/* gtktextdisplay.c - display layed-out text * * Copyright (c) 1992-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 2000 Red Hat, Inc. * Tk->Gtk port by Havoc Pennington * * This file can be used under your choice of two licenses, the LGPL * and the original Tk license. * * LGPL: * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Original Tk license: * * This software is copyrighted by the Regents of the University of * California, Sun Microsystems, Inc., and other parties. The * following terms apply to all files associated with the software * unless explicitly disclaimed in individual files. * * The authors hereby grant permission to use, copy, modify, * distribute, and license this software and its documentation for any * purpose, provided that existing copyright notices are retained in * all copies and that this notice is included verbatim in any * distributions. No written agreement, license, or royalty fee is * required for any of the authorized uses. Modifications to this * software may be copyrighted by their authors and need not follow * the licensing terms described here, provided that the new terms are * clearly indicated on the first page of each file where they apply. * * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * GOVERNMENT USE: If you are acquiring this software on behalf of the * U.S. government, the Government shall have only "Restricted Rights" * in the software and related documentation as defined in the Federal * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you * are acquiring the software on behalf of the Department of Defense, * the software shall be classified as "Commercial Computer Software" * and the Government shall have only "Restricted Rights" as defined * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the * foregoing, the authors grant the U.S. Government and others acting * in its behalf permission to use and distribute the software in * accordance with the terms specified in this license. * */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "gtktextdisplay.h" #include "gtktextiterprivate.h" #include typedef struct _GtkTextRenderState GtkTextRenderState; struct _GtkTextRenderState { GtkWidget *widget; GtkTextAppearance *last_appearance; GdkGC *fg_gc; GdkGC *bg_gc; GdkRectangle clip_rect; }; static void get_item_properties (PangoItem *item, GtkTextAppearance **appearance); static GdkRegion *get_selected_clip (GtkTextRenderState *render_state, PangoLayout *layout, PangoLayoutLine *line, int x, int y, int height, int start_index, int end_index); static GtkTextRenderState * gtk_text_render_state_new (GtkWidget *widget, GdkDrawable *drawable, GdkRectangle *clip_rect) { GtkTextRenderState *state = g_new0 (GtkTextRenderState, 1); state->widget = widget; state->fg_gc = gdk_gc_new (drawable); state->bg_gc = gdk_gc_new (drawable); state->clip_rect = *clip_rect; return state; } static void gtk_text_render_state_destroy (GtkTextRenderState *state) { gdk_gc_unref (state->fg_gc); gdk_gc_unref (state->bg_gc); g_free (state); } static void gtk_text_render_state_set_color (GtkTextRenderState *state, GdkGC *gc, GdkColor *color) { gdk_colormap_alloc_color (gtk_widget_get_colormap (state->widget), color, FALSE, TRUE); gdk_gc_set_foreground (gc, color); } static void gtk_text_render_state_update (GtkTextRenderState *state, GtkTextAppearance *new_appearance) { if (!state->last_appearance || !gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color)) gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color); if (!state->last_appearance || new_appearance->fg_stipple != state->last_appearance->fg_stipple) { if (new_appearance->fg_stipple) { gdk_gc_set_fill(state->fg_gc, GDK_STIPPLED); gdk_gc_set_stipple(state->fg_gc, new_appearance->fg_stipple); } else { gdk_gc_set_fill(state->fg_gc, GDK_SOLID); } } if (new_appearance->draw_bg) { if (!state->last_appearance || !gdk_color_equal (&new_appearance->bg_color, &state->last_appearance->bg_color)) gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color); if (!state->last_appearance || new_appearance->bg_stipple != state->last_appearance->bg_stipple) { if (new_appearance->bg_stipple) { gdk_gc_set_fill(state->bg_gc, GDK_STIPPLED); gdk_gc_set_stipple(state->bg_gc, new_appearance->bg_stipple); } else { gdk_gc_set_fill(state->bg_gc, GDK_SOLID); } } } state->last_appearance = new_appearance; } static void render_layout_line (GdkDrawable *drawable, GtkTextRenderState *render_state, PangoLayoutLine *line, GSList **pixbuf_pointer, int x, int y, gboolean selected) { GSList *tmp_list = line->runs; PangoRectangle overall_rect; PangoRectangle logical_rect; PangoRectangle ink_rect; gint x_off = 0; pango_layout_line_get_extents (line, NULL, &overall_rect); while (tmp_list) { PangoLayoutRun *run = tmp_list->data; GtkTextAppearance *appearance; tmp_list = tmp_list->next; get_item_properties (run->item, &appearance); if (appearance) /* A text segment */ { GdkGC *fg_gc; if (selected) { fg_gc = render_state->widget->style->fg_gc[GTK_STATE_SELECTED]; } else { gtk_text_render_state_update (render_state, appearance); fg_gc = render_state->fg_gc; } if (appearance->underline == PANGO_UNDERLINE_NONE && !appearance->strikethrough) pango_glyph_string_extents (run->glyphs, run->item->analysis.font, NULL, &logical_rect); else pango_glyph_string_extents (run->glyphs, run->item->analysis.font, &ink_rect, &logical_rect); if (appearance->draw_bg && !selected) gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE, x + (x_off + logical_rect.x) / PANGO_SCALE, y + logical_rect.y / PANGO_SCALE, logical_rect.width / PANGO_SCALE, logical_rect.height / PANGO_SCALE); gdk_draw_glyphs (drawable, fg_gc, run->item->analysis.font, x + x_off / PANGO_SCALE, y, run->glyphs); switch (appearance->underline) { case PANGO_UNDERLINE_NONE: break; case PANGO_UNDERLINE_DOUBLE: gdk_draw_line (drawable, fg_gc, x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 4, x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 4); /* Fall through */ case PANGO_UNDERLINE_SINGLE: gdk_draw_line (drawable, fg_gc, x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 2, x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 2); break; case PANGO_UNDERLINE_LOW: gdk_draw_line (drawable, fg_gc, x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2, x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2); break; } if (appearance->strikethrough) { gint strikethrough_y = y + (0.3 * logical_rect.y) / PANGO_SCALE; gdk_draw_line (drawable, fg_gc, x + (x_off + ink_rect.x) / PANGO_SCALE - 1, strikethrough_y, x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, strikethrough_y); } x_off += logical_rect.width; } else /* Pixbuf segment */ { GtkTextPixbuf *pixbuf = (*pixbuf_pointer)->data; gint width, height; GdkRectangle pixbuf_rect, draw_rect; GdkBitmap *mask = NULL; *pixbuf_pointer = (*pixbuf_pointer)->next; width = gdk_pixbuf_get_width (pixbuf->pixbuf); height = gdk_pixbuf_get_height (pixbuf->pixbuf); pixbuf_rect.x = x + x_off / PANGO_SCALE; pixbuf_rect.y = y - height; pixbuf_rect.width = width; pixbuf_rect.height = height; if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect, &draw_rect)) { if (gdk_pixbuf_get_has_alpha (pixbuf->pixbuf)) { mask = gdk_pixmap_new (drawable, gdk_pixbuf_get_width (pixbuf->pixbuf), gdk_pixbuf_get_height (pixbuf->pixbuf), 1); gdk_pixbuf_render_threshold_alpha (pixbuf->pixbuf, mask, 0, 0, 0, 0, gdk_pixbuf_get_width (pixbuf->pixbuf), gdk_pixbuf_get_height (pixbuf->pixbuf), 128); } if (mask) { gdk_gc_set_clip_mask (render_state->fg_gc, mask); gdk_gc_set_clip_origin (render_state->fg_gc, pixbuf_rect.x, pixbuf_rect.y); } gdk_pixbuf_render_to_drawable (pixbuf->pixbuf, drawable, render_state->fg_gc, draw_rect.x - pixbuf_rect.x, draw_rect.y - pixbuf_rect.y, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height, GDK_RGB_DITHER_NORMAL, 0, 0); if (mask) { gdk_gc_set_clip_rectangle (render_state->fg_gc, &render_state->clip_rect); g_object_unref (G_OBJECT (mask)); } } x_off += width * PANGO_SCALE; } } } static void render_para (GdkDrawable *drawable, GtkTextRenderState *render_state, GtkTextLineDisplay *line_display, int x, int y, int selection_start_index, int selection_end_index) { PangoRectangle logical_rect; GSList *pixbuf_pointer = line_display->pixbufs; GSList *tmp_list; PangoAlignment align; PangoLayout *layout = line_display->layout; int