1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 2000 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
22 #include <pango/pangocairo.h>
26 #include "gdkinternals.h"
29 #include "gdkprivate.h"
30 #include "gdkscreen.h"
33 /* This is for P_() ... a bit non-kosher, but works fine */
34 #include "gtk/gtkintl.h"
36 #define GDK_INFO_KEY "gdk-info"
38 /* We have various arrays indexed by render part; if PangoRenderPart
39 * is extended, we want to make sure not to overwrite the end of
42 #define MAX_RENDER_PART PANGO_RENDER_PART_STRIKETHROUGH
44 struct _GdkPangoRendererPrivate
48 /* GdkPangoRenderer specific state */
49 PangoColor override_color[MAX_RENDER_PART + 1];
50 gboolean override_color_set[MAX_RENDER_PART + 1];
52 GdkBitmap *stipple[MAX_RENDER_PART + 1];
56 PangoRenderPart last_part;
59 GdkDrawable *drawable;
63 static PangoAttrType gdk_pango_attr_stipple_type;
64 static PangoAttrType gdk_pango_attr_embossed_type;
71 G_DEFINE_TYPE (GdkPangoRenderer, gdk_pango_renderer, PANGO_TYPE_RENDERER)
74 gdk_pango_renderer_finalize (GObject *object)
76 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
77 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
81 g_object_unref (priv->base_gc);
83 g_object_unref (priv->drawable);
85 for (i = 0; i <= MAX_RENDER_PART; i++)
87 g_object_unref (priv->stipple[i]);
89 G_OBJECT_CLASS (gdk_pango_renderer_parent_class)->finalize (object);
93 gdk_pango_renderer_constructor (GType type,
94 guint n_construct_properties,
95 GObjectConstructParam *construct_params)
98 GdkPangoRenderer *gdk_renderer;
100 object = (* G_OBJECT_CLASS (gdk_pango_renderer_parent_class)->constructor) (type,
101 n_construct_properties,
104 gdk_renderer = GDK_PANGO_RENDERER (object);
106 if (!gdk_renderer->priv->screen)
108 g_warning ("Screen must be specified at construct time for GdkPangoRenderer");
109 gdk_renderer->priv->screen = gdk_screen_get_default ();
115 /* Adjusts matrix and color for the renderer to draw the secondary
116 * "shadow" copy for embossed text */
118 emboss_context (cairo_t *cr)
120 cairo_matrix_t tmp_matrix;
122 /* The gymnastics here to adjust the matrix are because we want
123 * to offset by +1,+1 in device-space, not in user-space,
124 * so we can't just draw the layout at x + 1, y + 1
126 cairo_get_matrix (cr, &tmp_matrix);
127 tmp_matrix.x0 += 1.0;
128 tmp_matrix.y0 += 1.0;
129 cairo_set_matrix (cr, &tmp_matrix);
131 cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
135 get_cairo_context (GdkPangoRenderer *gdk_renderer,
136 PangoRenderPart part)
138 PangoRenderer *renderer = PANGO_RENDERER (gdk_renderer);
139 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
143 const PangoMatrix *matrix;
145 priv->cr = gdk_cairo_create (priv->drawable);
147 matrix = pango_renderer_get_matrix (renderer);
150 cairo_matrix_t cairo_matrix;
152 cairo_matrix_init (&cairo_matrix,
153 matrix->xx, matrix->yx,
154 matrix->xy, matrix->yy,
155 matrix->x0, matrix->y0);
156 cairo_set_matrix (priv->cr, &cairo_matrix);
160 priv->last_part = (PangoRenderPart)-1;
161 if (part != priv->last_part)
163 PangoColor *pango_color = pango_renderer_get_color (renderer,
165 GdkColor *color = NULL;
169 tmp_color.red = pango_color->red;
170 tmp_color.green = pango_color->green;
171 tmp_color.blue = pango_color->blue;
176 _gdk_gc_update_context (priv->base_gc,
179 priv->stipple[part]);
180 priv->last_part = part;
187 gdk_pango_renderer_draw_glyphs (PangoRenderer *renderer,
189 PangoGlyphString *glyphs,
193 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
194 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
197 cr = get_cairo_context (gdk_renderer,
198 PANGO_RENDER_PART_FOREGROUND);
204 cairo_move_to (cr, x / PANGO_SCALE, y / PANGO_SCALE);
205 pango_cairo_show_glyph_string (cr, font, glyphs);
209 cairo_move_to (cr, x / PANGO_SCALE, y / PANGO_SCALE);
210 pango_cairo_show_glyph_string (cr, font, glyphs);
213 /* Draws an error underline that looks like one of:
216 * A/ \ / \ / \ A/ \ / \ |
217 * \ \ / \ / /D \ \ / \ |
