-#include "image.h"
+#define IMAGER_NO_CONTEXT
+#include "imager.h"
#include "draw.h"
#include "log.h"
-#include "imagei.h"
-
+#include "imageri.h"
+#include "imrender.h"
#include <limits.h>
+#define NDEBUG
+#include <assert.h>
+
+int
+i_ppix_norm(i_img *im, i_img_dim x, i_img_dim y, i_color const *col) {
+ i_color src;
+ i_color work;
+ int dest_alpha;
+ int remains;
+
+ if (!col->channel[3])
+ return 0;
+
+ switch (im->channels) {
+ case 1:
+ work = *col;
+ i_adapt_colors(2, 4, &work, 1);
+ i_gpix(im, x, y, &src);
+ remains = 255 - work.channel[1];
+ src.channel[0] = (src.channel[0] * remains
+ + work.channel[0] * work.channel[1]) / 255;
+ return i_ppix(im, x, y, &src);
+
+ case 2:
+ work = *col;
+ i_adapt_colors(2, 4, &work, 1);
+ i_gpix(im, x, y, &src);
+ remains = 255 - work.channel[1];
+ dest_alpha = work.channel[1] + remains * src.channel[1] / 255;
+ if (work.channel[1] == 255) {
+ return i_ppix(im, x, y, &work);
+ }
+ else {
+ src.channel[0] = (work.channel[1] * work.channel[0]
+ + remains * src.channel[0] * src.channel[1] / 255) / dest_alpha;
+ src.channel[1] = dest_alpha;
+ return i_ppix(im, x, y, &src);
+ }
+
+ case 3:
+ work = *col;
+ i_gpix(im, x, y, &src);
+ remains = 255 - work.channel[3];
+ src.channel[0] = (src.channel[0] * remains
+ + work.channel[0] * work.channel[3]) / 255;
+ src.channel[1] = (src.channel[1] * remains
+ + work.channel[1] * work.channel[3]) / 255;
+ src.channel[2] = (src.channel[2] * remains
+ + work.channel[2] * work.channel[3]) / 255;
+ return i_ppix(im, x, y, &src);
+
+ case 4:
+ work = *col;
+ i_gpix(im, x, y, &src);
+ remains = 255 - work.channel[3];
+ dest_alpha = work.channel[3] + remains * src.channel[3] / 255;
+ if (work.channel[3] == 255) {
+ return i_ppix(im, x, y, &work);
+ }
+ else {
+ src.channel[0] = (work.channel[3] * work.channel[0]
+ + remains * src.channel[0] * src.channel[3] / 255) / dest_alpha;
+ src.channel[1] = (work.channel[3] * work.channel[1]
+ + remains * src.channel[1] * src.channel[3] / 255) / dest_alpha;
+ src.channel[2] = (work.channel[3] * work.channel[2]
+ + remains * src.channel[2] * src.channel[3] / 255) / dest_alpha;
+ src.channel[3] = dest_alpha;
+ return i_ppix(im, x, y, &src);
+ }
+ }
+ return 0;
+}
+
+static void
+cfill_from_btm(i_img *im, i_fill_t *fill, struct i_bitmap *btm,
+ i_img_dim bxmin, i_img_dim bxmax, i_img_dim bymin, i_img_dim bymax);
void
-i_mmarray_cr(i_mmarray *ar,int l) {
- int i;
+i_mmarray_cr(i_mmarray *ar,i_img_dim l) {
+ i_img_dim i;
+ size_t alloc_size;
ar->lines=l;
- ar->data=mymalloc(sizeof(minmax)*l);
- for(i=0;i<l;i++) { ar->data[i].max=-1; ar->data[i].min=MAXINT; }
+ alloc_size = sizeof(minmax) * l;
+ /* check for overflow */
+ if (alloc_size / l != sizeof(minmax)) {
+ fprintf(stderr, "overflow calculating memory allocation");
+ exit(3);
+ }
+ ar->data=mymalloc(alloc_size); /* checked 5jul05 tonyc */
+ for(i=0;i<l;i++) {
+ ar->data[i].max = -1;
+ ar->data[i].min = i_img_dim_MAX;
+ }
}
void
}
void
-i_mmarray_add(i_mmarray *ar,int x,int y) {
+i_mmarray_add(i_mmarray *ar,i_img_dim x,i_img_dim y) {
if (y>-1 && y<ar->lines)
{
if (x<ar->data[y].min) ar->data[y].min=x;
}
}
-int
-i_mmarray_gmin(i_mmarray *ar,int y) {
+i_img_dim
+i_mmarray_gmin(i_mmarray *ar,i_img_dim y) {
if (y>-1 && y<ar->lines) return ar->data[y].min;
else return -1;
}
-int
-i_mmarray_getm(i_mmarray *ar,int y) {
- if (y>-1 && y<ar->lines) return ar->data[y].max;
- else return MAXINT;
+i_img_dim
+i_mmarray_getm(i_mmarray *ar,i_img_dim y) {
+ if (y>-1 && y<ar->lines)
+ return ar->data[y].max;
+ else
+ return i_img_dim_MAX;
}
+#if 0
+/* unused? */
void
i_mmarray_render(i_img *im,i_mmarray *ar,i_color *val) {
- int i,x;
+ i_img_dim i,x;
for(i=0;i<ar->lines;i++) if (ar->data[i].max!=-1) for(x=ar->data[i].min;x<ar->data[i].max;x++) i_ppix(im,x,i,val);
}
-
-void
-i_mmarray_render_fill(i_img *im,i_mmarray *ar,i_fill_t *fill) {
- int x, w, y;
- if (im->bits == i_8_bits && fill->fill_with_color) {
- i_color *line = mymalloc(sizeof(i_color) * im->xsize);
- i_color *work = NULL;
- if (fill->combine)
- work = mymalloc(sizeof(i_color) * im->xsize);
- for(y=0;y<ar->lines;y++) {
- if (ar->data[y].max!=-1) {
- x = ar->data[y].min;
- w = ar->data[y].max-ar->data[y].min;
-
- if (fill->combine) {
- i_glin(im, x, x+w, y, line);
- (fill->fill_with_color)(fill, x, y, w, im->channels, work);
- (fill->combine)(line, work, im->channels, w);
- }
- else {
- (fill->fill_with_color)(fill, x, y, w, im->channels, line);
- }
- i_plin(im, x, x+w, y, line);
- }
- }
-
- myfree(line);
- if (work)
- myfree(work);
- }
- else {
- i_fcolor *line = mymalloc(sizeof(i_fcolor) * im->xsize);
- i_fcolor *work = NULL;
- if (fill->combinef)
- work = mymalloc(sizeof(i_fcolor) * im->xsize);
- for(y=0;y<ar->lines;y++) {
- if (ar->data[y].max!=-1) {
- x = ar->data[y].min;
- w = ar->data[y].max-ar->data[y].min;
-
- if (fill->combinef) {
- i_glinf(im, x, x+w, y, line);
- (fill->fill_with_fcolor)(fill, x, y, w, im->channels, work);
- (fill->combinef)(line, work, im->channels, w);
- }
- else {
- (fill->fill_with_fcolor)(fill, x, y, w, im->channels, line);
- }
- i_plinf(im, x, x+w, y, line);
- }
- }
-
- myfree(line);
- if (work)
- myfree(work);
- }
-}
-
+#endif
static
void
-i_arcdraw(int x1, int y1, int x2, int y2, i_mmarray *ar) {
+i_arcdraw(i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, i_mmarray *ar) {
double alpha;
double dsec;
- int temp;
+ i_img_dim temp;
alpha=(double)(y2-y1)/(double)(x2-x1);
if (fabs(alpha) <= 1)
{
dsec=y1;
while(x1<=x2)
{
- i_mmarray_add(ar,x1,(int)(dsec+0.5));
+ i_mmarray_add(ar,x1,(i_img_dim)(dsec+0.5));
dsec+=alpha;
x1++;
}
dsec=x1;
while(y1<=y2)
{
- i_mmarray_add(ar,(int)(dsec+0.5),y1);
+ i_mmarray_add(ar,(i_img_dim)(dsec+0.5),y1);
dsec+=alpha;
y1++;
}
void
i_mmarray_info(i_mmarray *ar) {
- int i;
+ i_img_dim i;
for(i=0;i<ar->lines;i++)
- if (ar->data[i].max!=-1) printf("line %d: min=%d, max=%d.\n",i,ar->data[i].min,ar->data[i].max);
+ if (ar->data[i].max!=-1)
+ printf("line %"i_DF ": min=%" i_DF ", max=%" i_DF ".\n",
+ i_DFc(i), i_DFc(ar->data[i].min), i_DFc(ar->data[i].max));
}
static void
-i_arc_minmax(i_int_hlines *hlines,int x,int y,float rad,float d1,float d2) {
+i_arc_minmax(i_int_hlines *hlines,i_img_dim x,i_img_dim y, double rad,float d1,float d2) {
i_mmarray dot;
- float f,fx,fy;
- int x1,y1;
-
- /*mm_log((1,"i_arc(im* 0x%x,x %d,y %d,rad %.2f,d1 %.2f,d2 %.2f,val 0x%x)\n",im,x,y,rad,d1,d2,val));*/
+ double f;
+ i_img_dim x1,y1;
i_mmarray_cr(&dot, hlines->limit_y);
- x1=(int)(x+0.5+rad*cos(d1*PI/180.0));
- y1=(int)(y+0.5+rad*sin(d1*PI/180.0));
- fx=(float)x1; fy=(float)y1;
+ x1=(i_img_dim)(x+0.5+rad*cos(d1*PI/180.0));
+ y1=(i_img_dim)(y+0.5+rad*sin(d1*PI/180.0));
/* printf("x1: %d.\ny1: %d.\n",x1,y1); */
i_arcdraw(x, y, x1, y1, &dot);
- x1=(int)(x+0.5+rad*cos(d2*PI/180.0));
- y1=(int)(y+0.5+rad*sin(d2*PI/180.0));
+ x1=(i_img_dim)(x+0.5+rad*cos(d2*PI/180.0));
+ y1=(i_img_dim)(y+0.5+rad*sin(d2*PI/180.0));
- for(f=d1;f<=d2;f+=0.01) i_mmarray_add(&dot,(int)(x+0.5+rad*cos(f*PI/180.0)),(int)(y+0.5+rad*sin(f*PI/180.0)));
+ for(f=d1;f<=d2;f+=0.01)
+ i_mmarray_add(&dot,(i_img_dim)(x+0.5+rad*cos(f*PI/180.0)),(i_img_dim)(y+0.5+rad*sin(f*PI/180.0)));
/* printf("x1: %d.\ny1: %d.\n",x1,y1); */
i_arcdraw(x, y, x1, y1, &dot);
/* render the minmax values onto the hlines */
for (y = 0; y < dot.lines; y++) {
if (dot.data[y].max!=-1) {
- int minx, width;
+ i_img_dim minx, width;
minx = dot.data[y].min;
width = dot.data[y].max - dot.data[y].min + 1;
i_int_hlines_add(hlines, y, minx, width);
}
static void
-i_arc_hlines(i_int_hlines *hlines,int x,int y,float rad,float d1,float d2) {
+i_arc_hlines(i_int_hlines *hlines,i_img_dim x,i_img_dim y,double rad,float d1,float d2) {
if (d1 <= d2) {
i_arc_minmax(hlines, x, y, rad, d1, d2);
}
}
}
+/*
+=item i_arc(im, x, y, rad, d1, d2, color)
+
+=category Drawing
+=synopsis i_arc(im, 50, 50, 20, 45, 135, &color);
+
+Fills an arc centered at (x,y) with radius I<rad> covering the range
+of angles in degrees from d1 to d2, with the color.
