118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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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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/** \file
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* Target independent plotting (interface).
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*/
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#ifndef _NETSURF_DESKTOP_PLOTTERS_H_
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#define _NETSURF_DESKTOP_PLOTTERS_H_
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#include <stdbool.h>
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#include "css/css.h"
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#include "content/content.h"
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struct bitmap;
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/** Set of target specific plotting functions.
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*
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* The functions are:
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* clg - Clears plotting area to a flat colour (if needed)
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* arc - Plots an arc, around (x,y), from anticlockwise from angle1 to
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* angle2. Angles are measured anticlockwise from horizontal, in
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* degrees.
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* disc - Plots a circle, centered on (x,y), which is optionally filled.
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* line - Plots a line from (x0,y0) to (x1,y1). Coordinates are at
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* centre of line width/thickness.
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* path -
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* polygon - Plots a filled polygon with straight lines between points.
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* The lines around the edge of the ploygon are not plotted. The
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* polygon is filled with the non-zero winding rule.
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* rectangle - Plots a rectangle outline. The line can be solid, dotted or
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* dashed.
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* fill - Plots a filled rectangle.
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* clip -
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* text -
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* bitmap -
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* bitmap_tile -
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* group_start - Start of a group of objects. Used when plotter implements
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* export to a vector graphics file format. (Optional.)
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* group_end - End of the most recently started group. (Optional.)
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* flush - Only used internally by the knockout code. Should be NULL in
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* any front end display plotters or export plotters.
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*
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* Plotter options:
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* option_knockout - Optimisation particularly for unaccelerated screen
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* redraw. It tries to avoid plotting to the same area
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* more than once. See desktop/knockout.c
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*
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* Coordinates are from top left and (0,0) is the top left grid denomination.
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* If a "fill" is drawn from (0,0) to (4,3), the result is:
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*
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* 0 1 2 3 4 5
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* +-+-+-+-+-+-
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* 0 |#|#|#|#| |
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* +-+-+-+-+-+-
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* 1 |#|#|#|#| |
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* +-+-+-+-+-+-
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* 2 |#|#|#|#| |
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* +-+-+-+-+-+-
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* 3 | | | | | |
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*/
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struct plotter_table {
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bool (*clg)(colour c);
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bool (*rectangle)(int x0, int y0, int width, int height,
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int line_width, colour c, bool dotted, bool dashed);
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bool (*line)(int x0, int y0, int x1, int y1, int width,
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colour c, bool dotted, bool dashed);
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bool (*polygon)(const int *p, unsigned int n, colour fill);
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bool (*fill)(int x0, int y0, int x1, int y1, colour c);
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bool (*clip)(int x0, int y0, int x1, int y1);
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bool (*text)(int x, int y, const struct css_style *style,
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const char *text, size_t length, colour bg, colour c);
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bool (*disc)(int x, int y, int radius, colour c, bool filled);
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bool (*arc)(int x, int y, int radius, int angle1, int angle2, colour c);
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bool (*bitmap)(int x, int y, int width, int height,
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struct bitmap *bitmap, colour bg,
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struct content *content);
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bool (*bitmap_tile)(int x, int y, int width, int height,
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struct bitmap *bitmap, colour bg,
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bool repeat_x, bool repeat_y, struct content *content);
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bool (*group_start)(const char *name); /**< optional, may be NULL */
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bool (*group_end)(void); /**< optional, may be NULL */
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bool (*flush)(void); /**< optional, may be NULL */
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bool (*path)(const float *p, unsigned int n, colour fill, float width,
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colour c, const float transform[6]);
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bool option_knockout; /**< set if knockout rendering is required */
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};
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/** Current plotters, must be assigned before use. */
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extern struct plotter_table plot;
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enum path_command {
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PLOTTER_PATH_MOVE,
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PLOTTER_PATH_CLOSE,
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PLOTTER_PATH_LINE,
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PLOTTER_PATH_BEZIER,
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};
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#endif
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