218 * \ \/ C \/ / \ \/ C \ | height = HEIGHT_SQUARES * square
219 * \ /\ F / \ F /\ \ |
225 * unit_width = (HEIGHT_SQUARES - 1) * square
227 * The x, y, width, height passed in give the desired bounding box;
228 * x/width are adjusted to make the underline a integer number of units
231 #define HEIGHT_SQUARES 2.5
234 draw_error_underline (cairo_t *cr,
240 double square = height / HEIGHT_SQUARES;
241 double unit_width = (HEIGHT_SQUARES - 1) * square;
242 int width_units = (width + unit_width / 2) / unit_width;
243 double y_top, y_bottom;
246 x += (width - width_units * unit_width);
247 width = width_units * unit_width;
250 y_bottom = y + height;
252 /* Bottom of squiggle */
253 cairo_move_to (cr, x - square / 2, y_top + square / 2); /* A */
254 for (i = 0; i < width_units; i += 2)
256 double x_middle = x + (i + 1) * unit_width;
257 double x_right = x + (i + 2) * unit_width;
259 cairo_line_to (cr, x_middle, y_bottom); /* B */
261 if (i + 1 == width_units)
263 else if (i + 2 == width_units)
264 cairo_line_to (cr, x_right + square / 2, y_top + square / 2); /* D */
266 cairo_line_to (cr, x_right, y_top + square); /* C */
269 /* Top of squiggle */
270 for (i -= 2; i >= 0; i -= 2)
272 double x_left = x + i * unit_width;
273 double x_middle = x + (i + 1) * unit_width;
274 double x_right = x + (i + 2) * unit_width;
276 if (i + 1 == width_units)
277 cairo_line_to (cr, x_middle + square / 2, y_bottom - square / 2); /* G */
279 if (i + 2 == width_units)
280 cairo_line_to (cr, x_right, y_top); /* E */
281 cairo_line_to (cr, x_middle, y_bottom - square); /* F */
284 cairo_line_to (cr, x_left, y_top); /* H */
287 cairo_close_path (cr);
292 gdk_pango_renderer_draw_rectangle (PangoRenderer *renderer,
293 PangoRenderPart part,
299 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
300 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
303 cr = get_cairo_context (gdk_renderer, part);
305 if (priv->embossed && part != PANGO_RENDER_PART_BACKGROUND)
310 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
311 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
318 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
319 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
324 gdk_pango_renderer_draw_error_underline (PangoRenderer *renderer,
330 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
331 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
334 cr = get_cairo_context (gdk_renderer, PANGO_RENDER_PART_UNDERLINE);
340 draw_error_underline (cr,
341 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
342 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
346 draw_error_underline (cr,
347 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
348 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
352 gdk_pango_renderer_part_changed (PangoRenderer *renderer,
353 PangoRenderPart part)
355 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
357 if (gdk_renderer->priv->last_part == part)
358 gdk_renderer->priv->last_part = (PangoRenderPart)-1;
362 gdk_pango_renderer_begin (PangoRenderer *renderer)
364 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
365 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
367 if (!priv->drawable || !priv->base_gc)
369 g_warning ("gdk_pango_renderer_set_drawable() and gdk_pango_renderer_set_drawable()"
370 "must be used to set the target drawable and GC before using the renderer\n");
375 gdk_pango_renderer_end (PangoRenderer *renderer)
377 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
378 GdkPangoRendererPrivate *priv = gdk_renderer->priv;
382 cairo_destroy (priv->cr);
385 priv->last_part = (PangoRenderPart)-1;
389 gdk_pango_renderer_prepare_run (PangoRenderer *renderer,
392 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
393 gboolean embossed = FALSE;
394 GdkBitmap *stipple = NULL;
401 for (l = run->item->analysis.extra_attrs; l; l = l->next)
403 PangoAttribute *attr = l->data;
405 /* stipple_type and embossed_type aren't necessarily
406 * initialized, but they are 0, which is an
407 * invalid type so won't occur.
