mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-26 05:57:00 +03:00
89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
/*
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* Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FRAMEBUFFER_PLOTTERS_H
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#define FRAMEBUFFER_PLOTTERS_H
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extern const struct plotter_table framebuffer_1bpp_plot;
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extern const struct plotter_table framebuffer_8bpp_plot;
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extern const struct plotter_table framebuffer_16bpp_plot;
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extern const struct plotter_table framebuffer_32bpp_plot;
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/* plotting context */
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extern bbox_t fb_plot_ctx;
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/* plotter support functions */
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bool fb_plotters_clip_rect_ctx(int *x0, int *y0, int *x1, int *y1);
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bool fb_plotters_clip_rect(const bbox_t *clip, int *x0, int *y0, int *x1, int *y1);
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bool fb_plotters_clip_line_ctx(int *x0, int *y0, int *x1, int *y1);
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bool fb_plotters_clip_line(const bbox_t *clip, int *x0, int *y0, int *x1, int *y1);
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bool fb_plotters_polygon(const int *p, unsigned int n, colour fill, bool (linefn)(int x0, int y0, int x1, int y1, int width, colour c, bool dotted, bool dashed));
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bool fb_plotters_bitmap_tile(int x, int y,
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int width, int height,
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struct bitmap *bitmap, colour bg,
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bool repeat_x, bool repeat_y,
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struct content *content,
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bool (bitmapfn)(int x, int y,
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int width, int height,
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struct bitmap *bitmap,
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colour bg,
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struct content *content));
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/* alpha blend two pixels together */
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static inline colour fb_plotters_ablend(colour pixel, colour scrpixel)
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{
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#if 1
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int opacity = (pixel >> 24) & 0xFF;
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int r,g,b;
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r = (((pixel & 0xFF) * opacity) >> 8) +
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(((scrpixel & 0xFF) * (0xFF - opacity)) >> 8);
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g = ((((pixel & 0xFF00) >> 8) * opacity) >> 8) +
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((((scrpixel & 0xFF00) >> 8) * (0xFF - opacity)) >> 8);
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b = ((((pixel & 0xFF0000) >> 16) * opacity) >> 8) +
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((((scrpixel & 0xFF0000) >> 16) * (0xFF - opacity)) >> 8);
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return r | (g << 8) | (b << 16);
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#else
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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 | g;
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#endif
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}
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bool fb_plotters_move_block(int srcx, int srcy, int width, int height, int dstx, int dsty);
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/* generic plotter entry points */
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bool fb_clip(int x0, int y0, int x1, int y1);
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#endif
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