/* GDK - The GIMP Drawing Kit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * 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 #include #include "gdkalias.h" #include "gdkdrawable.h" #include "gdkinternals.h" #include "gdkwindow.h" #include "gdkscreen.h" #include "gdk-pixbuf-private.h" #include "gdkpixbuf.h" static GdkImage* gdk_drawable_real_get_image (GdkDrawable *drawable, gint x, gint y, gint width, gint height); static GdkDrawable* gdk_drawable_real_get_composite_drawable (GdkDrawable *drawable, gint x, gint y, gint width, gint height, gint *composite_x_offset, gint *composite_y_offset); static GdkRegion * gdk_drawable_real_get_visible_region (GdkDrawable *drawable); static void gdk_drawable_real_draw_pixbuf (GdkDrawable *drawable, GdkGC *gc, GdkPixbuf *pixbuf, gint src_x, gint src_y, gint dest_x, gint dest_y, gint width, gint height, GdkRgbDither dither, gint x_dither, gint y_dither); static void gdk_drawable_real_draw_trapezoids (GdkDrawable *drawable, GdkGC *gc, GdkTrapezoid *trapezoids, gint n_trapezoids); static void gdk_drawable_class_init (GdkDrawableClass *klass); GType gdk_drawable_get_type (void) { static GType object_type = 0; if (!object_type) { static const GTypeInfo object_info = { sizeof (GdkDrawableClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gdk_drawable_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (GdkDrawable), 0, /* n_preallocs */ (GInstanceInitFunc) NULL, }; object_type = g_type_register_static (G_TYPE_OBJECT, "GdkDrawable", &object_info, G_TYPE_FLAG_ABSTRACT); } return object_type; } static void gdk_drawable_class_init (GdkDrawableClass *klass) { klass->get_image = gdk_drawable_real_get_image; klass->get_composite_drawable = gdk_drawable_real_get_composite_drawable; /* Default implementation for clip and visible region is the same */ klass->get_clip_region = gdk_drawable_real_get_visible_region; klass->get_visible_region = gdk_drawable_real_get_visible_region; klass->draw_pixbuf = gdk_drawable_real_draw_pixbuf; klass->draw_trapezoids = gdk_drawable_real_draw_trapezoids; } /* Manipulation of drawables */ /** * gdk_drawable_set_data: * @drawable: a #GdkDrawable * @key: name to store the data under * @data: arbitrary data * @destroy_func: function to free @data, or %NULL * * This function is equivalent to g_object_set_data(), * the #GObject variant should be used instead. * **/ void gdk_drawable_set_data (GdkDrawable *drawable, const gchar *key, gpointer data, GDestroyNotify destroy_func) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_object_set_qdata_full (G_OBJECT (drawable), g_quark_from_string (key), data, destroy_func); } /** * gdk_drawable_get_data: * @drawable: a #GdkDrawable * @key: name the data was stored under * * Equivalent to g_object_get_data(); the #GObject variant should be * used instead. * * Return value: the data stored at @key **/ gpointer gdk_drawable_get_data (GdkDrawable *drawable, const gchar *key) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return g_object_get_qdata (G_OBJECT (drawable), g_quark_try_string (key)); } /** * gdk_drawable_get_size: * @drawable: a #GdkDrawable * @width: location to store drawable's width, or %NULL * @height: location to store drawable's height, or %NULL * * Fills *@width and *@height with the size of @drawable. * @width or @height can be %NULL if you only want the other one. * * On the X11 platform, if @drawable is a #GdkWindow, the returned * size is the size reported in the most-recently-processed configure * event, rather than the current size on the X server. * **/ void gdk_drawable_get_size (GdkDrawable *drawable, gint *width, gint *height) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); GDK_DRAWABLE_GET_CLASS (drawable)->get_size (drawable, width, height); } /** * gdk_drawable_get_visual: * @drawable: a #GdkDrawable * * Gets the #GdkVisual describing the pixel format of @drawable. * * Return value: a #GdkVisual **/ GdkVisual* gdk_drawable_get_visual (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->get_visual (drawable); } /** * gdk_drawable_get_depth: * @drawable: a #GdkDrawable * * Obtains the bit depth of the drawable, that is, the number of bits * that make up a pixel in the drawable's visual. Examples are 8 bits * per pixel, 24 bits per pixel, etc. * * Return value: number of bits per pixel **/ gint gdk_drawable_get_depth (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), 0); return GDK_DRAWABLE_GET_CLASS (drawable)->get_depth (drawable); } /** * gdk_drawable_get_screen: * @drawable: a #GdkDrawable * * Gets the #GdkScreen associated with a #GdkDrawable. * * Return value: the #GdkScreen associated with @drawable * * Since: 2.2 **/ GdkScreen* gdk_drawable_get_screen(GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->get_screen (drawable); } /** * gdk_drawable_get_display: * @drawable: a #GdkDrawable * * Gets the #GdkDisplay associated with a #GdkDrawable. * * Return value: the #GdkDisplay associated with @drawable * * Since: 2.2 **/ GdkDisplay* gdk_drawable_get_display (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return gdk_screen_get_display (gdk_drawable_get_screen (drawable)); } /** * gdk_drawable_set_colormap: * @drawable: a #GdkDrawable * @colormap: a #GdkColormap * * Sets the colormap associated with @drawable. Normally this will * happen automatically when the drawable is created; you only need to * use this function if the drawable-creating function did not have a * way to determine the colormap, and you then use drawable operations * that require a colormap. The colormap for all drawables and * graphics contexts you intend to use together should match. i.e. * when using a #GdkGC to draw to a drawable, or copying one drawable * to another, the colormaps should match. * **/ void gdk_drawable_set_colormap (GdkDrawable *drawable, GdkColormap *cmap) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (cmap == NULL || gdk_drawable_get_depth (drawable) == cmap->visual->depth); GDK_DRAWABLE_GET_CLASS (drawable)->set_colormap (drawable, cmap); } /** * gdk_drawable_get_colormap: * @drawable: a #GdkDrawable * * Gets the colormap for @drawable, if one is set; returns * %NULL otherwise. * * Return value: the colormap, or %NULL **/ GdkColormap* gdk_drawable_get_colormap (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->get_colormap (drawable); } /** * gdk_drawable_ref: * @drawable: a #GdkDrawable * * Deprecated equivalent of calling g_object_ref() on @drawable. * (Drawables were not objects in previous versions of GDK.) * * Return value: the same @drawable passed in **/ GdkDrawable* gdk_drawable_ref (GdkDrawable *drawable) { return (GdkDrawable *) g_object_ref (drawable); } /** * gdk_drawable_unref: * @drawable: a #GdkDrawable * * Deprecated equivalent of calling g_object_unref() on @drawable. * **/ void gdk_drawable_unref (GdkDrawable *drawable) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_object_unref (drawable); } /* Drawing */ /** * gdk_draw_point: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @x: the x coordinate of the point. * @y: the y coordinate of the point. * * Draws a point, using the foreground color and other attributes of * the #GdkGC. **/ void gdk_draw_point (GdkDrawable *drawable, GdkGC *gc, gint x, gint y) { GdkPoint point; g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); point.x = x; point.y = y; GDK_DRAWABLE_GET_CLASS (drawable)->draw_points (drawable, gc, &point, 1); } /** * gdk_draw_line: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @x1_: the x coordinate of the start point. * @y1_: the y coordinate of the start point. * @x2_: the x coordinate of the end point. * @y2_: the y coordinate of the end point. * * Draws a line, using the foreground color and other attributes of * the #GdkGC. **/ void gdk_draw_line (GdkDrawable *drawable, GdkGC *gc, gint x1, gint y1, gint x2, gint y2) { GdkSegment segment; g_return_if_fail (drawable != NULL); g_return_if_fail (gc != NULL); g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); segment.x1 = x1; segment.y1 = y1; segment.x2 = x2; segment.y2 = y2; GDK_DRAWABLE_GET_CLASS (drawable)->draw_segments (drawable, gc, &segment, 1); } /** * gdk_draw_rectangle: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @filled: %TRUE if the rectangle should be filled. * @x: the x coordinate of the left edge of the rectangle. * @y: the y coordinate of the top edge of the rectangle. * @width: the width of the rectangle. * @height: the height of the rectangle. * * Draws a rectangular outline or filled rectangle, using the foreground color * and other attributes of the #GdkGC. * * A rectangle drawn filled is 1 pixel smaller in both dimensions than a * rectangle outlined. Calling * gdk_draw_rectangle (window, gc, TRUE, 0, 0, 20, 20) * results in a filled rectangle 20 pixels wide and 20 pixels high. Calling * gdk_draw_rectangle (window, gc, FALSE, 0, 0, 20, 20) * results in an outlined rectangle with corners at (0, 0), (0, 20), (20, 20), * and (20, 0), which makes it 21 pixels wide and 21 pixels high. **/ void gdk_draw_rectangle (GdkDrawable *drawable, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); if (width < 0 || height < 0) { gint real_width; gint real_height; gdk_drawable_get_size (drawable, &real_width, &real_height); if (width < 0) width = real_width; if (height < 0) height = real_height; } GDK_DRAWABLE_GET_CLASS (drawable)->draw_rectangle (drawable, gc, filled, x, y, width, height); } /** * gdk_draw_arc: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @filled: %TRUE if the arc should be filled, producing a 'pie slice'. * @x: the x coordinate of the left edge of the bounding rectangle. * @y: the y coordinate of the top edge of the bounding rectangle. * @width: the width of the bounding rectangle. * @height: the height of the bounding rectangle. * @angle1: the start angle of the arc, relative to the 3 o'clock position, * counter-clockwise, in 1/64ths of a degree. * @angle2: the end angle of the arc, relative to @angle1, in 1/64ths * of a degree. * * Draws an arc or a filled 'pie slice'. The arc is defined by the bounding * rectangle of the entire ellipse, and the start and end angles of the part * of the ellipse to be drawn. **/ void gdk_draw_arc (GdkDrawable *drawable, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); if (width < 0 || height < 0) { gint real_width; gint real_height; gdk_drawable_get_size (drawable, &real_width, &real_height); if (width < 0) width = real_width; if (height < 0) height = real_height; } GDK_DRAWABLE_GET_CLASS (drawable)->draw_arc (drawable, gc, filled, x, y, width, height, angle1, angle2); } /** * gdk_draw_polygon: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @filled: %TRUE if the polygon should be filled. The polygon is closed * automatically, connecting the last point to the first point if * necessary. * @points: an array of #GdkPoint structures specifying the points making * up the polygon. * @npoints: the number of points. * * Draws an outlined or filled polygon. **/ void gdk_draw_polygon (GdkDrawable *drawable, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); GDK_DRAWABLE_GET_CLASS (drawable)->draw_polygon (drawable, gc, filled, points, npoints); } /* gdk_draw_string * * Modified by Li-Da Lho to draw 16 bits and Multibyte strings * * Interface changed: add "GdkFont *font" to specify font or fontset explicitely */ /** * gdk_draw_string: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @font: a #GdkFont. * @gc: a #GdkGC. * @x: the x coordinate of the left edge of the text. * @y: the y coordinate of the baseline of the text. * @string: the string of characters to draw. * * Draws a string of characters in the