+
+=cut
+*/
+
void
-i_arc(i_img *im,int x,int y,float rad,float d1,float d2,i_color *val) {
+i_arc(i_img *im, i_img_dim x, i_img_dim y,double rad,double d1,double d2,const i_color *val) {
i_int_hlines hlines;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc(im %p,(x,y)=(" i_DFp "), rad %f, d1 %f, d2 %f, col %p)",
+ im, i_DFcp(x, y), rad, d1, d2, val));
i_int_init_hlines_img(&hlines, im);
i_int_hlines_destroy(&hlines);
}
+/*
+=item i_arc_cfill(im, x, y, rad, d1, d2, fill)
+
+=category Drawing
+=synopsis i_arc_cfill(im, 50, 50, 35, 90, 135, fill);
+
+Fills an arc centered at (x,y) with radius I<rad> covering the range
+of angles in degrees from d1 to d2, with the fill object.
+
+=cut
+*/
+
#define MIN_CIRCLE_STEPS 8
#define MAX_CIRCLE_STEPS 360
void
-i_arc_cfill(i_img *im,int x,int y,float rad,float d1,float d2,i_fill_t *fill) {
+i_arc_cfill(i_img *im, i_img_dim x, i_img_dim y,double rad,double d1,double d2,i_fill_t *fill) {
i_int_hlines hlines;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc_cfill(im %p,(x,y)=(" i_DFp "), rad %f, d1 %f, d2 %f, fill %p)",
+ im, i_DFcp(x, y), rad, d1, d2, fill));
i_int_init_hlines_img(&hlines, im);
double x, double y, double rad, double d1, double d2) {
double d1_rad, d2_rad;
double circum;
- int steps, point_count;
+ i_img_dim steps, point_count;
double angle_inc;
/* normalize the angles */
angle_inc = 2 * PI / steps;
point_count = steps + 5; /* rough */
- *xvals = mymalloc(point_count * sizeof(double));
- *yvals = mymalloc(point_count * sizeof(double));
+ /* point_count is always relatively small, so allocation won't overflow */
+ *xvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
+ *yvals = mymalloc(point_count * sizeof(double)); /* checked 17feb2005 tonyc */
/* from centre to edge at d1 */
(*xvals)[0] = x;
++*count;
}
+/*
+=item i_arc_aa(im, x, y, rad, d1, d2, color)
+
+=category Drawing
+=synopsis i_arc_aa(im, 50, 50, 35, 90, 135, &color);
+
+Anti-alias fills an arc centered at (x,y) with radius I<rad> covering
+the range of angles in degrees from d1 to d2, with the color.
+
+=cut
+*/
+
void
i_arc_aa(i_img *im, double x, double y, double rad, double d1, double d2,
- i_color *val) {
+ const i_color *val) {
double *xvals, *yvals;
int count;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc_aa(im %p,(x,y)=(%f,%f), rad %f, d1 %f, d2 %f, col %p)",
+ im, x, y, rad, d1, d2, val));
arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
myfree(yvals);
}
+/*
+=item i_arc_aa_cfill(im, x, y, rad, d1, d2, fill)
+
+=category Drawing
+=synopsis i_arc_aa_cfill(im, 50, 50, 35, 90, 135, fill);
+
+Anti-alias fills an arc centered at (x,y) with radius I<rad> covering
+the range of angles in degrees from d1 to d2, with the fill object.
+
+=cut
+*/
+
void
i_arc_aa_cfill(i_img *im, double x, double y, double rad, double d1, double d2,
i_fill_t *fill) {
double *xvals, *yvals;
int count;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc_aa_cfill(im %p,(x,y)=(%f,%f), rad %f, d1 %f, d2 %f, fill %p)",
+ im, x, y, rad, d1, d2, fill));
arc_poly(&count, &xvals, &yvals, x, y, rad, d1, d2);
myfree(yvals);
}
-/* Temporary AA HACK */
+typedef i_img_dim frac;
+static frac float_to_frac(double x) { return (frac)(0.5+x*16.0); }
+typedef void
+(*flush_render_t)(i_img *im, i_img_dim l, i_img_dim r, i_img_dim y, const i_sample_t *cover, void *ctx);
-typedef int frac;
-static frac float_to_frac(float x) { return (frac)(0.5+x*16.0); }
-static int frac_sub (frac x) { return (x%16); }
-static int frac_int (frac x) { return (x/16); }
-static float frac_to_float(float x) { return (float)x/16.0; }
+static void
+i_circle_aa_low(i_img *im, double x, double y, double rad, flush_render_t r, void *ctx);
-static
-void
-polar_to_plane(float cx, float cy, float angle, float radius, frac *x, frac *y) {
- *x = float_to_frac(cx+radius*cos(angle));
- *y = float_to_frac(cy+radius*sin(angle));
-}
+static void
+scanline_flush_color(i_img *im, i_img_dim l, i_img_dim y, i_img_dim width, const i_sample_t *cover, void *ctx);
+
+static void
+scanline_flush_fill(i_img *im, i_img_dim l, i_img_dim y, i_img_dim width, const i_sample_t *cover, void *ctx);
+
+typedef struct {
+ i_render r;
+ i_color c;
+} flush_color_t;
+
+typedef struct {
+ i_render r;
+ i_fill_t *fill;
+} flush_fill_t;
+
+/*
+=item i_circle_aa(im, x, y, rad, color)
+
+=category Drawing
+=synopsis i_circle_aa(im, 50, 50, 45, &color);
+
+Anti-alias fills a circle centered at (x,y) for radius I<rad> with
+color.
+
+=cut
+*/
-static
void
-order_pair(frac *x, frac *y) {
- frac t = *x;
- if (t>*y) {
- *x = *y;
- *y = t;
- }
+i_circle_aa(i_img *im, double x, double y, double rad, const i_color *val) {
+ flush_color_t fc;
+
+ fc.c = *val;
+ i_render_init(&fc.r, im, rad * 2 + 1);
+
+ i_circle_aa_low(im, x, y, rad, scanline_flush_color, &fc);
+
+ i_render_done(&fc.r);
}
+/*
+=item i_circle_aa_fill(im, x, y, rad, fill)
+=category Drawing
+=synopsis i_circle_aa_fill(im, 50, 50, 45, fill);
+Anti-alias fills a circle centered at (x,y) for radius I<rad> with
+fill.
