411 lines
12 KiB
C
411 lines
12 KiB
C
/*
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* draw.c - draw functions
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*
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* Copyright © 2007-2008 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.h>
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#include <cairo-ft.h>
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#include <cairo-xlib.h>
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#include <math.h>
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#include "draw.h"
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#include "common/util.h"
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/** Get a draw context
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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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* \return draw context ref
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*/
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DrawCtx *
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draw_get_context(Display *disp, int phys_screen, int width, int height, Drawable dw)
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{
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DrawCtx *d = p_new(DrawCtx, 1);
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d->display = disp;
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d->phys_screen = phys_screen;
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d->width = width;
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d->height = height;
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d->depth = DefaultDepth(disp, phys_screen);
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d->visual = DefaultVisual(disp, phys_screen);
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d->drawable = dw;
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return d;
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};
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/** Draw text into a draw context
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* \param x x coord
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* \param y y coord
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* \param w width
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* \param h height
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* \param align alignment
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* \param padding padding to add before drawing the text
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* \param font font to use
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* \param text text to draw
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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_text(DrawCtx *ctx,
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Area area,
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Alignment align,
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int padding,
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XftFont *font, const char *text,
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XColor fg, XColor bg)
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{
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int nw = 0;
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static char buf[256];
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size_t len, olen;
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cairo_font_face_t *font_face;
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cairo_surface_t *surface;
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cairo_t *cr;
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draw_rectangle(ctx, area, True, bg);
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olen = len = a_strlen(text);
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if(!len)
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return;
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surface = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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cr = cairo_create(surface);
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font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
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cairo_set_font_face(cr, font_face);
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cairo_set_font_size(cr, font->height);
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cairo_set_source_rgb(cr, fg.red / 65535.0, fg.green / 65535.0, fg.blue / 65535.0);
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if(len >= sizeof(buf))
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len = sizeof(buf) - 1;
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memcpy(buf, text, len);
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buf[len] = 0;
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while(len && (nw = (draw_textwidth(ctx->display, font, buf)) + padding * 2) > area.width)
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buf[--len] = 0;
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if(nw > area.width)
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return; /* too long */
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if(len < olen)
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{
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if(len > 1)
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buf[len - 1] = '.';
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if(len > 2)
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buf[len - 2] = '.';
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if(len > 3)
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buf[len - 3] = '.';
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}
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switch(align)
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{
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case AlignLeft:
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cairo_move_to(cr, area.x + padding, area.y + font->ascent + (ctx->height - font->height) / 2);
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break;
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case AlignRight:
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cairo_move_to(cr, area.x + (area.width - nw) + padding,
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area.y + font->ascent + (ctx->height - font->height) / 2);
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break;
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default:
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cairo_move_to(cr, area.x + ((area.width - nw) / 2) + padding,
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area.y + font->ascent + (ctx->height - font->height) / 2);
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break;
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}
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cairo_show_text(cr, buf);
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cairo_font_face_destroy(font_face);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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}
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/** Draw rectangle
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* \param ctx Draw context
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* \param geometry geometry
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* \param filled filled 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(DrawCtx *ctx, Area geometry, Bool filled, XColor color)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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surface = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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cr = cairo_create (surface);
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cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
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cairo_set_line_width(cr, 1.0);
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cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
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if(filled)
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{
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cairo_rectangle(cr, geometry.x, geometry.y, geometry.width, geometry.height);
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cairo_fill(cr);
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}
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else
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cairo_rectangle(cr, geometry.x + 1, geometry.y, geometry.width - 1, geometry.height - 1);
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cairo_stroke(cr);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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}
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/* draw_graph functions */
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void
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draw_graph_init(DrawCtx *ctx, cairo_surface_t **pp_surface, cairo_t **pp_cr)
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{
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*pp_surface = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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*pp_cr = cairo_create (*pp_surface);
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cairo_set_antialias(*pp_cr, CAIRO_ANTIALIAS_NONE);
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cairo_set_line_width(*pp_cr, 1.0);
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/* without it, it can draw over the path on sharp angles (...too long lines) */
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cairo_set_line_join (*pp_cr, CAIRO_LINE_JOIN_ROUND);
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}
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void
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draw_graph_end(cairo_surface_t *surface, cairo_t *cr)
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{
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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}
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/* draws a graph; it takes the line-lengths from *from and *to. It cycles
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* backwards through those arrays (what have the length of w), beginning at
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* position cur_index, until cur_index is reached again (wrapped around). */
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void
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draw_graph(cairo_t *cr, int x, int y, int w, int *from, int *to, int cur_index, XColor color)
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{
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int i;
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cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
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i = -1;
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while(++i < w)
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{
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cairo_move_to(cr, x, y - from[cur_index]);
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cairo_line_to(cr, x, y - to[cur_index]);
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x++;
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if (--cur_index < 0)
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cur_index = w - 1;
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}
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cairo_stroke(cr);
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}
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void
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draw_graph_line(cairo_t *cr, int x, int y, int w, int *to, int cur_index, XColor color)
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{
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int i;
