aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--common.h6
-rw-r--r--draw_linear_bezier_reference.c156
-rw-r--r--equations.c2
-rw-r--r--lines.c4
-rw-r--r--rtgrpblib_draw_linear_bezier.c67
5 files changed, 140 insertions, 95 deletions
diff --git a/common.h b/common.h
index 80f807c..1c589be 100644
--- a/common.h
+++ b/common.h
@@ -145,12 +145,6 @@ tolerant_eq(double a, double b)
return iszeroish((a - b) / 100.0);
}
-static inline int
-intolerant_eq(double a, double b)
-{
- return fabs(a - b) < 1e-11;
-}
-
# define ASSERT(ASSERTION)\
do {\
if (!(ASSERTION)) {\
diff --git a/draw_linear_bezier_reference.c b/draw_linear_bezier_reference.c
index dbfb87f..b7dab11 100644
--- a/draw_linear_bezier_reference.c
+++ b/draw_linear_bezier_reference.c
@@ -14,86 +14,94 @@
*/
+static void
+draw_cell(RASTER *restrict raster, double x1, double y1, double x2, double y2, double dx, double dy,
+ double cxmin, double cxmax, double rxmin, double rxmax, double rymin, double rymax, ssize_t x, size_t cellY)
+{
+ double cy1, cy2, ydir = (double)SIGNUM(dy);
+ double rightedge, opposite, midadjacent;
+ size_t cell;
+
+ rightedge = cxmax;
+ cxmin = fmax(cxmin, rxmin);
+ cxmax = fmin(cxmax, rxmax);
+ cy1 = dx ? y1 + (cxmin - x1) * dy / dx : y1;
+ cy2 = dx ? y2 + (cxmax - x2) * dy / dx : y2;
+ cy1 = fmin(fmax(cy1, rymin), rymax);
+ cy2 = fmin(fmax(cy2, rymin), rymax);
+
+ opposite = ydir * fabs(cy2 - cy1);
+ midadjacent = (cxmin + cxmax) / 2.0;
+
+ if (x < 0) {
+ raster->cells[cellY].opposite_coverage += opposite;
+ raster->cells[cellY].cell_coverage += opposite;
+ } else if ((size_t)x >= raster->width) {
+ cell = cellY + (raster->width - 1);
+ raster->cells[cell].opposite_coverage += opposite;
+ } else {
+ cell = cellY + (size_t)x;
+ raster->cells[cell].opposite_coverage += opposite;
+ raster->cells[cell].cell_coverage += opposite * fabs(rightedge - midadjacent);
+ }
+}
+
void
draw_linear_bezier_reference(RASTER *restrict raster, double x1, double y1, double x2, double y2)
{
+ ssize_t iwidth = (ssize_t)raster->width;
+ double width = (double)raster->width;
+ double height = (double)raster->height;
double dx = x2 - x1;
double dy = y2 - y1;
- int xdir = SIGNUM(dx);
- int ydir = SIGNUM(dy);
- double kx = dx / dy;
- double ky = dy / dx;
- double prevX, prevY, x, y, cx, cy, h2x, h2y;
- double xfloor, yfloor;
- ssize_t cellX, cellY;
- size_t cell;
-
- prevX = x1;
- prevY = y1;
-
- for (; prevX != x2 || prevY != y2; prevX = x, prevY = y) {
- /* Find next vertical and next hozitonal grid line */
- x = xdir < 0 ? floor(prevX) : xdir > 0 ? ceil(prevX) : prevX;
- y = ydir < 0 ? floor(prevY) : ydir > 0 ? ceil(prevY) : prevY;
- x = iszeroish(x - prevX) ? x + xdir : x;
- y = iszeroish(y - prevY) ? y + ydir : y;
-
- /* Limit to the extend of the drawn line segment */
- if ((xdir < 0 && x < x2) || (xdir > 0 && x > x2))
- x = x2;
- if ((ydir < 0 && y < y2) || (ydir > 0 && y > y2))
- y = y2;
-
- /* Find next cell edge */
- if (xdir && ydir) {
- cy = y1 + (x - x1) * ky;
- cx = x1 + (y - y1) * kx;
- h2x = (cy - prevY) * (cy - prevY) + (x - prevX) * (x - prevX);
- h2y = (cx - prevX) * (cx - prevX) + (y - prevY) * (y - prevY);
- if (h2x < h2y)
- y = cy;
- else
- x = cx;
-
- /* Make sure loop will exit when we reach the end */
- if ((xdir < 0 && x <= x2) || (xdir > 0 && x >= x2) ||
- (ydir < 0 && y <= y2) || (ydir > 0 && y >= y2)) {
- x = x2;
- y = y2;
- }
+ double fymin = fmin(fmax(fmin(y1, y2), 0.0), height);
+ double fymax = fmin(fmax(fmax(y1, y2), 0.0), height);
+ double floor_fymin = floor(fymin);
+ double ceil_fymax = ceil(fymax);