409 if (attr->klass->type == gdk_pango_attr_stipple_type)
411 stipple = ((GdkPangoAttrStipple*)attr)->stipple;
413 else if (attr->klass->type == gdk_pango_attr_embossed_type)
415 embossed = ((GdkPangoAttrEmbossed*)attr)->embossed;
419 gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_FOREGROUND, stipple);
420 gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_BACKGROUND, stipple);
421 gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_UNDERLINE, stipple);
422 gdk_pango_renderer_set_stipple (gdk_renderer, PANGO_RENDER_PART_STRIKETHROUGH, stipple);
424 if (embossed != gdk_renderer->priv->embossed)
426 gdk_renderer->priv->embossed = embossed;
427 pango_renderer_part_changed (renderer, PANGO_RENDER_PART_FOREGROUND);
430 PANGO_RENDERER_CLASS (gdk_pango_renderer_parent_class)->prepare_run (renderer, run);
432 for (i = 0; i <= MAX_RENDER_PART; i++)
434 if (gdk_renderer->priv->override_color_set[i])
435 pango_renderer_set_color (renderer, i, &gdk_renderer->priv->override_color[i]);
440 gdk_pango_renderer_set_property (GObject *object,
445 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
450 gdk_renderer->priv->screen = g_value_get_object (value);
453 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
459 gdk_pango_renderer_get_property (GObject *object,
464 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (object);
469 g_value_set_object (value, gdk_renderer->priv->screen);
472 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
478 gdk_pango_renderer_init (GdkPangoRenderer *renderer)
480 renderer->priv = G_TYPE_INSTANCE_GET_PRIVATE (renderer,
481 GDK_TYPE_PANGO_RENDERER,
482 GdkPangoRendererPrivate);
484 renderer->priv->last_part = (PangoRenderPart)-1;
488 gdk_pango_renderer_class_init (GdkPangoRendererClass *klass)
490 GObjectClass *object_class = G_OBJECT_CLASS (klass);
492 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
494 renderer_class->draw_glyphs = gdk_pango_renderer_draw_glyphs;
495 renderer_class->draw_rectangle = gdk_pango_renderer_draw_rectangle;
496 renderer_class->draw_error_underline = gdk_pango_renderer_draw_error_underline;
497 renderer_class->part_changed = gdk_pango_renderer_part_changed;
498 renderer_class->begin = gdk_pango_renderer_begin;
499 renderer_class->end = gdk_pango_renderer_end;
500 renderer_class->prepare_run = gdk_pango_renderer_prepare_run;
502 object_class->finalize = gdk_pango_renderer_finalize;
503 object_class->constructor = gdk_pango_renderer_constructor;
504 object_class->set_property = gdk_pango_renderer_set_property;
505 object_class->get_property = gdk_pango_renderer_get_property;
507 g_object_class_install_property (object_class,
509 g_param_spec_object ("screen",
511 P_("the GdkScreen for the renderer"),
513 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
514 G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK |
515 G_PARAM_STATIC_BLURB));
517 g_type_class_add_private (object_class, sizeof (GdkPangoRendererPrivate));
521 * gdk_pango_renderer_new:
522 * @screen: a #GdkScreen
524 * Creates a new #PangoRenderer for @screen. Normally you can use the
525 * results of gdk_pango_renderer_get_default() rather than creating a new
528 * Return value: a newly created #PangoRenderer. Free with g_object_unref().
533 gdk_pango_renderer_new (GdkScreen *screen)
535 g_return_val_if_fail (screen != NULL, NULL);
537 return g_object_new (GDK_TYPE_PANGO_RENDERER,
543 on_renderer_display_closed (GdkDisplay *display,
544 GdkPangoRenderer *renderer)
546 g_signal_handlers_disconnect_by_func (renderer->priv->screen,
547 (gpointer)on_renderer_display_closed,
549 g_object_set_data (G_OBJECT (renderer->priv->screen), "gdk-pango-renderer", NULL);
553 * gdk_pango_renderer_get_default:
554 * @screen: a #GdkScreen
556 * Gets the default #PangoRenderer for a screen. This default renderer
557 * is shared by all users of the display, so properties such as the color
558 * or transformation matrix set for the renderer may be overwritten
559 * by functions such as gdk_draw_layout().
561 * Before using the renderer, you need to call gdk_pango_renderer_set_drawable()
562 * and gdk_pango_renderer_set_gc() to set the drawable and graphics context
563 * to use for drawing.
565 * Return value: the default #PangoRenderer for @screen. The
566 * renderer is owned by GTK+ and will be kept around until the
572 gdk_pango_renderer_get_default (GdkScreen *screen)
574 PangoRenderer *renderer;
576 g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
578 renderer = g_object_get_data (G_OBJECT (screen), "gdk-pango-renderer");
581 renderer = gdk_pango_renderer_new (screen);
582 g_object_set_data_full (G_OBJECT (screen), "gdk-pango-renderer", renderer,
583 (GDestroyNotify)g_object_unref);
585 g_signal_connect (gdk_screen_get_display (screen), "closed",
586 G_CALLBACK (on_renderer_display_closed), renderer);
593 * gdk_pango_renderer_set_drawable:
594 * @gdk_renderer: a #GdkPangoRenderer
595 * @drawable: the new target drawable, or %NULL
597 * Sets the drawable the renderer draws to.