+
+=cut
+*/
-static
void
-make_minmax_list(i_mmarray *dot, float x, float y, float radius) {
- float angle = 0.0;
- float astep = radius>0.1 ? .5/radius : 10;
- frac cx, cy, lx, ly, sx, sy;
+i_circle_aa_fill(i_img *im, double x, double y, double rad, i_fill_t *fill) {
+ flush_fill_t ff;
- mm_log((1, "make_minmax_list(dot %p, x %.2f, y %.2f, radius %.2f)\n", dot, x, y, radius));
+ ff.fill = fill;
+ i_render_init(&ff.r, im, rad * 2 + 1);
- polar_to_plane(x, y, angle, radius, &sx, &sy);
-
- for(angle = 0.0; angle<361; angle +=astep) {
- lx = sx; ly = sy;
- polar_to_plane(x, y, angle, radius, &cx, &cy);
- sx = cx; sy = cy;
-
- if (fabs(cx-lx) > fabs(cy-ly)) {
- int ccx, ccy;
- if (lx>cx) {
- ccx = lx; lx = cx; cx = ccx;
- ccy = ly; ly = cy; cy = ccy;
- }
+ i_circle_aa_low(im, x, y, rad, scanline_flush_fill, &ff);
- for(ccx=lx; ccx<=cx; ccx++) {
- ccy = ly + ((cy-ly)*(ccx-lx))/(cx-lx);
- i_mmarray_add(dot, ccx, ccy);
- }
- } else {
- int ccx, ccy;
+ i_render_done(&ff.r);
+}
- if (ly>cy) {
- ccy = ly; ly = cy; cy = ccy;
- ccx = lx; lx = cx; cx = ccx;
- }
+static void
+i_circle_aa_low(i_img *im, double x, double y, double rad, flush_render_t r,
+ void *ctx) {
+ i_color temp;
+ i_img_dim ly;
+ dIMCTXim(im);
+ double ceil_rad = ceil(rad);
+ i_img_dim first_row = floor(y) - ceil_rad;
+ i_img_dim last_row = ceil(y) + ceil_rad;
+ i_img_dim first_col = floor(x) - ceil_rad;
+ i_img_dim last_col = ceil(x) + ceil_rad;
+ double r_sqr = rad * rad;
+ i_img_dim max_width = 2 * ceil(rad) + 1;
+ unsigned char *coverage = NULL;
+ size_t coverage_size;
+ int sub;
+
+ im_log((aIMCTX, 1, "i_circle_aa_low(im %p, centre(" i_DFp "), rad %.2f, r %p, ctx %p)\n",
+ im, i_DFcp(x, y), rad, r, ctx));
+
+ if (first_row < 0)
+ first_row = 0;
+ if (last_row > im->ysize-1)
+ last_row = im->ysize - 1;
+ if (first_col < 0)
+ first_col = 0;
+ if (last_col > im->xsize-1)
+ last_col = im->xsize - 1;
+
+ if (rad <= 0 || last_row < first_row || last_col < first_col) {
+ /* outside the image */
+ return;
+ }
+
+ coverage_size = max_width;
+ coverage = mymalloc(coverage_size);
+
+ for(ly = first_row; ly < last_row; ly++) {
+ frac min_frac_x[16];
+ frac max_frac_x[16];
+ i_img_dim min_frac_left_x = 16 *(ceil(x) + ceil(rad));
+ i_img_dim max_frac_left_x = -1;
+ i_img_dim min_frac_right_x = 16 * (floor(x) - ceil(rad));
+ i_img_dim max_frac_right_x = -1;
+ /* reset work_y each row so the error doesn't build up */
+ double work_y = ly;
+ double dy, dy_sqr;
- for(ccy=ly; ccy<=cy; ccy++) {
- if (cy-ly) ccx = lx + ((cx-lx)*(ccy-ly))/(cy-ly); else ccx = lx;
- i_mmarray_add(dot, ccx, ccy);
+ for (sub = 0; sub < 16; ++sub) {
+ work_y += 1.0 / 16.0;
+ dy = work_y - y;
+ dy_sqr = dy * dy;
+
+ if (dy_sqr < r_sqr) {
+ double dx = sqrt(r_sqr - dy_sqr);
+ double left_x = x - dx;
+ double right_x = x + dx;
+ frac frac_left_x = float_to_frac(left_x);
+ frac frac_right_x = float_to_frac(right_x);
+
+ if (frac_left_x < min_frac_left_x)
+ min_frac_left_x = frac_left_x;
+ if (frac_left_x > max_frac_left_x)
+ max_frac_left_x = frac_left_x;
+ if (frac_right_x < min_frac_right_x)
+ min_frac_right_x = frac_right_x;
+ if (frac_right_x > max_frac_right_x)
+ max_frac_right_x = frac_right_x;
+ min_frac_x[sub] = frac_left_x;
+ max_frac_x[sub] = frac_right_x;
+ }
+ else {
+ min_frac_x[sub] = max_frac_x[sub] = 0;
+ max_frac_left_x = im->xsize * 16;
+ min_frac_right_x = -1;
}
}
+
+ if (min_frac_left_x != -1) {
+ /* something to draw on this line */
+ i_img_dim min_x = (min_frac_left_x / 16);
+ i_img_dim max_x = (max_frac_right_x + 15) / 16;
+ i_img_dim left_solid = (max_frac_left_x + 15) / 16;
+ i_img_dim right_solid = min_frac_right_x / 16;
+ i_img_dim work_x;
+ i_img_dim frac_work_x;
+ i_sample_t *cout = coverage;
+
+ for (work_x = min_x, frac_work_x = min_x * 16;
+ work_x <= max_x;
+ ++work_x, frac_work_x += 16) {
+ if (work_x <= left_solid || work_x >= right_solid) {
+ int pix_coverage = 0;
+ int ch;
+ double ratio;
+ i_img_dim frac_work_right = frac_work_x + 16;
+ for (sub = 0; sub < 16; ++sub) {
+ frac pix_left = min_frac_x[sub];
+ frac pix_right = max_frac_x[sub];
+ if (pix_left < pix_right
+ && pix_left < frac_work_right
+ && pix_right >= frac_work_x) {
+ if (pix_left < frac_work_x)
+ pix_left = frac_work_x;
+ if (pix_right > frac_work_right)
+ pix_right = frac_work_right;
+ pix_coverage += pix_right - pix_left;
+ }
+ }
+
+ assert(pix_coverage <= 256);
+ *cout++ = pix_coverage * 255 / 256;
+ }
+ else {
+ /* full coverage */
+ *cout++ = 255;
+ }
+ }
+ r(im, min_x, ly, max_x - min_x + 1, coverage, ctx);
+ }
}
+
+ myfree(coverage);
}
-/* Get the number of subpixels covered */
+static void
+scanline_flush_color(i_img *im, i_img_dim x, i_img_dim y, i_img_dim width, const unsigned char *cover, void *ctx) {
+ flush_color_t *fc = ctx;
+
+ i_render_color(&fc->r, x, y, width, cover, &fc->c);
+}
+
+static void
+scanline_flush_fill(i_img *im, i_img_dim x, i_img_dim y, i_img_dim width, const unsigned char *cover, void *ctx) {
+ flush_fill_t *ff = ctx;
+
+ i_render_fill(&ff->r, x, y, width, cover, ff->fill);
+}
+
+
+/*
+=item i_circle_out(im, x, y, r, col)
+
+=category Drawing
+=synopsis i_circle_out(im, 50, 50, 45, &color);
+
+Draw a circle outline centered at (x,y) with radius r,
+non-anti-aliased.
+
+Parameters:
+
+=over
+
+=item *
+
+(x, y) - the center of the circle
+
+=item *
+
+r - the radius of the circle in pixels, must be non-negative
+
+=back
+
+Returns non-zero on success.
+
+Implementation:
+
+=cut
+*/
-static
int
-i_pixel_coverage(i_mmarray *dot, int x, int y) {
- frac minx = x*16;
- frac maxx = minx+15;
- frac cy;
- int cnt = 0;
-
- for(cy=y*16; cy<(y+1)*16; cy++) {
- frac tmin = dot->data[cy].min;
- frac tmax = dot->data[cy].max;
+i_circle_out(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r,
+ const i_color *col) {
+ i_img_dim x, y;
+ i_img_dim dx, dy;
+ int error;
+ dIMCTXim(im);
- if (tmax == -1 || tmin > maxx || tmax < minx) continue;
-
- if (tmin < minx) tmin = minx;
- if (tmax > maxx) tmax = maxx;
-
- cnt+=1+tmax-tmin;
+ im_log((aIMCTX, 1, "i_circle_out(im %p, centre(" i_DFp "), rad %" i_DF ", col %p)\n",
+ im, i_DFcp(xc, yc), i_DFc(r), col));
+
+ im_clear_error(aIMCTX);
+
+ if (r < 0) {
+ im_push_error(aIMCTX, 0, "circle: radius must be non-negative");
+ return 0;
+ }
+
+ i_ppix(im, xc+r, yc, col);
+ i_ppix(im, xc-r, yc, col);
+ i_ppix(im, xc, yc+r, col);
+ i_ppix(im, xc, yc-r, col);
+
+ x = 0;
+ y = r;
+ dx = 1;
+ dy = -2 * r;
+ error = 1 - r;
+ while (x < y) {
+ if (error >= 0) {
+ --y;
+ dy += 2;
+ error += dy;
+ }
+ ++x;
+ dx += 2;
+ error += dx;
+
+ i_ppix(im, xc + x, yc + y, col);
+ i_ppix(im, xc + x, yc - y, col);
+ i_ppix(im, xc - x, yc + y, col);
+ i_ppix(im, xc - x, yc - y, col);
+ if (x != y) {
+ i_ppix(im, xc + y, yc + x, col);
+ i_ppix(im, xc + y, yc - x, col);
+ i_ppix(im, xc - y, yc + x, col);
+ i_ppix(im, xc - y, yc - x, col);
+ }
}
- return cnt;
+
+ return 1;
}
-void
-i_circle_aa(i_img *im, float x, float y, float rad, i_color *val) {
- i_mmarray dot;
- i_color temp;
- int ly;
+/*
+=item arc_seg(angle)
- mm_log((1, "i_circle_aa(im %p, x %d, y %d, rad %.2f, val %p)\n", im, x, y, rad, val));
+Convert an angle in degrees into an angle measure we can generate
+simply from the numbers we have when drawing the circle.
- i_mmarray_cr(&dot,16*im->ysize);
- make_minmax_list(&dot, x, y, rad);
+=cut
+*/
+
+static i_img_dim
+arc_seg(double angle, int scale) {
+ i_img_dim seg = (angle + 45) / 90;
+ double remains = angle - seg * 90; /* should be in the range [-45,45] */
+
+ while (seg > 4)
+ seg -= 4;
+ if (seg == 4 && remains > 0)
+ seg = 0;
+
+ return scale * (seg * 2 + sin(remains * PI/180));
+}
+
+/*
+=item i_arc_out(im, x, y, r, d1, d2, col)
+
+=category Drawing
+=synopsis i_arc_out(im, 50, 50, 45, 45, 135, &color);
+
+Draw an arc outline centered at (x,y) with radius r, non-anti-aliased
+over the angle range d1 through d2 degrees.
+
+Parameters:
+
+=over
+
+=item *
+
+(x, y) - the center of the circle
+
+=item *
+
+r - the radius of the circle in pixels, must be non-negative
+
+=item *
- for(ly = 0; ly<im->ysize; ly++) {
- int ix, cy, minx = INT_MAX, maxx = INT_MIN;
+d1, d2 - the range of angles to draw the arc over, in degrees.
- /* Find the left/rightmost set subpixels */
- for(cy = 0; cy<16; cy++) {
- frac tmin = dot.data[ly*16+cy].min;
- frac tmax = dot.data[ly*16+cy].max;
- if (tmax == -1) continue;
+=back
- if (minx > tmin) minx = tmin;
- if (maxx < tmax) maxx = tmax;
+Returns non-zero on success.
