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Diffstat (limited to 'include/libnsfb_plot_util.h')
-rw-r--r-- | include/libnsfb_plot_util.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/libnsfb_plot_util.h b/include/libnsfb_plot_util.h new file mode 100644 index 0000000..a1b0159 --- /dev/null +++ b/include/libnsfb_plot_util.h @@ -0,0 +1,40 @@ +/* + * Copyright 2009 Vincent Sanders <vince@simtec.co.uk> + * + * This file is part of libnsfb, http://www.netsurf-browser.org/ + * Licenced under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + * + * This is the exported interface for the libnsfb graphics library. + */ + +#ifndef _LIBNSFB_PLOT_UTIL_H +#define _LIBNSFB_PLOT_UTIL_H 1 + + +/* alpha blend two pixels together */ +static inline nsfb_colour_t +nsfb_plot_ablend(nsfb_colour_t pixel, nsfb_colour_t scrpixel) +{ + int opacity = pixel >> 24; + int transp = 0x100 - opacity; + uint32_t rb, g; + + rb = ((pixel & 0xFF00FF) * opacity + + (scrpixel & 0xFF00FF) * transp) >> 8; + g = ((pixel & 0x00FF00) * opacity + + (scrpixel & 0x00FF00) * transp) >> 8; + + return (rb & 0xFF00FF) | (g & 0xFF00); +} + + +bool nsfb_plot_clip(const nsfb_bbox_t * restrict clip, nsfb_bbox_t * restrict rect); + +bool nsfb_plot_clip_ctx(nsfb_t *nsfb, nsfb_bbox_t * restrict rect); + +bool nsfb_plot_clip_line(const nsfb_bbox_t * restrict clip, nsfb_bbox_t * restrict line); + +bool nsfb_plot_clip_line_ctx(nsfb_t *nsfb, nsfb_bbox_t * restrict line); + +#endif /* _LIBNSFB_PLOT_UTIL_H */ |