indent; int total_width; int y_offset = 0; int byte_offset = 0; gboolean first = TRUE; indent = pango_layout_get_indent (layout); total_width = pango_layout_get_width (layout); align = pango_layout_get_alignment (layout); if (total_width < 0) total_width = line_display->total_width * PANGO_SCALE; tmp_list = pango_layout_get_lines (layout); while (tmp_list) { PangoLayoutLine *line = tmp_list->data; int x_offset; int selection_y, selection_height; pango_layout_line_get_extents (line, NULL, &logical_rect); x_offset = line_display->left_margin * PANGO_SCALE; switch (align) { case PANGO_ALIGN_RIGHT: x_offset += total_width - logical_rect.width; break; case PANGO_ALIGN_CENTER: x_offset += (total_width - logical_rect.width) / 2; break; default: break; } if (first) { if (indent > 0) { if (align == PANGO_ALIGN_LEFT) x_offset += indent; else x_offset -= indent; } } else { if (indent < 0) { if (align == PANGO_ALIGN_LEFT) x_offset -= indent; else x_offset += indent; } } selection_y = y + y_offset / PANGO_SCALE; selection_height = logical_rect.height / PANGO_SCALE; if (first) { selection_y -= line_display->top_margin; selection_height += line_display->top_margin; } if (!tmp_list->next) selection_height += line_display->bottom_margin; first = FALSE; if (selection_start_index < byte_offset && selection_end_index > line->length + byte_offset) /* All selected */ { gdk_draw_rectangle (drawable, render_state->widget->style->bg_gc[GTK_STATE_SELECTED], TRUE, x + line_display->left_margin, selection_y, total_width / PANGO_SCALE, selection_height); render_layout_line (drawable, render_state, line, &pixbuf_pointer, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, TRUE); } else { GSList *pixbuf_pointer_tmp = pixbuf_pointer; render_layout_line (drawable, render_state, line, &pixbuf_pointer, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, FALSE); if (selection_start_index < byte_offset + line->length && selection_end_index > byte_offset) /* Some selected */ { GdkRegion *clip_region = get_selected_clip (render_state, layout, line, x + line_display->x_offset, selection_y, selection_height, selection_start_index, selection_end_index); gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], clip_region); gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], clip_region); gdk_draw_rectangle (drawable, render_state->widget->style->bg_gc[GTK_STATE_SELECTED], TRUE, x + x_offset / PANGO_SCALE, selection_y, logical_rect.width / PANGO_SCALE, selection_height); render_layout_line (drawable, render_state, line, &pixbuf_pointer_tmp, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, TRUE); gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], NULL); gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], NULL); gdk_region_destroy (clip_region); /* Paint in the ends of the line */ if (x_offset > line_display->left_margin * PANGO_SCALE && ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) || (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length))) { gdk_draw_rectangle (drawable, render_state->widget->style->bg_gc[GTK_STATE_SELECTED], TRUE, x + line_display->left_margin, selection_y, x + x_offset / PANGO_SCALE - line_display->left_margin, selection_height); } if (x_offset + logical_rect.width < line_display->left_margin * PANGO_SCALE + total_width && ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) || (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset))) { gdk_draw_rectangle (drawable, render_state->widget->style->bg_gc[GTK_STATE_SELECTED], TRUE, x + (x_offset + logical_rect.width) / PANGO_SCALE, selection_y, x + (line_display->left_margin * PANGO_SCALE + total_width - x_offset - logical_rect.width) / PANGO_SCALE, selection_height); } } } byte_offset += line->length; y_offset += logical_rect.height; tmp_list = tmp_list->next; } } static GdkRegion * get_selected_clip (GtkTextRenderState *render_state, PangoLayout *layout, PangoLayoutLine *line, int x, int y, int height, int start_index, int end_index) { gint *ranges; gint n_ranges, i; GdkRegion *clip_region = gdk_region_new (); GdkRegion *tmp_region; PangoRectangle logical_rect; pango_layout_line_get_extents (line, NULL, &logical_rect); pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges); for (i=0; i < n_ranges; i++) { GdkRectangle rect; rect.x = x + ranges[2*i] / PANGO_SCALE; rect.y = y; rect.width = (ranges[2*i + 1] - ranges[2*i]) / PANGO_SCALE; rect.height = height; gdk_region_union_with_rect (clip_region, &rect); } tmp_region = gdk_region_rectangle (&render_state->clip_rect); gdk_region_intersect (clip_region, tmp_region); gdk_region_destroy (tmp_region); g_free (ranges); return clip_region; } static void get_item_properties (PangoItem *item, GtkTextAppearance **appearance) { GSList *tmp_list = item->extra_attrs; *appearance = NULL; while (tmp_list) { PangoAttribute *attr = tmp_list->data; if (attr->klass->type == gtk_text_attr_appearance_type) { *appearance = &((GtkTextAttrAppearance *)attr)->appearance; } tmp_list = tmp_list->next; } } void gtk_text_layout_draw (GtkTextLayout *layout, GtkWidget *widget, GdkDrawable *drawable, /* Location of the layout in buffer coordinates */ gint x_offset, gint y_offset, /* Region of the layout to render */ gint x, gint y, gint width, gint height) { GdkRectangle clip; gint current_y; GSList *line_list; GSList *tmp_list; GSList *cursor_list; GtkTextRenderState *render_state; GtkTextIter selection_start, selection_end; gboolean have_selection = FALSE; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (layout->default_style != NULL); g_return_if_fail (layout->buffer != NULL); g_return_if_fail (drawable != NULL); g_return_if_fail (x_offset >= 0); g_return_if_fail (y_offset >= 0); g_return_if_fail (width >= 0); g_return_if_fail (height >= 0); if (width == 0 || height == 0) return; line_list = gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, ¤t_y); current_y -= y_offset; if (line_list == NULL) return; /* nothing on the screen */ clip.x = x; clip.y = y; clip.width = width; clip.height = height; render_state = gtk_text_render_state_new (widget, drawable, &clip); gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip); gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip); gtk_text_layout_wrap_loop_start (layout); if (gtk_text_buffer_get_selection_bounds (layout->buffer, &selection_start, &selection_end)) have_selection = TRUE; tmp_list = line_list; while (tmp_list != NULL) { GtkTextLineDisplay *line_display; gint selection_start_index = -1; gint selection_end_index = -1; GtkTextLine *line = tmp_list->data; line_display = gtk_text_layout_get_line_display (layout, line, FALSE); if (have_selection) { GtkTextIter line_start, line_end; gint byte_count = gtk_text_line_byte_count (line); gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), &line_start, line, 0); gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), &line_end, line, byte_count - 1); if (gtk_text_iter_compare (&selection_start, &line_end) < 0 && gtk_text_iter_compare (&selection_end, &line_start) > 0) { if (gtk_text_iter_compare (&selection_start, &line_start) >= 0) selection_start_index = gtk_text_iter_get_line_index (&selection_start); else selection_start_index = -1; if (gtk_text_iter_compare (&selection_end, &line_end) <= 0) selection_end_index = gtk_text_iter_get_line_index (&selection_end); else selection_end_index = byte_count; } } render_para (drawable, render_state, line_display, - x_offset, current_y + line_display->top_margin, selection_start_index, selection_end_index); /* We paint the cursors last, because they overlap another chunk and need to appear on top. */ cursor_list = line_display->cursors; while (cursor_list) { GtkTextCursorDisplay *cursor = cursor_list->data; GdkGC *gc; if (cursor->is_strong) gc = widget->style->bg_gc[GTK_STATE_SELECTED]; else gc = widget->style->fg_gc[GTK_STATE_NORMAL]; gdk_draw_line (drawable, gc, line_display->x_offset + cursor->x, current_y + line_display->top_margin + cursor->y, line_display->x_offset + cursor->x, current_y + line_display->top_margin + cursor->y + cursor->height); cursor_list = cursor_list->next; } current_y += line_display->height; gtk_text_layout_free_line_display (layout, line_display); tmp_list = g_slist_next (tmp_list); } gtk_text_layout_wrap_loop_end (layout); gtk_text_render_state_destroy (render_state); g_slist_free (line_list); }