+
+Implementation:
+
+=cut
+*/
+
+int
+i_arc_out(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r,
+ double d1, double d2, const i_color *col) {
+ i_img_dim x, y;
+ i_img_dim dx, dy;
+ int error;
+ i_img_dim segs[2][2];
+ int seg_count;
+ i_img_dim sin_th;
+ i_img_dim seg_d1, seg_d2;
+ int seg_num;
+ i_img_dim scale = r + 1;
+ i_img_dim seg1 = scale * 2;
+ i_img_dim seg2 = scale * 4;
+ i_img_dim seg3 = scale * 6;
+ i_img_dim seg4 = scale * 8;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc_out(im %p,centre(" i_DFp "), rad %" i_DF ", d1 %f, d2 %f, col %p)",
+ im, i_DFcp(xc, yc), i_DFc(r), d1, d2, col));
+
+ im_clear_error(aIMCTX);
+
+ if (r <= 0) {
+ im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
+ return 0;
+ }
+ if (d1 + 360 <= d2)
+ return i_circle_out(im, xc, yc, r, col);
+
+ if (d1 < 0)
+ d1 += 360 * floor((-d1 + 359) / 360);
+ if (d2 < 0)
+ d2 += 360 * floor((-d2 + 359) / 360);
+ d1 = fmod(d1, 360);
+ d2 = fmod(d2, 360);
+ seg_d1 = arc_seg(d1, scale);
+ seg_d2 = arc_seg(d2, scale);
+ if (seg_d2 < seg_d1) {
+ /* split into two segments */
+ segs[0][0] = 0;
+ segs[0][1] = seg_d2;
+ segs[1][0] = seg_d1;
+ segs[1][1] = seg4;
+ seg_count = 2;
+ }
+ else {
+ segs[0][0] = seg_d1;
+ segs[0][1] = seg_d2;
+ seg_count = 1;
+ }
+
+ for (seg_num = 0; seg_num < seg_count; ++seg_num) {
+ i_img_dim seg_start = segs[seg_num][0];
+ i_img_dim seg_end = segs[seg_num][1];
+ if (seg_start == 0)
+ i_ppix(im, xc+r, yc, col);
+ if (seg_start <= seg1 && seg_end >= seg1)
+ i_ppix(im, xc, yc+r, col);
+ if (seg_start <= seg2 && seg_end >= seg2)
+ i_ppix(im, xc-r, yc, col);
+ if (seg_start <= seg3 && seg_end >= seg3)
+ i_ppix(im, xc, yc-r, col);
+
+ y = 0;
+ x = r;
+ dy = 1;
+ dx = -2 * r;
+ error = 1 - r;
+ while (y < x) {
+ if (error >= 0) {
+ --x;
+ dx += 2;
+ error += dx;
+ }
+ ++y;
+ dy += 2;
+ error += dy;
+
+ sin_th = y;
+ if (seg_start <= sin_th && seg_end >= sin_th)
+ i_ppix(im, xc + x, yc + y, col);
+ if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
+ i_ppix(im, xc + y, yc + x, col);
+
+ if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
+ i_ppix(im, xc - y, yc + x, col);
+ if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
+ i_ppix(im, xc - x, yc + y, col);
+
+ if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
+ i_ppix(im, xc - x, yc - y, col);
+ if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
+ i_ppix(im, xc - y, yc - x, col);
+
+ if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
+ i_ppix(im, xc + y, yc - x, col);
+ if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
+ i_ppix(im, xc + x, yc - y, col);
}
+ }
+
+ return 1;
+}
+
+static double
+cover(i_img_dim r, i_img_dim j) {
+ double rjsqrt = sqrt(r*r - j*j);
+
+ return ceil(rjsqrt) - rjsqrt;
+}
+
+/*
+=item i_circle_out_aa(im, xc, yc, r, col)
+
+=synopsis i_circle_out_aa(im, 50, 50, 45, &color);
+
+Draw a circle outline centered at (x,y) with radius r, anti-aliased.
+
+Parameters:
+
+=over
- if (maxx == INT_MIN) continue; /* no work to be done for this row of pixels */
-
- minx /= 16;
- maxx /= 16;
- for(ix=minx; ix<=maxx; ix++) {
- int cnt = i_pixel_coverage(&dot, ix, ly);
- if (cnt>255) cnt = 255;
- if (cnt) { /* should never be true */
- int ch;
- float ratio = (float)cnt/255.0;
- i_gpix(im, ix, ly, &temp);
- for(ch=0;ch<im->channels; ch++) temp.channel[ch] = (unsigned char)((float)val->channel[ch]*ratio + (float)temp.channel[ch]*(1.0-ratio));
- i_ppix(im, ix, ly, &temp);
+=item *
+
+(xc, yc) - the center of the circle
+
+=item *
+
+r - the radius of the circle in pixels, must be non-negative
+
+=item *
+
+col - an i_color for the color to draw in.
+
+=back
+
+Returns non-zero on success.
+
+=cut
+
+Based on "Fast Anti-Aliased Circle Generation", Xiaolin Wu, Graphics
+Gems.
+
+I use floating point for I<D> since for large circles the precision of
+a [0,255] value isn't sufficient when approaching the end of the
+octant.
+
+*/
+
+int
+i_circle_out_aa(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r, const i_color *col) {
+ i_img_dim i, j;
+ double t;
+ i_color workc = *col;
+ int orig_alpha = col->channel[3];
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_circle_out_aa(im %p,centre(" i_DFp "), rad %" i_DF ", col %p)",
+ im, i_DFcp(xc, yc), i_DFc(r), col));
+
+ im_clear_error(aIMCTX);
+ if (r <= 0) {
+ im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
+ return 0;
+ }
+ i = r;
+ j = 0;
+ t = 0;
+ i_ppix_norm(im, xc+i, yc+j, col);
+ i_ppix_norm(im, xc-i, yc+j, col);
+ i_ppix_norm(im, xc+j, yc+i, col);
+ i_ppix_norm(im, xc+j, yc-i, col);
+
+ while (i > j+1) {
+ double d;
+ int cv, inv_cv;
+ j++;
+ d = cover(r, j);
+ cv = (int)(d * 255 + 0.5);
+ inv_cv = 255-cv;
+ if (d < t) {
+ --i;
+ }
+ if (inv_cv) {
+ workc.channel[3] = orig_alpha * inv_cv / 255;
+ i_ppix_norm(im, xc+i, yc+j, &workc);
+ i_ppix_norm(im, xc-i, yc+j, &workc);
+ i_ppix_norm(im, xc+i, yc-j, &workc);
+ i_ppix_norm(im, xc-i, yc-j, &workc);
+
+ if (i != j) {
+ i_ppix_norm(im, xc+j, yc+i, &workc);
+ i_ppix_norm(im, xc-j, yc+i, &workc);
+ i_ppix_norm(im, xc+j, yc-i, &workc);
+ i_ppix_norm(im, xc-j, yc-i, &workc);
+ }
+ }
+ if (cv && i > j) {
+ workc.channel[3] = orig_alpha * cv / 255;
+ i_ppix_norm(im, xc+i-1, yc+j, &workc);
+ i_ppix_norm(im, xc-i+1, yc+j, &workc);
+ i_ppix_norm(im, xc+i-1, yc-j, &workc);
+ i_ppix_norm(im, xc-i+1, yc-j, &workc);
+
+ if (j != i-1) {
+ i_ppix_norm(im, xc+j, yc+i-1, &workc);
+ i_ppix_norm(im, xc-j, yc+i-1, &workc);
+ i_ppix_norm(im, xc+j, yc-i+1, &workc);
+ i_ppix_norm(im, xc-j, yc-i+1, &workc);
}
}
+ t = d;
}
- i_mmarray_dst(&dot);
+
+ return 1;
}
+/*
+=item i_arc_out_aa(im, xc, yc, r, d1, d2, col)
+
+=synopsis i_arc_out_aa(im, 50, 50, 45, 45, 125, &color);
+
+Draw a circle arc outline centered at (x,y) with radius r, from angle
+d1 degrees through angle d2 degrees, anti-aliased.
+
+Parameters:
+
+=over
+
+=item *
+
+(xc, yc) - the center of the circle
+
+=item *
+
+r - the radius of the circle in pixels, must be non-negative
+=item *
+d1, d2 - the range of angle in degrees to draw the arc through. If
+d2-d1 >= 360 a full circle is drawn.
+=back
+Returns non-zero on success.
+
+=cut
+
+Based on "Fast Anti-Aliased Circle Generation", Xiaolin Wu, Graphics
+Gems.