given font or fontset. * * Deprecated: Use gdk_draw_layout() instead. **/ void gdk_draw_string (GdkDrawable *drawable, GdkFont *font, GdkGC *gc, gint x, gint y, const gchar *string) { gdk_draw_text (drawable, font, gc, x, y, string, _gdk_font_strlen (font, string)); } /* gdk_draw_text * * Modified by Li-Da Lho to draw 16 bits and Multibyte strings * * Interface changed: add "GdkFont *font" to specify font or fontset explicitely */ /** * gdk_draw_text: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @font: a #GdkFont. * @gc: a #GdkGC. * @x: the x coordinate of the left edge of the text. * @y: the y coordinate of the baseline of the text. * @text: the characters to draw. * @text_length: the number of characters of @text to draw. * * Draws a number of characters in the given font or fontset. * * Deprecated: Use gdk_draw_layout() instead. **/ void gdk_draw_text (GdkDrawable *drawable, GdkFont *font, GdkGC *gc, gint x, gint y, const gchar *text, gint text_length) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (font != NULL); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (text != NULL); GDK_DRAWABLE_GET_CLASS (drawable)->draw_text (drawable, font, gc, x, y, text, text_length); } /** * gdk_draw_text_wc: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @font: a #GdkFont. * @gc: a #GdkGC. * @x: the x coordinate of the left edge of the text. * @y: the y coordinate of the baseline of the text. * @text: the wide characters to draw. * @text_length: the number of characters to draw. * * Draws a number of wide characters using the given font of fontset. * If the font is a 1-byte font, the string is converted into 1-byte * characters (discarding the high bytes) before output. * * Deprecated: Use gdk_draw_layout() instead. **/ void gdk_draw_text_wc (GdkDrawable *drawable, GdkFont *font, GdkGC *gc, gint x, gint y, const GdkWChar *text, gint text_length) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (font != NULL); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (text != NULL); GDK_DRAWABLE_GET_CLASS (drawable)->draw_text_wc (drawable, font, gc, x, y, text, text_length); } /** * gdk_draw_drawable: * @drawable: a #GdkDrawable * @gc: a #GdkGC sharing the drawable's visual and colormap * @src: the source #GdkDrawable, which may be the same as @drawable * @xsrc: X position in @src of rectangle to draw * @ysrc: Y position in @src of rectangle to draw * @xdest: X position in @drawable where the rectangle should be drawn * @ydest: Y position in @drawable where the rectangle should be drawn * @width: width of rectangle to draw, or -1 for entire @src width * @height: height of rectangle to draw, or -1 for entire @src height * * Copies the @width x @height region of @src at coordinates (@xsrc, * @ysrc) to coordinates (@xdest, @ydest) in @drawable. * @width and/or @height may be given as -1, in which case the entire * @src drawable will be copied. * * Most fields in @gc are not used for this operation, but notably the * clip mask or clip region will be honored. * * The source and destination drawables must have the same visual and * colormap, or errors will result. (On X11, failure to match * visual/colormap results in a BadMatch error from the X server.) * A common cause of this problem is an attempt to draw a bitmap to * a color drawable. The way to draw a bitmap is to set the * bitmap as a clip mask on your #GdkGC, then use gdk_draw_rectangle() * to draw a rectangle clipped to the bitmap. **/ void gdk_draw_drawable (GdkDrawable *drawable, GdkGC *gc, GdkDrawable *src, gint xsrc, gint ysrc, gint xdest, gint ydest, gint width, gint height) { GdkDrawable *composite; gint composite_x_offset = 0; gint composite_y_offset = 0; g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (src != NULL); g_return_if_fail (GDK_IS_GC (gc)); if (width < 0 || height < 0) { gint real_width; gint real_height; gdk_drawable_get_size (src, &real_width, &real_height); if (width < 0) width = real_width; if (height < 0) height = real_height; } composite = GDK_DRAWABLE_GET_CLASS (src)->get_composite_drawable (src, xsrc, ysrc, width, height, &composite_x_offset, &composite_y_offset); GDK_DRAWABLE_GET_CLASS (drawable)->draw_drawable (drawable, gc, composite, xsrc - composite_x_offset, ysrc - composite_y_offset, xdest, ydest, width, height); g_object_unref (composite); } /** * gdk_draw_image: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @image: the #GdkImage to draw. * @xsrc: the left edge of the source rectangle within @image. * @ysrc: the top of the source rectangle within @image. * @xdest: the x coordinate of the destination within @drawable. * @ydest: the y coordinate of the destination within @drawable. * @width: the width of the area to be copied, or -1 to make the area * extend to the right edge of @image. * @height: the height of the area to be copied, or -1 to make the area * extend to the bottom edge of @image. * * Draws a #GdkImage onto a drawable. * The depth of the #GdkImage must match the depth of the #GdkDrawable. **/ void gdk_draw_image (GdkDrawable *drawable, GdkGC *gc, GdkImage *image, gint xsrc, gint ysrc, gint xdest, gint ydest, gint width, gint height) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (image != NULL); g_return_if_fail (GDK_IS_GC (gc)); if (width == -1) width = image->width; if (height == -1) height = image->height; GDK_DRAWABLE_GET_CLASS (drawable)->draw_image (drawable, gc, image, xsrc, ysrc, xdest, ydest, width, height); } /** * gdk_draw_pixbuf: * @drawable: Destination drawable. * @gc: a #GdkGC, used for clipping, or %NULL * @pixbuf: a #GdkPixbuf * @src_x: Source X coordinate within pixbuf. * @src_y: Source Y coordinates within pixbuf. * @dest_x: Destination X coordinate within drawable. * @dest_y: Destination Y coordinate within drawable. * @width: Width of region to render, in pixels, or -1 