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Merge parallel horizontal edges in ImagingDrawPolygon
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@ -734,7 +734,7 @@ ImagingDrawRectangle(
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int
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int
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ImagingDrawPolygon(Imaging im, int count, int *xy, const void *ink_, int fill, int op) {
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ImagingDrawPolygon(Imaging im, int count, int *xy, const void *ink_, int fill, int op) {
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int i, n;
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int i, n, x0, y0, x1, y1;
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DRAW *draw;
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DRAW *draw;
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INT32 ink;
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INT32 ink;
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@ -753,10 +753,28 @@ ImagingDrawPolygon(Imaging im, int count, int *xy, const void *ink_, int fill, i
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return -1;
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return -1;
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}
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}
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for (i = n = 0; i < count - 1; i++) {
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for (i = n = 0; i < count - 1; i++) {
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add_edge(&e[n++], xy[i + i], xy[i + i + 1], xy[i + i + 2], xy[i + i + 3]);
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x0 = xy[i * 2];
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y0 = xy[i * 2 + 1];
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x1 = xy[i * 2 + 2];
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y1 = xy[i * 2 + 3];
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if (y0 == y1 && i != 0 && y0 == xy[i * 2 - 1]) {
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// This is a horizontal line,
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// that immediately follows another horizontal line
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Edge *last_e = &e[n-1];
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if (x1 > x0 && x0 > xy[i * 2 - 2]) {
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// They are both increasing in x
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last_e->xmax = x1;
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continue;
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} else if (x1 < x0 && x0 < xy[i * 2 - 2]) {
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// They are both decreasing in x
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last_e->xmin = x1;
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continue;
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}
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}
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if (xy[i + i] != xy[0] || xy[i + i + 1] != xy[1]) {
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}
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add_edge(&e[n++], xy[i + i], xy[i + i + 1], xy[0], xy[1]);
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add_edge(&e[n++], x0, y0, x1, y1);
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}
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if (xy[i * 2] != xy[0] || xy[i * 2 + 1] != xy[1]) {
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add_edge(&e[n++], xy[i * 2], xy[i * 2 + 1], xy[0], xy[1]);
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}
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}
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draw->polygon(im, n, e, ink, 0);
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draw->polygon(im, n, e, ink, 0);
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free(e);
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free(e);
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@ -764,9 +782,9 @@ ImagingDrawPolygon(Imaging im, int count, int *xy, const void *ink_, int fill, i
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} else {
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} else {
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/* Outline */
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/* Outline */
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for (i = 0; i < count - 1; i++) {
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for (i = 0; i < count - 1; i++) {
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draw->line(im, xy[i + i], xy[i + i + 1], xy[i + i + 2], xy[i + i + 3], ink);
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draw->line(im, xy[i * 2], xy[i * 2 + 1], xy[i * 2 + 2], xy[i * 2 + 3], ink);
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}
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}
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draw->line(im, xy[i + i], xy[i + i + 1], xy[0], xy[1], ink);
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draw->line(im, xy[i * 2], xy[i * 2 + 1], xy[0], xy[1], ink);
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}
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}
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return 0;
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return 0;
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