+
+*/
+
+int
+i_arc_out_aa(i_img *im, i_img_dim xc, i_img_dim yc, i_img_dim r, double d1, double d2, const i_color *col) {
+ i_img_dim i, j;
+ double t;
+ i_color workc = *col;
+ i_img_dim segs[2][2];
+ int seg_count;
+ i_img_dim sin_th;
+ i_img_dim seg_d1, seg_d2;
+ int seg_num;
+ int orig_alpha = col->channel[3];
+ i_img_dim scale = r + 1;
+ i_img_dim seg1 = scale * 2;
+ i_img_dim seg2 = scale * 4;
+ i_img_dim seg3 = scale * 6;
+ i_img_dim seg4 = scale * 8;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_arc_out_aa(im %p,centre(" i_DFp "), rad %" i_DF ", d1 %f, d2 %f, col %p)",
+ im, i_DFcp(xc, yc), i_DFc(r), d1, d2, col));
+
+ im_clear_error(aIMCTX);
+ if (r <= 0) {
+ im_push_error(aIMCTX, 0, "arc: radius must be non-negative");
+ return 0;
+ }
+ if (d1 + 360 <= d2)
+ return i_circle_out_aa(im, xc, yc, r, col);
+
+ if (d1 < 0)
+ d1 += 360 * floor((-d1 + 359) / 360);
+ if (d2 < 0)
+ d2 += 360 * floor((-d2 + 359) / 360);
+ d1 = fmod(d1, 360);
+ d2 = fmod(d2, 360);
+ seg_d1 = arc_seg(d1, scale);
+ seg_d2 = arc_seg(d2, scale);
+ if (seg_d2 < seg_d1) {
+ /* split into two segments */
+ segs[0][0] = 0;
+ segs[0][1] = seg_d2;
+ segs[1][0] = seg_d1;
+ segs[1][1] = seg4;
+ seg_count = 2;
+ }
+ else {
+ segs[0][0] = seg_d1;
+ segs[0][1] = seg_d2;
+ seg_count = 1;
+ }
+
+ for (seg_num = 0; seg_num < seg_count; ++seg_num) {
+ i_img_dim seg_start = segs[seg_num][0];
+ i_img_dim seg_end = segs[seg_num][1];
+
+ i = r;
+ j = 0;
+ t = 0;
+
+ if (seg_start == 0)
+ i_ppix_norm(im, xc+i, yc+j, col);
+ if (seg_start <= seg1 && seg_end >= seg1)
+ i_ppix_norm(im, xc+j, yc+i, col);
+ if (seg_start <= seg2 && seg_end >= seg2)
+ i_ppix_norm(im, xc-i, yc+j, col);
+ if (seg_start <= seg3 && seg_end >= seg3)
+ i_ppix_norm(im, xc+j, yc-i, col);
+
+ while (i > j+1) {
+ int cv, inv_cv;
+ double d;
+ j++;
+ d = cover(r, j);
+ cv = (int)(d * 255 + 0.5);
+ inv_cv = 255-cv;
+ if (d < t) {
+ --i;
+ }
+ sin_th = j;
+ if (inv_cv) {
+ workc.channel[3] = orig_alpha * inv_cv / 255;
+
+ if (seg_start <= sin_th && seg_end >= sin_th)
+ i_ppix_norm(im, xc+i, yc+j, &workc);
+ if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
+ i_ppix_norm(im, xc-i, yc+j, &workc);
+ if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
+ i_ppix_norm(im, xc+i, yc-j, &workc);
+ if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
+ i_ppix_norm(im, xc-i, yc-j, &workc);
+
+ if (i != j) {
+ if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
+ i_ppix_norm(im, xc+j, yc+i, &workc);
+ if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
+ i_ppix_norm(im, xc-j, yc+i, &workc);
+ if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
+ i_ppix_norm(im, xc+j, yc-i, &workc);
+ if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
+ i_ppix_norm(im, xc-j, yc-i, &workc);
+ }
+ }
+ if (cv && i > j) {
+ workc.channel[3] = orig_alpha * cv / 255;
+ if (seg_start <= sin_th && seg_end >= sin_th)
+ i_ppix_norm(im, xc+i-1, yc+j, &workc);
+ if (seg_start <= seg2 - sin_th && seg_end >= seg2 - sin_th)
+ i_ppix_norm(im, xc-i+1, yc+j, &workc);
+ if (seg_start <= seg4 - sin_th && seg_end >= seg4 - sin_th)
+ i_ppix_norm(im, xc+i-1, yc-j, &workc);
+ if (seg_start <= seg2 + sin_th && seg_end >= seg2 + sin_th)
+ i_ppix_norm(im, xc-i+1, yc-j, &workc);
+
+ if (seg_start <= seg1 - sin_th && seg_end >= seg1 - sin_th)
+ i_ppix_norm(im, xc+j, yc+i-1, &workc);
+ if (seg_start <= seg1 + sin_th && seg_end >= seg1 + sin_th)
+ i_ppix_norm(im, xc-j, yc+i-1, &workc);
+ if (seg_start <= seg3 + sin_th && seg_end >= seg3 + sin_th)
+ i_ppix_norm(im, xc+j, yc-i+1, &workc);
+ if (seg_start <= seg3 - sin_th && seg_end >= seg3 - sin_th)
+ i_ppix_norm(im, xc-j, yc-i+1, &workc);
+ }
+ t = d;
+ }
+ }
+
+ return 1;
+}
+
+/*
+=item i_box(im, x1, y1, x2, y2, color)
+
+=category Drawing
+=synopsis i_box(im, 0, 0, im->xsize-1, im->ysize-1, &color).
+
+Outlines the box from (x1,y1) to (x2,y2) inclusive with I<color>.
+
+=cut
+*/
void
-i_box(i_img *im,int x1,int y1,int x2,int y2,i_color *val) {
- int x,y;
- mm_log((1,"i_box(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
+i_box(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2,const i_color *val) {
+ i_img_dim x,y;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1,"i_box(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
+ im, i_DFcp(x1,y1), i_DFcp(x2,y2), val));
for(x=x1;x<x2+1;x++) {
i_ppix(im,x,y1,val);
i_ppix(im,x,y2,val);
}
}
-void
-i_box_filled(i_img *im,int x1,int y1,int x2,int y2,i_color *val) {
- int x,y;
- mm_log((1,"i_box_filled(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
- for(x=x1;x<x2+1;x++) for (y=y1;y<y2+1;y++) i_ppix(im,x,y,val);
-}
+/*
+=item i_box_filled(im, x1, y1, x2, y2, color)
+
+=category Drawing
+=synopsis i_box_filled(im, 0, 0, im->xsize-1, im->ysize-1, &color);
+
+Fills the box from (x1,y1) to (x2,y2) inclusive with color.
+
+=cut
+*/
void
-i_box_cfill(i_img *im,int x1,int y1,int x2,int y2,i_fill_t *fill) {
- mm_log((1,"i_box_cfill(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,fill 0x%x)\n",im,x1,y1,x2,y2,fill));
+i_box_filled(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2, const i_color *val) {
+ i_img_dim x, y, width;
+ i_palidx index;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_box_filled(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
+ im, i_DFcp(x1, y1), i_DFcp(x2,y2) ,val));
+
+ if (x1 > x2 || y1 > y2
+ || x2 < 0 || y2 < 0
+ || x1 >= im->xsize || y1 > im->ysize)
+ return;
+
+ if (x1 < 0)
+ x1 = 0;
+ if (x2 >= im->xsize)
+ x2 = im->xsize - 1;
+ if (y1 < 0)
+ y1 = 0;
+ if (y2 >= im->ysize)
+ y2 = im->ysize - 1;
+
+ width = x2 - x1 + 1;
+
+ if (im->type == i_palette_type
+ && i_findcolor(im, val, &index)) {
+ i_palidx *line = mymalloc(sizeof(i_palidx) * width);
+
+ for (x = 0; x < width; ++x)
+ line[x] = index;
+
+ for (y = y1; y <= y2; ++y)
+ i_ppal(im, x1, x2+1, y, line);
- ++x2;
- if (im->bits == i_8_bits && fill->fill_with_color) {
- i_color *line = mymalloc(sizeof(i_color) * (x2 - x1));
- i_color *work = NULL;
- if (fill->combine)
- work = mymalloc(sizeof(i_color) * (x2-x1));
- while (y1 <= y2) {
- if (fill->combine) {
- i_glin(im, x1, x2, y1, line);
- (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, work);
- (fill->combine)(line, work, im->channels, x2-x1);
- }
- else {
- (fill->fill_with_color)(fill, x1, y1, x2-x1, im->channels, line);
- }
- i_plin(im, x1, x2, y1, line);
- ++y1;
- }
myfree(line);
- if (work)
- myfree(work);
}
else {
- i_fcolor *line = mymalloc(sizeof(i_fcolor) * (x2 - x1));
- i_fcolor *work;
- work = mymalloc(sizeof(i_fcolor) * (x2 - x1));
-
- while (y1 <= y2) {
- if (fill->combine) {
- i_glinf(im, x1, x2, y1, line);
- (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, work);
- (fill->combinef)(line, work, im->channels, x2-x1);
- }
- else {
- (fill->fill_with_fcolor)(fill, x1, y1, x2-x1, im->channels, line);
- }
- i_plinf(im, x1, x2, y1, line);
- ++y1;
- }
+ i_color *line = mymalloc(sizeof(i_color) * width);
+
+ for (x = 0; x < width; ++x)
+ line[x] = *val;
+
+ for (y = y1; y <= y2; ++y)
+ i_plin(im, x1, x2+1, y, line);
+
+ myfree(line);
+ }
+}
+
+/*
+=item i_box_filledf(im, x1, y1, x2, y2, color)
+
+=category Drawing
+=synopsis i_box_filledf(im, 0, 0, im->xsize-1, im->ysize-1, &fcolor);
+
+Fills the box from (x1,y1) to (x2,y2) inclusive with a floating point
+color.
+
+=cut
+*/
+
+int
+i_box_filledf(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2, const i_fcolor *val) {
+ i_img_dim x, y, width;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1,"i_box_filledf(im* %p, p1(" i_DFp "), p2(" i_DFp "),val %p)\n",
+ im, i_DFcp(x1, y1), i_DFcp(x2, y2), val));
+
+ if (x1 > x2 || y1 > y2
+ || x2 < 0 || y2 < 0
+ || x1 >= im->xsize || y1 > im->ysize)
+ return 0;
+
+ if (x1 < 0)
+ x1 = 0;
+ if (x2 >= im->xsize)
+ x2 = im->xsize - 1;
+ if (y1 < 0)
+ y1 = 0;
+ if (y2 >= im->ysize)
+ y2 = im->ysize - 1;
+
+ width = x2 - x1 + 1;
+
+ if (im->bits <= 8) {
+ i_color c;
+ c.rgba.r = SampleFTo8(val->rgba.r);
+ c.rgba.g = SampleFTo8(val->rgba.g);
+ c.rgba.b = SampleFTo8(val->rgba.b);
+ c.rgba.a = SampleFTo8(val->rgba.a);
+
+ i_box_filled(im, x1, y1, x2, y2, &c);
+ }
+ else {
+ i_fcolor *line = mymalloc(sizeof(i_fcolor) * width);
+
+ for (x = 0; x < width; ++x)
+ line[x] = *val;
+
+ for (y = y1; y <= y2; ++y)
+ i_plinf(im, x1, x2+1, y, line);
+
myfree(line);
- if (work)
- myfree(work);
}
+
+ return 1;
}
+/*
+=item i_box_cfill(im, x1, y1, x2, y2, fill)
+
+=category Drawing
+=synopsis i_box_cfill(im, 0, 0, im->xsize-1, im->ysize-1, fill);
+
+Fills the box from (x1,y1) to (x2,y2) inclusive with fill.
