/* * draw.c - draw functions * * Copyright © 2007-2008 Julien Danjou * * 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 #include "config.h" #include #include #include #include #include #include "structs.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); } if(dlen) *dlen = orig_utf8len - utf8len; return true; } static xcb_visualtype_t * draw_screen_default_visual(xcb_screen_t *s) { if(!s) return NULL; xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(s); if(depth_iter.data) for(; depth_iter.rem; xcb_depth_next (&depth_iter)) for(xcb_visualtype_iterator_t visual_iter = xcb_depth_visuals_iterator (depth_iter.data); visual_iter.rem; xcb_visualtype_next (&visual_iter)) if(s->root_visual == visual_iter.data->visual_id) return visual_iter.data; return NULL; } /** 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); xcb_visualtype_t *visual = draw_screen_default_visual(s); if(!visual) fatal("cannot get visual"); /* 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, 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(!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) { xcb_screen_t *s = xutil_screen_get(globalconf.connection, phys_screen); d->phys_screen = phys_screen; d->width = width; d->height = height; d->depth = s->root_depth; d->visual = draw_screen_default_visual(s); d->pixmap = px; d->surface = cairo_xcb_surface_create(globalconf.connection, px, d->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 elip 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; /* + 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 - ext->height + 1) / 2 + 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]); 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->width, image->height, ratio, image->data); } /** 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, ctx->visual, dest_w, dest_h); source = cairo_xcb_surface_create(globalconf.connection, src, ctx->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; xcb_visualtype_t *visual = draw_screen_default_visual(s); if(!visual) fatal("no visual found"); surface = cairo_xcb_surface_create(globalconf.connection, globalconf.default_screen, 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. * Everything else will be recognized as AlignLeft. * \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_FLEX: return AlignFlex; case A_TK_FIXED: return AlignFixed; 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 AlignFlex: return "flex"; case AlignFixed: return "fixed"; 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