forked from AuroraMiddleware/gtk
In docs, explain what a dither offset is for.
1999-11-04 Havoc Pennington <hp@pobox.com> * src/gdk-pixbuf-render.c (gdk_pixbuf_render_to_drawable): In docs, explain what a dither offset is for. (gdk_pixbuf_render_to_drawable_alpha): Explain why you would use this function vs. gdk_pixbuf_render_to_drawable().
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@ -1,3 +1,10 @@
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1999-11-04 Havoc Pennington <hp@pobox.com>
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* src/gdk-pixbuf-render.c (gdk_pixbuf_render_to_drawable): In
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docs, explain what a dither offset is for.
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(gdk_pixbuf_render_to_drawable_alpha): Explain why you would use
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this function vs. gdk_pixbuf_render_to_drawable().
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1999-11-04 Havoc Pennington <hp@pobox.com>
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* configure.in: Use libart-config correctly; find gnome-config
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@ -43,6 +43,7 @@
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* Takes the opacity values in a rectangular portion of a pixbuf and thresholds
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* them to produce a bi-level alpha mask that can be used as a clipping mask for
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* a drawable.
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*
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**/
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void
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gdk_pixbuf_render_threshold_alpha (GdkPixbuf *pixbuf, GdkBitmap *bitmap,
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@ -174,6 +175,11 @@ remove_alpha (ArtPixBuf *apb, int x, int y, int width, int height, int *rowstrid
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* the GdkRGB visual and colormap. Note that this function will ignore the
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* opacity information for images with an alpha channel; the GC must already
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* have the clipping mask set if you want transparent regions to show through.
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*
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* For an explanation of dither offsets, see the GdkRGB documentation. In brief, the
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* dither offset is important when scrolling (so you can redraw half an image but keep the
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* dithering "lined up" between the part you drew first and the part you drew previously).
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* For unscrolled images, the offset can always be 0.
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**/
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void
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gdk_pixbuf_render_to_drawable (GdkPixbuf *pixbuf,
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@ -247,6 +253,13 @@ gdk_pixbuf_render_to_drawable (GdkPixbuf *pixbuf,
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*
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* Renders a rectangular portion of a pixbuf to a drawable. This is done using
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* GdkRGB, so the specified drawable must have the GdkRGB visual and colormap.
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*
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* This function has a performance penalty; it makes two synchronous
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* round trips to the X server (creating a bitmask and a GC), and it
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* draws the contents of the bitmask. If performance is crucial,
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* consider handling alpha yourself and using
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* gdk_pixbuf_render_to_drawable(). On the other hand it's more convenient
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* than gdk_pixbuf_render_to_drawable() because it handles the alpha channel.
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**/
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void
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gdk_pixbuf_render_to_drawable_alpha (GdkPixbuf *pixbuf, GdkDrawable *drawable,
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