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author | Vincent Sanders <vince@netsurf-browser.org> | 2009-04-08 10:17:09 +0000 |
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committer | Vincent Sanders <vince@netsurf-browser.org> | 2009-04-08 10:17:09 +0000 |
commit | 056e1ebed94379db41ebb2e40cc88a873cfb4411 (patch) | |
tree | d1d01c4b9f9d4c2c2b1db4b705e631d49cf2e6b0 /include/plot_util.h | |
download | libnsfb-056e1ebed94379db41ebb2e40cc88a873cfb4411.tar.gz libnsfb-056e1ebed94379db41ebb2e40cc88a873cfb4411.tar.bz2 |
initial commit of netsurf framebuffer library
svn path=/trunk/libnsfb/; revision=7060
Diffstat (limited to 'include/plot_util.h')
-rw-r--r-- | include/plot_util.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/plot_util.h b/include/plot_util.h new file mode 100644 index 0000000..6565cb1 --- /dev/null +++ b/include/plot_util.h @@ -0,0 +1,24 @@ +/* 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); |