602 gdk_pango_renderer_set_drawable (GdkPangoRenderer *gdk_renderer,
603 GdkDrawable *drawable)
605 GdkPangoRendererPrivate *priv;
607 g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
608 g_return_if_fail (drawable == NULL || GDK_IS_DRAWABLE (drawable));
610 priv = gdk_renderer->priv;
612 if (priv->drawable != drawable)
615 g_object_unref (priv->drawable);
616 priv->drawable = drawable;
618 g_object_ref (priv->drawable);
623 * gdk_pango_renderer_set_gc:
624 * @gdk_renderer: a #GdkPangoRenderer
625 * @gc: the new GC to use for drawing, or %NULL
627 * Sets the GC the renderer draws with. Note that the GC must not be
628 * modified until it is unset by calling the function again with
629 * %NULL for the @gc parameter, since GDK may make internal copies
630 * of the GC which won't be updated to follow changes to the
636 gdk_pango_renderer_set_gc (GdkPangoRenderer *gdk_renderer,
639 GdkPangoRendererPrivate *priv;
641 g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
642 g_return_if_fail (gc == NULL || GDK_IS_GC (gc));
644 priv = gdk_renderer->priv;
646 if (priv->base_gc != gc)
649 g_object_unref (priv->base_gc);
652 g_object_ref (priv->base_gc);
658 * gdk_pango_renderer_set_stipple:
659 * @gdk_renderer: a #GdkPangoRenderer
660 * @part: the part to render with the stipple
661 * @stipple: the new stipple value.
663 * Sets the stipple for one render part (foreground, background, underline,
664 * etc.) Note that this is overwritten when iterating through the individual
665 * styled runs of a #PangoLayout or #PangoLayoutLine. This function is thus
666 * only useful when you call low level functions like pango_renderer_draw_glyphs()
667 * directly, or in the 'prepare_run' virtual function of a subclass of
673 gdk_pango_renderer_set_stipple (GdkPangoRenderer *gdk_renderer,
674 PangoRenderPart part,
677 g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
679 if (part > MAX_RENDER_PART) /* Silently ignore unknown parts */
682 if (stipple != gdk_renderer->priv->stipple[part])
684 if (gdk_renderer->priv->stipple[part])
685 g_object_unref (gdk_renderer->priv->stipple[part]);
687 gdk_renderer->priv->stipple[part] = stipple;
689 if (gdk_renderer->priv->stipple[part])
690 g_object_ref (gdk_renderer->priv->stipple[part]);
692 pango_renderer_part_changed (PANGO_RENDERER (gdk_renderer), part);
697 * gdk_pango_renderer_set_override_color:
698 * @gdk_renderer: a #GdkPangoRenderer
699 * @part: the part to render to set the color of
700 * @color: the color to use, or %NULL to unset a previously
701 * set override color.
703 * Sets the color for a particular render part (foreground,
704 * background, underline, etc.), overriding any attributes on the layouts
705 * renderered with this renderer.
710 gdk_pango_renderer_set_override_color (GdkPangoRenderer *gdk_renderer,
711 PangoRenderPart part,
712 const GdkColor *color)
714 GdkPangoRendererPrivate *priv;
716 g_return_if_fail (GDK_IS_PANGO_RENDERER (gdk_renderer));
718 priv = gdk_renderer->priv;
720 if (part > MAX_RENDER_PART) /* Silently ignore unknown parts */
725 priv->override_color[part].red = color->red;
726 priv->override_color[part].green = color->green;
727 priv->override_color[part].blue = color->blue;
728 priv->override_color_set[part] = TRUE;
731 priv->override_color_set[part] = FALSE;
735 * gdk_pango_context_set_colormap:
736 * @context: a #PangoContext
737 * @colormap: a #GdkColormap
739 * This function used to set the colormap to be used for drawing with
740 * @context. The colormap is now always derived from the graphics
741 * context used for drawing, so calling this function is no longer
745 gdk_pango_context_set_colormap (PangoContext *context,
746 GdkColormap *colormap)
748 g_return_if_fail (PANGO_IS_CONTEXT (context));
749 g_return_if_fail (colormap == NULL || GDK_IS_COLORMAP (colormap));
752 /* Gets a renderer to draw with, setting the properties of the
753 * renderer and activating it. Note that since we activate the
754 * renderer here, the implicit setting of the matrix that
755 * pango_renderer_draw_layout_[line] normally do when they
756 * activate the renderer is suppressed. */
757 static PangoRenderer *
758 get_renderer (GdkDrawable *drawable,
760 const GdkColor *foreground,
761 const GdkColor *background)
763 GdkScreen *screen = gdk_drawable_get_screen (drawable);
764 PangoRenderer *renderer = gdk_pango_renderer_get_default (screen);
765 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
767 gdk_pango_renderer_set_drawable (gdk_renderer, drawable);
768 gdk_pango_renderer_set_gc (gdk_renderer, gc);