+ size_t ymin = (size_t)floor_fymin;
+ size_t ymax = (size_t)ceil_fymax;
+ size_t y, cellY;
+ double rowx1, rowx2;
+ double rxmin, rxmax, floor_rxmin;
+ double rymax, rymin, ceil_rxmax;
+ ssize_t x, xmin, xmax, xmin_cropped, xmax_cropped;
+ double cxmin, cxmax;
+
+ ymax += (size_t)(ymax == ymin);
+ for (y = ymin; y < ymax; y++) {
+ rymin = (double)y;
+ rymax = (double)y + 1.0;
+ rymin = fmax(rymin, fymin);
+ rymax = fmin(rymax, fymax);
+ rowx1 = dy ? x1 + (rymin - y1) * dx / dy : x1;
+ rowx2 = dy ? x2 + (rymax - y2) * dx / dy : x2;
+ rxmin = fmin(rowx1, rowx2);
+ rxmax = fmax(rowx1, rowx2);
+ cellY = y * raster->width;
+
+ floor_rxmin = floor(rxmin);
+ ceil_rxmax = ceil(rxmax);
+ xmin = (ssize_t)floor_rxmin;
+ xmax = (ssize_t)ceil_rxmax;
+ xmax += (ssize_t)(xmax == xmin);
+ xmin_cropped = xmin;
+ xmax_cropped = xmax;
+ if (xmin < 0.0) {
+ cxmin = (double)xmin;
+ cxmax = xmax < 0 ? (double)(xmax + 1) : 0.0;
+ draw_cell(raster, x1, y1, x2, y2, dx, dy, cxmin, cxmax, rxmin, rxmax, rymin, rymax, xmin, cellY);
+ xmin_cropped = 0;
}
-
- /* Select cell to draw in */
- xfloor = xdir >= 0 ? floor(prevX) : floor(x);
- yfloor = ydir >= 0 ? floor(prevY) : floor(y);
- cellX = (ssize_t)xfloor;
- cellY = (ssize_t)yfloor;
-
- /* Do not draw if above or below the raster */
- if (cellY < 0 || (size_t)cellY >= raster->height)
- continue;
-
- if (cellX < 0) {
- /* Draw on first column in raster of outside of raster on the left side,
- * with full horizontal coverage, `.opposite_coverage` one the actual
- * cell (outside of the raster) will contribute to the first column's
- * `.cell_coverage` */
- cell = (size_t)cellY * raster->width;
- raster->cells[cell].opposite_coverage += y - prevY;
- raster->cells[cell].cell_coverage += y - prevY;
-
- } else if ((size_t)cellX >= raster->width) {
- /* If outside of the raster, on the right side, add to the last
- * columns contributions to the next column, so that the ink level
- * balances out to zero */
- cell = (size_t)cellY * raster->width + (raster->width - 1);
- raster->cells[cell].opposite_coverage += y - prevY;
-
- } else {
- /* If inside the raster, just draw the line */
- cell = (size_t)cellY * raster->width + (size_t)cellX;
- raster->cells[cell].opposite_coverage += y - prevY;
- raster->cells[cell].cell_coverage += (y - prevY) * fabs(xfloor + 1.0 - (x + prevX) / 2.0);
+ if (xmax > iwidth) {
+ cxmin = fmax(floor_rxmin, width);
+ cxmax = (double)xmax;
+ draw_cell(raster, x1, y1, x2, y2, dx, dy, cxmin, cxmax, rxmin, rxmax, rymin, rymax, (ssize_t)cxmin, cellY);
+ xmax_cropped = iwidth;
+ }
+ for (x = xmin_cropped; x < xmax_cropped; x++) {
+ cxmin = (double)x;
+ cxmax = (double)x + 1.0;
+ draw_cell(raster, x1, y1, x2, y2, dx, dy, cxmin, cxmax, rxmin, rxmax, rymin, rymax, x, cellY);
}
}
}
diff --git a/equations.c b/equations.c
index 571fc26..2cf8bc9 100644
--- a/equations.c
+++ b/equations.c
@@ -302,6 +302,8 @@ check_cubic(double r1, double i1, double r2, double i2, double r3, double i3, do
for (i = 0; i < sizeof(found) / sizeof(*found); i++)
found[i] = (i >= nexpected || expected[i] < 0.0 + TOLERANCE || expected[i] > 1.0 - TOLERANCE);
if (!nexpected) {
+ if (!ngot) /* FIXME */
+ fprintf(stderr, "%lg, %lg, %lg, %lg, %lg, %lg, %lg, %i\n", r1, i1, r2, i2, r3, i3, k, strict_real);
ASSERT(!ngot);
return;
}
diff --git a/lines.c b/lines.c
index 4ac624a..a2e87be 100644
--- a/lines.c
+++ b/lines.c
@@ -242,8 +242,8 @@ check_against_reference(double x1, double y1, double x2, double y2)
draw_linear_bezier_reference(refraster, x1, y1, x2, y2);
alarm(0);