+
+=cut
+*/
+
+void
+i_box_cfill(i_img *im,i_img_dim x1,i_img_dim y1,i_img_dim x2,i_img_dim y2,i_fill_t *fill) {
+ i_render r;
+ dIMCTXim(im);
+
+ im_log((aIMCTX,1,"i_box_cfill(im* %p, p1(" i_DFp "), p2(" i_DFp "), fill %p)\n",
+ im, i_DFcp(x1, y1), i_DFcp(x2,y2), fill));
+
+ ++x2;
+ if (x1 < 0)
+ x1 = 0;
+ if (y1 < 0)
+ y1 = 0;
+ if (x2 > im->xsize)
+ x2 = im->xsize;
+ if (y2 >= im->ysize)
+ y2 = im->ysize-1;
+ if (x1 >= x2 || y1 > y2)
+ return;
+
+ i_render_init(&r, im, x2-x1);
+ while (y1 <= y2) {
+ i_render_fill(&r, x1, y1, x2-x1, NULL, fill);
+ ++y1;
+ }
+ i_render_done(&r);
+}
/*
-=item i_line(im, x1, y1, x2, y2, val, endp)
+=item i_line(C<im>, C<x1>, C<y1>, C<x2>, C<y2>, C<color>, C<endp>)
-Draw a line to image using bresenhams linedrawing algorithm
+=category Drawing
- im - image to draw to
- x1 - starting x coordinate
- y1 - starting x coordinate
- x2 - starting x coordinate
- y2 - starting x coordinate
- val - color to write to image
- endp - endpoint flag (boolean)
+=for stopwords Bresenham's
+
+Draw a line to image using Bresenham's line drawing algorithm
+
+ im - image to draw to
+ x1 - starting x coordinate
+ y1 - starting x coordinate
+ x2 - starting x coordinate
+ y2 - starting x coordinate
+ color - color to write to image
+ endp - endpoint flag (boolean)
=cut
*/
void
-i_line(i_img *im, int x1, int y1, int x2, int y2, i_color *val, int endp) {
- int x, y;
- int dx, dy;
- int p;
+i_line(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, const i_color *val, int endp) {
+ i_img_dim x, y;
+ i_img_dim dx, dy;
+ i_img_dim p;
dx = x2 - x1;
dy = y2 - y1;
/* choose variable to iterate on */
- if (abs(dx)>abs(dy)) {
- int dx2, dy2, cpy;
+ if (i_abs(dx) > i_abs(dy)) {
+ i_img_dim dx2, dy2, cpy;
/* sort by x */
if (x1 > x2) {
- int t;
+ i_img_dim t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
- dx = abs(dx);
+ dx = i_abs(dx);
dx2 = dx*2;
dy = y2 - y1;
i_ppix(im, x+1, y, val);
}
} else {
- int dy2, dx2, cpx;
+ i_img_dim dy2, dx2, cpx;
/* sort bx y */
if (y1 > y2) {
- int t;
+ i_img_dim t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
- dy = abs(dy);
+ dy = i_abs(dy);
dx = x2 - x1;
dy2 = dy*2;
void
-i_line_dda(i_img *im, int x1, int y1, int x2, int y2, i_color *val) {
+i_line_dda(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, i_color *val) {
- float dy;
- int x;
+ double dy;
+ i_img_dim x;
for(x=x1; x<=x2; x++) {
- dy = y1+ (x-x1)/(float)(x2-x1)*(y2-y1);
- i_ppix(im, x, (int)(dy+0.5), val);
+ dy = y1+ (x-x1)/(double)(x2-x1)*(y2-y1);
+ i_ppix(im, x, (i_img_dim)(dy+0.5), val);
}
}
+/*
+=item i_line_aa(C<im>, C<x1>, C<x2>, C<y1>, C<y2>, C<color>, C<endp>)
+=category Drawing
+Anti-alias draws a line from (x1,y1) to (x2, y2) in color.
+The point (x2, y2) is drawn only if C<endp> is set.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-void
-i_line_aa3(i_img *im,int x1,int y1,int x2,int y2,i_color *val) {
- i_color tval;
- float alpha;
- float dsec,dfrac;
- int temp,dx,dy,isec,ch;
-
- mm_log((1,"i_line_aa(im* 0x%x,x1 %d,y1 %d,x2 %d,y2 %d,val 0x%x)\n",im,x1,y1,x2,y2,val));
-
- dy=y2-y1;
- dx=x2-x1;
-
- if (abs(dx)>abs(dy)) { /* alpha < 1 */
- if (x2<x1) { temp=x1; x1=x2; x2=temp; temp=y1; y1=y2; y2=temp; }
- alpha=(float)(y2-y1)/(float)(x2-x1);
-
- dsec=y1;
- while(x1<=x2) {
- isec=(int)dsec;
- dfrac=dsec-isec;
- /* dfrac=1-(1-dfrac)*(1-dfrac); */
- /* This is something we can play with to try to get better looking lines */
-
- i_gpix(im,x1,isec,&tval);
- for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
- i_ppix(im,x1,isec,&tval);
-
- i_gpix(im,x1,isec+1,&tval);
- for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
- i_ppix(im,x1,isec+1,&tval);
-
- dsec+=alpha;
- x1++;
- }
- } else {
- if (y2<y1) { temp=y1; y1=y2; y2=temp; temp=x1; x1=x2; x2=temp; }
- alpha=(float)(x2-x1)/(float)(y2-y1);
- dsec=x1;
- while(y1<=y2) {
- isec=(int)dsec;
- dfrac=dsec-isec;
- /* dfrac=sqrt(dfrac); */
- /* This is something we can play with */
- i_gpix(im,isec,y1,&tval);
- for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)(dfrac*(float)tval.channel[ch]+(1-dfrac)*(float)val->channel[ch]);
- i_ppix(im,isec,y1,&tval);
-
- i_gpix(im,isec+1,y1,&tval);
- for(ch=0;ch<im->channels;ch++) tval.channel[ch]=(unsigned char)((1-dfrac)*(float)tval.channel[ch]+dfrac*(float)val->channel[ch]);
- i_ppix(im,isec+1,y1,&tval);
-
- dsec+=alpha;
- y1++;
- }
- }
-}
-
-
-
+=cut
+*/
void
-i_line_aa(i_img *im, int x1, int y1, int x2, int y2, i_color *val, int endp) {
- int x, y;
- int dx, dy;
- int p;
+i_line_aa(i_img *im, i_img_dim x1, i_img_dim y1, i_img_dim x2, i_img_dim y2, const i_color *val, int endp) {
+ i_img_dim x, y;
+ i_img_dim dx, dy;
+ i_img_dim p;
dx = x2 - x1;
dy = y2 - y1;
/* choose variable to iterate on */
- if (abs(dx)>abs(dy)) {
- int dx2, dy2, cpy;
+ if (i_abs(dx) > i_abs(dy)) {
+ i_img_dim dx2, dy2, cpy;
/* sort by x */
if (x1 > x2) {
- int t;
+ i_img_dim t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
- dx = abs(dx);
+ dx = i_abs(dx);
dx2 = dx*2;
dy = y2 - y1;
for(x=x1; x<x2-1; x++) {
int ch;
i_color tval;
- float t = (dy) ? -(float)(p)/(float)(dx2) : 1;
- float t1, t2;
+ double t = (dy) ? -(float)(p)/(float)(dx2) : 1;
+ double t1, t2;
if (t<0) t = 0;
t1 = 1-t;
}
}
} else {
- int dy2, dx2, cpx;
+ i_img_dim dy2, dx2, cpx;
/* sort bx y */
if (y1 > y2) {
- int t;
+ i_img_dim t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
- dy = abs(dy);
+ dy = i_abs(dy);
dx = x2 - x1;
dy2 = dy*2;
for(y=y1; y<y2-1; y++) {
int ch;
i_color tval;
- float t = (dx) ? -(float)(p)/(float)(dy2) : 1;
- float t1, t2;
+ double t = (dx) ? -(double)(p)/(double)(dy2) : 1;
+ double t1, t2;
if (t<0) t = 0;
t1 = 1-t;
i_gpix(im,x,y+1,&tval);
for(ch=0;ch<im->channels;ch++)
- tval.channel[ch]=(unsigned char)(t1*(float)tval.channel[ch]+t2*(float)val->channel[ch]);
+ tval.channel[ch]=(unsigned char)(t1*(double)tval.channel[ch]+t2*(double)val->channel[ch]);
i_ppix(im,x,y+1,&tval);
i_gpix(im,x+cpx,y+1,&tval);
for(ch=0;ch<im->channels;ch++)
- tval.channel[ch]=(unsigned char)(t2*(float)tval.channel[ch]+t1*(float)val->channel[ch]);
+ tval.channel[ch]=(unsigned char)(t2*(double)tval.channel[ch]+t1*(double)val->channel[ch]);
i_ppix(im,x+cpx,y+1,&tval);
if (p<0) {
static double
-perm(int n,int k) {
+perm(i_img_dim n,i_img_dim k) {
double r;
- int i;
+ i_img_dim i;
r=1;
for(i=k+1;i<=n;i++) r*=i;
for(i=1;i<=(n-k);i++) r/=i;
to get a new level - this may lead to errors who knows lets test it */
void
-i_bezier_multi(i_img *im,int l,double *x,double *y,i_color *val) {
+i_bezier_multi(i_img *im,int l,const double *x,const double *y, const i_color *val) {
double *bzcoef;
double t,cx,cy;
int k,i;
- int lx = 0,ly = 0;
+ i_img_dim lx = 0,ly = 0;
int n=l-1;
double itr,ccoef;
-
- bzcoef=mymalloc(sizeof(double)*l);
+ /* this is the same size as the x and y arrays, so shouldn't overflow */
+ bzcoef=mymalloc(sizeof(double)*l); /* checked 5jul05 tonyc */
for(k=0;k<l;k++) bzcoef[k]=perm(n,k);
ICL_info(val);
}
/* printf("%f -> (%d,%d)\n",t,(int)(0.5+cx),(int)(0.5+cy)); */
if (i++) {
- i_line_aa(im,lx,ly,(int)(0.5+cx),(int)(0.5+cy),val, 1);
+ i_line_aa(im,lx,ly,(i_img_dim)(0.5+cx),(i_img_dim)(0.5+cy),val, 1);
}
