49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
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/*
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* Copyright 2009 Vincent Sanders <vince@simtec.co.uk>
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*
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* This file is part of libnsfb, http://www.netsurf-browser.org/
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* Licenced under the MIT License,
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* http://www.opensource.org/licenses/mit-license.php
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*
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* This is the exported interface for the libnsfb graphics library.
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*/
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#ifndef _LIBNSFB_PLOT_UTIL_H
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#define _LIBNSFB_PLOT_UTIL_H 1
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/* alpha blend two pixels together */
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static inline nsfb_colour_t
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nsfb_plot_ablend(nsfb_colour_t pixel, nsfb_colour_t scrpixel)
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{
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int opacity = pixel >> 24;
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int transp = 0x100 - opacity;
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uint32_t rb, g;
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rb = ((pixel & 0xFF00FF) * opacity +
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(scrpixel & 0xFF00FF) * transp) >> 8;
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g = ((pixel & 0x00FF00) * opacity +
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(scrpixel & 0x00FF00) * transp) >> 8;
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return (rb & 0xFF00FF) | (g & 0xFF00);
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}
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bool nsfb_plot_clip(const nsfb_bbox_t * clip, nsfb_bbox_t * rect);
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bool nsfb_plot_clip_ctx(nsfb_t *nsfb, nsfb_bbox_t * rect);
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bool nsfb_plot_clip_line(const nsfb_bbox_t * clip, nsfb_bbox_t * line);
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bool nsfb_plot_clip_line_ctx(nsfb_t *nsfb, nsfb_bbox_t * line);
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/** Obtain a bounding box which is the superset of two source boxes.
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*
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*/
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bool nsfb_plot_add_rect(const nsfb_bbox_t *box1, const nsfb_bbox_t *box2, nsfb_bbox_t *result);
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/** Find if two boxes intersect. */
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bool nsfb_plot_bbox_intersect(const nsfb_bbox_t *box1, const nsfb_bbox_t *box2);
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#endif /* _LIBNSFB_PLOT_UTIL_H */
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