for (i = 0; i < 100; i++) {
- ASSERT(intolerant_eq(raster->cells[i].cell_coverage, refraster->cells[i].cell_coverage));
- ASSERT(intolerant_eq(raster->cells[i].opposite_coverage, refraster->cells[i].opposite_coverage));
+ ASSERT(eq(raster->cells[i].cell_coverage, refraster->cells[i].cell_coverage));
+ ASSERT(eq(raster->cells[i].opposite_coverage, refraster->cells[i].opposite_coverage));
}
}
diff --git a/rtgrpblib_draw_linear_bezier.c b/rtgrpblib_draw_linear_bezier.c
index bf9d41e..a2af58f 100644
--- a/rtgrpblib_draw_linear_bezier.c
+++ b/rtgrpblib_draw_linear_bezier.c
@@ -127,24 +127,65 @@ static RASTER *raster;
static RASTER *refraster;
+#ifdef ROWWISE_RESET_INKLEVEL
static void
-check_draw_linear_bezier(double x1, double y1, double x2, double y2)
+draw_right_edge_shadow(double x1, double y1, double x2, double y2)
+{
+ if (raster->draftness <= 0)
+ return;
+
+ if (x1 >= 10.0 && x2 >= 10.0) {
+ draw_linear_bezier_reference(raster, x1, y1, x2, y2);
+
+ } else if (x1 >= 10.0) {
+ y2 = y2 + (10.0 - x2) * (y2 - y1) / (x2 - x1);
+ x2 = 10.0;
+ draw_linear_bezier_reference(raster, x1, y1, x2, y2);
+
+ } else if (x2 >= 10.0) {
+ y1 = y1 + (10.0 - x1) * (y2 - y1) / (x2 - x1);
+ x1 = 10.0;
+ draw_linear_bezier_reference(raster, x1, y1, x2, y2);
+ }
+}
+#endif
+
+
+static void
+proper_check_draw_linear_bezier(double x1, double y1, double x2, double y2)
{
size_t i;
+
alarm(5);
rtgrpblib_draw_linear_bezier(raster, x1, y1, x2, y2);
+#ifdef ROWWISE_RESET_INKLEVEL
+ draw_right_edge_shadow(x1, y1, x2, y2);
+#endif
+
alarm(5);
draw_linear_bezier_reference(refraster, x1, y1, x2, y2);
+
alarm(0);
+
for (i = 0; i < 100; i++) {
- ASSERT(intolerant_eq(raster->cells[i].cell_coverage, refraster->cells[i].cell_coverage));
- ASSERT(intolerant_eq(raster->cells[i].opposite_coverage, refraster->cells[i].opposite_coverage));
+ ASSERT(eq(raster->cells[i].cell_coverage, refraster->cells[i].cell_coverage));
+ ASSERT(eq(raster->cells[i].opposite_coverage, refraster->cells[i].opposite_coverage));
}
rtgrpblib_reset_raster(raster, 10, 10);
rtgrpblib_reset_raster(refraster, 10, 10);
}
+static void
+check_draw_linear_bezier(double x1, double y1, double x2, double y2)
+{
+ proper_check_draw_linear_bezier(floor(x1), floor(y1), floor(x2), floor(y2));
+ proper_check_draw_linear_bezier(floor(x1), y1, floor(x2), y2);
+ proper_check_draw_linear_bezier(x1, floor(y1), x2, floor(y2));
+ proper_check_draw_linear_bezier(x1, y1, x2, y2);
+}
+
+
static double
frand(double a, double b)
{
@@ -169,26 +210,26 @@ main(void)
ASSERT(refraster);
srand((unsigned)(uintptr_t)raster);
- for (i = 0; i < 10000UL; i++) {
-#ifndef ROWWISE_RESET_INKLEVEL
+ for (i = 0; i < 50000UL; i++) {
x1 = frand(-5, 15);
y1 = frand(-5, 15);
x2 = frand(-5, 15);
y2 = frand(-5, 15);
-#else
- /* TODO add tests the support higher upper bound */
- x1 = frand(0, 10); /* TODO fix lower bound */
- y1 = frand(-5, 15);
- x2 = frand(-5, 10);
- y2 = frand(-5, 15);
-#endif
check_draw_linear_bezier(x1, y1, x2, y2);
check_draw_linear_bezier(x1, x1, x2, x2);
+ check_draw_linear_bezier(x1, y1, x2, y1);
check_draw_linear_bezier(x1, x2, x2, x1);
+ check_draw_linear_bezier(x1, y1, x1, y2);
+ check_draw_linear_bezier(x1, x1, x1, x1);
+ raster->draftness = -1;
+ check_draw_linear_bezier(x1, y1, x2, y2);
+ check_draw_linear_bezier(x1, x1, x2, x2);
check_draw_linear_bezier(x1, y1, x2, y1);
+ check_draw_linear_bezier(x1, x2, x2, x1);
check_draw_linear_bezier(x1, y1, x1, y2);
- /* TODO test with zero draftness */
+ check_draw_linear_bezier(x1, x1, x1, x1);
+ raster->draftness = 0.5;
}
free(raster);