770 gdk_pango_renderer_set_override_color (gdk_renderer,
771 PANGO_RENDER_PART_FOREGROUND,
773 gdk_pango_renderer_set_override_color (gdk_renderer,
774 PANGO_RENDER_PART_UNDERLINE,
776 gdk_pango_renderer_set_override_color (gdk_renderer,
777 PANGO_RENDER_PART_STRIKETHROUGH,
780 gdk_pango_renderer_set_override_color (gdk_renderer,
781 PANGO_RENDER_PART_BACKGROUND,
784 pango_renderer_activate (renderer);
789 /* Cleans up the renderer obtained with get_renderer() */
791 release_renderer (PangoRenderer *renderer)
793 GdkPangoRenderer *gdk_renderer = GDK_PANGO_RENDERER (renderer);
795 pango_renderer_deactivate (renderer);
797 gdk_pango_renderer_set_override_color (gdk_renderer,
798 PANGO_RENDER_PART_FOREGROUND,
800 gdk_pango_renderer_set_override_color (gdk_renderer,
801 PANGO_RENDER_PART_UNDERLINE,
803 gdk_pango_renderer_set_override_color (gdk_renderer,
804 PANGO_RENDER_PART_STRIKETHROUGH,
806 gdk_pango_renderer_set_override_color (gdk_renderer,
807 PANGO_RENDER_PART_BACKGROUND,
810 gdk_pango_renderer_set_drawable (gdk_renderer, NULL);
811 gdk_pango_renderer_set_gc (gdk_renderer, NULL);
815 * gdk_draw_layout_line_with_colors:
816 * @drawable: the drawable on which to draw the line
817 * @gc: base graphics to use
818 * @x: the x position of start of string (in pixels)
819 * @y: the y position of baseline (in pixels)
820 * @line: a #PangoLayoutLine
821 * @foreground: foreground override color, or %NULL for none
822 * @background: background override color, or %NULL for none
824 * Render a #PangoLayoutLine onto a #GdkDrawable, overriding the
825 * layout's normal colors with @foreground and/or @background.
826 * @foreground and @background need not be allocated.
828 * If the layout's #PangoContext has a transformation matrix set, then
829 * @x and @y specify the position of the left edge of the baseline
830 * (left is in before-tranform user coordinates) in after-transform
831 * device coordinates.
834 gdk_draw_layout_line_with_colors (GdkDrawable *drawable,
838 PangoLayoutLine *line,
839 const GdkColor *foreground,
840 const GdkColor *background)
842 PangoRenderer *renderer;
843 const PangoMatrix *matrix;
845 g_return_if_fail (GDK_IS_DRAWABLE (drawable));
846 g_return_if_fail (GDK_IS_GC (gc));
847 g_return_if_fail (line != NULL);
849 renderer = get_renderer (drawable, gc, foreground, background);
851 /* When we have a matrix, we do positioning by adjusting the matrix, and
852 * clamp just pass x=0, y=0 to the lower levels. We don't want to introduce
853 * a matrix when the caller didn't provide one, however, since that adds
854 * lots of floating point arithmetic for each glyph.
856 matrix = pango_context_get_matrix (pango_layout_get_context (line->layout));
859 PangoMatrix tmp_matrix;
861 tmp_matrix = *matrix;
864 pango_renderer_set_matrix (renderer, &tmp_matrix);
870 pango_renderer_set_matrix (renderer, NULL);
872 pango_renderer_draw_layout_line (renderer, line, x * PANGO_SCALE, y * PANGO_SCALE);
874 release_renderer (renderer);
877 /* Gets the bounds of a layout in device coordinates. Note cut-and-paste
878 * between here and gtklabel.c */
880 get_rotated_layout_bounds (PangoLayout *layout,
883 PangoContext *context = pango_layout_get_context (layout);
884 const PangoMatrix *matrix = pango_context_get_matrix (context);
885 gdouble x_min = 0, x_max = 0, y_min = 0, y_max = 0; /* quiet gcc */
886 PangoRectangle logical_rect;
889 pango_layout_get_extents (layout, NULL, &logical_rect);
891 for (i = 0; i < 2; i++)
893 gdouble x = (i == 0) ? logical_rect.x : logical_rect.x + logical_rect.width;
894 for (j = 0; j < 2; j++)
896 gdouble y = (j == 0) ? logical_rect.y : logical_rect.y + logical_rect.height;
898 gdouble xt = (x * matrix->xx + y * matrix->xy) / PANGO_SCALE + matrix->x0;
899 gdouble yt = (x * matrix->yx + y * matrix->yy) / PANGO_SCALE + matrix->y0;
901 if (i == 0 && j == 0)
920 rect->x = floor (x_min);
921 rect->width = ceil (x_max) - rect->x;
922 rect->y = floor (y_min);
923 rect->height = floor (y_max) - rect->y;
927 * gdk_draw_layout_with_colors:
928 * @drawable: the drawable on which to draw string
929 * @gc: base graphics context to use
930 * @x: the X position of the left of the layout (in pixels)
931 * @y: the Y position of the top of the layout (in pixels)
932 * @layout: a #PangoLayout
933 * @foreground: foreground override color, or %NULL for none
934 * @background: background override color, or %NULL for none
936 * Render a #PangoLayout onto a #GdkDrawable, overriding the
937 * layout's normal colors with @foreground and/or @background.