to use pixbuf width. * @height: Height of region to render, in pixels, or -1 to use pixbuf height. * @dither: Dithering mode for #GdkRGB. * @x_dither: X offset for dither. * @y_dither: Y offset for dither. * * Renders a rectangular portion of a pixbuf to a drawable. The destination * drawable must have a colormap. All windows have a colormap, however, pixmaps * only have colormap by default if they were created with a non-%NULL window * argument. Otherwise a colormap must be set on them with * gdk_drawable_set_colormap(). * * On older X servers, rendering pixbufs with an alpha channel involves round * trips to the X server, and may be somewhat slow. * * The clip mask of @gc is ignored, but clip rectangles and clip regions work * fine. * * Since: 2.2 **/ void gdk_draw_pixbuf (GdkDrawable *drawable, GdkGC *gc, GdkPixbuf *pixbuf, gint src_x, gint src_y, gint dest_x, gint dest_y, gint width, gint height, GdkRgbDither dither, gint x_dither, gint y_dither) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (gc == NULL || GDK_IS_GC (gc)); g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); if (width == -1) width = gdk_pixbuf_get_width (pixbuf); if (height == -1) height = gdk_pixbuf_get_height (pixbuf); GDK_DRAWABLE_GET_CLASS (drawable)->draw_pixbuf (drawable, gc, pixbuf, src_x, src_y, dest_x, dest_y, width, height, dither, x_dither, y_dither); } /** * gdk_draw_points: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @points: an array of #GdkPoint structures. * @npoints: the number of points to be drawn. * * Draws a number of points, using the foreground color and other * attributes of the #GdkGC. **/ void gdk_draw_points (GdkDrawable *drawable, GdkGC *gc, GdkPoint *points, gint npoints) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail ((points != NULL) && (npoints > 0)); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (npoints >= 0); if (npoints == 0) return; GDK_DRAWABLE_GET_CLASS (drawable)->draw_points (drawable, gc, points, npoints); } /** * gdk_draw_segments: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @segs: an array of #GdkSegment structures specifying the start and * end points of the lines to be drawn. * @nsegs: the number of line segments to draw, i.e. the size of the * @segs array. * * Draws a number of unconnected lines. **/ void gdk_draw_segments (GdkDrawable *drawable, GdkGC *gc, GdkSegment *segs, gint nsegs) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); if (nsegs == 0) return; g_return_if_fail (segs != NULL); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (nsegs >= 0); GDK_DRAWABLE_GET_CLASS (drawable)->draw_segments (drawable, gc, segs, nsegs); } /** * gdk_draw_lines: * @drawable: a #GdkDrawable (a #GdkWindow or a #GdkPixmap). * @gc: a #GdkGC. * @points: an array of #GdkPoint structures specifying the endpoints of the * @npoints: the size of the @points array. * * Draws a series of lines connecting the given points. * The way in which joins between lines are draw is determined by the * #GdkCapStyle value in the #GdkGC. This can be set with * gdk_gc_set_line_attributes(). **/ void gdk_draw_lines (GdkDrawable *drawable, GdkGC *gc, GdkPoint *points, gint npoints) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (points != NULL); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (npoints >= 0); if (npoints == 0) return; GDK_DRAWABLE_GET_CLASS (drawable)->draw_lines (drawable, gc, points, npoints); } /** * gdk_draw_glyphs: * @drawable: a #GdkDrawable * @gc: a #GdkGC * @font: font to be used * @x: X coordinate of baseline origin * @y: Y coordinate of baseline origin * @glyphs: the glyph string to draw * * This is a low-level function; 99% of text rendering should be done * using gdk_draw_layout() instead. * * A glyph is a single image in a font. This function draws a sequence of * glyphs. To obtain a sequence of glyphs you have to understand a * lot about internationalized text handling, which you don't want to * understand; thus, use gdk_draw_layout() instead of this function, * gdk_draw_layout() handles the details. * **/ void gdk_draw_glyphs (GdkDrawable *drawable, GdkGC *gc, PangoFont *font, gint x, gint y, PangoGlyphString *glyphs) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); GDK_DRAWABLE_GET_CLASS (drawable)->draw_glyphs (drawable, gc, font, x, y, glyphs); } /** * gdk_draw_glyphs_transformed: * @drawable: a #GdkDrawable * @gc: a #GdkGC * @matrix: a #PangoMatrix, or %NULL to use an identity transformation * @font: the font in which to draw the string * @x: the x position of the start of the string (in Pango * units in user space coordinates) * @y: the y position of the baseline (in Pango units * in user space coordinates) * @glyphs: the glyph string to draw * * Renders a #PangoGlyphString onto a drawable, possibly * transforming the layed-out coordinates through a transformation * matrix. Note that the transformation matrix for @font is not * changed, so to produce correct rendering results, the @font * must have been loaded using a #PangoContext with an identical * transformation matrix to that passed in to this function. * * See also gdk_draw_glyphs(), gdk_draw_layout(). * * Since: 2.6 **/ void gdk_draw_glyphs_transformed (GdkDrawable *drawable, GdkGC *gc, PangoMatrix *matrix, PangoFont *font, gint x, gint y, PangoGlyphString *glyphs) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); if (GDK_DRAWABLE_GET_CLASS (drawable)->draw_glyphs_transformed) GDK_DRAWABLE_GET_CLASS (drawable)->draw_glyphs_transformed (drawable, gc, matrix, font, x, y, glyphs); } /** * gdk_draw_trapezoids: * @drawable: a #GdkDrawable * @gc: a #GdkGC * @trapezoids: an array of #GdkTrapezoid structures * @n_trapezoids: the number of trapezoids to draw * * Draws a set of anti-aliased trapezoids. The trapezoids are * combined using saturation addition, then drawn over