diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/plotters.c | 84 |
1 files changed, 47 insertions, 37 deletions
diff --git a/src/plotters.c b/src/plotters.c index 4a7598e..3099768 100644 --- a/src/plotters.c +++ b/src/plotters.c @@ -1,3 +1,12 @@ +/* + * Copyright 2009 Vincent Sanders <vince@simtec.co.uk> + * Copyright 2009 Michael Drake <tlsa@netsurf-browser.org> + * + * This file is part of libnsfb, http://www.netsurf-browser.org/ + * Licenced under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + */ + /* generic plotter functions which are not depth dependant */ #include <stdbool.h> @@ -31,18 +40,18 @@ static bool set_clip(nsfb_t *nsfb, nsfb_bbox_t *clip) if (clip == NULL) { nsfb->clip = fbarea; } else { - if (!nsfb_plot_clip(&fbarea, clip)) + if (!nsfb_plot_clip(&fbarea, clip)) return false; nsfb->clip = *clip; } - return true; + return true; } static bool get_clip(nsfb_t *nsfb, nsfb_bbox_t *clip) { *clip = nsfb->clip; - return true; + return true; } static bool clg(nsfb_t *nsfb, nsfb_colour_t c) @@ -51,15 +60,15 @@ static bool clg(nsfb_t *nsfb, nsfb_colour_t c) } /** - * Find find first filled span along horizontal line at given coordinate + * Find first filled span along horizontal line at given coordinate * - * \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN) - * \param n number of polygon vertex values (N * 2) - * \param x current position along current scan line - * \param y position of current scan line - * \param x0 updated to start of filled area - * \param x1 updated to end of filled area - * \return true if an intersection was found + * \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN) + * \param n number of polygon vertex values (N * 2) + * \param x current position along current scan line + * \param y position of current scan line + * \param x0 updated to start of filled area + * \param x1 updated to end of filled area + * \return true if an intersection was found */ static bool find_span(const int *p, int n, int x, int y, int *x0, int *x1) { @@ -79,8 +88,8 @@ static bool find_span(const int *p, int n, int x, int y, int *x0, int *x1) p_x1 = p[i + 2]; p_y1 = p[i + 3]; } else { /* last line; 2nd endpoint is first vertex */ - p_x0 = p[i]; p_y0 = p[i + 1]; - p_x1 = p[0]; p_y1 = p[1]; + p_x0 = p[i]; p_y0 = p[i + 1]; + p_x1 = p[0]; p_y1 = p[1]; } /* ignore horizontal lines */ if (p_y0 == p_y1) @@ -137,11 +146,11 @@ static bool find_span(const int *p, int n, int x, int y, int *x0, int *x1) /** * Plot a polygon * - * \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN) - * \param n number of polygon vertices (N) - * \param c fill colour - * \param linefn function to call to plot a horizontal line - * \return true if no errors + * \param nsfb frambuffer context + * \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN) + * \param n number of polygon vertices (N) + * \param c fill colour + * \return true if no errors */ static bool polygon(nsfb_t *nsfb, const int *p, unsigned int n, nsfb_colour_t c) { @@ -151,7 +160,7 @@ static bool polygon(nsfb_t *nsfb, const int *p, unsigned int n, nsfb_colour_t c) int x0, x1; /* filled span extents */ int y; /* current y coordinate */ int y_max; /* bottom of plot area */ - nsfb_bbox_t fline; + nsfb_bbox_t fline; /* find no. of vertex values */ int v = n * 2; @@ -176,9 +185,9 @@ static bool polygon(nsfb_t *nsfb, const int *p, unsigned int n, nsfb_colour_t c) } /* Don't try to plot it if it's outside the clip rectangle */ - if (nsfb->clip.y1 < poly_y0 || + if (nsfb->clip.y1 < poly_y0 || nsfb->clip.y0 > poly_y1 || - nsfb->clip.x1 < poly_x0 || + nsfb->clip.x1 < poly_x0 || nsfb->clip.x0 > poly_x1) return true; @@ -208,13 +217,14 @@ static bool polygon(nsfb_t *nsfb, const int *p, unsigned int n, nsfb_colour_t c) else if (x1 > nsfb->clip.x1) x1 = nsfb->clip.x1; - fline.x0 = x0; - fline.y0 = y; - fline.x1 = x1; - fline.y1 = y; + fline.x0 = x0; + fline.y0 = y; + fline.x1 = x1; + fline.y1 = y; /* draw this filled span on current row */ - nsfb->plotter_fns->line(nsfb, &fline, 1, c, false, false); + nsfb->plotter_fns->line(nsfb, &fline, 1, c, false, + false); /* don't look for more spans if already at end of clip * region or polygon */ @@ -228,8 +238,8 @@ static bool polygon(nsfb_t *nsfb, const int *p, unsigned int n, nsfb_colour_t c) return true; } -static bool rectangle(nsfb_t *nsfb, nsfb_bbox_t *rect, - int line_width, nsfb_colour_t c, +static bool rectangle(nsfb_t *nsfb, nsfb_bbox_t *rect, + int line_width, nsfb_colour_t c, bool dotted, bool dashed) { nsfb_bbox_t side; @@ -281,11 +291,11 @@ static void ellipsefill(nsfb_t *nsfb, int cx, int cy, int x, int y, nsfb_colour_ #define ROUND(a) ((int)(a+0.5)) -static bool ellipse_midpoint(nsfb_t *nsfb, - int cx, - int cy, - int rx, - int ry, +static bool ellipse_midpoint(nsfb_t *nsfb, + int cx, + int cy, + int rx, + int ry, nsfb_colour_t c, void (ellipsefn)(nsfb_t *nsfb, int cx, int cy, int x, int y, nsfb_colour_t c)) { @@ -371,10 +381,10 @@ static void circlefill(nsfb_t *nsfb, int cx, int cy, int x, int y, nsfb_colour_t nsfb->plotter_fns->line(nsfb, &fline, 1, c, false, false); } -static bool circle_midpoint(nsfb_t *nsfb, - int cx, - int cy, - int r, +static bool circle_midpoint(nsfb_t *nsfb, + int cx, + int cy, + int r, nsfb_colour_t c, void (circfn)(nsfb_t *nsfb, int cx, int cy, int x, int y, nsfb_colour_t c)) { |