938 * @foreground and @background need not be allocated.
940 * If the layout's #PangoContext has a transformation matrix set, then
941 * @x and @y specify the position of the top left corner of the
942 * bounding box (in device space) of the transformed layout.
944 * If you're using GTK+, the ususal way to obtain a #PangoLayout
945 * is gtk_widget_create_pango_layout().
948 gdk_draw_layout_with_colors (GdkDrawable *drawable,
953 const GdkColor *foreground,
954 const GdkColor *background)
956 PangoRenderer *renderer;
957 const PangoMatrix *matrix;
959 g_return_if_fail (GDK_IS_DRAWABLE (drawable));
960 g_return_if_fail (GDK_IS_GC (gc));
961 g_return_if_fail (PANGO_IS_LAYOUT (layout));
963 renderer = get_renderer (drawable, gc, foreground, background);
965 /* When we have a matrix, we do positioning by adjusting the matrix, and
966 * clamp just pass x=0, y=0 to the lower levels. We don't want to introduce
967 * a matrix when the caller didn't provide one, however, since that adds
968 * lots of floating point arithmetic for each glyph.
970 matrix = pango_context_get_matrix (pango_layout_get_context (layout));
973 PangoMatrix tmp_matrix;
976 get_rotated_layout_bounds (layout, &rect);
978 tmp_matrix = *matrix;
979 tmp_matrix.x0 += x - rect.x;
980 tmp_matrix.y0 += y - rect.y;
981 pango_renderer_set_matrix (renderer, &tmp_matrix);
987 pango_renderer_set_matrix (renderer, NULL);
989 pango_renderer_draw_layout (renderer, layout, x * PANGO_SCALE, y * PANGO_SCALE);
991 release_renderer (renderer);
995 * gdk_draw_layout_line:
996 * @drawable: the drawable on which to draw the line
997 * @gc: base graphics to use
998 * @x: the x position of start of string (in pixels)
999 * @y: the y position of baseline (in pixels)
1000 * @line: a #PangoLayoutLine
1002 * Render a #PangoLayoutLine onto an GDK drawable
1004 * If the layout's #PangoContext has a transformation matrix set, then
1005 * @x and @y specify the position of the left edge of the baseline
1006 * (left is in before-tranform user coordinates) in after-transform
1007 * device coordinates.
1010 gdk_draw_layout_line (GdkDrawable *drawable,
1014 PangoLayoutLine *line)
1016 g_return_if_fail (GDK_IS_DRAWABLE (drawable));
1017 g_return_if_fail (GDK_IS_GC (gc));
1018 g_return_if_fail (line != NULL);
1020 gdk_draw_layout_line_with_colors (drawable, gc, x, y, line, NULL, NULL);
1025 * @drawable: the drawable on which to draw string
1026 * @gc: base graphics context to use
1027 * @x: the X position of the left of the layout (in pixels)
1028 * @y: the Y position of the top of the layout (in pixels)
1029 * @layout: a #PangoLayout
1031 * Render a #PangoLayout onto a GDK drawable
1033 * If the layout's #PangoContext has a transformation matrix set, then
1034 * @x and @y specify the position of the top left corner of the
1035 * bounding box (in device space) of the transformed layout.
1037 * If you're using GTK+, the usual way to obtain a #PangoLayout
1038 * is gtk_widget_create_pango_layout().
