forked from AuroraMiddleware/gtk
5b4c8afa7e
* gdk/gdktypes.h: Add new type GdkSpan * docs/reference/gdk/gdk-sections.txt, docs/reference/gdk/tmpl/regions.sgml, gdk/gdkregion-generic.c, gdk/gdkregion.h: Implement and document gdk_region_spans_intersect_foreach. * gdk/linux-fb/Makefile.am, gdk/linux-fb/gdkrender-fb.c: Add new file gdkrender-fb.c which contains all core rendering code. Add gdk_fb_fill_rectangle_generic (old rectangle code) and gdk_fb_fill_rectangle_simple_16, gdk_fb_fill_rectangle_simple_32 (optimized rectangle fillers). * gdk/linux-fb/gdkdrawable-fb2.c: Move all rendering code to gdkrender-fb.c. Change from using GdkRectangles and GdkSegments for spans to GdkSpan. Use the new span intersection functions in gdk_fb_fill_spans. gdk_fb_draw_rectangle() clips filled rectangles and calls gc->fill_rectangle with the result. gdk_fb_fill_spans() gets extra argument "sorted". * gdk/linux-fb/gdkevents-fb.c: Remove unused includes and defines. New function gdk_fb_get_time() to get correct time for events. * gdk/linux-fb/gdkinput-ps2.c: Use gdk method of generating multiple-clicks (gdk_event_button_generate) Make sure to set the time of all events. * gdk/linux-fb/gdkmain-fb.c: Use gdk_fb_get_time (). * gdk/linux-fb/gdkprivate-fb.h: New virtual GC calls: fill_span & fill_rectangle. Export gdk_fb_get_time(). gdk_fb_fill_spans() gets extra argument "sorted". * gdk/linux-fb/mi*.c: Use GdkSpan instead of GdkRectangle. Pass correct sorted to gdk_fb_fill_spans. (sorted value taken from XFree 4 source)
302 lines
6.3 KiB
Plaintext
302 lines
6.3 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Points, Rectangles and Regions
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<!-- ##### SECTION Short_Description ##### -->
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simple graphical data types.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GDK provides the #GdkPoint, #GdkRectangle, #GdkRegion and #GdkSpan data types
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for representing pixels and sets of pixels on the screen.
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</para>
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<para>
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#GdkPoint is a simple structure containing an x and y coordinate of a point.
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</para>
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<para>
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#GdkRectangle is a structure holding the position and size of a rectangle.
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The intersection of two rectangles can be computed with
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gdk_rectangle_intersect(). To find the union of two rectangles use
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gdk_rectangle_union().
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</para>
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<para>
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#GdkRegion is an opaque data type holding a set of arbitrary pixels, and is
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usually used for clipping graphical operations (see gdk_gc_set_clip_region()).
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</para>
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<para>
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#GdkSpan is a structure holding a spanline. A spanline is a horizontal line that
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is one pixel wide. It is mainly used when rasterizing other graphics primitives.
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It can be intersected to regions by using gdk_region_spans_intersect_foreach().
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### STRUCT GdkPoint ##### -->
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<para>
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</para>
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@x:
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@y:
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<!-- ##### STRUCT GdkRectangle ##### -->
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<para>
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</para>
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@x:
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@y:
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@width:
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@height:
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<!-- ##### FUNCTION gdk_rectangle_intersect ##### -->
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<para>
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</para>
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@src1:
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@src2:
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@dest:
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@Returns:
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<!-- ##### FUNCTION gdk_rectangle_union ##### -->
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<para>
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</para>
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@src1:
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@src2:
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@dest:
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<!-- ##### STRUCT GdkRegion ##### -->
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<para>
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A GdkRegion represents a set of pixels on the screen.
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The only user-visible field of the structure is the user_data member, which
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can be used to attach arbitrary data to the #GdkRegion.
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</para>
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<!-- ##### FUNCTION gdk_region_new ##### -->
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<para>
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Creates a new empty #GdkRegion.
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</para>
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@Returns: a new empty #GdkRegion.
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<!-- ##### FUNCTION gdk_region_polygon ##### -->
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<para>
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Creates a new #GdkRegion using the polygon defined by a number of points.
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</para>
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@points: an array of #GdkPoint structs.
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@npoints: the number of elements in the @points array.
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@fill_rule: specifies which pixels are included in the region when the polygon
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overlaps itself.
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@Returns: a new #GdkRegion based on the given polygon.
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<!-- ##### ENUM GdkFillRule ##### -->
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<para>
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The method for determining which pixels are included in a region, when
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creating a #GdkRegion from a polygon.
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The fill rule is only relevant for polygons which overlap themselves.
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</para>
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@GDK_EVEN_ODD_RULE: areas which are overlapped an odd number of times are
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included in the region, while areas overlapped an even number of times are not.
