw_color_new(disp, phys_screen,
cfg_getstr(cfg, "shadow"), &c->shadow);
if((shadow = cfg_getint(cfg, "shadow_offset")) != (int) 0xffffffff)
c->shadow_offset = shadow;
else if(!m)
c->shadow_offset = 0;
}
/** Remove a area from a list of them,
* spliting the space between several area that can overlap
* \param head list head
* \param elem area to remove
*/
void
area_list_remove(area_t **head, area_t *elem)
{
area_t *r, inter, *extra, *rnext;
for(r = *head; r; r = rnext)
{
rnext = r->next;
if(area_intersect_area(*r, *elem))
{
/* remove it from the list */
area_list_detach(head, r);
inter = area_get_intersect_area(*r, *elem);
if(AREA_LEFT(inter) > AREA_LEFT(*r))
{
extra = p_new(area_t, 1);
extra->x = r->x;
extra->y = r->y;
extra->width = AREA_LEFT(inter) - r->x;
extra->height = r->height;
area_list_append(head, extra);
}
if(AREA_TOP(inter) > AREA_TOP(*r))
{
extra = p_new(area_t, 1);
extra->x = r->x;
extra->y = r->y;
extra->width = r->width;
extra->height = AREA_TOP(inter) - r->y;
area_list_append(head, extra);
}
if(AREA_RIGHT(inter) < AREA_RIGHT(*r))
{
extra = p_new(area_t, 1);
extra->x = AREA_RIGHT(inter);
extra->y = r->y;
extra->width = AREA_RIGHT(*r) - AREA_RIGHT(inter);
extra->height = r->height;
area_list_append(head, extra);
}
if(AREA_BOTTOM(inter) < AREA_BOTTOM(*r))
{
extra = p_new(area_t, 1);
extra->x = r->x;
extra->y = AREA_BOTTOM(inter);
extra->width = r->width;
extra->height = AREA_BOTTOM(*r) - AREA_BOTTOM(inter);
area_list_append(head, extra);
}
/* delete the elem since we removed it from the list */
p_delete(&r);
}
}
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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