1041 gdk_draw_layout (GdkDrawable *drawable,
1045 PangoLayout *layout)
1047 g_return_if_fail (GDK_IS_DRAWABLE (drawable));
1048 g_return_if_fail (GDK_IS_GC (gc));
1049 g_return_if_fail (PANGO_IS_LAYOUT (layout));
1051 gdk_draw_layout_with_colors (drawable, gc, x, y, layout, NULL, NULL);
1054 static PangoAttribute *
1055 gdk_pango_attr_stipple_copy (const PangoAttribute *attr)
1057 const GdkPangoAttrStipple *src = (const GdkPangoAttrStipple*) attr;
1059 return gdk_pango_attr_stipple_new (src->stipple);
1063 gdk_pango_attr_stipple_destroy (PangoAttribute *attr)
1065 GdkPangoAttrStipple *st = (GdkPangoAttrStipple*) attr;
1068 g_object_unref (st->stipple);
1074 gdk_pango_attr_stipple_compare (const PangoAttribute *attr1,
1075 const PangoAttribute *attr2)
1077 const GdkPangoAttrStipple *a = (const GdkPangoAttrStipple*) attr1;
1078 const GdkPangoAttrStipple *b = (const GdkPangoAttrStipple*) attr2;
1080 return a->stipple == b->stipple;
1084 * gdk_pango_attr_stipple_new:
1085 * @stipple: a bitmap to be set as stipple
1087 * Creates a new attribute containing a stipple bitmap to be used when
1088 * rendering the text.
1090 * Return value: new #PangoAttribute
1094 gdk_pango_attr_stipple_new (GdkBitmap *stipple)
1096 GdkPangoAttrStipple *result;
1098 static PangoAttrClass klass = {
1100 gdk_pango_attr_stipple_copy,
1101 gdk_pango_attr_stipple_destroy,
1102 gdk_pango_attr_stipple_compare
1106 klass.type = gdk_pango_attr_stipple_type =
1107 pango_attr_type_register ("GdkPangoAttrStipple");
1109 result = g_new (GdkPangoAttrStipple, 1);
1110 result->attr.klass = &klass;
1113 g_object_ref (stipple);
1115 result->stipple = stipple;
1117 return (PangoAttribute *)result;
1120 static PangoAttribute *
1121 gdk_pango_attr_embossed_copy (const PangoAttribute *attr)
1123 const GdkPangoAttrEmbossed *e = (const GdkPangoAttrEmbossed*) attr;
1125 return gdk_pango_attr_embossed_new (e->embossed);
1129 gdk_pango_attr_embossed_destroy (PangoAttribute *attr)
1135 gdk_pango_attr_embossed_compare (const PangoAttribute *attr1,
1136 const PangoAttribute *attr2)
1138 const GdkPangoAttrEmbossed *e1 = (const GdkPangoAttrEmbossed*) attr1;
1139 const GdkPangoAttrEmbossed *e2 = (const GdkPangoAttrEmbossed*) attr2;
1141 return e1->embossed == e2->embossed;
1145 * gdk_pango_attr_embossed_new:
1146 * @embossed: a bitmap to be set as embossed
1148 * Creates a new attribute containing a embossed bitmap to be used when
1149 * rendering the text.
1151 * Return value: new #PangoAttribute
1155 gdk_pango_attr_embossed_new (gboolean embossed)
1157 GdkPangoAttrEmbossed *result;
1159 static PangoAttrClass klass = {
1161 gdk_pango_attr_embossed_copy,
1162 gdk_pango_attr_embossed_destroy,
1163 gdk_pango_attr_embossed_compare
1167 klass.type = gdk_pango_attr_embossed_type =
1168 pango_attr_type_register ("GdkPangoAttrEmbossed");
1170 result = g_new (GdkPangoAttrEmbossed, 1);
1171 result->attr.klass = &klass;
1172 result->embossed = embossed;
1174 return (PangoAttribute *)result;
1177 /* Get a clip region to draw only part of a layout. index_ranges
1178 * contains alternating range starts/stops. The region is the
1179 * region which contains the given ranges, i.e. if you draw with the
1180 * region as clip, only the given ranges are drawn.
1184 * gdk_pango_layout_line_get_clip_region:
1185 * @line: a #PangoLayoutLine
1186 * @x_origin: X pixel where you intend to draw the layout line with this clip
1187 * @y_origin: baseline pixel where you intend to draw the layout line with this clip
1188 * @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
1189 * @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
1191 * Obtains a clip region which contains the areas where the given
1192 * ranges of text would be drawn. @x_origin and @y_origin are the same
1193 * position you would pass to gdk_draw_layout_line(). @index_ranges
1194 * should contain ranges of bytes in the layout's text. The clip
1195 * region will include space to the left or right of the line (to the
1196 * layout bounding box) if you have indexes above or below the indexes
1197 * contained inside the line. This is to draw the selection all the way
1198 * to the side of the layout. However, the clip region is in line coordinates,
1199 * not layout coordinates.