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@GDK_WINDING_RULE: overlapping areas are always included.
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<!-- ##### FUNCTION gdk_region_copy ##### -->
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<para>
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</para>
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@region:
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@Returns:
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<!-- ##### FUNCTION gdk_region_rectangle ##### -->
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<para>
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</para>
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@rectangle:
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@Returns:
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<!-- ##### FUNCTION gdk_region_destroy ##### -->
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<para>
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Destroys a #GdkRegion.
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</para>
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@region: a #GdkRegion.
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<!-- ##### FUNCTION gdk_region_get_clipbox ##### -->
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<para>
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Returns the smallest rectangle which includes the entire #GdkRegion.
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</para>
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@region: a #GdkRegion.
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@rectangle: returns the smallest rectangle which includes all of @region.
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<!-- ##### FUNCTION gdk_region_empty ##### -->
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<para>
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Returns TRUE if the #GdkRegion is empty.
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</para>
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@region: a #GdkRegion.
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@Returns: TRUE if @region is empty.
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<!-- ##### FUNCTION gdk_region_equal ##### -->
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<para>
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Returns TRUE if the two regions are the same.
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</para>
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@region1: a #GdkRegion.
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@region2: a #GdkRegion.
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@Returns: TRUE if @region1 and @region2 are equal.
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<!-- ##### FUNCTION gdk_region_point_in ##### -->
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<para>
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Returns TRUE if a point is in a region.
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</para>
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@region: a #GdkRegion.
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@x: the x coordinate of a point.
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@y: the y coordinate of a point.
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@Returns: TRUE if the point is in @region.
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<!-- ##### FUNCTION gdk_region_rect_in ##### -->
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<para>
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Tests whether a rectangle is within a region.
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</para>
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@region: a #GdkRegion.
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@rect: a #GdkRectangle.
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@Returns: GDK_OVERLAP_RECTANGLE_IN, GDK_OVERLAP_RECTANGLE_OUT, or
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GDK_OVERLAP_RECTANGLE_PART, depending on whether the rectangle is inside,
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outside, or partly inside the #GdkRegion, respectively.
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<!-- ##### ENUM GdkOverlapType ##### -->
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<para>
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Specifies the possible values returned by gdk_region_rect_in().
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</para>
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@GDK_OVERLAP_RECTANGLE_IN: if the rectangle is inside the #GdkRegion.
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@GDK_OVERLAP_RECTANGLE_OUT: if the rectangle is outside the #GdkRegion.
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@GDK_OVERLAP_RECTANGLE_PART: if the rectangle is partly inside the #GdkRegion.
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<!-- ##### FUNCTION gdk_region_offset ##### -->
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<para>
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Moves a region the specified distance.
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</para>
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@region: a #GdkRegion.
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@dx: the distance to move the region horizontally.
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@dy: the distance to move the region vertically.
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<!-- ##### FUNCTION gdk_region_shrink ##### -->
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<para>
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Resizes a region by the specified amount.
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Positive values shrink the region. Negative values expand it.
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</para>
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@region: a #GdkRegion.
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@dx: the number of pixels to shrink the region horizontally.
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@dy: the number of pixels to shrink the region vertically.
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<!-- ##### FUNCTION gdk_region_union_with_rect ##### -->
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<para>
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Returns the union of a region and a rectangle.
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</para>
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@region: a #GdkRegion.
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@rect: a #GdkRectangle.
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<!-- # Unused Parameters # -->
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@Returns: the union of @region and @rect.
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<!-- ##### FUNCTION gdk_region_intersect ##### -->
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<para>
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</para>
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@source1:
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@source2:
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<!-- ##### FUNCTION gdk_region_union ##### -->
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<para>
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</para>
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@source1:
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@source2:
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<!-- ##### FUNCTION gdk_region_subtract ##### -->
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<para>
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</para>
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@source1:
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@source2:
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<!-- ##### FUNCTION gdk_region_xor ##### -->
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<para>
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</para>
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@source1:
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@source2:
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<!-- ##### STRUCT GdkSpan ##### -->
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<para>
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</para>
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@x:
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@y:
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@width:
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<!-- ##### USER_FUNCTION GdkSpanFunc ##### -->
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<para>
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</para>
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@span: The intersected part of the span.
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@data: Opaque data passed by user.
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<!-- ##### FUNCTION gdk_region_spans_intersect_foreach ##### -->
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<para>
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Intersects a set of spans with a region and call a user specified
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function for each resulting spanline. This function is a lot more effective
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if the spans are sorted.
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</para>
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@region: The region to intersect against.
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@spans: Array of spans to intersect.
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@n_spans: Number of spans.
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@sorted: True if the spans are sorted in increasing y order.
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@function: The function to call for each intersected spanline.
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@data: Opaque user data passed to function.
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