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int flag = 0; /* used to prevent drawing a line from 0 to 0 values */
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cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
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/* x-1 (on the border), paints *from* the last point (... not included itself) */
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/* makes sense when you assume there is already some line drawn to it. */
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cairo_move_to(cr, x - 1, y - to[cur_index]);
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for (i = 0; i < w; i++)
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{
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if (to[cur_index] > 0)
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{
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cairo_line_to(cr, x, y - to[cur_index]);
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flag = 1;
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}
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else
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{
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if(flag) /* only draw from values > 0 to 0-values */
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{
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cairo_line_to(cr, x, y);
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flag = 0;
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}
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else
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cairo_move_to(cr, x, y);
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}
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if (--cur_index < 0) /* cycles around the index */
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cur_index = w - 1;
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x++;
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}
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cairo_stroke(cr);
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}
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void
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draw_circle(DrawCtx *ctx, int x, int y, int r, Bool filled, XColor color)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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surface = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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cr = cairo_create (surface);
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cairo_set_line_width(cr, 1.0);
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cairo_set_source_rgb(cr, color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0);
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if(filled)
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{
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cairo_arc (cr, x + r, y + r, r, 0, 2 * M_PI);
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cairo_fill(cr);
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}
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else
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cairo_arc (cr, x + r, y + r, r - 1, 0, 2 * M_PI);
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cairo_stroke(cr);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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}
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void draw_image_from_argb_data(DrawCtx *ctx, int x, int y, int w, int h,
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int wanted_h, unsigned char *data)
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{
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double ratio;
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cairo_surface_t *surface, *source;
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cairo_t *cr;
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surface = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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source = cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, w, h, 0);
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cr = cairo_create (surface);
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if(wanted_h > 0 && h > 0)
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{
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ratio = (double) wanted_h / (double) h;
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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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}
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else
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cairo_set_source_surface(cr, source, x, y);
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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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void
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draw_image(DrawCtx *ctx, int x, int y, int wanted_h, const char *filename)
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{
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double ratio;
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int h;
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cairo_surface_t *surface, *source;
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cairo_t *cr;
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cairo_status_t cairo_st;
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source = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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surface = cairo_image_surface_create_from_png(filename);
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if((cairo_st = cairo_surface_status(surface)))
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{
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warn("failed to draw image %s: %s\n", filename, cairo_status_to_string(cairo_st));
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return;
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}
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cr = cairo_create (source);
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if(wanted_h > 0 && (h = cairo_image_surface_get_height(surface)) > 0)
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{
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ratio = (double) wanted_h / (double) h;
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cairo_scale(cr, ratio, ratio);
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cairo_set_source_surface(cr, surface, x / ratio, y / ratio);
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}
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else
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cairo_set_source_surface(cr, surface, x, y);
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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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Area
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draw_get_image_size(const char *filename)
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{
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Area size = { -1, -1, -1, -1 };
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cairo_surface_t *surface;
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cairo_status_t cairo_st;
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surface = cairo_image_surface_create_from_png(filename);
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if((cairo_st = cairo_surface_status(surface)))
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warn("failed to get image size %s: %s\n", filename, cairo_status_to_string(cairo_st));
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else
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{
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cairo_image_surface_get_width(surface);
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size.x = 0;
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size.y = 0;
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size.width = cairo_image_surface_get_width(surface);
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size.height = cairo_image_surface_get_height(surface);
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cairo_surface_destroy(surface);
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}
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return size;
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}
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Drawable
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draw_rotate(DrawCtx *ctx, int screen, 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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Drawable newdrawable;
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newdrawable = XCreatePixmap(ctx->display,
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RootWindow(ctx->display, screen),
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ctx->height, ctx->width,
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ctx->depth);
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surface = cairo_xlib_surface_create(ctx->display, newdrawable, ctx->visual, ctx->height, ctx->width);
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source = cairo_xlib_surface_create(ctx->display, ctx->drawable, ctx->visual, ctx->width, ctx->height);
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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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return newdrawable;
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}
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unsigned short
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draw_textwidth(Display *disp, XftFont *font, char *text)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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cairo_font_face_t *font_face;
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cairo_text_extents_t te;
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if (!a_strlen(text))
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return 0;
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surface = cairo_xlib_surface_create(disp, DefaultScreen(disp),
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DefaultVisual(disp, DefaultScreen(disp)),
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DisplayWidth(disp, DefaultScreen(disp)),
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DisplayHeight(disp, DefaultScreen(disp)));
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cr = cairo_create(surface);
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font_face = cairo_ft_font_face_create_for_pattern(font->pattern);
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cairo_set_font_face(cr, font_face);
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cairo_set_font_size(cr, font->height);
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cairo_text_extents(cr, text, &te);
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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cairo_font_face_destroy(font_face);
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return MAX(te.x_advance, te.width);
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}
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Alignment
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draw_get_align(const char *align)
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{
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if(!a_strncmp(align, "center", 6))
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return AlignCenter;
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else if(!a_strncmp(align, "right", 5))
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return AlignRight;
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return AlignLeft;
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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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