- /* i_ppix(im,(int)(0.5+cx),(int)(0.5+cy),val); */
- lx=(int)(0.5+cx);
- ly=(int)(0.5+cy);
+ /* i_ppix(im,(i_img_dim)(0.5+cx),(i_img_dim)(0.5+cy),val); */
+ lx=(i_img_dim)(0.5+cx);
+ ly=(i_img_dim)(0.5+cy);
}
ICL_info(val);
myfree(bzcoef);
}
-
-
-
-
-
-
-
-
-
-
/* Flood fill
REF: Graphics Gems I. page 282+
/*
struct stc {
- int mylx,myrx;
- int dadlx,dadrx;
- int myy;
+ i_img_dim mylx,myrx;
+ i_img_dim dadlx,dadrx;
+ i_img_dim myy;
int mydirection;
};
struct stack_element {
- int myLx,myRx;
- int dadLx,dadRx;
- int myY;
+ i_img_dim myLx,myRx;
+ i_img_dim dadLx,dadRx;
+ i_img_dim myY;
int myDirection;
};
static
struct stack_element*
-crdata(int left,int right,int dadl,int dadr,int y, int dir) {
+crdata(i_img_dim left,i_img_dim right,i_img_dim dadl,i_img_dim dadr,i_img_dim y, int dir) {
struct stack_element *ste;
- ste = mymalloc(sizeof(struct stack_element));
+ ste = mymalloc(sizeof(struct stack_element)); /* checked 5jul05 tonyc */
ste->myLx = left;
ste->myRx = right;
ste->dadLx = dadl;
/* i_ccomp compares two colors and gives true if they are the same */
+typedef int (*ff_cmpfunc)(i_color const *c1, i_color const *c2, int channels);
+
static int
-i_ccomp(i_color *val1,i_color *val2,int ch) {
+i_ccomp_normal(i_color const *val1, i_color const *val2, int ch) {
int i;
- for(i=0;i<ch;i++) if (val1->channel[i] !=val2->channel[i]) return 0;
+ for(i = 0; i < ch; i++)
+ if (val1->channel[i] !=val2->channel[i])
+ return 0;
return 1;
}
+static int
+i_ccomp_border(i_color const *val1, i_color const *val2, int ch) {
+ int i;
+ for(i = 0; i < ch; i++)
+ if (val1->channel[i] !=val2->channel[i])
+ return 1;
+ return 0;
+}
static int
-i_lspan(i_img *im, int seedx, int seedy, i_color *val) {
+i_lspan(i_img *im, i_img_dim seedx, i_img_dim seedy, i_color const *val, ff_cmpfunc cmpfunc) {
i_color cval;
while(1) {
if (seedx-1 < 0) break;
i_gpix(im,seedx-1,seedy,&cval);
- if (!i_ccomp(val,&cval,im->channels)) break;
+ if (!cmpfunc(val,&cval,im->channels))
+ break;
seedx--;
}
return seedx;
}
static int
-i_rspan(i_img *im, int seedx, int seedy, i_color *val) {
+i_rspan(i_img *im, i_img_dim seedx, i_img_dim seedy, i_color const *val, ff_cmpfunc cmpfunc) {
i_color cval;
while(1) {
if (seedx+1 > im->xsize-1) break;
i_gpix(im,seedx+1,seedy,&cval);
- if (!i_ccomp(val,&cval,im->channels)) break;
+ if (!cmpfunc(val,&cval,im->channels)) break;
seedx++;
}
return seedx;
}
+#ifdef DEBUG_FLOOD_FILL
+
+#define ST_PUSH_NOTE(left, right, dadl, dadr, y, dir) \
+ fprintf(stderr, "push(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
+ i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
+
+#define ST_POP_NOTE(left, right, dadl, dadr, y, dir) \
+ fprintf(stderr, "popped(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
+ i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
+
+#define ST_STACK_NOTE(dadl, dadr, left, right, y, dir) \
+ fprintf(stderr, "stack(left %" i_DF ", right %" i_DF ", dadleft %" i_DF ", dadright %" i_DF ", y %" i_DF ", dir %d, line %d)\n", \
+ i_DFc(left), i_DFc(right), i_DFc(dadl), i_DFc(dadr), i_DFc(y), (dir), __LINE__)
+
+#else
+
+#define ST_PUSH_NOTE(left, right, dadl, dadr, y, dir)
+
+#define ST_POP_NOTE(left, right, dadl, dadr, y, dir)
+
+#define ST_STACK_NOTE(dadl, dadr, left, right, y, dir)
+
+#endif
+
+
/* Macro to create a link and push on to the list */
#define ST_PUSH(left,right,dadl,dadr,y,dir) do { \
struct stack_element *s = crdata(left,right,dadl,dadr,y,dir); \
+ ST_PUSH_NOTE(left, right, dadl, dadr, y, dir); \
llist_push(st,&s); \
} while (0)
dadRx = s->dadRx; \
y = s->myY; \
direction = s->myDirection; \
+ ST_POP_NOTE(lx, rx, dadLx, dadRx, y, direction); \
myfree(s); \
} while (0)
#define ST_STACK(dir,dadLx,dadRx,lx,rx,y) do { \
- int pushrx = rx+1; \
- int pushlx = lx-1; \
+ i_img_dim pushrx = rx+1; \
+ i_img_dim pushlx = lx-1; \
+ ST_STACK_NOTE(lx, rx, dadLx, dadRx, y, dir); \
ST_PUSH(lx,rx,pushlx,pushrx,y+dir,dir); \
if (rx > dadRx) \
ST_PUSH(dadRx+1,rx,pushlx,pushrx,y-dir,-dir); \
- if (lx < dadLx) ST_PUSH(lx,dadLx-1,pushlx,pushrx,y-dir,-dir); \
+ if (lx < dadLx) \
+ ST_PUSH(lx,dadLx-1,pushlx,pushrx,y-dir,-dir); \
} while (0)
#define SET(x,y) btm_set(btm,x,y)
/* INSIDE returns true if pixel is correct color and we haven't set it before. */
-#define INSIDE(x,y) ((!btm_test(btm,x,y) && ( i_gpix(im,x,y,&cval),i_ccomp(&val,&cval,channels) ) ))
-
-
+#define INSIDE(x,y, seed) \
+ (assert((x) >= 0 && (x) < (im)->xsize && (y) >= 0 && (y) < (im)->ysize), \
+ (!btm_test(btm,x,y) && \
+ ( i_gpix(im,x,y,&cval),cmpfunc(seed,&cval,channels) ) ))
/* The function that does all the real work */
static struct i_bitmap *
-i_flood_fill_low(i_img *im,int seedx,int seedy,
- int *bxminp, int *bxmaxp, int *byminp, int *bymaxp) {
-
- /*
- int lx,rx;
- int y;
- int direction;
- int dadLx,dadRx;
- int wasIn=0;
- */
- int ltx, rtx;
- int tx = 0;
+i_flood_fill_low(i_img *im,i_img_dim seedx,i_img_dim seedy,
+ i_img_dim *bxminp, i_img_dim *bxmaxp, i_img_dim *byminp, i_img_dim *bymaxp,
+ i_color const *seed, ff_cmpfunc cmpfunc) {
+ i_img_dim ltx, rtx;
+ i_img_dim tx = 0;
- int bxmin = seedx;
- int bxmax = seedx;
- int bymin = seedy;
- int bymax = seedy;
+ i_img_dim bxmin = seedx;
+ i_img_dim bxmax = seedx;
+ i_img_dim bymin = seedy;
+ i_img_dim bymax = seedy;
struct llist *st;
struct i_bitmap *btm;
- int channels,xsize,ysize;
- i_color cval,val;
+ int channels;
+ i_img_dim xsize,ysize;
+ i_color cval; /* used by the INSIDE() macro */
channels = im->channels;
xsize = im->xsize;
btm = btm_new(xsize, ysize);
st = llist_new(100, sizeof(struct stack_element*));
- /* Get the reference color */
- i_gpix(im, seedx, seedy, &val);
-
/* Find the starting span and fill it */
- ltx = i_lspan(im, seedx, seedy, &val);
- rtx = i_rspan(im, seedx, seedy, &val);
+ ltx = i_lspan(im, seedx, seedy, seed, cmpfunc);
+ rtx = i_rspan(im, seedx, seedy, seed, cmpfunc);
for(tx=ltx; tx<=rtx; tx++) SET(tx, seedy);
+ bxmin = ltx;
+ bxmax = rtx;
ST_PUSH(ltx, rtx, ltx, rtx, seedy+1, 1);
ST_PUSH(ltx, rtx, ltx, rtx, seedy-1, -1);
while(st->count) {
/* Stack variables */
- int lx,rx;
- int dadLx,dadRx;
- int y;
+ i_img_dim lx,rx;
+ i_img_dim dadLx,dadRx;
+ i_img_dim y;
int direction;
- int x;
+ i_img_dim x;
int wasIn=0;
ST_POP(); /* sets lx, rx, dadLx, dadRx, y, direction */
x = lx+1;
- if ( lx >= 0 && (wasIn = INSIDE(lx, y)) ) {
+ if ( lx >= 0 && (wasIn = INSIDE(lx, y, seed)) ) {
SET(lx, y);
lx--;
- while(INSIDE(lx, y) && lx > 0) {
+ while(lx >= 0 && INSIDE(lx, y, seed)) {
SET(lx,y);
lx--;
}
+ /* lx should point at the left-most INSIDE() pixel */
+ ++lx;
}
if (bxmin > lx) bxmin = lx;
/* printf("x=%d\n",x); */
if (wasIn) {
- if (INSIDE(x, y)) {
+ if (INSIDE(x, y, seed)) {
/* case 1: was inside, am still inside */
SET(x,y);
} else {
}
} else {
if (x > rx) goto EXT;
- if (INSIDE(x, y)) {
+ if (INSIDE(x, y, seed)) {
SET(x, y);
/* case 3: Wasn't inside, am now: just found the start of a new run */
wasIn = 1;
return btm;
}
+/*
+=item i_flood_fill(C<im>, C<seedx>, C<seedy>, C<color>)
+
+=category Drawing
+=synopsis i_flood_fill(im, 50, 50, &color);
+Flood fills the 4-connected region starting from the point (C<seedx>,
+C<seedy>) with I<color>.
