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989df5d2bf
This adds a portable, scanline-based polygon filling algorithm, which fills a polygon by drawing a collection of adjacent horizontal lines. This change is motivated by the Rockbox port's current lack of a true polygon fill capability. Until now, it attempted to approximate a polygon fill by performing a series of triangle fills, but this worked reliably only for convex polygons. I originally considered making this new rasterizer part of the Rockbox front end itself, but I ultimately decided that it made more sense to include it here, in the Puzzles distribution, where other platforms may benefit from it in the future. No in-tree front ends use this new function quite yet, but I plan to follow this commit with a compile-time option to force front ends to use it for testing. This new polygon drawing code also comes with its own standalone driver code to test it out in isolation. This code currently relies on SDL 2.0 to present a GUI window to the user, which unfortunately adds a build-time dependency. To lessen the impact of this change, this program is gated behind a CMake build option. To use it, run: $ cmake -DBUILD_SDL_PROGRAMS=true
81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*
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* nullfe.c: Null front-end code containing a bunch of boring stub
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* functions. Used to ensure successful linking when building the
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* various stand-alone solver binaries.
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*/
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#include <stdarg.h>
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#include "puzzles.h"
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void frontend_default_colour(frontend *fe, float *output) {}
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void get_random_seed(void **randseed, int *randseedsize)
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{ char *c = snewn(1, char); *c = 0; *randseed = c; *randseedsize = 1; }
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void deactivate_timer(frontend *fe) {}
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void activate_timer(frontend *fe) {}
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drawing *drawing_new(const drawing_api *api, midend *me, void *handle)
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{ return snew(drawing); }
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void drawing_free(drawing *dr) { sfree(dr); }
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void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
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int align, int colour, const char *text) {}
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void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}
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#ifndef STANDALONE_POLYGON
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void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) {}
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#endif
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void draw_thick_line(drawing *dr, float thickness,
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float x1, float y1, float x2, float y2, int colour) {}
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void draw_polygon(drawing *dr, const int *coords, int npoints,
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int fillcolour, int outlinecolour) {}
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void draw_circle(drawing *dr, int cx, int cy, int radius,
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int fillcolour, int outlinecolour) {}
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char *text_fallback(drawing *dr, const char *const *strings, int nstrings)
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{ return dupstr(strings[0]); }
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void clip(drawing *dr, int x, int y, int w, int h) {}
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void unclip(drawing *dr) {}
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void start_draw(drawing *dr) {}
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void draw_update(drawing *dr, int x, int y, int w, int h) {}
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void end_draw(drawing *dr) {}
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struct blitter { char dummy; };
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blitter *blitter_new(drawing *dr, int w, int h) { return snew(blitter); }
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void blitter_free(drawing *dr, blitter *bl) { sfree(bl); }
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void blitter_save(drawing *dr, blitter *bl, int x, int y) {}
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void blitter_load(drawing *dr, blitter *bl, int x, int y) {}
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int print_mono_colour(drawing *dr, int grey) { return 0; }
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int print_grey_colour(drawing *dr, float grey) { return 0; }
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int print_hatched_colour(drawing *dr, int hatch) { return 0; }
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int print_rgb_mono_colour(drawing *dr, float r, float g, float b, int grey)
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{ return 0; }
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int print_rgb_grey_colour(drawing *dr, float r, float g, float b, float grey)
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{ return 0; }
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int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch)
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{ return 0; }
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void print_line_width(drawing *dr, int width) {}
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void print_line_dotted(drawing *dr, bool dotted) {}
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void status_bar(drawing *dr, const char *text) {}
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void document_add_puzzle(document *doc, const game *game, game_params *par,
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game_ui *ui, game_state *st, game_state *st2) {}
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void fatal(const char *fmt, ...)
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{
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va_list ap;
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fprintf(stderr, "fatal error: ");
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(1);
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}
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#ifdef DEBUGGING
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void debug_printf(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stdout, fmt, ap);
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va_end(ap);
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}
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#endif
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