the background * as a set. This is low level functionality used internally to implement * rotated underlines and backgrouds when rendering a PangoLayout and is * likely not useful for applications. * * Since: 2.6 **/ void gdk_draw_trapezoids (GdkDrawable *drawable, GdkGC *gc, GdkTrapezoid *trapezoids, gint n_trapezoids) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (GDK_IS_GC (gc)); g_return_if_fail (n_trapezoids == 0 || trapezoids != NULL); GDK_DRAWABLE_GET_CLASS (drawable)->draw_trapezoids (drawable, gc, trapezoids, n_trapezoids); } /** * gdk_drawable_copy_to_image: * @drawable: a #GdkDrawable * @image: a #GdkDrawable, or %NULL if a new @image should be created. * @src_x: x coordinate on @drawable * @src_y: y coordinate on @drawable * @dest_x: x coordinate within @image. Must be 0 if @image is %NULL * @dest_y: y coordinate within @image. Must be 0 if @image is %NULL * @width: width of region to get * @height: height or region to get * * Copies a portion of @drawable into the client side image structure * @image. If @image is %NULL, creates a new image of size @width x @height * and copies into that. See gdk_drawable_get_image() for further details. * * Return value: @image, or a new a #GdkImage containing the contents * of @drawable * * Since: 2.4 **/ GdkImage* gdk_drawable_copy_to_image (GdkDrawable *drawable, GdkImage *image, gint src_x, gint src_y, gint dest_x, gint dest_y, gint width, gint height) { GdkDrawable *composite; gint composite_x_offset = 0; gint composite_y_offset = 0; GdkImage *retval; GdkColormap *cmap; g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); g_return_val_if_fail (src_x >= 0, NULL); g_return_val_if_fail (src_y >= 0, NULL); /* FIXME? Note race condition since we get the size then * get the image, and the size may have changed. */ if (width < 0 || height < 0) gdk_drawable_get_size (drawable, width < 0 ? &width : NULL, height < 0 ? &height : NULL); composite = GDK_DRAWABLE_GET_CLASS (drawable)->get_composite_drawable (drawable, src_x, src_y, width, height, &composite_x_offset, &composite_y_offset); retval = GDK_DRAWABLE_GET_CLASS (composite)->_copy_to_image (composite, image, src_x - composite_x_offset, src_y - composite_y_offset, dest_x, dest_y, width, height); g_object_unref (composite); if (!image && retval) { cmap = gdk_drawable_get_colormap (drawable); if (cmap) gdk_image_set_colormap (retval, cmap); } return retval; } /** * gdk_drawable_get_image: * @drawable: a #GdkDrawable * @x: x coordinate on @drawable * @y: y coordinate on @drawable * @width: width of region to get * @height: height or region to get * * A #GdkImage stores client-side image data (pixels). In contrast, * #GdkPixmap and #GdkWindow are server-side * objects. gdk_drawable_get_image() obtains the pixels from a * server-side drawable as a client-side #GdkImage. The format of a * #GdkImage depends on the #GdkVisual of the current display, which * makes manipulating #GdkImage extremely difficult; therefore, in * most cases you should use gdk_pixbuf_get_from_drawable() instead of * this lower-level function. A #GdkPixbuf contains image data in a * canonicalized RGB format, rather than a display-dependent format. * Of course, there's a convenience vs. speed tradeoff here, so you'll * want to think about what makes sense for your application. * * @x, @y, @width, and @height define the region of @drawable to * obtain as an image. * * You would usually copy image data to the client side if you intend * to examine the values of individual pixels, for example to darken * an image or add a red tint. It would be prohibitively slow to * make a round-trip request to the windowing system for each pixel, * so instead you get all of them at once, modify them, then copy * them all back at once. * * If the X server or other windowing system backend is on the local * machine, this function may use shared memory to avoid copying * the image data. * * If the source drawable is a #GdkWindow and partially offscreen * or obscured, then the obscured portions of the returned image * will contain undefined data. * * Return value: a #GdkImage containing the contents of @drawable **/ GdkImage* gdk_drawable_get_image (GdkDrawable *drawable, gint x, gint y, gint width, gint height) { GdkDrawable *composite; gint composite_x_offset = 0; gint composite_y_offset = 0; GdkImage *retval; GdkColormap *cmap; g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); g_return_val_if_fail (x >= 0, NULL); g_return_val_if_fail (y >= 0, NULL); /* FIXME? Note race condition since we get the size then * get the image, and the size may have changed. */ if (width < 0 || height < 0) gdk_drawable_get_size (drawable, width < 0 ? &width : NULL, height < 0 ? &height : NULL); composite = GDK_DRAWABLE_GET_CLASS (drawable)->get_composite_drawable (drawable, x, y, width, height, &composite_x_offset, &composite_y_offset); retval = GDK_DRAWABLE_GET_CLASS (composite)->get_image (composite, x - composite_x_offset, y - composite_y_offset, width, height); g_object_unref (composite); cmap = gdk_drawable_get_colormap (drawable); if (retval && cmap) gdk_image_set_colormap (retval, cmap); return retval; } static GdkImage* gdk_drawable_real_get_image (GdkDrawable *drawable, gint x, gint y, gint width, gint height) { return gdk_drawable_copy_to_image (drawable, NULL, x, y, 0, 0, width, height); } static GdkDrawable* gdk_drawable_real_get_composite_drawable (GdkDrawable *drawable, gint x, gint y, gint width, gint height, gint *composite_x_offset, gint *composite_y_offset) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); *composite_x_offset = 0; *composite_y_offset = 0; return g_object_ref (drawable); } /** * gdk_drawable_get_clip_region: * @drawable: a #GdkDrawable * * Computes the region of a drawable that potentially can be written * to by drawing primitives. This