+Returns false if (C<seedx>, C<seedy>) are outside the image.
+
+=cut
+*/
undef_int
-i_flood_fill(i_img *im, int seedx, int seedy, i_color *dcol) {
- int bxmin, bxmax, bymin, bymax;
+i_flood_fill(i_img *im, i_img_dim seedx, i_img_dim seedy, const i_color *dcol) {
+ i_img_dim bxmin, bxmax, bymin, bymax;
struct i_bitmap *btm;
- int x, y;
+ i_img_dim x, y;
+ i_color val;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1, "i_flood_fill(im %p, seed(" i_DFp "), col %p)",
+ im, i_DFcp(seedx, seedy), dcol));
- i_clear_error();
+ im_clear_error(aIMCTX);
if (seedx < 0 || seedx >= im->xsize ||
seedy < 0 || seedy >= im->ysize) {
- i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
+ im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
return 0;
}
- btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
+ /* Get the reference color */
+ i_gpix(im, seedx, seedy, &val);
+
+ btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
+ &val, i_ccomp_normal);
for(y=bymin;y<=bymax;y++)
for(x=bxmin;x<=bxmax;x++)
return 1;
}
+/*
+=item i_flood_cfill(C<im>, C<seedx>, C<seedy>, C<fill>)
+
+=category Drawing
+=synopsis i_flood_cfill(im, 50, 50, fill);
+
+Flood fills the 4-connected region starting from the point (C<seedx>,
+C<seedy>) with C<fill>.
+Returns false if (C<seedx>, C<seedy>) are outside the image.
+
+=cut
+*/
undef_int
-i_flood_cfill(i_img *im, int seedx, int seedy, i_fill_t *fill) {
- int bxmin, bxmax, bymin, bymax;
+i_flood_cfill(i_img *im, i_img_dim seedx, i_img_dim seedy, i_fill_t *fill) {
+ i_img_dim bxmin, bxmax, bymin, bymax;
struct i_bitmap *btm;
- int x, y;
- int start;
+ i_color val;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1, "i_flood_cfill(im %p, seed(" i_DFp "), fill %p)",
+ im, i_DFcp(seedx, seedy), fill));
- i_clear_error();
+ im_clear_error(aIMCTX);
if (seedx < 0 || seedx >= im->xsize ||
seedy < 0 || seedy >= im->ysize) {
- i_push_error(0, "i_flood_cfill: Seed pixel outside of image");
+ im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
return 0;
}
- btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax);
-
- if (im->bits == i_8_bits && fill->fill_with_color) {
- i_color *line = mymalloc(sizeof(i_color) * (bxmax - bxmin));
- i_color *work = NULL;
- if (fill->combine)
- work = mymalloc(sizeof(i_color) * (bxmax - bxmin));
-
- for(y=bymin; y<=bymax; y++) {
- x = bxmin;
- while (x < bxmax) {
- while (x < bxmax && !btm_test(btm, x, y)) {
- ++x;
- }
- if (btm_test(btm, x, y)) {
- start = x;
- while (x < bxmax && btm_test(btm, x, y)) {
- ++x;
- }
- if (fill->combine) {
- i_glin(im, start, x, y, line);
- (fill->fill_with_color)(fill, start, y, x-start, im->channels,
- work);
- (fill->combine)(line, work, im->channels, x-start);
- }
- else {
- (fill->fill_with_color)(fill, start, y, x-start, im->channels,
- line);
- }
- i_plin(im, start, x, y, line);
- }
- }
- }
- myfree(line);
- if (work)
- myfree(work);
+ /* Get the reference color */
+ i_gpix(im, seedx, seedy, &val);
+
+ btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
+ &val, i_ccomp_normal);
+
+ cfill_from_btm(im, fill, btm, bxmin, bxmax, bymin, bymax);
+
+ btm_destroy(btm);
+ return 1;
+}
+
+/*
+=item i_flood_fill_border(C<im>, C<seedx>, C<seedy>, C<color>, C<border>)
+
+=category Drawing
+=synopsis i_flood_fill_border(im, 50, 50, &color, &border);
+
+Flood fills the 4-connected region starting from the point (C<seedx>,
+C<seedy>) with C<color>, fill stops when the fill reaches a pixels
+with color C<border>.
+
+Returns false if (C<seedx>, C<seedy>) are outside the image.
+
+=cut
+*/
+
+undef_int
+i_flood_fill_border(i_img *im, i_img_dim seedx, i_img_dim seedy, const i_color *dcol,
+ const i_color *border) {
+ i_img_dim bxmin, bxmax, bymin, bymax;
+ struct i_bitmap *btm;
+ i_img_dim x, y;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1, "i_flood_cfill(im %p, seed(" i_DFp "), dcol %p, border %p)",
+ im, i_DFcp(seedx, seedy), dcol, border));
+
+ im_clear_error(aIMCTX);
+ if (seedx < 0 || seedx >= im->xsize ||
+ seedy < 0 || seedy >= im->ysize) {
+ im_push_error(aIMCTX, 0, "i_flood_cfill: Seed pixel outside of image");
+ return 0;
}
- else {
- i_fcolor *line = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin));
- i_fcolor *work = NULL;
- if (fill->combinef)
- work = mymalloc(sizeof(i_fcolor) * (bxmax - bxmin));
-
- for(y=bymin;y<=bymax;y++) {
- x = bxmin;
- while (x < bxmax) {
- while (x < bxmax && !btm_test(btm, x, y)) {
- ++x;
- }
- if (btm_test(btm, x, y)) {
- start = x;
- while (x < bxmax && btm_test(btm, x, y)) {
- ++x;
- }
- if (fill->combinef) {
- i_glinf(im, start, x, y, line);
- (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
- work);
- (fill->combinef)(line, work, im->channels, x-start);
- }
- else {
- (fill->fill_with_fcolor)(fill, start, y, x-start, im->channels,
- line);
- }
- i_plinf(im, start, x, y, line);
- }
- }
- }
- myfree(line);
- if (work)
- myfree(work);
+
+ btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
+ border, i_ccomp_border);
+
+ for(y=bymin;y<=bymax;y++)
+ for(x=bxmin;x<=bxmax;x++)
+ if (btm_test(btm,x,y))
+ i_ppix(im,x,y,dcol);
+ btm_destroy(btm);
+ return 1;
+}
+
+/*
+=item i_flood_cfill_border(C<im>, C<seedx>, C<seedy>, C<fill>, C<border>)
+
+=category Drawing
+=synopsis i_flood_cfill_border(im, 50, 50, fill, border);
+
+Flood fills the 4-connected region starting from the point (C<seedx>,
+C<seedy>) with C<fill>, the fill stops when it reaches pixels of color
+C<border>.
+
+Returns false if (C<seedx>, C<seedy>) are outside the image.
+
+=cut
+*/
+
+undef_int
+i_flood_cfill_border(i_img *im, i_img_dim seedx, i_img_dim seedy, i_fill_t *fill,
+ const i_color *border) {
+ i_img_dim bxmin, bxmax, bymin, bymax;
+ struct i_bitmap *btm;
+ dIMCTXim(im);
+
+ im_log((aIMCTX, 1, "i_flood_cfill_border(im %p, seed(" i_DFp "), fill %p, border %p)",
+ im, i_DFcp(seedx, seedy), fill, border));
+
+ im_clear_error(aIMCTX);
+
+ if (seedx < 0 || seedx >= im->xsize ||
+ seedy < 0 || seedy >= im->ysize) {
+ im_push_error(aIMCTX, 0, "i_flood_cfill_border: Seed pixel outside of image");
+ return 0;
}
+ btm = i_flood_fill_low(im, seedx, seedy, &bxmin, &bxmax, &bymin, &bymax,
+ border, i_ccomp_border);
+
+ cfill_from_btm(im, fill, btm, bxmin, bxmax, bymin, bymax);
+
btm_destroy(btm);
+
return 1;
}
+
+static void
+cfill_from_btm(i_img *im, i_fill_t *fill, struct i_bitmap *btm,
+ i_img_dim bxmin, i_img_dim bxmax, i_img_dim bymin, i_img_dim bymax) {
+ i_img_dim x, y;
+ i_img_dim start;
+
+ i_render r;
+
+ i_render_init(&r, im, bxmax - bxmin + 1);
+
+ for(y=bymin; y<=bymax; y++) {
+ x = bxmin;
+ while (x <= bxmax) {
+ while (x <= bxmax && !btm_test(btm, x, y)) {
+ ++x;
+ }
+ if (btm_test(btm, x, y)) {
+ start = x;
+ while (x <= bxmax && btm_test(btm, x, y)) {
+ ++x;
+ }
+ i_render_fill(&r, start, y, x-start, NULL, fill);
+ }
+ }
+ }
+ i_render_done(&r);
+}
+
+/*
+=back
+
+=cut
+*/
projects / imager.git / blobdiff