1201 * Return value: a clip region containing the given ranges
1204 gdk_pango_layout_line_get_clip_region (PangoLayoutLine *line,
1210 GdkRegion *clip_region;
1212 PangoRectangle logical_rect;
1213 PangoLayoutIter *iter;
1216 g_return_val_if_fail (line != NULL, NULL);
1217 g_return_val_if_fail (index_ranges != NULL, NULL);
1219 clip_region = gdk_region_new ();
1221 iter = pango_layout_get_iter (line->layout);
1222 while (pango_layout_iter_get_line (iter) != line)
1223 pango_layout_iter_next_line (iter);
1225 pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
1226 baseline = pango_layout_iter_get_baseline (iter);
1228 pango_layout_iter_free (iter);
1231 while (i < n_ranges)
1233 gint *pixel_ranges = NULL;
1234 gint n_pixel_ranges = 0;
1237 /* Note that get_x_ranges returns layout coordinates
1239 if (index_ranges[i*2+1] >= line->start_index &&
1240 index_ranges[i*2] < line->start_index + line->length)
1241 pango_layout_line_get_x_ranges (line,
1243 index_ranges[i*2+1],
1244 &pixel_ranges, &n_pixel_ranges);
1246 for (j = 0; j < n_pixel_ranges; j++)
1250 rect.x = x_origin + pixel_ranges[2*j] / PANGO_SCALE - logical_rect.x / PANGO_SCALE;
1251 rect.y = y_origin - (baseline / PANGO_SCALE - logical_rect.y / PANGO_SCALE);
1252 rect.width = (pixel_ranges[2*j + 1] - pixel_ranges[2*j]) / PANGO_SCALE;
1253 rect.height = logical_rect.height / PANGO_SCALE;
1255 gdk_region_union_with_rect (clip_region, &rect);
1258 g_free (pixel_ranges);
1266 * gdk_pango_layout_get_clip_region:
1267 * @layout: a #PangoLayout
1268 * @x_origin: X pixel where you intend to draw the layout with this clip
1269 * @y_origin: Y pixel where you intend to draw the layout with this clip
1270 * @index_ranges: array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
1271 * @n_ranges: number of ranges in @index_ranges, i.e. half the size of @index_ranges
1273 * Obtains a clip region which contains the areas where the given ranges
1274 * of text would be drawn. @x_origin and @y_origin are the same position
1275 * you would pass to gdk_draw_layout_line(). @index_ranges should contain
1276 * ranges of bytes in the layout's text.
1278 * Return value: a clip region containing the given ranges
1281 gdk_pango_layout_get_clip_region (PangoLayout *layout,
1287 PangoLayoutIter *iter;
1288 GdkRegion *clip_region;
1290 g_return_val_if_fail (PANGO_IS_LAYOUT (layout), NULL);
1291 g_return_val_if_fail (index_ranges != NULL, NULL);
1293 clip_region = gdk_region_new ();
1295 iter = pango_layout_get_iter (layout);
1299 PangoRectangle logical_rect;
1300 PangoLayoutLine *line;
1301 GdkRegion *line_region;
1304 line = pango_layout_iter_get_line (iter);
1306 pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
1307 baseline = pango_layout_iter_get_baseline (iter);
1309 line_region = gdk_pango_layout_line_get_clip_region (line,
1310 x_origin + logical_rect.x / PANGO_SCALE,
1311 y_origin + baseline / PANGO_SCALE,
1315 gdk_region_union (clip_region, line_region);
1316 gdk_region_destroy (line_region);
1318 while (pango_layout_iter_next_line (iter));
1320 pango_layout_iter_free (iter);
1326 * gdk_pango_context_get:
1328 * Creates a #PangoContext for the default GDK screen.
1330 * The context must be freed when you're finished with it.
1332 * When using GTK+, normally you should use gtk_widget_get_pango_context()
1333 * instead of this function, to get the appropriate context for
1334 * the widget you intend to render text onto.
1336 * Return value: a new #PangoContext for the default display
1339 gdk_pango_context_get (void)
1341 return gdk_pango_context_get_for_screen (gdk_screen_get_default ());
1345 * gdk_pango_context_get_for_screen:
1346 * @screen: the #GdkScreen for which the context is to be created.
1348 * Creates a #PangoContext for @screen.
1350 * The context must be freed when you're finished with it.
1352 * When using GTK+, normally you should use gtk_widget_get_pango_context()
1353 * instead of this function, to get the appropriate context for
1354 * the widget you intend to render text onto.
1356 * Return value: a new #PangoContext for @screen
1361 gdk_pango_context_get_for_screen (GdkScreen *screen)
1363 PangoFontMap *fontmap;
1365 g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
1367 fontmap = pango_cairo_font_map_get_default ();
1369 return pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
1372 #define __GDK_PANGO_C__
1373 #include "gdkaliasdef.c"