region will not take into account * the clip region for the GC, and may also not take into account * other factors such as if the window is obscured by other windows, * but no area outside of this region will be affected by drawing * primitives. * * Return value: a #GdkRegion. This must be freed with gdk_region_destroy() * when you are done. **/ GdkRegion * gdk_drawable_get_clip_region (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->get_clip_region (drawable); } /** * gdk_drawable_get_visible_region: * @drawable: * * Computes the region of a drawable that is potentially visible. * This does not necessarily take into account if the window is * obscured by other windows, but no area outside of this region * is visible. * * Return value: a #GdkRegion. This must be freed with gdk_region_destroy() * when you are done. **/ GdkRegion * gdk_drawable_get_visible_region (GdkDrawable *drawable) { g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->get_visible_region (drawable); } static GdkRegion * gdk_drawable_real_get_visible_region (GdkDrawable *drawable) { GdkRectangle rect; rect.x = 0; rect.y = 0; gdk_drawable_get_size (drawable, &rect.width, &rect.height); return gdk_region_rectangle (&rect); } /** * gdk_drawable_set_cairo_target: * @drawable: a #GdkDrawable * @cr: a cairo context * * Sets the given drawable as the target surface for a Cairo context. * Note that when @drawable is a window and gdk_window_begin_paint() * has been called, the target surface will be set to the temporary * backing pixmap, so you can only use the Cairo context until * the matching call to gdk_window_end_paint(). * * Since: 2.10 **/ void gdk_drawable_set_cairo_target (GdkDrawable *drawable, cairo_t *cr) { g_return_if_fail (GDK_IS_DRAWABLE (drawable)); g_return_if_fail (cr != NULL); return GDK_DRAWABLE_GET_CLASS (drawable)->set_cairo_target (drawable, cr); } static void composite (guchar *src_buf, gint src_rowstride, guchar *dest_buf, gint dest_rowstride, gint width, gint height) { guchar *src = src_buf; guchar *dest = dest_buf; while (height--) { gint twidth = width; guchar *p = src; guchar *q = dest; while (twidth--) { guchar a = p[3]; guint t; t = a * p[0] + (255 - a) * q[0] + 0x80; q[0] = (t + (t >> 8)) >> 8; t = a * p[1] + (255 - a) * q[1] + 0x80; q[1] = (t + (t >> 8)) >> 8; t = a * p[2] + (255 - a) * q[2] + 0x80; q[2] = (t + (t >> 8)) >> 8; p += 4; q += 3; } src += src_rowstride; dest += dest_rowstride; } } static void composite_0888 (guchar *src_buf, gint src_rowstride, guchar *dest_buf, gint dest_rowstride, GdkByteOrder dest_byte_order, gint width, gint height) { guchar *src = src_buf; guchar *dest = dest_buf; while (height--) { gint twidth = width; guchar *p = src; guchar *q = dest; if (dest_byte_order == GDK_LSB_FIRST) { while (twidth--) { guint t; t = p[3] * p[2] + (255 - p[3]) * q[0] + 0x80; q[0] = (t + (t >> 8)) >> 8; t = p[3] * p[1] + (255 - p[3]) * q[1] + 0x80; q[1] = (t + (t >> 8)) >> 8; t = p[3] * p[0] + (255 - p[3]) * q[2] + 0x80; q[2] = (t + (t >> 8)) >> 8; p += 4; q += 4; } } else { while (twidth--) { guint t; t = p[3] * p[0] + (255 - p[3]) * q[1] + 0x80; q[1] = (t + (t >> 8)) >> 8; t = p[3] * p[1] + (255 - p[3]) * q[2] + 0x80; q[2] = (t + (t >> 8)) >> 8; t = p[3] * p[2] + (255 - p[3]) * q[3] + 0x80; q[3] = (t + (t >> 8)) >> 8; p += 4; q += 4; } } src += src_rowstride; dest += dest_rowstride; } } static void composite_565 (guchar *src_buf, gint src_rowstride, guchar *dest_buf, gint dest_rowstride, GdkByteOrder dest_byte_order, gint width, gint height) { guchar *src = src_buf; guchar *dest = dest_buf; while (height--) { gint twidth = width; guchar *p = src; gushort *q = (gushort *)dest; while (twidth--) { guchar a = p[3]; guint tr, tg, tb; guint tr1, tg1, tb1; guint tmp = *q; #if 1 /* This is fast, and corresponds to what composite() above does * if we converted to 8-bit first. */ tr = (tmp & 0xf800); tr1 = a * p[0] + (255 - a) * ((tr >> 8) + (tr >> 13)) + 0x80; tg = (tmp & 0x07e0); tg1 = a * p[1] + (255 - a) * ((tg >> 3) + (tg >> 9)) + 0x80; tb = (tmp & 0x001f); tb1 = a * p[2] + (255 - a) * ((tb << 3) + (tb >> 2)) + 0x80; *q = (((tr1 + (tr1 >> 8)) & 0xf800) | (((tg1 + (tg1 >> 8)) & 0xfc00) >> 5) | ((tb1 + (tb1 >> 8)) >> 11)); #else /* This version correspond to the result we get with XRENDER - * a bit of precision is lost since we convert to 8 bit after premultiplying * instead of at the end */ guint tr2, tg2, tb2; guint tr3, tg3, tb3; tr = (tmp & 0xf800); tr1 = (255 - a) * ((tr >> 8) + (tr >> 13)) + 0x80; tr2 = a * p[0] + 0x80; tr3 = ((tr1 + (tr1 >> 8)) >> 8) + ((tr2 + (tr2 >> 8)) >> 8); tg = (tmp & 0x07e0); tg1 = (255 - a) * ((tg >> 3) + (tg >> 9)) + 0x80; tg2 = a * p[0] + 0x80; tg3 = ((tg1 + (tg1 >> 8)) >> 8) + ((tg2 + (tg2 >> 8)) >> 8); tb = (tmp & 0x001f); tb1 = (255 - a) * ((tb << 3) + (tb >> 2)) + 0x80; tb2 = a * p[0] + 0x80; tb3 = ((tb1 + (tb1 >> 8)) >> 8) + ((tb2 + (tb2 >> 8)) >> 8); *q = (((tr3 & 0xf8) << 8) | ((tg3 & 0xfc) << 3) | ((tb3 >> 3))); #endif p += 4; q++; } src += src_rowstride; dest += dest_rowstride; } } static void gdk_drawable_real_draw_pixbuf (GdkDrawable *drawable, GdkGC *gc, GdkPixbuf *pixbuf, gint src_x, gint src_y, gint dest_x, gint dest_y, gint width, gint height, GdkRgbDither dither, gint x_dither, gint y_dither) { GdkPixbuf *composited = NULL; gint dwidth, dheight; GdkRegion *clip; GdkRegion *drect; GdkRectangle tmp_rect; g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); g_return_if_fail (pixbuf->colorspace == GDK_COLORSPACE_RGB); g_return_if_fail (pixbuf->n_channels == 3 || pixbuf->n_channels == 4); g_return_if_fail (pixbuf->bits_per_sample == 8); g_return_if_fail (drawable != NULL); if (width == -1) width = pixbuf->width; if (height == -1) height = pixbuf->height; g_return_if_fail (width >= 0 && height >= 0); g_return_if_fail (src_x >= 0 && src_x + width <= pixbuf->width); g_return_if_fail (src_y >= 0 && src_y + height <= pixbuf->height); /* Clip to the drawable; this is required for get_from_drawable() so * can't be done implicitly */ if (dest_x < 0) { src_x -= dest_x; width += dest_x; dest_x = 0; } if (dest_y < 0) { src_y -= dest_y; height += dest_y; dest_y = 0; } gdk_drawable_get_size (drawable, &dwidth, &dheight); if ((dest_x + width) > dwidth) width = dwidth - dest_x; if ((dest_y + height) > dheight) height = dheight - dest_y; if (width <= 0 || height <= 0) return; /* Clip to the clip region; this avoids getting more * image data from the server than we need to. */ tmp_rect.x = dest_x; tmp_rect.y = dest_y; tmp_rect.width = width; tmp_rect.height = height; drect = gdk_region_rectangle (&tmp_rect); clip = gdk_drawable_get_clip_region (drawable); gdk_region_intersect (drect, clip); gdk_region_get_clipbox (drect, &tmp_rect); gdk_region_destroy (drect); gdk_region_destroy (clip); if (tmp_rect.width == 0 || tmp_rect.height == 0) return; /* Actually draw */ if (!gc) gc = _gdk_drawable_get_scratch_gc (drawable, FALSE); if (pixbuf->has_alpha) { GdkVisual *visual = gdk_drawable_get_visual (drawable); void (*composite_func) (guchar *src_buf, gint src_rowstride, guchar *dest_buf, gint dest_rowstride, GdkByteOrder dest_byte_order, gint width, gint height) = NULL; /* First we see if we have a visual-specific composition function that can composite * the pixbuf data directly onto the image */ if (visual) { gint bits_per_pixel = _gdk_windowing_get_bits_for_depth (gdk_drawable_get_display (drawable), visual->depth); if (visual->byte_order == (G_BYTE_ORDER == G_BIG_ENDIAN ? GDK_MSB_FIRST : GDK_LSB_FIRST) && visual->depth == 16 && visual->red_mask == 0xf800 && visual->green_mask == 0x07e0 && visual->blue_mask == 0x001f) composite_func = composite_565; else if (visual->depth == 24 && bits_per_pixel == 32 && visual->red_mask == 0xff0000 && visual->green_mask == 0x00ff00 && visual->blue_mask == 0x0000ff) composite_func = composite_0888; } /* We can't use our composite func if we are required to dither */ if (composite_func && !(dither == GDK_RGB_DITHER_MAX && visual->depth != 24)) { gint x0, y0; for (y0 = 0; y0 < height; y0 += GDK_SCRATCH_IMAGE_HEIGHT) { gint height1 = MIN (height - y0, GDK_SCRATCH_IMAGE_HEIGHT); for (x0 = 0; x0 < width; x0 += GDK_SCRATCH_IMAGE_WIDTH) { gint xs0, ys0; gint width1 = MIN (width - x0, GDK_SCRATCH_IMAGE_WIDTH); GdkImage *image = _gdk_image_get_scratch (gdk_drawable_get_screen (drawable), width1, height1, gdk_drawable_get_depth (drawable), &xs0, &ys0); gdk_drawable_copy_to_image (drawable, image, dest_x + x0, dest_y + y0, xs0, ys0, width1, height1); (*composite_func) (pixbuf->pixels + (src_y + y0) * pixbuf->rowstride + (src_x + x0) * 4, pixbuf->rowstride, (guchar*)image->mem + ys0 * image->bpl + xs0 * image->bpp, image->bpl, visual->byte_order, width1, height1); gdk_draw_image (drawable, gc, image, xs0, ys0, dest_x + x0, dest_y + y0, width1, height1); } } goto out; } else { /* No special composition func, convert dest to 24 bit RGB data, composite against * that, and convert back. */ composited = gdk_pixbuf_get_from_drawable (NULL, drawable, NULL, dest_x, dest_y, 0, 0, width, height); if (composited) composite (pixbuf->pixels + src_y * pixbuf->rowstride + src_x * 4, pixbuf->rowstride, composited->pixels, composited->rowstride, width, height); } } if (composited) { src_x = 0; src_y = 0; pixbuf = composited; } if (pixbuf->n_channels == 4) { guchar *buf = pixbuf->pixels + src_y * pixbuf->rowstride + src_x * 4; gdk_draw_rgb_32_image_dithalign (drawable, gc, dest_x, dest_y, width, height, dither, buf, pixbuf->rowstride, x_dither, y_dither); } else /* n_channels == 3 */ { guchar *buf = pixbuf->pixels + src_y * pixbuf->rowstride + src_x * 3; gdk_draw_rgb_image_dithalign (drawable, gc, dest_x, dest_y, width, height, dither, buf, pixbuf->rowstride, x_dither, y_dither); } out: if (composited) g_object_unref (composited); } /************************************************************************/ /* Fallback rendering code for anti-aliased trapezoids. Note that this code * is cut-and-pasted (with the substitution of GdkPixbuf for FT_Bitmap) between * here and pangoft2-render.c. */ typedef struct { double y; double x1; double x2; } Position; static void draw_simple_trap (GdkPixbuf *pixbuf, int pixbuf_x, int pixbuf_y, Position *t, Position *b) { guchar *pixels = gdk_pixbuf_get_pixels (pixbuf); int rowstride = gdk_pixbuf_get_rowstride (pixbuf); int pixbuf_width = gdk_pixbuf_get_width (pixbuf); int pixbuf_height = gdk_pixbuf_get_height (pixbuf); int iy = floor (t->y); int x1, x2, x; double dy = b->y - t->y; guchar *dest; if (iy < pixbuf_y || iy >= pixbuf_y + pixbuf_height) return; if (t->x1 < b->x1) x1 = floor (t->x1); else x1 = floor (b->x1); if (t->x2 > b->x2) x2 = ceil (t->x2); else x2 = ceil (b->x2); x1 = CLAMP (x1, pixbuf_x, pixbuf_x + pixbuf_width); x2 = CLAMP (x2, pixbuf_x, pixbuf_x + pixbuf_width); dest = pixels + (iy - pixbuf_y) * rowstride + (x1 - pixbuf_x) * 4; for (x = x1; x < x2; x++, dest += 4) { double top_left = MAX (t->x1, x); double top_right = MIN (t->x2, x + 1); double bottom_left = MAX (b->x1, x); double bottom_right = MIN (b->x2, x + 1); double c = 0.5 * dy * ((top_right - top_left) + (bottom_right - bottom_left)); /* When converting to [0,255], we round up. This is intended * to prevent the problem of pixels that get divided into * multiple slices not being fully black. */ int ic = c * 256; /* We already set the entire buffer to the destination color */ dest[3] = MIN (dest[3] + ic, 255); } } static void interpolate_position (Position *result, Position *top, Position *bottom, double val, double val1, double val2) { result->y = (top->y * (val2 - val) + bottom->y * (val - val1)) / (val2 - val1); result->x1 = (top->x1 * (val2 - val) + bottom->x1 * (val - val1)) / (val2 - val1); result->x2 = (top->x2 * (val2 - val) + bottom->x2 * (val - val1)) / (val2 - val1); } /* This draws a trapezoid with the parallel sides aligned with * the X axis. We do this by subdividing the trapezoid vertically * into thin slices (themselves trapezoids) where two edge sides are each * contained within a single pixel and then rasterizing each * slice. There are frequently multiple slices within a single * line so we have to accumulate to get the final result. */ static void draw_trapezoid (GdkPixbuf *pixbuf, int pixbuf_x, int pixbuf_y, GdkTrapezoid *trapezoid) { Position pos; Position t; Position b; gboolean done = FALSE; if (trapezoid->y1 == trapezoid->y2) return; pos.y = t.y = trapezoid->y1; pos.x1 = t.x1 = trapezoid->x11; pos.x2 = t.x2 = trapezoid->x21; b.y = trapezoid->y2; b.x1 = trapezoid->x12; b.x2 = trapezoid->x22; while (!done) { Position pos_next; double y_next, x1_next, x2_next; double ix1, ix2; /* The algorithm here is written to emphasize simplicity and * numerical stability as opposed to speed. * * While the end result is slicing up the polygon vertically, * conceptually we aren't walking in the X direction, rather we * are walking along the edges. When we compute crossing of * horizontal pixel boundaries, we use the X coordinate as the * interpolating variable, when we compute crossing for vertical * pixel boundaries, we use the Y coordinate. * * This allows us to handle almost exactly horizontal edges without * running into difficulties. (Almost exactly horizontal edges * come up frequently due to inexactness in computing, say, * a 90 degree rotation transformation) */ pos_next = b; done = TRUE; /* Check for crossing vertical pixel boundaries */ y_next = floor (pos.y) + 1; if (y_next < pos_next.y) { interpolate_position (&pos_next, &t, &b, y_next, t.y, b.y); pos_next.y = y_next; done = FALSE; } /* Check left side for crossing horizontal pixel boundaries */ ix1 = floor (pos.x1); if (b.x1 < t.x1) { if (ix1 == pos.x1) x1_next = ix1 - 1; else x1_next = ix1; if (x1_next > pos_next.x1) { interpolate_position (&pos_next, &t, &b, x1_next, t.x1, b.x1); pos_next.x1 = x1_next; done = FALSE; } } else if (b.x1 > t.x1) { x1_next = ix1 + 1; if (x1_next < pos_next.x1) { interpolate_position (&pos_next, &t, &b, x1_next, t.x1, b.x1); pos_next.x1 = x1_next; done = FALSE; } } /* Check right side for crossing horizontal pixel boundaries */ ix2 = floor (pos.x2); if (b.x2 < t.x2) { if (ix2 == pos.x2) x2_next = ix2 - 1; else x2_next = ix2; if (x2_next > pos_next.x2) { interpolate_position (&pos_next, &t, &b, x2_next, t.x2, b.x2); pos_next.x2 = x2_next; done = FALSE; } } else if (trapezoid->x22 > trapezoid->x21) { x2_next = ix2 + 1; if (x2_next < pos_next.x2) { interpolate_position (&pos_next, &t, &b, x2_next, t.x2, b.x2); pos_next.x2 = x2_next; done = FALSE; } } draw_simple_trap (pixbuf, pixbuf_x, pixbuf_y, &pos, &pos_next); pos = pos_next; } } static void gdk_drawable_real_draw_trapezoids (GdkDrawable *drawable, GdkGC *gc, GdkTrapezoid *trapezoids, gint n_trapezoids) { GdkPixbuf *pixbuf; double min_x, max_x, min_y, max_y; int x, y, width, height; GdkColor color; int i; if (n_trapezoids == 0) return; /* compute bounding box */ min_x = max_x = trapezoids[0].x11; min_y = max_y = trapezoids[0].y1; for (i = 0; i < n_trapezoids; i++) { if (trapezoids[i].x11 < min_x) min_x = trapezoids[i].x11; if (trapezoids[i].x21 > max_x) max_x = trapezoids[i].x21; if (trapezoids[i].x12 < min_x) min_x = trapezoids[i].x12; if (trapezoids[i].x22 > max_x) max_x = trapezoids[i].x22; if (trapezoids[i].y1 < min_y) min_y = trapezoids[i].y1; if (trapezoids[i].y2 > max_y) max_y = trapezoids[i].y2; } /* allocate temporary pixbuf */ x = floor (min_x); width = ceil (max_x) - x; y = floor (min_y); height = ceil (max_y) - y; if (width == 0 || height == 0) return; pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height); if (!pixbuf) return; /* Fill the pixbuf with the foreground color and alpha 0 */ _gdk_windowing_gc_get_foreground (gc, &color); gdk_pixbuf_fill (pixbuf, (((color.red & 0xff00) << 16) | ((color.green & 0xff00) << 8) | ((color.blue & 0xff00)))); /* draw the trapezoids into the alpha channel */ for (i = 0; i < n_trapezoids; i++) draw_trapezoid (pixbuf, x, y, &trapezoids[i]); /* composite that onto the drawable */ gdk_draw_pixbuf (drawable, gc, pixbuf, 0, 0, x, y, width, height, GDK_RGB_DITHER_NORMAL, 0, 0); g_object_unref (pixbuf); } /************************************************************************/ /** * _gdk_drawable_get_scratch_gc: * @drawable: A #GdkDrawable * @graphics_exposures: Whether the returned #GdkGC should generate graphics exposures * * Returns a #GdkGC suitable for drawing on @drawable. The #GdkGC has * the standard values for @drawable, except for the graphics_exposures * field which is determined by the @graphics_exposures parameter. * * The foreground color of the returned #GdkGC is undefined. The #GdkGC * must not be altered in any way, except to change its foreground color. * * Return value: A #GdkGC suitable for drawing on @drawable * * Since: 2.4 **/ GdkGC * _gdk_drawable_get_scratch_gc (GdkDrawable *drawable, gboolean graphics_exposures) { GdkScreen *screen; gint depth; g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL); screen = gdk_drawable_get_screen (drawable); g_return_val_if_fail (!screen->closed, NULL); depth = gdk_drawable_get_depth (drawable) - 1; if (graphics_exposures) { if (!screen->exposure_gcs[depth]) { GdkGCValues values; GdkGCValuesMask mask; values.graphics_exposures = TRUE; mask = GDK_GC_EXPOSURES; screen->exposure_gcs[depth] = gdk_gc_new_with_values (drawable, &values, mask); } return screen->exposure_gcs[depth]; } else { if (!screen->normal_gcs[depth]) { screen->normal_gcs[depth] = gdk_gc_new (drawable); } return screen->normal_gcs[depth]; } }